diff options
107 files changed, 17117 insertions, 119 deletions
@@ -453,7 +453,7 @@ export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_ve # Files to ignore in find ... statements export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ - -name CVS -o -name .pc -o -name .hg -o -name .git \) \ + -name CVS -o -name .pc -o -name .hg -o -name .git -o -name meta \) \ -prune -o export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ --exclude CVS --exclude .pc --exclude .hg --exclude .git diff --git a/arch/arm/Makefile b/arch/arm/Makefile index d1516f85f25d..8382002b3f2d 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -64,7 +64,7 @@ KBUILD_CFLAGS += $(call cc-option,-fno-ipa-sra) # macro, but instead defines a whole series of macros which makes # testing for a specific architecture or later rather impossible. arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m -arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) +arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 -march=armv7-a -Wa$(comma)-march=armv7-a arch-$(CONFIG_CPU_32v6) =-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6) # Only override the compiler option if ARMv6. The ARMv6K extensions are # always available in ARMv7 @@ -332,6 +332,9 @@ PHONY += bzImage $(BOOT_TARGETS) $(INSTALL_TARGETS) bootpImage uImage: zImage zImage: Image +# These targets cannot be built in parallel +.NOTPARALLEL: $(BOOT_TARGETS) + $(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ @$(kecho) ' Kernel: $(boot)/$@ is ready' diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile index a3af4dc08c3e..66d24d1680e2 100644 --- a/arch/arm/boot/Makefile +++ b/arch/arm/boot/Makefile @@ -68,6 +68,10 @@ $(obj)/zImage: $(obj)/compressed/vmlinux FORCE endif +ifeq ($(CONFIG_ARCH_VEXPRESS), y) +LOADADDR=0x04080000 +endif + ifneq ($(LOADADDR),) UIMAGE_LOADADDR=$(LOADADDR) else diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 0465d65d23de..08f4fcb9b3b5 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -352,7 +352,8 @@ ENTRY(\sym) */ syscall_table_start sys_call_table #define COMPAT(nr, native, compat) syscall nr, native -#ifdef CONFIG_AEABI + +#if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT) #include <calls-eabi.S> #else #include <calls-oabi.S> diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index a9ee0d9dc740..6ea05aab9ed7 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -457,8 +457,16 @@ do_translation_fault(unsigned long addr, unsigned int fsr, if (pud_none(*pud_k)) goto bad_area; - if (!pud_present(*pud)) + if (!pud_present(*pud)) { set_pud(pud, *pud_k); + /* + * There is a small window during free_pgtables() where the + * user *pud entry is 0 but the TLB has not been invalidated + * and we get a level 2 (pmd) translation fault caused by the + * intermediate TLB caching of the old level 1 (pud) entry. + */ + flush_tlb_kernel_page(addr); + } pmd = pmd_offset(pud, addr); pmd_k = pmd_offset(pud_k, addr); @@ -481,8 +489,9 @@ do_translation_fault(unsigned long addr, unsigned int fsr, #endif if (pmd_none(pmd_k[index])) goto bad_area; + if (!pmd_present(pmd[index])) + copy_pmd(pmd, pmd_k); - copy_pmd(pmd, pmd_k); return 0; bad_area: diff --git a/arch/arm/tools/gen-mach-types b/arch/arm/tools/gen-mach-types index cbe1c33bb871..cb2b69f2a39d 100644 --- a/arch/arm/tools/gen-mach-types +++ b/arch/arm/tools/gen-mach-types @@ -1,4 +1,4 @@ -#!/bin/awk +#!/usr/bin/awk # SPDX-License-Identifier: GPL-2.0 # # Awk script to generate include/generated/mach-types.h diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h index b0fd1d300154..ca6009c446f3 100644 --- a/arch/arm64/include/uapi/asm/ptrace.h +++ b/arch/arm64/include/uapi/asm/ptrace.h @@ -23,7 +23,7 @@ #include <linux/types.h> #include <asm/hwcap.h> -#include <asm/sigcontext.h> +#include <asm/sve_context.h> /* @@ -176,39 +176,36 @@ struct user_sve_header { * Additional data might be appended in the future. */ -#define SVE_PT_SVE_ZREG_SIZE(vq) SVE_SIG_ZREG_SIZE(vq) -#define SVE_PT_SVE_PREG_SIZE(vq) SVE_SIG_PREG_SIZE(vq) -#define SVE_PT_SVE_FFR_SIZE(vq) SVE_SIG_FFR_SIZE(vq) +#define SVE_PT_SVE_ZREG_SIZE(vq) __SVE_ZREG_SIZE(vq) +#define SVE_PT_SVE_PREG_SIZE(vq) __SVE_PREG_SIZE(vq) +#define SVE_PT_SVE_FFR_SIZE(vq) __SVE_FFR_SIZE(vq) #define SVE_PT_SVE_FPSR_SIZE sizeof(__u32) #define SVE_PT_SVE_FPCR_SIZE sizeof(__u32) -#define __SVE_SIG_TO_PT(offset) \ - ((offset) - SVE_SIG_REGS_OFFSET + SVE_PT_REGS_OFFSET) - #define SVE_PT_SVE_OFFSET SVE_PT_REGS_OFFSET #define SVE_PT_SVE_ZREGS_OFFSET \ - __SVE_SIG_TO_PT(SVE_SIG_ZREGS_OFFSET) + (SVE_PT_REGS_OFFSET + __SVE_ZREGS_OFFSET) #define SVE_PT_SVE_ZREG_OFFSET(vq, n) \ - __SVE_SIG_TO_PT(SVE_SIG_ZREG_OFFSET(vq, n)) + (SVE_PT_REGS_OFFSET + __SVE_ZREG_OFFSET(vq, n)) #define SVE_PT_SVE_ZREGS_SIZE(vq) \ - (SVE_PT_SVE_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_PT_SVE_ZREGS_OFFSET) + (SVE_PT_SVE_ZREG_OFFSET(vq, __SVE_NUM_ZREGS) - SVE_PT_SVE_ZREGS_OFFSET) #define SVE_PT_SVE_PREGS_OFFSET(vq) \ - __SVE_SIG_TO_PT(SVE_SIG_PREGS_OFFSET(vq)) + (SVE_PT_REGS_OFFSET + __SVE_PREGS_OFFSET(vq)) #define SVE_PT_SVE_PREG_OFFSET(vq, n) \ - __SVE_SIG_TO_PT(SVE_SIG_PREG_OFFSET(vq, n)) + (SVE_PT_REGS_OFFSET + __SVE_PREG_OFFSET(vq, n)) #define SVE_PT_SVE_PREGS_SIZE(vq) \ - (SVE_PT_SVE_PREG_OFFSET(vq, SVE_NUM_PREGS) - \ + (SVE_PT_SVE_PREG_OFFSET(vq, __SVE_NUM_PREGS) - \ SVE_PT_SVE_PREGS_OFFSET(vq)) #define SVE_PT_SVE_FFR_OFFSET(vq) \ - __SVE_SIG_TO_PT(SVE_SIG_FFR_OFFSET(vq)) + (SVE_PT_REGS_OFFSET + __SVE_FFR_OFFSET(vq)) #define SVE_PT_SVE_FPSR_OFFSET(vq) \ ((SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq) + \ - (SVE_VQ_BYTES - 1)) \ - / SVE_VQ_BYTES * SVE_VQ_BYTES) + (__SVE_VQ_BYTES - 1)) \ + / __SVE_VQ_BYTES * __SVE_VQ_BYTES) #define SVE_PT_SVE_FPCR_OFFSET(vq) \ (SVE_PT_SVE_FPSR_OFFSET(vq) + SVE_PT_SVE_FPSR_SIZE) @@ -219,8 +216,8 @@ struct user_sve_header { #define SVE_PT_SVE_SIZE(vq, flags) \ ((SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE \ - - SVE_PT_SVE_OFFSET + (SVE_VQ_BYTES - 1)) \ - / SVE_VQ_BYTES * SVE_VQ_BYTES) + - SVE_PT_SVE_OFFSET + (__SVE_VQ_BYTES - 1)) \ + / __SVE_VQ_BYTES * __SVE_VQ_BYTES) #define SVE_PT_SIZE(vq, flags) \ (((flags) & SVE_PT_REGS_MASK) == SVE_PT_REGS_SVE ? \ diff --git a/arch/arm64/include/uapi/asm/sigcontext.h b/arch/arm64/include/uapi/asm/sigcontext.h index dca8f8b5168b..5f3c0cec5af9 100644 --- a/arch/arm64/include/uapi/asm/sigcontext.h +++ b/arch/arm64/include/uapi/asm/sigcontext.h @@ -130,6 +130,8 @@ struct sve_context { #endif /* !__ASSEMBLY__ */ +#include <asm/sve_context.h> + /* * The SVE architecture leaves space for future expansion of the * vector length beyond its initial architectural limit of 2048 bits @@ -138,21 +140,20 @@ struct sve_context { * See linux/Documentation/arm64/sve.txt for a description of the VL/VQ * terminology. */ -#define SVE_VQ_BYTES 16 /* number of bytes per quadword */ +#define SVE_VQ_BYTES __SVE_VQ_BYTES /* bytes per quadword */ -#define SVE_VQ_MIN 1 -#define SVE_VQ_MAX 512 +#define SVE_VQ_MIN __SVE_VQ_MIN +#define SVE_VQ_MAX __SVE_VQ_MAX -#define SVE_VL_MIN (SVE_VQ_MIN * SVE_VQ_BYTES) -#define SVE_VL_MAX (SVE_VQ_MAX * SVE_VQ_BYTES) +#define SVE_VL_MIN __SVE_VL_MIN +#define SVE_VL_MAX __SVE_VL_MAX -#define SVE_NUM_ZREGS 32 -#define SVE_NUM_PREGS 16 +#define SVE_NUM_ZREGS __SVE_NUM_ZREGS +#define SVE_NUM_PREGS __SVE_NUM_PREGS -#define sve_vl_valid(vl) \ - ((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX) -#define sve_vq_from_vl(vl) ((vl) / SVE_VQ_BYTES) -#define sve_vl_from_vq(vq) ((vq) * SVE_VQ_BYTES) +#define sve_vl_valid(vl) __sve_vl_valid(vl) +#define sve_vq_from_vl(vl) __sve_vq_from_vl(vl) +#define sve_vl_from_vq(vq) __sve_vl_from_vq(vq) /* * If the SVE registers are currently live for the thread at signal delivery, @@ -205,34 +206,33 @@ struct sve_context { * Additional data might be appended in the future. */ -#define SVE_SIG_ZREG_SIZE(vq) ((__u32)(vq) * SVE_VQ_BYTES) -#define SVE_SIG_PREG_SIZE(vq) ((__u32)(vq) * (SVE_VQ_BYTES / 8)) -#define SVE_SIG_FFR_SIZE(vq) SVE_SIG_PREG_SIZE(vq) +#define SVE_SIG_ZREG_SIZE(vq) __SVE_ZREG_SIZE(vq) +#define SVE_SIG_PREG_SIZE(vq) __SVE_PREG_SIZE(vq) +#define SVE_SIG_FFR_SIZE(vq) __SVE_FFR_SIZE(vq) #define SVE_SIG_REGS_OFFSET \ - ((sizeof(struct sve_context) + (SVE_VQ_BYTES - 1)) \ - / SVE_VQ_BYTES * SVE_VQ_BYTES) + ((sizeof(struct sve_context) + (__SVE_VQ_BYTES - 1)) \ + / __SVE_VQ_BYTES * __SVE_VQ_BYTES) -#define SVE_SIG_ZREGS_OFFSET SVE_SIG_REGS_OFFSET +#define SVE_SIG_ZREGS_OFFSET \ + (SVE_SIG_REGS_OFFSET + __SVE_ZREGS_OFFSET) #define SVE_SIG_ZREG_OFFSET(vq, n) \ - (SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREG_SIZE(vq) * (n)) -#define SVE_SIG_ZREGS_SIZE(vq) \ - (SVE_SIG_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_SIG_ZREGS_OFFSET) + (SVE_SIG_REGS_OFFSET + __SVE_ZREG_OFFSET(vq, n)) +#define SVE_SIG_ZREGS_SIZE(vq) __SVE_ZREGS_SIZE(vq) #define SVE_SIG_PREGS_OFFSET(vq) \ - (SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREGS_SIZE(vq)) + (SVE_SIG_REGS_OFFSET + __SVE_PREGS_OFFSET(vq)) #define SVE_SIG_PREG_OFFSET(vq, n) \ - (SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREG_SIZE(vq) * (n)) -#define SVE_SIG_PREGS_SIZE(vq) \ - (SVE_SIG_PREG_OFFSET(vq, SVE_NUM_PREGS) - SVE_SIG_PREGS_OFFSET(vq)) + (SVE_SIG_REGS_OFFSET + __SVE_PREG_OFFSET(vq, n)) +#define SVE_SIG_PREGS_SIZE(vq) __SVE_PREGS_SIZE(vq) #define SVE_SIG_FFR_OFFSET(vq) \ - (SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREGS_SIZE(vq)) + (SVE_SIG_REGS_OFFSET + __SVE_FFR_OFFSET(vq)) #define SVE_SIG_REGS_SIZE(vq) \ - (SVE_SIG_FFR_OFFSET(vq) + SVE_SIG_FFR_SIZE(vq) - SVE_SIG_REGS_OFFSET) - -#define SVE_SIG_CONTEXT_SIZE(vq) (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq)) + (__SVE_FFR_OFFSET(vq) + __SVE_FFR_SIZE(vq)) +#define SVE_SIG_CONTEXT_SIZE(vq) \ + (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq)) #endif /* _UAPI__ASM_SIGCONTEXT_H */ diff --git a/arch/arm64/include/uapi/asm/sve_context.h b/arch/arm64/include/uapi/asm/sve_context.h new file mode 100644 index 000000000000..140f14c318a5 --- /dev/null +++ b/arch/arm64/include/uapi/asm/sve_context.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* Copyright (C) 2017-2018 ARM Limited */ + +#if !defined(_UAPI__ASM_PTRACE_H) && !defined(_UAPI__ASM_SIGCONTEXT_H) +#error "Do not include this header or use its definitions directly." +#endif + +#ifndef _UAPI__ASM_SVE_CONTEXT_H +#define _UAPI__ASM_SVE_CONTEXT_H + +#define __SVE_VQ_BYTES 16 /* number of bytes per quadword */ + +#define __SVE_VQ_MIN 1 +#define __SVE_VQ_MAX 512 + +#define __SVE_VL_MIN (__SVE_VQ_MIN * __SVE_VQ_BYTES) +#define __SVE_VL_MAX (__SVE_VQ_MAX * __SVE_VQ_BYTES) + +#define __SVE_NUM_ZREGS 32 +#define __SVE_NUM_PREGS 16 + +#define __sve_vl_valid(vl) \ + ((vl) % __SVE_VQ_BYTES == 0 && \ + (vl) >= __SVE_VL_MIN && \ + (vl) <= __SVE_VL_MAX) + +#define __sve_vq_from_vl(vl) ((vl) / __SVE_VQ_BYTES) +#define __sve_vl_from_vq(vq) ((vq) * __SVE_VQ_BYTES) + +#define __SVE_ZREG_SIZE(vq) ((__u32)(vq) * __SVE_VQ_BYTES) +#define __SVE_PREG_SIZE(vq) ((__u32)(vq) * (__SVE_VQ_BYTES / 8)) +#define __SVE_FFR_SIZE(vq) __SVE_PREG_SIZE(vq) + +#define __SVE_ZREGS_OFFSET 0 +#define __SVE_ZREG_OFFSET(vq, n) \ + (__SVE_ZREGS_OFFSET + __SVE_ZREG_SIZE(vq) * (n)) +#define __SVE_ZREGS_SIZE(vq) \ + (__SVE_ZREG_OFFSET(vq, __SVE_NUM_ZREGS) - __SVE_ZREGS_OFFSET) + +#define __SVE_PREGS_OFFSET(vq) \ + (__SVE_ZREGS_OFFSET + __SVE_ZREGS_SIZE(vq)) +#define __SVE_PREG_OFFSET(vq, n) \ + (__SVE_PREGS_OFFSET(vq) + __SVE_PREG_SIZE(vq) * (n)) +#define __SVE_PREGS_SIZE(vq) \ + (__SVE_PREG_OFFSET(vq, __SVE_NUM_PREGS) - __SVE_PREGS_OFFSET(vq)) + +#define __SVE_FFR_OFFSET(vq) \ + (__SVE_PREGS_OFFSET(vq) + __SVE_PREGS_SIZE(vq)) + +#endif /* ! _UAPI__ASM_SVE_CONTEXT_H */ diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index f10e1e15e1c6..7a00a8e840ad 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -124,11 +124,11 @@ obj-$(CONFIG_MIPS_CPS_PM) += pm-cps.o ifeq ($(CONFIG_CPU_MIPSR2), y) CFLAGS_DSP = -DHAVE_AS_DSP -CFLAGS_signal.o = $(CFLAGS_DSP) -CFLAGS_signal32.o = $(CFLAGS_DSP) -CFLAGS_process.o = $(CFLAGS_DSP) -CFLAGS_branch.o = $(CFLAGS_DSP) -CFLAGS_ptrace.o = $(CFLAGS_DSP) +CFLAGS_signal.o += $(CFLAGS_DSP) +CFLAGS_signal32.o += $(CFLAGS_DSP) +CFLAGS_process.o += $(CFLAGS_DSP) +CFLAGS_branch.o += $(CFLAGS_DSP) +CFLAGS_ptrace.o += $(CFLAGS_DSP) endif CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS) diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 3944c49eee0c..80d97cc250dc 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -485,6 +485,7 @@ static void __maybe_unused build_tlb_probe_entry(u32 **p) case CPU_R4700: case CPU_R5000: case CPU_NEVADA: + case CPU_4KC: uasm_i_nop(p); uasm_i_tlbp(p); break; @@ -533,6 +534,7 @@ void build_tlb_write_entry(u32 **p, struct uasm_label **l, case CPU_R4600: case CPU_R4700: + case CPU_4KC: uasm_i_nop(p); tlbw(p); uasm_i_nop(p); @@ -558,7 +560,6 @@ void build_tlb_write_entry(u32 **p, struct uasm_label **l, case CPU_R12000: case CPU_R14000: case CPU_R16000: - case CPU_4KC: case CPU_4KEC: case CPU_M14KC: case CPU_M14KEC: diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index c4c03992ee82..817cafee7a21 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -292,6 +292,9 @@ PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2) boot := arch/$(ARCH)/boot +# These targets cannot be built in parallel +.NOTPARALLEL: $(BOOT_TARGETS) + $(BOOT_TARGETS1): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) $(BOOT_TARGETS2): vmlinux @@ -406,7 +409,7 @@ endif archclean: $(Q)$(MAKE) $(clean)=$(boot) -archprepare: checkbin +archprepare: checkbin arch/powerpc/lib/crtsavres.o # Use the file '.tmp_gas_check' for binutils tests, as gas won't output # to stdout and these checks are run even on install targets. diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index eac18790d1b1..a66227548067 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -3,7 +3,9 @@ # Makefile for the linux kernel. # -CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' +CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' $(call cc-disable-warning, attribute-alias) +CFLAGS_ptrace.o += $(call cc-disable-warning, array-bounds) +CFLAGS_syscalls.o += $(call cc-disable-warning, attribute-alias) # Disable clang warning for using setjmp without setjmp.h header CFLAGS_crash.o += $(call cc-disable-warning, builtin-requires-header) diff --git a/arch/powerpc/kernel/vdso32/sigtramp.S b/arch/powerpc/kernel/vdso32/sigtramp.S index cf0c9c9c24f9..78c88af3890b 100644 --- a/arch/powerpc/kernel/vdso32/sigtramp.S +++ b/arch/powerpc/kernel/vdso32/sigtramp.S @@ -251,6 +251,40 @@ V_FUNCTION_END(__kernel_sigtramp_rt32) vsave_msr1 (31); \ vsave_msr2 (33, 32*16+12); \ vsave (32, 32*16) +#elif defined(CONFIG_SPE) +#define EH_FRAME_VMX \ + rsave (113, VREGS); \ + rsave (114, VREGS + 1*4); \ + rsave (115, VREGS + 2*4); \ + rsave (116, VREGS + 3*4); \ + rsave (117, VREGS + 4*4); \ + rsave (118, VREGS + 5*4); \ + rsave (119, VREGS + 6*4); \ + rsave (120, VREGS + 7*4); \ + rsave (121, VREGS + 8*4); \ + rsave (122, VREGS + 9*4); \ + rsave (123, VREGS + 10*4); \ + rsave (124, VREGS + 11*4); \ + rsave (125, VREGS + 12*4); \ + rsave (126, VREGS + 13*4); \ + rsave (127, VREGS + 14*4); \ + rsave (128, VREGS + 15*4); \ + rsave (129, VREGS + 16*4); \ + rsave (130, VREGS + 17*4); \ + rsave (131, VREGS + 18*4); \ + rsave (132, VREGS + 19*4); \ + rsave (133, VREGS + 20*4); \ + rsave (134, VREGS + 21*4); \ + rsave (135, VREGS + 22*4); \ + rsave (136, VREGS + 23*4); \ + rsave (137, VREGS + 24*4); \ + rsave (138, VREGS + 25*4); \ + rsave (139, VREGS + 26*4); \ + rsave (140, VREGS + 27*4); \ + rsave (141, VREGS + 28*4); \ + rsave (142, VREGS + 29*4); \ + rsave (143, VREGS + 30*4); \ + rsave (144, VREGS + 31*4); #else #define EH_FRAME_VMX #endif diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c index 2f162c6e52d4..c1a5039df5be 100644 --- a/arch/powerpc/mm/slb.c +++ b/arch/powerpc/mm/slb.c @@ -364,6 +364,7 @@ void slb_initialize(void) asm volatile("isync":::"memory"); asm volatile("slbmte %0,%0"::"r" (0) : "memory"); asm volatile("isync; slbia; isync":::"memory"); + mb(); create_shadowed_slbe(PAGE_OFFSET, mmu_kernel_ssize, lflags, LINEAR_INDEX); create_shadowed_slbe(VMALLOC_START, mmu_kernel_ssize, vflags, VMALLOC_INDEX); diff --git a/arch/sh/tools/gen-mach-types b/arch/sh/tools/gen-mach-types index 6d7c2d8eaf55..2a4a42a6d70c 100644 --- a/arch/sh/tools/gen-mach-types +++ b/arch/sh/tools/gen-mach-types @@ -1,4 +1,4 @@ -#!/bin/awk +#!/usr/bin/awk # SPDX-License-Identifier: GPL-2.0 # # Awk script to generate include/generated/machtypes.h diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 8353348ddeaf..b035cb20d502 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -295,6 +295,34 @@ __visible void do_syscall_64(unsigned long nr, struct pt_regs *regs) syscall_return_slowpath(regs); } + +#ifdef CONFIG_TRACE_IRQFLAGS +extern void trace_hardirqs_on_caller(unsigned long caller_addr); +__visible void trace_hardirqs_on_caller_cr2(unsigned long caller_addr) +{ + unsigned long address = read_cr2(); /* Get the faulting address */ + enum ctx_state prev_state; + + prev_state = exception_enter(); + trace_hardirqs_on_caller(caller_addr); + if (address != read_cr2()) + write_cr2(address); + exception_exit(prev_state); +} + +extern void trace_hardirqs_off_caller(unsigned long caller_addr); +__visible void trace_hardirqs_off_caller_cr2(unsigned long caller_addr) +{ + unsigned long address = read_cr2(); /* Get the faulting address */ + enum ctx_state prev_state; + + prev_state = exception_enter(); + trace_hardirqs_off_caller(caller_addr); + if (address != read_cr2()) + write_cr2(address); + exception_exit(prev_state); +} +#endif #endif #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index ccb5e3486aee..02702229dc54 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1317,14 +1317,14 @@ ENTRY(error_entry) * we fix gsbase, and we should do it before enter_from_user_mode * (which can take locks). */ - TRACE_IRQS_OFF + TRACE_IRQS_OFF_CR2 CALL_enter_from_user_mode ret .Lerror_entry_done_lfence: FENCE_SWAPGS_KERNEL_ENTRY .Lerror_entry_done: - TRACE_IRQS_OFF + TRACE_IRQS_OFF_CR2 ret /* diff --git a/arch/x86/entry/thunk_64.S b/arch/x86/entry/thunk_64.S index be36bf4e0957..1300b53b98cb 100644 --- a/arch/x86/entry/thunk_64.S +++ b/arch/x86/entry/thunk_64.S @@ -41,6 +41,8 @@ #ifdef CONFIG_TRACE_IRQFLAGS THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1 THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1 + THUNK trace_hardirqs_on_thunk_cr2,trace_hardirqs_on_caller_cr2,1 + THUNK trace_hardirqs_off_thunk_cr2,trace_hardirqs_off_caller_cr2,1 #endif #ifdef CONFIG_DEBUG_LOCK_ALLOC diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h index c99c66b41e53..1383e9a5d5a9 100644 --- a/arch/x86/include/asm/irqflags.h +++ b/arch/x86/include/asm/irqflags.h @@ -180,9 +180,13 @@ static inline int arch_irqs_disabled(void) #ifdef CONFIG_TRACE_IRQFLAGS # define TRACE_IRQS_ON call trace_hardirqs_on_thunk; # define TRACE_IRQS_OFF call trace_hardirqs_off_thunk; +# define TRACE_IRQS_ON_CR2 call trace_hardirqs_on_thunk_cr2; +# define TRACE_IRQS_OFF_CR2 call trace_hardirqs_off_thunk_cr2; #else # define TRACE_IRQS_ON # define TRACE_IRQS_OFF +# define TRACE_IRQS_ON_CR2 +# define TRACE_IRQS_OFF_CR2 #endif #ifdef CONFIG_DEBUG_LOCK_ALLOC # ifdef CONFIG_X86_64 diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index d805202c63cd..153407d8451f 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -21,6 +21,7 @@ * */ +#include <linux/jiffies.h> #include <linux/dmi.h> #include <linux/init.h> #include <linux/export.h> diff --git a/arch/x86/tools/gen-insn-attr-x86.awk b/arch/x86/tools/gen-insn-attr-x86.awk index a42015b305f4..1c2832e9f77d 100644 --- a/arch/x86/tools/gen-insn-attr-x86.awk +++ b/arch/x86/tools/gen-insn-attr-x86.awk @@ -1,4 +1,4 @@ -#!/bin/awk -f +#!/usr/bin/awk -f # SPDX-License-Identifier: GPL-2.0 # gen-insn-attr-x86.awk: Instruction attribute table generator # Written by Masami Hiramatsu <mhiramat@redhat.com> diff --git a/drivers/staging/octeon/ethernet-tx.c b/drivers/staging/octeon/ethernet-tx.c index df3441b815bb..386fbc4f7eb9 100644 --- a/drivers/staging/octeon/ethernet-tx.c +++ b/drivers/staging/octeon/ethernet-tx.c @@ -261,6 +261,9 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */ pko_command.s.segs = 1; pko_command.s.total_bytes = skb->len; +#if GCC_VERSION >= 80000 + barrier(); +#endif pko_command.s.size0 = CVMX_FAU_OP_SIZE_32; pko_command.s.subone0 = 1; diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c index 070c66f86e67..a57b097d7b59 100644 --- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -634,6 +634,9 @@ EXPORT_SYMBOL_GPL(usb_amd_pt_check_port); */ void uhci_reset_hc(struct pci_dev *pdev, unsigned long base) { +#ifdef CONFIG_MIPS_MALTA + int timeout = 10; +#endif /* Turn off PIRQ enable and SMI enable. (This also turns off the * BIOS's USB Legacy Support.) Turn off all the R/WC bits too. */ @@ -647,9 +650,16 @@ void uhci_reset_hc(struct pci_dev *pdev, unsigned long base) outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD); mb(); udelay(5); - if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET) - dev_warn(&pdev->dev, "HCRESET not completed yet!\n"); +#ifdef CONFIG_MIPS_MALTA + while (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET) { + if (--timeout < 0) { + dev_warn(&pdev->dev, "HCRESET timed out!\n"); + break; + } + udelay(5); + } +#endif /* Just to be safe, disable interrupt requests and * make sure the controller is stopped. */ diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c index 35fcb826152c..1cd2808eb455 100644 --- a/drivers/usb/host/uhci-q.c +++ b/drivers/usb/host/uhci-q.c @@ -72,7 +72,9 @@ static void uhci_fsbr_off(struct uhci_hcd *uhci) static void uhci_add_fsbr(struct uhci_hcd *uhci, struct urb *urb) { struct urb_priv *urbp = urb->hcpriv; - +#ifdef CONFIG_MIPS_MALTA + return; +#endif urbp->fsbr = 1; } diff --git a/drivers/video/fbdev/uvesafb.c b/drivers/video/fbdev/uvesafb.c index 440a6636d8f0..2dee073b21ad 100644 --- a/drivers/video/fbdev/uvesafb.c +++ b/drivers/video/fbdev/uvesafb.c @@ -43,6 +43,7 @@ static const struct fb_fix_screeninfo uvesafb_fix = { .visual = FB_VISUAL_TRUECOLOR, }; +static int task_timeout = UVESAFB_TIMEOUT; /* timeout [ms] of task execution */ static int mtrr = 3; /* enable mtrr by default */ static bool blank = 1; /* enable blanking by default */ static int ypan = 1; /* 0: scroll, 1: ypan, 2: ywrap */ @@ -146,7 +147,9 @@ static int uvesafb_exec(struct uvesafb_ktask *task) struct cn_msg *m; int err; int len = sizeof(task->t) + task->t.buf_len; - + int forever_wait = task_timeout < 0 ? 1 : 0; + /* For infinite wait case, set interval to the legacy 5000 ms */ + int timeout = forever_wait ? 5000 : task_timeout; /* * Check whether the message isn't longer than the maximum * allowed by connector. @@ -212,9 +215,21 @@ static int uvesafb_exec(struct uvesafb_ktask *task) } else if (err == -ENOBUFS) err = 0; - if (!err && !(task->t.flags & TF_EXIT)) - err = !wait_for_completion_timeout(task->done, - msecs_to_jiffies(UVESAFB_TIMEOUT)); + if (!err && !(task->t.flags & TF_EXIT)) { + do { + err = !wait_for_completion_timeout(task->done, + msecs_to_jiffies(timeout)); + if (err) + printk_ratelimited( + KERN_WARNING + "uvesafb: %u ms task timeout%s\n", + timeout, + forever_wait ? + ", infinitely waiting." : "."); + else + break; + } while (forever_wait); + } mutex_lock(&uvfb_lock); uvfb_tasks[seq] = NULL; @@ -1816,6 +1831,8 @@ static int uvesafb_setup(char *options) while ((this_opt = strsep(&options, ",")) != NULL) { if (!*this_opt) continue; + if (!strncmp(this_opt, "task_timeout", 12)) + task_timeout = simple_strtol(this_opt+12, NULL, 0); if (!strcmp(this_opt, "redraw")) ypan = 0; else if (!strcmp(this_opt, "ypan")) @@ -1959,6 +1976,9 @@ static const struct kernel_param_ops param_ops_scroll = { }; #define param_check_scroll(name, p) __param_check(name, p, void) +module_param(task_timeout, int, 0400); +MODULE_PARM_DESC(task_timeout, + "Timeout [ms] of a task's completion, or set to any negative value to infinitely wait"); module_param_named(scroll, ypan, scroll, 0); MODULE_PARM_DESC(scroll, "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'"); diff --git a/fs/Kconfig b/fs/Kconfig index ac474a61be37..73707d287cdb 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -239,6 +239,7 @@ source "fs/hfsplus/Kconfig" source "fs/befs/Kconfig" source "fs/bfs/Kconfig" source "fs/efs/Kconfig" +source "fs/yaffs2/Kconfig" source "fs/jffs2/Kconfig" # UBIFS File system configuration source "fs/ubifs/Kconfig" diff --git a/fs/Makefile b/fs/Makefile index 293733f61594..ca6125945a3b 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -128,3 +128,4 @@ obj-y += exofs/ # Multiple modules obj-$(CONFIG_CEPH_FS) += ceph/ obj-$(CONFIG_PSTORE) += pstore/ obj-$(CONFIG_EFIVAR_FS) += efivarfs/ +obj-$(CONFIG_YAFFS_FS) += yaffs2/ diff --git a/fs/fat/Kconfig b/fs/fat/Kconfig index 3ff1772f612e..ca5c78bda750 100644 --- a/fs/fat/Kconfig +++ b/fs/fat/Kconfig @@ -74,6 +74,27 @@ config VFAT_FS To compile this as a module, choose M here: the module will be called vfat. +config VFAT_FS_NO_DUALNAMES + bool "disable VFAT dual names support (patent workaround)" + depends on VFAT_FS + help + This option disables support for dual filenames on VFAT filesystems. + If this option is enabled then file creation will either put + a short (8.3) name or a long name on the file, but never both. + The field where a shortname would normally go is filled with + invalid characters such that it cannot be considered a valid + short filename. + + That means that long filenames created with this option + disabled will not be accessible at all to operating systems + that do not understand the FAT long filename extensions. + + Users considering disabling this option should consider the + implications of any patents that may exist on dual filenames + in VFAT. + + If unsure, say N + config FAT_DEFAULT_CODEPAGE int "Default codepage for FAT" depends on MSDOS_FS || VFAT_FS @@ -100,6 +121,17 @@ config FAT_DEFAULT_IOCHARSET Enable any character sets you need in File Systems/Native Language Support. +config VFAT_NO_CREATE_WITH_LONGNAMES + bool "Disable creating files with long names" + depends on VFAT_FS + default n + help + Set this to disable support for creating files or directories with + names longer than 8.3 (the original DOS maximum file name length) + e.g. naming a file FILE1234.TXT would be allowed but creating or + renaming a file to FILE12345.TXT or FILE1234.TEXT would not + be permitted. Reading files with long file names is still permitted. + config FAT_DEFAULT_UTF8 bool "Enable FAT UTF-8 option by default" depends on VFAT_FS diff --git a/fs/fat/dir.c b/fs/fat/dir.c index de60c05c0ca1..397f95b65881 100644 --- a/fs/fat/dir.c +++ b/fs/fat/dir.c @@ -368,7 +368,8 @@ static int fat_parse_short(struct super_block *sb, dotoffset = 1; } - memcpy(work, de->name, sizeof(work)); + memcpy(work, de->name, sizeof(de->name)); + /* see namei.c, msdos_format_name */ if (work[0] == 0x05) work[0] = 0xE5; @@ -498,6 +499,13 @@ parse_record: goto end_of_dir; } + /* + * The FAT_NO_83NAME flag is used to mark files + * created with no 8.3 short name + */ + if (de->lcase & FAT_NO_83NAME) + goto compare_longname; + /* Never prepend '.' to hidden files here. * That is done only for msdos mounts (and only when * 'dotsOK=yes'); if we are executing here, it is in the @@ -511,6 +519,7 @@ parse_record: if (fat_name_match(sbi, name, name_len, bufname, len)) goto found; +compare_longname: if (nr_slots) { void *longname = unicode + FAT_MAX_UNI_CHARS; int size = PATH_MAX - FAT_MAX_UNI_SIZE; @@ -602,6 +611,8 @@ parse_record: if (de->attr != ATTR_EXT && IS_FREE(de->name)) goto record_end; } else { + if (de->lcase & FAT_NO_83NAME) + goto record_end; if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) goto record_end; } @@ -960,6 +971,10 @@ int fat_scan(struct inode *dir, const unsigned char *name, sinfo->bh = NULL; while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, &sinfo->de) >= 0) { + /* skip files marked as having no 8.3 short name */ + if (sinfo->de->lcase & FAT_NO_83NAME) + continue; + if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { sinfo->slot_off -= sizeof(*sinfo->de); sinfo->nr_slots = 1; diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c index 82cd1e69cbdf..b006e3c9ef89 100644 --- a/fs/fat/namei_vfat.c +++ b/fs/fat/namei_vfat.c @@ -21,6 +21,7 @@ #include <linux/namei.h> #include <linux/kernel.h> #include <linux/iversion.h> +#include <linux/random.h> #include "fat.h" static inline unsigned long vfat_d_version(struct dentry *dentry) @@ -335,6 +336,17 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen; int is_shortname; struct shortname_info base_info, ext_info; + unsigned opts_shortname = opts->shortname; + +#ifdef CONFIG_VFAT_FS_NO_DUALNAMES + /* + * When we do not have dualnames, we want to maximise the + * chance that a file will be able to be represented with just + * a 8.3 entry. We can do that by using the WINNT case + * handling extensions to FAT. + */ + opts_shortname = VFAT_SFN_CREATE_WINNT; +#endif is_shortname = 1; INIT_SHORTNAME_INFO(&base_info); @@ -443,13 +455,22 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, memcpy(name_res, base, baselen); memcpy(name_res + 8, ext, extlen); *lcase = 0; + +#ifdef CONFIG_VFAT_NO_CREATE_WITH_LONGNAMES + if (is_shortname == 0) + return -ENAMETOOLONG; + if (!base_info.valid || !ext_info.valid) + return -EINVAL; + opts_shortname = VFAT_SFN_CREATE_WINNT; +#endif + if (is_shortname && base_info.valid && ext_info.valid) { if (vfat_find_form(dir, name_res) == 0) return -EEXIST; - if (opts->shortname & VFAT_SFN_CREATE_WIN95) { + if (opts_shortname & VFAT_SFN_CREATE_WIN95) { return (base_info.upper && ext_info.upper); - } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) { + } else if (opts_shortname & VFAT_SFN_CREATE_WINNT) { if ((base_info.upper || base_info.lower) && (ext_info.upper || ext_info.lower)) { if (!base_info.upper && base_info.lower) @@ -575,6 +596,66 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname, return 0; } +#ifdef CONFIG_VFAT_FS_NO_DUALNAMES +/* + * This function creates a dummy 8.3 entry which is as compatible as + * possible with existing FAT devices, while not being a valid + * filename under windows or Linux + */ +static void vfat_build_dummy_83_buffer(struct inode *dir, char *msdos_name, + int is_dir) +{ + /* + * These characters are all invalid in 8.3 names, plus have + * been shown to be harmless on all tested devices + */ + const char invalidchar[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x0B, + 0x0C, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, + 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, + 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x22, 0x2a, + 0x3a, 0x3c, 0x3e, 0x3f, 0x5b, 0x5d, 0x7c }; + int i, tilde_pos, slash_pos; + u32 rand_num = prandom_u32(); + + /* We need a '~' in the prefix to make Win98 happy. */ + tilde_pos = rand_num % 8; + rand_num >>= 3; + + /* + * the '/' makes sure that even unpatched Linux systems can't + * get at files by the 8.3 entry. Don't put in a / in + * directories as it can cause problems with some + * photo frames + */ + if (is_dir) + slash_pos = -1; + else { + slash_pos = (tilde_pos + 1 + rand_num % 7) % 8; + rand_num >>= 3; + } + + /* + * fill in the first 8 bytes with invalid characters. Note + * that we need to be careful not to run out of randomness. We + * leave the 3 byte extension in place as some cheap MP3 + * players need them. + */ + for (i = 0; i < 8; i++) { + if (i == tilde_pos) + msdos_name[i] = '~'; + else if (i == slash_pos) + msdos_name[i] = '/'; + else { + msdos_name[i] = + invalidchar[rand_num % sizeof(invalidchar)]; + rand_num /= sizeof(invalidchar); + if (rand_num < sizeof(invalidchar)) + rand_num = prandom_u32(); + } + } +} +#endif + static int vfat_build_slots(struct inode *dir, const unsigned char *name, int len, int is_dir, int cluster, struct timespec64 *ts, @@ -582,15 +663,19 @@ static int vfat_build_slots(struct inode *dir, const unsigned char *name, { struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); struct fat_mount_options *opts = &sbi->options; - struct msdos_dir_slot *ps; struct msdos_dir_entry *de; - unsigned char cksum, lcase; + unsigned char lcase; unsigned char msdos_name[MSDOS_NAME]; wchar_t *uname; __le16 time, date; u8 time_cs; - int err, ulen, usize, i; + int err, ulen, usize; +#ifndef CONFIG_VFAT_NO_CREATE_WITH_LONGNAMES + int i; + struct msdos_dir_slot *ps; + unsigned char cksum; loff_t offset; +#endif *nr_slots = 0; @@ -617,6 +702,16 @@ static int vfat_build_slots(struct inode *dir, const unsigned char *name, goto shortname; } +#ifdef CONFIG_VFAT_FS_NO_DUALNAMES + printk_once(KERN_INFO + "VFAT: not creating 8.3 short filenames for long names\n"); + vfat_build_dummy_83_buffer(dir, msdos_name, is_dir); + lcase = FAT_NO_83NAME; +#endif + +#ifdef CONFIG_VFAT_NO_CREATE_WITH_LONGNAMES + de = (struct msdos_dir_entry *)slots; +#else /* build the entry of long file name */ cksum = fat_checksum(msdos_name); @@ -634,6 +729,7 @@ static int vfat_build_slots(struct inode *dir, const unsigned char *name, } slots[0].id |= 0x40; de = (struct msdos_dir_entry *)ps; +#endif shortname: /* build the entry of 8.3 alias name */ @@ -1057,7 +1153,11 @@ static struct dentry *vfat_mount(struct file_system_type *fs_type, static struct file_system_type vfat_fs_type = { .owner = THIS_MODULE, +#ifdef CONFIG_VFAT_NO_CREATE_WITH_LONGNAMES + .name = "lfat", +#else .name = "vfat", +#endif .mount = vfat_mount, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, @@ -1077,6 +1177,9 @@ static void __exit exit_vfat_fs(void) MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("VFAT filesystem support"); MODULE_AUTHOR("Gordon Chaffee"); +#ifdef CONFIG_VFAT_NO_CREATE_WITH_LONGNAMES +MODULE_ALIAS("lfat"); +#endif module_init(init_vfat_fs) module_exit(exit_vfat_fs) diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig index 5f93cfacb3d1..73135eb5d0ae 100644 --- a/fs/nfs/Kconfig +++ b/fs/nfs/Kconfig @@ -39,6 +39,19 @@ config NFS_V2 If unsure, say Y. +config NFS_DEF_FILE_IO_SIZE + int "Default size for NFS I/O read and write at runtime" + depends on NFS_FS + default "4096" + help + To change the default rsize and wsize supported by the NFS client, + adjust NFS_DEF_FILE_IO_SIZE. 64KB is a typical maximum, but some + servers can support a megabyte or more. The default is left at 4096 + bytes, which is reasonable for NFS over UDP, however, for some + systems, setting a smaller value like 1024 can work around + limitations in the driver or hardware and result in overall + improved performance. + config NFS_V3 tristate "NFS client support for NFS version 3" depends on NFS_FS diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 0a2b59c1ecb3..fecd0027ead5 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -9,7 +9,6 @@ * 2 of the License, or (at your option) any later version. */ - #include <linux/module.h> #include <linux/init.h> #include <linux/sched.h> @@ -70,7 +69,7 @@ static const struct rpc_version *nfs_version[5] = { [4] = NULL, }; -const struct rpc_program nfs_program = { +struct rpc_program nfs_program = { .name = "nfs", .number = NFS_PROGRAM, .nrvers = ARRAY_SIZE(nfs_version), @@ -162,6 +161,7 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) goto error_dealloc; clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; + clp->nfs_prog = cl_init->nfs_prog; refcount_set(&clp->cl_count, 1); clp->cl_cons_state = NFS_CS_INITING; @@ -320,6 +320,9 @@ again: /* Match nfsv4 minorversion */ if (clp->cl_minorversion != data->minorversion) continue; + if (clp->nfs_prog != data->nfs_prog) + continue; + /* Match the full socket address */ if (!rpc_cmp_addr_port(sap, clap)) /* Match all xprt_switch full socket addresses */ @@ -525,6 +528,10 @@ int nfs_create_rpc_client(struct nfs_client *clp, if (!IS_ERR(clp->cl_rpcclient)) return 0; + if (clp->nfs_prog) + nfs_program.number = clp->nfs_prog; + else + nfs_program.number = NFS_PROGRAM; clnt = rpc_create(&args); if (IS_ERR(clnt)) { dprintk("%s: cannot create RPC client. Error = %ld\n", @@ -662,6 +669,7 @@ static int nfs_init_server(struct nfs_server *server, .proto = data->nfs_server.protocol, .net = data->net, .timeparms = &timeparms, + .nfs_prog = data->nfs_prog, }; struct nfs_client *clp; int error; diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 8357ff69962f..a97b081ab843 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -83,6 +83,7 @@ struct nfs_client_initdata { u32 minorversion; struct net *net; const struct rpc_timeout *timeparms; + int nfs_prog; }; /* @@ -94,6 +95,8 @@ struct nfs_parsed_mount_data { unsigned int timeo, retrans; unsigned int acregmin, acregmax, acdirmin, acdirmax; + int nfs_prog; + int mount_prog; unsigned int namlen; unsigned int options; unsigned int bsize; @@ -150,11 +153,11 @@ struct nfs_mount_info { struct nfs_fh *mntfh; }; -extern int nfs_mount(struct nfs_mount_request *info); +extern int nfs_mount(struct nfs_mount_request *info, int prog); extern void nfs_umount(const struct nfs_mount_request *info); /* client.c */ -extern const struct rpc_program nfs_program; +extern struct rpc_program nfs_program; extern void nfs_clients_init(struct net *net); extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c index d979ff4fee7e..7035dc1797c2 100644 --- a/fs/nfs/mount_clnt.c +++ b/fs/nfs/mount_clnt.c @@ -66,7 +66,7 @@ enum { MOUNTPROC3_EXPORT = 5, }; -static const struct rpc_program mnt_program; +static struct rpc_program mnt_program; /* * Defined by OpenGroup XNFS Version 3W, chapter 8 @@ -143,7 +143,7 @@ struct mnt_fhstatus { * with the list from the server or a faked-up list if the server didn't * provide one. */ -int nfs_mount(struct nfs_mount_request *info) +int nfs_mount(struct nfs_mount_request *info, int m_prog) { struct mountres result = { .fh = info->fh, @@ -177,6 +177,7 @@ int nfs_mount(struct nfs_mount_request *info) if (info->noresvport) args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; + mnt_program.number = m_prog; mnt_clnt = rpc_create(&args); if (IS_ERR(mnt_clnt)) goto out_clnt_err; @@ -530,7 +531,7 @@ static const struct rpc_version *mnt_version[] = { static struct rpc_stat mnt_stats; -static const struct rpc_program mnt_program = { +static struct rpc_program mnt_program = { .name = "mount", .number = NFS_MNT_PROGRAM, .nrvers = ARRAY_SIZE(mnt_version), diff --git a/fs/nfs/super.c b/fs/nfs/super.c index d90efdea9fbd..6172d4125a11 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -102,6 +102,8 @@ enum { Opt_mountport, Opt_mountvers, Opt_minorversion, + Opt_mountprog, + Opt_nfsprog, /* Mount options that take string arguments */ Opt_nfsvers, @@ -167,6 +169,8 @@ static const match_table_t nfs_mount_option_tokens = { { Opt_mountport, "mountport=%s" }, { Opt_mountvers, "mountvers=%s" }, { Opt_minorversion, "minorversion=%s" }, + { Opt_mountprog, "mountprog=%s" }, + { Opt_nfsprog, "nfsprog=%s" }, { Opt_nfsvers, "nfsvers=%s" }, { Opt_nfsvers, "vers=%s" }, @@ -922,6 +926,8 @@ static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) data->acregmax = NFS_DEF_ACREGMAX; data->acdirmin = NFS_DEF_ACDIRMIN; data->acdirmax = NFS_DEF_ACDIRMAX; + data->nfs_prog = NFS_PROGRAM; + data->mount_prog = NFS_MNT_PROGRAM; data->mount_server.port = NFS_UNSPEC_PORT; data->nfs_server.port = NFS_UNSPEC_PORT; data->nfs_server.protocol = XPRT_TRANSPORT_TCP; @@ -1389,6 +1395,26 @@ static int nfs_parse_mount_options(char *raw, goto out_invalid_value; mnt->acdirmax = option; break; + case Opt_mountprog: + string = match_strdup(args); + if (string == NULL) + goto out_nomem; + rc = kstrtoul(string, 10, &option); + kfree(string); + if (rc != 0) + goto out_invalid_value; + mnt->mount_prog = option; + break; + case Opt_nfsprog: + string = match_strdup(args); + if (string == NULL) + goto out_nomem; + rc = kstrtoul(string, 10, &option); + kfree(string); + if (rc != 0) + goto out_invalid_value; + mnt->nfs_prog = option; + break; case Opt_actimeo: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; @@ -1789,7 +1815,7 @@ static int nfs_request_mount(struct nfs_parsed_mount_data *args, * Now ask the mount server to map our export path * to a file handle. */ - status = nfs_mount(&request); + status = nfs_mount(&request,args->mount_prog); if (status != 0) { dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", request.hostname, status); @@ -2103,6 +2129,9 @@ static int nfs23_validate_mount_data(void *options, } break; + case 7: + args->nfs_prog = (data->version >= 7) ? data->nfs_prog : NFS_PROGRAM; + break; default: return NFS_TEXT_DATA; } @@ -2165,6 +2194,7 @@ static int nfs_validate_text_mount_data(void *options, int max_namelen = PAGE_SIZE; int max_pathlen = NFS_MAXPATHLEN; struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; + args->nfs_prog = NFS_PROGRAM; if (nfs_parse_mount_options((char *)options, args) == 0) return -EINVAL; @@ -2784,6 +2814,8 @@ static int nfs4_validate_mount_data(void *options, args->version = 4; + args->nfs_prog = NFS_PROGRAM; + switch (data->version) { case 1: if (data->host_addrlen > sizeof(args->nfs_server.address)) diff --git a/fs/yaffs2/Kconfig b/fs/yaffs2/Kconfig new file mode 100644 index 000000000000..408570fc7a5e --- /dev/null +++ b/fs/yaffs2/Kconfig @@ -0,0 +1,171 @@ +# +# yaffs file system configurations +# + +config YAFFS_FS + tristate "yaffs2 file system support" + default n + depends on MTD_BLOCK + select YAFFS_YAFFS1 + select YAFFS_YAFFS2 + help + yaffs2, or Yet Another Flash File System, is a file system + optimised for NAND Flash chips. + + To compile the yaffs2 file system support as a module, choose M + here: the module will be called yaffs2. + + If unsure, say N. + + Further information on yaffs2 is available at + <http://www.aleph1.co.uk/yaffs/>. + +config YAFFS_YAFFS1 + bool "512 byte / page devices" + depends on YAFFS_FS + default y + help + Enable yaffs1 support -- yaffs for 512 byte / page devices + + Not needed for 2K-page devices. + + If unsure, say Y. + +config YAFFS_9BYTE_TAGS + bool "Use older-style on-NAND data format with pageStatus byte" + depends on YAFFS_YAFFS1 + default n + help + + Older-style on-NAND data format has a "pageStatus" byte to record + chunk/page state. This byte is zero when the page is discarded. + Choose this option if you have existing on-NAND data using this + format that you need to continue to support. New data written + also uses the older-style format. Note: Use of this option + generally requires that MTD's oob layout be adjusted to use the + older-style format. See notes on tags formats and MTD versions + in yaffs_mtdif1.c. + + If unsure, say N. + +config YAFFS_DOES_ECC + bool "Lets yaffs do its own ECC" + depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS + default n + help + This enables yaffs to use its own ECC functions instead of using + the ones from the generic MTD-NAND driver. + + If unsure, say N. + +config YAFFS_ECC_WRONG_ORDER + bool "Use the same ecc byte order as Steven Hill's nand_ecc.c" + depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS + default n + help + This makes yaffs_ecc.c use the same ecc byte order as Steven + Hill's nand_ecc.c. If not set, then you get the same ecc byte + order as SmartMedia. + + If unsure, say N. + +config YAFFS_YAFFS2 + bool "2048 byte (or larger) / page devices" + depends on YAFFS_FS + default y + help + Enable yaffs2 support -- yaffs for >= 2K bytes per page devices + + If unsure, say Y. + +config YAFFS_AUTO_YAFFS2 + bool "Autoselect yaffs2 format" + depends on YAFFS_YAFFS2 + default y + help + Without this, you need to explicitely use yaffs2 as the file + system type. With this, you can say "yaffs" and yaffs or yaffs2 + will be used depending on the device page size (yaffs on + 512-byte page devices, yaffs2 on 2K page devices). + + If unsure, say Y. + +config YAFFS_DISABLE_TAGS_ECC + bool "Disable yaffs from doing ECC on tags by default" + depends on YAFFS_FS && YAFFS_YAFFS2 + default n + help + This defaults yaffs to using its own ECC calculations on tags instead of + just relying on the MTD. + This behavior can also be overridden with tags_ecc_on and + tags_ecc_off mount options. + + If unsure, say N. + +config YAFFS_ALWAYS_CHECK_CHUNK_ERASED + bool "Force chunk erase check" + depends on YAFFS_FS + default n + help + Normally yaffs only checks chunks before writing until an erased + chunk is found. This helps to detect any partially written + chunks that might have happened due to power loss. + + Enabling this forces on the test that chunks are erased in flash + before writing to them. This takes more time but is potentially + a bit more secure. + + Suggest setting Y during development and ironing out driver + issues etc. Suggest setting to N if you want faster writing. + + If unsure, say Y. + +config YAFFS_EMPTY_LOST_AND_FOUND + bool "Empty lost and found on boot" + depends on YAFFS_FS + default n + help + If this is enabled then the contents of lost and found is + automatically dumped at mount. + + If unsure, say N. + +config YAFFS_DISABLE_BLOCK_REFRESHING + bool "Disable yaffs2 block refreshing" + depends on YAFFS_FS + default n + help + If this is set, then block refreshing is disabled. + Block refreshing infrequently refreshes the oldest block in + a yaffs2 file system. This mechanism helps to refresh flash to + mitigate against data loss. This is particularly useful for MLC. + + If unsure, say N. + +config YAFFS_DISABLE_BACKGROUND + bool "Disable yaffs2 background processing" + depends on YAFFS_FS + default n + help + If this is set, then background processing is disabled. + Background processing makes many foreground activities faster. + + If unsure, say N. + +config YAFFS_DISABLE_BAD_BLOCK_MARKING + bool "Disable yaffs2 bad block marking" + depends on YAFFS_FS + default n + help + Useful during early flash bring up to prevent problems causing + lots of bad block marking. + + If unsure, say N. + +config YAFFS_XATTR + bool "Enable yaffs2 xattr support" + depends on YAFFS_FS + default y + help + If this is set then yaffs2 will provide xattr support. + If unsure, say Y. diff --git a/fs/yaffs2/Makefile b/fs/yaffs2/Makefile new file mode 100644 index 000000000000..f9a9fb1bfdd4 --- /dev/null +++ b/fs/yaffs2/Makefile @@ -0,0 +1,18 @@ +# +# Makefile for the linux YAFFS filesystem routines. +# + +obj-$(CONFIG_YAFFS_FS) += yaffs.o + +yaffs-y := yaffs_ecc.o yaffs_vfs.o yaffs_guts.o yaffs_checkptrw.o +yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o +yaffs-y += yaffs_tagscompat.o yaffs_tagsmarshall.o +yaffs-y += yaffs_mtdif.o +yaffs-y += yaffs_nameval.o yaffs_attribs.o +yaffs-y += yaffs_allocator.o +yaffs-y += yaffs_yaffs1.o +yaffs-y += yaffs_yaffs2.o +yaffs-y += yaffs_bitmap.o +yaffs-y += yaffs_summary.o +yaffs-y += yaffs_verify.o + diff --git a/fs/yaffs2/yaffs_allocator.c b/fs/yaffs2/yaffs_allocator.c new file mode 100644 index 000000000000..c8f2861c53ee --- /dev/null +++ b/fs/yaffs2/yaffs_allocator.c @@ -0,0 +1,357 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_allocator.h" +#include "yaffs_guts.h" +#include "yaffs_trace.h" +#include "yportenv.h" + +/* + * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks + * of approx 100 objects that are themn allocated singly. + * This is basically a simplified slab allocator. + * + * We don't use the Linux slab allocator because slab does not allow + * us to dump all the objects in one hit when we do a umount and tear + * down all the tnodes and objects. slab requires that we first free + * the individual objects. + * + * Once yaffs has been mainlined I shall try to motivate for a change + * to slab to provide the extra features we need here. + */ + +struct yaffs_tnode_list { + struct yaffs_tnode_list *next; + struct yaffs_tnode *tnodes; +}; + +struct yaffs_obj_list { + struct yaffs_obj_list *next; + struct yaffs_obj *objects; +}; + +struct yaffs_allocator { + int n_tnodes_created; + struct yaffs_tnode *free_tnodes; + int n_free_tnodes; + struct yaffs_tnode_list *alloc_tnode_list; + + int n_obj_created; + struct list_head free_objs; + int n_free_objects; + + struct yaffs_obj_list *allocated_obj_list; +}; + +static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev) +{ + struct yaffs_allocator *allocator = + (struct yaffs_allocator *)dev->allocator; + struct yaffs_tnode_list *tmp; + + if (!allocator) { + BUG(); + return; + } + + while (allocator->alloc_tnode_list) { + tmp = allocator->alloc_tnode_list->next; + + kfree(allocator->alloc_tnode_list->tnodes); + kfree(allocator->alloc_tnode_list); + allocator->alloc_tnode_list = tmp; + } + + allocator->free_tnodes = NULL; + allocator->n_free_tnodes = 0; + allocator->n_tnodes_created = 0; +} + +static void yaffs_init_raw_tnodes(struct yaffs_dev *dev) +{ + struct yaffs_allocator *allocator = dev->allocator; + + if (!allocator) { + BUG(); + return; + } + + allocator->alloc_tnode_list = NULL; + allocator->free_tnodes = NULL; + allocator->n_free_tnodes = 0; + allocator->n_tnodes_created = 0; +} + +static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes) +{ + struct yaffs_allocator *allocator = + (struct yaffs_allocator *)dev->allocator; + int i; + struct yaffs_tnode *new_tnodes; + u8 *mem; + struct yaffs_tnode *curr; + struct yaffs_tnode *next; + struct yaffs_tnode_list *tnl; + + if (!allocator) { + BUG(); + return YAFFS_FAIL; + } + + if (n_tnodes < 1) + return YAFFS_OK; + + /* make these things */ + new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS); + mem = (u8 *) new_tnodes; + + if (!new_tnodes) { + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs: Could not allocate Tnodes"); + return YAFFS_FAIL; + } + + /* New hookup for wide tnodes */ + for (i = 0; i < n_tnodes - 1; i++) { + curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size]; + next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size]; + curr->internal[0] = next; + } + + curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size]; + curr->internal[0] = allocator->free_tnodes; + allocator->free_tnodes = (struct yaffs_tnode *)mem; + + allocator->n_free_tnodes += n_tnodes; + allocator->n_tnodes_created += n_tnodes; + + /* Now add this bunch of tnodes to a list for freeing up. + * NB If we can't add this to the management list it isn't fatal + * but it just means we can't free this bunch of tnodes later. + */ + tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS); + if (!tnl) { + yaffs_trace(YAFFS_TRACE_ERROR, + "Could not add tnodes to management list"); + return YAFFS_FAIL; + } else { + tnl->tnodes = new_tnodes; + tnl->next = allocator->alloc_tnode_list; + allocator->alloc_tnode_list = tnl; + } + + yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added"); + + return YAFFS_OK; +} + +struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev) +{ + struct yaffs_allocator *allocator = + (struct yaffs_allocator *)dev->allocator; + struct yaffs_tnode *tn = NULL; + + if (!allocator) { + BUG(); + return NULL; + } + + /* If there are none left make more */ + if (!allocator->free_tnodes) + yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES); + + if (allocator->free_tnodes) { + tn = allocator->free_tnodes; + allocator->free_tnodes = allocator->free_tnodes->internal[0]; + allocator->n_free_tnodes--; + } + + return tn; +} + +/* FreeTnode frees up a tnode and puts it back on the free list */ +void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn) +{ + struct yaffs_allocator *allocator = dev->allocator; + + if (!allocator) { + BUG(); + return; + } + + if (tn) { + tn->internal[0] = allocator->free_tnodes; + allocator->free_tnodes = tn; + allocator->n_free_tnodes++; + } + dev->checkpoint_blocks_required = 0; /* force recalculation */ +} + +/*--------------- yaffs_obj alloaction ------------------------ + * + * Free yaffs_objs are stored in a list using obj->siblings. + * The blocks of allocated objects are stored in a linked list. + */ + +static void yaffs_init_raw_objs(struct yaffs_dev *dev) +{ + struct yaffs_allocator *allocator = dev->allocator; + + if (!allocator) { + BUG(); + return; + } + + allocator->allocated_obj_list = NULL; + INIT_LIST_HEAD(&allocator->free_objs); + allocator->n_free_objects = 0; +} + +static void yaffs_deinit_raw_objs(struct yaffs_dev *dev) +{ + struct yaffs_allocator *allocator = dev->allocator; + struct yaffs_obj_list *tmp; + + if (!allocator) { + BUG(); + return; + } + + while (allocator->allocated_obj_list) { + tmp = allocator->allocated_obj_list->next; + kfree(allocator->allocated_obj_list->objects); + kfree(allocator->allocated_obj_list); + allocator->allocated_obj_list = tmp; + } + + INIT_LIST_HEAD(&allocator->free_objs); + allocator->n_free_objects = 0; + allocator->n_obj_created = 0; +} + +static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj) +{ + struct yaffs_allocator *allocator = dev->allocator; + int i; + struct yaffs_obj *new_objs; + struct yaffs_obj_list *list; + + if (!allocator) { + BUG(); + return YAFFS_FAIL; + } + + if (n_obj < 1) + return YAFFS_OK; + + /* make these things */ + new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS); + list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS); + + if (!new_objs || !list) { + kfree(new_objs); + new_objs = NULL; + kfree(list); + list = NULL; + yaffs_trace(YAFFS_TRACE_ALLOCATE, + "Could not allocate more objects"); + return YAFFS_FAIL; + } + + /* Hook them into the free list */ + for (i = 0; i < n_obj; i++) + list_add(&new_objs[i].siblings, &allocator->free_objs); + + allocator->n_free_objects += n_obj; + allocator->n_obj_created += n_obj; + + /* Now add this bunch of Objects to a list for freeing up. */ + + list->objects = new_objs; + list->next = allocator->allocated_obj_list; + allocator->allocated_obj_list = list; + + return YAFFS_OK; +} + +struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev) +{ + struct yaffs_obj *obj = NULL; + struct list_head *lh; + struct yaffs_allocator *allocator = dev->allocator; + + if (!allocator) { + BUG(); + return obj; + } + + /* If there are none left make more */ + if (list_empty(&allocator->free_objs)) + yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS); + + if (!list_empty(&allocator->free_objs)) { + lh = allocator->free_objs.next; + obj = list_entry(lh, struct yaffs_obj, siblings); + list_del_init(lh); + allocator->n_free_objects--; + } + + return obj; +} + +void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj) +{ + + struct yaffs_allocator *allocator = dev->allocator; + + if (!allocator) { + BUG(); + return; + } + + /* Link into the free list. */ + list_add(&obj->siblings, &allocator->free_objs); + allocator->n_free_objects++; +} + +void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev) +{ + + if (!dev->allocator) { + BUG(); + return; + } + + yaffs_deinit_raw_tnodes(dev); + yaffs_deinit_raw_objs(dev); + kfree(dev->allocator); + dev->allocator = NULL; +} + +void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev) +{ + struct yaffs_allocator *allocator; + + if (dev->allocator) { + BUG(); + return; + } + + allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS); + if (allocator) { + dev->allocator = allocator; + yaffs_init_raw_tnodes(dev); + yaffs_init_raw_objs(dev); + } +} + diff --git a/fs/yaffs2/yaffs_allocator.h b/fs/yaffs2/yaffs_allocator.h new file mode 100644 index 000000000000..a8cc3226421f --- /dev/null +++ b/fs/yaffs2/yaffs_allocator.h @@ -0,0 +1,30 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_ALLOCATOR_H__ +#define __YAFFS_ALLOCATOR_H__ + +#include "yaffs_guts.h" + +void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev); +void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev); + +struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev); +void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn); + +struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev); +void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj); + +#endif diff --git a/fs/yaffs2/yaffs_attribs.c b/fs/yaffs2/yaffs_attribs.c new file mode 100644 index 000000000000..fdc7f2162ce6 --- /dev/null +++ b/fs/yaffs2/yaffs_attribs.c @@ -0,0 +1,124 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_guts.h" +#include "yaffs_attribs.h" + +void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh) +{ + obj->yst_uid = oh->yst_uid; + obj->yst_gid = oh->yst_gid; + obj->yst_atime = oh->yst_atime; + obj->yst_mtime = oh->yst_mtime; + obj->yst_ctime = oh->yst_ctime; + obj->yst_rdev = oh->yst_rdev; +} + +void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj) +{ + oh->yst_uid = obj->yst_uid; + oh->yst_gid = obj->yst_gid; + oh->yst_atime = obj->yst_atime; + oh->yst_mtime = obj->yst_mtime; + oh->yst_ctime = obj->yst_ctime; + oh->yst_rdev = obj->yst_rdev; + +} + +void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c) +{ + obj->yst_mtime = Y_CURRENT_TIME; + if (do_a) + obj->yst_atime = obj->yst_mtime; + if (do_c) + obj->yst_ctime = obj->yst_mtime; +} + +void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev) +{ + yaffs_load_current_time(obj, 1, 1); + obj->yst_rdev = rdev; + obj->yst_uid = uid; + obj->yst_gid = gid; +} + +static loff_t yaffs_get_file_size(struct yaffs_obj *obj) +{ + YCHAR *alias = NULL; + obj = yaffs_get_equivalent_obj(obj); + + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + return obj->variant.file_variant.file_size; + case YAFFS_OBJECT_TYPE_SYMLINK: + alias = obj->variant.symlink_variant.alias; + if (!alias) + return 0; + return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH); + default: + return 0; + } +} + +int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr) +{ + unsigned int valid = attr->ia_valid; + + if (valid & ATTR_MODE) + obj->yst_mode = attr->ia_mode; + if (valid & ATTR_UID) + obj->yst_uid = ia_uid_read(attr); + if (valid & ATTR_GID) + obj->yst_gid = ia_gid_read(attr); + + if (valid & ATTR_ATIME) + obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime); + if (valid & ATTR_CTIME) + obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime); + if (valid & ATTR_MTIME) + obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime); + + if (valid & ATTR_SIZE) + yaffs_resize_file(obj, attr->ia_size); + + yaffs_update_oh(obj, NULL, 1, 0, 0, NULL); + + return YAFFS_OK; + +} + +int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr) +{ + unsigned int valid = 0; + + attr->ia_mode = obj->yst_mode; + valid |= ATTR_MODE; + ia_uid_write( attr, obj->yst_uid ); + valid |= ATTR_UID; + ia_gid_write( attr, obj->yst_gid ); + valid |= ATTR_GID; + + Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime; + valid |= ATTR_ATIME; + Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime; + valid |= ATTR_CTIME; + Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime; + valid |= ATTR_MTIME; + + attr->ia_size = yaffs_get_file_size(obj); + valid |= ATTR_SIZE; + + attr->ia_valid = valid; + + return YAFFS_OK; +} diff --git a/fs/yaffs2/yaffs_attribs.h b/fs/yaffs2/yaffs_attribs.h new file mode 100644 index 000000000000..121d99d38b48 --- /dev/null +++ b/fs/yaffs2/yaffs_attribs.h @@ -0,0 +1,71 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_ATTRIBS_H__ +#define __YAFFS_ATTRIBS_H__ + +#include "yaffs_guts.h" + +void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh); +void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj); +void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev); +void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c); +int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr); +int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr); + + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) +static inline uid_t ia_uid_read(const struct iattr *iattr) +{ + return from_kuid(&init_user_ns, iattr->ia_uid); +} + +static inline gid_t ia_gid_read(const struct iattr *iattr) +{ + return from_kgid(&init_user_ns, iattr->ia_gid); +} + +static inline void ia_uid_write(struct iattr *iattr, uid_t uid) +{ + iattr->ia_uid = make_kuid(&init_user_ns, uid); +} + +static inline void ia_gid_write(struct iattr *iattr, gid_t gid) +{ + iattr->ia_gid = make_kgid(&init_user_ns, gid); +} +#else +static inline uid_t ia_uid_read(const struct iattr *iattr) +{ + return iattr->ia_uid; +} + +static inline gid_t ia_gid_read(const struct iattr *inode) +{ + return iattr->ia_gid; +} + +static inline void ia_uid_write(struct iattr *iattr, uid_t uid) +{ + iattr->ia_uid = uid; +} + +static inline void ia_gid_write(struct iattr *iattr, gid_t gid) +{ + iattr->ia_gid = gid; +} +#endif + +#endif diff --git a/fs/yaffs2/yaffs_bitmap.c b/fs/yaffs2/yaffs_bitmap.c new file mode 100644 index 000000000000..4440e930d6bc --- /dev/null +++ b/fs/yaffs2/yaffs_bitmap.c @@ -0,0 +1,97 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_bitmap.h" +#include "yaffs_trace.h" +/* + * Chunk bitmap manipulations + */ + +static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk) +{ + if (blk < dev->internal_start_block || blk > dev->internal_end_block) { + yaffs_trace(YAFFS_TRACE_ERROR, + "BlockBits block %d is not valid", + blk); + BUG(); + } + return dev->chunk_bits + + (dev->chunk_bit_stride * (blk - dev->internal_start_block)); +} + +void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk) +{ + if (blk < dev->internal_start_block || blk > dev->internal_end_block || + chunk < 0 || chunk >= dev->param.chunks_per_block) { + yaffs_trace(YAFFS_TRACE_ERROR, + "Chunk Id (%d:%d) invalid", + blk, chunk); + BUG(); + } +} + +void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk) +{ + u8 *blk_bits = yaffs_block_bits(dev, blk); + + memset(blk_bits, 0, dev->chunk_bit_stride); +} + +void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk) +{ + u8 *blk_bits = yaffs_block_bits(dev, blk); + + yaffs_verify_chunk_bit_id(dev, blk, chunk); + blk_bits[chunk / 8] &= ~(1 << (chunk & 7)); +} + +void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk) +{ + u8 *blk_bits = yaffs_block_bits(dev, blk); + + yaffs_verify_chunk_bit_id(dev, blk, chunk); + blk_bits[chunk / 8] |= (1 << (chunk & 7)); +} + +int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk) +{ + u8 *blk_bits = yaffs_block_bits(dev, blk); + + yaffs_verify_chunk_bit_id(dev, blk, chunk); + return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0; +} + +int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk) +{ + u8 *blk_bits = yaffs_block_bits(dev, blk); + int i; + + for (i = 0; i < dev->chunk_bit_stride; i++) { + if (*blk_bits) + return 1; + blk_bits++; + } + return 0; +} + +int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk) +{ + u8 *blk_bits = yaffs_block_bits(dev, blk); + int i; + int n = 0; + + for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++) + n += hweight8(*blk_bits); + + return n; +} diff --git a/fs/yaffs2/yaffs_bitmap.h b/fs/yaffs2/yaffs_bitmap.h new file mode 100644 index 000000000000..e26b37d89ae4 --- /dev/null +++ b/fs/yaffs2/yaffs_bitmap.h @@ -0,0 +1,33 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +/* + * Chunk bitmap manipulations + */ + +#ifndef __YAFFS_BITMAP_H__ +#define __YAFFS_BITMAP_H__ + +#include "yaffs_guts.h" + +void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk); +void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk); +void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk); +void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk); +int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk); +int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk); +int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk); + +#endif diff --git a/fs/yaffs2/yaffs_checkptrw.c b/fs/yaffs2/yaffs_checkptrw.c new file mode 100644 index 000000000000..e739fb4a104b --- /dev/null +++ b/fs/yaffs2/yaffs_checkptrw.c @@ -0,0 +1,474 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_checkptrw.h" +#include "yaffs_getblockinfo.h" + +struct yaffs_checkpt_chunk_hdr { + int version; + int seq; + u32 sum; + u32 xor; +} ; + + +static int apply_chunk_offset(struct yaffs_dev *dev, int chunk) +{ + return chunk - dev->chunk_offset; +} + +static int apply_block_offset(struct yaffs_dev *dev, int block) +{ + return block - dev->block_offset; +} + +static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev) +{ + struct yaffs_checkpt_chunk_hdr hdr; + + hdr.version = YAFFS_CHECKPOINT_VERSION; + hdr.seq = dev->checkpt_page_seq; + hdr.sum = dev->checkpt_sum; + hdr.xor = dev->checkpt_xor; + + dev->checkpt_byte_offs = sizeof(hdr); + + memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr)); +} + +static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev) +{ + struct yaffs_checkpt_chunk_hdr hdr; + + memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr)); + + dev->checkpt_byte_offs = sizeof(hdr); + + return hdr.version == YAFFS_CHECKPOINT_VERSION && + hdr.seq == dev->checkpt_page_seq && + hdr.sum == dev->checkpt_sum && + hdr.xor == dev->checkpt_xor; +} + +static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev) +{ + int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "checkpt blocks_avail = %d", blocks_avail); + + return (blocks_avail <= 0) ? 0 : 1; +} + +static int yaffs_checkpt_erase(struct yaffs_dev *dev) +{ + int i; + + if (!dev->drv.drv_erase_fn) + return 0; + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "checking blocks %d to %d", + dev->internal_start_block, dev->internal_end_block); + + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + struct yaffs_block_info *bi = yaffs_get_block_info(dev, i); + int offset_i = apply_block_offset(dev, i); + int result; + + if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "erasing checkpt block %d", i); + + dev->n_erasures++; + + result = dev->drv.drv_erase_fn(dev, offset_i); + if(result) { + bi->block_state = YAFFS_BLOCK_STATE_EMPTY; + dev->n_erased_blocks++; + dev->n_free_chunks += + dev->param.chunks_per_block; + } else { + dev->drv.drv_mark_bad_fn(dev, offset_i); + bi->block_state = YAFFS_BLOCK_STATE_DEAD; + } + } + } + + dev->blocks_in_checkpt = 0; + + return 1; +} + +static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev) +{ + int i; + int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "allocating checkpt block: erased %d reserved %d avail %d next %d ", + dev->n_erased_blocks, dev->param.n_reserved_blocks, + blocks_avail, dev->checkpt_next_block); + + if (dev->checkpt_next_block >= 0 && + dev->checkpt_next_block <= dev->internal_end_block && + blocks_avail > 0) { + + for (i = dev->checkpt_next_block; i <= dev->internal_end_block; + i++) { + struct yaffs_block_info *bi; + + bi = yaffs_get_block_info(dev, i); + if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { + dev->checkpt_next_block = i + 1; + dev->checkpt_cur_block = i; + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "allocating checkpt block %d", i); + return; + } + } + } + yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks"); + + dev->checkpt_next_block = -1; + dev->checkpt_cur_block = -1; +} + +static void yaffs2_checkpt_find_block(struct yaffs_dev *dev) +{ + int i; + struct yaffs_ext_tags tags; + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "find next checkpt block: start: blocks %d next %d", + dev->blocks_in_checkpt, dev->checkpt_next_block); + + if (dev->blocks_in_checkpt < dev->checkpt_max_blocks) + for (i = dev->checkpt_next_block; i <= dev->internal_end_block; + i++) { + int chunk = i * dev->param.chunks_per_block; + enum yaffs_block_state state; + u32 seq; + + dev->tagger.read_chunk_tags_fn(dev, + apply_chunk_offset(dev, chunk), + NULL, &tags); + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "find next checkpt block: search: block %d state %d oid %d seq %d eccr %d", + i, (int) state, + tags.obj_id, tags.seq_number, + tags.ecc_result); + + if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) + continue; + + dev->tagger.query_block_fn(dev, + apply_block_offset(dev, i), + &state, &seq); + if (state == YAFFS_BLOCK_STATE_DEAD) + continue; + + /* Right kind of block */ + dev->checkpt_next_block = tags.obj_id; + dev->checkpt_cur_block = i; + dev->checkpt_block_list[dev->blocks_in_checkpt] = i; + dev->blocks_in_checkpt++; + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "found checkpt block %d", i); + return; + } + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks"); + + dev->checkpt_next_block = -1; + dev->checkpt_cur_block = -1; +} + +int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing) +{ + int i; + + dev->checkpt_open_write = writing; + + /* Got the functions we need? */ + if (!dev->tagger.write_chunk_tags_fn || + !dev->tagger.read_chunk_tags_fn || + !dev->drv.drv_erase_fn || + !dev->drv.drv_mark_bad_fn) + return 0; + + if (writing && !yaffs2_checkpt_space_ok(dev)) + return 0; + + if (!dev->checkpt_buffer) + dev->checkpt_buffer = + kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); + if (!dev->checkpt_buffer) + return 0; + + dev->checkpt_page_seq = 0; + dev->checkpt_byte_count = 0; + dev->checkpt_sum = 0; + dev->checkpt_xor = 0; + dev->checkpt_cur_block = -1; + dev->checkpt_cur_chunk = -1; + dev->checkpt_next_block = dev->internal_start_block; + + if (writing) { + memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk); + yaffs2_checkpt_init_chunk_hdr(dev); + return yaffs_checkpt_erase(dev); + } + + /* Opening for a read */ + /* Set to a value that will kick off a read */ + dev->checkpt_byte_offs = dev->data_bytes_per_chunk; + /* A checkpoint block list of 1 checkpoint block per 16 block is + * (hopefully) going to be way more than we need */ + dev->blocks_in_checkpt = 0; + dev->checkpt_max_blocks = + (dev->internal_end_block - dev->internal_start_block) / 16 + 2; + dev->checkpt_block_list = + kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS); + + if (!dev->checkpt_block_list) + return 0; + + for (i = 0; i < dev->checkpt_max_blocks; i++) + dev->checkpt_block_list[i] = -1; + + return 1; +} + +int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum) +{ + u32 composite_sum; + + composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff); + *sum = composite_sum; + return 1; +} + +static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev) +{ + int chunk; + int offset_chunk; + struct yaffs_ext_tags tags; + + if (dev->checkpt_cur_block < 0) { + yaffs2_checkpt_find_erased_block(dev); + dev->checkpt_cur_chunk = 0; + } + + if (dev->checkpt_cur_block < 0) + return 0; + + tags.is_deleted = 0; + tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */ + tags.chunk_id = dev->checkpt_page_seq + 1; + tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA; + tags.n_bytes = dev->data_bytes_per_chunk; + if (dev->checkpt_cur_chunk == 0) { + /* First chunk we write for the block? Set block state to + checkpoint */ + struct yaffs_block_info *bi = + yaffs_get_block_info(dev, dev->checkpt_cur_block); + bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; + dev->blocks_in_checkpt++; + } + + chunk = + dev->checkpt_cur_block * dev->param.chunks_per_block + + dev->checkpt_cur_chunk; + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "checkpoint wite buffer nand %d(%d:%d) objid %d chId %d", + chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk, + tags.obj_id, tags.chunk_id); + + offset_chunk = apply_chunk_offset(dev, chunk); + + dev->n_page_writes++; + + dev->tagger.write_chunk_tags_fn(dev, offset_chunk, + dev->checkpt_buffer, &tags); + dev->checkpt_page_seq++; + dev->checkpt_cur_chunk++; + if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) { + dev->checkpt_cur_chunk = 0; + dev->checkpt_cur_block = -1; + } + memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk); + + yaffs2_checkpt_init_chunk_hdr(dev); + + + return 1; +} + +int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes) +{ + int i = 0; + int ok = 1; + u8 *data_bytes = (u8 *) data; + + if (!dev->checkpt_buffer) + return 0; + + if (!dev->checkpt_open_write) + return -1; + + while (i < n_bytes && ok) { + dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes; + dev->checkpt_sum += *data_bytes; + dev->checkpt_xor ^= *data_bytes; + + dev->checkpt_byte_offs++; + i++; + data_bytes++; + dev->checkpt_byte_count++; + + if (dev->checkpt_byte_offs < 0 || + dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) + ok = yaffs2_checkpt_flush_buffer(dev); + } + + return i; +} + +int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes) +{ + int i = 0; + int ok = 1; + struct yaffs_ext_tags tags; + int chunk; + int offset_chunk; + u8 *data_bytes = (u8 *) data; + + if (!dev->checkpt_buffer) + return 0; + + if (dev->checkpt_open_write) + return -1; + + while (i < n_bytes && ok) { + + if (dev->checkpt_byte_offs < 0 || + dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) { + + if (dev->checkpt_cur_block < 0) { + yaffs2_checkpt_find_block(dev); + dev->checkpt_cur_chunk = 0; + } + + if (dev->checkpt_cur_block < 0) { + ok = 0; + break; + } + + chunk = dev->checkpt_cur_block * + dev->param.chunks_per_block + + dev->checkpt_cur_chunk; + + offset_chunk = apply_chunk_offset(dev, chunk); + dev->n_page_reads++; + + /* read in the next chunk */ + dev->tagger.read_chunk_tags_fn(dev, + offset_chunk, + dev->checkpt_buffer, + &tags); + + if (tags.chunk_id != (dev->checkpt_page_seq + 1) || + tags.ecc_result > YAFFS_ECC_RESULT_FIXED || + tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) { + ok = 0; + break; + } + if(!yaffs2_checkpt_check_chunk_hdr(dev)) { + ok = 0; + break; + } + + dev->checkpt_page_seq++; + dev->checkpt_cur_chunk++; + + if (dev->checkpt_cur_chunk >= + dev->param.chunks_per_block) + dev->checkpt_cur_block = -1; + + } + + *data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs]; + dev->checkpt_sum += *data_bytes; + dev->checkpt_xor ^= *data_bytes; + dev->checkpt_byte_offs++; + i++; + data_bytes++; + dev->checkpt_byte_count++; + } + + return i; +} + +int yaffs_checkpt_close(struct yaffs_dev *dev) +{ + int i; + + if (dev->checkpt_open_write) { + if (dev->checkpt_byte_offs != + sizeof(sizeof(struct yaffs_checkpt_chunk_hdr))) + yaffs2_checkpt_flush_buffer(dev); + } else if (dev->checkpt_block_list) { + for (i = 0; + i < dev->blocks_in_checkpt && + dev->checkpt_block_list[i] >= 0; i++) { + int blk = dev->checkpt_block_list[i]; + struct yaffs_block_info *bi = NULL; + + if (dev->internal_start_block <= blk && + blk <= dev->internal_end_block) + bi = yaffs_get_block_info(dev, blk); + if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY) + bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; + } + kfree(dev->checkpt_block_list); + dev->checkpt_block_list = NULL; + } + + dev->n_free_chunks -= + dev->blocks_in_checkpt * dev->param.chunks_per_block; + dev->n_erased_blocks -= dev->blocks_in_checkpt; + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d", + dev->checkpt_byte_count); + + if (dev->checkpt_buffer) { + /* free the buffer */ + kfree(dev->checkpt_buffer); + dev->checkpt_buffer = NULL; + return 1; + } else { + return 0; + } +} + +int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev) +{ + /* Erase the checkpoint data */ + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "checkpoint invalidate of %d blocks", + dev->blocks_in_checkpt); + + return yaffs_checkpt_erase(dev); +} diff --git a/fs/yaffs2/yaffs_checkptrw.h b/fs/yaffs2/yaffs_checkptrw.h new file mode 100644 index 000000000000..cdbaba7153ed --- /dev/null +++ b/fs/yaffs2/yaffs_checkptrw.h @@ -0,0 +1,33 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_CHECKPTRW_H__ +#define __YAFFS_CHECKPTRW_H__ + +#include "yaffs_guts.h" + +int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing); + +int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes); + +int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes); + +int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum); + +int yaffs_checkpt_close(struct yaffs_dev *dev); + +int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev); + +#endif diff --git a/fs/yaffs2/yaffs_ecc.c b/fs/yaffs2/yaffs_ecc.c new file mode 100644 index 000000000000..9294107c150d --- /dev/null +++ b/fs/yaffs2/yaffs_ecc.c @@ -0,0 +1,281 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * This code implements the ECC algorithm used in SmartMedia. + * + * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes. + * The two unused bit are set to 1. + * The ECC can correct single bit errors in a 256-byte page of data. Thus, two + * such ECC blocks are used on a 512-byte NAND page. + * + */ + +#include "yportenv.h" + +#include "yaffs_ecc.h" + +/* Table generated by gen-ecc.c + * Using a table means we do not have to calculate p1..p4 and p1'..p4' + * for each byte of data. These are instead provided in a table in bits7..2. + * Bit 0 of each entry indicates whether the entry has an odd or even parity, + * and therefore this bytes influence on the line parity. + */ + +static const unsigned char column_parity_table[] = { + 0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69, + 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00, + 0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc, + 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95, + 0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0, + 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99, + 0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65, + 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c, + 0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc, + 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5, + 0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59, + 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30, + 0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55, + 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c, + 0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0, + 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9, + 0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0, + 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9, + 0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55, + 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c, + 0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59, + 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30, + 0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc, + 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5, + 0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65, + 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c, + 0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0, + 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99, + 0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc, + 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95, + 0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69, + 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00, +}; + + +/* Calculate the ECC for a 256-byte block of data */ +void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc) +{ + unsigned int i; + unsigned char col_parity = 0; + unsigned char line_parity = 0; + unsigned char line_parity_prime = 0; + unsigned char t; + unsigned char b; + + for (i = 0; i < 256; i++) { + b = column_parity_table[*data++]; + col_parity ^= b; + + if (b & 0x01) { /* odd number of bits in the byte */ + line_parity ^= i; + line_parity_prime ^= ~i; + } + } + + ecc[2] = (~col_parity) | 0x03; + + t = 0; + if (line_parity & 0x80) + t |= 0x80; + if (line_parity_prime & 0x80) + t |= 0x40; + if (line_parity & 0x40) + t |= 0x20; + if (line_parity_prime & 0x40) + t |= 0x10; + if (line_parity & 0x20) + t |= 0x08; + if (line_parity_prime & 0x20) + t |= 0x04; + if (line_parity & 0x10) + t |= 0x02; + if (line_parity_prime & 0x10) + t |= 0x01; + ecc[1] = ~t; + + t = 0; + if (line_parity & 0x08) + t |= 0x80; + if (line_parity_prime & 0x08) + t |= 0x40; + if (line_parity & 0x04) + t |= 0x20; + if (line_parity_prime & 0x04) + t |= 0x10; + if (line_parity & 0x02) + t |= 0x08; + if (line_parity_prime & 0x02) + t |= 0x04; + if (line_parity & 0x01) + t |= 0x02; + if (line_parity_prime & 0x01) + t |= 0x01; + ecc[0] = ~t; + +} + +/* Correct the ECC on a 256 byte block of data */ + +int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc, + const unsigned char *test_ecc) +{ + unsigned char d0, d1, d2; /* deltas */ + + d0 = read_ecc[0] ^ test_ecc[0]; + d1 = read_ecc[1] ^ test_ecc[1]; + d2 = read_ecc[2] ^ test_ecc[2]; + + if ((d0 | d1 | d2) == 0) + return 0; /* no error */ + + if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 && + ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 && + ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) { + /* Single bit (recoverable) error in data */ + + unsigned byte; + unsigned bit; + + bit = byte = 0; + + if (d1 & 0x80) + byte |= 0x80; + if (d1 & 0x20) + byte |= 0x40; + if (d1 & 0x08) + byte |= 0x20; + if (d1 & 0x02) + byte |= 0x10; + if (d0 & 0x80) + byte |= 0x08; + if (d0 & 0x20) + byte |= 0x04; + if (d0 & 0x08) + byte |= 0x02; + if (d0 & 0x02) + byte |= 0x01; + + if (d2 & 0x80) + bit |= 0x04; + if (d2 & 0x20) + bit |= 0x02; + if (d2 & 0x08) + bit |= 0x01; + + data[byte] ^= (1 << bit); + + return 1; /* Corrected the error */ + } + + if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) { + /* Reccoverable error in ecc */ + + read_ecc[0] = test_ecc[0]; + read_ecc[1] = test_ecc[1]; + read_ecc[2] = test_ecc[2]; + + return 1; /* Corrected the error */ + } + + /* Unrecoverable error */ + + return -1; + +} + +/* + * ECCxxxOther does ECC calcs on arbitrary n bytes of data + */ +void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes, + struct yaffs_ecc_other *ecc_other) +{ + unsigned int i; + unsigned char col_parity = 0; + unsigned line_parity = 0; + unsigned line_parity_prime = 0; + unsigned char b; + + for (i = 0; i < n_bytes; i++) { + b = column_parity_table[*data++]; + col_parity ^= b; + + if (b & 0x01) { + /* odd number of bits in the byte */ + line_parity ^= i; + line_parity_prime ^= ~i; + } + + } + + ecc_other->col_parity = (col_parity >> 2) & 0x3f; + ecc_other->line_parity = line_parity; + ecc_other->line_parity_prime = line_parity_prime; +} + +int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes, + struct yaffs_ecc_other *read_ecc, + const struct yaffs_ecc_other *test_ecc) +{ + unsigned char delta_col; /* column parity delta */ + unsigned delta_line; /* line parity delta */ + unsigned delta_line_prime; /* line parity delta */ + unsigned bit; + + delta_col = read_ecc->col_parity ^ test_ecc->col_parity; + delta_line = read_ecc->line_parity ^ test_ecc->line_parity; + delta_line_prime = + read_ecc->line_parity_prime ^ test_ecc->line_parity_prime; + + if ((delta_col | delta_line | delta_line_prime) == 0) + return 0; /* no error */ + + if (delta_line == ~delta_line_prime && + (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) { + /* Single bit (recoverable) error in data */ + + bit = 0; + + if (delta_col & 0x20) + bit |= 0x04; + if (delta_col & 0x08) + bit |= 0x02; + if (delta_col & 0x02) + bit |= 0x01; + + if (delta_line >= n_bytes) + return -1; + + data[delta_line] ^= (1 << bit); + + return 1; /* corrected */ + } + + if ((hweight32(delta_line) + + hweight32(delta_line_prime) + + hweight8(delta_col)) == 1) { + /* Reccoverable error in ecc */ + + *read_ecc = *test_ecc; + return 1; /* corrected */ + } + + /* Unrecoverable error */ + + return -1; +} diff --git a/fs/yaffs2/yaffs_ecc.h b/fs/yaffs2/yaffs_ecc.h new file mode 100644 index 000000000000..17d47bd80f3e --- /dev/null +++ b/fs/yaffs2/yaffs_ecc.h @@ -0,0 +1,44 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +/* + * This code implements the ECC algorithm used in SmartMedia. + * + * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes. + * The two unused bit are set to 1. + * The ECC can correct single bit errors in a 256-byte page of data. + * Thus, two such ECC blocks are used on a 512-byte NAND page. + * + */ + +#ifndef __YAFFS_ECC_H__ +#define __YAFFS_ECC_H__ + +struct yaffs_ecc_other { + unsigned char col_parity; + unsigned line_parity; + unsigned line_parity_prime; +}; + +void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc); +int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc, + const unsigned char *test_ecc); + +void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes, + struct yaffs_ecc_other *ecc); +int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes, + struct yaffs_ecc_other *read_ecc, + const struct yaffs_ecc_other *test_ecc); +#endif diff --git a/fs/yaffs2/yaffs_getblockinfo.h b/fs/yaffs2/yaffs_getblockinfo.h new file mode 100644 index 000000000000..8fd0802bdddb --- /dev/null +++ b/fs/yaffs2/yaffs_getblockinfo.h @@ -0,0 +1,35 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_GETBLOCKINFO_H__ +#define __YAFFS_GETBLOCKINFO_H__ + +#include "yaffs_guts.h" +#include "yaffs_trace.h" + +/* Function to manipulate block info */ +static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev + *dev, int blk) +{ + if (blk < dev->internal_start_block || blk > dev->internal_end_block) { + yaffs_trace(YAFFS_TRACE_ERROR, + "**>> yaffs: get_block_info block %d is not valid", + blk); + BUG(); + } + return &dev->block_info[blk - dev->internal_start_block]; +} + +#endif diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c new file mode 100644 index 000000000000..1fd464d68af7 --- /dev/null +++ b/fs/yaffs2/yaffs_guts.c @@ -0,0 +1,5082 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yportenv.h" +#include "yaffs_trace.h" + +#include "yaffs_guts.h" +#include "yaffs_getblockinfo.h" +#include "yaffs_tagscompat.h" +#include "yaffs_tagsmarshall.h" +#include "yaffs_nand.h" +#include "yaffs_yaffs1.h" +#include "yaffs_yaffs2.h" +#include "yaffs_bitmap.h" +#include "yaffs_verify.h" +#include "yaffs_nand.h" +#include "yaffs_packedtags2.h" +#include "yaffs_nameval.h" +#include "yaffs_allocator.h" +#include "yaffs_attribs.h" +#include "yaffs_summary.h" + +/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */ +#define YAFFS_GC_GOOD_ENOUGH 2 +#define YAFFS_GC_PASSIVE_THRESHOLD 4 + +#include "yaffs_ecc.h" + +/* Forward declarations */ + +static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk, + const u8 *buffer, int n_bytes, int use_reserve); + +static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name, + int buffer_size); + +/* Function to calculate chunk and offset */ + +void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr, + int *chunk_out, u32 *offset_out) +{ + int chunk; + u32 offset; + + chunk = (u32) (addr >> dev->chunk_shift); + + if (dev->chunk_div == 1) { + /* easy power of 2 case */ + offset = (u32) (addr & dev->chunk_mask); + } else { + /* Non power-of-2 case */ + + loff_t chunk_base; + + chunk /= dev->chunk_div; + + chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk; + offset = (u32) (addr - chunk_base); + } + + *chunk_out = chunk; + *offset_out = offset; +} + +/* Function to return the number of shifts for a power of 2 greater than or + * equal to the given number + * Note we don't try to cater for all possible numbers and this does not have to + * be hellishly efficient. + */ + +static inline u32 calc_shifts_ceiling(u32 x) +{ + int extra_bits; + int shifts; + + shifts = extra_bits = 0; + + while (x > 1) { + if (x & 1) + extra_bits++; + x >>= 1; + shifts++; + } + + if (extra_bits) + shifts++; + + return shifts; +} + +/* Function to return the number of shifts to get a 1 in bit 0 + */ + +static inline u32 calc_shifts(u32 x) +{ + u32 shifts; + + shifts = 0; + + if (!x) + return 0; + + while (!(x & 1)) { + x >>= 1; + shifts++; + } + + return shifts; +} + +/* + * Temporary buffer manipulations. + */ + +static int yaffs_init_tmp_buffers(struct yaffs_dev *dev) +{ + int i; + u8 *buf = (u8 *) 1; + + memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer)); + + for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) { + dev->temp_buffer[i].in_use = 0; + buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); + dev->temp_buffer[i].buffer = buf; + } + + return buf ? YAFFS_OK : YAFFS_FAIL; +} + +u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev) +{ + int i; + + dev->temp_in_use++; + if (dev->temp_in_use > dev->max_temp) + dev->max_temp = dev->temp_in_use; + + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { + if (dev->temp_buffer[i].in_use == 0) { + dev->temp_buffer[i].in_use = 1; + return dev->temp_buffer[i].buffer; + } + } + + yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers"); + /* + * If we got here then we have to allocate an unmanaged one + * This is not good. + */ + + dev->unmanaged_buffer_allocs++; + return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS); + +} + +void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer) +{ + int i; + + dev->temp_in_use--; + + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { + if (dev->temp_buffer[i].buffer == buffer) { + dev->temp_buffer[i].in_use = 0; + return; + } + } + + if (buffer) { + /* assume it is an unmanaged one. */ + yaffs_trace(YAFFS_TRACE_BUFFERS, + "Releasing unmanaged temp buffer"); + kfree(buffer); + dev->unmanaged_buffer_deallocs++; + } + +} + +/* + * Functions for robustisizing TODO + * + */ + +static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk, + const u8 *data, + const struct yaffs_ext_tags *tags) +{ + (void) dev; + (void) nand_chunk; + (void) data; + (void) tags; +} + +static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk, + const struct yaffs_ext_tags *tags) +{ + (void) dev; + (void) nand_chunk; + (void) tags; +} + +void yaffs_handle_chunk_error(struct yaffs_dev *dev, + struct yaffs_block_info *bi) +{ + if (!bi->gc_prioritise) { + bi->gc_prioritise = 1; + dev->has_pending_prioritised_gc = 1; + bi->chunk_error_strikes++; + + if (bi->chunk_error_strikes > 3) { + bi->needs_retiring = 1; /* Too many stikes, so retire */ + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs: Block struck out"); + + } + } +} + +static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk, + int erased_ok) +{ + int flash_block = nand_chunk / dev->param.chunks_per_block; + struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); + + yaffs_handle_chunk_error(dev, bi); + + if (erased_ok) { + /* Was an actual write failure, + * so mark the block for retirement.*/ + bi->needs_retiring = 1; + yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + "**>> Block %d needs retiring", flash_block); + } + + /* Delete the chunk */ + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + yaffs_skip_rest_of_block(dev); +} + +/* + * Verification code + */ + +/* + * Simple hash function. Needs to have a reasonable spread + */ + +static inline int yaffs_hash_fn(int n) +{ + if (n < 0) + n = -n; + return n % YAFFS_NOBJECT_BUCKETS; +} + +/* + * Access functions to useful fake objects. + * Note that root might have a presence in NAND if permissions are set. + */ + +struct yaffs_obj *yaffs_root(struct yaffs_dev *dev) +{ + return dev->root_dir; +} + +struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev) +{ + return dev->lost_n_found; +} + +/* + * Erased NAND checking functions + */ + +int yaffs_check_ff(u8 *buffer, int n_bytes) +{ + /* Horrible, slow implementation */ + while (n_bytes--) { + if (*buffer != 0xff) + return 0; + buffer++; + } + return 1; +} + +static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk) +{ + int retval = YAFFS_OK; + u8 *data = yaffs_get_temp_buffer(dev); + struct yaffs_ext_tags tags; + int result; + + result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags); + + if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR) + retval = YAFFS_FAIL; + + if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || + tags.chunk_used) { + yaffs_trace(YAFFS_TRACE_NANDACCESS, + "Chunk %d not erased", nand_chunk); + retval = YAFFS_FAIL; + } + + yaffs_release_temp_buffer(dev, data); + + return retval; + +} + +static int yaffs_verify_chunk_written(struct yaffs_dev *dev, + int nand_chunk, + const u8 *data, + struct yaffs_ext_tags *tags) +{ + int retval = YAFFS_OK; + struct yaffs_ext_tags temp_tags; + u8 *buffer = yaffs_get_temp_buffer(dev); + int result; + + result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags); + if (memcmp(buffer, data, dev->data_bytes_per_chunk) || + temp_tags.obj_id != tags->obj_id || + temp_tags.chunk_id != tags->chunk_id || + temp_tags.n_bytes != tags->n_bytes) + retval = YAFFS_FAIL; + + yaffs_release_temp_buffer(dev, buffer); + + return retval; +} + + +int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks) +{ + int reserved_chunks; + int reserved_blocks = dev->param.n_reserved_blocks; + int checkpt_blocks; + + checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev); + + reserved_chunks = + (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block; + + return (dev->n_free_chunks > (reserved_chunks + n_chunks)); +} + +static int yaffs_find_alloc_block(struct yaffs_dev *dev) +{ + int i; + struct yaffs_block_info *bi; + + if (dev->n_erased_blocks < 1) { + /* Hoosterman we've got a problem. + * Can't get space to gc + */ + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy: no more erased blocks"); + + return -1; + } + + /* Find an empty block. */ + + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + dev->alloc_block_finder++; + if (dev->alloc_block_finder < dev->internal_start_block + || dev->alloc_block_finder > dev->internal_end_block) { + dev->alloc_block_finder = dev->internal_start_block; + } + + bi = yaffs_get_block_info(dev, dev->alloc_block_finder); + + if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { + bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING; + dev->seq_number++; + bi->seq_number = dev->seq_number; + dev->n_erased_blocks--; + yaffs_trace(YAFFS_TRACE_ALLOCATE, + "Allocated block %d, seq %d, %d left" , + dev->alloc_block_finder, dev->seq_number, + dev->n_erased_blocks); + return dev->alloc_block_finder; + } + } + + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs tragedy: no more erased blocks, but there should have been %d", + dev->n_erased_blocks); + + return -1; +} + +static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver, + struct yaffs_block_info **block_ptr) +{ + int ret_val; + struct yaffs_block_info *bi; + + if (dev->alloc_block < 0) { + /* Get next block to allocate off */ + dev->alloc_block = yaffs_find_alloc_block(dev); + dev->alloc_page = 0; + } + + if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) { + /* No space unless we're allowed to use the reserve. */ + return -1; + } + + if (dev->n_erased_blocks < dev->param.n_reserved_blocks + && dev->alloc_page == 0) + yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve"); + + /* Next page please.... */ + if (dev->alloc_block >= 0) { + bi = yaffs_get_block_info(dev, dev->alloc_block); + + ret_val = (dev->alloc_block * dev->param.chunks_per_block) + + dev->alloc_page; + bi->pages_in_use++; + yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page); + + dev->alloc_page++; + + dev->n_free_chunks--; + + /* If the block is full set the state to full */ + if (dev->alloc_page >= dev->param.chunks_per_block) { + bi->block_state = YAFFS_BLOCK_STATE_FULL; + dev->alloc_block = -1; + } + + if (block_ptr) + *block_ptr = bi; + + return ret_val; + } + + yaffs_trace(YAFFS_TRACE_ERROR, + "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!"); + + return -1; +} + +static int yaffs_get_erased_chunks(struct yaffs_dev *dev) +{ + int n; + + n = dev->n_erased_blocks * dev->param.chunks_per_block; + + if (dev->alloc_block > 0) + n += (dev->param.chunks_per_block - dev->alloc_page); + + return n; + +} + +/* + * yaffs_skip_rest_of_block() skips over the rest of the allocation block + * if we don't want to write to it. + */ +void yaffs_skip_rest_of_block(struct yaffs_dev *dev) +{ + struct yaffs_block_info *bi; + + if (dev->alloc_block > 0) { + bi = yaffs_get_block_info(dev, dev->alloc_block); + if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) { + bi->block_state = YAFFS_BLOCK_STATE_FULL; + dev->alloc_block = -1; + } + } +} + +static int yaffs_write_new_chunk(struct yaffs_dev *dev, + const u8 *data, + struct yaffs_ext_tags *tags, int use_reserver) +{ + int attempts = 0; + int write_ok = 0; + int chunk; + + yaffs2_checkpt_invalidate(dev); + + do { + struct yaffs_block_info *bi = 0; + int erased_ok = 0; + + chunk = yaffs_alloc_chunk(dev, use_reserver, &bi); + if (chunk < 0) { + /* no space */ + break; + } + + /* First check this chunk is erased, if it needs + * checking. The checking policy (unless forced + * always on) is as follows: + * + * Check the first page we try to write in a block. + * If the check passes then we don't need to check any + * more. If the check fails, we check again... + * If the block has been erased, we don't need to check. + * + * However, if the block has been prioritised for gc, + * then we think there might be something odd about + * this block and stop using it. + * + * Rationale: We should only ever see chunks that have + * not been erased if there was a partially written + * chunk due to power loss. This checking policy should + * catch that case with very few checks and thus save a + * lot of checks that are most likely not needed. + * + * Mods to the above + * If an erase check fails or the write fails we skip the + * rest of the block. + */ + + /* let's give it a try */ + attempts++; + + if (dev->param.always_check_erased) + bi->skip_erased_check = 0; + + if (!bi->skip_erased_check) { + erased_ok = yaffs_check_chunk_erased(dev, chunk); + if (erased_ok != YAFFS_OK) { + yaffs_trace(YAFFS_TRACE_ERROR, + "**>> yaffs chunk %d was not erased", + chunk); + + /* If not erased, delete this one, + * skip rest of block and + * try another chunk */ + yaffs_chunk_del(dev, chunk, 1, __LINE__); + yaffs_skip_rest_of_block(dev); + continue; + } + } + + write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags); + + if (!bi->skip_erased_check) + write_ok = + yaffs_verify_chunk_written(dev, chunk, data, tags); + + if (write_ok != YAFFS_OK) { + /* Clean up aborted write, skip to next block and + * try another chunk */ + yaffs_handle_chunk_wr_error(dev, chunk, erased_ok); + continue; + } + + bi->skip_erased_check = 1; + + /* Copy the data into the robustification buffer */ + yaffs_handle_chunk_wr_ok(dev, chunk, data, tags); + + } while (write_ok != YAFFS_OK && + (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts)); + + if (!write_ok) + chunk = -1; + + if (attempts > 1) { + yaffs_trace(YAFFS_TRACE_ERROR, + "**>> yaffs write required %d attempts", + attempts); + dev->n_retried_writes += (attempts - 1); + } + + return chunk; +} + +/* + * Block retiring for handling a broken block. + */ + +static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block) +{ + struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); + + yaffs2_checkpt_invalidate(dev); + + yaffs2_clear_oldest_dirty_seq(dev, bi); + + if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) { + if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs: Failed to mark bad and erase block %d", + flash_block); + } else { + struct yaffs_ext_tags tags; + int chunk_id = + flash_block * dev->param.chunks_per_block; + + u8 *buffer = yaffs_get_temp_buffer(dev); + + memset(buffer, 0xff, dev->data_bytes_per_chunk); + memset(&tags, 0, sizeof(tags)); + tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK; + if (dev->tagger.write_chunk_tags_fn(dev, chunk_id - + dev->chunk_offset, + buffer, + &tags) != YAFFS_OK) + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs: Failed to write bad block marker to block %d", + flash_block); + + yaffs_release_temp_buffer(dev, buffer); + } + } + + bi->block_state = YAFFS_BLOCK_STATE_DEAD; + bi->gc_prioritise = 0; + bi->needs_retiring = 0; + + dev->n_retired_blocks++; +} + +/*---------------- Name handling functions ------------*/ + +static u16 yaffs_calc_name_sum(const YCHAR *name) +{ + u16 sum = 0; + u16 i = 1; + + if (!name) + return 0; + + while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) { + + /* 0x1f mask is case insensitive */ + sum += ((*name) & 0x1f) * i; + i++; + name++; + } + return sum; +} + + +void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name) +{ + memset(obj->short_name, 0, sizeof(obj->short_name)); + + if (name && !name[0]) { + yaffs_fix_null_name(obj, obj->short_name, + YAFFS_SHORT_NAME_LENGTH); + name = obj->short_name; + } else if (name && + strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <= + YAFFS_SHORT_NAME_LENGTH) { + strcpy(obj->short_name, name); + } + + obj->sum = yaffs_calc_name_sum(name); +} + +void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj, + const struct yaffs_obj_hdr *oh) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1]; + memset(tmp_name, 0, sizeof(tmp_name)); + yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name, + YAFFS_MAX_NAME_LENGTH + 1); + yaffs_set_obj_name(obj, tmp_name); +#else + yaffs_set_obj_name(obj, oh->name); +#endif +} + +loff_t yaffs_max_file_size(struct yaffs_dev *dev) +{ + if(sizeof(loff_t) < 8) + return YAFFS_MAX_FILE_SIZE_32; + else + return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk; +} + +/*-------------------- TNODES ------------------- + + * List of spare tnodes + * The list is hooked together using the first pointer + * in the tnode. + */ + +struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev) +{ + struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev); + + if (tn) { + memset(tn, 0, dev->tnode_size); + dev->n_tnodes++; + } + + dev->checkpoint_blocks_required = 0; /* force recalculation */ + + return tn; +} + +/* FreeTnode frees up a tnode and puts it back on the free list */ +static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn) +{ + yaffs_free_raw_tnode(dev, tn); + dev->n_tnodes--; + dev->checkpoint_blocks_required = 0; /* force recalculation */ +} + +static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev) +{ + yaffs_deinit_raw_tnodes_and_objs(dev); + dev->n_obj = 0; + dev->n_tnodes = 0; +} + +static void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn, + unsigned pos, unsigned val) +{ + u32 *map = (u32 *) tn; + u32 bit_in_map; + u32 bit_in_word; + u32 word_in_map; + u32 mask; + + pos &= YAFFS_TNODES_LEVEL0_MASK; + val >>= dev->chunk_grp_bits; + + bit_in_map = pos * dev->tnode_width; + word_in_map = bit_in_map / 32; + bit_in_word = bit_in_map & (32 - 1); + + mask = dev->tnode_mask << bit_in_word; + + map[word_in_map] &= ~mask; + map[word_in_map] |= (mask & (val << bit_in_word)); + + if (dev->tnode_width > (32 - bit_in_word)) { + bit_in_word = (32 - bit_in_word); + word_in_map++; + mask = + dev->tnode_mask >> bit_in_word; + map[word_in_map] &= ~mask; + map[word_in_map] |= (mask & (val >> bit_in_word)); + } +} + +u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn, + unsigned pos) +{ + u32 *map = (u32 *) tn; + u32 bit_in_map; + u32 bit_in_word; + u32 word_in_map; + u32 val; + + pos &= YAFFS_TNODES_LEVEL0_MASK; + + bit_in_map = pos * dev->tnode_width; + word_in_map = bit_in_map / 32; + bit_in_word = bit_in_map & (32 - 1); + + val = map[word_in_map] >> bit_in_word; + + if (dev->tnode_width > (32 - bit_in_word)) { + bit_in_word = (32 - bit_in_word); + word_in_map++; + val |= (map[word_in_map] << bit_in_word); + } + + val &= dev->tnode_mask; + val <<= dev->chunk_grp_bits; + + return val; +} + +/* ------------------- End of individual tnode manipulation -----------------*/ + +/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------ + * The look up tree is represented by the top tnode and the number of top_level + * in the tree. 0 means only the level 0 tnode is in the tree. + */ + +/* FindLevel0Tnode finds the level 0 tnode, if one exists. */ +struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev, + struct yaffs_file_var *file_struct, + u32 chunk_id) +{ + struct yaffs_tnode *tn = file_struct->top; + u32 i; + int required_depth; + int level = file_struct->top_level; + + (void) dev; + + /* Check sane level and chunk Id */ + if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) + return NULL; + + if (chunk_id > YAFFS_MAX_CHUNK_ID) + return NULL; + + /* First check we're tall enough (ie enough top_level) */ + + i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; + required_depth = 0; + while (i) { + i >>= YAFFS_TNODES_INTERNAL_BITS; + required_depth++; + } + + if (required_depth > file_struct->top_level) + return NULL; /* Not tall enough, so we can't find it */ + + /* Traverse down to level 0 */ + while (level > 0 && tn) { + tn = tn->internal[(chunk_id >> + (YAFFS_TNODES_LEVEL0_BITS + + (level - 1) * + YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK]; + level--; + } + + return tn; +} + +/* add_find_tnode_0 finds the level 0 tnode if it exists, + * otherwise first expands the tree. + * This happens in two steps: + * 1. If the tree isn't tall enough, then make it taller. + * 2. Scan down the tree towards the level 0 tnode adding tnodes if required. + * + * Used when modifying the tree. + * + * If the tn argument is NULL, then a fresh tnode will be added otherwise the + * specified tn will be plugged into the ttree. + */ + +struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev, + struct yaffs_file_var *file_struct, + u32 chunk_id, + struct yaffs_tnode *passed_tn) +{ + int required_depth; + int i; + int l; + struct yaffs_tnode *tn; + u32 x; + + /* Check sane level and page Id */ + if (file_struct->top_level < 0 || + file_struct->top_level > YAFFS_TNODES_MAX_LEVEL) + return NULL; + + if (chunk_id > YAFFS_MAX_CHUNK_ID) + return NULL; + + /* First check we're tall enough (ie enough top_level) */ + + x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; + required_depth = 0; + while (x) { + x >>= YAFFS_TNODES_INTERNAL_BITS; + required_depth++; + } + + if (required_depth > file_struct->top_level) { + /* Not tall enough, gotta make the tree taller */ + for (i = file_struct->top_level; i < required_depth; i++) { + + tn = yaffs_get_tnode(dev); + + if (tn) { + tn->internal[0] = file_struct->top; + file_struct->top = tn; + file_struct->top_level++; + } else { + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs: no more tnodes"); + return NULL; + } + } + } + + /* Traverse down to level 0, adding anything we need */ + + l = file_struct->top_level; + tn = file_struct->top; + + if (l > 0) { + while (l > 0 && tn) { + x = (chunk_id >> + (YAFFS_TNODES_LEVEL0_BITS + + (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK; + + if ((l > 1) && !tn->internal[x]) { + /* Add missing non-level-zero tnode */ + tn->internal[x] = yaffs_get_tnode(dev); + if (!tn->internal[x]) + return NULL; + } else if (l == 1) { + /* Looking from level 1 at level 0 */ + if (passed_tn) { + /* If we already have one, release it */ + if (tn->internal[x]) + yaffs_free_tnode(dev, + tn->internal[x]); + tn->internal[x] = passed_tn; + + } else if (!tn->internal[x]) { + /* Don't have one, none passed in */ + tn->internal[x] = yaffs_get_tnode(dev); + if (!tn->internal[x]) + return NULL; + } + } + + tn = tn->internal[x]; + l--; + } + } else { + /* top is level 0 */ + if (passed_tn) { + memcpy(tn, passed_tn, + (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8); + yaffs_free_tnode(dev, passed_tn); + } + } + + return tn; +} + +static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id, + int chunk_obj) +{ + return (tags->chunk_id == chunk_obj && + tags->obj_id == obj_id && + !tags->is_deleted) ? 1 : 0; + +} + +static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk, + struct yaffs_ext_tags *tags, int obj_id, + int inode_chunk) +{ + int j; + + for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) { + if (yaffs_check_chunk_bit + (dev, the_chunk / dev->param.chunks_per_block, + the_chunk % dev->param.chunks_per_block)) { + + if (dev->chunk_grp_size == 1) + return the_chunk; + else { + yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL, + tags); + if (yaffs_tags_match(tags, + obj_id, inode_chunk)) { + /* found it; */ + return the_chunk; + } + } + } + the_chunk++; + } + return -1; +} + +int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, + struct yaffs_ext_tags *tags) +{ + /*Get the Tnode, then get the level 0 offset chunk offset */ + struct yaffs_tnode *tn; + int the_chunk = -1; + struct yaffs_ext_tags local_tags; + int ret_val = -1; + struct yaffs_dev *dev = in->my_dev; + + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &local_tags; + } + + tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); + + if (!tn) + return ret_val; + + the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); + + ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, + inode_chunk); + return ret_val; +} + +static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk, + struct yaffs_ext_tags *tags) +{ + /* Get the Tnode, then get the level 0 offset chunk offset */ + struct yaffs_tnode *tn; + int the_chunk = -1; + struct yaffs_ext_tags local_tags; + struct yaffs_dev *dev = in->my_dev; + int ret_val = -1; + + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &local_tags; + } + + tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); + + if (!tn) + return ret_val; + + the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); + + ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, + inode_chunk); + + /* Delete the entry in the filestructure (if found) */ + if (ret_val != -1) + yaffs_load_tnode_0(dev, tn, inode_chunk, 0); + + return ret_val; +} + +int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk, + int nand_chunk, int in_scan) +{ + /* NB in_scan is zero unless scanning. + * For forward scanning, in_scan is > 0; + * for backward scanning in_scan is < 0 + * + * nand_chunk = 0 is a dummy insert to make sure the tnodes are there. + */ + + struct yaffs_tnode *tn; + struct yaffs_dev *dev = in->my_dev; + int existing_cunk; + struct yaffs_ext_tags existing_tags; + struct yaffs_ext_tags new_tags; + unsigned existing_serial, new_serial; + + if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) { + /* Just ignore an attempt at putting a chunk into a non-file + * during scanning. + * If it is not during Scanning then something went wrong! + */ + if (!in_scan) { + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy:attempt to put data chunk into a non-file" + ); + BUG(); + } + + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + return YAFFS_OK; + } + + tn = yaffs_add_find_tnode_0(dev, + &in->variant.file_variant, + inode_chunk, NULL); + if (!tn) + return YAFFS_FAIL; + + if (!nand_chunk) + /* Dummy insert, bail now */ + return YAFFS_OK; + + existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk); + + if (in_scan != 0) { + /* If we're scanning then we need to test for duplicates + * NB This does not need to be efficient since it should only + * happen when the power fails during a write, then only one + * chunk should ever be affected. + * + * Correction for YAFFS2: This could happen quite a lot and we + * need to think about efficiency! TODO + * Update: For backward scanning we don't need to re-read tags + * so this is quite cheap. + */ + + if (existing_cunk > 0) { + /* NB Right now existing chunk will not be real + * chunk_id if the chunk group size > 1 + * thus we have to do a FindChunkInFile to get the + * real chunk id. + * + * We have a duplicate now we need to decide which + * one to use: + * + * Backwards scanning YAFFS2: The old one is what + * we use, dump the new one. + * YAFFS1: Get both sets of tags and compare serial + * numbers. + */ + + if (in_scan > 0) { + /* Only do this for forward scanning */ + yaffs_rd_chunk_tags_nand(dev, + nand_chunk, + NULL, &new_tags); + + /* Do a proper find */ + existing_cunk = + yaffs_find_chunk_in_file(in, inode_chunk, + &existing_tags); + } + + if (existing_cunk <= 0) { + /*Hoosterman - how did this happen? */ + + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy: existing chunk < 0 in scan" + ); + + } + + /* NB The deleted flags should be false, otherwise + * the chunks will not be loaded during a scan + */ + + if (in_scan > 0) { + new_serial = new_tags.serial_number; + existing_serial = existing_tags.serial_number; + } + + if ((in_scan > 0) && + (existing_cunk <= 0 || + ((existing_serial + 1) & 3) == new_serial)) { + /* Forward scanning. + * Use new + * Delete the old one and drop through to + * update the tnode + */ + yaffs_chunk_del(dev, existing_cunk, 1, + __LINE__); + } else { + /* Backward scanning or we want to use the + * existing one + * Delete the new one and return early so that + * the tnode isn't changed + */ + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + return YAFFS_OK; + } + } + + } + + if (existing_cunk == 0) + in->n_data_chunks++; + + yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk); + + return YAFFS_OK; +} + +static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk) +{ + struct yaffs_block_info *the_block; + unsigned block_no; + + yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk); + + block_no = chunk / dev->param.chunks_per_block; + the_block = yaffs_get_block_info(dev, block_no); + if (the_block) { + the_block->soft_del_pages++; + dev->n_free_chunks++; + yaffs2_update_oldest_dirty_seq(dev, block_no, the_block); + } +} + +/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all + * the chunks in the file. + * All soft deleting does is increment the block's softdelete count and pulls + * the chunk out of the tnode. + * Thus, essentially this is the same as DeleteWorker except that the chunks + * are soft deleted. + */ + +static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn, + u32 level, int chunk_offset) +{ + int i; + int the_chunk; + int all_done = 1; + struct yaffs_dev *dev = in->my_dev; + + if (!tn) + return 1; + + if (level > 0) { + for (i = YAFFS_NTNODES_INTERNAL - 1; + all_done && i >= 0; + i--) { + if (tn->internal[i]) { + all_done = + yaffs_soft_del_worker(in, + tn->internal[i], + level - 1, + (chunk_offset << + YAFFS_TNODES_INTERNAL_BITS) + + i); + if (all_done) { + yaffs_free_tnode(dev, + tn->internal[i]); + tn->internal[i] = NULL; + } else { + /* Can this happen? */ + } + } + } + return (all_done) ? 1 : 0; + } + + /* level 0 */ + for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) { + the_chunk = yaffs_get_group_base(dev, tn, i); + if (the_chunk) { + yaffs_soft_del_chunk(dev, the_chunk); + yaffs_load_tnode_0(dev, tn, i, 0); + } + } + return 1; +} + +static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj) +{ + struct yaffs_dev *dev = obj->my_dev; + struct yaffs_obj *parent; + + yaffs_verify_obj_in_dir(obj); + parent = obj->parent; + + yaffs_verify_dir(parent); + + if (dev && dev->param.remove_obj_fn) + dev->param.remove_obj_fn(obj); + + list_del_init(&obj->siblings); + obj->parent = NULL; + + yaffs_verify_dir(parent); +} + +void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj) +{ + if (!directory) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "tragedy: Trying to add an object to a null pointer directory" + ); + BUG(); + return; + } + if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "tragedy: Trying to add an object to a non-directory" + ); + BUG(); + } + + if (obj->siblings.prev == NULL) { + /* Not initialised */ + BUG(); + } + + yaffs_verify_dir(directory); + + yaffs_remove_obj_from_dir(obj); + + /* Now add it */ + list_add(&obj->siblings, &directory->variant.dir_variant.children); + obj->parent = directory; + + if (directory == obj->my_dev->unlinked_dir + || directory == obj->my_dev->del_dir) { + obj->unlinked = 1; + obj->my_dev->n_unlinked_files++; + obj->rename_allowed = 0; + } + + yaffs_verify_dir(directory); + yaffs_verify_obj_in_dir(obj); +} + +static int yaffs_change_obj_name(struct yaffs_obj *obj, + struct yaffs_obj *new_dir, + const YCHAR *new_name, int force, int shadows) +{ + int unlink_op; + int del_op; + struct yaffs_obj *existing_target; + + if (new_dir == NULL) + new_dir = obj->parent; /* use the old directory */ + + if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "tragedy: yaffs_change_obj_name: new_dir is not a directory" + ); + BUG(); + } + + unlink_op = (new_dir == obj->my_dev->unlinked_dir); + del_op = (new_dir == obj->my_dev->del_dir); + + existing_target = yaffs_find_by_name(new_dir, new_name); + + /* If the object is a file going into the unlinked directory, + * then it is OK to just stuff it in since duplicate names are OK. + * else only proceed if the new name does not exist and we're putting + * it into a directory. + */ + if (!(unlink_op || del_op || force || + shadows > 0 || !existing_target) || + new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + return YAFFS_FAIL; + + yaffs_set_obj_name(obj, new_name); + obj->dirty = 1; + yaffs_add_obj_to_dir(new_dir, obj); + + if (unlink_op) + obj->unlinked = 1; + + /* If it is a deletion then we mark it as a shrink for gc */ + if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0) + return YAFFS_OK; + + return YAFFS_FAIL; +} + +/*------------------------ Short Operations Cache ------------------------------ + * In many situations where there is no high level buffering a lot of + * reads might be short sequential reads, and a lot of writes may be short + * sequential writes. eg. scanning/writing a jpeg file. + * In these cases, a short read/write cache can provide a huge perfomance + * benefit with dumb-as-a-rock code. + * In Linux, the page cache provides read buffering and the short op cache + * provides write buffering. + * + * There are a small number (~10) of cache chunks per device so that we don't + * need a very intelligent search. + */ + +static int yaffs_obj_cache_dirty(struct yaffs_obj *obj) +{ + struct yaffs_dev *dev = obj->my_dev; + int i; + struct yaffs_cache *cache; + int n_caches = obj->my_dev->param.n_caches; + + for (i = 0; i < n_caches; i++) { + cache = &dev->cache[i]; + if (cache->object == obj && cache->dirty) + return 1; + } + + return 0; +} + +static void yaffs_flush_file_cache(struct yaffs_obj *obj) +{ + struct yaffs_dev *dev = obj->my_dev; + int lowest = -99; /* Stop compiler whining. */ + int i; + struct yaffs_cache *cache; + int chunk_written = 0; + int n_caches = obj->my_dev->param.n_caches; + + if (n_caches < 1) + return; + do { + cache = NULL; + + /* Find the lowest dirty chunk for this object */ + for (i = 0; i < n_caches; i++) { + if (dev->cache[i].object == obj && + dev->cache[i].dirty) { + if (!cache || + dev->cache[i].chunk_id < lowest) { + cache = &dev->cache[i]; + lowest = cache->chunk_id; + } + } + } + + if (cache && !cache->locked) { + /* Write it out and free it up */ + chunk_written = + yaffs_wr_data_obj(cache->object, + cache->chunk_id, + cache->data, + cache->n_bytes, 1); + cache->dirty = 0; + cache->object = NULL; + } + } while (cache && chunk_written > 0); + + if (cache) + /* Hoosterman, disk full while writing cache out. */ + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy: no space during cache write"); +} + +/*yaffs_flush_whole_cache(dev) + * + * + */ + +void yaffs_flush_whole_cache(struct yaffs_dev *dev) +{ + struct yaffs_obj *obj; + int n_caches = dev->param.n_caches; + int i; + + /* Find a dirty object in the cache and flush it... + * until there are no further dirty objects. + */ + do { + obj = NULL; + for (i = 0; i < n_caches && !obj; i++) { + if (dev->cache[i].object && dev->cache[i].dirty) + obj = dev->cache[i].object; + } + if (obj) + yaffs_flush_file_cache(obj); + } while (obj); + +} + +/* Grab us a cache chunk for use. + * First look for an empty one. + * Then look for the least recently used non-dirty one. + * Then look for the least recently used dirty one...., flush and look again. + */ +static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev) +{ + int i; + + if (dev->param.n_caches > 0) { + for (i = 0; i < dev->param.n_caches; i++) { + if (!dev->cache[i].object) + return &dev->cache[i]; + } + } + return NULL; +} + +static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev) +{ + struct yaffs_cache *cache; + struct yaffs_obj *the_obj; + int usage; + int i; + int pushout; + + if (dev->param.n_caches < 1) + return NULL; + + /* Try find a non-dirty one... */ + + cache = yaffs_grab_chunk_worker(dev); + + if (!cache) { + /* They were all dirty, find the LRU object and flush + * its cache, then find again. + * NB what's here is not very accurate, + * we actually flush the object with the LRU chunk. + */ + + /* With locking we can't assume we can use entry zero, + * Set the_obj to a valid pointer for Coverity. */ + the_obj = dev->cache[0].object; + usage = -1; + cache = NULL; + pushout = -1; + + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object && + !dev->cache[i].locked && + (dev->cache[i].last_use < usage || + !cache)) { + usage = dev->cache[i].last_use; + the_obj = dev->cache[i].object; + cache = &dev->cache[i]; + pushout = i; + } + } + + if (!cache || cache->dirty) { + /* Flush and try again */ + yaffs_flush_file_cache(the_obj); + cache = yaffs_grab_chunk_worker(dev); + } + } + return cache; +} + +/* Find a cached chunk */ +static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj, + int chunk_id) +{ + struct yaffs_dev *dev = obj->my_dev; + int i; + + if (dev->param.n_caches < 1) + return NULL; + + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object == obj && + dev->cache[i].chunk_id == chunk_id) { + dev->cache_hits++; + + return &dev->cache[i]; + } + } + return NULL; +} + +/* Mark the chunk for the least recently used algorithym */ +static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache, + int is_write) +{ + int i; + + if (dev->param.n_caches < 1) + return; + + if (dev->cache_last_use < 0 || + dev->cache_last_use > 100000000) { + /* Reset the cache usages */ + for (i = 1; i < dev->param.n_caches; i++) + dev->cache[i].last_use = 0; + + dev->cache_last_use = 0; + } + dev->cache_last_use++; + cache->last_use = dev->cache_last_use; + + if (is_write) + cache->dirty = 1; +} + +/* Invalidate a single cache page. + * Do this when a whole page gets written, + * ie the short cache for this page is no longer valid. + */ +static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id) +{ + struct yaffs_cache *cache; + + if (object->my_dev->param.n_caches > 0) { + cache = yaffs_find_chunk_cache(object, chunk_id); + + if (cache) + cache->object = NULL; + } +} + +/* Invalidate all the cache pages associated with this object + * Do this whenever ther file is deleted or resized. + */ +static void yaffs_invalidate_whole_cache(struct yaffs_obj *in) +{ + int i; + struct yaffs_dev *dev = in->my_dev; + + if (dev->param.n_caches > 0) { + /* Invalidate it. */ + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object == in) + dev->cache[i].object = NULL; + } + } +} + +static void yaffs_unhash_obj(struct yaffs_obj *obj) +{ + int bucket; + struct yaffs_dev *dev = obj->my_dev; + + /* If it is still linked into the bucket list, free from the list */ + if (!list_empty(&obj->hash_link)) { + list_del_init(&obj->hash_link); + bucket = yaffs_hash_fn(obj->obj_id); + dev->obj_bucket[bucket].count--; + } +} + +/* FreeObject frees up a Object and puts it back on the free list */ +static void yaffs_free_obj(struct yaffs_obj *obj) +{ + struct yaffs_dev *dev; + + if (!obj) { + BUG(); + return; + } + dev = obj->my_dev; + yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p", + obj, obj->my_inode); + if (obj->parent) + BUG(); + if (!list_empty(&obj->siblings)) + BUG(); + + if (obj->my_inode) { + /* We're still hooked up to a cached inode. + * Don't delete now, but mark for later deletion + */ + obj->defered_free = 1; + return; + } + + yaffs_unhash_obj(obj); + + yaffs_free_raw_obj(dev, obj); + dev->n_obj--; + dev->checkpoint_blocks_required = 0; /* force recalculation */ +} + +void yaffs_handle_defered_free(struct yaffs_obj *obj) +{ + if (obj->defered_free) + yaffs_free_obj(obj); +} + +static int yaffs_generic_obj_del(struct yaffs_obj *in) +{ + /* Iinvalidate the file's data in the cache, without flushing. */ + yaffs_invalidate_whole_cache(in); + + if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) { + /* Move to unlinked directory so we have a deletion record */ + yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, + 0); + } + + yaffs_remove_obj_from_dir(in); + yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__); + in->hdr_chunk = 0; + + yaffs_free_obj(in); + return YAFFS_OK; + +} + +static void yaffs_soft_del_file(struct yaffs_obj *obj) +{ + if (!obj->deleted || + obj->variant_type != YAFFS_OBJECT_TYPE_FILE || + obj->soft_del) + return; + + if (obj->n_data_chunks <= 0) { + /* Empty file with no duplicate object headers, + * just delete it immediately */ + yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top); + obj->variant.file_variant.top = NULL; + yaffs_trace(YAFFS_TRACE_TRACING, + "yaffs: Deleting empty file %d", + obj->obj_id); + yaffs_generic_obj_del(obj); + } else { + yaffs_soft_del_worker(obj, + obj->variant.file_variant.top, + obj->variant. + file_variant.top_level, 0); + obj->soft_del = 1; + } +} + +/* Pruning removes any part of the file structure tree that is beyond the + * bounds of the file (ie that does not point to chunks). + * + * A file should only get pruned when its size is reduced. + * + * Before pruning, the chunks must be pulled from the tree and the + * level 0 tnode entries must be zeroed out. + * Could also use this for file deletion, but that's probably better handled + * by a special case. + * + * This function is recursive. For levels > 0 the function is called again on + * any sub-tree. For level == 0 we just check if the sub-tree has data. + * If there is no data in a subtree then it is pruned. + */ + +static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev, + struct yaffs_tnode *tn, u32 level, + int del0) +{ + int i; + int has_data; + + if (!tn) + return tn; + + has_data = 0; + + if (level > 0) { + for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) { + tn->internal[i] = + yaffs_prune_worker(dev, + tn->internal[i], + level - 1, + (i == 0) ? del0 : 1); + } + + if (tn->internal[i]) + has_data++; + } + } else { + int tnode_size_u32 = dev->tnode_size / sizeof(u32); + u32 *map = (u32 *) tn; + + for (i = 0; !has_data && i < tnode_size_u32; i++) { + if (map[i]) + has_data++; + } + } + + if (has_data == 0 && del0) { + /* Free and return NULL */ + yaffs_free_tnode(dev, tn); + tn = NULL; + } + return tn; +} + +static int yaffs_prune_tree(struct yaffs_dev *dev, + struct yaffs_file_var *file_struct) +{ + int i; + int has_data; + int done = 0; + struct yaffs_tnode *tn; + + if (file_struct->top_level < 1) + return YAFFS_OK; + + file_struct->top = + yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0); + + /* Now we have a tree with all the non-zero branches NULL but + * the height is the same as it was. + * Let's see if we can trim internal tnodes to shorten the tree. + * We can do this if only the 0th element in the tnode is in use + * (ie all the non-zero are NULL) + */ + + while (file_struct->top_level && !done) { + tn = file_struct->top; + + has_data = 0; + for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) + has_data++; + } + + if (!has_data) { + file_struct->top = tn->internal[0]; + file_struct->top_level--; + yaffs_free_tnode(dev, tn); + } else { + done = 1; + } + } + + return YAFFS_OK; +} + +/*-------------------- End of File Structure functions.-------------------*/ + +/* alloc_empty_obj gets us a clean Object.*/ +static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev) +{ + struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev); + + if (!obj) + return obj; + + dev->n_obj++; + + /* Now sweeten it up... */ + + memset(obj, 0, sizeof(struct yaffs_obj)); + obj->being_created = 1; + + obj->my_dev = dev; + obj->hdr_chunk = 0; + obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN; + INIT_LIST_HEAD(&(obj->hard_links)); + INIT_LIST_HEAD(&(obj->hash_link)); + INIT_LIST_HEAD(&obj->siblings); + + /* Now make the directory sane */ + if (dev->root_dir) { + obj->parent = dev->root_dir; + list_add(&(obj->siblings), + &dev->root_dir->variant.dir_variant.children); + } + + /* Add it to the lost and found directory. + * NB Can't put root or lost-n-found in lost-n-found so + * check if lost-n-found exists first + */ + if (dev->lost_n_found) + yaffs_add_obj_to_dir(dev->lost_n_found, obj); + + obj->being_created = 0; + + dev->checkpoint_blocks_required = 0; /* force recalculation */ + + return obj; +} + +static int yaffs_find_nice_bucket(struct yaffs_dev *dev) +{ + int i; + int l = 999; + int lowest = 999999; + + /* Search for the shortest list or one that + * isn't too long. + */ + + for (i = 0; i < 10 && lowest > 4; i++) { + dev->bucket_finder++; + dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS; + if (dev->obj_bucket[dev->bucket_finder].count < lowest) { + lowest = dev->obj_bucket[dev->bucket_finder].count; + l = dev->bucket_finder; + } + } + + return l; +} + +static int yaffs_new_obj_id(struct yaffs_dev *dev) +{ + int bucket = yaffs_find_nice_bucket(dev); + int found = 0; + struct list_head *i; + u32 n = (u32) bucket; + + /* Now find an object value that has not already been taken + * by scanning the list. + */ + + while (!found) { + found = 1; + n += YAFFS_NOBJECT_BUCKETS; + if (1 || dev->obj_bucket[bucket].count > 0) { + list_for_each(i, &dev->obj_bucket[bucket].list) { + /* If there is already one in the list */ + if (i && list_entry(i, struct yaffs_obj, + hash_link)->obj_id == n) { + found = 0; + } + } + } + } + return n; +} + +static void yaffs_hash_obj(struct yaffs_obj *in) +{ + int bucket = yaffs_hash_fn(in->obj_id); + struct yaffs_dev *dev = in->my_dev; + + list_add(&in->hash_link, &dev->obj_bucket[bucket].list); + dev->obj_bucket[bucket].count++; +} + +struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number) +{ + int bucket = yaffs_hash_fn(number); + struct list_head *i; + struct yaffs_obj *in; + + list_for_each(i, &dev->obj_bucket[bucket].list) { + /* Look if it is in the list */ + in = list_entry(i, struct yaffs_obj, hash_link); + if (in->obj_id == number) { + /* Don't show if it is defered free */ + if (in->defered_free) + return NULL; + return in; + } + } + + return NULL; +} + +static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number, + enum yaffs_obj_type type) +{ + struct yaffs_obj *the_obj = NULL; + struct yaffs_tnode *tn = NULL; + + if (number < 0) + number = yaffs_new_obj_id(dev); + + if (type == YAFFS_OBJECT_TYPE_FILE) { + tn = yaffs_get_tnode(dev); + if (!tn) + return NULL; + } + + the_obj = yaffs_alloc_empty_obj(dev); + if (!the_obj) { + if (tn) + yaffs_free_tnode(dev, tn); + return NULL; + } + + the_obj->fake = 0; + the_obj->rename_allowed = 1; + the_obj->unlink_allowed = 1; + the_obj->obj_id = number; + yaffs_hash_obj(the_obj); + the_obj->variant_type = type; + yaffs_load_current_time(the_obj, 1, 1); + + switch (type) { + case YAFFS_OBJECT_TYPE_FILE: + the_obj->variant.file_variant.file_size = 0; + the_obj->variant.file_variant.scanned_size = 0; + the_obj->variant.file_variant.shrink_size = + yaffs_max_file_size(dev); + the_obj->variant.file_variant.top_level = 0; + the_obj->variant.file_variant.top = tn; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + INIT_LIST_HEAD(&the_obj->variant.dir_variant.children); + INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_SPECIAL: + /* No action required */ + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* todo this should not happen */ + break; + } + return the_obj; +} + +static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev, + int number, u32 mode) +{ + + struct yaffs_obj *obj = + yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); + + if (!obj) + return NULL; + + obj->fake = 1; /* it is fake so it might not use NAND */ + obj->rename_allowed = 0; + obj->unlink_allowed = 0; + obj->deleted = 0; + obj->unlinked = 0; + obj->yst_mode = mode; + obj->my_dev = dev; + obj->hdr_chunk = 0; /* Not a valid chunk. */ + return obj; + +} + + +static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev) +{ + int i; + + dev->n_obj = 0; + dev->n_tnodes = 0; + yaffs_init_raw_tnodes_and_objs(dev); + + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + INIT_LIST_HEAD(&dev->obj_bucket[i].list); + dev->obj_bucket[i].count = 0; + } +} + +struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev, + int number, + enum yaffs_obj_type type) +{ + struct yaffs_obj *the_obj = NULL; + + if (number > 0) + the_obj = yaffs_find_by_number(dev, number); + + if (!the_obj) + the_obj = yaffs_new_obj(dev, number, type); + + return the_obj; + +} + +YCHAR *yaffs_clone_str(const YCHAR *str) +{ + YCHAR *new_str = NULL; + int len; + + if (!str) + str = _Y(""); + + len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH); + new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS); + if (new_str) { + strncpy(new_str, str, len); + new_str[len] = 0; + } + return new_str; + +} +/* + *yaffs_update_parent() handles fixing a directories mtime and ctime when a new + * link (ie. name) is created or deleted in the directory. + * + * ie. + * create dir/a : update dir's mtime/ctime + * rm dir/a: update dir's mtime/ctime + * modify dir/a: don't update dir's mtimme/ctime + * + * This can be handled immediately or defered. Defering helps reduce the number + * of updates when many files in a directory are changed within a brief period. + * + * If the directory updating is defered then yaffs_update_dirty_dirs must be + * called periodically. + */ + +static void yaffs_update_parent(struct yaffs_obj *obj) +{ + struct yaffs_dev *dev; + + if (!obj) + return; + dev = obj->my_dev; + obj->dirty = 1; + yaffs_load_current_time(obj, 0, 1); + if (dev->param.defered_dir_update) { + struct list_head *link = &obj->variant.dir_variant.dirty; + + if (list_empty(link)) { + list_add(link, &dev->dirty_dirs); + yaffs_trace(YAFFS_TRACE_BACKGROUND, + "Added object %d to dirty directories", + obj->obj_id); + } + + } else { + yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); + } +} + +void yaffs_update_dirty_dirs(struct yaffs_dev *dev) +{ + struct list_head *link; + struct yaffs_obj *obj; + struct yaffs_dir_var *d_s; + union yaffs_obj_var *o_v; + + yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories"); + + while (!list_empty(&dev->dirty_dirs)) { + link = dev->dirty_dirs.next; + list_del_init(link); + + d_s = list_entry(link, struct yaffs_dir_var, dirty); + o_v = list_entry(d_s, union yaffs_obj_var, dir_variant); + obj = list_entry(o_v, struct yaffs_obj, variant); + + yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d", + obj->obj_id); + + if (obj->dirty) + yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); + } +} + +/* + * Mknod (create) a new object. + * equiv_obj only has meaning for a hard link; + * alias_str only has meaning for a symlink. + * rdev only has meaning for devices (a subset of special objects) + */ + +static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type, + struct yaffs_obj *parent, + const YCHAR *name, + u32 mode, + u32 uid, + u32 gid, + struct yaffs_obj *equiv_obj, + const YCHAR *alias_str, u32 rdev) +{ + struct yaffs_obj *in; + YCHAR *str = NULL; + struct yaffs_dev *dev = parent->my_dev; + + /* Check if the entry exists. + * If it does then fail the call since we don't want a dup. */ + if (yaffs_find_by_name(parent, name)) + return NULL; + + if (type == YAFFS_OBJECT_TYPE_SYMLINK) { + str = yaffs_clone_str(alias_str); + if (!str) + return NULL; + } + + in = yaffs_new_obj(dev, -1, type); + + if (!in) { + kfree(str); + return NULL; + } + + in->hdr_chunk = 0; + in->valid = 1; + in->variant_type = type; + + in->yst_mode = mode; + + yaffs_attribs_init(in, gid, uid, rdev); + + in->n_data_chunks = 0; + + yaffs_set_obj_name(in, name); + in->dirty = 1; + + yaffs_add_obj_to_dir(parent, in); + + in->my_dev = parent->my_dev; + + switch (type) { + case YAFFS_OBJECT_TYPE_SYMLINK: + in->variant.symlink_variant.alias = str; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardlink_variant.equiv_obj = equiv_obj; + in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id; + list_add(&in->hard_links, &equiv_obj->hard_links); + break; + case YAFFS_OBJECT_TYPE_FILE: + case YAFFS_OBJECT_TYPE_DIRECTORY: + case YAFFS_OBJECT_TYPE_SPECIAL: + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* do nothing */ + break; + } + + if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) { + /* Could not create the object header, fail */ + yaffs_del_obj(in); + in = NULL; + } + + if (in) + yaffs_update_parent(parent); + + return in; +} + +struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, + const YCHAR *name, u32 mode, u32 uid, + u32 gid) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, + uid, gid, NULL, NULL, 0); +} + +struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name, + u32 mode, u32 uid, u32 gid) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, + mode, uid, gid, NULL, NULL, 0); +} + +struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, + const YCHAR *name, u32 mode, u32 uid, + u32 gid, u32 rdev) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, + uid, gid, NULL, NULL, rdev); +} + +struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, + const YCHAR *name, u32 mode, u32 uid, + u32 gid, const YCHAR *alias) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, + uid, gid, NULL, alias, 0); +} + +/* yaffs_link_obj returns the object id of the equivalent object.*/ +struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name, + struct yaffs_obj *equiv_obj) +{ + /* Get the real object in case we were fed a hard link obj */ + equiv_obj = yaffs_get_equivalent_obj(equiv_obj); + + if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK, + parent, name, 0, 0, 0, + equiv_obj, NULL, 0)) + return equiv_obj; + + return NULL; + +} + + + +/*---------------------- Block Management and Page Allocation -------------*/ + +static void yaffs_deinit_blocks(struct yaffs_dev *dev) +{ + if (dev->block_info_alt && dev->block_info) + vfree(dev->block_info); + else + kfree(dev->block_info); + + dev->block_info_alt = 0; + + dev->block_info = NULL; + + if (dev->chunk_bits_alt && dev->chunk_bits) + vfree(dev->chunk_bits); + else + kfree(dev->chunk_bits); + dev->chunk_bits_alt = 0; + dev->chunk_bits = NULL; +} + +static int yaffs_init_blocks(struct yaffs_dev *dev) +{ + int n_blocks = dev->internal_end_block - dev->internal_start_block + 1; + + dev->block_info = NULL; + dev->chunk_bits = NULL; + dev->alloc_block = -1; /* force it to get a new one */ + + /* If the first allocation strategy fails, thry the alternate one */ + dev->block_info = + kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS); + if (!dev->block_info) { + dev->block_info = + vmalloc(n_blocks * sizeof(struct yaffs_block_info)); + dev->block_info_alt = 1; + } else { + dev->block_info_alt = 0; + } + + if (!dev->block_info) + goto alloc_error; + + /* Set up dynamic blockinfo stuff. Round up bytes. */ + dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; + dev->chunk_bits = + kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS); + if (!dev->chunk_bits) { + dev->chunk_bits = + vmalloc(dev->chunk_bit_stride * n_blocks); + dev->chunk_bits_alt = 1; + } else { + dev->chunk_bits_alt = 0; + } + if (!dev->chunk_bits) + goto alloc_error; + + + memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info)); + memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks); + return YAFFS_OK; + +alloc_error: + yaffs_deinit_blocks(dev); + return YAFFS_FAIL; +} + + +void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no) +{ + struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no); + int erased_ok = 0; + int i; + + /* If the block is still healthy erase it and mark as clean. + * If the block has had a data failure, then retire it. + */ + + yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, + "yaffs_block_became_dirty block %d state %d %s", + block_no, bi->block_state, + (bi->needs_retiring) ? "needs retiring" : ""); + + yaffs2_clear_oldest_dirty_seq(dev, bi); + + bi->block_state = YAFFS_BLOCK_STATE_DIRTY; + + /* If this is the block being garbage collected then stop gc'ing */ + if (block_no == dev->gc_block) + dev->gc_block = 0; + + /* If this block is currently the best candidate for gc + * then drop as a candidate */ + if (block_no == dev->gc_dirtiest) { + dev->gc_dirtiest = 0; + dev->gc_pages_in_use = 0; + } + + if (!bi->needs_retiring) { + yaffs2_checkpt_invalidate(dev); + erased_ok = yaffs_erase_block(dev, block_no); + if (!erased_ok) { + dev->n_erase_failures++; + yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + "**>> Erasure failed %d", block_no); + } + } + + /* Verify erasure if needed */ + if (erased_ok && + ((yaffs_trace_mask & YAFFS_TRACE_ERASE) || + !yaffs_skip_verification(dev))) { + for (i = 0; i < dev->param.chunks_per_block; i++) { + if (!yaffs_check_chunk_erased(dev, + block_no * dev->param.chunks_per_block + i)) { + yaffs_trace(YAFFS_TRACE_ERROR, + ">>Block %d erasure supposedly OK, but chunk %d not erased", + block_no, i); + } + } + } + + if (!erased_ok) { + /* We lost a block of free space */ + dev->n_free_chunks -= dev->param.chunks_per_block; + yaffs_retire_block(dev, block_no); + yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + "**>> Block %d retired", block_no); + return; + } + + /* Clean it up... */ + bi->block_state = YAFFS_BLOCK_STATE_EMPTY; + bi->seq_number = 0; + dev->n_erased_blocks++; + bi->pages_in_use = 0; + bi->soft_del_pages = 0; + bi->has_shrink_hdr = 0; + bi->skip_erased_check = 1; /* Clean, so no need to check */ + bi->gc_prioritise = 0; + bi->has_summary = 0; + + yaffs_clear_chunk_bits(dev, block_no); + + yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no); +} + +static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev, + struct yaffs_block_info *bi, + int old_chunk, u8 *buffer) +{ + int new_chunk; + int mark_flash = 1; + struct yaffs_ext_tags tags; + struct yaffs_obj *object; + int matching_chunk; + int ret_val = YAFFS_OK; + + memset(&tags, 0, sizeof(tags)); + yaffs_rd_chunk_tags_nand(dev, old_chunk, + buffer, &tags); + object = yaffs_find_by_number(dev, tags.obj_id); + + yaffs_trace(YAFFS_TRACE_GC_DETAIL, + "Collecting chunk in block %d, %d %d %d ", + dev->gc_chunk, tags.obj_id, + tags.chunk_id, tags.n_bytes); + + if (object && !yaffs_skip_verification(dev)) { + if (tags.chunk_id == 0) + matching_chunk = + object->hdr_chunk; + else if (object->soft_del) + /* Defeat the test */ + matching_chunk = old_chunk; + else + matching_chunk = + yaffs_find_chunk_in_file + (object, tags.chunk_id, + NULL); + + if (old_chunk != matching_chunk) + yaffs_trace(YAFFS_TRACE_ERROR, + "gc: page in gc mismatch: %d %d %d %d", + old_chunk, + matching_chunk, + tags.obj_id, + tags.chunk_id); + } + + if (!object) { + yaffs_trace(YAFFS_TRACE_ERROR, + "page %d in gc has no object: %d %d %d ", + old_chunk, + tags.obj_id, tags.chunk_id, + tags.n_bytes); + } + + if (object && + object->deleted && + object->soft_del && tags.chunk_id != 0) { + /* Data chunk in a soft deleted file, + * throw it away. + * It's a soft deleted data chunk, + * No need to copy this, just forget + * about it and fix up the object. + */ + + /* Free chunks already includes + * softdeleted chunks, how ever this + * chunk is going to soon be really + * deleted which will increment free + * chunks. We have to decrement free + * chunks so this works out properly. + */ + dev->n_free_chunks--; + bi->soft_del_pages--; + + object->n_data_chunks--; + if (object->n_data_chunks <= 0) { + /* remeber to clean up obj */ + dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id; + dev->n_clean_ups++; + } + mark_flash = 0; + } else if (object) { + /* It's either a data chunk in a live + * file or an ObjectHeader, so we're + * interested in it. + * NB Need to keep the ObjectHeaders of + * deleted files until the whole file + * has been deleted off + */ + tags.serial_number++; + dev->n_gc_copies++; + + if (tags.chunk_id == 0) { + /* It is an object Id, + * We need to nuke the + * shrinkheader flags since its + * work is done. + * Also need to clean up + * shadowing. + */ + struct yaffs_obj_hdr *oh; + oh = (struct yaffs_obj_hdr *) buffer; + + oh->is_shrink = 0; + tags.extra_is_shrink = 0; + oh->shadows_obj = 0; + oh->inband_shadowed_obj_id = 0; + tags.extra_shadows = 0; + + /* Update file size */ + if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) { + yaffs_oh_size_load(oh, + object->variant.file_variant.file_size); + tags.extra_file_size = + object->variant.file_variant.file_size; + } + + yaffs_verify_oh(object, oh, &tags, 1); + new_chunk = + yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1); + } else { + new_chunk = + yaffs_write_new_chunk(dev, buffer, &tags, 1); + } + + if (new_chunk < 0) { + ret_val = YAFFS_FAIL; + } else { + + /* Now fix up the Tnodes etc. */ + + if (tags.chunk_id == 0) { + /* It's a header */ + object->hdr_chunk = new_chunk; + object->serial = tags.serial_number; + } else { + /* It's a data chunk */ + yaffs_put_chunk_in_file(object, tags.chunk_id, + new_chunk, 0); + } + } + } + if (ret_val == YAFFS_OK) + yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__); + return ret_val; +} + +static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block) +{ + int old_chunk; + int ret_val = YAFFS_OK; + int i; + int is_checkpt_block; + int max_copies; + int chunks_before = yaffs_get_erased_chunks(dev); + int chunks_after; + struct yaffs_block_info *bi = yaffs_get_block_info(dev, block); + + is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT); + + yaffs_trace(YAFFS_TRACE_TRACING, + "Collecting block %d, in use %d, shrink %d, whole_block %d", + block, bi->pages_in_use, bi->has_shrink_hdr, + whole_block); + + /*yaffs_verify_free_chunks(dev); */ + + if (bi->block_state == YAFFS_BLOCK_STATE_FULL) + bi->block_state = YAFFS_BLOCK_STATE_COLLECTING; + + bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */ + + dev->gc_disable = 1; + + yaffs_summary_gc(dev, block); + + if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) { + yaffs_trace(YAFFS_TRACE_TRACING, + "Collecting block %d that has no chunks in use", + block); + yaffs_block_became_dirty(dev, block); + } else { + + u8 *buffer = yaffs_get_temp_buffer(dev); + + yaffs_verify_blk(dev, bi, block); + + max_copies = (whole_block) ? dev->param.chunks_per_block : 5; + old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk; + + for (/* init already done */ ; + ret_val == YAFFS_OK && + dev->gc_chunk < dev->param.chunks_per_block && + (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) && + max_copies > 0; + dev->gc_chunk++, old_chunk++) { + if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) { + /* Page is in use and might need to be copied */ + max_copies--; + ret_val = yaffs_gc_process_chunk(dev, bi, + old_chunk, buffer); + } + } + yaffs_release_temp_buffer(dev, buffer); + } + + yaffs_verify_collected_blk(dev, bi, block); + + if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { + /* + * The gc did not complete. Set block state back to FULL + * because checkpointing does not restore gc. + */ + bi->block_state = YAFFS_BLOCK_STATE_FULL; + } else { + /* The gc completed. */ + /* Do any required cleanups */ + for (i = 0; i < dev->n_clean_ups; i++) { + /* Time to delete the file too */ + struct yaffs_obj *object = + yaffs_find_by_number(dev, dev->gc_cleanup_list[i]); + if (object) { + yaffs_free_tnode(dev, + object->variant.file_variant.top); + object->variant.file_variant.top = NULL; + yaffs_trace(YAFFS_TRACE_GC, + "yaffs: About to finally delete object %d", + object->obj_id); + yaffs_generic_obj_del(object); + object->my_dev->n_deleted_files--; + } + + } + chunks_after = yaffs_get_erased_chunks(dev); + if (chunks_before >= chunks_after) + yaffs_trace(YAFFS_TRACE_GC, + "gc did not increase free chunks before %d after %d", + chunks_before, chunks_after); + dev->gc_block = 0; + dev->gc_chunk = 0; + dev->n_clean_ups = 0; + } + + dev->gc_disable = 0; + + return ret_val; +} + +/* + * find_gc_block() selects the dirtiest block (or close enough) + * for garbage collection. + */ + +static unsigned yaffs_find_gc_block(struct yaffs_dev *dev, + int aggressive, int background) +{ + int i; + int iterations; + unsigned selected = 0; + int prioritised = 0; + int prioritised_exist = 0; + struct yaffs_block_info *bi; + int threshold; + + /* First let's see if we need to grab a prioritised block */ + if (dev->has_pending_prioritised_gc && !aggressive) { + dev->gc_dirtiest = 0; + bi = dev->block_info; + for (i = dev->internal_start_block; + i <= dev->internal_end_block && !selected; i++) { + + if (bi->gc_prioritise) { + prioritised_exist = 1; + if (bi->block_state == YAFFS_BLOCK_STATE_FULL && + yaffs_block_ok_for_gc(dev, bi)) { + selected = i; + prioritised = 1; + } + } + bi++; + } + + /* + * If there is a prioritised block and none was selected then + * this happened because there is at least one old dirty block + * gumming up the works. Let's gc the oldest dirty block. + */ + + if (prioritised_exist && + !selected && dev->oldest_dirty_block > 0) + selected = dev->oldest_dirty_block; + + if (!prioritised_exist) /* None found, so we can clear this */ + dev->has_pending_prioritised_gc = 0; + } + + /* If we're doing aggressive GC then we are happy to take a less-dirty + * block, and search harder. + * else (leasurely gc), then we only bother to do this if the + * block has only a few pages in use. + */ + + if (!selected) { + int pages_used; + int n_blocks = + dev->internal_end_block - dev->internal_start_block + 1; + if (aggressive) { + threshold = dev->param.chunks_per_block; + iterations = n_blocks; + } else { + int max_threshold; + + if (background) + max_threshold = dev->param.chunks_per_block / 2; + else + max_threshold = dev->param.chunks_per_block / 8; + + if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD) + max_threshold = YAFFS_GC_PASSIVE_THRESHOLD; + + threshold = background ? (dev->gc_not_done + 2) * 2 : 0; + if (threshold < YAFFS_GC_PASSIVE_THRESHOLD) + threshold = YAFFS_GC_PASSIVE_THRESHOLD; + if (threshold > max_threshold) + threshold = max_threshold; + + iterations = n_blocks / 16 + 1; + if (iterations > 100) + iterations = 100; + } + + for (i = 0; + i < iterations && + (dev->gc_dirtiest < 1 || + dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); + i++) { + dev->gc_block_finder++; + if (dev->gc_block_finder < dev->internal_start_block || + dev->gc_block_finder > dev->internal_end_block) + dev->gc_block_finder = + dev->internal_start_block; + + bi = yaffs_get_block_info(dev, dev->gc_block_finder); + + pages_used = bi->pages_in_use - bi->soft_del_pages; + + if (bi->block_state == YAFFS_BLOCK_STATE_FULL && + pages_used < dev->param.chunks_per_block && + (dev->gc_dirtiest < 1 || + pages_used < dev->gc_pages_in_use) && + yaffs_block_ok_for_gc(dev, bi)) { + dev->gc_dirtiest = dev->gc_block_finder; + dev->gc_pages_in_use = pages_used; + } + } + + if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold) + selected = dev->gc_dirtiest; + } + + /* + * If nothing has been selected for a while, try the oldest dirty + * because that's gumming up the works. + */ + + if (!selected && dev->param.is_yaffs2 && + dev->gc_not_done >= (background ? 10 : 20)) { + yaffs2_find_oldest_dirty_seq(dev); + if (dev->oldest_dirty_block > 0) { + selected = dev->oldest_dirty_block; + dev->gc_dirtiest = selected; + dev->oldest_dirty_gc_count++; + bi = yaffs_get_block_info(dev, selected); + dev->gc_pages_in_use = + bi->pages_in_use - bi->soft_del_pages; + } else { + dev->gc_not_done = 0; + } + } + + if (selected) { + yaffs_trace(YAFFS_TRACE_GC, + "GC Selected block %d with %d free, prioritised:%d", + selected, + dev->param.chunks_per_block - dev->gc_pages_in_use, + prioritised); + + dev->n_gc_blocks++; + if (background) + dev->bg_gcs++; + + dev->gc_dirtiest = 0; + dev->gc_pages_in_use = 0; + dev->gc_not_done = 0; + if (dev->refresh_skip > 0) + dev->refresh_skip--; + } else { + dev->gc_not_done++; + yaffs_trace(YAFFS_TRACE_GC, + "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s", + dev->gc_block_finder, dev->gc_not_done, threshold, + dev->gc_dirtiest, dev->gc_pages_in_use, + dev->oldest_dirty_block, background ? " bg" : ""); + } + + return selected; +} + +/* New garbage collector + * If we're very low on erased blocks then we do aggressive garbage collection + * otherwise we do "leasurely" garbage collection. + * Aggressive gc looks further (whole array) and will accept less dirty blocks. + * Passive gc only inspects smaller areas and only accepts more dirty blocks. + * + * The idea is to help clear out space in a more spread-out manner. + * Dunno if it really does anything useful. + */ +static int yaffs_check_gc(struct yaffs_dev *dev, int background) +{ + int aggressive = 0; + int gc_ok = YAFFS_OK; + int max_tries = 0; + int min_erased; + int erased_chunks; + int checkpt_block_adjust; + + if (dev->param.gc_control_fn && + (dev->param.gc_control_fn(dev) & 1) == 0) + return YAFFS_OK; + + if (dev->gc_disable) + /* Bail out so we don't get recursive gc */ + return YAFFS_OK; + + /* This loop should pass the first time. + * Only loops here if the collection does not increase space. + */ + + do { + max_tries++; + + checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev); + + min_erased = + dev->param.n_reserved_blocks + checkpt_block_adjust + 1; + erased_chunks = + dev->n_erased_blocks * dev->param.chunks_per_block; + + /* If we need a block soon then do aggressive gc. */ + if (dev->n_erased_blocks < min_erased) + aggressive = 1; + else { + if (!background + && erased_chunks > (dev->n_free_chunks / 4)) + break; + + if (dev->gc_skip > 20) + dev->gc_skip = 20; + if (erased_chunks < dev->n_free_chunks / 2 || + dev->gc_skip < 1 || background) + aggressive = 0; + else { + dev->gc_skip--; + break; + } + } + + dev->gc_skip = 5; + + /* If we don't already have a block being gc'd then see if we + * should start another */ + + if (dev->gc_block < 1 && !aggressive) { + dev->gc_block = yaffs2_find_refresh_block(dev); + dev->gc_chunk = 0; + dev->n_clean_ups = 0; + } + if (dev->gc_block < 1) { + dev->gc_block = + yaffs_find_gc_block(dev, aggressive, background); + dev->gc_chunk = 0; + dev->n_clean_ups = 0; + } + + if (dev->gc_block > 0) { + dev->all_gcs++; + if (!aggressive) + dev->passive_gc_count++; + + yaffs_trace(YAFFS_TRACE_GC, + "yaffs: GC n_erased_blocks %d aggressive %d", + dev->n_erased_blocks, aggressive); + + gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive); + } + + if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) && + dev->gc_block > 0) { + yaffs_trace(YAFFS_TRACE_GC, + "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d", + dev->n_erased_blocks, max_tries, + dev->gc_block); + } + } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) && + (dev->gc_block > 0) && (max_tries < 2)); + + return aggressive ? gc_ok : YAFFS_OK; +} + +/* + * yaffs_bg_gc() + * Garbage collects. Intended to be called from a background thread. + * Returns non-zero if at least half the free chunks are erased. + */ +int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency) +{ + int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block; + + yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency); + + yaffs_check_gc(dev, 1); + return erased_chunks > dev->n_free_chunks / 2; +} + +/*-------------------- Data file manipulation -----------------*/ + +static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer) +{ + int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL); + + if (nand_chunk >= 0) + return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk, + buffer, NULL); + else { + yaffs_trace(YAFFS_TRACE_NANDACCESS, + "Chunk %d not found zero instead", + nand_chunk); + /* get sane (zero) data if you read a hole */ + memset(buffer, 0, in->my_dev->data_bytes_per_chunk); + return 0; + } + +} + +void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash, + int lyn) +{ + int block; + int page; + struct yaffs_ext_tags tags; + struct yaffs_block_info *bi; + + if (chunk_id <= 0) + return; + + dev->n_deletions++; + block = chunk_id / dev->param.chunks_per_block; + page = chunk_id % dev->param.chunks_per_block; + + if (!yaffs_check_chunk_bit(dev, block, page)) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Deleting invalid chunk %d", chunk_id); + + bi = yaffs_get_block_info(dev, block); + + yaffs2_update_oldest_dirty_seq(dev, block, bi); + + yaffs_trace(YAFFS_TRACE_DELETION, + "line %d delete of chunk %d", + lyn, chunk_id); + + if (!dev->param.is_yaffs2 && mark_flash && + bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) { + + memset(&tags, 0, sizeof(tags)); + tags.is_deleted = 1; + yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags); + yaffs_handle_chunk_update(dev, chunk_id, &tags); + } else { + dev->n_unmarked_deletions++; + } + + /* Pull out of the management area. + * If the whole block became dirty, this will kick off an erasure. + */ + if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING || + bi->block_state == YAFFS_BLOCK_STATE_FULL || + bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN || + bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { + dev->n_free_chunks++; + yaffs_clear_chunk_bit(dev, block, page); + bi->pages_in_use--; + + if (bi->pages_in_use == 0 && + !bi->has_shrink_hdr && + bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING && + bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) { + yaffs_block_became_dirty(dev, block); + } + } +} + +static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk, + const u8 *buffer, int n_bytes, int use_reserve) +{ + /* Find old chunk Need to do this to get serial number + * Write new one and patch into tree. + * Invalidate old tags. + */ + + int prev_chunk_id; + struct yaffs_ext_tags prev_tags; + int new_chunk_id; + struct yaffs_ext_tags new_tags; + struct yaffs_dev *dev = in->my_dev; + + yaffs_check_gc(dev, 0); + + /* Get the previous chunk at this location in the file if it exists. + * If it does not exist then put a zero into the tree. This creates + * the tnode now, rather than later when it is harder to clean up. + */ + prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags); + if (prev_chunk_id < 1 && + !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0)) + return 0; + + /* Set up new tags */ + memset(&new_tags, 0, sizeof(new_tags)); + + new_tags.chunk_id = inode_chunk; + new_tags.obj_id = in->obj_id; + new_tags.serial_number = + (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1; + new_tags.n_bytes = n_bytes; + + if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) { + yaffs_trace(YAFFS_TRACE_ERROR, + "Writing %d bytes to chunk!!!!!!!!!", + n_bytes); + BUG(); + } + + new_chunk_id = + yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve); + + if (new_chunk_id > 0) { + yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0); + + if (prev_chunk_id > 0) + yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__); + + yaffs_verify_file_sane(in); + } + return new_chunk_id; + +} + + + +static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set, + const YCHAR *name, const void *value, int size, + int flags) +{ + struct yaffs_xattr_mod xmod; + int result; + + xmod.set = set; + xmod.name = name; + xmod.data = value; + xmod.size = size; + xmod.flags = flags; + xmod.result = -ENOSPC; + + result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod); + + if (result > 0) + return xmod.result; + else + return -ENOSPC; +} + +static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer, + struct yaffs_xattr_mod *xmod) +{ + int retval = 0; + int x_offs = sizeof(struct yaffs_obj_hdr); + struct yaffs_dev *dev = obj->my_dev; + int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); + char *x_buffer = buffer + x_offs; + + if (xmod->set) + retval = + nval_set(x_buffer, x_size, xmod->name, xmod->data, + xmod->size, xmod->flags); + else + retval = nval_del(x_buffer, x_size, xmod->name); + + obj->has_xattr = nval_hasvalues(x_buffer, x_size); + obj->xattr_known = 1; + xmod->result = retval; + + return retval; +} + +static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name, + void *value, int size) +{ + char *buffer = NULL; + int result; + struct yaffs_ext_tags tags; + struct yaffs_dev *dev = obj->my_dev; + int x_offs = sizeof(struct yaffs_obj_hdr); + int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); + char *x_buffer; + int retval = 0; + + if (obj->hdr_chunk < 1) + return -ENODATA; + + /* If we know that the object has no xattribs then don't do all the + * reading and parsing. + */ + if (obj->xattr_known && !obj->has_xattr) { + if (name) + return -ENODATA; + else + return 0; + } + + buffer = (char *)yaffs_get_temp_buffer(dev); + if (!buffer) + return -ENOMEM; + + result = + yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags); + + if (result != YAFFS_OK) + retval = -ENOENT; + else { + x_buffer = buffer + x_offs; + + if (!obj->xattr_known) { + obj->has_xattr = nval_hasvalues(x_buffer, x_size); + obj->xattr_known = 1; + } + + if (name) + retval = nval_get(x_buffer, x_size, name, value, size); + else + retval = nval_list(x_buffer, x_size, value, size); + } + yaffs_release_temp_buffer(dev, (u8 *) buffer); + return retval; +} + +int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name, + const void *value, int size, int flags) +{ + return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags); +} + +int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name) +{ + return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0); +} + +int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value, + int size) +{ + return yaffs_do_xattrib_fetch(obj, name, value, size); +} + +int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size) +{ + return yaffs_do_xattrib_fetch(obj, NULL, buffer, size); +} + +static void yaffs_check_obj_details_loaded(struct yaffs_obj *in) +{ + u8 *buf; + struct yaffs_obj_hdr *oh; + struct yaffs_dev *dev; + struct yaffs_ext_tags tags; + int result; + int alloc_failed = 0; + + if (!in || !in->lazy_loaded || in->hdr_chunk < 1) + return; + + dev = in->my_dev; + in->lazy_loaded = 0; + buf = yaffs_get_temp_buffer(dev); + + result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags); + oh = (struct yaffs_obj_hdr *)buf; + + in->yst_mode = oh->yst_mode; + yaffs_load_attribs(in, oh); + yaffs_set_obj_name_from_oh(in, oh); + + if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { + in->variant.symlink_variant.alias = + yaffs_clone_str(oh->alias); + if (!in->variant.symlink_variant.alias) + alloc_failed = 1; /* Not returned */ + } + yaffs_release_temp_buffer(dev, buf); +} + +static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name, + const YCHAR *oh_name, int buff_size) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + if (dev->param.auto_unicode) { + if (*oh_name) { + /* It is an ASCII name, do an ASCII to + * unicode conversion */ + const char *ascii_oh_name = (const char *)oh_name; + int n = buff_size - 1; + while (n > 0 && *ascii_oh_name) { + *name = *ascii_oh_name; + name++; + ascii_oh_name++; + n--; + } + } else { + strncpy(name, oh_name + 1, buff_size - 1); + } + } else { +#else + (void) dev; + { +#endif + strncpy(name, oh_name, buff_size - 1); + } +} + +static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name, + const YCHAR *name) +{ +#ifdef CONFIG_YAFFS_AUTO_UNICODE + + int is_ascii; + YCHAR *w; + + if (dev->param.auto_unicode) { + + is_ascii = 1; + w = name; + + /* Figure out if the name will fit in ascii character set */ + while (is_ascii && *w) { + if ((*w) & 0xff00) + is_ascii = 0; + w++; + } + + if (is_ascii) { + /* It is an ASCII name, so convert unicode to ascii */ + char *ascii_oh_name = (char *)oh_name; + int n = YAFFS_MAX_NAME_LENGTH - 1; + while (n > 0 && *name) { + *ascii_oh_name = *name; + name++; + ascii_oh_name++; + n--; + } + } else { + /* Unicode name, so save starting at the second YCHAR */ + *oh_name = 0; + strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2); + } + } else { +#else + dev = dev; + { +#endif + strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1); + } +} + +/* UpdateObjectHeader updates the header on NAND for an object. + * If name is not NULL, then that new name is used. + */ +int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force, + int is_shrink, int shadows, struct yaffs_xattr_mod *xmod) +{ + + struct yaffs_block_info *bi; + struct yaffs_dev *dev = in->my_dev; + int prev_chunk_id; + int ret_val = 0; + int result = 0; + int new_chunk_id; + struct yaffs_ext_tags new_tags; + struct yaffs_ext_tags old_tags; + const YCHAR *alias = NULL; + u8 *buffer = NULL; + YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1]; + struct yaffs_obj_hdr *oh = NULL; + loff_t file_size = 0; + + strcpy(old_name, _Y("silly old name")); + + if (in->fake && in != dev->root_dir && !force && !xmod) + return ret_val; + + yaffs_check_gc(dev, 0); + yaffs_check_obj_details_loaded(in); + + buffer = yaffs_get_temp_buffer(in->my_dev); + oh = (struct yaffs_obj_hdr *)buffer; + + prev_chunk_id = in->hdr_chunk; + + if (prev_chunk_id > 0) { + result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id, + buffer, &old_tags); + + yaffs_verify_oh(in, oh, &old_tags, 0); + memcpy(old_name, oh->name, sizeof(oh->name)); + memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr)); + } else { + memset(buffer, 0xff, dev->data_bytes_per_chunk); + } + + oh->type = in->variant_type; + oh->yst_mode = in->yst_mode; + oh->shadows_obj = oh->inband_shadowed_obj_id = shadows; + + yaffs_load_attribs_oh(oh, in); + + if (in->parent) + oh->parent_obj_id = in->parent->obj_id; + else + oh->parent_obj_id = 0; + + if (name && *name) { + memset(oh->name, 0, sizeof(oh->name)); + yaffs_load_oh_from_name(dev, oh->name, name); + } else if (prev_chunk_id > 0) { + memcpy(oh->name, old_name, sizeof(oh->name)); + } else { + memset(oh->name, 0, sizeof(oh->name)); + } + + oh->is_shrink = is_shrink; + + switch (in->variant_type) { + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* Should not happen */ + break; + case YAFFS_OBJECT_TYPE_FILE: + if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED && + oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED) + file_size = in->variant.file_variant.file_size; + yaffs_oh_size_load(oh, file_size); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + oh->equiv_id = in->variant.hardlink_variant.equiv_id; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + alias = in->variant.symlink_variant.alias; + if (!alias) + alias = _Y("no alias"); + strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH); + oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; + break; + } + + /* process any xattrib modifications */ + if (xmod) + yaffs_apply_xattrib_mod(in, (char *)buffer, xmod); + + /* Tags */ + memset(&new_tags, 0, sizeof(new_tags)); + in->serial++; + new_tags.chunk_id = 0; + new_tags.obj_id = in->obj_id; + new_tags.serial_number = in->serial; + + /* Add extra info for file header */ + new_tags.extra_available = 1; + new_tags.extra_parent_id = oh->parent_obj_id; + new_tags.extra_file_size = file_size; + new_tags.extra_is_shrink = oh->is_shrink; + new_tags.extra_equiv_id = oh->equiv_id; + new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0; + new_tags.extra_obj_type = in->variant_type; + yaffs_verify_oh(in, oh, &new_tags, 1); + + /* Create new chunk in NAND */ + new_chunk_id = + yaffs_write_new_chunk(dev, buffer, &new_tags, + (prev_chunk_id > 0) ? 1 : 0); + + if (buffer) + yaffs_release_temp_buffer(dev, buffer); + + if (new_chunk_id < 0) + return new_chunk_id; + + in->hdr_chunk = new_chunk_id; + + if (prev_chunk_id > 0) + yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__); + + if (!yaffs_obj_cache_dirty(in)) + in->dirty = 0; + + /* If this was a shrink, then mark the block + * that the chunk lives on */ + if (is_shrink) { + bi = yaffs_get_block_info(in->my_dev, + new_chunk_id / + in->my_dev->param.chunks_per_block); + bi->has_shrink_hdr = 1; + } + + + return new_chunk_id; +} + +/*--------------------- File read/write ------------------------ + * Read and write have very similar structures. + * In general the read/write has three parts to it + * An incomplete chunk to start with (if the read/write is not chunk-aligned) + * Some complete chunks + * An incomplete chunk to end off with + * + * Curve-balls: the first chunk might also be the last chunk. + */ + +int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes) +{ + int chunk; + u32 start; + int n_copy; + int n = n_bytes; + int n_done = 0; + struct yaffs_cache *cache; + struct yaffs_dev *dev; + + dev = in->my_dev; + + while (n > 0) { + yaffs_addr_to_chunk(dev, offset, &chunk, &start); + chunk++; + + /* OK now check for the curveball where the start and end are in + * the same chunk. + */ + if ((start + n) < dev->data_bytes_per_chunk) + n_copy = n; + else + n_copy = dev->data_bytes_per_chunk - start; + + cache = yaffs_find_chunk_cache(in, chunk); + + /* If the chunk is already in the cache or it is less than + * a whole chunk or we're using inband tags then use the cache + * (if there is caching) else bypass the cache. + */ + if (cache || n_copy != dev->data_bytes_per_chunk || + dev->param.inband_tags) { + if (dev->param.n_caches > 0) { + + /* If we can't find the data in the cache, + * then load it up. */ + + if (!cache) { + cache = + yaffs_grab_chunk_cache(in->my_dev); + cache->object = in; + cache->chunk_id = chunk; + cache->dirty = 0; + cache->locked = 0; + yaffs_rd_data_obj(in, chunk, + cache->data); + cache->n_bytes = 0; + } + + yaffs_use_cache(dev, cache, 0); + + cache->locked = 1; + + memcpy(buffer, &cache->data[start], n_copy); + + cache->locked = 0; + } else { + /* Read into the local buffer then copy.. */ + + u8 *local_buffer = + yaffs_get_temp_buffer(dev); + yaffs_rd_data_obj(in, chunk, local_buffer); + + memcpy(buffer, &local_buffer[start], n_copy); + + yaffs_release_temp_buffer(dev, local_buffer); + } + } else { + /* A full chunk. Read directly into the buffer. */ + yaffs_rd_data_obj(in, chunk, buffer); + } + n -= n_copy; + offset += n_copy; + buffer += n_copy; + n_done += n_copy; + } + return n_done; +} + +int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset, + int n_bytes, int write_through) +{ + + int chunk; + u32 start; + int n_copy; + int n = n_bytes; + int n_done = 0; + int n_writeback; + loff_t start_write = offset; + int chunk_written = 0; + u32 n_bytes_read; + loff_t chunk_start; + struct yaffs_dev *dev; + + dev = in->my_dev; + + while (n > 0 && chunk_written >= 0) { + yaffs_addr_to_chunk(dev, offset, &chunk, &start); + + if (((loff_t)chunk) * + dev->data_bytes_per_chunk + start != offset || + start >= dev->data_bytes_per_chunk) { + yaffs_trace(YAFFS_TRACE_ERROR, + "AddrToChunk of offset %lld gives chunk %d start %d", + offset, chunk, start); + } + chunk++; /* File pos to chunk in file offset */ + + /* OK now check for the curveball where the start and end are in + * the same chunk. + */ + + if ((start + n) < dev->data_bytes_per_chunk) { + n_copy = n; + + /* Now calculate how many bytes to write back.... + * If we're overwriting and not writing to then end of + * file then we need to write back as much as was there + * before. + */ + + chunk_start = (((loff_t)(chunk - 1)) * + dev->data_bytes_per_chunk); + + if (chunk_start > in->variant.file_variant.file_size) + n_bytes_read = 0; /* Past end of file */ + else + n_bytes_read = + in->variant.file_variant.file_size - + chunk_start; + + if (n_bytes_read > dev->data_bytes_per_chunk) + n_bytes_read = dev->data_bytes_per_chunk; + + n_writeback = + (n_bytes_read > + (start + n)) ? n_bytes_read : (start + n); + + if (n_writeback < 0 || + n_writeback > dev->data_bytes_per_chunk) + BUG(); + + } else { + n_copy = dev->data_bytes_per_chunk - start; + n_writeback = dev->data_bytes_per_chunk; + } + + if (n_copy != dev->data_bytes_per_chunk || + !dev->param.cache_bypass_aligned || + dev->param.inband_tags) { + /* An incomplete start or end chunk (or maybe both + * start and end chunk), or we're using inband tags, + * or we're forcing writes through the cache, + * so we want to use the cache buffers. + */ + if (dev->param.n_caches > 0) { + struct yaffs_cache *cache; + + /* If we can't find the data in the cache, then + * load the cache */ + cache = yaffs_find_chunk_cache(in, chunk); + + if (!cache && + yaffs_check_alloc_available(dev, 1)) { + cache = yaffs_grab_chunk_cache(dev); + cache->object = in; + cache->chunk_id = chunk; + cache->dirty = 0; + cache->locked = 0; + yaffs_rd_data_obj(in, chunk, + cache->data); + } else if (cache && + !cache->dirty && + !yaffs_check_alloc_available(dev, + 1)) { + /* Drop the cache if it was a read cache + * item and no space check has been made + * for it. + */ + cache = NULL; + } + + if (cache) { + yaffs_use_cache(dev, cache, 1); + cache->locked = 1; + + memcpy(&cache->data[start], buffer, + n_copy); + + cache->locked = 0; + cache->n_bytes = n_writeback; + + if (write_through) { + chunk_written = + yaffs_wr_data_obj + (cache->object, + cache->chunk_id, + cache->data, + cache->n_bytes, 1); + cache->dirty = 0; + } + } else { + chunk_written = -1; /* fail write */ + } + } else { + /* An incomplete start or end chunk (or maybe + * both start and end chunk). Read into the + * local buffer then copy over and write back. + */ + + u8 *local_buffer = yaffs_get_temp_buffer(dev); + + yaffs_rd_data_obj(in, chunk, local_buffer); + memcpy(&local_buffer[start], buffer, n_copy); + + chunk_written = + yaffs_wr_data_obj(in, chunk, + local_buffer, + n_writeback, 0); + + yaffs_release_temp_buffer(dev, local_buffer); + } + } else { + /* A full chunk. Write directly from the buffer. */ + + chunk_written = + yaffs_wr_data_obj(in, chunk, buffer, + dev->data_bytes_per_chunk, 0); + + /* Since we've overwritten the cached data, + * we better invalidate it. */ + yaffs_invalidate_chunk_cache(in, chunk); + } + + if (chunk_written >= 0) { + n -= n_copy; + offset += n_copy; + buffer += n_copy; + n_done += n_copy; + } + } + + /* Update file object */ + + if ((start_write + n_done) > in->variant.file_variant.file_size) + in->variant.file_variant.file_size = (start_write + n_done); + + in->dirty = 1; + return n_done; +} + +int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset, + int n_bytes, int write_through) +{ + yaffs2_handle_hole(in, offset); + return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through); +} + +/* ---------------------- File resizing stuff ------------------ */ + +static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size) +{ + + struct yaffs_dev *dev = in->my_dev; + loff_t old_size = in->variant.file_variant.file_size; + int i; + int chunk_id; + u32 dummy; + int last_del; + int start_del; + + if (old_size > 0) + yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy); + else + last_del = 0; + + yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1, + &start_del, &dummy); + last_del++; + start_del++; + + /* Delete backwards so that we don't end up with holes if + * power is lost part-way through the operation. + */ + for (i = last_del; i >= start_del; i--) { + /* NB this could be optimised somewhat, + * eg. could retrieve the tags and write them without + * using yaffs_chunk_del + */ + + chunk_id = yaffs_find_del_file_chunk(in, i, NULL); + + if (chunk_id < 1) + continue; + + if (chunk_id < + (dev->internal_start_block * dev->param.chunks_per_block) || + chunk_id >= + ((dev->internal_end_block + 1) * + dev->param.chunks_per_block)) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "Found daft chunk_id %d for %d", + chunk_id, i); + } else { + in->n_data_chunks--; + yaffs_chunk_del(dev, chunk_id, 1, __LINE__); + } + } +} + +void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size) +{ + int new_full; + u32 new_partial; + struct yaffs_dev *dev = obj->my_dev; + + yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial); + + yaffs_prune_chunks(obj, new_size); + + if (new_partial != 0) { + int last_chunk = 1 + new_full; + u8 *local_buffer = yaffs_get_temp_buffer(dev); + + /* Rewrite the last chunk with its new size and zero pad */ + yaffs_rd_data_obj(obj, last_chunk, local_buffer); + memset(local_buffer + new_partial, 0, + dev->data_bytes_per_chunk - new_partial); + + yaffs_wr_data_obj(obj, last_chunk, local_buffer, + new_partial, 1); + + yaffs_release_temp_buffer(dev, local_buffer); + } + + obj->variant.file_variant.file_size = new_size; + + yaffs_prune_tree(dev, &obj->variant.file_variant); +} + +int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size) +{ + struct yaffs_dev *dev = in->my_dev; + loff_t old_size = in->variant.file_variant.file_size; + + yaffs_flush_file_cache(in); + yaffs_invalidate_whole_cache(in); + + yaffs_check_gc(dev, 0); + + if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) + return YAFFS_FAIL; + + if (new_size == old_size) + return YAFFS_OK; + + if (new_size > old_size) { + yaffs2_handle_hole(in, new_size); + in->variant.file_variant.file_size = new_size; + } else { + /* new_size < old_size */ + yaffs_resize_file_down(in, new_size); + } + + /* Write a new object header to reflect the resize. + * show we've shrunk the file, if need be + * Do this only if the file is not in the deleted directories + * and is not shadowed. + */ + if (in->parent && + !in->is_shadowed && + in->parent->obj_id != YAFFS_OBJECTID_UNLINKED && + in->parent->obj_id != YAFFS_OBJECTID_DELETED) + yaffs_update_oh(in, NULL, 0, 0, 0, NULL); + + return YAFFS_OK; +} + +int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync) +{ + if (!in->dirty) + return YAFFS_OK; + + yaffs_flush_file_cache(in); + + if (data_sync) + return YAFFS_OK; + + if (update_time) + yaffs_load_current_time(in, 0, 0); + + return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ? + YAFFS_OK : YAFFS_FAIL; +} + + +/* yaffs_del_file deletes the whole file data + * and the inode associated with the file. + * It does not delete the links associated with the file. + */ +static int yaffs_unlink_file_if_needed(struct yaffs_obj *in) +{ + int ret_val; + int del_now = 0; + struct yaffs_dev *dev = in->my_dev; + + if (!in->my_inode) + del_now = 1; + + if (del_now) { + ret_val = + yaffs_change_obj_name(in, in->my_dev->del_dir, + _Y("deleted"), 0, 0); + yaffs_trace(YAFFS_TRACE_TRACING, + "yaffs: immediate deletion of file %d", + in->obj_id); + in->deleted = 1; + in->my_dev->n_deleted_files++; + if (dev->param.disable_soft_del || dev->param.is_yaffs2) + yaffs_resize_file(in, 0); + yaffs_soft_del_file(in); + } else { + ret_val = + yaffs_change_obj_name(in, in->my_dev->unlinked_dir, + _Y("unlinked"), 0, 0); + } + return ret_val; +} + +static int yaffs_del_file(struct yaffs_obj *in) +{ + int ret_val = YAFFS_OK; + int deleted; /* Need to cache value on stack if in is freed */ + struct yaffs_dev *dev = in->my_dev; + + if (dev->param.disable_soft_del || dev->param.is_yaffs2) + yaffs_resize_file(in, 0); + + if (in->n_data_chunks > 0) { + /* Use soft deletion if there is data in the file. + * That won't be the case if it has been resized to zero. + */ + if (!in->unlinked) + ret_val = yaffs_unlink_file_if_needed(in); + + deleted = in->deleted; + + if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) { + in->deleted = 1; + deleted = 1; + in->my_dev->n_deleted_files++; + yaffs_soft_del_file(in); + } + return deleted ? YAFFS_OK : YAFFS_FAIL; + } else { + /* The file has no data chunks so we toss it immediately */ + yaffs_free_tnode(in->my_dev, in->variant.file_variant.top); + in->variant.file_variant.top = NULL; + yaffs_generic_obj_del(in); + + return YAFFS_OK; + } +} + +int yaffs_is_non_empty_dir(struct yaffs_obj *obj) +{ + return (obj && + obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) && + !(list_empty(&obj->variant.dir_variant.children)); +} + +static int yaffs_del_dir(struct yaffs_obj *obj) +{ + /* First check that the directory is empty. */ + if (yaffs_is_non_empty_dir(obj)) + return YAFFS_FAIL; + + return yaffs_generic_obj_del(obj); +} + +static int yaffs_del_symlink(struct yaffs_obj *in) +{ + kfree(in->variant.symlink_variant.alias); + in->variant.symlink_variant.alias = NULL; + + return yaffs_generic_obj_del(in); +} + +static int yaffs_del_link(struct yaffs_obj *in) +{ + /* remove this hardlink from the list associated with the equivalent + * object + */ + list_del_init(&in->hard_links); + return yaffs_generic_obj_del(in); +} + +int yaffs_del_obj(struct yaffs_obj *obj) +{ + int ret_val = -1; + + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + ret_val = yaffs_del_file(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + if (!list_empty(&obj->variant.dir_variant.dirty)) { + yaffs_trace(YAFFS_TRACE_BACKGROUND, + "Remove object %d from dirty directories", + obj->obj_id); + list_del_init(&obj->variant.dir_variant.dirty); + } + return yaffs_del_dir(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + ret_val = yaffs_del_symlink(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + ret_val = yaffs_del_link(obj); + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + ret_val = yaffs_generic_obj_del(obj); + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + ret_val = 0; + break; /* should not happen. */ + } + return ret_val; +} + +static int yaffs_unlink_worker(struct yaffs_obj *obj) +{ + int del_now = 0; + + if (!obj) + return YAFFS_FAIL; + + if (!obj->my_inode) + del_now = 1; + + yaffs_update_parent(obj->parent); + + if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { + return yaffs_del_link(obj); + } else if (!list_empty(&obj->hard_links)) { + /* Curve ball: We're unlinking an object that has a hardlink. + * + * This problem arises because we are not strictly following + * The Linux link/inode model. + * + * We can't really delete the object. + * Instead, we do the following: + * - Select a hardlink. + * - Unhook it from the hard links + * - Move it from its parent directory so that the rename works. + * - Rename the object to the hardlink's name. + * - Delete the hardlink + */ + + struct yaffs_obj *hl; + struct yaffs_obj *parent; + int ret_val; + YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; + + hl = list_entry(obj->hard_links.next, struct yaffs_obj, + hard_links); + + yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1); + parent = hl->parent; + + list_del_init(&hl->hard_links); + + yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl); + + ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0); + + if (ret_val == YAFFS_OK) + ret_val = yaffs_generic_obj_del(hl); + + return ret_val; + + } else if (del_now) { + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + return yaffs_del_file(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + list_del_init(&obj->variant.dir_variant.dirty); + return yaffs_del_dir(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + return yaffs_del_symlink(obj); + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + return yaffs_generic_obj_del(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + return YAFFS_FAIL; + } + } else if (yaffs_is_non_empty_dir(obj)) { + return YAFFS_FAIL; + } else { + return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir, + _Y("unlinked"), 0, 0); + } +} + +static int yaffs_unlink_obj(struct yaffs_obj *obj) +{ + if (obj && obj->unlink_allowed) + return yaffs_unlink_worker(obj); + + return YAFFS_FAIL; +} + +int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name) +{ + struct yaffs_obj *obj; + + obj = yaffs_find_by_name(dir, name); + return yaffs_unlink_obj(obj); +} + +/* Note: + * If old_name is NULL then we take old_dir as the object to be renamed. + */ +int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name, + struct yaffs_obj *new_dir, const YCHAR *new_name) +{ + struct yaffs_obj *obj = NULL; + struct yaffs_obj *existing_target = NULL; + int force = 0; + int result; + struct yaffs_dev *dev; + + if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + BUG(); + return YAFFS_FAIL; + } + if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + BUG(); + return YAFFS_FAIL; + } + + dev = old_dir->my_dev; + +#ifdef CONFIG_YAFFS_CASE_INSENSITIVE + /* Special case for case insemsitive systems. + * While look-up is case insensitive, the name isn't. + * Therefore we might want to change x.txt to X.txt + */ + if (old_dir == new_dir && + old_name && new_name && + strcmp(old_name, new_name) == 0) + force = 1; +#endif + + if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) > + YAFFS_MAX_NAME_LENGTH) + /* ENAMETOOLONG */ + return YAFFS_FAIL; + + if (old_name) + obj = yaffs_find_by_name(old_dir, old_name); + else{ + obj = old_dir; + old_dir = obj->parent; + } + + if (obj && obj->rename_allowed) { + /* Now handle an existing target, if there is one */ + existing_target = yaffs_find_by_name(new_dir, new_name); + if (yaffs_is_non_empty_dir(existing_target)) { + return YAFFS_FAIL; /* ENOTEMPTY */ + } else if (existing_target && existing_target != obj) { + /* Nuke the target first, using shadowing, + * but only if it isn't the same object. + * + * Note we must disable gc here otherwise it can mess + * up the shadowing. + * + */ + dev->gc_disable = 1; + yaffs_change_obj_name(obj, new_dir, new_name, force, + existing_target->obj_id); + existing_target->is_shadowed = 1; + yaffs_unlink_obj(existing_target); + dev->gc_disable = 0; + } + + result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0); + + yaffs_update_parent(old_dir); + if (new_dir != old_dir) + yaffs_update_parent(new_dir); + + return result; + } + return YAFFS_FAIL; +} + +/*----------------------- Initialisation Scanning ---------------------- */ + +void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id, + int backward_scanning) +{ + struct yaffs_obj *obj; + + if (backward_scanning) { + /* Handle YAFFS2 case (backward scanning) + * If the shadowed object exists then ignore. + */ + obj = yaffs_find_by_number(dev, obj_id); + if (obj) + return; + } + + /* Let's create it (if it does not exist) assuming it is a file so that + * it can do shrinking etc. + * We put it in unlinked dir to be cleaned up after the scanning + */ + obj = + yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE); + if (!obj) + return; + obj->is_shadowed = 1; + yaffs_add_obj_to_dir(dev->unlinked_dir, obj); + obj->variant.file_variant.shrink_size = 0; + obj->valid = 1; /* So that we don't read any other info. */ +} + +void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list) +{ + struct list_head *lh; + struct list_head *save; + struct yaffs_obj *hl; + struct yaffs_obj *in; + + list_for_each_safe(lh, save, hard_list) { + hl = list_entry(lh, struct yaffs_obj, hard_links); + in = yaffs_find_by_number(dev, + hl->variant.hardlink_variant.equiv_id); + + if (in) { + /* Add the hardlink pointers */ + hl->variant.hardlink_variant.equiv_obj = in; + list_add(&hl->hard_links, &in->hard_links); + } else { + /* Todo Need to report/handle this better. + * Got a problem... hardlink to a non-existant object + */ + hl->variant.hardlink_variant.equiv_obj = NULL; + INIT_LIST_HEAD(&hl->hard_links); + } + } +} + +static void yaffs_strip_deleted_objs(struct yaffs_dev *dev) +{ + /* + * Sort out state of unlinked and deleted objects after scanning. + */ + struct list_head *i; + struct list_head *n; + struct yaffs_obj *l; + + if (dev->read_only) + return; + + /* Soft delete all the unlinked files */ + list_for_each_safe(i, n, + &dev->unlinked_dir->variant.dir_variant.children) { + l = list_entry(i, struct yaffs_obj, siblings); + yaffs_del_obj(l); + } + + list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) { + l = list_entry(i, struct yaffs_obj, siblings); + yaffs_del_obj(l); + } +} + +/* + * This code iterates through all the objects making sure that they are rooted. + * Any unrooted objects are re-rooted in lost+found. + * An object needs to be in one of: + * - Directly under deleted, unlinked + * - Directly or indirectly under root. + * + * Note: + * This code assumes that we don't ever change the current relationships + * between directories: + * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL + * lost-n-found->parent == root_dir + * + * This fixes the problem where directories might have inadvertently been + * deleted leaving the object "hanging" without being rooted in the + * directory tree. + */ + +static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj) +{ + return (obj == dev->del_dir || + obj == dev->unlinked_dir || obj == dev->root_dir); +} + +static void yaffs_fix_hanging_objs(struct yaffs_dev *dev) +{ + struct yaffs_obj *obj; + struct yaffs_obj *parent; + int i; + struct list_head *lh; + struct list_head *n; + int depth_limit; + int hanging; + + if (dev->read_only) + return; + + /* Iterate through the objects in each hash entry, + * looking at each object. + * Make sure it is rooted. + */ + + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + list_for_each_safe(lh, n, &dev->obj_bucket[i].list) { + obj = list_entry(lh, struct yaffs_obj, hash_link); + parent = obj->parent; + + if (yaffs_has_null_parent(dev, obj)) { + /* These directories are not hanging */ + hanging = 0; + } else if (!parent || + parent->variant_type != + YAFFS_OBJECT_TYPE_DIRECTORY) { + hanging = 1; + } else if (yaffs_has_null_parent(dev, parent)) { + hanging = 0; + } else { + /* + * Need to follow the parent chain to + * see if it is hanging. + */ + hanging = 0; + depth_limit = 100; + + while (parent != dev->root_dir && + parent->parent && + parent->parent->variant_type == + YAFFS_OBJECT_TYPE_DIRECTORY && + depth_limit > 0) { + parent = parent->parent; + depth_limit--; + } + if (parent != dev->root_dir) + hanging = 1; + } + if (hanging) { + yaffs_trace(YAFFS_TRACE_SCAN, + "Hanging object %d moved to lost and found", + obj->obj_id); + yaffs_add_obj_to_dir(dev->lost_n_found, obj); + } + } + } +} + +/* + * Delete directory contents for cleaning up lost and found. + */ +static void yaffs_del_dir_contents(struct yaffs_obj *dir) +{ + struct yaffs_obj *obj; + struct list_head *lh; + struct list_head *n; + + if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + BUG(); + + list_for_each_safe(lh, n, &dir->variant.dir_variant.children) { + obj = list_entry(lh, struct yaffs_obj, siblings); + if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) + yaffs_del_dir_contents(obj); + yaffs_trace(YAFFS_TRACE_SCAN, + "Deleting lost_found object %d", + obj->obj_id); + yaffs_unlink_obj(obj); + } +} + +static void yaffs_empty_l_n_f(struct yaffs_dev *dev) +{ + yaffs_del_dir_contents(dev->lost_n_found); +} + + +struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory, + const YCHAR *name) +{ + int sum; + struct list_head *i; + YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1]; + struct yaffs_obj *l; + + if (!name) + return NULL; + + if (!directory) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "tragedy: yaffs_find_by_name: null pointer directory" + ); + BUG(); + return NULL; + } + if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "tragedy: yaffs_find_by_name: non-directory" + ); + BUG(); + } + + sum = yaffs_calc_name_sum(name); + + list_for_each(i, &directory->variant.dir_variant.children) { + l = list_entry(i, struct yaffs_obj, siblings); + + if (l->parent != directory) + BUG(); + + yaffs_check_obj_details_loaded(l); + + /* Special case for lost-n-found */ + if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { + if (!strcmp(name, YAFFS_LOSTNFOUND_NAME)) + return l; + } else if (l->sum == sum || l->hdr_chunk <= 0) { + /* LostnFound chunk called Objxxx + * Do a real check + */ + yaffs_get_obj_name(l, buffer, + YAFFS_MAX_NAME_LENGTH + 1); + if (!strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH)) + return l; + } + } + return NULL; +} + +/* GetEquivalentObject dereferences any hard links to get to the + * actual object. + */ + +struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj) +{ + if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { + obj = obj->variant.hardlink_variant.equiv_obj; + yaffs_check_obj_details_loaded(obj); + } + return obj; +} + +/* + * A note or two on object names. + * * If the object name is missing, we then make one up in the form objnnn + * + * * ASCII names are stored in the object header's name field from byte zero + * * Unicode names are historically stored starting from byte zero. + * + * Then there are automatic Unicode names... + * The purpose of these is to save names in a way that can be read as + * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII + * system to share files. + * + * These automatic unicode are stored slightly differently... + * - If the name can fit in the ASCII character space then they are saved as + * ascii names as per above. + * - If the name needs Unicode then the name is saved in Unicode + * starting at oh->name[1]. + + */ +static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name, + int buffer_size) +{ + /* Create an object name if we could not find one. */ + if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) { + YCHAR local_name[20]; + YCHAR num_string[20]; + YCHAR *x = &num_string[19]; + unsigned v = obj->obj_id; + num_string[19] = 0; + while (v > 0) { + x--; + *x = '0' + (v % 10); + v /= 10; + } + /* make up a name */ + strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX); + strcat(local_name, x); + strncpy(name, local_name, buffer_size - 1); + } +} + +int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size) +{ + memset(name, 0, buffer_size * sizeof(YCHAR)); + yaffs_check_obj_details_loaded(obj); + if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { + strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1); + } else if (obj->short_name[0]) { + strcpy(name, obj->short_name); + } else if (obj->hdr_chunk > 0) { + int result; + u8 *buffer = yaffs_get_temp_buffer(obj->my_dev); + + struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer; + + memset(buffer, 0, obj->my_dev->data_bytes_per_chunk); + + if (obj->hdr_chunk > 0) { + result = yaffs_rd_chunk_tags_nand(obj->my_dev, + obj->hdr_chunk, + buffer, NULL); + } + yaffs_load_name_from_oh(obj->my_dev, name, oh->name, + buffer_size); + + yaffs_release_temp_buffer(obj->my_dev, buffer); + } + + yaffs_fix_null_name(obj, name, buffer_size); + + return strnlen(name, YAFFS_MAX_NAME_LENGTH); +} + +loff_t yaffs_get_obj_length(struct yaffs_obj *obj) +{ + /* Dereference any hard linking */ + obj = yaffs_get_equivalent_obj(obj); + + if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) + return obj->variant.file_variant.file_size; + if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { + if (!obj->variant.symlink_variant.alias) + return 0; + return strnlen(obj->variant.symlink_variant.alias, + YAFFS_MAX_ALIAS_LENGTH); + } else { + /* Only a directory should drop through to here */ + return obj->my_dev->data_bytes_per_chunk; + } +} + +int yaffs_get_obj_link_count(struct yaffs_obj *obj) +{ + int count = 0; + struct list_head *i; + + if (!obj->unlinked) + count++; /* the object itself */ + + list_for_each(i, &obj->hard_links) + count++; /* add the hard links; */ + + return count; +} + +int yaffs_get_obj_inode(struct yaffs_obj *obj) +{ + obj = yaffs_get_equivalent_obj(obj); + + return obj->obj_id; +} + +unsigned yaffs_get_obj_type(struct yaffs_obj *obj) +{ + obj = yaffs_get_equivalent_obj(obj); + + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + return DT_REG; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + return DT_DIR; + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + return DT_LNK; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + return DT_REG; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + if (S_ISFIFO(obj->yst_mode)) + return DT_FIFO; + if (S_ISCHR(obj->yst_mode)) + return DT_CHR; + if (S_ISBLK(obj->yst_mode)) + return DT_BLK; + if (S_ISSOCK(obj->yst_mode)) + return DT_SOCK; + return DT_REG; + break; + default: + return DT_REG; + break; + } +} + +YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj) +{ + obj = yaffs_get_equivalent_obj(obj); + if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) + return yaffs_clone_str(obj->variant.symlink_variant.alias); + else + return yaffs_clone_str(_Y("")); +} + +/*--------------------------- Initialisation code -------------------------- */ + +static int yaffs_check_dev_fns(struct yaffs_dev *dev) +{ + struct yaffs_driver *drv = &dev->drv; + struct yaffs_tags_handler *tagger = &dev->tagger; + + /* Common functions, gotta have */ + if (!drv->drv_read_chunk_fn || + !drv->drv_write_chunk_fn || + !drv->drv_erase_fn) + return 0; + + if (dev->param.is_yaffs2 && + (!drv->drv_mark_bad_fn || !drv->drv_check_bad_fn)) + return 0; + + /* Install the default tags marshalling functions if needed. */ + yaffs_tags_compat_install(dev); + yaffs_tags_marshall_install(dev); + + /* Check we now have the marshalling functions required. */ + if (!tagger->write_chunk_tags_fn || + !tagger->read_chunk_tags_fn || + !tagger->query_block_fn || + !tagger->mark_bad_fn) + return 0; + + return 1; +} + +static int yaffs_create_initial_dir(struct yaffs_dev *dev) +{ + /* Initialise the unlinked, deleted, root and lost+found directories */ + dev->lost_n_found = dev->root_dir = NULL; + dev->unlinked_dir = dev->del_dir = NULL; + dev->unlinked_dir = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR); + dev->del_dir = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR); + dev->root_dir = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT, + YAFFS_ROOT_MODE | S_IFDIR); + dev->lost_n_found = + yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND, + YAFFS_LOSTNFOUND_MODE | S_IFDIR); + + if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir + && dev->del_dir) { + yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found); + return YAFFS_OK; + } + return YAFFS_FAIL; +} + +/* Low level init. + * Typically only used by yaffs_guts_initialise, but also used by the + * Low level yaffs driver tests. + */ + +int yaffs_guts_ll_init(struct yaffs_dev *dev) +{ + + + yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_ll_init()"); + + if (!dev) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs: Need a device" + ); + return YAFFS_FAIL; + } + + if (dev->ll_init) + return YAFFS_OK; + + dev->internal_start_block = dev->param.start_block; + dev->internal_end_block = dev->param.end_block; + dev->block_offset = 0; + dev->chunk_offset = 0; + dev->n_free_chunks = 0; + + dev->gc_block = 0; + + if (dev->param.start_block == 0) { + dev->internal_start_block = dev->param.start_block + 1; + dev->internal_end_block = dev->param.end_block + 1; + dev->block_offset = 1; + dev->chunk_offset = dev->param.chunks_per_block; + } + + /* Check geometry parameters. */ + + if ((!dev->param.inband_tags && dev->param.is_yaffs2 && + dev->param.total_bytes_per_chunk < 1024) || + (!dev->param.is_yaffs2 && + dev->param.total_bytes_per_chunk < 512) || + (dev->param.inband_tags && !dev->param.is_yaffs2) || + dev->param.chunks_per_block < 2 || + dev->param.n_reserved_blocks < 2 || + dev->internal_start_block <= 0 || + dev->internal_end_block <= 0 || + dev->internal_end_block <= + (dev->internal_start_block + dev->param.n_reserved_blocks + 2) + ) { + /* otherwise it is too small */ + yaffs_trace(YAFFS_TRACE_ALWAYS, + "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ", + dev->param.total_bytes_per_chunk, + dev->param.is_yaffs2 ? "2" : "", + dev->param.inband_tags); + return YAFFS_FAIL; + } + + /* Sort out space for inband tags, if required */ + if (dev->param.inband_tags) + dev->data_bytes_per_chunk = + dev->param.total_bytes_per_chunk - + sizeof(struct yaffs_packed_tags2_tags_only); + else + dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk; + + /* Got the right mix of functions? */ + if (!yaffs_check_dev_fns(dev)) { + /* Function missing */ + yaffs_trace(YAFFS_TRACE_ALWAYS, + "device function(s) missing or wrong"); + + return YAFFS_FAIL; + } + + if (yaffs_init_nand(dev) != YAFFS_OK) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed"); + return YAFFS_FAIL; + } + + return YAFFS_OK; +} + + +int yaffs_format_dev(struct yaffs_dev *dev) +{ + int i; + enum yaffs_block_state state; + u32 dummy; + + if(yaffs_guts_ll_init(dev) != YAFFS_OK) + return YAFFS_FAIL; + + if(dev->is_mounted) + return YAFFS_FAIL; + + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + yaffs_query_init_block_state(dev, i, &state, &dummy); + if (state != YAFFS_BLOCK_STATE_DEAD) + yaffs_erase_block(dev, i); + } + + return YAFFS_OK; +} + + +int yaffs_guts_initialise(struct yaffs_dev *dev) +{ + int init_failed = 0; + unsigned x; + int bits; + + if(yaffs_guts_ll_init(dev) != YAFFS_OK) + return YAFFS_FAIL; + + if (dev->is_mounted) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted"); + return YAFFS_FAIL; + } + + dev->is_mounted = 1; + + /* OK now calculate a few things for the device */ + + /* + * Calculate all the chunk size manipulation numbers: + */ + x = dev->data_bytes_per_chunk; + /* We always use dev->chunk_shift and dev->chunk_div */ + dev->chunk_shift = calc_shifts(x); + x >>= dev->chunk_shift; + dev->chunk_div = x; + /* We only use chunk mask if chunk_div is 1 */ + dev->chunk_mask = (1 << dev->chunk_shift) - 1; + + /* + * Calculate chunk_grp_bits. + * We need to find the next power of 2 > than internal_end_block + */ + + x = dev->param.chunks_per_block * (dev->internal_end_block + 1); + + bits = calc_shifts_ceiling(x); + + /* Set up tnode width if wide tnodes are enabled. */ + if (!dev->param.wide_tnodes_disabled) { + /* bits must be even so that we end up with 32-bit words */ + if (bits & 1) + bits++; + if (bits < 16) + dev->tnode_width = 16; + else + dev->tnode_width = bits; + } else { + dev->tnode_width = 16; + } + + dev->tnode_mask = (1 << dev->tnode_width) - 1; + + /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled), + * so if the bitwidth of the + * chunk range we're using is greater than 16 we need + * to figure out chunk shift and chunk_grp_size + */ + + if (bits <= dev->tnode_width) + dev->chunk_grp_bits = 0; + else + dev->chunk_grp_bits = bits - dev->tnode_width; + + dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8; + if (dev->tnode_size < sizeof(struct yaffs_tnode)) + dev->tnode_size = sizeof(struct yaffs_tnode); + + dev->chunk_grp_size = 1 << dev->chunk_grp_bits; + + if (dev->param.chunks_per_block < dev->chunk_grp_size) { + /* We have a problem because the soft delete won't work if + * the chunk group size > chunks per block. + * This can be remedied by using larger "virtual blocks". + */ + yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large"); + + return YAFFS_FAIL; + } + + /* Finished verifying the device, continue with initialisation */ + + /* More device initialisation */ + dev->all_gcs = 0; + dev->passive_gc_count = 0; + dev->oldest_dirty_gc_count = 0; + dev->bg_gcs = 0; + dev->gc_block_finder = 0; + dev->buffered_block = -1; + dev->doing_buffered_block_rewrite = 0; + dev->n_deleted_files = 0; + dev->n_bg_deletions = 0; + dev->n_unlinked_files = 0; + dev->n_ecc_fixed = 0; + dev->n_ecc_unfixed = 0; + dev->n_tags_ecc_fixed = 0; + dev->n_tags_ecc_unfixed = 0; + dev->n_erase_failures = 0; + dev->n_erased_blocks = 0; + dev->gc_disable = 0; + dev->has_pending_prioritised_gc = 1; + /* Assume the worst for now, will get fixed on first GC */ + INIT_LIST_HEAD(&dev->dirty_dirs); + dev->oldest_dirty_seq = 0; + dev->oldest_dirty_block = 0; + + /* Initialise temporary buffers and caches. */ + if (!yaffs_init_tmp_buffers(dev)) + init_failed = 1; + + dev->cache = NULL; + dev->gc_cleanup_list = NULL; + + if (!init_failed && dev->param.n_caches > 0) { + int i; + void *buf; + int cache_bytes = + dev->param.n_caches * sizeof(struct yaffs_cache); + + if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES) + dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES; + + dev->cache = kmalloc(cache_bytes, GFP_NOFS); + + buf = (u8 *) dev->cache; + + if (dev->cache) + memset(dev->cache, 0, cache_bytes); + + for (i = 0; i < dev->param.n_caches && buf; i++) { + dev->cache[i].object = NULL; + dev->cache[i].last_use = 0; + dev->cache[i].dirty = 0; + dev->cache[i].data = buf = + kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); + } + if (!buf) + init_failed = 1; + + dev->cache_last_use = 0; + } + + dev->cache_hits = 0; + + if (!init_failed) { + dev->gc_cleanup_list = + kmalloc(dev->param.chunks_per_block * sizeof(u32), + GFP_NOFS); + if (!dev->gc_cleanup_list) + init_failed = 1; + } + + if (dev->param.is_yaffs2) + dev->param.use_header_file_size = 1; + + if (!init_failed && !yaffs_init_blocks(dev)) + init_failed = 1; + + yaffs_init_tnodes_and_objs(dev); + + if (!init_failed && !yaffs_create_initial_dir(dev)) + init_failed = 1; + + if (!init_failed && dev->param.is_yaffs2 && + !dev->param.disable_summary && + !yaffs_summary_init(dev)) + init_failed = 1; + + if (!init_failed) { + /* Now scan the flash. */ + if (dev->param.is_yaffs2) { + if (yaffs2_checkpt_restore(dev)) { + yaffs_check_obj_details_loaded(dev->root_dir); + yaffs_trace(YAFFS_TRACE_CHECKPOINT | + YAFFS_TRACE_MOUNT, + "yaffs: restored from checkpoint" + ); + } else { + + /* Clean up the mess caused by an aborted + * checkpoint load then scan backwards. + */ + yaffs_deinit_blocks(dev); + + yaffs_deinit_tnodes_and_objs(dev); + + dev->n_erased_blocks = 0; + dev->n_free_chunks = 0; + dev->alloc_block = -1; + dev->alloc_page = -1; + dev->n_deleted_files = 0; + dev->n_unlinked_files = 0; + dev->n_bg_deletions = 0; + + if (!init_failed && !yaffs_init_blocks(dev)) + init_failed = 1; + + yaffs_init_tnodes_and_objs(dev); + + if (!init_failed + && !yaffs_create_initial_dir(dev)) + init_failed = 1; + + if (!init_failed && !yaffs2_scan_backwards(dev)) + init_failed = 1; + } + } else if (!yaffs1_scan(dev)) { + init_failed = 1; + } + + yaffs_strip_deleted_objs(dev); + yaffs_fix_hanging_objs(dev); + if (dev->param.empty_lost_n_found) + yaffs_empty_l_n_f(dev); + } + + if (init_failed) { + /* Clean up the mess */ + yaffs_trace(YAFFS_TRACE_TRACING, + "yaffs: yaffs_guts_initialise() aborted."); + + yaffs_deinitialise(dev); + return YAFFS_FAIL; + } + + /* Zero out stats */ + dev->n_page_reads = 0; + dev->n_page_writes = 0; + dev->n_erasures = 0; + dev->n_gc_copies = 0; + dev->n_retried_writes = 0; + + dev->n_retired_blocks = 0; + + yaffs_verify_free_chunks(dev); + yaffs_verify_blocks(dev); + + /* Clean up any aborted checkpoint data */ + if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0) + yaffs2_checkpt_invalidate(dev); + + yaffs_trace(YAFFS_TRACE_TRACING, + "yaffs: yaffs_guts_initialise() done."); + return YAFFS_OK; +} + +void yaffs_deinitialise(struct yaffs_dev *dev) +{ + if (dev->is_mounted) { + int i; + + yaffs_deinit_blocks(dev); + yaffs_deinit_tnodes_and_objs(dev); + yaffs_summary_deinit(dev); + + if (dev->param.n_caches > 0 && dev->cache) { + + for (i = 0; i < dev->param.n_caches; i++) { + kfree(dev->cache[i].data); + dev->cache[i].data = NULL; + } + + kfree(dev->cache); + dev->cache = NULL; + } + + kfree(dev->gc_cleanup_list); + + for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) + kfree(dev->temp_buffer[i].buffer); + + dev->is_mounted = 0; + + yaffs_deinit_nand(dev); + } +} + +int yaffs_count_free_chunks(struct yaffs_dev *dev) +{ + int n_free = 0; + int b; + struct yaffs_block_info *blk; + + blk = dev->block_info; + for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) { + switch (blk->block_state) { + case YAFFS_BLOCK_STATE_EMPTY: + case YAFFS_BLOCK_STATE_ALLOCATING: + case YAFFS_BLOCK_STATE_COLLECTING: + case YAFFS_BLOCK_STATE_FULL: + n_free += + (dev->param.chunks_per_block - blk->pages_in_use + + blk->soft_del_pages); + break; + default: + break; + } + blk++; + } + return n_free; +} + +int yaffs_get_n_free_chunks(struct yaffs_dev *dev) +{ + /* This is what we report to the outside world */ + int n_free; + int n_dirty_caches; + int blocks_for_checkpt; + int i; + + n_free = dev->n_free_chunks; + n_free += dev->n_deleted_files; + + /* Now count and subtract the number of dirty chunks in the cache. */ + + for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].dirty) + n_dirty_caches++; + } + + n_free -= n_dirty_caches; + + n_free -= + ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block); + + /* Now figure checkpoint space and report that... */ + blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev); + + n_free -= (blocks_for_checkpt * dev->param.chunks_per_block); + + if (n_free < 0) + n_free = 0; + + return n_free; +} + + + +/* + * Marshalling functions to get loff_t file sizes into and out of + * object headers. + */ +void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize) +{ + oh->file_size_low = (fsize & 0xFFFFFFFF); + oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF); +} + +loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh) +{ + loff_t retval; + + if (sizeof(loff_t) >= 8 && ~(oh->file_size_high)) + retval = (((loff_t) oh->file_size_high) << 32) | + (((loff_t) oh->file_size_low) & 0xFFFFFFFF); + else + retval = (loff_t) oh->file_size_low; + + return retval; +} + + +void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]) +{ + int i; + struct yaffs_block_info *bi; + int s; + + for(i = 0; i < 10; i++) + bs[i] = 0; + + for(i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + bi = yaffs_get_block_info(dev, i); + s = bi->block_state; + if(s > YAFFS_BLOCK_STATE_DEAD || s < YAFFS_BLOCK_STATE_UNKNOWN) + bs[0]++; + else + bs[s]++; + } +} diff --git a/fs/yaffs2/yaffs_guts.h b/fs/yaffs2/yaffs_guts.h new file mode 100644 index 000000000000..05785367cb2e --- /dev/null +++ b/fs/yaffs2/yaffs_guts.h @@ -0,0 +1,1003 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_GUTS_H__ +#define __YAFFS_GUTS_H__ + +#include "yportenv.h" + +#define YAFFS_OK 1 +#define YAFFS_FAIL 0 + +/* Give us a Y=0x59, + * Give us an A=0x41, + * Give us an FF=0xff + * Give us an S=0x53 + * And what have we got... + */ +#define YAFFS_MAGIC 0x5941ff53 + +/* + * Tnodes form a tree with the tnodes in "levels" + * Levels greater than 0 hold 8 slots which point to other tnodes. + * Those at level 0 hold 16 slots which point to chunks in NAND. + * + * A maximum level of 8 thust supports files of size up to: + * + * 2^(3*MAX_LEVEL+4) + * + * Thus a max level of 8 supports files with up to 2^^28 chunks which gives + * a maximum file size of around 512Gbytees with 2k chunks. + */ +#define YAFFS_NTNODES_LEVEL0 16 +#define YAFFS_TNODES_LEVEL0_BITS 4 +#define YAFFS_TNODES_LEVEL0_MASK 0xf + +#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2) +#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1) +#define YAFFS_TNODES_INTERNAL_MASK 0x7 +#define YAFFS_TNODES_MAX_LEVEL 8 +#define YAFFS_TNODES_MAX_BITS (YAFFS_TNODES_LEVEL0_BITS + \ + YAFFS_TNODES_INTERNAL_BITS * \ + YAFFS_TNODES_MAX_LEVEL) +#define YAFFS_MAX_CHUNK_ID ((1 << YAFFS_TNODES_MAX_BITS) - 1) + +#define YAFFS_MAX_FILE_SIZE_32 0x7fffffff + +/* Constants for YAFFS1 mode */ +#define YAFFS_BYTES_PER_SPARE 16 +#define YAFFS_BYTES_PER_CHUNK 512 +#define YAFFS_CHUNK_SIZE_SHIFT 9 +#define YAFFS_CHUNKS_PER_BLOCK 32 +#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) + +#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024 +#define YAFFS_MIN_YAFFS2_SPARE_SIZE 32 + + + +#define YAFFS_ALLOCATION_NOBJECTS 100 +#define YAFFS_ALLOCATION_NTNODES 100 +#define YAFFS_ALLOCATION_NLINKS 100 + +#define YAFFS_NOBJECT_BUCKETS 256 + +#define YAFFS_OBJECT_SPACE 0x40000 +#define YAFFS_MAX_OBJECT_ID (YAFFS_OBJECT_SPACE - 1) + +/* Binary data version stamps */ +#define YAFFS_SUMMARY_VERSION 1 +#define YAFFS_CHECKPOINT_VERSION 7 + +#ifdef CONFIG_YAFFS_UNICODE +#define YAFFS_MAX_NAME_LENGTH 127 +#define YAFFS_MAX_ALIAS_LENGTH 79 +#else +#define YAFFS_MAX_NAME_LENGTH 255 +#define YAFFS_MAX_ALIAS_LENGTH 159 +#endif + +#define YAFFS_SHORT_NAME_LENGTH 15 + +/* Some special object ids for pseudo objects */ +#define YAFFS_OBJECTID_ROOT 1 +#define YAFFS_OBJECTID_LOSTNFOUND 2 +#define YAFFS_OBJECTID_UNLINKED 3 +#define YAFFS_OBJECTID_DELETED 4 + +/* Fake object Id for summary data */ +#define YAFFS_OBJECTID_SUMMARY 0x10 + +/* Pseudo object ids for checkpointing */ +#define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20 +#define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21 + +#define YAFFS_MAX_SHORT_OP_CACHES 20 + +#define YAFFS_N_TEMP_BUFFERS 6 + +/* We limit the number attempts at sucessfully saving a chunk of data. + * Small-page devices have 32 pages per block; large-page devices have 64. + * Default to something in the order of 5 to 10 blocks worth of chunks. + */ +#define YAFFS_WR_ATTEMPTS (5*64) + +/* Sequence numbers are used in YAFFS2 to determine block allocation order. + * The range is limited slightly to help distinguish bad numbers from good. + * This also allows us to perhaps in the future use special numbers for + * special purposes. + * EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years, + * and is a larger number than the lifetime of a 2GB device. + */ +#define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000 +#define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xefffff00 + +/* Special sequence number for bad block that failed to be marked bad */ +#define YAFFS_SEQUENCE_BAD_BLOCK 0xffff0000 + +/* ChunkCache is used for short read/write operations.*/ +struct yaffs_cache { + struct yaffs_obj *object; + int chunk_id; + int last_use; + int dirty; + int n_bytes; /* Only valid if the cache is dirty */ + int locked; /* Can't push out or flush while locked. */ + u8 *data; +}; + +/* yaffs1 tags structures in RAM + * NB This uses bitfield. Bitfields should not straddle a u32 boundary + * otherwise the structure size will get blown out. + */ + +struct yaffs_tags { + unsigned chunk_id:20; + unsigned serial_number:2; + unsigned n_bytes_lsb:10; + unsigned obj_id:18; + unsigned ecc:12; + unsigned n_bytes_msb:2; +}; + +union yaffs_tags_union { + struct yaffs_tags as_tags; + u8 as_bytes[8]; +}; + + +/* Stuff used for extended tags in YAFFS2 */ + +enum yaffs_ecc_result { + YAFFS_ECC_RESULT_UNKNOWN, + YAFFS_ECC_RESULT_NO_ERROR, + YAFFS_ECC_RESULT_FIXED, + YAFFS_ECC_RESULT_UNFIXED +}; + +enum yaffs_obj_type { + YAFFS_OBJECT_TYPE_UNKNOWN, + YAFFS_OBJECT_TYPE_FILE, + YAFFS_OBJECT_TYPE_SYMLINK, + YAFFS_OBJECT_TYPE_DIRECTORY, + YAFFS_OBJECT_TYPE_HARDLINK, + YAFFS_OBJECT_TYPE_SPECIAL +}; + +#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL + +struct yaffs_ext_tags { + unsigned chunk_used; /* Status of the chunk: used or unused */ + unsigned obj_id; /* If 0 this is not used */ + unsigned chunk_id; /* If 0 this is a header, else a data chunk */ + unsigned n_bytes; /* Only valid for data chunks */ + + /* The following stuff only has meaning when we read */ + enum yaffs_ecc_result ecc_result; + unsigned block_bad; + + /* YAFFS 1 stuff */ + unsigned is_deleted; /* The chunk is marked deleted */ + unsigned serial_number; /* Yaffs1 2-bit serial number */ + + /* YAFFS2 stuff */ + unsigned seq_number; /* The sequence number of this block */ + + /* Extra info if this is an object header (YAFFS2 only) */ + + unsigned extra_available; /* Extra info available if not zero */ + unsigned extra_parent_id; /* The parent object */ + unsigned extra_is_shrink; /* Is it a shrink header? */ + unsigned extra_shadows; /* Does this shadow another object? */ + + enum yaffs_obj_type extra_obj_type; /* What object type? */ + + loff_t extra_file_size; /* Length if it is a file */ + unsigned extra_equiv_id; /* Equivalent object for a hard link */ +}; + +/* Spare structure for YAFFS1 */ +struct yaffs_spare { + u8 tb0; + u8 tb1; + u8 tb2; + u8 tb3; + u8 page_status; /* set to 0 to delete the chunk */ + u8 block_status; + u8 tb4; + u8 tb5; + u8 ecc1[3]; + u8 tb6; + u8 tb7; + u8 ecc2[3]; +}; + +/*Special structure for passing through to mtd */ +struct yaffs_nand_spare { + struct yaffs_spare spare; + int eccres1; + int eccres2; +}; + +/* Block data in RAM */ + +enum yaffs_block_state { + YAFFS_BLOCK_STATE_UNKNOWN = 0, + + YAFFS_BLOCK_STATE_SCANNING, + /* Being scanned */ + + YAFFS_BLOCK_STATE_NEEDS_SCAN, + /* The block might have something on it (ie it is allocating or full, + * perhaps empty) but it needs to be scanned to determine its true + * state. + * This state is only valid during scanning. + * NB We tolerate empty because the pre-scanner might be incapable of + * deciding + * However, if this state is returned on a YAFFS2 device, + * then we expect a sequence number + */ + + YAFFS_BLOCK_STATE_EMPTY, + /* This block is empty */ + + YAFFS_BLOCK_STATE_ALLOCATING, + /* This block is partially allocated. + * At least one page holds valid data. + * This is the one currently being used for page + * allocation. Should never be more than one of these. + * If a block is only partially allocated at mount it is treated as + * full. + */ + + YAFFS_BLOCK_STATE_FULL, + /* All the pages in this block have been allocated. + * If a block was only partially allocated when mounted we treat + * it as fully allocated. + */ + + YAFFS_BLOCK_STATE_DIRTY, + /* The block was full and now all chunks have been deleted. + * Erase me, reuse me. + */ + + YAFFS_BLOCK_STATE_CHECKPOINT, + /* This block is assigned to holding checkpoint data. */ + + YAFFS_BLOCK_STATE_COLLECTING, + /* This block is being garbage collected */ + + YAFFS_BLOCK_STATE_DEAD + /* This block has failed and is not in use */ +}; + +#define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1) + +struct yaffs_block_info { + + int soft_del_pages:10; /* number of soft deleted pages */ + int pages_in_use:10; /* number of pages in use */ + unsigned block_state:4; /* One of the above block states. */ + /* NB use unsigned because enum is sometimes + * an int */ + u32 needs_retiring:1; /* Data has failed on this block, */ + /*need to get valid data off and retire*/ + u32 skip_erased_check:1;/* Skip the erased check on this block */ + u32 gc_prioritise:1; /* An ECC check or blank check has failed. + Block should be prioritised for GC */ + u32 chunk_error_strikes:3; /* How many times we've had ecc etc + failures on this block and tried to reuse it */ + u32 has_summary:1; /* The block has a summary */ + + u32 has_shrink_hdr:1; /* This block has at least one shrink header */ + u32 seq_number; /* block sequence number for yaffs2 */ + +}; + +/* -------------------------- Object structure -------------------------------*/ +/* This is the object structure as stored on NAND */ + +struct yaffs_obj_hdr { + enum yaffs_obj_type type; + + /* Apply to everything */ + int parent_obj_id; + u16 sum_no_longer_used; /* checksum of name. No longer used */ + YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; + + /* The following apply to all object types except for hard links */ + u32 yst_mode; /* protection */ + + u32 yst_uid; + u32 yst_gid; + u32 yst_atime; + u32 yst_mtime; + u32 yst_ctime; + + /* File size applies to files only */ + u32 file_size_low; + + /* Equivalent object id applies to hard links only. */ + int equiv_id; + + /* Alias is for symlinks only. */ + YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1]; + + u32 yst_rdev; /* stuff for block and char devices (major/min) */ + + u32 win_ctime[2]; + u32 win_atime[2]; + u32 win_mtime[2]; + + u32 inband_shadowed_obj_id; + u32 inband_is_shrink; + + u32 file_size_high; + u32 reserved[1]; + int shadows_obj; /* This object header shadows the + specified object if > 0 */ + + /* is_shrink applies to object headers written when wemake a hole. */ + u32 is_shrink; + +}; + +/*--------------------------- Tnode -------------------------- */ + +struct yaffs_tnode { + struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL]; +}; + +/*------------------------ Object -----------------------------*/ +/* An object can be one of: + * - a directory (no data, has children links + * - a regular file (data.... not prunes :->). + * - a symlink [symbolic link] (the alias). + * - a hard link + */ + +struct yaffs_file_var { + loff_t file_size; + loff_t scanned_size; + loff_t shrink_size; + int top_level; + struct yaffs_tnode *top; +}; + +struct yaffs_dir_var { + struct list_head children; /* list of child links */ + struct list_head dirty; /* Entry for list of dirty directories */ +}; + +struct yaffs_symlink_var { + YCHAR *alias; +}; + +struct yaffs_hardlink_var { + struct yaffs_obj *equiv_obj; + u32 equiv_id; +}; + +union yaffs_obj_var { + struct yaffs_file_var file_variant; + struct yaffs_dir_var dir_variant; + struct yaffs_symlink_var symlink_variant; + struct yaffs_hardlink_var hardlink_variant; +}; + +struct yaffs_obj { + u8 deleted:1; /* This should only apply to unlinked files. */ + u8 soft_del:1; /* it has also been soft deleted */ + u8 unlinked:1; /* An unlinked file.*/ + u8 fake:1; /* A fake object has no presence on NAND. */ + u8 rename_allowed:1; /* Some objects cannot be renamed. */ + u8 unlink_allowed:1; + u8 dirty:1; /* the object needs to be written to flash */ + u8 valid:1; /* When the file system is being loaded up, this + * object might be created before the data + * is available + * ie. file data chunks encountered before + * the header. + */ + u8 lazy_loaded:1; /* This object has been lazy loaded and + * is missing some detail */ + + u8 defered_free:1; /* Object is removed from NAND, but is + * still in the inode cache. + * Free of object is defered. + * until the inode is released. + */ + u8 being_created:1; /* This object is still being created + * so skip some verification checks. */ + u8 is_shadowed:1; /* This object is shadowed on the way + * to being renamed. */ + + u8 xattr_known:1; /* We know if this has object has xattribs + * or not. */ + u8 has_xattr:1; /* This object has xattribs. + * Only valid if xattr_known. */ + + u8 serial; /* serial number of chunk in NAND.*/ + u16 sum; /* sum of the name to speed searching */ + + struct yaffs_dev *my_dev; /* The device I'm on */ + + struct list_head hash_link; /* list of objects in hash bucket */ + + struct list_head hard_links; /* hard linked object chain*/ + + /* directory structure stuff */ + /* also used for linking up the free list */ + struct yaffs_obj *parent; + struct list_head siblings; + + /* Where's my object header in NAND? */ + int hdr_chunk; + + int n_data_chunks; /* Number of data chunks for this file. */ + + u32 obj_id; /* the object id value */ + + u32 yst_mode; + + YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1]; + +#ifdef CONFIG_YAFFS_WINCE + u32 win_ctime[2]; + u32 win_mtime[2]; + u32 win_atime[2]; +#else + u32 yst_uid; + u32 yst_gid; + u32 yst_atime; + u32 yst_mtime; + u32 yst_ctime; +#endif + + u32 yst_rdev; + + void *my_inode; + + enum yaffs_obj_type variant_type; + + union yaffs_obj_var variant; + +}; + +struct yaffs_obj_bucket { + struct list_head list; + int count; +}; + +/* yaffs_checkpt_obj holds the definition of an object as dumped + * by checkpointing. + */ + +struct yaffs_checkpt_obj { + int struct_type; + u32 obj_id; + u32 parent_id; + int hdr_chunk; + enum yaffs_obj_type variant_type:3; + u8 deleted:1; + u8 soft_del:1; + u8 unlinked:1; + u8 fake:1; + u8 rename_allowed:1; + u8 unlink_allowed:1; + u8 serial; + int n_data_chunks; + loff_t size_or_equiv_obj; +}; + +/*--------------------- Temporary buffers ---------------- + * + * These are chunk-sized working buffers. Each device has a few. + */ + +struct yaffs_buffer { + u8 *buffer; + int in_use; +}; + +/*----------------- Device ---------------------------------*/ + +struct yaffs_param { + const YCHAR *name; + + /* + * Entry parameters set up way early. Yaffs sets up the rest. + * The structure should be zeroed out before use so that unused + * and default values are zero. + */ + + int inband_tags; /* Use unband tags */ + u32 total_bytes_per_chunk; /* Should be >= 512, does not need to + be a power of 2 */ + int chunks_per_block; /* does not need to be a power of 2 */ + int spare_bytes_per_chunk; /* spare area size */ + int start_block; /* Start block we're allowed to use */ + int end_block; /* End block we're allowed to use */ + int n_reserved_blocks; /* Tuneable so that we can reduce + * reserved blocks on NOR and RAM. */ + + int n_caches; /* If <= 0, then short op caching is disabled, + * else the number of short op caches. + */ + int cache_bypass_aligned; /* If non-zero then bypass the cache for + * aligned writes. + */ + + int use_nand_ecc; /* Flag to decide whether or not to use + * NAND driver ECC on data (yaffs1) */ + int tags_9bytes; /* Use 9 byte tags */ + int no_tags_ecc; /* Flag to decide whether or not to do ECC + * on packed tags (yaffs2) */ + + int is_yaffs2; /* Use yaffs2 mode on this device */ + + int empty_lost_n_found; /* Auto-empty lost+found directory on mount */ + + int refresh_period; /* How often to check for a block refresh */ + + /* Checkpoint control. Can be set before or after initialisation */ + u8 skip_checkpt_rd; + u8 skip_checkpt_wr; + + int enable_xattr; /* Enable xattribs */ + + int max_objects; /* + * Set to limit the number of objects created. + * 0 = no limit. + */ + + /* The remove_obj_fn function must be supplied by OS flavours that + * need it. + * yaffs direct uses it to implement the faster readdir. + * Linux uses it to protect the directory during unlocking. + */ + void (*remove_obj_fn) (struct yaffs_obj *obj); + + /* Callback to mark the superblock dirty */ + void (*sb_dirty_fn) (struct yaffs_dev *dev); + + /* Callback to control garbage collection. */ + unsigned (*gc_control_fn) (struct yaffs_dev *dev); + + /* Debug control flags. Don't use unless you know what you're doing */ + int use_header_file_size; /* Flag to determine if we should use + * file sizes from the header */ + int disable_lazy_load; /* Disable lazy loading on this device */ + int wide_tnodes_disabled; /* Set to disable wide tnodes */ + int disable_soft_del; /* yaffs 1 only: Set to disable the use of + * softdeletion. */ + + int defered_dir_update; /* Set to defer directory updates */ + +#ifdef CONFIG_YAFFS_AUTO_UNICODE + int auto_unicode; +#endif + int always_check_erased; /* Force chunk erased check always on */ + + int disable_summary; + int disable_bad_block_marking; + +}; + +struct yaffs_driver { + int (*drv_write_chunk_fn) (struct yaffs_dev *dev, int nand_chunk, + const u8 *data, int data_len, + const u8 *oob, int oob_len); + int (*drv_read_chunk_fn) (struct yaffs_dev *dev, int nand_chunk, + u8 *data, int data_len, + u8 *oob, int oob_len, + enum yaffs_ecc_result *ecc_result); + int (*drv_erase_fn) (struct yaffs_dev *dev, int block_no); + int (*drv_mark_bad_fn) (struct yaffs_dev *dev, int block_no); + int (*drv_check_bad_fn) (struct yaffs_dev *dev, int block_no); + int (*drv_initialise_fn) (struct yaffs_dev *dev); + int (*drv_deinitialise_fn) (struct yaffs_dev *dev); +}; + +struct yaffs_tags_handler { + int (*write_chunk_tags_fn) (struct yaffs_dev *dev, + int nand_chunk, const u8 *data, + const struct yaffs_ext_tags *tags); + int (*read_chunk_tags_fn) (struct yaffs_dev *dev, + int nand_chunk, u8 *data, + struct yaffs_ext_tags *tags); + + int (*query_block_fn) (struct yaffs_dev *dev, int block_no, + enum yaffs_block_state *state, + u32 *seq_number); + int (*mark_bad_fn) (struct yaffs_dev *dev, int block_no); +}; + +struct yaffs_dev { + struct yaffs_param param; + struct yaffs_driver drv; + struct yaffs_tags_handler tagger; + + /* Context storage. Holds extra OS specific data for this device */ + + void *os_context; + void *driver_context; + + struct list_head dev_list; + + int ll_init; + /* Runtime parameters. Set up by YAFFS. */ + int data_bytes_per_chunk; + + /* Non-wide tnode stuff */ + u16 chunk_grp_bits; /* Number of bits that need to be resolved if + * the tnodes are not wide enough. + */ + u16 chunk_grp_size; /* == 2^^chunk_grp_bits */ + + /* Stuff to support wide tnodes */ + u32 tnode_width; + u32 tnode_mask; + u32 tnode_size; + + /* Stuff for figuring out file offset to chunk conversions */ + u32 chunk_shift; /* Shift value */ + u32 chunk_div; /* Divisor after shifting: 1 for 2^n sizes */ + u32 chunk_mask; /* Mask to use for power-of-2 case */ + + int is_mounted; + int read_only; + int is_checkpointed; + + /* Stuff to support block offsetting to support start block zero */ + int internal_start_block; + int internal_end_block; + int block_offset; + int chunk_offset; + + /* Runtime checkpointing stuff */ + int checkpt_page_seq; /* running sequence number of checkpt pages */ + int checkpt_byte_count; + int checkpt_byte_offs; + u8 *checkpt_buffer; + int checkpt_open_write; + int blocks_in_checkpt; + int checkpt_cur_chunk; + int checkpt_cur_block; + int checkpt_next_block; + int *checkpt_block_list; + int checkpt_max_blocks; + u32 checkpt_sum; + u32 checkpt_xor; + + int checkpoint_blocks_required; /* Number of blocks needed to store + * current checkpoint set */ + + /* Block Info */ + struct yaffs_block_info *block_info; + u8 *chunk_bits; /* bitmap of chunks in use */ + unsigned block_info_alt:1; /* allocated using alternative alloc */ + unsigned chunk_bits_alt:1; /* allocated using alternative alloc */ + int chunk_bit_stride; /* Number of bytes of chunk_bits per block. + * Must be consistent with chunks_per_block. + */ + + int n_erased_blocks; + int alloc_block; /* Current block being allocated off */ + u32 alloc_page; + int alloc_block_finder; /* Used to search for next allocation block */ + + /* Object and Tnode memory management */ + void *allocator; + int n_obj; + int n_tnodes; + + int n_hardlinks; + + struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS]; + u32 bucket_finder; + + int n_free_chunks; + + /* Garbage collection control */ + u32 *gc_cleanup_list; /* objects to delete at the end of a GC. */ + u32 n_clean_ups; + + unsigned has_pending_prioritised_gc; /* We think this device might + have pending prioritised gcs */ + unsigned gc_disable; + unsigned gc_block_finder; + unsigned gc_dirtiest; + unsigned gc_pages_in_use; + unsigned gc_not_done; + unsigned gc_block; + unsigned gc_chunk; + unsigned gc_skip; + struct yaffs_summary_tags *gc_sum_tags; + + /* Special directories */ + struct yaffs_obj *root_dir; + struct yaffs_obj *lost_n_found; + + int buffered_block; /* Which block is buffered here? */ + int doing_buffered_block_rewrite; + + struct yaffs_cache *cache; + int cache_last_use; + + /* Stuff for background deletion and unlinked files. */ + struct yaffs_obj *unlinked_dir; /* Directory where unlinked and deleted + files live. */ + struct yaffs_obj *del_dir; /* Directory where deleted objects are + sent to disappear. */ + struct yaffs_obj *unlinked_deletion; /* Current file being + background deleted. */ + int n_deleted_files; /* Count of files awaiting deletion; */ + int n_unlinked_files; /* Count of unlinked files. */ + int n_bg_deletions; /* Count of background deletions. */ + + /* Temporary buffer management */ + struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS]; + int max_temp; + int temp_in_use; + int unmanaged_buffer_allocs; + int unmanaged_buffer_deallocs; + + /* yaffs2 runtime stuff */ + unsigned seq_number; /* Sequence number of currently + allocating block */ + unsigned oldest_dirty_seq; + unsigned oldest_dirty_block; + + /* Block refreshing */ + int refresh_skip; /* A skip down counter. + * Refresh happens when this gets to zero. */ + + /* Dirty directory handling */ + struct list_head dirty_dirs; /* List of dirty directories */ + + /* Summary */ + int chunks_per_summary; + struct yaffs_summary_tags *sum_tags; + + /* Statistics */ + u32 n_page_writes; + u32 n_page_reads; + u32 n_erasures; + u32 n_bad_markings; + u32 n_erase_failures; + u32 n_gc_copies; + u32 all_gcs; + u32 passive_gc_count; + u32 oldest_dirty_gc_count; + u32 n_gc_blocks; + u32 bg_gcs; + u32 n_retried_writes; + u32 n_retired_blocks; + u32 n_ecc_fixed; + u32 n_ecc_unfixed; + u32 n_tags_ecc_fixed; + u32 n_tags_ecc_unfixed; + u32 n_deletions; + u32 n_unmarked_deletions; + u32 refresh_count; + u32 cache_hits; + u32 tags_used; + u32 summary_used; + +}; + +/* The CheckpointDevice structure holds the device information that changes + *at runtime and must be preserved over unmount/mount cycles. + */ +struct yaffs_checkpt_dev { + int struct_type; + int n_erased_blocks; + int alloc_block; /* Current block being allocated off */ + u32 alloc_page; + int n_free_chunks; + + int n_deleted_files; /* Count of files awaiting deletion; */ + int n_unlinked_files; /* Count of unlinked files. */ + int n_bg_deletions; /* Count of background deletions. */ + + /* yaffs2 runtime stuff */ + unsigned seq_number; /* Sequence number of currently + * allocating block */ + +}; + +struct yaffs_checkpt_validity { + int struct_type; + u32 magic; + u32 version; + u32 head; +}; + +struct yaffs_shadow_fixer { + int obj_id; + int shadowed_id; + struct yaffs_shadow_fixer *next; +}; + +/* Structure for doing xattr modifications */ +struct yaffs_xattr_mod { + int set; /* If 0 then this is a deletion */ + const YCHAR *name; + const void *data; + int size; + int flags; + int result; +}; + +/*----------------------- YAFFS Functions -----------------------*/ + +int yaffs_guts_initialise(struct yaffs_dev *dev); +void yaffs_deinitialise(struct yaffs_dev *dev); + +int yaffs_get_n_free_chunks(struct yaffs_dev *dev); + +int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name, + struct yaffs_obj *new_dir, const YCHAR * new_name); + +int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name); +int yaffs_del_obj(struct yaffs_obj *obj); + +int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size); +loff_t yaffs_get_obj_length(struct yaffs_obj *obj); +int yaffs_get_obj_inode(struct yaffs_obj *obj); +unsigned yaffs_get_obj_type(struct yaffs_obj *obj); +int yaffs_get_obj_link_count(struct yaffs_obj *obj); + +/* File operations */ +int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset, + int n_bytes); +int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset, + int n_bytes, int write_trhrough); +int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size); + +struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, + const YCHAR *name, u32 mode, u32 uid, + u32 gid); + +int yaffs_flush_file(struct yaffs_obj *obj, int update_time, int data_sync); + +/* Flushing and checkpointing */ +void yaffs_flush_whole_cache(struct yaffs_dev *dev); + +int yaffs_checkpoint_save(struct yaffs_dev *dev); +int yaffs_checkpoint_restore(struct yaffs_dev *dev); + +/* Directory operations */ +struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name, + u32 mode, u32 uid, u32 gid); +struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir, + const YCHAR *name); +struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number); + +/* Link operations */ +struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name, + struct yaffs_obj *equiv_obj); + +struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj); + +/* Symlink operations */ +struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, + const YCHAR *name, u32 mode, u32 uid, + u32 gid, const YCHAR *alias); +YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj); + +/* Special inodes (fifos, sockets and devices) */ +struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, + const YCHAR *name, u32 mode, u32 uid, + u32 gid, u32 rdev); + +int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name, + const void *value, int size, int flags); +int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value, + int size); +int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size); +int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name); + +/* Special directories */ +struct yaffs_obj *yaffs_root(struct yaffs_dev *dev); +struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev); + +void yaffs_handle_defered_free(struct yaffs_obj *obj); + +void yaffs_update_dirty_dirs(struct yaffs_dev *dev); + +int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency); + +/* Debug dump */ +int yaffs_dump_obj(struct yaffs_obj *obj); + +void yaffs_guts_test(struct yaffs_dev *dev); +int yaffs_guts_ll_init(struct yaffs_dev *dev); + + +/* A few useful functions to be used within the core files*/ +void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash, + int lyn); +int yaffs_check_ff(u8 *buffer, int n_bytes); +void yaffs_handle_chunk_error(struct yaffs_dev *dev, + struct yaffs_block_info *bi); + +u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev); +void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer); + +struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev, + int number, + enum yaffs_obj_type type); +int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk, + int nand_chunk, int in_scan); +void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name); +void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj, + const struct yaffs_obj_hdr *oh); +void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj); +YCHAR *yaffs_clone_str(const YCHAR *str); +void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list); +void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no); +int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, + int force, int is_shrink, int shadows, + struct yaffs_xattr_mod *xop); +void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id, + int backward_scanning); +int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks); +struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev); +struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev, + struct yaffs_file_var *file_struct, + u32 chunk_id, + struct yaffs_tnode *passed_tn); + +int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset, + int n_bytes, int write_trhrough); +void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size); +void yaffs_skip_rest_of_block(struct yaffs_dev *dev); + +int yaffs_count_free_chunks(struct yaffs_dev *dev); + +struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev, + struct yaffs_file_var *file_struct, + u32 chunk_id); + +u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn, + unsigned pos); + +int yaffs_is_non_empty_dir(struct yaffs_obj *obj); + +int yaffs_format_dev(struct yaffs_dev *dev); + +void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr, + int *chunk_out, u32 *offset_out); +/* + * Marshalling functions to get loff_t file sizes into aand out of + * object headers. + */ +void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize); +loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh); +loff_t yaffs_max_file_size(struct yaffs_dev *dev); + +/* + * Debug function to count number of blocks in each state + * NB Needs to be called with correct number of integers + */ + +void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]); + +int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, + struct yaffs_ext_tags *tags); + +#endif diff --git a/fs/yaffs2/yaffs_linux.h b/fs/yaffs2/yaffs_linux.h new file mode 100644 index 000000000000..c20ab14b7fa2 --- /dev/null +++ b/fs/yaffs2/yaffs_linux.h @@ -0,0 +1,48 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_LINUX_H__ +#define __YAFFS_LINUX_H__ + +#include "yportenv.h" + +struct yaffs_linux_context { + struct list_head context_list; /* List of these we have mounted */ + struct yaffs_dev *dev; + struct super_block *super; + struct task_struct *bg_thread; /* Background thread for this device */ + int bg_running; + struct mutex gross_lock; /* Gross locking mutex*/ + u8 *spare_buffer; /* For mtdif2 use. Don't know the buffer size + * at compile time so we have to allocate it. + */ + struct list_head search_contexts; + struct task_struct *readdir_process; + unsigned mount_id; + int dirty; +}; + +#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context)) +#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context)) + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) +#define WRITE_SIZE_STR "writesize" +#define WRITE_SIZE(mtd) ((mtd)->writesize) +#else +#define WRITE_SIZE_STR "oobblock" +#define WRITE_SIZE(mtd) ((mtd)->oobblock) +#endif + +#endif diff --git a/fs/yaffs2/yaffs_mtdif.c b/fs/yaffs2/yaffs_mtdif.c new file mode 100644 index 000000000000..4ff5741f3983 --- /dev/null +++ b/fs/yaffs2/yaffs_mtdif.c @@ -0,0 +1,300 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yportenv.h" + +#include "yaffs_mtdif.h" + +#include "linux/mtd/mtd.h" +#include "linux/types.h" +#include "linux/time.h" +#include "linux/mtd/rawnand.h" +#include "linux/kernel.h" +#include "linux/version.h" +#include "linux/types.h" + +#include "uapi/linux/major.h" + +#include "yaffs_trace.h" +#include "yaffs_guts.h" +#include "yaffs_linux.h" + + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)) +#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO +#endif + + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)) +#define mtd_erase(m, ei) (m)->erase(m, ei) +#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops) +#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops) +#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs) +#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs) +#endif + + + +int nandmtd_erase_block(struct yaffs_dev *dev, int block_no) +{ + struct mtd_info *mtd = yaffs_dev_to_mtd(dev); + u32 addr = + ((loff_t) block_no) * dev->param.total_bytes_per_chunk * + dev->param.chunks_per_block; + struct erase_info ei; + int retval = 0; + + ei.addr = addr; + ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block; + + retval = mtd_erase(mtd, &ei); + + if (retval == 0) + return YAFFS_OK; + + return YAFFS_FAIL; +} + + +static int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk, + const u8 *data, int data_len, + const u8 *oob, int oob_len) +{ + struct mtd_info *mtd = yaffs_dev_to_mtd(dev); + loff_t addr; + struct mtd_oob_ops ops; + int retval; + + yaffs_trace(YAFFS_TRACE_MTD, + "yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n", + dev, nand_chunk, data, data_len, oob, oob_len); + + if (!data || !data_len) { + data = NULL; + data_len = 0; + } + + if (!oob || !oob_len) { + oob = NULL; + oob_len = 0; + } + + addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk; + memset(&ops, 0, sizeof(ops)); + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = (data) ? data_len : 0; + ops.ooblen = oob_len; + ops.datbuf = (u8 *)data; + ops.oobbuf = (u8 *)oob; + + retval = mtd_write_oob(mtd, addr, &ops); + if (retval) { + yaffs_trace(YAFFS_TRACE_MTD, + "write_oob failed, chunk %d, mtd error %d", + nand_chunk, retval); + } + return retval ? YAFFS_FAIL : YAFFS_OK; +} + +static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk, + u8 *data, int data_len, + u8 *oob, int oob_len, + enum yaffs_ecc_result *ecc_result) +{ + struct mtd_info *mtd = yaffs_dev_to_mtd(dev); + loff_t addr; + struct mtd_oob_ops ops; + int retval; + + addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk; + memset(&ops, 0, sizeof(ops)); + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = (data) ? data_len : 0; + ops.ooblen = oob_len; + ops.datbuf = data; + ops.oobbuf = oob; + +#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 20)) + /* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug; + * help it out with ops.len = ops.ooblen when ops.datbuf == NULL. + */ + ops.len = (ops.datbuf) ? ops.len : ops.ooblen; +#endif + /* Read page and oob using MTD. + * Check status and determine ECC result. + */ + retval = mtd_read_oob(mtd, addr, &ops); + if (retval) + yaffs_trace(YAFFS_TRACE_MTD, + "read_oob failed, chunk %d, mtd error %d", + nand_chunk, retval); + + switch (retval) { + case 0: + /* no error */ + if(ecc_result) + *ecc_result = YAFFS_ECC_RESULT_NO_ERROR; + break; + + case -EUCLEAN: + /* MTD's ECC fixed the data */ + if(ecc_result) + *ecc_result = YAFFS_ECC_RESULT_FIXED; + dev->n_ecc_fixed++; + break; + + case -EBADMSG: + default: + /* MTD's ECC could not fix the data */ + dev->n_ecc_unfixed++; + if(ecc_result) + *ecc_result = YAFFS_ECC_RESULT_UNFIXED; + return YAFFS_FAIL; + } + + return YAFFS_OK; +} + +static int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no) +{ + struct mtd_info *mtd = yaffs_dev_to_mtd(dev); + + loff_t addr; + struct erase_info ei; + int retval = 0; + u32 block_size; + + block_size = dev->param.total_bytes_per_chunk * + dev->param.chunks_per_block; + addr = ((loff_t) block_no) * block_size; + + ei.addr = addr; + ei.len = block_size; + + retval = mtd_erase(mtd, &ei); + + if (retval == 0) + return YAFFS_OK; + + return YAFFS_FAIL; +} + +static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no) +{ + struct mtd_info *mtd = yaffs_dev_to_mtd(dev); + int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk; + int retval; + + yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no); + + retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no); + return (retval) ? YAFFS_FAIL : YAFFS_OK; +} + +static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no) +{ + struct mtd_info *mtd = yaffs_dev_to_mtd(dev); + int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk; + int retval; + + yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no); + + retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no); + return (retval) ? YAFFS_FAIL : YAFFS_OK; +} + +static int yaffs_mtd_initialise(struct yaffs_dev *dev) +{ + return YAFFS_OK; +} + +static int yaffs_mtd_deinitialise(struct yaffs_dev *dev) +{ + return YAFFS_OK; +} + + +void yaffs_mtd_drv_install(struct yaffs_dev *dev) +{ + struct yaffs_driver *drv = &dev->drv; + + drv->drv_write_chunk_fn = yaffs_mtd_write; + drv->drv_read_chunk_fn = yaffs_mtd_read; + drv->drv_erase_fn = yaffs_mtd_erase; + drv->drv_mark_bad_fn = yaffs_mtd_mark_bad; + drv->drv_check_bad_fn = yaffs_mtd_check_bad; + drv->drv_initialise_fn = yaffs_mtd_initialise; + drv->drv_deinitialise_fn = yaffs_mtd_deinitialise; +} + + +struct mtd_info * yaffs_get_mtd_device(dev_t sdev) +{ + struct mtd_info *mtd; + + mtd = yaffs_get_mtd_device(sdev); + + /* Check it's an mtd device..... */ + if (MAJOR(sdev) != MTD_BLOCK_MAJOR) + return NULL; /* This isn't an mtd device */ + + /* Check it's NAND */ + if (mtd->type != MTD_NANDFLASH) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs: MTD device is not NAND it's type %d", + mtd->type); + return NULL; + } + + yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd)); + yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize); + yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) + yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size); +#else + yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size); +#endif + + return mtd; +} + +int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags) +{ + if (yaffs_version == 2) { + if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE || + mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) && + !inband_tags) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device does not have the right page sizes" + ); + return -1; + } + } else { + if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK || + mtd->oobsize != YAFFS_BYTES_PER_SPARE) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device does not support have the right page sizes" + ); + return -1; + } + } + + return 0; +} + + +void yaffs_put_mtd_device(struct mtd_info *mtd) +{ + if(mtd) + put_mtd_device(mtd); +} diff --git a/fs/yaffs2/yaffs_mtdif.h b/fs/yaffs2/yaffs_mtdif.h new file mode 100644 index 000000000000..9cff224c6dec --- /dev/null +++ b/fs/yaffs2/yaffs_mtdif.h @@ -0,0 +1,25 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_MTDIF_H__ +#define __YAFFS_MTDIF_H__ + +#include "yaffs_guts.h" + +void yaffs_mtd_drv_install(struct yaffs_dev *dev); +struct mtd_info * yaffs_get_mtd_device(dev_t sdev); +void yaffs_put_mtd_device(struct mtd_info *mtd); +int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags); +#endif diff --git a/fs/yaffs2/yaffs_nameval.c b/fs/yaffs2/yaffs_nameval.c new file mode 100644 index 000000000000..4bdf4ed743a7 --- /dev/null +++ b/fs/yaffs2/yaffs_nameval.c @@ -0,0 +1,208 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * This simple implementation of a name-value store assumes a small number of +* values and fits into a small finite buffer. + * + * Each attribute is stored as a record: + * sizeof(int) bytes record size. + * strnlen+1 bytes name null terminated. + * nbytes value. + * ---------- + * total size stored in record size + * + * This code has not been tested with unicode yet. + */ + +#include "yaffs_nameval.h" + +#include "yportenv.h" + +static int nval_find(const char *xb, int xb_size, const YCHAR *name, + int *exist_size) +{ + int pos = 0; + int size; + + memcpy(&size, xb, sizeof(int)); + while (size > 0 && (size < xb_size) && (pos + size < xb_size)) { + if (!strncmp((YCHAR *) (xb + pos + sizeof(int)), + name, size)) { + if (exist_size) + *exist_size = size; + return pos; + } + pos += size; + if (pos < xb_size - sizeof(int)) + memcpy(&size, xb + pos, sizeof(int)); + else + size = 0; + } + if (exist_size) + *exist_size = 0; + return -ENODATA; +} + +static int nval_used(const char *xb, int xb_size) +{ + int pos = 0; + int size; + + memcpy(&size, xb + pos, sizeof(int)); + while (size > 0 && (size < xb_size) && (pos + size < xb_size)) { + pos += size; + if (pos < xb_size - sizeof(int)) + memcpy(&size, xb + pos, sizeof(int)); + else + size = 0; + } + return pos; +} + +int nval_del(char *xb, int xb_size, const YCHAR *name) +{ + int pos = nval_find(xb, xb_size, name, NULL); + int size; + + if (pos < 0 || pos >= xb_size) + return -ENODATA; + + /* Find size, shift rest over this record, + * then zero out the rest of buffer */ + memcpy(&size, xb + pos, sizeof(int)); + memcpy(xb + pos, xb + pos + size, xb_size - (pos + size)); + memset(xb + (xb_size - size), 0, size); + return 0; +} + +int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, + int bsize, int flags) +{ + int pos; + int namelen = strnlen(name, xb_size); + int reclen; + int size_exist = 0; + int space; + int start; + + pos = nval_find(xb, xb_size, name, &size_exist); + + if (flags & XATTR_CREATE && pos >= 0) + return -EEXIST; + if (flags & XATTR_REPLACE && pos < 0) + return -ENODATA; + + start = nval_used(xb, xb_size); + space = xb_size - start + size_exist; + + reclen = (sizeof(int) + namelen + 1 + bsize); + + if (reclen > space) + return -ENOSPC; + + if (pos >= 0) { + nval_del(xb, xb_size, name); + start = nval_used(xb, xb_size); + } + + pos = start; + + memcpy(xb + pos, &reclen, sizeof(int)); + pos += sizeof(int); + strncpy((YCHAR *) (xb + pos), name, reclen); + pos += (namelen + 1); + memcpy(xb + pos, buf, bsize); + return 0; +} + +int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf, + int bsize) +{ + int pos = nval_find(xb, xb_size, name, NULL); + int size; + + if (pos >= 0 && pos < xb_size) { + + memcpy(&size, xb + pos, sizeof(int)); + pos += sizeof(int); /* advance past record length */ + size -= sizeof(int); + + /* Advance over name string */ + while (xb[pos] && size > 0 && pos < xb_size) { + pos++; + size--; + } + /*Advance over NUL */ + pos++; + size--; + + /* If bsize is zero then this is a size query. + * Return the size, but don't copy. + */ + if (!bsize) + return size; + + if (size <= bsize) { + memcpy(buf, xb + pos, size); + return size; + } + } + if (pos >= 0) + return -ERANGE; + + return -ENODATA; +} + +int nval_list(const char *xb, int xb_size, char *buf, int bsize) +{ + int pos = 0; + int size; + int name_len; + int ncopied = 0; + int filled = 0; + + memcpy(&size, xb + pos, sizeof(int)); + while (size > sizeof(int) && + size <= xb_size && + (pos + size) < xb_size && + !filled) { + pos += sizeof(int); + size -= sizeof(int); + name_len = strnlen((YCHAR *) (xb + pos), size); + if (ncopied + name_len + 1 < bsize) { + memcpy(buf, xb + pos, name_len * sizeof(YCHAR)); + buf += name_len; + *buf = '\0'; + buf++; + if (sizeof(YCHAR) > 1) { + *buf = '\0'; + buf++; + } + ncopied += (name_len + 1); + } else { + filled = 1; + } + pos += size; + if (pos < xb_size - sizeof(int)) + memcpy(&size, xb + pos, sizeof(int)); + else + size = 0; + } + return ncopied; +} + +int nval_hasvalues(const char *xb, int xb_size) +{ + return nval_used(xb, xb_size) > 0; +} diff --git a/fs/yaffs2/yaffs_nameval.h b/fs/yaffs2/yaffs_nameval.h new file mode 100644 index 000000000000..951e64f872b6 --- /dev/null +++ b/fs/yaffs2/yaffs_nameval.h @@ -0,0 +1,28 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __NAMEVAL_H__ +#define __NAMEVAL_H__ + +#include "yportenv.h" + +int nval_del(char *xb, int xb_size, const YCHAR * name); +int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf, + int bsize, int flags); +int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf, + int bsize); +int nval_list(const char *xb, int xb_size, char *buf, int bsize); +int nval_hasvalues(const char *xb, int xb_size); +#endif diff --git a/fs/yaffs2/yaffs_nand.c b/fs/yaffs2/yaffs_nand.c new file mode 100644 index 000000000000..0d8499bdc630 --- /dev/null +++ b/fs/yaffs2/yaffs_nand.c @@ -0,0 +1,122 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_nand.h" +#include "yaffs_tagscompat.h" + +#include "yaffs_getblockinfo.h" +#include "yaffs_summary.h" + +static int apply_chunk_offset(struct yaffs_dev *dev, int chunk) +{ + return chunk - dev->chunk_offset; +} + +int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk, + u8 *buffer, struct yaffs_ext_tags *tags) +{ + int result; + struct yaffs_ext_tags local_tags; + int flash_chunk = apply_chunk_offset(dev, nand_chunk); + + dev->n_page_reads++; + + /* If there are no tags provided use local tags. */ + if (!tags) + tags = &local_tags; + + result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags); + if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) { + + struct yaffs_block_info *bi; + bi = yaffs_get_block_info(dev, + nand_chunk / + dev->param.chunks_per_block); + yaffs_handle_chunk_error(dev, bi); + } + return result; +} + +int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev, + int nand_chunk, + const u8 *buffer, struct yaffs_ext_tags *tags) +{ + int result; + int flash_chunk = apply_chunk_offset(dev, nand_chunk); + + dev->n_page_writes++; + + if (!tags) { + yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags"); + BUG(); + return YAFFS_FAIL; + } + + tags->seq_number = dev->seq_number; + tags->chunk_used = 1; + yaffs_trace(YAFFS_TRACE_WRITE, + "Writing chunk %d tags %d %d", + nand_chunk, tags->obj_id, tags->chunk_id); + + result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk, + buffer, tags); + + yaffs_summary_add(dev, tags, nand_chunk); + + return result; +} + +int yaffs_mark_bad(struct yaffs_dev *dev, int block_no) +{ + block_no -= dev->block_offset; + dev->n_bad_markings++; + + if (dev->param.disable_bad_block_marking) + return YAFFS_OK; + + return dev->tagger.mark_bad_fn(dev, block_no); +} + + +int yaffs_query_init_block_state(struct yaffs_dev *dev, + int block_no, + enum yaffs_block_state *state, + u32 *seq_number) +{ + block_no -= dev->block_offset; + return dev->tagger.query_block_fn(dev, block_no, state, seq_number); +} + +int yaffs_erase_block(struct yaffs_dev *dev, int block_no) +{ + int result; + + block_no -= dev->block_offset; + dev->n_erasures++; + result = dev->drv.drv_erase_fn(dev, block_no); + return result; +} + +int yaffs_init_nand(struct yaffs_dev *dev) +{ + if (dev->drv.drv_initialise_fn) + return dev->drv.drv_initialise_fn(dev); + return YAFFS_OK; +} + +int yaffs_deinit_nand(struct yaffs_dev *dev) +{ + if (dev->drv.drv_deinitialise_fn) + return dev->drv.drv_deinitialise_fn(dev); + return YAFFS_OK; +} diff --git a/fs/yaffs2/yaffs_nand.h b/fs/yaffs2/yaffs_nand.h new file mode 100644 index 000000000000..804e97ad66d0 --- /dev/null +++ b/fs/yaffs2/yaffs_nand.h @@ -0,0 +1,39 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_NAND_H__ +#define __YAFFS_NAND_H__ +#include "yaffs_guts.h" + +int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk, + u8 *buffer, struct yaffs_ext_tags *tags); + +int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev, + int nand_chunk, + const u8 *buffer, struct yaffs_ext_tags *tags); + +int yaffs_mark_bad(struct yaffs_dev *dev, int block_no); + +int yaffs_query_init_block_state(struct yaffs_dev *dev, + int block_no, + enum yaffs_block_state *state, + unsigned *seq_number); + +int yaffs_erase_block(struct yaffs_dev *dev, int flash_block); + +int yaffs_init_nand(struct yaffs_dev *dev); +int yaffs_deinit_nand(struct yaffs_dev *dev); + +#endif diff --git a/fs/yaffs2/yaffs_packedtags1.c b/fs/yaffs2/yaffs_packedtags1.c new file mode 100644 index 000000000000..dd9a331d8fc4 --- /dev/null +++ b/fs/yaffs2/yaffs_packedtags1.c @@ -0,0 +1,56 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_packedtags1.h" +#include "yportenv.h" + +static const u8 all_ff[20] = { + 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff +}; + +void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt, + const struct yaffs_ext_tags *t) +{ + pt->chunk_id = t->chunk_id; + pt->serial_number = t->serial_number; + pt->n_bytes = t->n_bytes; + pt->obj_id = t->obj_id; + pt->ecc = 0; + pt->deleted = (t->is_deleted) ? 0 : 1; + pt->unused_stuff = 0; + pt->should_be_ff = 0xffffffff; +} + +void yaffs_unpack_tags1(struct yaffs_ext_tags *t, + const struct yaffs_packed_tags1 *pt) +{ + + if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) { + t->block_bad = 0; + if (pt->should_be_ff != 0xffffffff) + t->block_bad = 1; + t->chunk_used = 1; + t->obj_id = pt->obj_id; + t->chunk_id = pt->chunk_id; + t->n_bytes = pt->n_bytes; + t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR; + t->is_deleted = (pt->deleted) ? 0 : 1; + t->serial_number = pt->serial_number; + } else { + memset(t, 0, sizeof(struct yaffs_ext_tags)); + } +} diff --git a/fs/yaffs2/yaffs_packedtags1.h b/fs/yaffs2/yaffs_packedtags1.h new file mode 100644 index 000000000000..b80f0a5b1574 --- /dev/null +++ b/fs/yaffs2/yaffs_packedtags1.h @@ -0,0 +1,39 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +/* This is used to pack YAFFS1 tags, not YAFFS2 tags. */ + +#ifndef __YAFFS_PACKEDTAGS1_H__ +#define __YAFFS_PACKEDTAGS1_H__ + +#include "yaffs_guts.h" + +struct yaffs_packed_tags1 { + unsigned chunk_id:20; + unsigned serial_number:2; + unsigned n_bytes:10; + unsigned obj_id:18; + unsigned ecc:12; + unsigned deleted:1; + unsigned unused_stuff:1; + unsigned should_be_ff; + +}; + +void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt, + const struct yaffs_ext_tags *t); +void yaffs_unpack_tags1(struct yaffs_ext_tags *t, + const struct yaffs_packed_tags1 *pt); +#endif diff --git a/fs/yaffs2/yaffs_packedtags2.c b/fs/yaffs2/yaffs_packedtags2.c new file mode 100644 index 000000000000..e1d18cc33c68 --- /dev/null +++ b/fs/yaffs2/yaffs_packedtags2.c @@ -0,0 +1,197 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_packedtags2.h" +#include "yportenv.h" +#include "yaffs_trace.h" + +/* This code packs a set of extended tags into a binary structure for + * NAND storage + */ + +/* Some of the information is "extra" struff which can be packed in to + * speed scanning + * This is defined by having the EXTRA_HEADER_INFO_FLAG set. + */ + +/* Extra flags applied to chunk_id */ + +#define EXTRA_HEADER_INFO_FLAG 0x80000000 +#define EXTRA_SHRINK_FLAG 0x40000000 +#define EXTRA_SHADOWS_FLAG 0x20000000 +#define EXTRA_SPARE_FLAGS 0x10000000 + +#define ALL_EXTRA_FLAGS 0xf0000000 + +/* Also, the top 4 bits of the object Id are set to the object type. */ +#define EXTRA_OBJECT_TYPE_SHIFT (28) +#define EXTRA_OBJECT_TYPE_MASK ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT) + +static void yaffs_dump_packed_tags2_tags_only( + const struct yaffs_packed_tags2_tags_only *ptt) +{ + yaffs_trace(YAFFS_TRACE_MTD, + "packed tags obj %d chunk %d byte %d seq %d", + ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number); +} + +static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt) +{ + yaffs_dump_packed_tags2_tags_only(&pt->t); +} + +static void yaffs_dump_tags2(const struct yaffs_ext_tags *t) +{ + yaffs_trace(YAFFS_TRACE_MTD, + "ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d", + t->ecc_result, t->block_bad, t->chunk_used, t->obj_id, + t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number, + t->seq_number); + +} + +static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t) +{ + if (t->chunk_id != 0 || !t->extra_available) + return 0; + + /* Check if the file size is too long to store */ + if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE && + (t->extra_file_size >> 31) != 0) + return 0; + return 1; +} + +void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt, + const struct yaffs_ext_tags *t) +{ + ptt->chunk_id = t->chunk_id; + ptt->seq_number = t->seq_number; + ptt->n_bytes = t->n_bytes; + ptt->obj_id = t->obj_id; + + /* Only store extra tags for object headers. + * If it is a file then only store if the file size is short\ + * enough to fit. + */ + if (yaffs_check_tags_extra_packable(t)) { + /* Store the extra header info instead */ + /* We save the parent object in the chunk_id */ + ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id; + if (t->extra_is_shrink) + ptt->chunk_id |= EXTRA_SHRINK_FLAG; + if (t->extra_shadows) + ptt->chunk_id |= EXTRA_SHADOWS_FLAG; + + ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK; + ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT); + + if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK) + ptt->n_bytes = t->extra_equiv_id; + else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE) + ptt->n_bytes = (unsigned) t->extra_file_size; + else + ptt->n_bytes = 0; + } + + yaffs_dump_packed_tags2_tags_only(ptt); + yaffs_dump_tags2(t); +} + +void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt, + const struct yaffs_ext_tags *t, int tags_ecc) +{ + yaffs_pack_tags2_tags_only(&pt->t, t); + + if (tags_ecc) + yaffs_ecc_calc_other((unsigned char *)&pt->t, + sizeof(struct yaffs_packed_tags2_tags_only), + &pt->ecc); +} + +void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t, + struct yaffs_packed_tags2_tags_only *ptt) +{ + memset(t, 0, sizeof(struct yaffs_ext_tags)); + + if (ptt->seq_number == 0xffffffff) + return; + + t->block_bad = 0; + t->chunk_used = 1; + t->obj_id = ptt->obj_id; + t->chunk_id = ptt->chunk_id; + t->n_bytes = ptt->n_bytes; + t->is_deleted = 0; + t->serial_number = 0; + t->seq_number = ptt->seq_number; + + /* Do extra header info stuff */ + if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) { + t->chunk_id = 0; + t->n_bytes = 0; + + t->extra_available = 1; + t->extra_parent_id = ptt->chunk_id & (~(ALL_EXTRA_FLAGS)); + t->extra_is_shrink = ptt->chunk_id & EXTRA_SHRINK_FLAG ? 1 : 0; + t->extra_shadows = ptt->chunk_id & EXTRA_SHADOWS_FLAG ? 1 : 0; + t->extra_obj_type = ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT; + t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK; + + if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK) + t->extra_equiv_id = ptt->n_bytes; + else + t->extra_file_size = ptt->n_bytes; + } + yaffs_dump_packed_tags2_tags_only(ptt); + yaffs_dump_tags2(t); +} + +void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt, + int tags_ecc) +{ + enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR; + + if (pt->t.seq_number != 0xffffffff && tags_ecc) { + /* Chunk is in use and we need to do ECC */ + + struct yaffs_ecc_other ecc; + int result; + yaffs_ecc_calc_other((unsigned char *)&pt->t, + sizeof(struct yaffs_packed_tags2_tags_only), + &ecc); + result = + yaffs_ecc_correct_other((unsigned char *)&pt->t, + sizeof(struct yaffs_packed_tags2_tags_only), + &pt->ecc, &ecc); + switch (result) { + case 0: + ecc_result = YAFFS_ECC_RESULT_NO_ERROR; + break; + case 1: + ecc_result = YAFFS_ECC_RESULT_FIXED; + break; + case -1: + ecc_result = YAFFS_ECC_RESULT_UNFIXED; + break; + default: + ecc_result = YAFFS_ECC_RESULT_UNKNOWN; + } + } + yaffs_unpack_tags2_tags_only(t, &pt->t); + + t->ecc_result = ecc_result; + + yaffs_dump_packed_tags2(pt); + yaffs_dump_tags2(t); +} diff --git a/fs/yaffs2/yaffs_packedtags2.h b/fs/yaffs2/yaffs_packedtags2.h new file mode 100644 index 000000000000..675e719460a8 --- /dev/null +++ b/fs/yaffs2/yaffs_packedtags2.h @@ -0,0 +1,47 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +/* This is used to pack YAFFS2 tags, not YAFFS1tags. */ + +#ifndef __YAFFS_PACKEDTAGS2_H__ +#define __YAFFS_PACKEDTAGS2_H__ + +#include "yaffs_guts.h" +#include "yaffs_ecc.h" + +struct yaffs_packed_tags2_tags_only { + unsigned seq_number; + unsigned obj_id; + unsigned chunk_id; + unsigned n_bytes; +}; + +struct yaffs_packed_tags2 { + struct yaffs_packed_tags2_tags_only t; + struct yaffs_ecc_other ecc; +}; + +/* Full packed tags with ECC, used for oob tags */ +void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt, + const struct yaffs_ext_tags *t, int tags_ecc); +void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt, + int tags_ecc); + +/* Only the tags part (no ECC for use with inband tags */ +void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt, + const struct yaffs_ext_tags *t); +void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t, + struct yaffs_packed_tags2_tags_only *pt); +#endif diff --git a/fs/yaffs2/yaffs_summary.c b/fs/yaffs2/yaffs_summary.c new file mode 100644 index 000000000000..6f3c7839fa6f --- /dev/null +++ b/fs/yaffs2/yaffs_summary.c @@ -0,0 +1,313 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* Summaries write the useful part of the tags for the chunks in a block into an + * an array which is written to the last n chunks of the block. + * Reading the summaries gives all the tags for the block in one read. Much + * faster. + * + * Chunks holding summaries are marked with tags making it look like + * they are part of a fake file. + * + * The summary could also be used during gc. + * + */ + +#include "yaffs_summary.h" +#include "yaffs_packedtags2.h" +#include "yaffs_nand.h" +#include "yaffs_getblockinfo.h" +#include "yaffs_bitmap.h" + +/* + * The summary is built up in an array of summary tags. + * This gets written to the last one or two (maybe more) chunks in a block. + * A summary header is written as the first part of each chunk of summary data. + * The summary header must match or the summary is rejected. + */ + +/* Summary tags don't need the sequence number because that is redundant. */ +struct yaffs_summary_tags { + unsigned obj_id; + unsigned chunk_id; + unsigned n_bytes; +}; + +/* Summary header */ +struct yaffs_summary_header { + unsigned version; /* Must match current version */ + unsigned block; /* Must be this block */ + unsigned seq; /* Must be this sequence number */ + unsigned sum; /* Just add up all the bytes in the tags */ +}; + + +static void yaffs_summary_clear(struct yaffs_dev *dev) +{ + if (!dev->sum_tags) + return; + memset(dev->sum_tags, 0, dev->chunks_per_summary * + sizeof(struct yaffs_summary_tags)); +} + + +void yaffs_summary_deinit(struct yaffs_dev *dev) +{ + kfree(dev->sum_tags); + dev->sum_tags = NULL; + kfree(dev->gc_sum_tags); + dev->gc_sum_tags = NULL; + dev->chunks_per_summary = 0; +} + +int yaffs_summary_init(struct yaffs_dev *dev) +{ + int sum_bytes; + int chunks_used; /* Number of chunks used by summary */ + int sum_tags_bytes; + + sum_bytes = dev->param.chunks_per_block * + sizeof(struct yaffs_summary_tags); + + chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/ + (dev->data_bytes_per_chunk - + sizeof(struct yaffs_summary_header)); + + dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used; + sum_tags_bytes = sizeof(struct yaffs_summary_tags) * + dev->chunks_per_summary; + dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS); + dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS); + if (!dev->sum_tags || !dev->gc_sum_tags) { + yaffs_summary_deinit(dev); + return YAFFS_FAIL; + } + + yaffs_summary_clear(dev); + + return YAFFS_OK; +} + +static unsigned yaffs_summary_sum(struct yaffs_dev *dev) +{ + u8 *sum_buffer = (u8 *)dev->sum_tags; + int i; + unsigned sum = 0; + + i = sizeof(struct yaffs_summary_tags) * + dev->chunks_per_summary; + while (i > 0) { + sum += *sum_buffer; + sum_buffer++; + i--; + } + + return sum; +} + +static int yaffs_summary_write(struct yaffs_dev *dev, int blk) +{ + struct yaffs_ext_tags tags; + u8 *buffer; + u8 *sum_buffer = (u8 *)dev->sum_tags; + int n_bytes; + int chunk_in_nand; + int chunk_in_block; + int result; + int this_tx; + struct yaffs_summary_header hdr; + int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); + struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); + + buffer = yaffs_get_temp_buffer(dev); + n_bytes = sizeof(struct yaffs_summary_tags) * + dev->chunks_per_summary; + memset(&tags, 0, sizeof(struct yaffs_ext_tags)); + tags.obj_id = YAFFS_OBJECTID_SUMMARY; + tags.chunk_id = 1; + chunk_in_block = dev->chunks_per_summary; + chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block + + dev->chunks_per_summary; + hdr.version = YAFFS_SUMMARY_VERSION; + hdr.block = blk; + hdr.seq = bi->seq_number; + hdr.sum = yaffs_summary_sum(dev); + + do { + this_tx = n_bytes; + if (this_tx > sum_bytes_per_chunk) + this_tx = sum_bytes_per_chunk; + memcpy(buffer, &hdr, sizeof(hdr)); + memcpy(buffer + sizeof(hdr), sum_buffer, this_tx); + tags.n_bytes = this_tx + sizeof(hdr); + result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand, + buffer, &tags); + + if (result != YAFFS_OK) + break; + yaffs_set_chunk_bit(dev, blk, chunk_in_block); + bi->pages_in_use++; + dev->n_free_chunks--; + + n_bytes -= this_tx; + sum_buffer += this_tx; + chunk_in_nand++; + chunk_in_block++; + tags.chunk_id++; + } while (result == YAFFS_OK && n_bytes > 0); + yaffs_release_temp_buffer(dev, buffer); + + + if (result == YAFFS_OK) + bi->has_summary = 1; + + + return result; +} + +int yaffs_summary_read(struct yaffs_dev *dev, + struct yaffs_summary_tags *st, + int blk) +{ + struct yaffs_ext_tags tags; + u8 *buffer; + u8 *sum_buffer = (u8 *)st; + int n_bytes; + int chunk_id; + int chunk_in_nand; + int chunk_in_block; + int result; + int this_tx; + struct yaffs_summary_header hdr; + struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); + int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); + int sum_tags_bytes; + + sum_tags_bytes = sizeof(struct yaffs_summary_tags) * + dev->chunks_per_summary; + buffer = yaffs_get_temp_buffer(dev); + n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary; + chunk_in_block = dev->chunks_per_summary; + chunk_in_nand = blk * dev->param.chunks_per_block + + dev->chunks_per_summary; + chunk_id = 1; + do { + this_tx = n_bytes; + if (this_tx > sum_bytes_per_chunk) + this_tx = sum_bytes_per_chunk; + result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand, + buffer, &tags); + + if (tags.chunk_id != chunk_id || + tags.obj_id != YAFFS_OBJECTID_SUMMARY || + tags.chunk_used == 0 || + tags.ecc_result > YAFFS_ECC_RESULT_FIXED || + tags.n_bytes != (this_tx + sizeof(hdr))) + result = YAFFS_FAIL; + if (result != YAFFS_OK) + break; + + if (st == dev->sum_tags) { + /* If we're scanning then update the block info */ + yaffs_set_chunk_bit(dev, blk, chunk_in_block); + bi->pages_in_use++; + } + memcpy(&hdr, buffer, sizeof(hdr)); + memcpy(sum_buffer, buffer + sizeof(hdr), this_tx); + n_bytes -= this_tx; + sum_buffer += this_tx; + chunk_in_nand++; + chunk_in_block++; + chunk_id++; + } while (result == YAFFS_OK && n_bytes > 0); + yaffs_release_temp_buffer(dev, buffer); + + if (result == YAFFS_OK) { + /* Verify header */ + if (hdr.version != YAFFS_SUMMARY_VERSION || + hdr.block != blk || + hdr.seq != bi->seq_number || + hdr.sum != yaffs_summary_sum(dev)) + result = YAFFS_FAIL; + } + + if (st == dev->sum_tags && result == YAFFS_OK) + bi->has_summary = 1; + + return result; +} + +int yaffs_summary_add(struct yaffs_dev *dev, + struct yaffs_ext_tags *tags, + int chunk_in_nand) +{ + struct yaffs_packed_tags2_tags_only tags_only; + struct yaffs_summary_tags *sum_tags; + int block_in_nand = chunk_in_nand / dev->param.chunks_per_block; + int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block; + + if (!dev->sum_tags) + return YAFFS_OK; + + if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) { + yaffs_pack_tags2_tags_only(&tags_only, tags); + sum_tags = &dev->sum_tags[chunk_in_block]; + sum_tags->chunk_id = tags_only.chunk_id; + sum_tags->n_bytes = tags_only.n_bytes; + sum_tags->obj_id = tags_only.obj_id; + + if (chunk_in_block == dev->chunks_per_summary - 1) { + /* Time to write out the summary */ + yaffs_summary_write(dev, block_in_nand); + yaffs_summary_clear(dev); + yaffs_skip_rest_of_block(dev); + } + } + return YAFFS_OK; +} + +int yaffs_summary_fetch(struct yaffs_dev *dev, + struct yaffs_ext_tags *tags, + int chunk_in_block) +{ + struct yaffs_packed_tags2_tags_only tags_only; + struct yaffs_summary_tags *sum_tags; + if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) { + sum_tags = &dev->sum_tags[chunk_in_block]; + tags_only.chunk_id = sum_tags->chunk_id; + tags_only.n_bytes = sum_tags->n_bytes; + tags_only.obj_id = sum_tags->obj_id; + yaffs_unpack_tags2_tags_only(tags, &tags_only); + return YAFFS_OK; + } + return YAFFS_FAIL; +} + +void yaffs_summary_gc(struct yaffs_dev *dev, int blk) +{ + struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); + int i; + + if (!bi->has_summary) + return; + + for (i = dev->chunks_per_summary; + i < dev->param.chunks_per_block; + i++) { + if (yaffs_check_chunk_bit(dev, blk, i)) { + yaffs_clear_chunk_bit(dev, blk, i); + bi->pages_in_use--; + dev->n_free_chunks++; + } + } +} diff --git a/fs/yaffs2/yaffs_summary.h b/fs/yaffs2/yaffs_summary.h new file mode 100644 index 000000000000..be141d073369 --- /dev/null +++ b/fs/yaffs2/yaffs_summary.h @@ -0,0 +1,37 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_SUMMARY_H__ +#define __YAFFS_SUMMARY_H__ + +#include "yaffs_packedtags2.h" + + +int yaffs_summary_init(struct yaffs_dev *dev); +void yaffs_summary_deinit(struct yaffs_dev *dev); + +int yaffs_summary_add(struct yaffs_dev *dev, + struct yaffs_ext_tags *tags, + int chunk_in_block); +int yaffs_summary_fetch(struct yaffs_dev *dev, + struct yaffs_ext_tags *tags, + int chunk_in_block); +int yaffs_summary_read(struct yaffs_dev *dev, + struct yaffs_summary_tags *st, + int blk); +void yaffs_summary_gc(struct yaffs_dev *dev, int blk); + + +#endif diff --git a/fs/yaffs2/yaffs_tagscompat.c b/fs/yaffs2/yaffs_tagscompat.c new file mode 100644 index 000000000000..092430beccb7 --- /dev/null +++ b/fs/yaffs2/yaffs_tagscompat.c @@ -0,0 +1,381 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_guts.h" +#include "yaffs_tagscompat.h" +#include "yaffs_ecc.h" +#include "yaffs_getblockinfo.h" +#include "yaffs_trace.h" + +static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk); + + +/********** Tags ECC calculations *********/ + + +void yaffs_calc_tags_ecc(struct yaffs_tags *tags) +{ + /* Calculate an ecc */ + unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes; + unsigned i, j; + unsigned ecc = 0; + unsigned bit = 0; + + tags->ecc = 0; + + for (i = 0; i < 8; i++) { + for (j = 1; j & 0xff; j <<= 1) { + bit++; + if (b[i] & j) + ecc ^= bit; + } + } + tags->ecc = ecc; +} + +int yaffs_check_tags_ecc(struct yaffs_tags *tags) +{ + unsigned ecc = tags->ecc; + + yaffs_calc_tags_ecc(tags); + + ecc ^= tags->ecc; + + if (ecc && ecc <= 64) { + /* TODO: Handle the failure better. Retire? */ + unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes; + + ecc--; + + b[ecc / 8] ^= (1 << (ecc & 7)); + + /* Now recvalc the ecc */ + yaffs_calc_tags_ecc(tags); + + return 1; /* recovered error */ + } else if (ecc) { + /* Wierd ecc failure value */ + /* TODO Need to do somethiong here */ + return -1; /* unrecovered error */ + } + return 0; +} + +/********** Tags **********/ + +static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr, + struct yaffs_tags *tags_ptr) +{ + union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr; + + yaffs_calc_tags_ecc(tags_ptr); + + spare_ptr->tb0 = tu->as_bytes[0]; + spare_ptr->tb1 = tu->as_bytes[1]; + spare_ptr->tb2 = tu->as_bytes[2]; + spare_ptr->tb3 = tu->as_bytes[3]; + spare_ptr->tb4 = tu->as_bytes[4]; + spare_ptr->tb5 = tu->as_bytes[5]; + spare_ptr->tb6 = tu->as_bytes[6]; + spare_ptr->tb7 = tu->as_bytes[7]; +} + +static void yaffs_get_tags_from_spare(struct yaffs_dev *dev, + struct yaffs_spare *spare_ptr, + struct yaffs_tags *tags_ptr) +{ + union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr; + int result; + + tu->as_bytes[0] = spare_ptr->tb0; + tu->as_bytes[1] = spare_ptr->tb1; + tu->as_bytes[2] = spare_ptr->tb2; + tu->as_bytes[3] = spare_ptr->tb3; + tu->as_bytes[4] = spare_ptr->tb4; + tu->as_bytes[5] = spare_ptr->tb5; + tu->as_bytes[6] = spare_ptr->tb6; + tu->as_bytes[7] = spare_ptr->tb7; + + result = yaffs_check_tags_ecc(tags_ptr); + if (result > 0) + dev->n_tags_ecc_fixed++; + else if (result < 0) + dev->n_tags_ecc_unfixed++; +} + +static void yaffs_spare_init(struct yaffs_spare *spare) +{ + memset(spare, 0xff, sizeof(struct yaffs_spare)); +} + +static int yaffs_wr_nand(struct yaffs_dev *dev, + int nand_chunk, const u8 *data, + struct yaffs_spare *spare) +{ + int data_size = dev->data_bytes_per_chunk; + + return dev->drv.drv_write_chunk_fn(dev, nand_chunk, + data, data_size, + (u8 *) spare, sizeof(*spare)); +} + +static int yaffs_rd_chunk_nand(struct yaffs_dev *dev, + int nand_chunk, + u8 *data, + struct yaffs_spare *spare, + enum yaffs_ecc_result *ecc_result, + int correct_errors) +{ + int ret_val; + struct yaffs_spare local_spare; + int data_size; + int spare_size; + int ecc_result1, ecc_result2; + u8 calc_ecc[3]; + + if (!spare) { + /* If we don't have a real spare, then we use a local one. */ + /* Need this for the calculation of the ecc */ + spare = &local_spare; + } + data_size = dev->data_bytes_per_chunk; + spare_size = sizeof(struct yaffs_spare); + + if (dev->param.use_nand_ecc) + return dev->drv.drv_read_chunk_fn(dev, nand_chunk, + data, data_size, + (u8 *) spare, spare_size, + ecc_result); + + + /* Handle the ECC at this level. */ + + ret_val = dev->drv.drv_read_chunk_fn(dev, nand_chunk, + data, data_size, + (u8 *)spare, spare_size, + NULL); + if (!data || !correct_errors) + return ret_val; + + /* Do ECC correction if needed. */ + yaffs_ecc_calc(data, calc_ecc); + ecc_result1 = yaffs_ecc_correct(data, spare->ecc1, calc_ecc); + yaffs_ecc_calc(&data[256], calc_ecc); + ecc_result2 = yaffs_ecc_correct(&data[256], spare->ecc2, calc_ecc); + + if (ecc_result1 > 0) { + yaffs_trace(YAFFS_TRACE_ERROR, + "**>>yaffs ecc error fix performed on chunk %d:0", + nand_chunk); + dev->n_ecc_fixed++; + } else if (ecc_result1 < 0) { + yaffs_trace(YAFFS_TRACE_ERROR, + "**>>yaffs ecc error unfixed on chunk %d:0", + nand_chunk); + dev->n_ecc_unfixed++; + } + + if (ecc_result2 > 0) { + yaffs_trace(YAFFS_TRACE_ERROR, + "**>>yaffs ecc error fix performed on chunk %d:1", + nand_chunk); + dev->n_ecc_fixed++; + } else if (ecc_result2 < 0) { + yaffs_trace(YAFFS_TRACE_ERROR, + "**>>yaffs ecc error unfixed on chunk %d:1", + nand_chunk); + dev->n_ecc_unfixed++; + } + + if (ecc_result1 || ecc_result2) { + /* We had a data problem on this page */ + yaffs_handle_rd_data_error(dev, nand_chunk); + } + + if (ecc_result1 < 0 || ecc_result2 < 0) + *ecc_result = YAFFS_ECC_RESULT_UNFIXED; + else if (ecc_result1 > 0 || ecc_result2 > 0) + *ecc_result = YAFFS_ECC_RESULT_FIXED; + else + *ecc_result = YAFFS_ECC_RESULT_NO_ERROR; + + return ret_val; +} + +/* + * Functions for robustisizing + */ + +static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk) +{ + int flash_block = nand_chunk / dev->param.chunks_per_block; + + /* Mark the block for retirement */ + yaffs_get_block_info(dev, flash_block + dev->block_offset)-> + needs_retiring = 1; + yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + "**>>Block %d marked for retirement", + flash_block); + + /* TODO: + * Just do a garbage collection on the affected block + * then retire the block + * NB recursion + */ +} + +static int yaffs_tags_compat_wr(struct yaffs_dev *dev, + int nand_chunk, + const u8 *data, const struct yaffs_ext_tags *ext_tags) +{ + struct yaffs_spare spare; + struct yaffs_tags tags; + + yaffs_spare_init(&spare); + + if (ext_tags->is_deleted) + spare.page_status = 0; + else { + tags.obj_id = ext_tags->obj_id; + tags.chunk_id = ext_tags->chunk_id; + + tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1); + + if (dev->data_bytes_per_chunk >= 1024) + tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3; + else + tags.n_bytes_msb = 3; + + tags.serial_number = ext_tags->serial_number; + + if (!dev->param.use_nand_ecc && data) { + yaffs_ecc_calc(data, spare.ecc1); + yaffs_ecc_calc(&data[256], spare.ecc2); + } + + yaffs_load_tags_to_spare(&spare, &tags); + } + return yaffs_wr_nand(dev, nand_chunk, data, &spare); +} + +static int yaffs_tags_compat_rd(struct yaffs_dev *dev, + int nand_chunk, + u8 *data, struct yaffs_ext_tags *ext_tags) +{ + struct yaffs_spare spare; + struct yaffs_tags tags; + enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN; + static struct yaffs_spare spare_ff; + static int init; + int deleted; + + if (!init) { + memset(&spare_ff, 0xff, sizeof(spare_ff)); + init = 1; + } + + if (!yaffs_rd_chunk_nand(dev, nand_chunk, + data, &spare, &ecc_result, 1)) + return YAFFS_FAIL; + + /* ext_tags may be NULL */ + if (!ext_tags) + return YAFFS_OK; + + deleted = (hweight8(spare.page_status) < 7) ? 1 : 0; + + ext_tags->is_deleted = deleted; + ext_tags->ecc_result = ecc_result; + ext_tags->block_bad = 0; /* We're reading it */ + /* therefore it is not a bad block */ + ext_tags->chunk_used = + memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0; + + if (ext_tags->chunk_used) { + yaffs_get_tags_from_spare(dev, &spare, &tags); + ext_tags->obj_id = tags.obj_id; + ext_tags->chunk_id = tags.chunk_id; + ext_tags->n_bytes = tags.n_bytes_lsb; + + if (dev->data_bytes_per_chunk >= 1024) + ext_tags->n_bytes |= + (((unsigned)tags.n_bytes_msb) << 10); + + ext_tags->serial_number = tags.serial_number; + } + + return YAFFS_OK; +} + +static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block) +{ + struct yaffs_spare spare; + + memset(&spare, 0xff, sizeof(struct yaffs_spare)); + + spare.block_status = 'Y'; + + yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL, + &spare); + yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1, + NULL, &spare); + + return YAFFS_OK; +} + +static int yaffs_tags_compat_query_block(struct yaffs_dev *dev, + int block_no, + enum yaffs_block_state *state, + u32 *seq_number) +{ + struct yaffs_spare spare0, spare1; + static struct yaffs_spare spare_ff; + static int init; + enum yaffs_ecc_result dummy; + + if (!init) { + memset(&spare_ff, 0xff, sizeof(spare_ff)); + init = 1; + } + + *seq_number = 0; + + /* Look for bad block markers in the first two chunks */ + yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, + NULL, &spare0, &dummy, 0); + yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1, + NULL, &spare1, &dummy, 0); + + if (hweight8(spare0.block_status & spare1.block_status) < 7) + *state = YAFFS_BLOCK_STATE_DEAD; + else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0) + *state = YAFFS_BLOCK_STATE_EMPTY; + else + *state = YAFFS_BLOCK_STATE_NEEDS_SCAN; + + return YAFFS_OK; +} + +void yaffs_tags_compat_install(struct yaffs_dev *dev) +{ + if(dev->param.is_yaffs2) + return; + if(!dev->tagger.write_chunk_tags_fn) + dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_wr; + if(!dev->tagger.read_chunk_tags_fn) + dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_rd; + if(!dev->tagger.query_block_fn) + dev->tagger.query_block_fn = yaffs_tags_compat_query_block; + if(!dev->tagger.mark_bad_fn) + dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad; +} diff --git a/fs/yaffs2/yaffs_tagscompat.h b/fs/yaffs2/yaffs_tagscompat.h new file mode 100644 index 000000000000..92d298a6f582 --- /dev/null +++ b/fs/yaffs2/yaffs_tagscompat.h @@ -0,0 +1,44 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_TAGSCOMPAT_H__ +#define __YAFFS_TAGSCOMPAT_H__ + + +#include "yaffs_guts.h" + +#if 0 + + +int yaffs_tags_compat_wr(struct yaffs_dev *dev, + int nand_chunk, + const u8 *data, const struct yaffs_ext_tags *tags); +int yaffs_tags_compat_rd(struct yaffs_dev *dev, + int nand_chunk, + u8 *data, struct yaffs_ext_tags *tags); +int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no); +int yaffs_tags_compat_query_block(struct yaffs_dev *dev, + int block_no, + enum yaffs_block_state *state, + u32 *seq_number); + +#endif + + +void yaffs_tags_compat_install(struct yaffs_dev *dev); +void yaffs_calc_tags_ecc(struct yaffs_tags *tags); +int yaffs_check_tags_ecc(struct yaffs_tags *tags); + +#endif diff --git a/fs/yaffs2/yaffs_tagsmarshall.c b/fs/yaffs2/yaffs_tagsmarshall.c new file mode 100644 index 000000000000..44a83b12ca4d --- /dev/null +++ b/fs/yaffs2/yaffs_tagsmarshall.c @@ -0,0 +1,199 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_guts.h" +#include "yaffs_trace.h" +#include "yaffs_packedtags2.h" + +static int yaffs_tags_marshall_write(struct yaffs_dev *dev, + int nand_chunk, const u8 *data, + const struct yaffs_ext_tags *tags) +{ + struct yaffs_packed_tags2 pt; + int retval; + + int packed_tags_size = + dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt); + void *packed_tags_ptr = + dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt; + + yaffs_trace(YAFFS_TRACE_MTD, + "yaffs_tags_marshall_write chunk %d data %p tags %p", + nand_chunk, data, tags); + + /* For yaffs2 writing there must be both data and tags. + * If we're using inband tags, then the tags are stuffed into + * the end of the data buffer. + */ + if (!data || !tags) + BUG(); + else if (dev->param.inband_tags) { + struct yaffs_packed_tags2_tags_only *pt2tp; + pt2tp = + (struct yaffs_packed_tags2_tags_only *)(data + + dev-> + data_bytes_per_chunk); + yaffs_pack_tags2_tags_only(pt2tp, tags); + } else { + yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc); + } + + retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk, + data, dev->param.total_bytes_per_chunk, + (dev->param.inband_tags) ? NULL : packed_tags_ptr, + (dev->param.inband_tags) ? 0 : packed_tags_size); + + return retval; +} + +static int yaffs_tags_marshall_read(struct yaffs_dev *dev, + int nand_chunk, u8 *data, + struct yaffs_ext_tags *tags) +{ + int retval = 0; + int local_data = 0; + u8 spare_buffer[100]; + enum yaffs_ecc_result ecc_result; + + struct yaffs_packed_tags2 pt; + + int packed_tags_size = + dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt); + void *packed_tags_ptr = + dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt; + + yaffs_trace(YAFFS_TRACE_MTD, + "yaffs_tags_marshall_read chunk %d data %p tags %p", + nand_chunk, data, tags); + + if (dev->param.inband_tags) { + if (!data) { + local_data = 1; + data = yaffs_get_temp_buffer(dev); + } + } + + if (dev->param.inband_tags || (data && !tags)) + retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk, + data, dev->param.total_bytes_per_chunk, + NULL, 0, + &ecc_result); + else if (tags) + retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk, + data, dev->param.total_bytes_per_chunk, + spare_buffer, packed_tags_size, + &ecc_result); + else + BUG(); + + + if (dev->param.inband_tags) { + if (tags) { + struct yaffs_packed_tags2_tags_only *pt2tp; + pt2tp = + (struct yaffs_packed_tags2_tags_only *) + &data[dev->data_bytes_per_chunk]; + yaffs_unpack_tags2_tags_only(tags, pt2tp); + } + } else if (tags) { + memcpy(packed_tags_ptr, spare_buffer, packed_tags_size); + yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc); + } + + if (local_data) + yaffs_release_temp_buffer(dev, data); + + if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) { + tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED; + dev->n_ecc_unfixed++; + } + + if (tags && ecc_result == -YAFFS_ECC_RESULT_FIXED) { + if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR) + tags->ecc_result = YAFFS_ECC_RESULT_FIXED; + dev->n_ecc_fixed++; + } + + if (ecc_result < YAFFS_ECC_RESULT_UNFIXED) + return YAFFS_OK; + else + return YAFFS_FAIL; +} + +static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no, + enum yaffs_block_state *state, + u32 *seq_number) +{ + int retval; + + yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d", + block_no); + + retval = dev->drv.drv_check_bad_fn(dev, block_no); + + if (retval== YAFFS_FAIL) { + yaffs_trace(YAFFS_TRACE_MTD, "block is bad"); + + *state = YAFFS_BLOCK_STATE_DEAD; + *seq_number = 0; + } else { + struct yaffs_ext_tags t; + + yaffs_tags_marshall_read(dev, + block_no * dev->param.chunks_per_block, + NULL, &t); + + if (t.chunk_used) { + *seq_number = t.seq_number; + *state = YAFFS_BLOCK_STATE_NEEDS_SCAN; + } else { + *seq_number = 0; + *state = YAFFS_BLOCK_STATE_EMPTY; + } + } + + yaffs_trace(YAFFS_TRACE_MTD, + "block query returns seq %d state %d", + *seq_number, *state); + + if (retval == 0) + return YAFFS_OK; + else + return YAFFS_FAIL; +} + +static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no) +{ + return dev->drv.drv_mark_bad_fn(dev, block_no); + +} + + +void yaffs_tags_marshall_install(struct yaffs_dev *dev) +{ + if (!dev->param.is_yaffs2) + return; + + if (!dev->tagger.write_chunk_tags_fn) + dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write; + + if (!dev->tagger.read_chunk_tags_fn) + dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read; + + if (!dev->tagger.query_block_fn) + dev->tagger.query_block_fn = yaffs_tags_marshall_query_block; + + if (!dev->tagger.mark_bad_fn) + dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad; + +} diff --git a/fs/yaffs2/yaffs_tagsmarshall.h b/fs/yaffs2/yaffs_tagsmarshall.h new file mode 100644 index 000000000000..bf3e68a1a5be --- /dev/null +++ b/fs/yaffs2/yaffs_tagsmarshall.h @@ -0,0 +1,22 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_TAGSMARSHALL_H__ +#define __YAFFS_TAGSMARSHALL_H__ + +#include "yaffs_guts.h" +void yaffs_tags_marshall_install(struct yaffs_dev *dev); + +#endif diff --git a/fs/yaffs2/yaffs_trace.h b/fs/yaffs2/yaffs_trace.h new file mode 100644 index 000000000000..fd26054d3912 --- /dev/null +++ b/fs/yaffs2/yaffs_trace.h @@ -0,0 +1,57 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YTRACE_H__ +#define __YTRACE_H__ + +extern unsigned int yaffs_trace_mask; +extern unsigned int yaffs_wr_attempts; + +/* + * Tracing flags. + * The flags masked in YAFFS_TRACE_ALWAYS are always traced. + */ + +#define YAFFS_TRACE_OS 0x00000002 +#define YAFFS_TRACE_ALLOCATE 0x00000004 +#define YAFFS_TRACE_SCAN 0x00000008 +#define YAFFS_TRACE_BAD_BLOCKS 0x00000010 +#define YAFFS_TRACE_ERASE 0x00000020 +#define YAFFS_TRACE_GC 0x00000040 +#define YAFFS_TRACE_WRITE 0x00000080 +#define YAFFS_TRACE_TRACING 0x00000100 +#define YAFFS_TRACE_DELETION 0x00000200 +#define YAFFS_TRACE_BUFFERS 0x00000400 +#define YAFFS_TRACE_NANDACCESS 0x00000800 +#define YAFFS_TRACE_GC_DETAIL 0x00001000 +#define YAFFS_TRACE_SCAN_DEBUG 0x00002000 +#define YAFFS_TRACE_MTD 0x00004000 +#define YAFFS_TRACE_CHECKPOINT 0x00008000 + +#define YAFFS_TRACE_VERIFY 0x00010000 +#define YAFFS_TRACE_VERIFY_NAND 0x00020000 +#define YAFFS_TRACE_VERIFY_FULL 0x00040000 +#define YAFFS_TRACE_VERIFY_ALL 0x000f0000 + +#define YAFFS_TRACE_SYNC 0x00100000 +#define YAFFS_TRACE_BACKGROUND 0x00200000 +#define YAFFS_TRACE_LOCK 0x00400000 +#define YAFFS_TRACE_MOUNT 0x00800000 + +#define YAFFS_TRACE_ERROR 0x40000000 +#define YAFFS_TRACE_BUG 0x80000000 +#define YAFFS_TRACE_ALWAYS 0xf0000000 + +#endif diff --git a/fs/yaffs2/yaffs_verify.c b/fs/yaffs2/yaffs_verify.c new file mode 100644 index 000000000000..e8f2f0a6c2be --- /dev/null +++ b/fs/yaffs2/yaffs_verify.c @@ -0,0 +1,529 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_verify.h" +#include "yaffs_trace.h" +#include "yaffs_bitmap.h" +#include "yaffs_getblockinfo.h" +#include "yaffs_nand.h" + +int yaffs_skip_verification(struct yaffs_dev *dev) +{ + (void) dev; + return !(yaffs_trace_mask & + (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL)); +} + +static int yaffs_skip_full_verification(struct yaffs_dev *dev) +{ + (void) dev; + return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL)); +} + +static int yaffs_skip_nand_verification(struct yaffs_dev *dev) +{ + (void) dev; + return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND)); +} + +static const char * const block_state_name[] = { + "Unknown", + "Needs scan", + "Scanning", + "Empty", + "Allocating", + "Full", + "Dirty", + "Checkpoint", + "Collecting", + "Dead" +}; + +void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n) +{ + int actually_used; + int in_use; + + if (yaffs_skip_verification(dev)) + return; + + /* Report illegal runtime states */ + if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Block %d has undefined state %d", + n, bi->block_state); + + switch (bi->block_state) { + case YAFFS_BLOCK_STATE_UNKNOWN: + case YAFFS_BLOCK_STATE_SCANNING: + case YAFFS_BLOCK_STATE_NEEDS_SCAN: + yaffs_trace(YAFFS_TRACE_VERIFY, + "Block %d has bad run-state %s", + n, block_state_name[bi->block_state]); + } + + /* Check pages in use and soft deletions are legal */ + + actually_used = bi->pages_in_use - bi->soft_del_pages; + + if (bi->pages_in_use < 0 || + bi->pages_in_use > dev->param.chunks_per_block || + bi->soft_del_pages < 0 || + bi->soft_del_pages > dev->param.chunks_per_block || + actually_used < 0 || actually_used > dev->param.chunks_per_block) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Block %d has illegal values pages_in_used %d soft_del_pages %d", + n, bi->pages_in_use, bi->soft_del_pages); + + /* Check chunk bitmap legal */ + in_use = yaffs_count_chunk_bits(dev, n); + if (in_use != bi->pages_in_use) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Block %d has inconsistent values pages_in_use %d counted chunk bits %d", + n, bi->pages_in_use, in_use); +} + +void yaffs_verify_collected_blk(struct yaffs_dev *dev, + struct yaffs_block_info *bi, int n) +{ + yaffs_verify_blk(dev, bi, n); + + /* After collection the block should be in the erased state */ + + if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING && + bi->block_state != YAFFS_BLOCK_STATE_EMPTY) { + yaffs_trace(YAFFS_TRACE_ERROR, + "Block %d is in state %d after gc, should be erased", + n, bi->block_state); + } +} + +void yaffs_verify_blocks(struct yaffs_dev *dev) +{ + int i; + int state_count[YAFFS_NUMBER_OF_BLOCK_STATES]; + int illegal_states = 0; + + if (yaffs_skip_verification(dev)) + return; + + memset(state_count, 0, sizeof(state_count)); + + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + struct yaffs_block_info *bi = yaffs_get_block_info(dev, i); + yaffs_verify_blk(dev, bi, i); + + if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES) + state_count[bi->block_state]++; + else + illegal_states++; + } + + yaffs_trace(YAFFS_TRACE_VERIFY, "Block summary"); + + yaffs_trace(YAFFS_TRACE_VERIFY, + "%d blocks have illegal states", + illegal_states); + if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Too many allocating blocks"); + + for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++) + yaffs_trace(YAFFS_TRACE_VERIFY, + "%s %d blocks", + block_state_name[i], state_count[i]); + + if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT]) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Checkpoint block count wrong dev %d count %d", + dev->blocks_in_checkpt, + state_count[YAFFS_BLOCK_STATE_CHECKPOINT]); + + if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY]) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Erased block count wrong dev %d count %d", + dev->n_erased_blocks, + state_count[YAFFS_BLOCK_STATE_EMPTY]); + + if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Too many collecting blocks %d (max is 1)", + state_count[YAFFS_BLOCK_STATE_COLLECTING]); +} + +/* + * Verify the object header. oh must be valid, but obj and tags may be NULL in + * which case those tests will not be performed. + */ +void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh, + struct yaffs_ext_tags *tags, int parent_check) +{ + if (obj && yaffs_skip_verification(obj->my_dev)) + return; + + if (!(tags && obj && oh)) { + yaffs_trace(YAFFS_TRACE_VERIFY, + "Verifying object header tags %p obj %p oh %p", + tags, obj, oh); + return; + } + + if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN || + oh->type > YAFFS_OBJECT_TYPE_MAX) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d header type is illegal value 0x%x", + tags->obj_id, oh->type); + + if (tags->obj_id != obj->obj_id) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d header mismatch obj_id %d", + tags->obj_id, obj->obj_id); + + /* + * Check that the object's parent ids match if parent_check requested. + * + * Tests do not apply to the root object. + */ + + if (parent_check && tags->obj_id > 1 && !obj->parent) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d header mismatch parent_id %d obj->parent is NULL", + tags->obj_id, oh->parent_obj_id); + + if (parent_check && obj->parent && + oh->parent_obj_id != obj->parent->obj_id && + (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED || + obj->parent->obj_id != YAFFS_OBJECTID_DELETED)) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d header mismatch parent_id %d parent_obj_id %d", + tags->obj_id, oh->parent_obj_id, + obj->parent->obj_id); + + if (tags->obj_id > 1 && oh->name[0] == 0) /* Null name */ + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d header name is NULL", + obj->obj_id); + + if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff) /* Junk name */ + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d header name is 0xff", + obj->obj_id); +} + +void yaffs_verify_file(struct yaffs_obj *obj) +{ + u32 x; + int required_depth; + int actual_depth; + int last_chunk; + u32 offset_in_chunk; + u32 the_chunk; + + u32 i; + struct yaffs_dev *dev; + struct yaffs_ext_tags tags; + struct yaffs_tnode *tn; + u32 obj_id; + + if (!obj) + return; + + if (yaffs_skip_verification(obj->my_dev)) + return; + + dev = obj->my_dev; + obj_id = obj->obj_id; + + + /* Check file size is consistent with tnode depth */ + yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size, + &last_chunk, &offset_in_chunk); + last_chunk++; + x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS; + required_depth = 0; + while (x > 0) { + x >>= YAFFS_TNODES_INTERNAL_BITS; + required_depth++; + } + + actual_depth = obj->variant.file_variant.top_level; + + /* Check that the chunks in the tnode tree are all correct. + * We do this by scanning through the tnode tree and + * checking the tags for every chunk match. + */ + + if (yaffs_skip_nand_verification(dev)) + return; + + for (i = 1; i <= last_chunk; i++) { + tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i); + + if (!tn) + continue; + + the_chunk = yaffs_get_group_base(dev, tn, i); + if (the_chunk > 0) { + yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL, + &tags); + if (tags.obj_id != obj_id || tags.chunk_id != i) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)", + obj_id, i, the_chunk, + tags.obj_id, tags.chunk_id); + } + } +} + +void yaffs_verify_link(struct yaffs_obj *obj) +{ + if (obj && yaffs_skip_verification(obj->my_dev)) + return; + + /* Verify sane equivalent object */ +} + +void yaffs_verify_symlink(struct yaffs_obj *obj) +{ + if (obj && yaffs_skip_verification(obj->my_dev)) + return; + + /* Verify symlink string */ +} + +void yaffs_verify_special(struct yaffs_obj *obj) +{ + if (obj && yaffs_skip_verification(obj->my_dev)) + return; +} + +void yaffs_verify_obj(struct yaffs_obj *obj) +{ + struct yaffs_dev *dev; + u32 chunk_min; + u32 chunk_max; + u32 chunk_id_ok; + u32 chunk_in_range; + u32 chunk_wrongly_deleted; + u32 chunk_valid; + + if (!obj) + return; + + if (obj->being_created) + return; + + dev = obj->my_dev; + + if (yaffs_skip_verification(dev)) + return; + + /* Check sane object header chunk */ + + chunk_min = dev->internal_start_block * dev->param.chunks_per_block; + chunk_max = + (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1; + + chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min && + ((unsigned)(obj->hdr_chunk)) <= chunk_max); + chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0); + chunk_valid = chunk_in_range && + yaffs_check_chunk_bit(dev, + obj->hdr_chunk / dev->param.chunks_per_block, + obj->hdr_chunk % dev->param.chunks_per_block); + chunk_wrongly_deleted = chunk_in_range && !chunk_valid; + + if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted)) + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d has chunk_id %d %s %s", + obj->obj_id, obj->hdr_chunk, + chunk_id_ok ? "" : ",out of range", + chunk_wrongly_deleted ? ",marked as deleted" : ""); + + if (chunk_valid && !yaffs_skip_nand_verification(dev)) { + struct yaffs_ext_tags tags; + struct yaffs_obj_hdr *oh; + u8 *buffer = yaffs_get_temp_buffer(dev); + + oh = (struct yaffs_obj_hdr *)buffer; + + yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags); + + yaffs_verify_oh(obj, oh, &tags, 1); + + yaffs_release_temp_buffer(dev, buffer); + } + + /* Verify it has a parent */ + if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) { + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d has parent pointer %p which does not look like an object", + obj->obj_id, obj->parent); + } + + /* Verify parent is a directory */ + if (obj->parent && + obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d's parent is not a directory (type %d)", + obj->obj_id, obj->parent->variant_type); + } + + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + yaffs_verify_file(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + yaffs_verify_symlink(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + yaffs_verify_dir(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + yaffs_verify_link(obj); + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + yaffs_verify_special(obj); + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + yaffs_trace(YAFFS_TRACE_VERIFY, + "Obj %d has illegaltype %d", + obj->obj_id, obj->variant_type); + break; + } +} + +void yaffs_verify_objects(struct yaffs_dev *dev) +{ + struct yaffs_obj *obj; + int i; + struct list_head *lh; + + if (yaffs_skip_verification(dev)) + return; + + /* Iterate through the objects in each hash entry */ + + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + list_for_each(lh, &dev->obj_bucket[i].list) { + obj = list_entry(lh, struct yaffs_obj, hash_link); + yaffs_verify_obj(obj); + } + } +} + +void yaffs_verify_obj_in_dir(struct yaffs_obj *obj) +{ + struct list_head *lh; + struct yaffs_obj *list_obj; + int count = 0; + + if (!obj) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify"); + BUG(); + return; + } + + if (yaffs_skip_verification(obj->my_dev)) + return; + + if (!obj->parent) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent"); + BUG(); + return; + } + + if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory"); + BUG(); + } + + /* Iterate through the objects in each hash entry */ + + list_for_each(lh, &obj->parent->variant.dir_variant.children) { + list_obj = list_entry(lh, struct yaffs_obj, siblings); + yaffs_verify_obj(list_obj); + if (obj == list_obj) + count++; + } + + if (count != 1) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "Object in directory %d times", + count); + BUG(); + } +} + +void yaffs_verify_dir(struct yaffs_obj *directory) +{ + struct list_head *lh; + struct yaffs_obj *list_obj; + + if (!directory) { + BUG(); + return; + } + + if (yaffs_skip_full_verification(directory->my_dev)) + return; + + if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "Directory has wrong type: %d", + directory->variant_type); + BUG(); + } + + /* Iterate through the objects in each hash entry */ + + list_for_each(lh, &directory->variant.dir_variant.children) { + list_obj = list_entry(lh, struct yaffs_obj, siblings); + if (list_obj->parent != directory) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "Object in directory list has wrong parent %p", + list_obj->parent); + BUG(); + } + yaffs_verify_obj_in_dir(list_obj); + } +} + +static int yaffs_free_verification_failures; + +void yaffs_verify_free_chunks(struct yaffs_dev *dev) +{ + int counted; + int difference; + + if (yaffs_skip_verification(dev)) + return; + + counted = yaffs_count_free_chunks(dev); + + difference = dev->n_free_chunks - counted; + + if (difference) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "Freechunks verification failure %d %d %d", + dev->n_free_chunks, counted, difference); + yaffs_free_verification_failures++; + } +} + +int yaffs_verify_file_sane(struct yaffs_obj *in) +{ + (void) in; + return YAFFS_OK; +} diff --git a/fs/yaffs2/yaffs_verify.h b/fs/yaffs2/yaffs_verify.h new file mode 100644 index 000000000000..4f4af8d29aa4 --- /dev/null +++ b/fs/yaffs2/yaffs_verify.h @@ -0,0 +1,43 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_VERIFY_H__ +#define __YAFFS_VERIFY_H__ + +#include "yaffs_guts.h" + +void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, + int n); +void yaffs_verify_collected_blk(struct yaffs_dev *dev, + struct yaffs_block_info *bi, int n); +void yaffs_verify_blocks(struct yaffs_dev *dev); + +void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh, + struct yaffs_ext_tags *tags, int parent_check); +void yaffs_verify_file(struct yaffs_obj *obj); +void yaffs_verify_link(struct yaffs_obj *obj); +void yaffs_verify_symlink(struct yaffs_obj *obj); +void yaffs_verify_special(struct yaffs_obj *obj); +void yaffs_verify_obj(struct yaffs_obj *obj); +void yaffs_verify_objects(struct yaffs_dev *dev); +void yaffs_verify_obj_in_dir(struct yaffs_obj *obj); +void yaffs_verify_dir(struct yaffs_obj *directory); +void yaffs_verify_free_chunks(struct yaffs_dev *dev); + +int yaffs_verify_file_sane(struct yaffs_obj *obj); + +int yaffs_skip_verification(struct yaffs_dev *dev); + +#endif diff --git a/fs/yaffs2/yaffs_vfs.c b/fs/yaffs2/yaffs_vfs.c new file mode 100644 index 000000000000..b029b8d4276e --- /dev/null +++ b/fs/yaffs2/yaffs_vfs.c @@ -0,0 +1,3674 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * Acknowledgements: + * Luc van OostenRyck for numerous patches. + * Nick Bane for numerous patches. + * Nick Bane for 2.5/2.6 integration. + * Andras Toth for mknod rdev issue. + * Michael Fischer for finding the problem with inode inconsistency. + * Some code bodily lifted from JFFS + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * + * This is the file system front-end to YAFFS that hooks it up to + * the VFS. + * + * Special notes: + * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with + * this superblock + * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this + * superblock + * >> inode->u.generic_ip points to the associated struct yaffs_obj. + */ + +/* + * There are two variants of the VFS glue code. This variant should compile + * for any version of Linux. + */ +#include <linux/version.h> + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10)) +#define YAFFS_COMPILE_BACKGROUND +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)) +#define YAFFS_COMPILE_FREEZER +#endif +#endif + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)) +#define YAFFS_COMPILE_EXPORTFS +#endif + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35)) +#define YAFFS_USE_SETATTR_COPY +#define YAFFS_USE_TRUNCATE_SETSIZE +#endif +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35)) +#define YAFFS_HAS_EVICT_INODE +#endif + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13)) +#define YAFFS_NEW_FOLLOW_LINK 1 +#else +#define YAFFS_NEW_FOLLOW_LINK 0 +#endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0)) +#define YAFFS_HAS_WRITE_SUPER +#endif + + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)) +#include <linux/config.h> +#endif + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/proc_fs.h> +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39)) +#include <linux/smp_lock.h> +#endif +#include <linux/pagemap.h> +#include <linux/mtd/mtd.h> +#include <linux/interrupt.h> +#include <linux/string.h> +#include <linux/ctype.h> + +#if (YAFFS_NEW_FOLLOW_LINK == 1) +#include <linux/namei.h> +#endif + +#ifdef YAFFS_COMPILE_EXPORTFS +#include <linux/exportfs.h> +#endif + +#ifdef YAFFS_COMPILE_BACKGROUND +#include <linux/kthread.h> +#include <linux/delay.h> +#endif +#ifdef YAFFS_COMPILE_FREEZER +#include <linux/freezer.h> +#endif + +#include <asm/div64.h> + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) + +#include <linux/statfs.h> + +#define UnlockPage(p) unlock_page(p) +#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags) + +/* FIXME: use sb->s_id instead ? */ +#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) + +#else + +#include <linux/locks.h> +#define BDEVNAME_SIZE 0 +#define yaffs_devname(sb, buf) kdevname(sb->s_dev) + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)) +/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */ +#define __user +#endif + +#endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)) +#define YPROC_ROOT (&proc_root) +#else +#define YPROC_ROOT NULL +#endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)) +#define Y_INIT_TIMER(a) init_timer(a) +#else +#define Y_INIT_TIMER(a) timer_setup_on_stack(a, NULL, 0) +#endif + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27)) +#define YAFFS_USE_WRITE_BEGIN_END 1 +#else +#define YAFFS_USE_WRITE_BEGIN_END 0 +#endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0)) +#define YAFFS_SUPER_HAS_DIRTY +#endif + + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)) +#define set_nlink(inode, count) do { (inode)->i_nlink = (count); } while(0) +#endif + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)) +static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size) +{ + uint64_t result = partition_size; + do_div(result, block_size); + return (uint32_t) result; +} +#else +#define YCALCBLOCKS(s, b) ((s)/(b)) +#endif + +#include <linux/uaccess.h> +#include <linux/mtd/mtd.h> +#include <linux/cred.h> + +#include "yportenv.h" +#include "yaffs_trace.h" +#include "yaffs_guts.h" +#include "yaffs_attribs.h" + +#include "yaffs_linux.h" + +#include "yaffs_mtdif.h" +#include "yaffs_packedtags2.h" +#include "yaffs_getblockinfo.h" + +unsigned int yaffs_trace_mask = + YAFFS_TRACE_BAD_BLOCKS | + YAFFS_TRACE_ALWAYS | + 0; + +unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS; +unsigned int yaffs_auto_checkpoint = 1; +unsigned int yaffs_gc_control = 1; +unsigned int yaffs_bg_enable = 1; +unsigned int yaffs_auto_select = 1; +/* Module Parameters */ +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +module_param(yaffs_trace_mask, uint, 0644); +module_param(yaffs_wr_attempts, uint, 0644); +module_param(yaffs_auto_checkpoint, uint, 0644); +module_param(yaffs_gc_control, uint, 0644); +module_param(yaffs_bg_enable, uint, 0644); +#else +MODULE_PARM(yaffs_trace_mask, "i"); +MODULE_PARM(yaffs_wr_attempts, "i"); +MODULE_PARM(yaffs_auto_checkpoint, "i"); +MODULE_PARM(yaffs_gc_control, "i"); +#endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)) +/* use iget and read_inode */ +#define Y_IGET(sb, inum) iget((sb), (inum)) + +#else +/* Call local equivalent */ +#define YAFFS_USE_OWN_IGET +#define Y_IGET(sb, inum) yaffs_iget((sb), (inum)) + +#endif + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)) +#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private) +#else +#define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip) +#endif + +#define yaffs_inode_to_obj(iptr) \ + ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr))) +#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode) + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info) +#else +#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->u.generic_sbp) +#endif + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) +#define Y_CLEAR_INODE(i) clear_inode(i) +#else +#define Y_CLEAR_INODE(i) end_writeback(i) +#endif + + +#define update_dir_time(dir) do {\ + (dir)->i_ctime = (dir)->i_mtime = current_time(dir); \ + } while (0) + +static void yaffs_fill_inode_from_obj(struct inode *inode, + struct yaffs_obj *obj); + + +static void yaffs_gross_lock(struct yaffs_dev *dev) +{ + yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current); + mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock)); + yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current); +} + +static void yaffs_gross_unlock(struct yaffs_dev *dev) +{ + yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current); + mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock)); +} + + +static int yaffs_readpage_nolock(struct file *f, struct page *pg) +{ + /* Lifted from jffs2 */ + + struct yaffs_obj *obj; + unsigned char *pg_buf; + int ret; + loff_t pos = ((loff_t) pg->index) << PAGE_SHIFT; + struct yaffs_dev *dev; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readpage_nolock at %lld, size %08x", + (long long)pos, + (unsigned)PAGE_SIZE); + + obj = yaffs_dentry_to_obj(f->f_path.dentry); + + dev = obj->my_dev; + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) + BUG_ON(!PageLocked(pg)); +#else + if (!PageLocked(pg)) + PAGE_BUG(pg); +#endif + + pg_buf = kmap(pg); + /* FIXME: Can kmap fail? */ + + yaffs_gross_lock(dev); + + ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_SIZE); + + yaffs_gross_unlock(dev); + + if (ret >= 0) + ret = 0; + + if (ret) { + ClearPageUptodate(pg); + SetPageError(pg); + } else { + SetPageUptodate(pg); + ClearPageError(pg); + } + + flush_dcache_page(pg); + kunmap(pg); + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done"); + return ret; +} + +static int yaffs_readpage_unlock(struct file *f, struct page *pg) +{ + int ret = yaffs_readpage_nolock(f, pg); + UnlockPage(pg); + return ret; +} + +static int yaffs_readpage(struct file *f, struct page *pg) +{ + int ret; + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage"); + ret = yaffs_readpage_unlock(f, pg); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done"); + return ret; +} + + +static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val) +{ + struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev); + + if (lc) + lc->dirty = val; + +# ifdef YAFFS_SUPER_HAS_DIRTY + { + struct super_block *sb = lc->super; + + if (sb) + sb->s_dirt = val; + } +#endif + +} + +static void yaffs_set_super_dirty(struct yaffs_dev *dev) +{ + yaffs_set_super_dirty_val(dev, 1); +} + +static void yaffs_clear_super_dirty(struct yaffs_dev *dev) +{ + yaffs_set_super_dirty_val(dev, 0); +} + +static int yaffs_check_super_dirty(struct yaffs_dev *dev) +{ + struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev); + + if (lc && lc->dirty) + return 1; + +# ifdef YAFFS_SUPER_HAS_DIRTY + { + struct super_block *sb = lc->super; + + if (sb && sb->s_dirt) + return 1; + } +#endif + return 0; + +} + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +static int yaffs_writepage(struct page *page, struct writeback_control *wbc) +#else +static int yaffs_writepage(struct page *page) +#endif +{ + struct yaffs_dev *dev; + struct address_space *mapping = page->mapping; + struct inode *inode; + unsigned long end_index; + char *buffer; + struct yaffs_obj *obj; + int n_written = 0; + unsigned n_bytes; + loff_t i_size; + + if (!mapping) + BUG(); + inode = mapping->host; + if (!inode) + BUG(); + i_size = i_size_read(inode); + + end_index = i_size >> PAGE_SHIFT; + + if (page->index < end_index) + n_bytes = PAGE_SIZE; + else { + n_bytes = i_size & (PAGE_SIZE - 1); + + if (page->index > end_index || !n_bytes) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_writepage at %lld, inode size = %lld!!", + ((loff_t)page->index) << PAGE_SHIFT, + inode->i_size); + yaffs_trace(YAFFS_TRACE_OS, + " -> don't care!!"); + + zero_user_segment(page, 0, PAGE_SIZE); + set_page_writeback(page); + unlock_page(page); + end_page_writeback(page); + return 0; + } + } + + if (n_bytes != PAGE_SIZE) + zero_user_segment(page, n_bytes, PAGE_SIZE); + + get_page(page); + + buffer = kmap(page); + + obj = yaffs_inode_to_obj(inode); + dev = obj->my_dev; + yaffs_gross_lock(dev); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_writepage at %lld, size %08x", + ((loff_t)page->index) << PAGE_SHIFT, n_bytes); + yaffs_trace(YAFFS_TRACE_OS, + "writepag0: obj = %lld, ino = %lld", + obj->variant.file_variant.file_size, inode->i_size); + + n_written = yaffs_wr_file(obj, buffer, + ((loff_t)page->index) << PAGE_SHIFT, n_bytes, 0); + + yaffs_set_super_dirty(dev); + + yaffs_trace(YAFFS_TRACE_OS, + "writepag1: obj = %lld, ino = %lld", + obj->variant.file_variant.file_size, inode->i_size); + + yaffs_gross_unlock(dev); + + kunmap(page); + set_page_writeback(page); + unlock_page(page); + end_page_writeback(page); + put_page(page); + + return (n_written == n_bytes) ? 0 : -ENOSPC; +} + +/* Space holding and freeing is done to ensure we have space available for write_begin/end */ +/* For now we just assume few parallel writes and check against a small number. */ +/* Todo: need to do this with a counter to handle parallel reads better */ + +static ssize_t yaffs_hold_space(struct file *f) +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; + + int n_free_chunks; + + obj = yaffs_dentry_to_obj(f->f_path.dentry); + + dev = obj->my_dev; + + yaffs_gross_lock(dev); + + n_free_chunks = yaffs_get_n_free_chunks(dev); + + yaffs_gross_unlock(dev); + + return (n_free_chunks > 20) ? 1 : 0; +} + +static void yaffs_release_space(struct file *f) +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; + + obj = yaffs_dentry_to_obj(f->f_path.dentry); + + dev = obj->my_dev; + + yaffs_gross_lock(dev); + + yaffs_gross_unlock(dev); +} + +#if (YAFFS_USE_WRITE_BEGIN_END > 0) +static int yaffs_write_begin(struct file *filp, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + struct page *pg = NULL; + pgoff_t index = pos >> PAGE_SHIFT; + + int ret = 0; + int space_held = 0; + + /* Get a page */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28) + pg = grab_cache_page_write_begin(mapping, index, flags); +#else + pg = __grab_cache_page(mapping, index); +#endif + + *pagep = pg; + if (!pg) { + ret = -ENOMEM; + goto out; + } + yaffs_trace(YAFFS_TRACE_OS, + "start yaffs_write_begin index %d(%x) uptodate %d", + (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0); + + /* Get fs space */ + space_held = yaffs_hold_space(filp); + + if (!space_held) { + ret = -ENOSPC; + goto out; + } + + /* Update page if required */ + + if (!Page_Uptodate(pg)) + ret = yaffs_readpage_nolock(filp, pg); + + if (ret) + goto out; + + /* Happy path return */ + yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok"); + + return 0; + +out: + yaffs_trace(YAFFS_TRACE_OS, + "end yaffs_write_begin fail returning %d", ret); + if (space_held) + yaffs_release_space(filp); + if (pg) { + unlock_page(pg); + put_page(pg); + } + return ret; +} + +#else + +static int yaffs_prepare_write(struct file *f, struct page *pg, + unsigned offset, unsigned to) +{ + yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write"); + + if (!Page_Uptodate(pg)) + return yaffs_readpage_nolock(f, pg); + return 0; +} +#endif + + +static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, + loff_t * pos) +{ + struct yaffs_obj *obj; + int n_written; + loff_t ipos; + struct inode *inode; + struct yaffs_dev *dev; + + obj = yaffs_dentry_to_obj(f->f_path.dentry); + + if (!obj) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_file_write: hey obj is null!"); + return -EINVAL; + } + + dev = obj->my_dev; + + yaffs_gross_lock(dev); + + inode = f->f_path.dentry->d_inode; + + if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) + ipos = inode->i_size; + else + ipos = *pos; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld", + (unsigned)n, (unsigned)n, obj->obj_id, ipos); + + n_written = yaffs_wr_file(obj, buf, ipos, n, 0); + + yaffs_set_super_dirty(dev); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_file_write: %d(%x) bytes written", + (unsigned)n, (unsigned)n); + + if (n_written > 0) { + ipos += n_written; + *pos = ipos; + if (ipos > inode->i_size) { + inode->i_size = ipos; + inode->i_blocks = (ipos + 511) >> 9; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_file_write size updated to %lld bytes, %d blocks", + ipos, (int)(inode->i_blocks)); + } + + } + yaffs_gross_unlock(dev); + return (n_written == 0) && (n > 0) ? -ENOSPC : n_written; +} + + +#if (YAFFS_USE_WRITE_BEGIN_END > 0) +static int yaffs_write_end(struct file *filp, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *pg, void *fsdadata) +{ + int ret = 0; + void *addr, *kva; + uint32_t offset_into_page = pos & (PAGE_SIZE - 1); + + kva = kmap(pg); + addr = kva + offset_into_page; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_write_end addr %p pos %lld n_bytes %d", + addr, pos, copied); + + ret = yaffs_file_write(filp, addr, copied, &pos); + + if (ret != copied) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_write_end not same size ret %d copied %d", + ret, copied); + SetPageError(pg); + } + + kunmap(pg); + + yaffs_release_space(filp); + unlock_page(pg); + put_page(pg); + return ret; +} +#else + +static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, + unsigned to) +{ + void *addr, *kva; + + loff_t pos = (((loff_t) pg->index) << PAGE_SHIFT) + offset; + int n_bytes = to - offset; + int n_written; + + kva = kmap(pg); + addr = kva + offset; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_commit_write addr %p pos %lld n_bytes %d", + addr, pos, n_bytes); + + n_written = yaffs_file_write(f, addr, n_bytes, &pos); + + if (n_written != n_bytes) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_commit_write not same size n_written %d n_bytes %d", + n_written, n_bytes); + SetPageError(pg); + } + kunmap(pg); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_commit_write returning %d", + n_written == n_bytes ? 0 : n_written); + + return n_written == n_bytes ? 0 : n_written; +} +#endif + +static struct address_space_operations yaffs_file_address_operations = { + .readpage = yaffs_readpage, + .writepage = yaffs_writepage, +#if (YAFFS_USE_WRITE_BEGIN_END > 0) + .write_begin = yaffs_write_begin, + .write_end = yaffs_write_end, +#else + .prepare_write = yaffs_prepare_write, + .commit_write = yaffs_commit_write, +#endif +}; + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) +#define YCRED_FSUID() from_kuid(&init_user_ns, current_fsuid()) +#define YCRED_FSGID() from_kgid(&init_user_ns, current_fsgid()) +#else +#define YCRED_FSUID() YCRED(current)->fsuid +#define YCRED_FSGID() YCRED(current)->fsgid + +static inline uid_t i_uid_read(const struct inode *inode) +{ + return inode->i_uid; +} + +static inline gid_t i_gid_read(const struct inode *inode) +{ + return inode->i_gid; +} + +static inline void i_uid_write(struct inode *inode, uid_t uid) +{ + inode->i_uid = uid; +} + +static inline void i_gid_write(struct inode *inode, gid_t gid) +{ + inode->i_gid = gid; +} +#endif + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) +static int yaffs_file_flush(struct file *file, fl_owner_t id) +#else +static int yaffs_file_flush(struct file *file) +#endif +{ + struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_path.dentry); + + struct yaffs_dev *dev = obj->my_dev; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_file_flush object %d (%s)", + obj->obj_id, + obj->dirty ? "dirty" : "clean"); + + yaffs_gross_lock(dev); + + yaffs_flush_file(obj, 1, 0); + + yaffs_gross_unlock(dev); + + return 0; +} + + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) +static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync) +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34)) +static int yaffs_sync_object(struct file *file, int datasync) +#else +static int yaffs_sync_object(struct file *file, struct dentry *dentry, + int datasync) +#endif +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34)) + struct dentry *dentry = file->f_path.dentry; +#endif + + obj = yaffs_dentry_to_obj(dentry); + + dev = obj->my_dev; + + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, + "yaffs_sync_object"); + yaffs_gross_lock(dev); + yaffs_flush_file(obj, 1, datasync); + yaffs_gross_unlock(dev); + return 0; +} + + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22)) +static const struct file_operations yaffs_file_operations = { + .read_iter = generic_file_read_iter, + .write_iter = generic_file_write_iter, + .mmap = generic_file_mmap, + .flush = yaffs_file_flush, + .fsync = yaffs_sync_object, + .splice_read = generic_file_splice_read, + .splice_write = iter_file_splice_write, + .llseek = generic_file_llseek, +}; + +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)) + +static const struct file_operations yaffs_file_operations = { + .read = do_sync_read, + .write = do_sync_write, + .aio_read = generic_file_aio_read, + .aio_write = generic_file_aio_write, + .mmap = generic_file_mmap, + .flush = yaffs_file_flush, + .fsync = yaffs_sync_object, + .sendfile = generic_file_sendfile, +}; + +#else + +static const struct file_operations yaffs_file_operations = { + .read = generic_file_read, + .write = generic_file_write, + .mmap = generic_file_mmap, + .flush = yaffs_file_flush, + .fsync = yaffs_sync_object, +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) + .sendfile = generic_file_sendfile, +#endif +}; +#endif + + + + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)) +static void zero_user_segment(struct page *page, unsigned start, unsigned end) +{ + void *kaddr = kmap_atomic(page, KM_USER0); + memset(kaddr + start, 0, end - start); + kunmap_atomic(kaddr, KM_USER0); + flush_dcache_page(page); +} +#endif + + +static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize) +{ +#ifdef YAFFS_USE_TRUNCATE_SETSIZE + truncate_setsize(inode, newsize); + return 0; +#else + truncate_inode_pages(&inode->i_data, newsize); + return 0; +#endif + +} + + +static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr) +{ +#ifdef YAFFS_USE_SETATTR_COPY + setattr_copy(inode, attr); + return 0; +#else + return inode_setattr(inode, attr); +#endif + +} + +static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = dentry->d_inode; + int error = 0; + struct yaffs_dev *dev; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_setattr of object %d", + yaffs_inode_to_obj(inode)->obj_id); +#if 0 + /* Fail if a requested resize >= 2GB */ + if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31)) + error = -EINVAL; +#endif + + if (error == 0) + error = setattr_prepare(dentry, attr); + if (error == 0) { + int result; + if (!error) { + error = yaffs_vfs_setattr(inode, attr); + yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called"); + if (attr->ia_valid & ATTR_SIZE) { + yaffs_vfs_setsize(inode, attr->ia_size); + inode->i_blocks = (inode->i_size + 511) >> 9; + } + } + dev = yaffs_inode_to_obj(inode)->my_dev; + if (attr->ia_valid & ATTR_SIZE) { + yaffs_trace(YAFFS_TRACE_OS, + "resize to %d(%x)", + (int)(attr->ia_size), + (int)(attr->ia_size)); + } + yaffs_gross_lock(dev); + result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr); + if (result == YAFFS_OK) { + error = 0; + } else { + error = -EPERM; + } + yaffs_gross_unlock(dev); + + } + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error); + + return error; +} + +static int yaffs_setxattr(struct dentry *dentry, struct inode *inode, + const char *name, const void *value, size_t size, + int flags) +{ + int error = 0; + struct yaffs_dev *dev; + struct yaffs_obj *obj = yaffs_inode_to_obj(inode); + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id); + + /* Currently we don't support posix ACL so never accept any settings + * start with "system.posix_acl_". + */ + if (strncmp(name, "system.posix_acl_", 17)) + error = -EOPNOTSUPP; + + if (error == 0) { + int result; + dev = obj->my_dev; + yaffs_gross_lock(dev); + result = yaffs_set_xattrib(obj, name, value, size, flags); + if (result == YAFFS_OK) + error = 0; + else if (result < 0) + error = result; + yaffs_gross_unlock(dev); + + } + yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error); + + return error; +} + +static ssize_t yaffs_getxattr(struct dentry * dentry, struct inode *inode, + const char *name, void *buff, size_t size) +{ + int error = 0; + struct yaffs_dev *dev; + struct yaffs_obj *obj = yaffs_inode_to_obj(inode); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_getxattr \"%s\" from object %d", + name, obj->obj_id); + + if (error == 0) { + dev = obj->my_dev; + yaffs_gross_lock(dev); + error = yaffs_get_xattrib(obj, name, buff, size); + yaffs_gross_unlock(dev); + + } + yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error); + + return error; +} + +static int yaffs_removexattr(struct dentry *dentry, const char *name) +{ + struct inode *inode = dentry->d_inode; + int error = 0; + struct yaffs_dev *dev; + struct yaffs_obj *obj = yaffs_inode_to_obj(inode); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_removexattr of object %d", obj->obj_id); + + if (error == 0) { + int result; + dev = obj->my_dev; + yaffs_gross_lock(dev); + result = yaffs_remove_xattrib(obj, name); + if (result == YAFFS_OK) + error = 0; + else if (result < 0) + error = result; + yaffs_gross_unlock(dev); + + } + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_removexattr done returning %d", error); + + return error; +} + +static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size) +{ + struct inode *inode = dentry->d_inode; + int error = 0; + struct yaffs_dev *dev; + struct yaffs_obj *obj = yaffs_inode_to_obj(inode); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_listxattr of object %d", obj->obj_id); + + if (error == 0) { + dev = obj->my_dev; + yaffs_gross_lock(dev); + error = yaffs_list_xattrib(obj, buff, size); + yaffs_gross_unlock(dev); + + } + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_listxattr done returning %d", error); + + return error; +} + + +static const struct inode_operations yaffs_file_inode_operations = { + .setattr = yaffs_setattr, + .listxattr = yaffs_listxattr, +}; + + +static int yaffs_readlink(struct dentry *dentry, char __user * buffer, + int buflen) +{ + unsigned char *alias; + int ret; + + struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; + + yaffs_gross_lock(dev); + + alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); + + yaffs_gross_unlock(dev); + + if (!alias) + return -ENOMEM; + + ret = readlink_copy(buffer, buflen, alias); + kfree(alias); + return ret; +} + +#if (YAFFS_NEW_FOLLOW_LINK == 1) +static const char *yaffs_get_link(struct dentry *dentry, struct inode *inode, + struct delayed_call *done) +{ + void *ret; +#else +static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + int ret +#endif + unsigned char *alias; + int ret_int = 0; + struct yaffs_dev *dev; + + if (!dentry) + return ERR_PTR(-ECHILD); + + dev = yaffs_dentry_to_obj(dentry)->my_dev; + yaffs_gross_lock(dev); + + alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); + yaffs_gross_unlock(dev); + + if (!alias) { + ret_int = -ENOMEM; + goto out; + } +#if (YAFFS_NEW_FOLLOW_LINK == 1) + set_delayed_call(done, kfree_link, alias); + ret = alias; +out: + if (ret_int) + ret = ERR_PTR(ret_int); + return ret; +#else + ret = vfs_follow_link(nd, alias); + kfree(alias); +out: + if (ret_int) + ret = ret_int; + return ret; +#endif +} + + +#ifdef YAFFS_HAS_PUT_INODE + +/* For now put inode is just for debugging + * Put inode is called when the inode **structure** is put. + */ +static void yaffs_put_inode(struct inode *inode) +{ + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_put_inode: ino %d, count %d"), + (int)inode->i_ino, atomic_read(&inode->i_count); + +} +#endif + +static const struct inode_operations yaffs_symlink_inode_operations = { + .readlink = yaffs_readlink, +#if (YAFFS_NEW_FOLLOW_LINK == 1) + .get_link = yaffs_get_link, +#else + .follow_link = yaffs_follow_link, +#endif + .setattr = yaffs_setattr, + .listxattr = yaffs_listxattr, +}; + +#ifdef YAFFS_USE_OWN_IGET + +static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino) +{ + struct inode *inode; + struct yaffs_obj *obj; + struct yaffs_dev *dev = yaffs_super_to_dev(sb); + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino); + + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; + + /* NB This is called as a side effect of other functions, but + * we had to release the lock to prevent deadlocks, so + * need to lock again. + */ + + yaffs_gross_lock(dev); + + obj = yaffs_find_by_number(dev, inode->i_ino); + + yaffs_fill_inode_from_obj(inode, obj); + + yaffs_gross_unlock(dev); + + unlock_new_inode(inode); + return inode; +} + +#else + +static void yaffs_read_inode(struct inode *inode) +{ + /* NB This is called as a side effect of other functions, but + * we had to release the lock to prevent deadlocks, so + * need to lock again. + */ + + struct yaffs_obj *obj; + struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_read_inode for %d", (int)inode->i_ino); + + if (current != yaffs_dev_to_lc(dev)->readdir_process) + yaffs_gross_lock(dev); + + obj = yaffs_find_by_number(dev, inode->i_ino); + + yaffs_fill_inode_from_obj(inode, obj); + + if (current != yaffs_dev_to_lc(dev)->readdir_process) + yaffs_gross_unlock(dev); +} + +#endif + + + +struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, + struct yaffs_obj *obj) +{ + struct inode *inode; + + if (!sb) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_get_inode for NULL super_block!!"); + return NULL; + + } + + if (!obj) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_get_inode for NULL object!!"); + return NULL; + + } + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_get_inode for object %d", obj->obj_id); + + inode = Y_IGET(sb, obj->obj_id); + if (IS_ERR(inode)) + return NULL; + + /* NB Side effect: iget calls back to yaffs_read_inode(). */ + /* iget also increments the inode's i_count */ + /* NB You can't be holding gross_lock or deadlock will happen! */ + + return inode; +} + + + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) +#define YCRED(x) x +#else +#define YCRED(x) (x->cred) +#endif + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)) +static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, + dev_t rdev) +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, + dev_t rdev) +#else +static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, + int rdev) +#endif +{ + struct inode *inode; + + struct yaffs_obj *obj = NULL; + struct yaffs_dev *dev; + + struct yaffs_obj *parent = yaffs_inode_to_obj(dir); + + int error = -ENOSPC; + + uid_t uid = YCRED_FSUID(); + gid_t gid = (dir->i_mode & S_ISGID) ? i_gid_read(dir) : YCRED_FSGID(); + + if ((dir->i_mode & S_ISGID) && S_ISDIR(mode)) + mode |= S_ISGID; + + if (parent) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_mknod: parent object %d type %d", + parent->obj_id, parent->variant_type); + } else { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_mknod: could not get parent object"); + return -EPERM; + } + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_mknod: making oject for %s, mode %x dev %x", + dentry->d_name.name, mode, rdev); + + dev = parent->my_dev; + + yaffs_gross_lock(dev); + + switch (mode & S_IFMT) { + default: + /* Special (socket, fifo, device...) */ + yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special"); +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) + obj = + yaffs_create_special(parent, dentry->d_name.name, mode, uid, + gid, old_encode_dev(rdev)); +#else + obj = + yaffs_create_special(parent, dentry->d_name.name, mode, uid, + gid, rdev); +#endif + break; + case S_IFREG: /* file */ + yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file"); + obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid, + gid); + break; + case S_IFDIR: /* directory */ + yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory"); + obj = yaffs_create_dir(parent, dentry->d_name.name, mode, + uid, gid); + break; + case S_IFLNK: /* symlink */ + yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink"); + obj = NULL; /* Do we ever get here? */ + break; + } + + /* Can not call yaffs_get_inode() with gross lock held */ + yaffs_gross_unlock(dev); + + if (obj) { + inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj); + d_instantiate(dentry, inode); + update_dir_time(dir); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_mknod created object %d count = %d", + obj->obj_id, atomic_read(&inode->i_count)); + error = 0; + yaffs_fill_inode_from_obj(dir, parent); + } else { + yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object"); + error = -ENOMEM; + } + + return error; +} + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)) +static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +#else +static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) +#endif +{ + int ret_val; + yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir"); + ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); + return ret_val; +} + + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)) +static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode, + bool dummy) +#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)) +static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode, + struct nameidata *n) +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *n) +#else +static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode) +#endif +{ + yaffs_trace(YAFFS_TRACE_OS, "yaffs_create"); + return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); +} + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)) +static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, + unsigned int dummy) +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *n) +#else +static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry) +#endif +{ + struct yaffs_obj *obj; + struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */ + + struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev; + + if (current != yaffs_dev_to_lc(dev)->readdir_process) + yaffs_gross_lock(dev); + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s", + yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name); + + obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name); + + obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */ + + /* Can't hold gross lock when calling yaffs_get_inode() */ + if (current != yaffs_dev_to_lc(dev)->readdir_process) + yaffs_gross_unlock(dev); + + if (obj) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_lookup found %d", obj->obj_id); + + inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); + } else { + yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found"); + + } + +/* added NCB for 2.5/6 compatability - forces add even if inode is + * NULL which creates dentry hash */ + d_add(dentry, inode); + + return NULL; +} + +/* + * Create a link... + */ +static int yaffs_link(struct dentry *old_dentry, struct inode *dir, + struct dentry *dentry) +{ + struct inode *inode = old_dentry->d_inode; + struct yaffs_obj *obj = NULL; + struct yaffs_obj *link = NULL; + struct yaffs_dev *dev; + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_link"); + + obj = yaffs_inode_to_obj(inode); + dev = obj->my_dev; + + yaffs_gross_lock(dev); + + if (!S_ISDIR(inode->i_mode)) /* Don't link directories */ + link = + yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name, + obj); + + if (link) { + set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj)); + d_instantiate(dentry, old_dentry->d_inode); + atomic_inc(&old_dentry->d_inode->i_count); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_link link count %d i_count %d", + old_dentry->d_inode->i_nlink, + atomic_read(&old_dentry->d_inode->i_count)); + } + + yaffs_gross_unlock(dev); + + if (link) { + update_dir_time(dir); + return 0; + } + + return -EPERM; +} + +static int yaffs_symlink(struct inode *dir, struct dentry *dentry, + const char *symname) +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; + uid_t uid = YCRED_FSUID(); + gid_t gid = (dir->i_mode & S_ISGID) ? i_gid_read(dir) : YCRED_FSGID(); + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink"); + + if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) > + YAFFS_MAX_NAME_LENGTH) + return -ENAMETOOLONG; + + if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) > + YAFFS_MAX_ALIAS_LENGTH) + return -ENAMETOOLONG; + + dev = yaffs_inode_to_obj(dir)->my_dev; + yaffs_gross_lock(dev); + obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name, + S_IFLNK | S_IRWXUGO, uid, gid, symname); + yaffs_gross_unlock(dev); + + if (obj) { + struct inode *inode; + + inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); + d_instantiate(dentry, inode); + update_dir_time(dir); + yaffs_trace(YAFFS_TRACE_OS, "symlink created OK"); + return 0; + } else { + yaffs_trace(YAFFS_TRACE_OS, "symlink not created"); + } + + return -ENOMEM; +} + +/* + * The VFS layer already does all the dentry stuff for rename. + * + * NB: POSIX says you can rename an object over an old object of the same name + */ +static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry, + unsigned int flags) +{ + struct yaffs_dev *dev; + int ret_val = YAFFS_FAIL; + struct yaffs_obj *target; + + if (flags) + return -EINVAL; + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename"); + dev = yaffs_inode_to_obj(old_dir)->my_dev; + + yaffs_gross_lock(dev); + + /* Check if the target is an existing directory that is not empty. */ + target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir), + new_dentry->d_name.name); + + if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY && + !list_empty(&target->variant.dir_variant.children)) { + + yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir"); + + ret_val = YAFFS_FAIL; + } else { + /* Now does unlinking internally using shadowing mechanism */ + yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj"); + + ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir), + old_dentry->d_name.name, + yaffs_inode_to_obj(new_dir), + new_dentry->d_name.name); + } + yaffs_gross_unlock(dev); + + if (ret_val == YAFFS_OK) { + if (target) + inode_dec_link_count(new_dentry->d_inode); + + update_dir_time(old_dir); + if (old_dir != new_dir) + update_dir_time(new_dir); + return 0; + } else { + return -ENOTEMPTY; + } +} + + + + +static int yaffs_unlink(struct inode *dir, struct dentry *dentry) +{ + int ret_val; + + struct yaffs_dev *dev; + struct yaffs_obj *obj; + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s", + (int)(dir->i_ino), dentry->d_name.name); + obj = yaffs_inode_to_obj(dir); + dev = obj->my_dev; + + yaffs_gross_lock(dev); + + ret_val = yaffs_unlinker(obj, dentry->d_name.name); + + if (ret_val == YAFFS_OK) { + inode_dec_link_count(dentry->d_inode); + atomic64_inc(&dir->i_version); + yaffs_gross_unlock(dev); + update_dir_time(dir); + return 0; + } + yaffs_gross_unlock(dev); + return -ENOTEMPTY; +} + + + +static const struct inode_operations yaffs_dir_inode_operations = { + .create = yaffs_create, + .lookup = yaffs_lookup, + .link = yaffs_link, + .unlink = yaffs_unlink, + .symlink = yaffs_symlink, + .mkdir = yaffs_mkdir, + .rmdir = yaffs_unlink, + .mknod = yaffs_mknod, + .rename = yaffs_rename, + .setattr = yaffs_setattr, + .listxattr = yaffs_listxattr, +}; + +/*-----------------------------------------------------------------*/ +/* Directory search context allows us to unlock access to yaffs during + * filldir without causing problems with the directory being modified. + * This is similar to the tried and tested mechanism used in yaffs direct. + * + * A search context iterates along a doubly linked list of siblings in the + * directory. If the iterating object is deleted then this would corrupt + * the list iteration, likely causing a crash. The search context avoids + * this by using the remove_obj_fn to move the search context to the + * next object before the object is deleted. + * + * Many readdirs (and thus seach conexts) may be alive simulateously so + * each struct yaffs_dev has a list of these. + * + * A seach context lives for the duration of a readdir. + * + * All these functions must be called while yaffs is locked. + */ + +struct yaffs_search_context { + struct yaffs_dev *dev; + struct yaffs_obj *dir_obj; + struct yaffs_obj *next_return; + struct list_head others; +}; + +/* + * yaffs_new_search() creates a new search context, initialises it and + * adds it to the device's search context list. + * + * Called at start of readdir. + */ +static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir) +{ + struct yaffs_dev *dev = dir->my_dev; + struct yaffs_search_context *sc = + kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS); + if (sc) { + sc->dir_obj = dir; + sc->dev = dev; + if (list_empty(&sc->dir_obj->variant.dir_variant.children)) + sc->next_return = NULL; + else + sc->next_return = + list_entry(dir->variant.dir_variant.children.next, + struct yaffs_obj, siblings); + INIT_LIST_HEAD(&sc->others); + list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts)); + } + return sc; +} + +/* + * yaffs_search_end() disposes of a search context and cleans up. + */ +static void yaffs_search_end(struct yaffs_search_context *sc) +{ + if (sc) { + list_del(&sc->others); + kfree(sc); + } +} + +/* + * yaffs_search_advance() moves a search context to the next object. + * Called when the search iterates or when an object removal causes + * the search context to be moved to the next object. + */ +static void yaffs_search_advance(struct yaffs_search_context *sc) +{ + if (!sc) + return; + + if (sc->next_return == NULL || + list_empty(&sc->dir_obj->variant.dir_variant.children)) + sc->next_return = NULL; + else { + struct list_head *next = sc->next_return->siblings.next; + + if (next == &sc->dir_obj->variant.dir_variant.children) + sc->next_return = NULL; /* end of list */ + else + sc->next_return = + list_entry(next, struct yaffs_obj, siblings); + } +} + +/* + * yaffs_remove_obj_callback() is called when an object is unlinked. + * We check open search contexts and advance any which are currently + * on the object being iterated. + */ +static void yaffs_remove_obj_callback(struct yaffs_obj *obj) +{ + + struct list_head *i; + struct yaffs_search_context *sc; + struct list_head *search_contexts = + &(yaffs_dev_to_lc(obj->my_dev)->search_contexts); + + /* Iterate through the directory search contexts. + * If any are currently on the object being removed, then advance + * the search context to the next object to prevent a hanging pointer. + */ + list_for_each(i, search_contexts) { + sc = list_entry(i, struct yaffs_search_context, others); + if (sc->next_return == obj) + yaffs_search_advance(sc); + } + +} + + +/*-----------------------------------------------------------------*/ + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0)) +static int yaffs_readdir(struct file *file, struct dir_context *ctx) +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; + struct yaffs_search_context *sc; + struct inode *inode = file->f_path.dentry->d_inode; + unsigned long offset, curoffs; + struct yaffs_obj *l; + int ret_val = 0; + + char name[YAFFS_MAX_NAME_LENGTH + 1]; + u64 i_version; + + obj = yaffs_dentry_to_obj(file->f_path.dentry); + dev = obj->my_dev; + + yaffs_gross_lock(dev); + + yaffs_dev_to_lc(dev)->readdir_process = current; + + offset = ctx->pos; + + sc = yaffs_new_search(obj); + if (!sc) { + ret_val = -ENOMEM; + goto out; + } + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: starting at %d", (int)offset); + + if (offset == 0) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: entry . ino %d", + (int)inode->i_ino); + yaffs_gross_unlock(dev); + if (!dir_emit_dot(file, ctx)) { + yaffs_gross_lock(dev); + goto out; + } + yaffs_gross_lock(dev); + offset++; + ctx->pos++; + } + if (offset == 1) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: entry .. ino %d", + (int)file->f_path.dentry->d_parent->d_inode->i_ino); + yaffs_gross_unlock(dev); + if (!dir_emit_dotdot(file, ctx)) { + yaffs_gross_lock(dev); + goto out; + } + yaffs_gross_lock(dev); + offset++; + ctx->pos++; + } + + curoffs = 1; + + /* If the directory has changed since the open or last call to + readdir, rewind to after the 2 canned entries. */ + i_version = atomic64_read(&inode->i_version); + if (file->f_version != i_version) { + offset = 2; + ctx->pos = offset; + file->f_version = i_version; + } + + while (sc->next_return) { + curoffs++; + l = sc->next_return; + if (curoffs >= offset) { + int this_inode = yaffs_get_obj_inode(l); + int this_type = yaffs_get_obj_type(l); + + yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: %s inode %d", + name, yaffs_get_obj_inode(l)); + + yaffs_gross_unlock(dev); + + if (!dir_emit(ctx, name, strlen(name), + this_inode, this_type)) { + yaffs_gross_lock(dev); + goto out; + } + + yaffs_gross_lock(dev); + + offset++; + ctx->pos++; + } + yaffs_search_advance(sc); + } + +out: + yaffs_search_end(sc); + yaffs_dev_to_lc(dev)->readdir_process = NULL; + yaffs_gross_unlock(dev); + + return ret_val; +} +#else +static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; + struct yaffs_search_context *sc; + struct inode *inode = f->f_path.dentry->d_inode; + unsigned long offset, curoffs; + struct yaffs_obj *l; + int ret_val = 0; + + char name[YAFFS_MAX_NAME_LENGTH + 1]; + + obj = yaffs_dentry_to_obj(f->f_path.dentry); + dev = obj->my_dev; + + yaffs_gross_lock(dev); + + yaffs_dev_to_lc(dev)->readdir_process = current; + + offset = f->f_pos; + + sc = yaffs_new_search(obj); + if (!sc) { + ret_val = -ENOMEM; + goto out; + } + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: starting at %d", (int)offset); + + if (offset == 0) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: entry . ino %d", + (int)inode->i_ino); + yaffs_gross_unlock(dev); + if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) { + yaffs_gross_lock(dev); + goto out; + } + yaffs_gross_lock(dev); + offset++; + f->f_pos++; + } + if (offset == 1) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: entry .. ino %d", + (int)f->f_path.dentry->d_parent->d_inode->i_ino); + yaffs_gross_unlock(dev); + if (filldir(dirent, "..", 2, offset, + f->f_path.dentry->d_parent->d_inode->i_ino, + DT_DIR) < 0) { + yaffs_gross_lock(dev); + goto out; + } + yaffs_gross_lock(dev); + offset++; + f->f_pos++; + } + + curoffs = 1; + + /* If the directory has changed since the open or last call to + readdir, rewind to after the 2 canned entries. */ + if (f->f_version != inode->i_version) { + offset = 2; + f->f_pos = offset; + f->f_version = inode->i_version; + } + + while (sc->next_return) { + curoffs++; + l = sc->next_return; + if (curoffs >= offset) { + int this_inode = yaffs_get_obj_inode(l); + int this_type = yaffs_get_obj_type(l); + + yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readdir: %s inode %d", + name, yaffs_get_obj_inode(l)); + + yaffs_gross_unlock(dev); + + if (filldir(dirent, + name, + strlen(name), + offset, this_inode, this_type) < 0) { + yaffs_gross_lock(dev); + goto out; + } + + yaffs_gross_lock(dev); + + offset++; + f->f_pos++; + } + yaffs_search_advance(sc); + } + +out: + yaffs_search_end(sc); + yaffs_dev_to_lc(dev)->readdir_process = NULL; + yaffs_gross_unlock(dev); + + return ret_val; +} +#endif + +static const struct file_operations yaffs_dir_operations = { + .read = generic_read_dir, +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0)) + .iterate = yaffs_readdir, +#else + .readdir = yaffs_readdir, +#endif + .fsync = yaffs_sync_object, + .llseek = generic_file_llseek, +}; + +static void yaffs_fill_inode_from_obj(struct inode *inode, + struct yaffs_obj *obj) +{ + if (inode && obj) { + + /* Check mode against the variant type and attempt to repair if broken. */ + u32 mode = obj->yst_mode; + switch (obj->variant_type) { + case YAFFS_OBJECT_TYPE_FILE: + if (!S_ISREG(mode)) { + obj->yst_mode &= ~S_IFMT; + obj->yst_mode |= S_IFREG; + } + + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + if (!S_ISLNK(mode)) { + obj->yst_mode &= ~S_IFMT; + obj->yst_mode |= S_IFLNK; + } + + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + if (!S_ISDIR(mode)) { + obj->yst_mode &= ~S_IFMT; + obj->yst_mode |= S_IFDIR; + } + + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_SPECIAL: + default: + /* TODO? */ + break; + } + + inode->i_flags |= S_NOATIME; + + inode->i_ino = obj->obj_id; + inode->i_mode = obj->yst_mode; + i_uid_write(inode, obj->yst_uid); + i_gid_write(inode, obj->yst_gid); +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)) + inode->i_blksize = inode->i_sb->s_blocksize; +#endif +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) + + inode->i_rdev = old_decode_dev(obj->yst_rdev); + inode->i_atime.tv_sec = (time_t) (obj->yst_atime); + inode->i_atime.tv_nsec = 0; + inode->i_mtime.tv_sec = (time_t) obj->yst_mtime; + inode->i_mtime.tv_nsec = 0; + inode->i_ctime.tv_sec = (time_t) obj->yst_ctime; + inode->i_ctime.tv_nsec = 0; +#else + inode->i_rdev = obj->yst_rdev; + inode->i_atime = obj->yst_atime; + inode->i_mtime = obj->yst_mtime; + inode->i_ctime = obj->yst_ctime; +#endif + inode->i_size = yaffs_get_obj_length(obj); + inode->i_blocks = (inode->i_size + 511) >> 9; + + set_nlink(inode, yaffs_get_obj_link_count(obj)); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_fill_inode mode %x uid %d gid %d size %lld count %d", + inode->i_mode, i_uid_read(inode), i_gid_read(inode), + inode->i_size, atomic_read(&inode->i_count)); + + switch (obj->yst_mode & S_IFMT) { + default: /* fifo, device or socket */ +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) + init_special_inode(inode, obj->yst_mode, + old_decode_dev(obj->yst_rdev)); +#else + init_special_inode(inode, obj->yst_mode, + (dev_t) (obj->yst_rdev)); +#endif + break; + case S_IFREG: /* file */ + inode->i_op = &yaffs_file_inode_operations; + inode->i_fop = &yaffs_file_operations; + inode->i_mapping->a_ops = + &yaffs_file_address_operations; + break; + case S_IFDIR: /* directory */ + inode->i_op = &yaffs_dir_inode_operations; + inode->i_fop = &yaffs_dir_operations; + break; + case S_IFLNK: /* symlink */ + inode->i_op = &yaffs_symlink_inode_operations; + break; + } + + yaffs_inode_to_obj_lv(inode) = obj; + + obj->my_inode = inode; + + } else { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_fill_inode invalid parameters"); + } + +} + + + +/* + * yaffs background thread functions . + * yaffs_bg_thread_fn() the thread function + * yaffs_bg_start() launches the background thread. + * yaffs_bg_stop() cleans up the background thread. + * + * NB: + * The thread should only run after the yaffs is initialised + * The thread should be stopped before yaffs is unmounted. + * The thread should not do any writing while the fs is in read only. + */ + +static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev) +{ + unsigned erased_chunks = + dev->n_erased_blocks * dev->param.chunks_per_block; + struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); + unsigned scattered = 0; /* Free chunks not in an erased block */ + + if (erased_chunks < dev->n_free_chunks) + scattered = (dev->n_free_chunks - erased_chunks); + + if (!context->bg_running) + return 0; + else if (scattered < (dev->param.chunks_per_block * 2)) + return 0; + else if (erased_chunks > dev->n_free_chunks / 2) + return 0; + else if (erased_chunks > dev->n_free_chunks / 4) + return 1; + else + return 2; +} + +#ifdef YAFFS_COMPILE_BACKGROUND +struct yaffs_timer { + struct timer_list timer; + struct task_struct *tsk; +}; + +void yaffs_background_waker(struct timer_list *t) +{ + struct yaffs_timer *yt = from_timer(yt, t, timer); + + wake_up_process(yt->tsk); +} + +static int yaffs_bg_thread_fn(void *data) +{ + struct yaffs_dev *dev = (struct yaffs_dev *)data; + struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); + unsigned long now = jiffies; + unsigned long next_dir_update = now; + unsigned long next_gc = now; + unsigned long expires; + unsigned int urgency; + + int gc_result; + struct yaffs_timer yt; + + yaffs_trace(YAFFS_TRACE_BACKGROUND, + "yaffs_background starting for dev %p", (void *)dev); + +#ifdef YAFFS_COMPILE_FREEZER + set_freezable(); +#endif + while (context->bg_running) { + yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background"); + + if (kthread_should_stop()) + break; + +#ifdef YAFFS_COMPILE_FREEZER + if (try_to_freeze()) + continue; +#endif + yaffs_gross_lock(dev); + + now = jiffies; + + if (time_after(now, next_dir_update) && yaffs_bg_enable) { + yaffs_update_dirty_dirs(dev); + next_dir_update = now + HZ; + } + + if (time_after(now, next_gc) && yaffs_bg_enable) { + if (!dev->is_checkpointed) { + urgency = yaffs_bg_gc_urgency(dev); + gc_result = yaffs_bg_gc(dev, urgency); + if (urgency > 1) + next_gc = now + HZ / 20 + 1; + else if (urgency > 0) + next_gc = now + HZ / 10 + 1; + else + next_gc = now + HZ * 2; + } else { + /* + * gc not running so set to next_dir_update + * to cut down on wake ups + */ + next_gc = next_dir_update; + } + } + yaffs_gross_unlock(dev); +#if 1 + expires = next_dir_update; + if (time_before(next_gc, expires)) + expires = next_gc; + if (time_before(expires, now)) + expires = now + HZ; + + Y_INIT_TIMER(&yt.timer); + yt.timer.function = yaffs_background_waker; + yt.timer.expires = expires + 1; + yt.tsk = current; + + set_current_state(TASK_INTERRUPTIBLE); + add_timer(&yt.timer); + schedule(); + del_timer_sync(&yt.timer); +#else + msleep(10); +#endif + } + + return 0; +} + +static int yaffs_bg_start(struct yaffs_dev *dev) +{ + int retval = 0; + struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); + + if (dev->read_only) + return -1; + + context->bg_running = 1; + + context->bg_thread = kthread_run(yaffs_bg_thread_fn, + (void *)dev, "yaffs-bg-%d", + context->mount_id); + + if (IS_ERR(context->bg_thread)) { + retval = PTR_ERR(context->bg_thread); + context->bg_thread = NULL; + context->bg_running = 0; + } + return retval; +} + +static void yaffs_bg_stop(struct yaffs_dev *dev) +{ + struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev); + + ctxt->bg_running = 0; + + if (ctxt->bg_thread) { + kthread_stop(ctxt->bg_thread); + ctxt->bg_thread = NULL; + } +} +#else +static int yaffs_bg_thread_fn(void *data) +{ + return 0; +} + +static int yaffs_bg_start(struct yaffs_dev *dev) +{ + return 0; +} + +static void yaffs_bg_stop(struct yaffs_dev *dev) +{ +} +#endif + + +static void yaffs_flush_inodes(struct super_block *sb) +{ + struct inode *iptr; + struct yaffs_obj *obj; + + list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) { + obj = yaffs_inode_to_obj(iptr); + if (obj) { + yaffs_trace(YAFFS_TRACE_OS, + "flushing obj %d", + obj->obj_id); + yaffs_flush_file(obj, 1, 0); + } + } +} + +static void yaffs_flush_super(struct super_block *sb, int do_checkpoint) +{ + struct yaffs_dev *dev = yaffs_super_to_dev(sb); + if (!dev) + return; + + yaffs_flush_inodes(sb); + yaffs_update_dirty_dirs(dev); + yaffs_flush_whole_cache(dev); + if (do_checkpoint) + yaffs_checkpoint_save(dev); +} + +static LIST_HEAD(yaffs_context_list); +struct mutex yaffs_context_lock; + +static void yaffs_put_super(struct super_block *sb) +{ + struct yaffs_dev *dev = yaffs_super_to_dev(sb); + struct mtd_info *mtd = yaffs_dev_to_mtd(dev); + + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS, + "yaffs_put_super"); + + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, + "Shutting down yaffs background thread"); + yaffs_bg_stop(dev); + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, + "yaffs background thread shut down"); + + yaffs_gross_lock(dev); + + yaffs_flush_super(sb, 1); + + yaffs_deinitialise(dev); + + yaffs_gross_unlock(dev); + + mutex_lock(&yaffs_context_lock); + list_del_init(&(yaffs_dev_to_lc(dev)->context_list)); + mutex_unlock(&yaffs_context_lock); + + if (yaffs_dev_to_lc(dev)->spare_buffer) { + kfree(yaffs_dev_to_lc(dev)->spare_buffer); + yaffs_dev_to_lc(dev)->spare_buffer = NULL; + } + + if (dev->os_context) + kfree(dev->os_context); + + kfree(dev); + + yaffs_put_mtd_device(mtd); + + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS, + "yaffs_put_super done"); +} + + +static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) +{ + return yaffs_gc_control; +} + + +#ifdef YAFFS_COMPILE_EXPORTFS + +static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, + uint32_t generation) +{ + return Y_IGET(sb, ino); +} + +static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb, + struct fid *fid, int fh_len, + int fh_type) +{ + return generic_fh_to_dentry(sb, fid, fh_len, fh_type, + yaffs2_nfs_get_inode); +} + +static struct dentry *yaffs2_fh_to_parent(struct super_block *sb, + struct fid *fid, int fh_len, + int fh_type) +{ + return generic_fh_to_parent(sb, fid, fh_len, fh_type, + yaffs2_nfs_get_inode); +} + +struct dentry *yaffs2_get_parent(struct dentry *dentry) +{ + + struct super_block *sb = dentry->d_inode->i_sb; + struct dentry *parent = ERR_PTR(-ENOENT); + struct inode *inode; + unsigned long parent_ino; + struct yaffs_obj *d_obj; + struct yaffs_obj *parent_obj; + + d_obj = yaffs_inode_to_obj(dentry->d_inode); + + if (d_obj) { + parent_obj = d_obj->parent; + if (parent_obj) { + parent_ino = yaffs_get_obj_inode(parent_obj); + inode = Y_IGET(sb, parent_ino); + + if (IS_ERR(inode)) { + parent = ERR_CAST(inode); + } else { + parent = d_obtain_alias(inode); + if (!IS_ERR(parent)) { + parent = ERR_PTR(-ENOMEM); + iput(inode); + } + } + } + } + + return parent; +} + +/* Just declare a zero structure as a NULL value implies + * using the default functions of exportfs. + */ + +static struct export_operations yaffs_export_ops = { + .fh_to_dentry = yaffs2_fh_to_dentry, + .fh_to_parent = yaffs2_fh_to_parent, + .get_parent = yaffs2_get_parent, +}; + +#endif + +static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj) +{ + /* Clear the association between the inode and + * the struct yaffs_obj. + */ + obj->my_inode = NULL; + yaffs_inode_to_obj_lv(inode) = NULL; + + /* If the object freeing was deferred, then the real + * free happens now. + * This should fix the inode inconsistency problem. + */ + yaffs_handle_defered_free(obj); +} + +#ifdef YAFFS_HAS_EVICT_INODE +/* yaffs_evict_inode combines into one operation what was previously done in + * yaffs_clear_inode() and yaffs_delete_inode() + * + */ +static void yaffs_evict_inode(struct inode *inode) +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; + int deleteme = 0; + + obj = yaffs_inode_to_obj(inode); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_evict_inode: ino %d, count %d %s", + (int)inode->i_ino, atomic_read(&inode->i_count), + obj ? "object exists" : "null object"); + + if (!inode->i_nlink && !is_bad_inode(inode)) + deleteme = 1; + truncate_inode_pages(&inode->i_data, 0); + Y_CLEAR_INODE(inode); + + if (deleteme && obj) { + dev = obj->my_dev; + yaffs_gross_lock(dev); + yaffs_del_obj(obj); + yaffs_gross_unlock(dev); + } + if (obj) { + dev = obj->my_dev; + yaffs_gross_lock(dev); + yaffs_unstitch_obj(inode, obj); + yaffs_gross_unlock(dev); + } +} +#else + +/* clear is called to tell the fs to release any per-inode data it holds. + * The object might still exist on disk and is just being thrown out of the cache + * or else the object has actually been deleted and we're being called via + * the chain + * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode() + */ + +static void yaffs_clear_inode(struct inode *inode) +{ + struct yaffs_obj *obj; + struct yaffs_dev *dev; + + obj = yaffs_inode_to_obj(inode); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_clear_inode: ino %d, count %d %s", + (int)inode->i_ino, atomic_read(&inode->i_count), + obj ? "object exists" : "null object"); + + if (obj) { + dev = obj->my_dev; + yaffs_gross_lock(dev); + yaffs_unstitch_obj(inode, obj); + yaffs_gross_unlock(dev); + } + +} + +/* delete is called when the link count is zero and the inode + * is put (ie. nobody wants to know about it anymore, time to + * delete the file). + * NB Must call clear_inode() + */ +static void yaffs_delete_inode(struct inode *inode) +{ + struct yaffs_obj *obj = yaffs_inode_to_obj(inode); + struct yaffs_dev *dev; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_delete_inode: ino %d, count %d %s", + (int)inode->i_ino, atomic_read(&inode->i_count), + obj ? "object exists" : "null object"); + + if (obj) { + dev = obj->my_dev; + yaffs_gross_lock(dev); + yaffs_del_obj(obj); + yaffs_gross_unlock(dev); + } +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13)) + truncate_inode_pages(&inode->i_data, 0); +#endif + clear_inode(inode); +} +#endif + + + + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) +static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; + struct super_block *sb = dentry->d_sb; +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf) +{ + struct yaffs_dev *dev = yaffs_super_to_dev(sb); +#else +static int yaffs_statfs(struct super_block *sb, struct statfs *buf) +{ + struct yaffs_dev *dev = yaffs_super_to_dev(sb); +#endif + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs"); + + yaffs_gross_lock(dev); + + buf->f_type = YAFFS_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_namelen = 255; + + if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) { + /* Do this if chunk size is not a power of 2 */ + + uint64_t bytes_in_dev; + uint64_t bytes_free; + + bytes_in_dev = + ((uint64_t) + ((dev->param.end_block - dev->param.start_block + + 1))) * ((uint64_t) (dev->param.chunks_per_block * + dev->data_bytes_per_chunk)); + + do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */ + buf->f_blocks = bytes_in_dev; + + bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) * + ((uint64_t) (dev->data_bytes_per_chunk)); + + do_div(bytes_free, sb->s_blocksize); + + buf->f_bfree = bytes_free; + + } else if (sb->s_blocksize > dev->data_bytes_per_chunk) { + + buf->f_blocks = + (dev->param.end_block - dev->param.start_block + 1) * + dev->param.chunks_per_block / + (sb->s_blocksize / dev->data_bytes_per_chunk); + buf->f_bfree = + yaffs_get_n_free_chunks(dev) / + (sb->s_blocksize / dev->data_bytes_per_chunk); + } else { + buf->f_blocks = + (dev->param.end_block - dev->param.start_block + 1) * + dev->param.chunks_per_block * + (dev->data_bytes_per_chunk / sb->s_blocksize); + + buf->f_bfree = + yaffs_get_n_free_chunks(dev) * + (dev->data_bytes_per_chunk / sb->s_blocksize); + } + + buf->f_files = 0; + buf->f_ffree = 0; + buf->f_bavail = buf->f_bfree; + + yaffs_gross_unlock(dev); + return 0; +} + + + +static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint) +{ + + struct yaffs_dev *dev = yaffs_super_to_dev(sb); + unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4); + unsigned gc_urgent = yaffs_bg_gc_urgency(dev); + int do_checkpoint; + int dirty = yaffs_check_super_dirty(dev); + + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, + "yaffs_do_sync_fs: gc-urgency %d %s %s%s", + gc_urgent, + dirty ? "dirty" : "clean", + request_checkpoint ? "checkpoint requested" : "no checkpoint", + oneshot_checkpoint ? " one-shot" : ""); + + yaffs_gross_lock(dev); + do_checkpoint = ((request_checkpoint && !gc_urgent) || + oneshot_checkpoint) && !dev->is_checkpointed; + + if (dirty || do_checkpoint) { + yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint); + yaffs_clear_super_dirty(dev); + if (oneshot_checkpoint) + yaffs_auto_checkpoint &= ~4; + } + yaffs_gross_unlock(dev); + + return 0; +} + + +#ifdef YAFFS_HAS_WRITE_SUPER +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) +static void yaffs_write_super(struct super_block *sb) +#else +static int yaffs_write_super(struct super_block *sb) +#endif +{ + unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2); + + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, + "yaffs_write_super %s", + request_checkpoint ? " checkpt" : ""); + + yaffs_do_sync_fs(sb, request_checkpoint); + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18)) + return 0; +#endif +} +#endif + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) +static int yaffs_sync_fs(struct super_block *sb, int wait) +#else +static int yaffs_sync_fs(struct super_block *sb) +#endif +{ + unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1); + + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, + "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : ""); + + yaffs_do_sync_fs(sb, request_checkpoint); + + return 0; +} + +/* the function only is used to change dev->read_only when this file system + * is remounted. + */ +static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data) +{ + int read_only = 0; + struct mtd_info *mtd; + struct yaffs_dev *dev = 0; + + /* Get the device */ + mtd = get_mtd_device(NULL, MINOR(sb->s_dev)); + if (!mtd) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device #%u doesn't appear to exist", + MINOR(sb->s_dev)); + return 1; + } + + /* Check it's NAND */ + if (mtd->type != MTD_NANDFLASH) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device is not NAND it's type %d", + mtd->type); + return 1; + } + + read_only = ((*flags & MS_RDONLY) != 0); + if (!read_only && !(mtd->flags & MTD_WRITEABLE)) { + read_only = 1; + printk(KERN_INFO + "yaffs: mtd is read only, setting superblock read only"); + *flags |= MS_RDONLY; + } + + dev = sb->s_fs_info; + dev->read_only = read_only; + + return 0; +} + +static const struct super_operations yaffs_super_ops = { + .statfs = yaffs_statfs, + +#ifndef YAFFS_USE_OWN_IGET + .read_inode = yaffs_read_inode, +#endif +#ifdef YAFFS_HAS_PUT_INODE + .put_inode = yaffs_put_inode, +#endif + .put_super = yaffs_put_super, +#ifdef YAFFS_HAS_EVICT_INODE + .evict_inode = yaffs_evict_inode, +#else + .delete_inode = yaffs_delete_inode, + .clear_inode = yaffs_clear_inode, +#endif + .sync_fs = yaffs_sync_fs, +#ifdef YAFFS_HAS_WRITE_SUPER + .write_super = yaffs_write_super, +#endif + .remount_fs = yaffs_remount_fs, +}; + +struct yaffs_options { + int inband_tags; + int skip_checkpoint_read; + int skip_checkpoint_write; + int no_cache; + int tags_ecc_on; + int tags_ecc_overridden; + int lazy_loading_enabled; + int lazy_loading_overridden; + int empty_lost_and_found; + int empty_lost_and_found_overridden; + int disable_summary; +}; + +#define MAX_OPT_LEN 30 +static int yaffs_parse_options(struct yaffs_options *options, + const char *options_str) +{ + char cur_opt[MAX_OPT_LEN + 1]; + int p; + int error = 0; + + /* Parse through the options which is a comma seperated list */ + + while (options_str && *options_str && !error) { + memset(cur_opt, 0, MAX_OPT_LEN + 1); + p = 0; + + while (*options_str == ',') + options_str++; + + while (*options_str && *options_str != ',') { + if (p < MAX_OPT_LEN) { + cur_opt[p] = *options_str; + p++; + } + options_str++; + } + + if (!strcmp(cur_opt, "inband-tags")) { + options->inband_tags = 1; + } else if (!strcmp(cur_opt, "tags-ecc-off")) { + options->tags_ecc_on = 0; + options->tags_ecc_overridden = 1; + } else if (!strcmp(cur_opt, "tags-ecc-on")) { + options->tags_ecc_on = 1; + options->tags_ecc_overridden = 1; + } else if (!strcmp(cur_opt, "lazy-loading-off")) { + options->lazy_loading_enabled = 0; + options->lazy_loading_overridden = 1; + } else if (!strcmp(cur_opt, "lazy-loading-on")) { + options->lazy_loading_enabled = 1; + options->lazy_loading_overridden = 1; + } else if (!strcmp(cur_opt, "disable-summary")) { + options->disable_summary = 1; + } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) { + options->empty_lost_and_found = 0; + options->empty_lost_and_found_overridden = 1; + } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) { + options->empty_lost_and_found = 1; + options->empty_lost_and_found_overridden = 1; + } else if (!strcmp(cur_opt, "no-cache")) { + options->no_cache = 1; + } else if (!strcmp(cur_opt, "no-checkpoint-read")) { + options->skip_checkpoint_read = 1; + } else if (!strcmp(cur_opt, "no-checkpoint-write")) { + options->skip_checkpoint_write = 1; + } else if (!strcmp(cur_opt, "no-checkpoint")) { + options->skip_checkpoint_read = 1; + options->skip_checkpoint_write = 1; + } else { + printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n", + cur_opt); + error = 1; + } + } + + return error; +} + + +static struct dentry *yaffs_make_root(struct inode *inode) +{ +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)) + struct dentry *root = d_alloc_root(inode); + + if (!root) + iput(inode); + + return root; +#else + return d_make_root(inode); +#endif +} + + +static int yaffs_xattr_get(const struct xattr_handler *handler, + struct dentry *dentry, struct inode *inode, + const char *name, void *buff, size_t size) +{ + return yaffs_getxattr(dentry, inode, name, buff, size); +} + +static int yaffs_xattr_set(const struct xattr_handler *handler, + struct dentry *dentry, struct inode *inode, + const char *name, const void *value, size_t size, + int flags) +{ + if (value) + return yaffs_setxattr(dentry, inode, name, value, size, flags); + else + return yaffs_removexattr(dentry, name); +} + +static const struct xattr_handler yaffs_xattr_handler = { + .prefix = "", /* match anything */ + .get = yaffs_xattr_get, + .set = yaffs_xattr_set, +}; + +static const struct xattr_handler *yaffs_xattr_handlers[] = { + &yaffs_xattr_handler, + NULL +}; + +static struct super_block *yaffs_internal_read_super(int yaffs_version, + struct super_block *sb, + void *data, int silent) +{ + int n_blocks; + struct inode *inode = NULL; + struct dentry *root; + struct yaffs_dev *dev = 0; + char devname_buf[BDEVNAME_SIZE + 1]; + struct mtd_info *mtd; + int err; + char *data_str = (char *)data; + struct yaffs_linux_context *context = NULL; + struct yaffs_param *param; + + int read_only = 0; + int inband_tags = 0; + + struct yaffs_options options; + + unsigned mount_id; + int found; + struct yaffs_linux_context *context_iterator; + struct list_head *l; + + if (!sb) { + printk(KERN_INFO "yaffs: sb is NULL\n"); + return NULL; + } + + sb->s_magic = YAFFS_MAGIC; + sb->s_op = &yaffs_super_ops; + sb->s_xattr = yaffs_xattr_handlers; + sb->s_flags |= MS_NOATIME; + + read_only = ((sb->s_flags & MS_RDONLY) != 0); + +#ifdef YAFFS_COMPILE_EXPORTFS + sb->s_export_op = &yaffs_export_ops; +#endif + + if (!sb->s_dev) + printk(KERN_INFO "yaffs: sb->s_dev is NULL\n"); + else if (!yaffs_devname(sb, devname_buf)) + printk(KERN_INFO "yaffs: devname is NULL\n"); + else + printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n", + sb->s_dev, + yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw"); + + if (!data_str) + data_str = ""; + + printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str); + + memset(&options, 0, sizeof(options)); + + if (yaffs_parse_options(&options, data_str)) { + /* Option parsing failed */ + return NULL; + } + + sb->s_blocksize = PAGE_SIZE; + sb->s_blocksize_bits = PAGE_SHIFT; + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_read_super: Using yaffs%d", yaffs_version); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_read_super: block size %d", (int)(sb->s_blocksize)); + + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs: Attempting MTD mount of %u.%u,\"%s\"", + MAJOR(sb->s_dev), MINOR(sb->s_dev), + yaffs_devname(sb, devname_buf)); + + /* Get the device */ + mtd = get_mtd_device(NULL, MINOR(sb->s_dev)); + if (!mtd) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs: MTD device %u either not valid or unavailable", + MINOR(sb->s_dev)); + return NULL; + } + + if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2"); + yaffs_version = 2; + } + + if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) || + options.inband_tags) + inband_tags = 1; + + /* Added NCB 26/5/2006 for completeness */ + if (yaffs_version == 2 && !inband_tags + && WRITE_SIZE(mtd) == 512) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1"); + yaffs_version = 1; + } + + if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0) + return NULL; + + /* OK, so if we got here, we have an MTD that's NAND and looks + * like it has the right capabilities + * Set the struct yaffs_dev up for mtd + */ + + if (!read_only && !(mtd->flags & MTD_WRITEABLE)) { + read_only = 1; + printk(KERN_INFO + "yaffs: mtd is read only, setting superblock read only\n" + ); + sb->s_flags |= MS_RDONLY; + } + + dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL); + context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL); + + if (!dev || !context) { + if (dev) + kfree(dev); + if (context) + kfree(context); + dev = NULL; + context = NULL; + } + + if (!dev) { + /* Deep shit could not allocate device structure */ + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs_read_super: Failed trying to allocate struct yaffs_dev." + ); + return NULL; + } + memset(dev, 0, sizeof(struct yaffs_dev)); + param = &(dev->param); + + memset(context, 0, sizeof(struct yaffs_linux_context)); + dev->os_context = context; + INIT_LIST_HEAD(&(context->context_list)); + context->dev = dev; + context->super = sb; + + dev->read_only = read_only; + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) + sb->s_fs_info = dev; +#else + sb->u.generic_sbp = dev; +#endif + + + dev->driver_context = mtd; + param->name = mtd->name; + + /* Set up the memory size parameters.... */ + + + param->n_reserved_blocks = 5; + param->n_caches = (options.no_cache) ? 0 : 10; + param->inband_tags = inband_tags; + + param->enable_xattr = 1; + if (options.lazy_loading_overridden) + param->disable_lazy_load = !options.lazy_loading_enabled; + + param->defered_dir_update = 1; + + if (options.tags_ecc_overridden) + param->no_tags_ecc = !options.tags_ecc_on; + + param->empty_lost_n_found = 1; + param->refresh_period = 500; + param->disable_summary = options.disable_summary; + + +#ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING + param->disable_bad_block_marking = 1; +#endif + if (options.empty_lost_and_found_overridden) + param->empty_lost_n_found = options.empty_lost_and_found; + + /* ... and the functions. */ + if (yaffs_version == 2) { + param->is_yaffs2 = 1; +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) + param->total_bytes_per_chunk = mtd->writesize; + param->chunks_per_block = mtd->erasesize / mtd->writesize; +#else + param->total_bytes_per_chunk = mtd->oobblock; + param->chunks_per_block = mtd->erasesize / mtd->oobblock; +#endif + n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize); + + param->start_block = 0; + param->end_block = n_blocks - 1; + } else { + param->is_yaffs2 = 0; + n_blocks = YCALCBLOCKS(mtd->size, + YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK); + + param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK; + param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK; + } + + param->start_block = 0; + param->end_block = n_blocks - 1; + + yaffs_mtd_drv_install(dev); + + param->sb_dirty_fn = yaffs_set_super_dirty; + param->gc_control_fn = yaffs_gc_control_callback; + + yaffs_dev_to_lc(dev)->super = sb; + + param->use_nand_ecc = 1; + + param->skip_checkpt_rd = options.skip_checkpoint_read; + param->skip_checkpt_wr = options.skip_checkpoint_write; + + mutex_lock(&yaffs_context_lock); + /* Get a mount id */ + found = 0; + for (mount_id = 0; !found; mount_id++) { + found = 1; + list_for_each(l, &yaffs_context_list) { + context_iterator = + list_entry(l, struct yaffs_linux_context, + context_list); + if (context_iterator->mount_id == mount_id) + found = 0; + } + } + context->mount_id = mount_id; + + list_add_tail(&(yaffs_dev_to_lc(dev)->context_list), + &yaffs_context_list); + mutex_unlock(&yaffs_context_lock); + + /* Directory search handling... */ + INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts)); + param->remove_obj_fn = yaffs_remove_obj_callback; + + mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock)); + + yaffs_gross_lock(dev); + + err = yaffs_guts_initialise(dev); + + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_read_super: guts initialised %s", + (err == YAFFS_OK) ? "OK" : "FAILED"); + + if (err == YAFFS_OK) + yaffs_bg_start(dev); + + if (!context->bg_thread) + param->defered_dir_update = 0; + + sb->s_maxbytes = yaffs_max_file_size(dev); + + /* Release lock before yaffs_get_inode() */ + yaffs_gross_unlock(dev); + + /* Create root inode */ + if (err == YAFFS_OK) + inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev)); + + if (!inode) + return NULL; + + inode->i_op = &yaffs_dir_inode_operations; + inode->i_fop = &yaffs_dir_operations; + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode"); + + root = yaffs_make_root(inode); + + if (!root) + return NULL; + + sb->s_root = root; + if(!dev->is_checkpointed) + yaffs_set_super_dirty(dev); + + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs_read_super: is_checkpointed %d", + dev->is_checkpointed); + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done"); + return sb; +} + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data, + int silent) +{ + return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL; +} + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) +static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd); +} +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) +static int yaffs_read_super(struct file_system_type *fs, + int flags, const char *dev_name, + void *data, struct vfsmount *mnt) +{ + + return get_sb_bdev(fs, flags, dev_name, data, + yaffs_internal_read_super_mtd, mnt); +} +#else +static struct super_block *yaffs_read_super(struct file_system_type *fs, + int flags, const char *dev_name, + void *data) +{ + + return get_sb_bdev(fs, flags, dev_name, data, + yaffs_internal_read_super_mtd); +} +#endif + +static struct file_system_type yaffs_fs_type = { + .owner = THIS_MODULE, + .name = "yaffs", +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) + .mount = yaffs_mount, +#else + .get_sb = yaffs_read_super, +#endif + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +#else +static struct super_block *yaffs_read_super(struct super_block *sb, void *data, + int silent) +{ + return yaffs_internal_read_super(1, sb, data, silent); +} + +static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, + FS_REQUIRES_DEV); +#endif + + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data, + int silent) +{ + return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL; +} + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) +static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd); +} +#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) +static int yaffs2_read_super(struct file_system_type *fs, + int flags, const char *dev_name, void *data, + struct vfsmount *mnt) +{ + return get_sb_bdev(fs, flags, dev_name, data, + yaffs2_internal_read_super_mtd, mnt); +} +#else +static struct super_block *yaffs2_read_super(struct file_system_type *fs, + int flags, const char *dev_name, + void *data) +{ + + return get_sb_bdev(fs, flags, dev_name, data, + yaffs2_internal_read_super_mtd); +} +#endif + +static struct file_system_type yaffs2_fs_type = { + .owner = THIS_MODULE, + .name = "yaffs2", +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) + .mount = yaffs2_mount, +#else + .get_sb = yaffs2_read_super, +#endif + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +#else +static struct super_block *yaffs2_read_super(struct super_block *sb, + void *data, int silent) +{ + return yaffs_internal_read_super(2, sb, data, silent); +} + +static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, + FS_REQUIRES_DEV); +#endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)) +static struct proc_dir_entry *my_proc_entry; + +static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev) +{ + struct yaffs_param *param = &dev->param; + int bs[10]; + + yaffs_count_blocks_by_state(dev,bs); + + buf += sprintf(buf, "start_block.......... %d\n", param->start_block); + buf += sprintf(buf, "end_block............ %d\n", param->end_block); + buf += sprintf(buf, "total_bytes_per_chunk %d\n", + param->total_bytes_per_chunk); + buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc); + buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc); + buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2); + buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags); + buf += sprintf(buf, "empty_lost_n_found... %d\n", + param->empty_lost_n_found); + buf += sprintf(buf, "disable_lazy_load.... %d\n", + param->disable_lazy_load); + buf += sprintf(buf, "disable_bad_block_mrk %d\n", + param->disable_bad_block_marking); + buf += sprintf(buf, "refresh_period....... %d\n", + param->refresh_period); + buf += sprintf(buf, "n_caches............. %d\n", param->n_caches); + buf += sprintf(buf, "n_reserved_blocks.... %d\n", + param->n_reserved_blocks); + buf += sprintf(buf, "always_check_erased.. %d\n", + param->always_check_erased); + buf += sprintf(buf, "\n"); + buf += sprintf(buf, "block count by state\n"); + buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n", + bs[0], bs[1], bs[2], bs[3], bs[4]); + buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n", + bs[5], bs[6], bs[7], bs[8], bs[9]); + + return buf; +} + +static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev) +{ + buf += sprintf(buf, "max file size....... %lld\n", + (long long) yaffs_max_file_size(dev)); + buf += sprintf(buf, "data_bytes_per_chunk. %d\n", + dev->data_bytes_per_chunk); + buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits); + buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size); + buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks); + buf += sprintf(buf, "blocks_in_checkpt.... %d\n", + dev->blocks_in_checkpt); + buf += sprintf(buf, "\n"); + buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes); + buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj); + buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks); + buf += sprintf(buf, "\n"); + buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes); + buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads); + buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures); + buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies); + buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs); + buf += sprintf(buf, "passive_gc_count..... %u\n", + dev->passive_gc_count); + buf += sprintf(buf, "oldest_dirty_gc_count %u\n", + dev->oldest_dirty_gc_count); + buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks); + buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs); + buf += sprintf(buf, "n_retried_writes..... %u\n", + dev->n_retried_writes); + buf += sprintf(buf, "n_retired_blocks..... %u\n", + dev->n_retired_blocks); + buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed); + buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed); + buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n", + dev->n_tags_ecc_fixed); + buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n", + dev->n_tags_ecc_unfixed); + buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits); + buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files); + buf += sprintf(buf, "n_unlinked_files..... %u\n", + dev->n_unlinked_files); + buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count); + buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions); + buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used); + buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used); + + return buf; +} + +static int yaffs_proc_read(char *page, + char **start, + off_t offset, int count, int *eof, void *data) +{ + struct list_head *item; + char *buf = page; + int step = offset; + int n = 0; + + /* Get proc_file_read() to step 'offset' by one on each sucessive call. + * We use 'offset' (*ppos) to indicate where we are in dev_list. + * This also assumes the user has posted a read buffer large + * enough to hold the complete output; but that's life in /proc. + */ + + *(int *)start = 1; + + /* Print header first */ + if (step == 0) + buf += + sprintf(buf, "Multi-version YAFFS\n"); + else if (step == 1) + buf += sprintf(buf, "\n"); + else { + step -= 2; + + mutex_lock(&yaffs_context_lock); + + /* Locate and print the Nth entry. Order N-squared but N is small. */ + list_for_each(item, &yaffs_context_list) { + struct yaffs_linux_context *dc = + list_entry(item, struct yaffs_linux_context, + context_list); + struct yaffs_dev *dev = dc->dev; + + if (n < (step & ~1)) { + n += 2; + continue; + } + if ((step & 1) == 0) { + buf += + sprintf(buf, "\nDevice %d \"%s\"\n", n, + dev->param.name); + buf = yaffs_dump_dev_part0(buf, dev); + } else { + buf = yaffs_dump_dev_part1(buf, dev); + } + + break; + } + mutex_unlock(&yaffs_context_lock); + } + + return buf - page < count ? buf - page : count; +} + +/** + * Set the verbosity of the warnings and error messages. + * + * Note that the names can only be a..z or _ with the current code. + */ + +static struct { + char *mask_name; + unsigned mask_bitfield; +} mask_flags[] = { + {"allocate", YAFFS_TRACE_ALLOCATE}, + {"always", YAFFS_TRACE_ALWAYS}, + {"background", YAFFS_TRACE_BACKGROUND}, + {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS}, + {"buffers", YAFFS_TRACE_BUFFERS}, + {"bug", YAFFS_TRACE_BUG}, + {"checkpt", YAFFS_TRACE_CHECKPOINT}, + {"deletion", YAFFS_TRACE_DELETION}, + {"erase", YAFFS_TRACE_ERASE}, + {"error", YAFFS_TRACE_ERROR}, + {"gc_detail", YAFFS_TRACE_GC_DETAIL}, + {"gc", YAFFS_TRACE_GC}, + {"lock", YAFFS_TRACE_LOCK}, + {"mtd", YAFFS_TRACE_MTD}, + {"nandaccess", YAFFS_TRACE_NANDACCESS}, + {"os", YAFFS_TRACE_OS}, + {"scan_debug", YAFFS_TRACE_SCAN_DEBUG}, + {"scan", YAFFS_TRACE_SCAN}, + {"mount", YAFFS_TRACE_MOUNT}, + {"tracing", YAFFS_TRACE_TRACING}, + {"sync", YAFFS_TRACE_SYNC}, + {"write", YAFFS_TRACE_WRITE}, + {"verify", YAFFS_TRACE_VERIFY}, + {"verify_nand", YAFFS_TRACE_VERIFY_NAND}, + {"verify_full", YAFFS_TRACE_VERIFY_FULL}, + {"verify_all", YAFFS_TRACE_VERIFY_ALL}, + {"all", 0xffffffff}, + {"none", 0}, + {NULL, 0}, +}; + +#define MAX_MASK_NAME_LENGTH 40 +static int yaffs_proc_write_trace_options(struct file *file, const char *buf, + unsigned long count, void *data) +{ + unsigned rg = 0, mask_bitfield; + char *end; + char *mask_name; + const char *x; + char substring[MAX_MASK_NAME_LENGTH + 1]; + int i; + int done = 0; + int add, len = 0; + int pos = 0; + + rg = yaffs_trace_mask; + + while (!done && (pos < count)) { + done = 1; + while ((pos < count) && isspace(buf[pos])) + pos++; + + switch (buf[pos]) { + case '+': + case '-': + case '=': + add = buf[pos]; + pos++; + break; + + default: + add = ' '; + break; + } + mask_name = NULL; + + mask_bitfield = simple_strtoul(buf + pos, &end, 0); + + if (end > buf + pos) { + mask_name = "numeral"; + len = end - (buf + pos); + pos += len; + done = 0; + } else { + for (x = buf + pos, i = 0; + (*x == '_' || (*x >= 'a' && *x <= 'z')) && + i < MAX_MASK_NAME_LENGTH; x++, i++, pos++) + substring[i] = *x; + substring[i] = '\0'; + + for (i = 0; mask_flags[i].mask_name != NULL; i++) { + if (strcmp(substring, mask_flags[i].mask_name) + == 0) { + mask_name = mask_flags[i].mask_name; + mask_bitfield = + mask_flags[i].mask_bitfield; + done = 0; + break; + } + } + } + + if (mask_name != NULL) { + done = 0; + switch (add) { + case '-': + rg &= ~mask_bitfield; + break; + case '+': + rg |= mask_bitfield; + break; + case '=': + rg = mask_bitfield; + break; + default: + rg |= mask_bitfield; + break; + } + } + } + + yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS; + + printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask); + + if (rg & YAFFS_TRACE_ALWAYS) { + for (i = 0; mask_flags[i].mask_name != NULL; i++) { + char flag; + flag = ((rg & mask_flags[i].mask_bitfield) == + mask_flags[i].mask_bitfield) ? '+' : '-'; + printk(KERN_DEBUG "%c%s\n", flag, + mask_flags[i].mask_name); + } + } + + return count; +} + +/* Debug strings are of the form: + * .bnnn print info on block n + * .cobjn,chunkn print nand chunk id for objn:chunkn + */ + +static int yaffs_proc_debug_write(struct file *file, const char *buf, + unsigned long count, void *data) +{ + + char str[100]; + char *p0; + char *p1; + long p1_val; + long p0_val; + char cmd; + struct list_head *item; + + memset(str, 0, sizeof(str)); + memcpy(str, buf, min(count, sizeof(str) -1)); + + cmd = str[1]; + + p0 = str + 2; + + p1 = p0; + + while (*p1 && *p1 != ',') { + p1++; + } + *p1 = '\0'; + p1++; + + p0_val = simple_strtol(p0, NULL, 0); + p1_val = simple_strtol(p1, NULL, 0); + + + mutex_lock(&yaffs_context_lock); + + /* Locate and print the Nth entry. Order N-squared but N is small. */ + list_for_each(item, &yaffs_context_list) { + struct yaffs_linux_context *dc = + list_entry(item, struct yaffs_linux_context, + context_list); + struct yaffs_dev *dev = dc->dev; + + if (cmd == 'b') { + struct yaffs_block_info *bi; + + bi = yaffs_get_block_info(dev,p0_val); + + if(bi) { + printk("Block %d: state %d, retire %d, use %d, seq %d\n", + (int)p0_val, bi->block_state, + bi->needs_retiring, bi->pages_in_use, + bi->seq_number); + } + } else if (cmd == 'c') { + struct yaffs_obj *obj; + int nand_chunk; + + obj = yaffs_find_by_number(dev, p0_val); + if (!obj) + printk("No obj %d\n", (int)p0_val); + else { + if(p1_val == 0) + nand_chunk = obj->hdr_chunk; + else + nand_chunk = + yaffs_find_chunk_in_file(obj, + p1_val, NULL); + printk("Nand chunk for %d:%d is %d\n", + (int)p0_val, (int)p1_val, nand_chunk); + } + } + } + + mutex_unlock(&yaffs_context_lock); + + return count; +} + +static int yaffs_proc_write(struct file *file, const char *buf, + unsigned long count, void *data) +{ + if (buf[0] == '.') + return yaffs_proc_debug_write(file, buf, count, data); + return yaffs_proc_write_trace_options(file, buf, count, data); +} +#endif + +/* Stuff to handle installation of file systems */ +struct file_system_to_install { + struct file_system_type *fst; + int installed; +}; + +static struct file_system_to_install fs_to_install[] = { + {&yaffs_fs_type, 0}, + {&yaffs2_fs_type, 0}, + {NULL, 0} +}; + +static int __init init_yaffs_fs(void) +{ + int error = 0; + struct file_system_to_install *fsinst; + + yaffs_trace(YAFFS_TRACE_ALWAYS, "yaffs Installing."); + + mutex_init(&yaffs_context_lock); + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)) + /* Install the proc_fs entries */ + my_proc_entry = create_proc_entry("yaffs", + S_IRUGO | S_IFREG, YPROC_ROOT); + + if (my_proc_entry) { + my_proc_entry->write_proc = yaffs_proc_write; + my_proc_entry->read_proc = yaffs_proc_read; + my_proc_entry->data = NULL; + } else { + return -ENOMEM; + } +#endif + + /* Now add the file system entries */ + + fsinst = fs_to_install; + + while (fsinst->fst && !error) { + error = register_filesystem(fsinst->fst); + if (!error) + fsinst->installed = 1; + fsinst++; + } + + /* Any errors? uninstall */ + if (error) { + fsinst = fs_to_install; + + while (fsinst->fst) { + if (fsinst->installed) { + unregister_filesystem(fsinst->fst); + fsinst->installed = 0; + } + fsinst++; + } + } + + return error; +} + +static void __exit exit_yaffs_fs(void) +{ + + struct file_system_to_install *fsinst; + + yaffs_trace(YAFFS_TRACE_ALWAYS, "yaffs removing."); + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)) + remove_proc_entry("yaffs", YPROC_ROOT); +#endif + + fsinst = fs_to_install; + + while (fsinst->fst) { + if (fsinst->installed) { + unregister_filesystem(fsinst->fst); + fsinst->installed = 0; + } + fsinst++; + } +} + +module_init(init_yaffs_fs) + module_exit(exit_yaffs_fs) + + MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system"); +MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011"); +MODULE_LICENSE("GPL"); diff --git a/fs/yaffs2/yaffs_yaffs1.c b/fs/yaffs2/yaffs_yaffs1.c new file mode 100644 index 000000000000..d277e20e2a55 --- /dev/null +++ b/fs/yaffs2/yaffs_yaffs1.c @@ -0,0 +1,422 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_yaffs1.h" +#include "yportenv.h" +#include "yaffs_trace.h" +#include "yaffs_bitmap.h" +#include "yaffs_getblockinfo.h" +#include "yaffs_nand.h" +#include "yaffs_attribs.h" + +int yaffs1_scan(struct yaffs_dev *dev) +{ + struct yaffs_ext_tags tags; + int blk; + int result; + int chunk; + int c; + int deleted; + enum yaffs_block_state state; + LIST_HEAD(hard_list); + struct yaffs_block_info *bi; + u32 seq_number; + struct yaffs_obj_hdr *oh; + struct yaffs_obj *in; + struct yaffs_obj *parent; + int alloc_failed = 0; + struct yaffs_shadow_fixer *shadow_fixers = NULL; + u8 *chunk_data; + + yaffs_trace(YAFFS_TRACE_SCAN, + "yaffs1_scan starts intstartblk %d intendblk %d...", + dev->internal_start_block, dev->internal_end_block); + + chunk_data = yaffs_get_temp_buffer(dev); + + dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER; + + /* Scan all the blocks to determine their state */ + bi = dev->block_info; + for (blk = dev->internal_start_block; blk <= dev->internal_end_block; + blk++) { + yaffs_clear_chunk_bits(dev, blk); + bi->pages_in_use = 0; + bi->soft_del_pages = 0; + + yaffs_query_init_block_state(dev, blk, &state, &seq_number); + + bi->block_state = state; + bi->seq_number = seq_number; + + if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK) + bi->block_state = state = YAFFS_BLOCK_STATE_DEAD; + + yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, + "Block scanning block %d state %d seq %d", + blk, state, seq_number); + + if (state == YAFFS_BLOCK_STATE_DEAD) { + yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, + "block %d is bad", blk); + } else if (state == YAFFS_BLOCK_STATE_EMPTY) { + yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty "); + dev->n_erased_blocks++; + dev->n_free_chunks += dev->param.chunks_per_block; + } + bi++; + } + + /* For each block.... */ + for (blk = dev->internal_start_block; + !alloc_failed && blk <= dev->internal_end_block; blk++) { + + cond_resched(); + + bi = yaffs_get_block_info(dev, blk); + state = bi->block_state; + + deleted = 0; + + /* For each chunk in each block that needs scanning.... */ + for (c = 0; + !alloc_failed && c < dev->param.chunks_per_block && + state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) { + /* Read the tags and decide what to do */ + chunk = blk * dev->param.chunks_per_block + c; + + result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, + &tags); + + /* Let's have a good look at this chunk... */ + + if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED || + tags.is_deleted) { + /* YAFFS1 only... + * A deleted chunk + */ + deleted++; + dev->n_free_chunks++; + } else if (!tags.chunk_used) { + /* An unassigned chunk in the block + * This means that either the block is empty or + * this is the one being allocated from + */ + + if (c == 0) { + /* We're looking at the first chunk in + *the block so the block is unused */ + state = YAFFS_BLOCK_STATE_EMPTY; + dev->n_erased_blocks++; + } else { + /* this is the block being allocated */ + yaffs_trace(YAFFS_TRACE_SCAN, + " Allocating from %d %d", + blk, c); + state = YAFFS_BLOCK_STATE_ALLOCATING; + dev->alloc_block = blk; + dev->alloc_page = c; + dev->alloc_block_finder = blk; + + } + + dev->n_free_chunks += + (dev->param.chunks_per_block - c); + } else if (tags.chunk_id > 0) { + /* chunk_id > 0 so it is a data chunk... */ + unsigned int endpos; + + yaffs_set_chunk_bit(dev, blk, c); + bi->pages_in_use++; + + in = yaffs_find_or_create_by_number(dev, + tags.obj_id, + YAFFS_OBJECT_TYPE_FILE); + /* PutChunkIntoFile checks for a clash + * (two data chunks with the same chunk_id). + */ + + if (!in) + alloc_failed = 1; + + if (in) { + if (!yaffs_put_chunk_in_file + (in, tags.chunk_id, chunk, 1)) + alloc_failed = 1; + } + + endpos = + (tags.chunk_id - 1) * + dev->data_bytes_per_chunk + + tags.n_bytes; + if (in && + in->variant_type == + YAFFS_OBJECT_TYPE_FILE && + in->variant.file_variant.scanned_size < + endpos) { + in->variant.file_variant.scanned_size = + endpos; + if (!dev->param.use_header_file_size) { + in->variant. + file_variant.file_size = + in->variant. + file_variant.scanned_size; + } + + } + } else { + /* chunk_id == 0, so it is an ObjectHeader. + * Make the object + */ + yaffs_set_chunk_bit(dev, blk, c); + bi->pages_in_use++; + + result = yaffs_rd_chunk_tags_nand(dev, chunk, + chunk_data, + NULL); + + oh = (struct yaffs_obj_hdr *)chunk_data; + + in = yaffs_find_by_number(dev, tags.obj_id); + if (in && in->variant_type != oh->type) { + /* This should not happen, but somehow + * Wev'e ended up with an obj_id that + * has been reused but not yet deleted, + * and worse still it has changed type. + * Delete the old object. + */ + + yaffs_del_obj(in); + in = NULL; + } + + in = yaffs_find_or_create_by_number(dev, + tags.obj_id, + oh->type); + + if (!in) + alloc_failed = 1; + + if (in && oh->shadows_obj > 0) { + + struct yaffs_shadow_fixer *fixer; + fixer = + kmalloc(sizeof + (struct yaffs_shadow_fixer), + GFP_NOFS); + if (fixer) { + fixer->next = shadow_fixers; + shadow_fixers = fixer; + fixer->obj_id = tags.obj_id; + fixer->shadowed_id = + oh->shadows_obj; + yaffs_trace(YAFFS_TRACE_SCAN, + " Shadow fixer: %d shadows %d", + fixer->obj_id, + fixer->shadowed_id); + + } + + } + + if (in && in->valid) { + /* We have already filled this one. + * We have a duplicate and need to + * resolve it. */ + + unsigned existing_serial = in->serial; + unsigned new_serial = + tags.serial_number; + + if (((existing_serial + 1) & 3) == + new_serial) { + /* Use new one - destroy the + * exisiting one */ + yaffs_chunk_del(dev, + in->hdr_chunk, + 1, __LINE__); + in->valid = 0; + } else { + /* Use existing - destroy + * this one. */ + yaffs_chunk_del(dev, chunk, 1, + __LINE__); + } + } + + if (in && !in->valid && + (tags.obj_id == YAFFS_OBJECTID_ROOT || + tags.obj_id == + YAFFS_OBJECTID_LOSTNFOUND)) { + /* We only load some info, don't fiddle + * with directory structure */ + in->valid = 1; + in->variant_type = oh->type; + + in->yst_mode = oh->yst_mode; + yaffs_load_attribs(in, oh); + in->hdr_chunk = chunk; + in->serial = tags.serial_number; + + } else if (in && !in->valid) { + /* we need to load this info */ + + in->valid = 1; + in->variant_type = oh->type; + + in->yst_mode = oh->yst_mode; + yaffs_load_attribs(in, oh); + in->hdr_chunk = chunk; + in->serial = tags.serial_number; + + yaffs_set_obj_name_from_oh(in, oh); + in->dirty = 0; + + /* directory stuff... + * hook up to parent + */ + + parent = + yaffs_find_or_create_by_number + (dev, oh->parent_obj_id, + YAFFS_OBJECT_TYPE_DIRECTORY); + if (!parent) + alloc_failed = 1; + if (parent && parent->variant_type == + YAFFS_OBJECT_TYPE_UNKNOWN) { + /* Set up as a directory */ + parent->variant_type = + YAFFS_OBJECT_TYPE_DIRECTORY; + INIT_LIST_HEAD(&parent-> + variant.dir_variant. + children); + } else if (!parent || + parent->variant_type != + YAFFS_OBJECT_TYPE_DIRECTORY) { + /* Hoosterman, a problem.... + * We're trying to use a + * non-directory as a directory + */ + + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." + ); + parent = dev->lost_n_found; + } + + yaffs_add_obj_to_dir(parent, in); + + switch (in->variant_type) { + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* Todo got a problem */ + break; + case YAFFS_OBJECT_TYPE_FILE: + if (dev->param. + use_header_file_size) + in->variant. + file_variant.file_size + = yaffs_oh_to_size(oh); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant. + hardlink_variant.equiv_id = + oh->equiv_id; + list_add(&in->hard_links, + &hard_list); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + in->variant.symlink_variant. + alias = + yaffs_clone_str(oh->alias); + if (!in->variant. + symlink_variant.alias) + alloc_failed = 1; + break; + } + } + } + } + + if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) { + /* If we got this far while scanning, + * then the block is fully allocated. */ + state = YAFFS_BLOCK_STATE_FULL; + } + + if (state == YAFFS_BLOCK_STATE_ALLOCATING) { + /* If the block was partially allocated then + * treat it as fully allocated. */ + state = YAFFS_BLOCK_STATE_FULL; + dev->alloc_block = -1; + } + + bi->block_state = state; + + /* Now let's see if it was dirty */ + if (bi->pages_in_use == 0 && + !bi->has_shrink_hdr && + bi->block_state == YAFFS_BLOCK_STATE_FULL) + yaffs_block_became_dirty(dev, blk); + } + + /* Ok, we've done all the scanning. + * Fix up the hard link chains. + * We should now have scanned all the objects, now it's time to add + * these hardlinks. + */ + + yaffs_link_fixup(dev, &hard_list); + + /* + * Fix up any shadowed objects. + * There should not be more than one of these. + */ + { + struct yaffs_shadow_fixer *fixer; + struct yaffs_obj *obj; + + while (shadow_fixers) { + fixer = shadow_fixers; + shadow_fixers = fixer->next; + /* Complete the rename transaction by deleting the + * shadowed object then setting the object header + to unshadowed. + */ + obj = yaffs_find_by_number(dev, fixer->shadowed_id); + if (obj) + yaffs_del_obj(obj); + + obj = yaffs_find_by_number(dev, fixer->obj_id); + + if (obj) + yaffs_update_oh(obj, NULL, 1, 0, 0, NULL); + + kfree(fixer); + } + } + + yaffs_release_temp_buffer(dev, chunk_data); + + if (alloc_failed) + return YAFFS_FAIL; + + yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends"); + + return YAFFS_OK; +} diff --git a/fs/yaffs2/yaffs_yaffs1.h b/fs/yaffs2/yaffs_yaffs1.h new file mode 100644 index 000000000000..97e2fdd08a5d --- /dev/null +++ b/fs/yaffs2/yaffs_yaffs1.h @@ -0,0 +1,22 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_YAFFS1_H__ +#define __YAFFS_YAFFS1_H__ + +#include "yaffs_guts.h" +int yaffs1_scan(struct yaffs_dev *dev); + +#endif diff --git a/fs/yaffs2/yaffs_yaffs2.c b/fs/yaffs2/yaffs_yaffs2.c new file mode 100644 index 000000000000..f1dc972276f7 --- /dev/null +++ b/fs/yaffs2/yaffs_yaffs2.c @@ -0,0 +1,1532 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "yaffs_guts.h" +#include "yaffs_trace.h" +#include "yaffs_yaffs2.h" +#include "yaffs_checkptrw.h" +#include "yaffs_bitmap.h" +#include "yaffs_nand.h" +#include "yaffs_getblockinfo.h" +#include "yaffs_verify.h" +#include "yaffs_attribs.h" +#include "yaffs_summary.h" + +/* + * Checkpoints are really no benefit on very small partitions. + * + * To save space on small partitions don't bother with checkpoints unless + * the partition is at least this big. + */ +#define YAFFS_CHECKPOINT_MIN_BLOCKS 60 +#define YAFFS_SMALL_HOLE_THRESHOLD 4 + +/* + * Oldest Dirty Sequence Number handling. + */ + +/* yaffs_calc_oldest_dirty_seq() + * yaffs2_find_oldest_dirty_seq() + * Calculate the oldest dirty sequence number if we don't know it. + */ +void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev) +{ + int i; + unsigned seq; + unsigned block_no = 0; + struct yaffs_block_info *b; + + if (!dev->param.is_yaffs2) + return; + + /* Find the oldest dirty sequence number. */ + seq = dev->seq_number + 1; + b = dev->block_info; + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + if (b->block_state == YAFFS_BLOCK_STATE_FULL && + (b->pages_in_use - b->soft_del_pages) < + dev->param.chunks_per_block && + b->seq_number < seq) { + seq = b->seq_number; + block_no = i; + } + b++; + } + + if (block_no) { + dev->oldest_dirty_seq = seq; + dev->oldest_dirty_block = block_no; + } +} + +void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev) +{ + if (!dev->param.is_yaffs2) + return; + + if (!dev->oldest_dirty_seq) + yaffs_calc_oldest_dirty_seq(dev); +} + +/* + * yaffs_clear_oldest_dirty_seq() + * Called when a block is erased or marked bad. (ie. when its seq_number + * becomes invalid). If the value matches the oldest then we clear + * dev->oldest_dirty_seq to force its recomputation. + */ +void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev, + struct yaffs_block_info *bi) +{ + + if (!dev->param.is_yaffs2) + return; + + if (!bi || bi->seq_number == dev->oldest_dirty_seq) { + dev->oldest_dirty_seq = 0; + dev->oldest_dirty_block = 0; + } +} + +/* + * yaffs2_update_oldest_dirty_seq() + * Update the oldest dirty sequence number whenever we dirty a block. + * Only do this if the oldest_dirty_seq is actually being tracked. + */ +void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no, + struct yaffs_block_info *bi) +{ + if (!dev->param.is_yaffs2) + return; + + if (dev->oldest_dirty_seq) { + if (dev->oldest_dirty_seq > bi->seq_number) { + dev->oldest_dirty_seq = bi->seq_number; + dev->oldest_dirty_block = block_no; + } + } +} + +int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi) +{ + + if (!dev->param.is_yaffs2) + return 1; /* disqualification only applies to yaffs2. */ + + if (!bi->has_shrink_hdr) + return 1; /* can gc */ + + yaffs2_find_oldest_dirty_seq(dev); + + /* Can't do gc of this block if there are any blocks older than this + * one that have discarded pages. + */ + return (bi->seq_number <= dev->oldest_dirty_seq); +} + +/* + * yaffs2_find_refresh_block() + * periodically finds the oldest full block by sequence number for refreshing. + * Only for yaffs2. + */ +u32 yaffs2_find_refresh_block(struct yaffs_dev *dev) +{ + u32 b; + u32 oldest = 0; + u32 oldest_seq = 0; + struct yaffs_block_info *bi; + + if (!dev->param.is_yaffs2) + return oldest; + + /* + * If refresh period < 10 then refreshing is disabled. + */ + if (dev->param.refresh_period < 10) + return oldest; + + /* + * Fix broken values. + */ + if (dev->refresh_skip > dev->param.refresh_period) + dev->refresh_skip = dev->param.refresh_period; + + if (dev->refresh_skip > 0) + return oldest; + + /* + * Refresh skip is now zero. + * We'll do a refresh this time around.... + * Update the refresh skip and find the oldest block. + */ + dev->refresh_skip = dev->param.refresh_period; + dev->refresh_count++; + bi = dev->block_info; + for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) { + + if (bi->block_state == YAFFS_BLOCK_STATE_FULL) { + + if (oldest < 1 || bi->seq_number < oldest_seq) { + oldest = b; + oldest_seq = bi->seq_number; + } + } + bi++; + } + + if (oldest > 0) { + yaffs_trace(YAFFS_TRACE_GC, + "GC refresh count %d selected block %d with seq_number %d", + dev->refresh_count, oldest, oldest_seq); + } + + return oldest; +} + +int yaffs2_checkpt_required(struct yaffs_dev *dev) +{ + int nblocks; + + if (!dev->param.is_yaffs2) + return 0; + + nblocks = dev->internal_end_block - dev->internal_start_block + 1; + + return !dev->param.skip_checkpt_wr && + !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS); +} + +int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev) +{ + int retval; + int n_bytes = 0; + int n_blocks; + int dev_blocks; + + if (!dev->param.is_yaffs2) + return 0; + + if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) { + /* Not a valid value so recalculate */ + dev_blocks = dev->param.end_block - dev->param.start_block + 1; + n_bytes += sizeof(struct yaffs_checkpt_validity); + n_bytes += sizeof(struct yaffs_checkpt_dev); + n_bytes += dev_blocks * sizeof(struct yaffs_block_info); + n_bytes += dev_blocks * dev->chunk_bit_stride; + n_bytes += + (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) * + dev->n_obj; + n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes; + n_bytes += sizeof(struct yaffs_checkpt_validity); + n_bytes += sizeof(u32); /* checksum */ + + /* Round up and add 2 blocks to allow for some bad blocks, + * so add 3 */ + + n_blocks = + (n_bytes / + (dev->data_bytes_per_chunk * + dev->param.chunks_per_block)) + 3; + + dev->checkpoint_blocks_required = n_blocks; + } + + retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt; + if (retval < 0) + retval = 0; + return retval; +} + +/*--------------------- Checkpointing --------------------*/ + +static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head) +{ + struct yaffs_checkpt_validity cp; + + memset(&cp, 0, sizeof(cp)); + + cp.struct_type = sizeof(cp); + cp.magic = YAFFS_MAGIC; + cp.version = YAFFS_CHECKPOINT_VERSION; + cp.head = (head) ? 1 : 0; + + return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0; +} + +static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head) +{ + struct yaffs_checkpt_validity cp; + int ok; + + ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp)); + + if (ok) + ok = (cp.struct_type == sizeof(cp)) && + (cp.magic == YAFFS_MAGIC) && + (cp.version == YAFFS_CHECKPOINT_VERSION) && + (cp.head == ((head) ? 1 : 0)); + return ok ? 1 : 0; +} + +static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp, + struct yaffs_dev *dev) +{ + cp->n_erased_blocks = dev->n_erased_blocks; + cp->alloc_block = dev->alloc_block; + cp->alloc_page = dev->alloc_page; + cp->n_free_chunks = dev->n_free_chunks; + + cp->n_deleted_files = dev->n_deleted_files; + cp->n_unlinked_files = dev->n_unlinked_files; + cp->n_bg_deletions = dev->n_bg_deletions; + cp->seq_number = dev->seq_number; + +} + +static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev, + struct yaffs_checkpt_dev *cp) +{ + dev->n_erased_blocks = cp->n_erased_blocks; + dev->alloc_block = cp->alloc_block; + dev->alloc_page = cp->alloc_page; + dev->n_free_chunks = cp->n_free_chunks; + + dev->n_deleted_files = cp->n_deleted_files; + dev->n_unlinked_files = cp->n_unlinked_files; + dev->n_bg_deletions = cp->n_bg_deletions; + dev->seq_number = cp->seq_number; +} + +static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev) +{ + struct yaffs_checkpt_dev cp; + u32 n_bytes; + u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1; + int ok; + + /* Write device runtime values */ + yaffs2_dev_to_checkpt_dev(&cp, dev); + cp.struct_type = sizeof(cp); + + ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)); + if (!ok) + return 0; + + /* Write block info */ + n_bytes = n_blocks * sizeof(struct yaffs_block_info); + ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes); + if (!ok) + return 0; + + /* Write chunk bits */ + n_bytes = n_blocks * dev->chunk_bit_stride; + ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == n_bytes); + + return ok ? 1 : 0; +} + +static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev) +{ + struct yaffs_checkpt_dev cp; + u32 n_bytes; + u32 n_blocks = + (dev->internal_end_block - dev->internal_start_block + 1); + int ok; + + ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp)); + if (!ok) + return 0; + + if (cp.struct_type != sizeof(cp)) + return 0; + + yaffs_checkpt_dev_to_dev(dev, &cp); + + n_bytes = n_blocks * sizeof(struct yaffs_block_info); + + ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes); + + if (!ok) + return 0; + + n_bytes = n_blocks * dev->chunk_bit_stride; + + ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes); + + return ok ? 1 : 0; +} + +static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp, + struct yaffs_obj *obj) +{ + cp->obj_id = obj->obj_id; + cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0; + cp->hdr_chunk = obj->hdr_chunk; + cp->variant_type = obj->variant_type; + cp->deleted = obj->deleted; + cp->soft_del = obj->soft_del; + cp->unlinked = obj->unlinked; + cp->fake = obj->fake; + cp->rename_allowed = obj->rename_allowed; + cp->unlink_allowed = obj->unlink_allowed; + cp->serial = obj->serial; + cp->n_data_chunks = obj->n_data_chunks; + + if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) + cp->size_or_equiv_obj = obj->variant.file_variant.file_size; + else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) + cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id; +} + +static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj, + struct yaffs_checkpt_obj *cp) +{ + struct yaffs_obj *parent; + + if (obj->variant_type != cp->variant_type) { + yaffs_trace(YAFFS_TRACE_ERROR, + "Checkpoint read object %d type %d chunk %d does not match existing object type %d", + cp->obj_id, cp->variant_type, cp->hdr_chunk, + obj->variant_type); + return 0; + } + + obj->obj_id = cp->obj_id; + + if (cp->parent_id) + parent = yaffs_find_or_create_by_number(obj->my_dev, + cp->parent_id, + YAFFS_OBJECT_TYPE_DIRECTORY); + else + parent = NULL; + + if (parent) { + if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_trace(YAFFS_TRACE_ALWAYS, + "Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory", + cp->obj_id, cp->parent_id, + cp->variant_type, cp->hdr_chunk, + parent->variant_type); + return 0; + } + yaffs_add_obj_to_dir(parent, obj); + } + + obj->hdr_chunk = cp->hdr_chunk; + obj->variant_type = cp->variant_type; + obj->deleted = cp->deleted; + obj->soft_del = cp->soft_del; + obj->unlinked = cp->unlinked; + obj->fake = cp->fake; + obj->rename_allowed = cp->rename_allowed; + obj->unlink_allowed = cp->unlink_allowed; + obj->serial = cp->serial; + obj->n_data_chunks = cp->n_data_chunks; + + if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) + obj->variant.file_variant.file_size = cp->size_or_equiv_obj; + else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) + obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj; + + if (obj->hdr_chunk > 0) + obj->lazy_loaded = 1; + return 1; +} + +static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in, + struct yaffs_tnode *tn, u32 level, + int chunk_offset) +{ + int i; + struct yaffs_dev *dev = in->my_dev; + int ok = 1; + u32 base_offset; + + if (!tn) + return 1; + + if (level > 0) { + for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) { + if (!tn->internal[i]) + continue; + ok = yaffs2_checkpt_tnode_worker(in, + tn->internal[i], + level - 1, + (chunk_offset << + YAFFS_TNODES_INTERNAL_BITS) + i); + } + return ok; + } + + /* Level 0 tnode */ + base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS; + ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) == + sizeof(base_offset)); + if (ok) + ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) == + dev->tnode_size); + + return ok; +} + +static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj) +{ + u32 end_marker = ~0; + int ok = 1; + + if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE) + return ok; + + ok = yaffs2_checkpt_tnode_worker(obj, + obj->variant.file_variant.top, + obj->variant.file_variant. + top_level, 0); + if (ok) + ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker, + sizeof(end_marker)) == sizeof(end_marker)); + + return ok ? 1 : 0; +} + +static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj) +{ + u32 base_chunk; + int ok = 1; + struct yaffs_dev *dev = obj->my_dev; + struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant; + struct yaffs_tnode *tn; + int nread = 0; + + ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) == + sizeof(base_chunk)); + + while (ok && (~base_chunk)) { + nread++; + /* Read level 0 tnode */ + + tn = yaffs_get_tnode(dev); + if (tn) + ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) == + dev->tnode_size); + else + ok = 0; + + if (tn && ok) + ok = yaffs_add_find_tnode_0(dev, + file_stuct_ptr, + base_chunk, tn) ? 1 : 0; + + if (ok) + ok = (yaffs2_checkpt_rd + (dev, &base_chunk, + sizeof(base_chunk)) == sizeof(base_chunk)); + } + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "Checkpoint read tnodes %d records, last %d. ok %d", + nread, base_chunk, ok); + + return ok ? 1 : 0; +} + +static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev) +{ + struct yaffs_obj *obj; + struct yaffs_checkpt_obj cp; + int i; + int ok = 1; + struct list_head *lh; + + /* Iterate through the objects in each hash entry, + * dumping them to the checkpointing stream. + */ + + for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) { + list_for_each(lh, &dev->obj_bucket[i].list) { + obj = list_entry(lh, struct yaffs_obj, hash_link); + if (!obj->defered_free) { + yaffs2_obj_checkpt_obj(&cp, obj); + cp.struct_type = sizeof(cp); + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "Checkpoint write object %d parent %d type %d chunk %d obj addr %p", + cp.obj_id, cp.parent_id, + cp.variant_type, cp.hdr_chunk, obj); + + ok = (yaffs2_checkpt_wr(dev, &cp, + sizeof(cp)) == sizeof(cp)); + + if (ok && + obj->variant_type == + YAFFS_OBJECT_TYPE_FILE) + ok = yaffs2_wr_checkpt_tnodes(obj); + } + } + } + + /* Dump end of list */ + memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj)); + cp.struct_type = sizeof(cp); + + if (ok) + ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)); + + return ok ? 1 : 0; +} + +static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev) +{ + struct yaffs_obj *obj; + struct yaffs_checkpt_obj cp; + int ok = 1; + int done = 0; + LIST_HEAD(hard_list); + + + while (ok && !done) { + ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp)); + if (cp.struct_type != sizeof(cp)) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "struct size %d instead of %d ok %d", + cp.struct_type, (int)sizeof(cp), ok); + ok = 0; + } + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "Checkpoint read object %d parent %d type %d chunk %d ", + cp.obj_id, cp.parent_id, cp.variant_type, + cp.hdr_chunk); + + if (ok && cp.obj_id == ~0) { + done = 1; + } else if (ok) { + obj = + yaffs_find_or_create_by_number(dev, cp.obj_id, + cp.variant_type); + if (obj) { + ok = yaffs2_checkpt_obj_to_obj(obj, &cp); + if (!ok) + break; + if (obj->variant_type == + YAFFS_OBJECT_TYPE_FILE) { + ok = yaffs2_rd_checkpt_tnodes(obj); + } else if (obj->variant_type == + YAFFS_OBJECT_TYPE_HARDLINK) { + list_add(&obj->hard_links, &hard_list); + } + } else { + ok = 0; + } + } + } + + if (ok) + yaffs_link_fixup(dev, &hard_list); + + return ok ? 1 : 0; +} + +static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev) +{ + u32 checkpt_sum; + int ok; + + yaffs2_get_checkpt_sum(dev, &checkpt_sum); + + ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) == + sizeof(checkpt_sum)); + + if (!ok) + return 0; + + return 1; +} + +static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev) +{ + u32 checkpt_sum0; + u32 checkpt_sum1; + int ok; + + yaffs2_get_checkpt_sum(dev, &checkpt_sum0); + + ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) == + sizeof(checkpt_sum1)); + + if (!ok) + return 0; + + if (checkpt_sum0 != checkpt_sum1) + return 0; + + return 1; +} + +static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev) +{ + int ok = 1; + + if (!yaffs2_checkpt_required(dev)) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "skipping checkpoint write"); + ok = 0; + } + + if (ok) + ok = yaffs2_checkpt_open(dev, 1); + + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "write checkpoint validity"); + ok = yaffs2_wr_checkpt_validity_marker(dev, 1); + } + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "write checkpoint device"); + ok = yaffs2_wr_checkpt_dev(dev); + } + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "write checkpoint objects"); + ok = yaffs2_wr_checkpt_objs(dev); + } + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "write checkpoint validity"); + ok = yaffs2_wr_checkpt_validity_marker(dev, 0); + } + + if (ok) + ok = yaffs2_wr_checkpt_sum(dev); + + if (!yaffs_checkpt_close(dev)) + ok = 0; + + if (ok) + dev->is_checkpointed = 1; + else + dev->is_checkpointed = 0; + + return dev->is_checkpointed; +} + +static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev) +{ + int ok = 1; + + if (!dev->param.is_yaffs2) + ok = 0; + + if (ok && dev->param.skip_checkpt_rd) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "skipping checkpoint read"); + ok = 0; + } + + if (ok) + ok = yaffs2_checkpt_open(dev, 0); /* open for read */ + + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "read checkpoint validity"); + ok = yaffs2_rd_checkpt_validity_marker(dev, 1); + } + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "read checkpoint device"); + ok = yaffs2_rd_checkpt_dev(dev); + } + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "read checkpoint objects"); + ok = yaffs2_rd_checkpt_objs(dev); + } + if (ok) { + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "read checkpoint validity"); + ok = yaffs2_rd_checkpt_validity_marker(dev, 0); + } + + if (ok) { + ok = yaffs2_rd_checkpt_sum(dev); + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "read checkpoint checksum %d", ok); + } + + if (!yaffs_checkpt_close(dev)) + ok = 0; + + if (ok) + dev->is_checkpointed = 1; + else + dev->is_checkpointed = 0; + + return ok ? 1 : 0; +} + +void yaffs2_checkpt_invalidate(struct yaffs_dev *dev) +{ + if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) { + dev->is_checkpointed = 0; + yaffs2_checkpt_invalidate_stream(dev); + } + if (dev->param.sb_dirty_fn) + dev->param.sb_dirty_fn(dev); +} + +int yaffs_checkpoint_save(struct yaffs_dev *dev) +{ + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "save entry: is_checkpointed %d", + dev->is_checkpointed); + + yaffs_verify_objects(dev); + yaffs_verify_blocks(dev); + yaffs_verify_free_chunks(dev); + + if (!dev->is_checkpointed) { + yaffs2_checkpt_invalidate(dev); + yaffs2_wr_checkpt_data(dev); + } + + yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT, + "save exit: is_checkpointed %d", + dev->is_checkpointed); + + return dev->is_checkpointed; +} + +int yaffs2_checkpt_restore(struct yaffs_dev *dev) +{ + int retval; + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "restore entry: is_checkpointed %d", + dev->is_checkpointed); + + retval = yaffs2_rd_checkpt_data(dev); + + if (dev->is_checkpointed) { + yaffs_verify_objects(dev); + yaffs_verify_blocks(dev); + yaffs_verify_free_chunks(dev); + } + + yaffs_trace(YAFFS_TRACE_CHECKPOINT, + "restore exit: is_checkpointed %d", + dev->is_checkpointed); + + return retval; +} + +int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size) +{ + /* if new_size > old_file_size. + * We're going to be writing a hole. + * If the hole is small then write zeros otherwise write a start + * of hole marker. + */ + loff_t old_file_size; + loff_t increase; + int small_hole; + int result = YAFFS_OK; + struct yaffs_dev *dev = NULL; + u8 *local_buffer = NULL; + int small_increase_ok = 0; + + if (!obj) + return YAFFS_FAIL; + + if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE) + return YAFFS_FAIL; + + dev = obj->my_dev; + + /* Bail out if not yaffs2 mode */ + if (!dev->param.is_yaffs2) + return YAFFS_OK; + + old_file_size = obj->variant.file_variant.file_size; + + if (new_size <= old_file_size) + return YAFFS_OK; + + increase = new_size - old_file_size; + + if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk && + yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1)) + small_hole = 1; + else + small_hole = 0; + + if (small_hole) + local_buffer = yaffs_get_temp_buffer(dev); + + if (local_buffer) { + /* fill hole with zero bytes */ + loff_t pos = old_file_size; + int this_write; + int written; + memset(local_buffer, 0, dev->data_bytes_per_chunk); + small_increase_ok = 1; + + while (increase > 0 && small_increase_ok) { + this_write = increase; + if (this_write > dev->data_bytes_per_chunk) + this_write = dev->data_bytes_per_chunk; + written = + yaffs_do_file_wr(obj, local_buffer, pos, this_write, + 0); + if (written == this_write) { + pos += this_write; + increase -= this_write; + } else { + small_increase_ok = 0; + } + } + + yaffs_release_temp_buffer(dev, local_buffer); + + /* If out of space then reverse any chunks we've added */ + if (!small_increase_ok) + yaffs_resize_file_down(obj, old_file_size); + } + + if (!small_increase_ok && + obj->parent && + obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED && + obj->parent->obj_id != YAFFS_OBJECTID_DELETED) { + /* Write a hole start header with the old file size */ + yaffs_update_oh(obj, NULL, 0, 1, 0, NULL); + } + + return result; +} + +struct yaffs_block_index { + int seq; + int block; +}; + +static int yaffs2_ybicmp(const void *a, const void *b) +{ + int aseq = ((struct yaffs_block_index *)a)->seq; + int bseq = ((struct yaffs_block_index *)b)->seq; + int ablock = ((struct yaffs_block_index *)a)->block; + int bblock = ((struct yaffs_block_index *)b)->block; + + if (aseq == bseq) + return ablock - bblock; + + return aseq - bseq; +} + +static inline int yaffs2_scan_chunk(struct yaffs_dev *dev, + struct yaffs_block_info *bi, + int blk, int chunk_in_block, + int *found_chunks, + u8 *chunk_data, + struct list_head *hard_list, + int summary_available) +{ + struct yaffs_obj_hdr *oh; + struct yaffs_obj *in; + struct yaffs_obj *parent; + int equiv_id; + loff_t file_size; + int is_shrink; + int is_unlinked; + struct yaffs_ext_tags tags; + int result; + int alloc_failed = 0; + int chunk = blk * dev->param.chunks_per_block + chunk_in_block; + struct yaffs_file_var *file_var; + struct yaffs_hardlink_var *hl_var; + struct yaffs_symlink_var *sl_var; + + if (summary_available) { + result = yaffs_summary_fetch(dev, &tags, chunk_in_block); + tags.seq_number = bi->seq_number; + } + + if (!summary_available || tags.obj_id == 0) { + result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags); + dev->tags_used++; + } else { + dev->summary_used++; + } + + /* Let's have a good look at this chunk... */ + + if (!tags.chunk_used) { + /* An unassigned chunk in the block. + * If there are used chunks after this one, then + * it is a chunk that was skipped due to failing + * the erased check. Just skip it so that it can + * be deleted. + * But, more typically, We get here when this is + * an unallocated chunk and his means that + * either the block is empty or this is the one + * being allocated from + */ + + if (*found_chunks) { + /* This is a chunk that was skipped due + * to failing the erased check */ + } else if (chunk_in_block == 0) { + /* We're looking at the first chunk in + * the block so the block is unused */ + bi->block_state = YAFFS_BLOCK_STATE_EMPTY; + dev->n_erased_blocks++; + } else { + if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN || + bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) { + if (dev->seq_number == bi->seq_number) { + /* Allocating from this block*/ + yaffs_trace(YAFFS_TRACE_SCAN, + " Allocating from %d %d", + blk, chunk_in_block); + + bi->block_state = + YAFFS_BLOCK_STATE_ALLOCATING; + dev->alloc_block = blk; + dev->alloc_page = chunk_in_block; + dev->alloc_block_finder = blk; + } else { + /* This is a partially written block + * that is not the current + * allocation block. + */ + yaffs_trace(YAFFS_TRACE_SCAN, + "Partially written block %d detected. gc will fix this.", + blk); + } + } + } + + dev->n_free_chunks++; + + } else if (tags.ecc_result == + YAFFS_ECC_RESULT_UNFIXED) { + yaffs_trace(YAFFS_TRACE_SCAN, + " Unfixed ECC in chunk(%d:%d), chunk ignored", + blk, chunk_in_block); + dev->n_free_chunks++; + } else if (tags.obj_id > YAFFS_MAX_OBJECT_ID || + tags.chunk_id > YAFFS_MAX_CHUNK_ID || + tags.obj_id == YAFFS_OBJECTID_SUMMARY || + (tags.chunk_id > 0 && + tags.n_bytes > dev->data_bytes_per_chunk) || + tags.seq_number != bi->seq_number) { + yaffs_trace(YAFFS_TRACE_SCAN, + "Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored", + blk, chunk_in_block, tags.obj_id, + tags.chunk_id, tags.n_bytes); + dev->n_free_chunks++; + } else if (tags.chunk_id > 0) { + /* chunk_id > 0 so it is a data chunk... */ + loff_t endpos; + loff_t chunk_base = (tags.chunk_id - 1) * + dev->data_bytes_per_chunk; + + *found_chunks = 1; + + yaffs_set_chunk_bit(dev, blk, chunk_in_block); + bi->pages_in_use++; + + in = yaffs_find_or_create_by_number(dev, + tags.obj_id, + YAFFS_OBJECT_TYPE_FILE); + if (!in) + /* Out of memory */ + alloc_failed = 1; + + if (in && + in->variant_type == YAFFS_OBJECT_TYPE_FILE && + chunk_base < in->variant.file_variant.shrink_size) { + /* This has not been invalidated by + * a resize */ + if (!yaffs_put_chunk_in_file(in, tags.chunk_id, + chunk, -1)) + alloc_failed = 1; + + /* File size is calculated by looking at + * the data chunks if we have not + * seen an object header yet. + * Stop this practice once we find an + * object header. + */ + endpos = chunk_base + tags.n_bytes; + + if (!in->valid && + in->variant.file_variant.scanned_size < endpos) { + in->variant.file_variant. + scanned_size = endpos; + in->variant.file_variant. + file_size = endpos; + } + } else if (in) { + /* This chunk has been invalidated by a + * resize, or a past file deletion + * so delete the chunk*/ + yaffs_chunk_del(dev, chunk, 1, __LINE__); + } + } else { + /* chunk_id == 0, so it is an ObjectHeader. + * Thus, we read in the object header and make + * the object + */ + *found_chunks = 1; + + yaffs_set_chunk_bit(dev, blk, chunk_in_block); + bi->pages_in_use++; + + oh = NULL; + in = NULL; + + if (tags.extra_available) { + in = yaffs_find_or_create_by_number(dev, + tags.obj_id, + tags.extra_obj_type); + if (!in) + alloc_failed = 1; + } + + if (!in || + (!in->valid && dev->param.disable_lazy_load) || + tags.extra_shadows || + (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT || + tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND))) { + + /* If we don't have valid info then we + * need to read the chunk + * TODO In future we can probably defer + * reading the chunk and living with + * invalid data until needed. + */ + + result = yaffs_rd_chunk_tags_nand(dev, + chunk, + chunk_data, + NULL); + + oh = (struct yaffs_obj_hdr *)chunk_data; + + if (dev->param.inband_tags) { + /* Fix up the header if they got + * corrupted by inband tags */ + oh->shadows_obj = + oh->inband_shadowed_obj_id; + oh->is_shrink = + oh->inband_is_shrink; + } + + if (!in) { + in = yaffs_find_or_create_by_number(dev, + tags.obj_id, oh->type); + if (!in) + alloc_failed = 1; + } + } + + if (!in) { + /* TODO Hoosterman we have a problem! */ + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy: Could not make object for object %d at chunk %d during scan", + tags.obj_id, chunk); + return YAFFS_FAIL; + } + + if (in->valid) { + /* We have already filled this one. + * We have a duplicate that will be + * discarded, but we first have to suck + * out resize info if it is a file. + */ + if ((in->variant_type == YAFFS_OBJECT_TYPE_FILE) && + ((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) || + (tags.extra_available && + tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE) + )) { + loff_t this_size = (oh) ? + yaffs_oh_to_size(oh) : + tags.extra_file_size; + u32 parent_obj_id = (oh) ? + oh->parent_obj_id : + tags.extra_parent_id; + + is_shrink = (oh) ? + oh->is_shrink : + tags.extra_is_shrink; + + /* If it is deleted (unlinked + * at start also means deleted) + * we treat the file size as + * being zeroed at this point. + */ + if (parent_obj_id == YAFFS_OBJECTID_DELETED || + parent_obj_id == YAFFS_OBJECTID_UNLINKED) { + this_size = 0; + is_shrink = 1; + } + + if (is_shrink && + in->variant.file_variant.shrink_size > + this_size) + in->variant.file_variant.shrink_size = + this_size; + + if (is_shrink) + bi->has_shrink_hdr = 1; + } + /* Use existing - destroy this one. */ + yaffs_chunk_del(dev, chunk, 1, __LINE__); + } + + if (!in->valid && in->variant_type != + (oh ? oh->type : tags.extra_obj_type)) + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy: Bad object type, %d != %d, for object %d at chunk %d during scan", + oh ? oh->type : tags.extra_obj_type, + in->variant_type, tags.obj_id, + chunk); + + if (!in->valid && + (tags.obj_id == YAFFS_OBJECTID_ROOT || + tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) { + /* We only load some info, don't fiddle + * with directory structure */ + in->valid = 1; + + if (oh) { + in->yst_mode = oh->yst_mode; + yaffs_load_attribs(in, oh); + in->lazy_loaded = 0; + } else { + in->lazy_loaded = 1; + } + in->hdr_chunk = chunk; + + } else if (!in->valid) { + /* we need to load this info */ + in->valid = 1; + in->hdr_chunk = chunk; + if (oh) { + in->variant_type = oh->type; + in->yst_mode = oh->yst_mode; + yaffs_load_attribs(in, oh); + + if (oh->shadows_obj > 0) + yaffs_handle_shadowed_obj(dev, + oh->shadows_obj, 1); + + yaffs_set_obj_name_from_oh(in, oh); + parent = yaffs_find_or_create_by_number(dev, + oh->parent_obj_id, + YAFFS_OBJECT_TYPE_DIRECTORY); + file_size = yaffs_oh_to_size(oh); + is_shrink = oh->is_shrink; + equiv_id = oh->equiv_id; + } else { + in->variant_type = tags.extra_obj_type; + parent = yaffs_find_or_create_by_number(dev, + tags.extra_parent_id, + YAFFS_OBJECT_TYPE_DIRECTORY); + file_size = tags.extra_file_size; + is_shrink = tags.extra_is_shrink; + equiv_id = tags.extra_equiv_id; + in->lazy_loaded = 1; + } + in->dirty = 0; + + if (!parent) + alloc_failed = 1; + + /* directory stuff... + * hook up to parent + */ + + if (parent && + parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) { + /* Set up as a directory */ + parent->variant_type = + YAFFS_OBJECT_TYPE_DIRECTORY; + INIT_LIST_HEAD(&parent-> + variant.dir_variant.children); + } else if (!parent || + parent->variant_type != + YAFFS_OBJECT_TYPE_DIRECTORY) { + /* Hoosterman, another problem.... + * Trying to use a non-directory as a directory + */ + + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." + ); + parent = dev->lost_n_found; + } + yaffs_add_obj_to_dir(parent, in); + + is_unlinked = (parent == dev->del_dir) || + (parent == dev->unlinked_dir); + + if (is_shrink) + /* Mark the block */ + bi->has_shrink_hdr = 1; + + /* Note re hardlinks. + * Since we might scan a hardlink before its equivalent + * object is scanned we put them all in a list. + * After scanning is complete, we should have all the + * objects, so we run through this list and fix up all + * the chains. + */ + + switch (in->variant_type) { + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* Todo got a problem */ + break; + case YAFFS_OBJECT_TYPE_FILE: + file_var = &in->variant.file_variant; + if (file_var->scanned_size < file_size) { + /* This covers the case where the file + * size is greater than the data held. + * This will happen if the file is + * resized to be larger than its + * current data extents. + */ + file_var->file_size = file_size; + file_var->scanned_size = file_size; + } + + if (file_var->shrink_size > file_size) + file_var->shrink_size = file_size; + + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + hl_var = &in->variant.hardlink_variant; + if (!is_unlinked) { + hl_var->equiv_id = equiv_id; + list_add(&in->hard_links, hard_list); + } + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + sl_var = &in->variant.symlink_variant; + if (oh) { + sl_var->alias = + yaffs_clone_str(oh->alias); + if (!sl_var->alias) + alloc_failed = 1; + } + break; + } + } + } + return alloc_failed ? YAFFS_FAIL : YAFFS_OK; +} + +int yaffs2_scan_backwards(struct yaffs_dev *dev) +{ + int blk; + int block_iter; + int start_iter; + int end_iter; + int n_to_scan = 0; + enum yaffs_block_state state; + int c; + int deleted; + LIST_HEAD(hard_list); + struct yaffs_block_info *bi; + u32 seq_number; + int n_blocks = dev->internal_end_block - dev->internal_start_block + 1; + u8 *chunk_data; + int found_chunks; + int alloc_failed = 0; + struct yaffs_block_index *block_index = NULL; + int alt_block_index = 0; + int summary_available; + + yaffs_trace(YAFFS_TRACE_SCAN, + "yaffs2_scan_backwards starts intstartblk %d intendblk %d...", + dev->internal_start_block, dev->internal_end_block); + + dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER; + + block_index = + kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS); + + if (!block_index) { + block_index = + vmalloc(n_blocks * sizeof(struct yaffs_block_index)); + alt_block_index = 1; + } + + if (!block_index) { + yaffs_trace(YAFFS_TRACE_SCAN, + "yaffs2_scan_backwards() could not allocate block index!" + ); + return YAFFS_FAIL; + } + + dev->blocks_in_checkpt = 0; + + chunk_data = yaffs_get_temp_buffer(dev); + + /* Scan all the blocks to determine their state */ + bi = dev->block_info; + for (blk = dev->internal_start_block; blk <= dev->internal_end_block; + blk++) { + yaffs_clear_chunk_bits(dev, blk); + bi->pages_in_use = 0; + bi->soft_del_pages = 0; + + yaffs_query_init_block_state(dev, blk, &state, &seq_number); + + bi->block_state = state; + bi->seq_number = seq_number; + + if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA) + bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; + if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK) + bi->block_state = YAFFS_BLOCK_STATE_DEAD; + + yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, + "Block scanning block %d state %d seq %d", + blk, bi->block_state, seq_number); + + if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) { + dev->blocks_in_checkpt++; + + } else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) { + yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, + "block %d is bad", blk); + } else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { + yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty "); + dev->n_erased_blocks++; + dev->n_free_chunks += dev->param.chunks_per_block; + } else if (bi->block_state == + YAFFS_BLOCK_STATE_NEEDS_SCAN) { + /* Determine the highest sequence number */ + if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER && + seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) { + block_index[n_to_scan].seq = seq_number; + block_index[n_to_scan].block = blk; + n_to_scan++; + if (seq_number >= dev->seq_number) + dev->seq_number = seq_number; + } else { + /* TODO: Nasty sequence number! */ + yaffs_trace(YAFFS_TRACE_SCAN, + "Block scanning block %d has bad sequence number %d", + blk, seq_number); + } + } + bi++; + } + + yaffs_trace(YAFFS_TRACE_SCAN, "%d blocks to be sorted...", n_to_scan); + + cond_resched(); + + /* Sort the blocks by sequence number */ + sort(block_index, n_to_scan, sizeof(struct yaffs_block_index), + yaffs2_ybicmp, NULL); + + cond_resched(); + + yaffs_trace(YAFFS_TRACE_SCAN, "...done"); + + /* Now scan the blocks looking at the data. */ + start_iter = 0; + end_iter = n_to_scan - 1; + yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan); + + /* For each block.... backwards */ + for (block_iter = end_iter; + !alloc_failed && block_iter >= start_iter; + block_iter--) { + /* Cooperative multitasking! This loop can run for so + long that watchdog timers expire. */ + cond_resched(); + + /* get the block to scan in the correct order */ + blk = block_index[block_iter].block; + bi = yaffs_get_block_info(dev, blk); + deleted = 0; + + summary_available = yaffs_summary_read(dev, dev->sum_tags, blk); + + /* For each chunk in each block that needs scanning.... */ + found_chunks = 0; + if (summary_available) + c = dev->chunks_per_summary - 1; + else + c = dev->param.chunks_per_block - 1; + + for (/* c is already initialised */; + !alloc_failed && c >= 0 && + (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN || + bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING); + c--) { + /* Scan backwards... + * Read the tags and decide what to do + */ + if (yaffs2_scan_chunk(dev, bi, blk, c, + &found_chunks, chunk_data, + &hard_list, summary_available) == + YAFFS_FAIL) + alloc_failed = 1; + } + + if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) { + /* If we got this far while scanning, then the block + * is fully allocated. */ + bi->block_state = YAFFS_BLOCK_STATE_FULL; + } + + /* Now let's see if it was dirty */ + if (bi->pages_in_use == 0 && + !bi->has_shrink_hdr && + bi->block_state == YAFFS_BLOCK_STATE_FULL) { + yaffs_block_became_dirty(dev, blk); + } + } + + yaffs_skip_rest_of_block(dev); + + if (alt_block_index) + vfree(block_index); + else + kfree(block_index); + + /* Ok, we've done all the scanning. + * Fix up the hard link chains. + * We have scanned all the objects, now it's time to add these + * hardlinks. + */ + yaffs_link_fixup(dev, &hard_list); + + yaffs_release_temp_buffer(dev, chunk_data); + + if (alloc_failed) + return YAFFS_FAIL; + + yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends"); + + return YAFFS_OK; +} diff --git a/fs/yaffs2/yaffs_yaffs2.h b/fs/yaffs2/yaffs_yaffs2.h new file mode 100644 index 000000000000..2363bfd8bcab --- /dev/null +++ b/fs/yaffs2/yaffs_yaffs2.h @@ -0,0 +1,39 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YAFFS_YAFFS2_H__ +#define __YAFFS_YAFFS2_H__ + +#include "yaffs_guts.h" + +void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev); +void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev); +void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev, + struct yaffs_block_info *bi); +void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no, + struct yaffs_block_info *bi); +int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi); +u32 yaffs2_find_refresh_block(struct yaffs_dev *dev); +int yaffs2_checkpt_required(struct yaffs_dev *dev); +int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev); + +void yaffs2_checkpt_invalidate(struct yaffs_dev *dev); +int yaffs2_checkpt_save(struct yaffs_dev *dev); +int yaffs2_checkpt_restore(struct yaffs_dev *dev); + +int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size); +int yaffs2_scan_backwards(struct yaffs_dev *dev); + +#endif diff --git a/fs/yaffs2/yportenv.h b/fs/yaffs2/yportenv.h new file mode 100644 index 000000000000..0e4e64e45f47 --- /dev/null +++ b/fs/yaffs2/yportenv.h @@ -0,0 +1,85 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@aleph1.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +#ifndef __YPORTENV_H__ +#define __YPORTENV_H__ + +/* + * Define the MTD version in terms of Linux Kernel versions + * This allows yaffs to be used independantly of the kernel + * as well as with it. + */ + +#define MTD_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c)) + +#ifdef YAFFS_OUT_OF_TREE +#include "moduleconfig.h" +#endif + +#include <linux/version.h> +#define MTD_VERSION_CODE LINUX_VERSION_CODE + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)) +#include <linux/config.h> +#endif +#include <linux/version.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/xattr.h> +#include <linux/list.h> +#include <linux/types.h> +#include <linux/fs.h> +#include <linux/stat.h> +#include <linux/sort.h> +#include <linux/bitops.h> + +/* These type wrappings are used to support Unicode names in WinCE. */ +#define YCHAR char +#define YUCHAR unsigned char +#define _Y(x) x + +#define YAFFS_LOSTNFOUND_NAME "lost+found" +#define YAFFS_LOSTNFOUND_PREFIX "obj" + + +#define YAFFS_ROOT_MODE 0755 +#define YAFFS_LOSTNFOUND_MODE 0700 + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) +#define Y_CURRENT_TIME ktime_get_real_seconds() +#define Y_TIME_CONVERT(x) (x).tv_sec +#else +#define Y_CURRENT_TIME CURRENT_TIME +#define Y_TIME_CONVERT(x) (x) +#endif + +#define compile_time_assertion(assertion) \ + ({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; }) + + +#define yaffs_printf(msk, fmt, ...) \ + printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__) + +#define yaffs_trace(msk, fmt, ...) do { \ + if (yaffs_trace_mask & (msk)) \ + printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__); \ +} while (0) + + +#endif diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index bf39d9c92201..979f81a4015e 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -59,6 +59,7 @@ struct nfs_client { u32 cl_minorversion;/* NFSv4 minorversion */ struct rpc_cred *cl_machine_cred; + int nfs_prog; #if IS_ENABLED(CONFIG_NFS_V4) struct list_head cl_ds_clients; /* auth flavor data servers */ @@ -81,6 +82,7 @@ struct nfs_client { const char * cl_owner_id; u32 cl_cb_ident; /* v4.0 callback identifier */ + const struct nfs4_minor_version_ops *cl_mvops; unsigned long cl_mig_gen; diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index cab24a127feb..b37d28c26a66 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -12,7 +12,7 @@ * reasonable for NFS over UDP. */ #define NFS_MAX_FILE_IO_SIZE (1048576U) -#define NFS_DEF_FILE_IO_SIZE (4096U) +#define NFS_DEF_FILE_IO_SIZE CONFIG_NFS_DEF_FILE_IO_SIZE #define NFS_MIN_FILE_IO_SIZE (1024U) struct nfs4_string { diff --git a/include/uapi/linux/msdos_fs.h b/include/uapi/linux/msdos_fs.h index fde753735aba..844700c7abe7 100644 --- a/include/uapi/linux/msdos_fs.h +++ b/include/uapi/linux/msdos_fs.h @@ -48,6 +48,7 @@ #define CASE_LOWER_BASE 8 /* base is lower case */ #define CASE_LOWER_EXT 16 /* extension is lower case */ +#define FAT_NO_83NAME 32 /* no 8.3 short filename for this file */ #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) diff --git a/include/uapi/linux/nfs_mount.h b/include/uapi/linux/nfs_mount.h index e44e00616ab5..af94a8b7ad5c 100644 --- a/include/uapi/linux/nfs_mount.h +++ b/include/uapi/linux/nfs_mount.h @@ -21,7 +21,7 @@ * mount-to-kernel version compatibility. Some of these aren't used yet * but here they are anyway. */ -#define NFS_MOUNT_VERSION 6 +#define NFS_MOUNT_VERSION 7 #define NFS_MAX_CONTEXT_LEN 256 struct nfs_mount_data { @@ -44,6 +44,8 @@ struct nfs_mount_data { struct nfs3_fh root; /* 4 */ int pseudoflavor; /* 5 */ char context[NFS_MAX_CONTEXT_LEN + 1]; /* 6 */ + int nfs_prog; /* 7 */ + int mount_prog; /* 7 */ }; /* bits in the flags field visible to user space */ diff --git a/include/video/uvesafb.h b/include/video/uvesafb.h index 8d2a3bfc8dac..f6cbd0d3c8ed 100644 --- a/include/video/uvesafb.h +++ b/include/video/uvesafb.h @@ -89,7 +89,9 @@ struct vbe_mode_ib { #define UVESAFB_DEFAULT_MODE "640x480-16" -/* How long to wait for a reply from userspace [ms] */ +/* How long to wait for a reply from userspace [ms] + * This is the default value of module param task_timeout + */ #define UVESAFB_TIMEOUT 5000 /* Max number of concurrent tasks */ diff --git a/init/Kconfig b/init/Kconfig index 47035b5a46f6..8b0dd14a1b4e 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1166,6 +1166,31 @@ menuconfig EXPERT environments which can tolerate a "non-standard" kernel. Only use this if you really know what you are doing. +config UPTIME_LIMITED_KERNEL + bool "Create a kernel with uptime limitations" + default n + help + Limit the amount of time a kernel can run. The associated UPTIME_LIMIT* + kernel config options should be used to tune the behaviour. + +config UPTIME_LIMIT_DURATION + int "Kernel uptime limit in minutes" + depends on UPTIME_LIMITED_KERNEL + range 0 14400 + default 0 + help + Define the uptime limitation on a kernel in minutes. Once + the defined time expires the kernel will emit a warning, cease + to be usable and eventually restart. The valid range is 0 (disable) + to 14400 (10 days) + +config UPTIME_LIMIT_KERNEL_REBOOT + bool "Reboot a time limited kernel at expiration" + depends on UPTIME_LIMITED_KERNEL + default y + help + Reboot an uptime limited kernel at expiration. + config UID16 bool "Enable 16-bit UID system calls" if EXPERT depends on HAVE_UID16 && MULTIUSER diff --git a/init/do_mounts.c b/init/do_mounts.c index e1c9afa9d8c9..033109b51317 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -407,7 +407,9 @@ retry: printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " "explicit textual name for \"root=\" boot option.\n"); #endif - panic("VFS: Unable to mount root fs on %s", b); + printk(KERN_EMERG "VFS: Unable to mount root fs on %s\n", b); + printk(KERN_EMERG "User configuration error - no valid root filesystem found\n"); + panic("Invalid configuration from end user prevents continuing"); } if (!(flags & SB_RDONLY)) { flags |= SB_RDONLY; @@ -423,7 +425,9 @@ retry: #ifdef CONFIG_BLOCK __bdevname(ROOT_DEV, b); #endif - panic("VFS: Unable to mount root fs on %s", b); + printk(KERN_EMERG "VFS: Unable to mount root fs on %s\n", b); + printk(KERN_EMERG "User configuration error - no valid root filesystem found\n"); + panic("Invalid configuration from end user prevents continuing"); out: put_page(page); } diff --git a/init/main.c b/init/main.c index 020972fed117..d9d57f334c41 100644 --- a/init/main.c +++ b/init/main.c @@ -1111,6 +1111,9 @@ static int __ref kernel_init(void *unused) static noinline void __init kernel_init_freeable(void) { +#ifndef CONFIG_BLK_DEV_INITRD + struct kstat console_stat; +#endif /* * Wait until kthreadd is all set-up. */ @@ -1144,6 +1147,18 @@ static noinline void __init kernel_init_freeable(void) do_basic_setup(); +#ifndef CONFIG_BLK_DEV_INITRD + /* + * Use /dev/console to infer if the rootfs is setup properly. + * In case of initrd or initramfs /dev/console might be instantiated + * later by /init so don't do this check for CONFIG_BLK_DEV_INITRD + */ + if (vfs_lstat((char __user *) "/dev/console", (struct kstat __user *) &console_stat) + || !S_ISCHR(console_stat.mode)) { + panic("/dev/console is missing or not a character device!\nPlease ensure your rootfs is properly configured\n"); + } +#endif + /* Open the /dev/console on the rootfs, this should never fail */ if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) pr_err("Warning: unable to open an initial console.\n"); diff --git a/kernel/Makefile b/kernel/Makefile index ad4b324d8906..922d7921837a 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -49,6 +49,7 @@ obj-$(CONFIG_FREEZER) += freezer.o obj-$(CONFIG_PROFILING) += profile.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += time/ +obj-$(CONFIG_UPTIME_LIMITED_KERNEL) += uptime_limit.o obj-$(CONFIG_FUTEX) += futex.o obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o obj-$(CONFIG_SMP) += smp.o diff --git a/kernel/uptime_limit.c b/kernel/uptime_limit.c new file mode 100644 index 000000000000..b6a1a5e4f9d9 --- /dev/null +++ b/kernel/uptime_limit.c @@ -0,0 +1,166 @@ +/* + * uptime_limit.c + * + * This file contains the functions which can limit kernel uptime + * + * Copyright (C) 2011 Bruce Ashfield (bruce.ashfield@windriver.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * + * This functionality is somewhat close to the softdog watchdog + * implementation, but it cannot be used directly for several reasons: + * + * - The soft watchdog should be available while this functionality is active + * - The duration range is different between this and the softdog. The + * timeout available here is potentially quite a bit longer. + * - At expiration, there are different expiration requirements and actions. + * - This functionality is specific to a particular use case and should + * not impact mainline functionality + * + */ +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <linux/timer.h> +#include <linux/delay.h> +#include <linux/kthread.h> + +#define UPTIME_LIMIT_IN_SECONDS (CONFIG_UPTIME_LIMIT_DURATION * 60) +#define MIN(X, Y) ((X) <= (Y) ? (X) : (Y)) +#define TEN_MINUTES_IN_SECONDS 600 + +enum uptime_expiration_type { + uptime_no_action, + uptime_reboot +}; + +static enum uptime_expiration_type uptime_expiration_action = uptime_no_action; +static struct timer_list timelimit_timer; +static struct task_struct *uptime_worker_task; + +static void timelimit_expire(unsigned long timeout_seconds) +{ + char msg[128]; + int msglen = 127; + + if (timeout_seconds) { + if (timeout_seconds >= 60) + snprintf(msg, msglen, + "Uptime: kernel validity duration has %d %s remaining\n", + (int) timeout_seconds / 60, "minute(s)"); + else + snprintf(msg, msglen, + "Uptime: kernel validity duration has %d %s remaining\n", + (int) timeout_seconds, "seconds"); + + printk(KERN_CRIT "%s", msg); + + timelimit_timer.expires = jiffies + timeout_seconds * HZ; + timelimit_timer.data = 0; + add_timer_on(&timelimit_timer, cpumask_first(cpu_online_mask)); + } else { + printk(KERN_CRIT "Uptime: Kernel validity timeout has expired\n"); +#ifdef CONFIG_UPTIME_LIMIT_KERNEL_REBOOT + uptime_expiration_action = uptime_reboot; + wake_up_process(uptime_worker_task); + } +#endif +} + +/* + * This thread starts and then immediately goes to sleep. When it is woken + * up, it carries out the instructions left in uptime_expiration_action. If + * no action was specified it simply goes back to sleep. + */ +static int uptime_worker(void *unused) +{ + set_current_state(TASK_INTERRUPTIBLE); + + while (!kthread_should_stop()) { + schedule(); + + if (kthread_should_stop()) + break; + + if (uptime_expiration_action == uptime_reboot) { + printk(KERN_CRIT "Uptime: restarting machine\n"); + kernel_restart(NULL); + } + + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); + + return 0; +} + +static int timeout_enable(int cpu) +{ + int err = 0; + int warning_limit; + + /* + * Create an uptime worker thread. This thread is required since the + * safe version of kernel restart cannot be called from a + * non-interruptible context. Which means we cannot call it directly + * from a timer callback. So we arrange for the timer expiration to + * wakeup a thread, which performs the action. + */ + uptime_worker_task = kthread_create(uptime_worker, + (void *)(unsigned long)cpu, + "uptime_worker/%d", cpu); + if (IS_ERR(uptime_worker_task)) { + printk(KERN_ERR "Uptime: task for cpu %i failed\n", cpu); + err = PTR_ERR(uptime_worker_task); + goto out; + } + /* bind to cpu0 to avoid migration and hot plug nastiness */ + kthread_bind(uptime_worker_task, cpu); + wake_up_process(uptime_worker_task); + + /* Create the timer that will wake the uptime thread at expiration */ + init_timer(&timelimit_timer); + timelimit_timer.function = timelimit_expire; + /* + * Fire two timers. One warning timeout and the final timer + * which will carry out the expiration action. The warning timer will + * expire at the minimum of half the original time or ten minutes. + */ + warning_limit = MIN(UPTIME_LIMIT_IN_SECONDS/2, TEN_MINUTES_IN_SECONDS); + timelimit_timer.expires = jiffies + warning_limit * HZ; + timelimit_timer.data = UPTIME_LIMIT_IN_SECONDS - warning_limit; + + add_timer_on(&timelimit_timer, cpumask_first(cpu_online_mask)); +out: + return err; +} + +static int __init timelimit_init(void) +{ + int err = 0; + + printk(KERN_INFO "Uptime: system uptime restrictions enabled\n"); + + /* + * Enable the timeout thread for cpu 0 only, assuming that the + * uptime limit is non-zero, to protect against any cpu + * migration issues. + */ + if (UPTIME_LIMIT_IN_SECONDS) + err = timeout_enable(0); + + return err; +} +device_initcall(timelimit_init); diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index e90c89ef8c08..9e17cd05daff 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -899,7 +899,14 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb) agents are active. Taking the first reply prevents arp trashing and chooses the fastest router. */ - override = time_after(jiffies, + /* + * If n->updated is after jiffies, then the clock has wrapped and + * we are *well* past the locktime, so set the override flag + */ + if (time_after(n->updated, jiffies)) + override = 1; + else + override = time_after(jiffies, n->updated + NEIGH_VAR(n->parms, LOCKTIME)) || is_garp; diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh index 593f8879c641..fe1d3fc0d33a 100755 --- a/scripts/headers_install.sh +++ b/scripts/headers_install.sh @@ -38,6 +38,7 @@ do -e 's/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g' \ -e 's/(^|[[:space:](])(inline|asm|volatile)([[:space:](]|$)/\1__\2__\3/g' \ -e 's@#(ifndef|define|endif[[:space:]]*/[*])[[:space:]]*_UAPI@#\1 @' \ + -e ':1;s/(#(if|elif)(.*[^A-Za-z0-9_])defined\([[:space:]]*)_UAPI/\1/;t1' \ "$SRCDIR/$i" > "$OUTDIR/$FILE.sed" || exit 1 scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ "$OUTDIR/$FILE.sed" \ > "$OUTDIR/$FILE" diff --git a/scripts/kconfig/mconf-cfg.sh b/scripts/kconfig/mconf-cfg.sh index c812872d7f9d..65a9b9e5b8a6 100755..100644 --- a/scripts/kconfig/mconf-cfg.sh +++ b/scripts/kconfig/mconf-cfg.sh @@ -4,6 +4,14 @@ PKG="ncursesw" PKG2="ncurses" +if [ "$CROSS_CURSES_LIB" != "" ]; then + echo libs=\'$CROSS_CURSES_LIB\' + if [ x"$CROSS_CURSES_INC" != x ]; then + echo cflags=\'$CROSS_CURSES_INC\' + fi + exit 0 +fi + if [ -n "$(command -v pkg-config)" ]; then if pkg-config --exists $PKG; then echo cflags=\"$(pkg-config --cflags $PKG)\" diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 858cbe56b100..205ca5ccd930 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -383,9 +383,10 @@ failed: * spaces in the beginning of the line is trimmed away. * Return a pointer to a static buffer. **/ +#define MODPOST_MAX_LINE 32768 char *get_next_line(unsigned long *pos, void *file, unsigned long size) { - static char line[4096]; + static char line[MODPOST_MAX_LINE]; int skip = 1; size_t len = 0; signed char *p = (signed char *)file + *pos; @@ -400,8 +401,11 @@ char *get_next_line(unsigned long *pos, void *file, unsigned long size) if (*p != '\n' && (*pos < size)) { len++; *s++ = *p++; - if (len > 4095) + if (len > (sizeof(line)-1)) { + warn(" %s: line exceeds buffer size %zu bytes\n" + , __func__, sizeof(line)); break; /* Too long, stop */ + } } else { /* End of string */ *s = '\0'; @@ -1937,7 +1941,7 @@ static void read_symbols(const char *modname) char *version; char *license; struct module *mod; - struct elf_info info = { }; + struct elf_info info = { .hdr = NULL }; Elf_Sym *sym; if (!parse_elf(&info, modname)) @@ -2383,7 +2387,7 @@ static int dump_sym(struct symbol *sym) static void write_dump(const char *fname) { - struct buffer buf = { }; + struct buffer buf = { NULL, 0, 0 }; struct symbol *symbol; int n; @@ -2410,7 +2414,7 @@ struct ext_sym_list { int main(int argc, char **argv) { struct module *mod; - struct buffer buf = { }; + struct buffer buf = { NULL, 0, 0 }; char *kernel_read = NULL, *module_read = NULL; char *dump_write = NULL, *files_source = NULL; int opt; diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h index 1827c2f973f9..2868ec890b37 100644 --- a/tools/include/linux/compiler.h +++ b/tools/include/linux/compiler.h @@ -38,6 +38,7 @@ #define __always_inline inline #endif +#undef __user #define __user #define __rcu #define __read_mostly diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 510caedd7319..99bdc7e63417 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -206,10 +206,10 @@ strip-libs = $(filter-out -l%,$(1)) PYTHON_CONFIG_SQ := $(call shell-sq,$(PYTHON_CONFIG)) ifdef PYTHON_CONFIG - PYTHON_EMBED_LDOPTS := $(shell $(PYTHON_CONFIG_SQ) --ldflags 2>/dev/null) + PYTHON_EMBED_LDOPTS := $(shell pkg-config --libs python 2>/dev/null) PYTHON_EMBED_LDFLAGS := $(call strip-libs,$(PYTHON_EMBED_LDOPTS)) PYTHON_EMBED_LIBADD := $(call grep-libs,$(PYTHON_EMBED_LDOPTS)) -lutil - PYTHON_EMBED_CCOPTS := $(shell $(PYTHON_CONFIG_SQ) --includes 2>/dev/null) + PYTHON_EMBED_CCOPTS := $(shell pkg-config --includes python 2>/dev/null) FLAGS_PYTHON_EMBED := $(PYTHON_EMBED_CCOPTS) $(PYTHON_EMBED_LDOPTS) endif @@ -600,8 +600,9 @@ ifndef NO_SLANG msg := $(warning slang not found, disables TUI support. Please install slang-devel, libslang-dev or libslang2-dev); NO_SLANG := 1 else - # Fedora has /usr/include/slang/slang.h, but ubuntu /usr/include/slang.h - CFLAGS += -I/usr/include/slang + # Some releases like Fedora have /usr/include/slang/slang.h instead of /usr/include/slang.h + SLANG_INC ?= -idirafter =/usr/include/slang + CFLAGS += $(SLANG_INC) CFLAGS += -DHAVE_SLANG_SUPPORT EXTLIBS += -lslang $(call detected,CONFIG_SLANG) @@ -636,6 +637,7 @@ else FLAGS_PERL_EMBED=$(PERL_EMBED_CCOPTS) $(PERL_EMBED_LDOPTS) ifneq ($(feature-libperl), 1) + msg := $(warning libperl not found, disables Perl scripting support. Please install libperl-dev or perl-devel); CFLAGS += -DNO_LIBPERL NO_LIBPERL := 1 msg := $(warning Missing perl devel files. Disabling perl scripting support, please install perl-ExtUtils-Embed/libperl-dev); diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index 0be411695379..415545c3aeda 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -832,7 +832,7 @@ install-bin: install-tools install-tests install-traceevent-plugins install: install-bin try-install-man install-python_ext: - $(PYTHON_WORD) util/setup.py --quiet install --root='/$(DESTDIR_SQ)' + $(PYTHON_WORD) util/setup.py --quiet install --prefix='$(DESTDIR_SQ)/usr' # 'make install-doc' should call 'make -C Documentation install' $(INSTALL_DOC_TARGETS): diff --git a/tools/perf/arch/x86/tests/gen-insn-x86-dat.awk b/tools/perf/arch/x86/tests/gen-insn-x86-dat.awk index a21454835cd4..2f5e8c99f372 100644 --- a/tools/perf/arch/x86/tests/gen-insn-x86-dat.awk +++ b/tools/perf/arch/x86/tests/gen-insn-x86-dat.awk @@ -1,4 +1,4 @@ -#!/bin/awk -f +#!/usr/bin/awk -f # gen-insn-x86-dat.awk: script to convert data for the insn-x86 test # Copyright (c) 2015, Intel Corporation. # diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c index 91c0a4434da2..03e935b65ce6 100644 --- a/tools/perf/bench/numa.c +++ b/tools/perf/bench/numa.c @@ -27,6 +27,7 @@ #include <string.h> #include <unistd.h> #include <sys/mman.h> +#include <inttypes.h> #include <sys/time.h> #include <sys/resource.h> #include <sys/wait.h> @@ -1194,7 +1195,7 @@ static void *worker_thread(void *__tdata) /* Check whether our max runtime timed out: */ if (g->p.nr_secs) { timersub(&stop, &start0, &diff); - if ((u32)diff.tv_sec >= g->p.nr_secs) { + if ((u32)diff.tv_sec >= (long int)g->p.nr_secs) { g->stop_work = true; break; } diff --git a/tools/perf/perf.h b/tools/perf/perf.h index 19d435a9623b..cf2e0e71a92a 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -14,6 +14,8 @@ void test_attr__init(void); void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu, int fd, int group_fd, unsigned long flags); +#include <stdbool.h> + #define HAVE_ATTR_TEST #include "perf-sys.h" diff --git a/tools/perf/scripts/python/Perf-Trace-Util/Context.c b/tools/perf/scripts/python/Perf-Trace-Util/Context.c index 1a0d27757eec..5795bca4f04a 100644 --- a/tools/perf/scripts/python/Perf-Trace-Util/Context.c +++ b/tools/perf/scripts/python/Perf-Trace-Util/Context.c @@ -19,6 +19,10 @@ * */ +#ifdef __mips__ +#include <sgidefs.h> +#endif + #include <Python.h> #include "../../../perf.h" #include "../../../util/trace-event.h" diff --git a/tools/perf/tests/attr.c b/tools/perf/tests/attr.c index 05dfe11c2f9e..dd2cf792eef6 100644 --- a/tools/perf/tests/attr.c +++ b/tools/perf/tests/attr.c @@ -73,7 +73,7 @@ static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, return 0; snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, - attr->type, attr->config, fd); + attr->type, (unsigned long long)attr->config, fd); file = fopen(path, "w+"); if (!file) { @@ -82,7 +82,7 @@ static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, } if (fprintf(file, "[event-%d-%llu-%d]\n", - attr->type, attr->config, fd) < 0) { + attr->type, (unsigned long long)attr->config, fd) < 0) { perror("test attr - failed to write event file"); fclose(file); return -1; @@ -98,10 +98,10 @@ static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, /* struct perf_event_attr */ WRITE_ASS(type, PRIu32); WRITE_ASS(size, PRIu32); - WRITE_ASS(config, "llu"); - WRITE_ASS(sample_period, "llu"); - WRITE_ASS(sample_type, "llu"); - WRITE_ASS(read_format, "llu"); + __WRITE_ASS(config, "llu", (unsigned long long)attr->config); + __WRITE_ASS(sample_period, "llu", (unsigned long long)attr->sample_period); + __WRITE_ASS(sample_type, "llu", (unsigned long long)attr->sample_type); + __WRITE_ASS(read_format, "llu", (unsigned long long)attr->read_format); WRITE_ASS(disabled, "d"); WRITE_ASS(inherit, "d"); WRITE_ASS(pinned, "d"); @@ -132,10 +132,10 @@ static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, WRITE_ASS(use_clockid, "d"); WRITE_ASS(wakeup_events, PRIu32); WRITE_ASS(bp_type, PRIu32); - WRITE_ASS(config1, "llu"); - WRITE_ASS(config2, "llu"); - WRITE_ASS(branch_sample_type, "llu"); - WRITE_ASS(sample_regs_user, "llu"); + __WRITE_ASS(config1, "llu", (unsigned long long)attr->config1); + __WRITE_ASS(config2, "llu", (unsigned long long)attr->config2); + __WRITE_ASS(branch_sample_type, "llu", (unsigned long long)attr->branch_sample_type); + __WRITE_ASS(sample_regs_user, "llu", (unsigned long long)attr->sample_regs_user); WRITE_ASS(sample_stack_user, PRIu32); fclose(file); diff --git a/tools/perf/tests/bp_signal.c b/tools/perf/tests/bp_signal.c index 910e25e64188..caedb5ec1523 100644 --- a/tools/perf/tests/bp_signal.c +++ b/tools/perf/tests/bp_signal.c @@ -128,7 +128,7 @@ static int __event(bool is_x, void *addr, int sig) fd = sys_perf_event_open(&pe, 0, -1, -1, perf_event_open_cloexec_flag()); if (fd < 0) { - pr_debug("failed opening event %llx\n", pe.config); + pr_debug("failed opening event %llx\n", (unsigned long long)pe.config); return TEST_FAIL; } diff --git a/tools/perf/tests/bp_signal_overflow.c b/tools/perf/tests/bp_signal_overflow.c index ca962559e845..35e1de86b295 100644 --- a/tools/perf/tests/bp_signal_overflow.c +++ b/tools/perf/tests/bp_signal_overflow.c @@ -95,7 +95,7 @@ int test__bp_signal_overflow(struct test *test __maybe_unused, int subtest __may fd = sys_perf_event_open(&pe, 0, -1, -1, perf_event_open_cloexec_flag()); if (fd < 0) { - pr_debug("failed opening event %llx\n", pe.config); + pr_debug("failed opening event %llx\n", (unsigned long long)pe.config); return TEST_FAIL; } diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c index 6958d7eed5be..57c796490761 100644 --- a/tools/perf/util/annotate.c +++ b/tools/perf/util/annotate.c @@ -1693,7 +1693,7 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args) err = asprintf(&command, "%s %s%s --start-address=0x%016" PRIx64 " --stop-address=0x%016" PRIx64 - " -l -d %s %s -C \"%s\" 2>/dev/null|grep -v \"%s:\"|expand", + " -l -d %s %s -C \"%s\" 2>/dev/null|grep -v \"%s:\"|sed 's/\t/ /g'", opts->objdump_path ?: "objdump", opts->disassembler_style ? "-M " : "", opts->disassembler_style ?: "", diff --git a/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk b/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk index ddd5c4c21129..d236058fc4e2 100644 --- a/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk +++ b/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk @@ -1,4 +1,4 @@ -#!/bin/awk -f +#!/usr/bin/awk -f # SPDX-License-Identifier: GPL-2.0 # gen-insn-attr-x86.awk: Instruction attribute table generator # Written by Masami Hiramatsu <mhiramat@redhat.com> diff --git a/tools/perf/util/libunwind/x86_32.c b/tools/perf/util/libunwind/x86_32.c index c5e568188e19..d493f96b806d 100644 --- a/tools/perf/util/libunwind/x86_32.c +++ b/tools/perf/util/libunwind/x86_32.c @@ -21,6 +21,7 @@ #define LIBUNWIND__ARCH_REG_IP PERF_REG_X86_IP #define LIBUNWIND__ARCH_REG_SP PERF_REG_X86_SP +#include <errno.h> #include "unwind.h" #include "debug.h" #include "libunwind-x86.h" diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c index 9569cc06e0a7..0f625a08452a 100644 --- a/tools/perf/util/scripting-engines/trace-event-python.c +++ b/tools/perf/util/scripting-engines/trace-event-python.c @@ -19,6 +19,10 @@ * */ +#ifdef __mips__ +#include <sgidefs.h> +#endif + #include <Python.h> #include <inttypes.h> diff --git a/tools/testing/selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk b/tools/testing/selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk index e05182d3e47d..6798ab45032d 100755..100644 --- a/tools/testing/selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk +++ b/tools/testing/selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk @@ -1,4 +1,4 @@ -#!/usr/bin/awk -f +#!/usr/usr/bin/awk -f # SPDX-License-Identifier: GPL-2.0 # Modify SRCU for formal verification. The first argument should be srcu.h and diff --git a/usr/Makefile b/usr/Makefile index 138c18cefb52..8318764a1e7c 100644 --- a/usr/Makefile +++ b/usr/Makefile @@ -27,7 +27,7 @@ $(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE # Generate the initramfs cpio archive hostprogs-y := gen_init_cpio -initramfs := $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh +initramfs := $(INITRAMFS_WRAPPER) $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) ramfs-args := \ |