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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2005-2019 Junjiro R. Okajima
*
* This program, aufs 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, see <http://www.gnu.org/licenses/>.
*/
/*
* lookup and dentry operations
*/
#ifndef __AUFS_DENTRY_H__
#define __AUFS_DENTRY_H__
#ifdef __KERNEL__
#include <linux/dcache.h>
#include "dirren.h"
#include "rwsem.h"
struct au_hdentry {
struct dentry *hd_dentry;
aufs_bindex_t hd_id;
};
struct au_dinfo {
atomic_t di_generation;
struct au_rwsem di_rwsem;
aufs_bindex_t di_btop, di_bbot, di_bwh, di_bdiropq;
unsigned char di_tmpfile; /* to allow the different name */
struct au_hdentry *di_hdentry;
struct rcu_head rcu;
} ____cacheline_aligned_in_smp;
/* ---------------------------------------------------------------------- */
/* flags for au_lkup_dentry() */
#define AuLkup_ALLOW_NEG 1
#define AuLkup_IGNORE_PERM (1 << 1)
#define AuLkup_DIRREN (1 << 2)
#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name)
#define au_fset_lkup(flags, name) \
do { (flags) |= AuLkup_##name; } while (0)
#define au_fclr_lkup(flags, name) \
do { (flags) &= ~AuLkup_##name; } while (0)
#ifndef CONFIG_AUFS_DIRREN
#undef AuLkup_DIRREN
#define AuLkup_DIRREN 0
#endif
struct au_do_lookup_args {
unsigned int flags;
mode_t type;
struct qstr whname, *name;
struct au_dr_lookup dirren;
};
/* ---------------------------------------------------------------------- */
/* dentry.c */
extern const struct dentry_operations aufs_dop, aufs_dop_noreval;
struct au_branch;
struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent);
int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
struct dentry *h_parent, struct au_branch *br);
int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop,
unsigned int flags);
int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh);
int au_refresh_dentry(struct dentry *dentry, struct dentry *parent);
int au_reval_dpath(struct dentry *dentry, unsigned int sigen);
void au_refresh_dop(struct dentry *dentry, int force_reval);
/* dinfo.c */
void au_di_init_once(void *_di);
struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc);
void au_di_free(struct au_dinfo *dinfo);
void au_di_swap(struct au_dinfo *a, struct au_dinfo *b);
void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src);
int au_di_init(struct dentry *dentry);
void au_di_fin(struct dentry *dentry);
int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink);
void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
void di_read_unlock(struct dentry *d, int flags);
void di_downgrade_lock(struct dentry *d, int flags);
void di_write_lock(struct dentry *d, unsigned int lsc);
void di_write_unlock(struct dentry *d);
void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
void di_write_unlock2(struct dentry *d1, struct dentry *d2);
struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex);
struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex);
aufs_bindex_t au_dbtail(struct dentry *dentry);
aufs_bindex_t au_dbtaildir(struct dentry *dentry);
void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_dentry);
int au_digen_test(struct dentry *dentry, unsigned int sigen);
int au_dbrange_test(struct dentry *dentry);
void au_update_digen(struct dentry *dentry);
void au_update_dbrange(struct dentry *dentry, int do_put_zero);
void au_update_dbtop(struct dentry *dentry);
void au_update_dbbot(struct dentry *dentry);
int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
/* ---------------------------------------------------------------------- */
static inline struct au_dinfo *au_di(struct dentry *dentry)
{
return dentry->d_fsdata;
}
/* ---------------------------------------------------------------------- */
/* lock subclass for dinfo */
enum {
AuLsc_DI_CHILD, /* child first */
AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */
AuLsc_DI_CHILD3, /* copyup dirs */
AuLsc_DI_PARENT,
AuLsc_DI_PARENT2,
AuLsc_DI_PARENT3,
AuLsc_DI_TMP /* temp for replacing dinfo */
};
/*
* di_read_lock_child, di_write_lock_child,
* di_read_lock_child2, di_write_lock_child2,
* di_read_lock_child3, di_write_lock_child3,
* di_read_lock_parent, di_write_lock_parent,
* di_read_lock_parent2, di_write_lock_parent2,
* di_read_lock_parent3, di_write_lock_parent3,
*/
#define AuReadLockFunc(name, lsc) \
static inline void di_read_lock_##name(struct dentry *d, int flags) \
{ di_read_lock(d, flags, AuLsc_DI_##lsc); }
#define AuWriteLockFunc(name, lsc) \
static inline void di_write_lock_##name(struct dentry *d) \
{ di_write_lock(d, AuLsc_DI_##lsc); }
#define AuRWLockFuncs(name, lsc) \
AuReadLockFunc(name, lsc) \
AuWriteLockFunc(name, lsc)
AuRWLockFuncs(child, CHILD);
AuRWLockFuncs(child2, CHILD2);
AuRWLockFuncs(child3, CHILD3);
AuRWLockFuncs(parent, PARENT);
AuRWLockFuncs(parent2, PARENT2);
AuRWLockFuncs(parent3, PARENT3);
#undef AuReadLockFunc
#undef AuWriteLockFunc
#undef AuRWLockFuncs
#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem)
#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem)
#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem)
/* ---------------------------------------------------------------------- */
/* todo: memory barrier? */
static inline unsigned int au_digen(struct dentry *d)
{
return atomic_read(&au_di(d)->di_generation);
}
static inline void au_h_dentry_init(struct au_hdentry *hdentry)
{
hdentry->hd_dentry = NULL;
}
static inline struct au_hdentry *au_hdentry(struct au_dinfo *di,
aufs_bindex_t bindex)
{
return di->di_hdentry + bindex;
}
static inline void au_hdput(struct au_hdentry *hd)
{
if (hd)
dput(hd->hd_dentry);
}
static inline aufs_bindex_t au_dbtop(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_btop;
}
static inline aufs_bindex_t au_dbbot(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_bbot;
}
static inline aufs_bindex_t au_dbwh(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_bwh;
}
static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_bdiropq;
}
/* todo: hard/soft set? */
static inline void au_set_dbtop(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
au_di(dentry)->di_btop = bindex;
}
static inline void au_set_dbbot(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
au_di(dentry)->di_bbot = bindex;
}
static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
/* dbwh can be outside of btop - bbot range */
au_di(dentry)->di_bwh = bindex;
}
static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
au_di(dentry)->di_bdiropq = bindex;
}
/* ---------------------------------------------------------------------- */
#ifdef CONFIG_AUFS_HNOTIFY
static inline void au_digen_dec(struct dentry *d)
{
atomic_dec(&au_di(d)->di_generation);
}
static inline void au_hn_di_reinit(struct dentry *dentry)
{
dentry->d_fsdata = NULL;
}
#else
AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused)
#endif /* CONFIG_AUFS_HNOTIFY */
#endif /* __KERNEL__ */
#endif /* __AUFS_DENTRY_H__ */
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