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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-23 12:33:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-23 12:33:14 -0300
commita700f2d8e79ff80041078f160fe1edccf89b0c66 (patch)
tree070bc692c19c5980c081222a6f7223869b1560f3 /fs/aufs/inode.h
parentd5ad8b932c22e2790c2b27351116de96603df63a (diff)
Linux-libre 4.2.1-gnupck-4.2.1-gnu
Diffstat (limited to 'fs/aufs/inode.h')
-rw-r--r--fs/aufs/inode.h673
1 files changed, 673 insertions, 0 deletions
diff --git a/fs/aufs/inode.h b/fs/aufs/inode.h
new file mode 100644
index 000000000..1b9be356d
--- /dev/null
+++ b/fs/aufs/inode.h
@@ -0,0 +1,673 @@
+/*
+ * Copyright (C) 2005-2015 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
+ struct inode *hn_aufs_inode; /* no get/put */
+#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 {
+ __u32 ig_generation, ig_flags;
+};
+
+struct au_vdir;
+struct au_iinfo {
+ spinlock_t ii_genspin;
+ struct au_iigen ii_generation;
+ struct super_block *ii_hsb1; /* no get/put */
+
+ struct au_rwsem ii_rwsem;
+ aufs_bindex_t ii_bstart, ii_bend;
+ __u32 ii_higen;
+ struct au_hinode *ii_hinode;
+ struct au_vdir *ii_vdir;
+};
+
+struct au_icntnr {
+ struct au_iinfo iinfo;
+ struct inode vfs_inode;
+} ____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_set_owner(struct au_pin *p, struct task_struct *task);
+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)
+{
+ struct au_iinfo *iinfo;
+
+ iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
+ if (iinfo->ii_hinode)
+ return iinfo;
+ return NULL; /* debugging bad_inode case */
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* inode.c */
+struct inode *au_igrab(struct inode *inode);
+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 */
+extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop;
+
+/* 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);
+
+/* 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);
+int au_iinfo_init(struct inode *inode);
+void au_iinfo_fin(struct inode *inode);
+int au_ii_realloc(struct au_iinfo *iinfo, int nbr);
+
+#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);
+ssize_t aufs_getxattr(struct dentry *dentry, const char *name, void *value,
+ size_t size);
+int aufs_setxattr(struct dentry *dentry, const char *name, const void *value,
+ size_t size, int flags);
+int aufs_removexattr(struct dentry *dentry, const char *name);
+
+/* 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_XATTR_REMOVE,
+ AU_ACL_SET
+};
+
+struct au_srxattr {
+ int type;
+ union {
+ struct {
+ const char *name;
+ const void *value;
+ size_t size;
+ int flags;
+ } set;
+ struct {
+ const char *name;
+ } remove;
+ struct {
+ struct posix_acl *acl;
+ int type;
+ } acl_set;
+ } u;
+};
+ssize_t au_srxattr(struct dentry *dentry, struct au_srxattr *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, struct au_iigen *iigen)
+{
+ unsigned int gen;
+ struct au_iinfo *iinfo;
+
+ iinfo = au_ii(inode);
+ spin_lock(&iinfo->ii_genspin);
+ if (iigen)
+ *iigen = iinfo->ii_generation;
+ gen = iinfo->ii_generation.ig_generation;
+ spin_unlock(&iinfo->ii_genspin);
+
+ 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;
+
+ iinfo = au_ii(inode);
+ spin_lock(&iinfo->ii_genspin);
+ iinfo->ii_generation.ig_generation--;
+ spin_unlock(&iinfo->ii_genspin);
+}
+
+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 aufs_bindex_t au_ii_br_id(struct inode *inode,
+ aufs_bindex_t bindex)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_hinode[0 + bindex].hi_id;
+}
+
+static inline aufs_bindex_t au_ibstart(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_bstart;
+}
+
+static inline aufs_bindex_t au_ibend(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_bend;
+}
+
+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_ii(inode)->ii_hinode[0 + bindex].hi_whdentry;
+}
+
+static inline void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustWriteLock(inode);
+ au_ii(inode)->ii_bstart = bindex;
+}
+
+static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustWriteLock(inode);
+ au_ii(inode)->ii_bend = 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_ii(inode)->ii_hinode + 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_imtx_lock(struct au_hinode *hdir)
+{
+ mutex_lock(&hdir->hi_inode->i_mutex);
+ au_hn_suspend(hdir);
+}
+
+static inline void au_hn_imtx_lock_nested(struct au_hinode *hdir,
+ unsigned int sc __maybe_unused)
+{
+ mutex_lock_nested(&hdir->hi_inode->i_mutex, sc);
+ au_hn_suspend(hdir);
+}
+
+static inline void au_hn_imtx_unlock(struct au_hinode *hdir)
+{
+ au_hn_resume(hdir);
+ mutex_unlock(&hdir->hi_inode->i_mutex);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_INODE_H__ */