/* * 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 * 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 #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 #endif #include #include #include #include #include #include #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39)) #include #endif #include #include #include #include #include #if (YAFFS_NEW_FOLLOW_LINK == 1) #include #endif #ifdef YAFFS_COMPILE_EXPORTFS #include #endif #ifdef YAFFS_COMPILE_BACKGROUND #include #include #endif #ifdef YAFFS_COMPILE_FREEZER #include #endif #include #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) #include #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 #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 #include #include #include #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");