diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 5433e37fb0c5..8c7cbac7183c 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -107,6 +107,47 @@ void fsnotify_sb_delete(struct super_block *sb) fsnotify_clear_marks_by_sb(sb); } +/* + * fsnotify_nameremove - a filename was removed from a directory + * + * This is mostly called under parent vfs inode lock so name and + * dentry->d_parent should be stable. However there are some corner cases where + * inode lock is not held. So to be on the safe side and be reselient to future + * callers and out of tree users of d_delete(), we do not assume that d_parent + * and d_name are stable and we use dget_parent() and + * take_dentry_name_snapshot() to grab stable references. + */ +void fsnotify_nameremove(struct dentry *dentry, int isdir) +{ + struct dentry *parent; + struct name_snapshot name; + __u32 mask = FS_DELETE; + + /* d_delete() of pseudo inode? (e.g. __ns_get_path() playing tricks) */ + if (IS_ROOT(dentry)) + return; + + if (isdir) + mask |= FS_ISDIR; + + parent = dget_parent(dentry); + /* Avoid unneeded take_dentry_name_snapshot() */ + if (!(d_inode(parent)->i_fsnotify_mask & FS_DELETE) && + !(dentry->d_sb->s_fsnotify_mask & FS_DELETE)) + goto out_dput; + + take_dentry_name_snapshot(&name, dentry); + + fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE, + &name.name, 0); + + release_dentry_name_snapshot(&name); + +out_dput: + dput(parent); +} +EXPORT_SYMBOL(fsnotify_nameremove); + /* * Given an inode, first check if we care what happens to our children. Inotify * and dnotify both tell their parents about events. If we care about any event diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 22acb0a79b53..b251105f646f 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -619,6 +619,11 @@ restart: /* mark should be the last entry. last is the current last entry */ hlist_add_behind_rcu(&mark->obj_list, &last->obj_list); added: + /* + * Since connector is attached to object using cmpxchg() we are + * guaranteed that connector initialization is fully visible by anyone + * seeing mark->connector set. + */ WRITE_ONCE(mark->connector, conn); out_err: spin_unlock(&conn->lock); diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h index 0c0ef3078a22..94972e8eb6d1 100644 --- a/include/linux/fsnotify.h +++ b/include/linux/fsnotify.h @@ -151,39 +151,6 @@ static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt) __fsnotify_vfsmount_delete(mnt); } -/* - * fsnotify_nameremove - a filename was removed from a directory - * - * This is mostly called under parent vfs inode lock so name and - * dentry->d_parent should be stable. However there are some corner cases where - * inode lock is not held. So to be on the safe side and be reselient to future - * callers and out of tree users of d_delete(), we do not assume that d_parent - * and d_name are stable and we use dget_parent() and - * take_dentry_name_snapshot() to grab stable references. - */ -static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) -{ - struct dentry *parent; - struct name_snapshot name; - __u32 mask = FS_DELETE; - - /* d_delete() of pseudo inode? (e.g. __ns_get_path() playing tricks) */ - if (IS_ROOT(dentry)) - return; - - if (isdir) - mask |= FS_ISDIR; - - parent = dget_parent(dentry); - take_dentry_name_snapshot(&name, dentry); - - fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE, - &name.name, 0); - - release_dentry_name_snapshot(&name); - dput(parent); -} - /* * fsnotify_inoderemove - an inode is going away */ diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index c28f6ed1f59b..a9f9dcc1e515 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -355,6 +355,7 @@ extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u extern void __fsnotify_inode_delete(struct inode *inode); extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt); extern void fsnotify_sb_delete(struct super_block *sb); +extern void fsnotify_nameremove(struct dentry *dentry, int isdir); extern u32 fsnotify_get_cookie(void); static inline int fsnotify_inode_watches_children(struct inode *inode) @@ -524,6 +525,9 @@ static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt) static inline void fsnotify_sb_delete(struct super_block *sb) {} +static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) +{} + static inline void fsnotify_update_flags(struct dentry *dentry) {}