/usr/src/aufs-4.9+20161219/fs/aufs/inode.h is in aufs-dkms 4.9+20161219-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2005-2016 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/>.
*/
/*
* inode operations
*/
#ifndef __AUFS_INODE_H__
#define __AUFS_INODE_H__
#ifdef __KERNEL__
#include <linux/fsnotify.h>
#include "rwsem.h"
struct vfsmount;
struct au_hnotify {
#ifdef CONFIG_AUFS_HNOTIFY
#ifdef CONFIG_AUFS_HFSNOTIFY
/* never use fsnotify_add_vfsmount_mark() */
struct fsnotify_mark hn_mark;
#endif
union {
struct inode *hn_aufs_inode; /* no get/put */
struct llist_node hn_lnode; /* delayed free */
};
#endif
} ____cacheline_aligned_in_smp;
struct au_hinode {
struct inode *hi_inode;
aufs_bindex_t hi_id;
#ifdef CONFIG_AUFS_HNOTIFY
struct au_hnotify *hi_notify;
#endif
/* reference to the copied-up whiteout with get/put */
struct dentry *hi_whdentry;
};
/* ig_flags */
#define AuIG_HALF_REFRESHED 1
#define au_ig_ftest(flags, name) ((flags) & AuIG_##name)
#define au_ig_fset(flags, name) \
do { (flags) |= AuIG_##name; } while (0)
#define au_ig_fclr(flags, name) \
do { (flags) &= ~AuIG_##name; } while (0)
struct au_iigen {
spinlock_t ig_spin;
__u32 ig_generation, ig_flags;
};
struct au_vdir;
struct au_iinfo {
struct au_iigen ii_generation;
struct super_block *ii_hsb1; /* no get/put */
struct au_rwsem ii_rwsem;
aufs_bindex_t ii_btop, ii_bbot;
__u32 ii_higen;
struct au_hinode *ii_hinode;
struct au_vdir *ii_vdir;
};
struct au_icntnr {
struct au_iinfo iinfo;
struct inode vfs_inode;
union {
struct hlist_node plink;
struct llist_node lnode; /* delayed free */
};
} ____cacheline_aligned_in_smp;
/* au_pin flags */
#define AuPin_DI_LOCKED 1
#define AuPin_MNT_WRITE (1 << 1)
#define au_ftest_pin(flags, name) ((flags) & AuPin_##name)
#define au_fset_pin(flags, name) \
do { (flags) |= AuPin_##name; } while (0)
#define au_fclr_pin(flags, name) \
do { (flags) &= ~AuPin_##name; } while (0)
struct au_pin {
/* input */
struct dentry *dentry;
unsigned int udba;
unsigned char lsc_di, lsc_hi, flags;
aufs_bindex_t bindex;
/* output */
struct dentry *parent;
struct au_hinode *hdir;
struct vfsmount *h_mnt;
/* temporary unlock/relock for copyup */
struct dentry *h_dentry, *h_parent;
struct au_branch *br;
struct task_struct *task;
};
void au_pin_hdir_unlock(struct au_pin *p);
int au_pin_hdir_lock(struct au_pin *p);
int au_pin_hdir_relock(struct au_pin *p);
void au_pin_hdir_acquire_nest(struct au_pin *p);
void au_pin_hdir_release(struct au_pin *p);
/* ---------------------------------------------------------------------- */
static inline struct au_iinfo *au_ii(struct inode *inode)
{
BUG_ON(is_bad_inode(inode));
return &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
}
/* ---------------------------------------------------------------------- */
/* inode.c */
struct inode *au_igrab(struct inode *inode);
void au_refresh_iop(struct inode *inode, int force_getattr);
int au_refresh_hinode_self(struct inode *inode);
int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
unsigned int d_type, ino_t *ino);
struct inode *au_new_inode(struct dentry *dentry, int must_new);
int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
struct inode *inode);
int au_test_h_perm(struct inode *h_inode, int mask);
int au_test_h_perm_sio(struct inode *h_inode, int mask);
static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex,
ino_t h_ino, unsigned int d_type, ino_t *ino)
{
#ifdef CONFIG_AUFS_SHWH
return au_ino(sb, bindex, h_ino, d_type, ino);
#else
return 0;
#endif
}
/* i_op.c */
enum {
AuIop_SYMLINK,
AuIop_DIR,
AuIop_OTHER,
AuIop_Last
};
extern struct inode_operations aufs_iop[AuIop_Last],
aufs_iop_nogetattr[AuIop_Last];
/* au_wr_dir flags */
#define AuWrDir_ADD_ENTRY 1
#define AuWrDir_ISDIR (1 << 1)
#define AuWrDir_TMPFILE (1 << 2)
#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name)
#define au_fset_wrdir(flags, name) \
do { (flags) |= AuWrDir_##name; } while (0)
#define au_fclr_wrdir(flags, name) \
do { (flags) &= ~AuWrDir_##name; } while (0)
struct au_wr_dir_args {
aufs_bindex_t force_btgt;
unsigned char flags;
};
int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
struct au_wr_dir_args *args);
struct dentry *au_pinned_h_parent(struct au_pin *pin);
void au_pin_init(struct au_pin *pin, struct dentry *dentry,
aufs_bindex_t bindex, int lsc_di, int lsc_hi,
unsigned int udba, unsigned char flags);
int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
unsigned int udba, unsigned char flags) __must_check;
int au_do_pin(struct au_pin *pin) __must_check;
void au_unpin(struct au_pin *pin);
int au_reval_for_attr(struct dentry *dentry, unsigned int sigen);
#define AuIcpup_DID_CPUP 1
#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name)
#define au_fset_icpup(flags, name) \
do { (flags) |= AuIcpup_##name; } while (0)
#define au_fclr_icpup(flags, name) \
do { (flags) &= ~AuIcpup_##name; } while (0)
struct au_icpup_args {
unsigned char flags;
unsigned char pin_flags;
aufs_bindex_t btgt;
unsigned int udba;
struct au_pin pin;
struct path h_path;
struct inode *h_inode;
};
int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia,
struct au_icpup_args *a);
int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path);
/* i_op_add.c */
int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_parent, int isdir);
int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
dev_t dev);
int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool want_excl);
struct vfsub_aopen_args;
int au_aopen_or_create(struct inode *dir, struct dentry *dentry,
struct vfsub_aopen_args *args);
int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode);
int aufs_link(struct dentry *src_dentry, struct inode *dir,
struct dentry *dentry);
int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
/* i_op_del.c */
int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup);
int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_parent, int isdir);
int aufs_unlink(struct inode *dir, struct dentry *dentry);
int aufs_rmdir(struct inode *dir, struct dentry *dentry);
/* i_op_ren.c */
int au_wbr(struct dentry *dentry, aufs_bindex_t btgt);
int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
struct inode *dir, struct dentry *dentry,
unsigned int flags);
/* iinfo.c */
struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
void au_hiput(struct au_hinode *hinode);
void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
struct dentry *h_wh);
unsigned int au_hi_flags(struct inode *inode, int isdir);
/* hinode flags */
#define AuHi_XINO 1
#define AuHi_HNOTIFY (1 << 1)
#define au_ftest_hi(flags, name) ((flags) & AuHi_##name)
#define au_fset_hi(flags, name) \
do { (flags) |= AuHi_##name; } while (0)
#define au_fclr_hi(flags, name) \
do { (flags) &= ~AuHi_##name; } while (0)
#ifndef CONFIG_AUFS_HNOTIFY
#undef AuHi_HNOTIFY
#define AuHi_HNOTIFY 0
#endif
void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
struct inode *h_inode, unsigned int flags);
void au_update_iigen(struct inode *inode, int half);
void au_update_ibrange(struct inode *inode, int do_put_zero);
void au_icntnr_init_once(void *_c);
void au_hinode_init(struct au_hinode *hinode);
int au_iinfo_init(struct inode *inode);
void au_iinfo_fin(struct inode *inode);
int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink);
#ifdef CONFIG_PROC_FS
/* plink.c */
int au_plink_maint(struct super_block *sb, int flags);
struct au_sbinfo;
void au_plink_maint_leave(struct au_sbinfo *sbinfo);
int au_plink_maint_enter(struct super_block *sb);
#ifdef CONFIG_AUFS_DEBUG
void au_plink_list(struct super_block *sb);
#else
AuStubVoid(au_plink_list, struct super_block *sb)
#endif
int au_plink_test(struct inode *inode);
struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex);
void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
struct dentry *h_dentry);
void au_plink_put(struct super_block *sb, int verbose);
void au_plink_clean(struct super_block *sb, int verbose);
void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
#else
AuStubInt0(au_plink_maint, struct super_block *sb, int flags);
AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo);
AuStubInt0(au_plink_maint_enter, struct super_block *sb);
AuStubVoid(au_plink_list, struct super_block *sb);
AuStubInt0(au_plink_test, struct inode *inode);
AuStub(struct dentry *, au_plink_lkup, return NULL,
struct inode *inode, aufs_bindex_t bindex);
AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex,
struct dentry *h_dentry);
AuStubVoid(au_plink_put, struct super_block *sb, int verbose);
AuStubVoid(au_plink_clean, struct super_block *sb, int verbose);
AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id);
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_AUFS_XATTR
/* xattr.c */
int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags,
unsigned int verbose);
ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size);
void au_xattr_init(struct super_block *sb);
#else
AuStubInt0(au_cpup_xattr, struct dentry *h_dst, struct dentry *h_src,
int ignore_flags, unsigned int verbose);
AuStubVoid(au_xattr_init, struct super_block *sb);
#endif
#ifdef CONFIG_FS_POSIX_ACL
struct posix_acl *aufs_get_acl(struct inode *inode, int type);
int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
#endif
#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL)
enum {
AU_XATTR_SET,
AU_ACL_SET
};
struct au_sxattr {
int type;
union {
struct {
const char *name;
const void *value;
size_t size;
int flags;
} set;
struct {
struct posix_acl *acl;
int type;
} acl_set;
} u;
};
ssize_t au_sxattr(struct dentry *dentry, struct inode *inode,
struct au_sxattr *arg);
#endif
/* ---------------------------------------------------------------------- */
/* lock subclass for iinfo */
enum {
AuLsc_II_CHILD, /* child first */
AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */
AuLsc_II_CHILD3, /* copyup dirs */
AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */
AuLsc_II_PARENT2,
AuLsc_II_PARENT3, /* copyup dirs */
AuLsc_II_NEW_CHILD
};
/*
* ii_read_lock_child, ii_write_lock_child,
* ii_read_lock_child2, ii_write_lock_child2,
* ii_read_lock_child3, ii_write_lock_child3,
* ii_read_lock_parent, ii_write_lock_parent,
* ii_read_lock_parent2, ii_write_lock_parent2,
* ii_read_lock_parent3, ii_write_lock_parent3,
* ii_read_lock_new_child, ii_write_lock_new_child,
*/
#define AuReadLockFunc(name, lsc) \
static inline void ii_read_lock_##name(struct inode *i) \
{ \
au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
}
#define AuWriteLockFunc(name, lsc) \
static inline void ii_write_lock_##name(struct inode *i) \
{ \
au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##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);
AuRWLockFuncs(new_child, NEW_CHILD);
#undef AuReadLockFunc
#undef AuWriteLockFunc
#undef AuRWLockFuncs
/*
* ii_read_unlock, ii_write_unlock, ii_downgrade_lock
*/
AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem);
#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem)
#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem)
/* ---------------------------------------------------------------------- */
static inline void au_icntnr_init(struct au_icntnr *c)
{
#ifdef CONFIG_AUFS_DEBUG
c->vfs_inode.i_mode = 0;
#endif
}
static inline unsigned int au_iigen(struct inode *inode, unsigned int *igflags)
{
unsigned int gen;
struct au_iinfo *iinfo;
struct au_iigen *iigen;
iinfo = au_ii(inode);
iigen = &iinfo->ii_generation;
spin_lock(&iigen->ig_spin);
if (igflags)
*igflags = iigen->ig_flags;
gen = iigen->ig_generation;
spin_unlock(&iigen->ig_spin);
return gen;
}
/* tiny test for inode number */
/* tmpfs generation is too rough */
static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
{
struct au_iinfo *iinfo;
iinfo = au_ii(inode);
AuRwMustAnyLock(&iinfo->ii_rwsem);
return !(iinfo->ii_hsb1 == h_inode->i_sb
&& iinfo->ii_higen == h_inode->i_generation);
}
static inline void au_iigen_dec(struct inode *inode)
{
struct au_iinfo *iinfo;
struct au_iigen *iigen;
iinfo = au_ii(inode);
iigen = &iinfo->ii_generation;
spin_lock(&iigen->ig_spin);
iigen->ig_generation--;
spin_unlock(&iigen->ig_spin);
}
static inline int au_iigen_test(struct inode *inode, unsigned int sigen)
{
int err;
err = 0;
if (unlikely(inode && au_iigen(inode, NULL) != sigen))
err = -EIO;
return err;
}
/* ---------------------------------------------------------------------- */
static inline struct au_hinode *au_hinode(struct au_iinfo *iinfo,
aufs_bindex_t bindex)
{
return iinfo->ii_hinode + bindex;
}
static inline int au_is_bad_inode(struct inode *inode)
{
return !!(is_bad_inode(inode) || !au_hinode(au_ii(inode), 0));
}
static inline aufs_bindex_t au_ii_br_id(struct inode *inode,
aufs_bindex_t bindex)
{
IiMustAnyLock(inode);
return au_hinode(au_ii(inode), bindex)->hi_id;
}
static inline aufs_bindex_t au_ibtop(struct inode *inode)
{
IiMustAnyLock(inode);
return au_ii(inode)->ii_btop;
}
static inline aufs_bindex_t au_ibbot(struct inode *inode)
{
IiMustAnyLock(inode);
return au_ii(inode)->ii_bbot;
}
static inline struct au_vdir *au_ivdir(struct inode *inode)
{
IiMustAnyLock(inode);
return au_ii(inode)->ii_vdir;
}
static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
{
IiMustAnyLock(inode);
return au_hinode(au_ii(inode), bindex)->hi_whdentry;
}
static inline void au_set_ibtop(struct inode *inode, aufs_bindex_t bindex)
{
IiMustWriteLock(inode);
au_ii(inode)->ii_btop = bindex;
}
static inline void au_set_ibbot(struct inode *inode, aufs_bindex_t bindex)
{
IiMustWriteLock(inode);
au_ii(inode)->ii_bbot = bindex;
}
static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
{
IiMustWriteLock(inode);
au_ii(inode)->ii_vdir = vdir;
}
static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
{
IiMustAnyLock(inode);
return au_hinode(au_ii(inode), bindex);
}
/* ---------------------------------------------------------------------- */
static inline struct dentry *au_pinned_parent(struct au_pin *pin)
{
if (pin)
return pin->parent;
return NULL;
}
static inline struct inode *au_pinned_h_dir(struct au_pin *pin)
{
if (pin && pin->hdir)
return pin->hdir->hi_inode;
return NULL;
}
static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin)
{
if (pin)
return pin->hdir;
return NULL;
}
static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry)
{
if (pin)
pin->dentry = dentry;
}
static inline void au_pin_set_parent_lflag(struct au_pin *pin,
unsigned char lflag)
{
if (pin) {
if (lflag)
au_fset_pin(pin->flags, DI_LOCKED);
else
au_fclr_pin(pin->flags, DI_LOCKED);
}
}
#if 0 /* reserved */
static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent)
{
if (pin) {
dput(pin->parent);
pin->parent = dget(parent);
}
}
#endif
/* ---------------------------------------------------------------------- */
struct au_branch;
#ifdef CONFIG_AUFS_HNOTIFY
struct au_hnotify_op {
void (*ctl)(struct au_hinode *hinode, int do_set);
int (*alloc)(struct au_hinode *hinode);
/*
* if it returns true, the the caller should free hinode->hi_notify,
* otherwise ->free() frees it.
*/
int (*free)(struct au_hinode *hinode,
struct au_hnotify *hn) __must_check;
void (*fin)(void);
int (*init)(void);
int (*reset_br)(unsigned int udba, struct au_branch *br, int perm);
void (*fin_br)(struct au_branch *br);
int (*init_br)(struct au_branch *br, int perm);
};
/* hnotify.c */
int au_hn_alloc(struct au_hinode *hinode, struct inode *inode);
void au_hn_free(struct au_hinode *hinode);
void au_hn_ctl(struct au_hinode *hinode, int do_set);
void au_hn_reset(struct inode *inode, unsigned int flags);
int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
struct qstr *h_child_qstr, struct inode *h_child_inode);
int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm);
int au_hnotify_init_br(struct au_branch *br, int perm);
void au_hnotify_fin_br(struct au_branch *br);
int __init au_hnotify_init(void);
void au_hnotify_fin(void);
/* hfsnotify.c */
extern const struct au_hnotify_op au_hnotify_op;
static inline
void au_hn_init(struct au_hinode *hinode)
{
hinode->hi_notify = NULL;
}
static inline struct au_hnotify *au_hn(struct au_hinode *hinode)
{
return hinode->hi_notify;
}
#else
AuStub(int, au_hn_alloc, return -EOPNOTSUPP,
struct au_hinode *hinode __maybe_unused,
struct inode *inode __maybe_unused)
AuStub(struct au_hnotify *, au_hn, return NULL, struct au_hinode *hinode)
AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused)
AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused,
int do_set __maybe_unused)
AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused,
unsigned int flags __maybe_unused)
AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused,
struct au_branch *br __maybe_unused,
int perm __maybe_unused)
AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused,
int perm __maybe_unused)
AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused)
AuStubInt0(__init au_hnotify_init, void)
AuStubVoid(au_hnotify_fin, void)
AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused)
#endif /* CONFIG_AUFS_HNOTIFY */
static inline void au_hn_suspend(struct au_hinode *hdir)
{
au_hn_ctl(hdir, /*do_set*/0);
}
static inline void au_hn_resume(struct au_hinode *hdir)
{
au_hn_ctl(hdir, /*do_set*/1);
}
static inline void au_hn_inode_lock(struct au_hinode *hdir)
{
inode_lock(hdir->hi_inode);
au_hn_suspend(hdir);
}
static inline void au_hn_inode_lock_nested(struct au_hinode *hdir,
unsigned int sc __maybe_unused)
{
inode_lock_nested(hdir->hi_inode, sc);
au_hn_suspend(hdir);
}
static inline void au_hn_inode_unlock(struct au_hinode *hdir)
{
au_hn_resume(hdir);
inode_unlock(hdir->hi_inode);
}
#endif /* __KERNEL__ */
#endif /* __AUFS_INODE_H__ */
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