1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Filesystem access notification for Linux
5 * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
8 #ifndef __LINUX_FSNOTIFY_BACKEND_H
9 #define __LINUX_FSNOTIFY_BACKEND_H
13 #include <linux/idr.h> /* inotify uses this */
14 #include <linux/fs.h> /* struct inode */
15 #include <linux/list.h>
16 #include <linux/path.h> /* struct path */
17 #include <linux/spinlock.h>
18 #include <linux/types.h>
19 #include <linux/atomic.h>
20 #include <linux/user_namespace.h>
21 #include <linux/refcount.h>
22 #include <linux/mempool.h>
25 * IN_* from inotfy.h lines up EXACTLY with FS_*, this is so we can easily
26 * convert between them. dnotify only needs conversion at watch creation
27 * so no perf loss there. fanotify isn't defined yet, so it can use the
28 * wholes if it needs more events.
30 #define FS_ACCESS 0x00000001 /* File was accessed */
31 #define FS_MODIFY 0x00000002 /* File was modified */
32 #define FS_ATTRIB 0x00000004 /* Metadata changed */
33 #define FS_CLOSE_WRITE 0x00000008 /* Writtable file was closed */
34 #define FS_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
35 #define FS_OPEN 0x00000020 /* File was opened */
36 #define FS_MOVED_FROM 0x00000040 /* File was moved from X */
37 #define FS_MOVED_TO 0x00000080 /* File was moved to Y */
38 #define FS_CREATE 0x00000100 /* Subfile was created */
39 #define FS_DELETE 0x00000200 /* Subfile was deleted */
40 #define FS_DELETE_SELF 0x00000400 /* Self was deleted */
41 #define FS_MOVE_SELF 0x00000800 /* Self was moved */
42 #define FS_OPEN_EXEC 0x00001000 /* File was opened for exec */
44 #define FS_UNMOUNT 0x00002000 /* inode on umount fs */
45 #define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
46 #define FS_ERROR 0x00008000 /* Filesystem Error (fanotify) */
49 * FS_IN_IGNORED overloads FS_ERROR. It is only used internally by inotify
50 * which does not support FS_ERROR.
52 #define FS_IN_IGNORED 0x00008000 /* last inotify event here */
54 #define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
55 #define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */
56 #define FS_OPEN_EXEC_PERM 0x00040000 /* open/exec event in a permission hook */
58 #define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
60 * Set on inode mark that cares about things that happen to its children.
61 * Always set for dnotify and inotify.
62 * Set on inode/sb/mount marks that care about parent/name info.
64 #define FS_EVENT_ON_CHILD 0x08000000
66 #define FS_DN_RENAME 0x10000000 /* file renamed */
67 #define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */
68 #define FS_ISDIR 0x40000000 /* event occurred against dir */
69 #define FS_IN_ONESHOT 0x80000000 /* only send event once */
71 #define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
74 * Directory entry modification events - reported only to directory
75 * where entry is modified and not to a watching parent.
76 * The watching parent may get an FS_ATTRIB|FS_EVENT_ON_CHILD event
77 * when a directory entry inside a child subdir changes.
79 #define ALL_FSNOTIFY_DIRENT_EVENTS (FS_CREATE | FS_DELETE | FS_MOVE)
81 #define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
85 * This is a list of all events that may get sent to a parent that is watching
86 * with flag FS_EVENT_ON_CHILD based on fs event on a child of that directory.
88 #define FS_EVENTS_POSS_ON_CHILD (ALL_FSNOTIFY_PERM_EVENTS | \
89 FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
90 FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | \
91 FS_OPEN | FS_OPEN_EXEC)
94 * This is a list of all events that may get sent with the parent inode as the
95 * @to_tell argument of fsnotify().
96 * It may include events that can be sent to an inode/sb/mount mark, but cannot
97 * be sent to a parent watching children.
99 #define FS_EVENTS_POSS_TO_PARENT (FS_EVENTS_POSS_ON_CHILD)
101 /* Events that can be reported to backends */
102 #define ALL_FSNOTIFY_EVENTS (ALL_FSNOTIFY_DIRENT_EVENTS | \
103 FS_EVENTS_POSS_ON_CHILD | \
104 FS_DELETE_SELF | FS_MOVE_SELF | FS_DN_RENAME | \
105 FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
108 /* Extra flags that may be reported with event or control handling of events */
109 #define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
110 FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
112 #define ALL_FSNOTIFY_BITS (ALL_FSNOTIFY_EVENTS | ALL_FSNOTIFY_FLAGS)
114 struct fsnotify_group;
115 struct fsnotify_event;
116 struct fsnotify_mark;
117 struct fsnotify_event_private_data;
118 struct fsnotify_fname;
119 struct fsnotify_iter_info;
124 * Each group much define these ops. The fsnotify infrastructure will call
125 * these operations for each relevant group.
127 * handle_event - main call for a group to handle an fs event
128 * @group: group to notify
129 * @mask: event type and flags
130 * @data: object that event happened on
131 * @data_type: type of object for fanotify_data_XXX() accessors
132 * @dir: optional directory associated with event -
133 * if @file_name is not NULL, this is the directory that
134 * @file_name is relative to
135 * @file_name: optional file name associated with event
136 * @cookie: inotify rename cookie
137 * @iter_info: array of marks from this group that are interested in the event
139 * handle_inode_event - simple variant of handle_event() for groups that only
140 * have inode marks and don't have ignore mask
141 * @mark: mark to notify
142 * @mask: event type and flags
143 * @inode: inode that event happened on
144 * @dir: optional directory associated with event -
145 * if @file_name is not NULL, this is the directory that
146 * @file_name is relative to.
147 * Either @inode or @dir must be non-NULL.
148 * @file_name: optional file name associated with event
149 * @cookie: inotify rename cookie
151 * free_group_priv - called when a group refcnt hits 0 to clean up the private union
152 * freeing_mark - called when a mark is being destroyed for some reason. The group
153 * MUST be holding a reference on each mark and that reference must be
154 * dropped in this function. inotify uses this function to send
155 * userspace messages that marks have been removed.
157 struct fsnotify_ops {
158 int (*handle_event)(struct fsnotify_group *group, u32 mask,
159 const void *data, int data_type, struct inode *dir,
160 const struct qstr *file_name, u32 cookie,
161 struct fsnotify_iter_info *iter_info);
162 int (*handle_inode_event)(struct fsnotify_mark *mark, u32 mask,
163 struct inode *inode, struct inode *dir,
164 const struct qstr *file_name, u32 cookie);
165 void (*free_group_priv)(struct fsnotify_group *group);
166 void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
167 void (*free_event)(struct fsnotify_group *group, struct fsnotify_event *event);
168 /* called on final put+free to free memory */
169 void (*free_mark)(struct fsnotify_mark *mark);
173 * all of the information about the original object we want to now send to
174 * a group. If you want to carry more info from the accessing task to the
175 * listener this structure is where you need to be adding fields.
177 struct fsnotify_event {
178 struct list_head list;
182 * A group is a "thing" that wants to receive notification about filesystem
183 * events. The mask holds the subset of event types this group cares about.
184 * refcnt on a group is up to the implementor and at any moment if it goes 0
185 * everything will be cleaned up.
187 struct fsnotify_group {
188 const struct fsnotify_ops *ops; /* how this group handles things */
191 * How the refcnt is used is up to each group. When the refcnt hits 0
192 * fsnotify will clean up all of the resources associated with this group.
193 * As an example, the dnotify group will always have a refcnt=1 and that
194 * will never change. Inotify, on the other hand, has a group per
195 * inotify_init() and the refcnt will hit 0 only when that fd has been
198 refcount_t refcnt; /* things with interest in this group */
200 /* needed to send notification to userspace */
201 spinlock_t notification_lock; /* protect the notification_list */
202 struct list_head notification_list; /* list of event_holder this group needs to send to userspace */
203 wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */
204 unsigned int q_len; /* events on the queue */
205 unsigned int max_events; /* maximum events allowed on the list */
207 * Valid fsnotify group priorities. Events are send in order from highest
208 * priority to lowest priority. We default to the lowest priority.
210 #define FS_PRIO_0 0 /* normal notifiers, no permissions */
211 #define FS_PRIO_1 1 /* fanotify content based access control */
212 #define FS_PRIO_2 2 /* fanotify pre-content access */
213 unsigned int priority;
214 bool shutdown; /* group is being shut down, don't queue more events */
216 /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */
217 struct mutex mark_mutex; /* protect marks_list */
218 atomic_t user_waits; /* Number of tasks waiting for user
220 struct list_head marks_list; /* all inode marks for this group */
222 struct fasync_struct *fsn_fa; /* async notification */
224 struct fsnotify_event *overflow_event; /* Event we queue when the
225 * notification list is too
228 struct mem_cgroup *memcg; /* memcg to charge allocations */
230 /* groups can define private fields here or use the void *private */
233 #ifdef CONFIG_INOTIFY_USER
234 struct inotify_group_private_data {
237 struct ucounts *ucounts;
240 #ifdef CONFIG_FANOTIFY
241 struct fanotify_group_private_data {
242 /* Hash table of events for merge */
243 struct hlist_head *merge_hash;
244 /* allows a group to block waiting for a userspace response */
245 struct list_head access_list;
246 wait_queue_head_t access_waitq;
247 int flags; /* flags from fanotify_init() */
248 int f_flags; /* event_f_flags from fanotify_init() */
249 struct ucounts *ucounts;
250 mempool_t error_events_pool;
252 #endif /* CONFIG_FANOTIFY */
256 /* When calling fsnotify tell it if the data is a path or inode */
257 enum fsnotify_data_type {
260 FSNOTIFY_EVENT_INODE,
261 FSNOTIFY_EVENT_DENTRY,
262 FSNOTIFY_EVENT_ERROR,
265 struct fs_error_report {
268 struct super_block *sb;
271 static inline struct inode *fsnotify_data_inode(const void *data, int data_type)
274 case FSNOTIFY_EVENT_INODE:
275 return (struct inode *)data;
276 case FSNOTIFY_EVENT_DENTRY:
277 return d_inode(data);
278 case FSNOTIFY_EVENT_PATH:
279 return d_inode(((const struct path *)data)->dentry);
280 case FSNOTIFY_EVENT_ERROR:
281 return ((struct fs_error_report *)data)->inode;
287 static inline struct dentry *fsnotify_data_dentry(const void *data, int data_type)
290 case FSNOTIFY_EVENT_DENTRY:
291 /* Non const is needed for dget() */
292 return (struct dentry *)data;
293 case FSNOTIFY_EVENT_PATH:
294 return ((const struct path *)data)->dentry;
300 static inline const struct path *fsnotify_data_path(const void *data,
304 case FSNOTIFY_EVENT_PATH:
311 static inline struct super_block *fsnotify_data_sb(const void *data,
315 case FSNOTIFY_EVENT_INODE:
316 return ((struct inode *)data)->i_sb;
317 case FSNOTIFY_EVENT_DENTRY:
318 return ((struct dentry *)data)->d_sb;
319 case FSNOTIFY_EVENT_PATH:
320 return ((const struct path *)data)->dentry->d_sb;
321 case FSNOTIFY_EVENT_ERROR:
322 return ((struct fs_error_report *) data)->sb;
328 static inline struct fs_error_report *fsnotify_data_error_report(
333 case FSNOTIFY_EVENT_ERROR:
334 return (struct fs_error_report *) data;
340 enum fsnotify_obj_type {
341 FSNOTIFY_OBJ_TYPE_INODE,
342 FSNOTIFY_OBJ_TYPE_PARENT,
343 FSNOTIFY_OBJ_TYPE_VFSMOUNT,
344 FSNOTIFY_OBJ_TYPE_SB,
345 FSNOTIFY_OBJ_TYPE_COUNT,
346 FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT
349 #define FSNOTIFY_OBJ_TYPE_INODE_FL (1U << FSNOTIFY_OBJ_TYPE_INODE)
350 #define FSNOTIFY_OBJ_TYPE_PARENT_FL (1U << FSNOTIFY_OBJ_TYPE_PARENT)
351 #define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL (1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
352 #define FSNOTIFY_OBJ_TYPE_SB_FL (1U << FSNOTIFY_OBJ_TYPE_SB)
353 #define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
355 static inline bool fsnotify_valid_obj_type(unsigned int type)
357 return (type < FSNOTIFY_OBJ_TYPE_COUNT);
360 struct fsnotify_iter_info {
361 struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT];
362 unsigned int report_mask;
366 static inline bool fsnotify_iter_should_report_type(
367 struct fsnotify_iter_info *iter_info, int type)
369 return (iter_info->report_mask & (1U << type));
372 static inline void fsnotify_iter_set_report_type(
373 struct fsnotify_iter_info *iter_info, int type)
375 iter_info->report_mask |= (1U << type);
378 static inline void fsnotify_iter_set_report_type_mark(
379 struct fsnotify_iter_info *iter_info, int type,
380 struct fsnotify_mark *mark)
382 iter_info->marks[type] = mark;
383 iter_info->report_mask |= (1U << type);
386 #define FSNOTIFY_ITER_FUNCS(name, NAME) \
387 static inline struct fsnotify_mark *fsnotify_iter_##name##_mark( \
388 struct fsnotify_iter_info *iter_info) \
390 return (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_##NAME##_FL) ? \
391 iter_info->marks[FSNOTIFY_OBJ_TYPE_##NAME] : NULL; \
394 FSNOTIFY_ITER_FUNCS(inode, INODE)
395 FSNOTIFY_ITER_FUNCS(parent, PARENT)
396 FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
397 FSNOTIFY_ITER_FUNCS(sb, SB)
399 #define fsnotify_foreach_obj_type(type) \
400 for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
403 * fsnotify_connp_t is what we embed in objects which connector can be attached
404 * to. fsnotify_connp_t * is how we refer from connector back to object.
406 struct fsnotify_mark_connector;
407 typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
410 * Inode/vfsmount/sb point to this structure which tracks all marks attached to
411 * the inode/vfsmount/sb. The reference to inode/vfsmount/sb is held by this
412 * structure. We destroy this structure when there are no more marks attached
413 * to it. The structure is protected by fsnotify_mark_srcu.
415 struct fsnotify_mark_connector {
417 unsigned short type; /* Type of object [lock] */
418 #define FSNOTIFY_CONN_FLAG_HAS_FSID 0x01
419 unsigned short flags; /* flags [lock] */
420 __kernel_fsid_t fsid; /* fsid of filesystem containing object */
422 /* Object pointer [lock] */
423 fsnotify_connp_t *obj;
424 /* Used listing heads to free after srcu period expires */
425 struct fsnotify_mark_connector *destroy_next;
427 struct hlist_head list;
431 * A mark is simply an object attached to an in core inode which allows an
432 * fsnotify listener to indicate they are either no longer interested in events
433 * of a type matching mask or only interested in those events.
435 * These are flushed when an inode is evicted from core and may be flushed
436 * when the inode is modified (as seen by fsnotify_access). Some fsnotify
437 * users (such as dnotify) will flush these when the open fd is closed and not
438 * at inode eviction or modification.
440 * Text in brackets is showing the lock(s) protecting modifications of a
441 * particular entry. obj_lock means either inode->i_lock or
442 * mnt->mnt_root->d_lock depending on the mark type.
444 struct fsnotify_mark {
445 /* Mask this mark is for [mark->lock, group->mark_mutex] */
447 /* We hold one for presence in g_list. Also one ref for each 'thing'
448 * in kernel that found and may be using this mark. */
450 /* Group this mark is for. Set on mark creation, stable until last ref
452 struct fsnotify_group *group;
453 /* List of marks by group->marks_list. Also reused for queueing
454 * mark into destroy_list when it's waiting for the end of SRCU period
455 * before it can be freed. [group->mark_mutex] */
456 struct list_head g_list;
457 /* Protects inode / mnt pointers, flags, masks */
459 /* List of marks for inode / vfsmount [connector->lock, mark ref] */
460 struct hlist_node obj_list;
461 /* Head of list of marks for an object [mark ref] */
462 struct fsnotify_mark_connector *connector;
463 /* Events types to ignore [mark->lock, group->mark_mutex] */
465 #define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01
466 #define FSNOTIFY_MARK_FLAG_ALIVE 0x02
467 #define FSNOTIFY_MARK_FLAG_ATTACHED 0x04
468 unsigned int flags; /* flags [mark->lock] */
471 #ifdef CONFIG_FSNOTIFY
473 /* called from the vfs helpers */
475 /* main fsnotify call to send events */
476 extern int fsnotify(__u32 mask, const void *data, int data_type,
477 struct inode *dir, const struct qstr *name,
478 struct inode *inode, u32 cookie);
479 extern int __fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data,
481 extern void __fsnotify_inode_delete(struct inode *inode);
482 extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
483 extern void fsnotify_sb_delete(struct super_block *sb);
484 extern u32 fsnotify_get_cookie(void);
486 static inline __u32 fsnotify_parent_needed_mask(__u32 mask)
488 /* FS_EVENT_ON_CHILD is set on marks that want parent/name info */
489 if (!(mask & FS_EVENT_ON_CHILD))
492 * This object might be watched by a mark that cares about parent/name
493 * info, does it care about the specific set of events that can be
494 * reported with parent/name info?
496 return mask & FS_EVENTS_POSS_TO_PARENT;
499 static inline int fsnotify_inode_watches_children(struct inode *inode)
501 /* FS_EVENT_ON_CHILD is set if the inode may care */
502 if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD))
504 /* this inode might care about child events, does it care about the
505 * specific set of events that can happen on a child? */
506 return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD;
510 * Update the dentry with a flag indicating the interest of its parent to receive
511 * filesystem events when those events happens to this dentry->d_inode.
513 static inline void fsnotify_update_flags(struct dentry *dentry)
515 assert_spin_locked(&dentry->d_lock);
518 * Serialisation of setting PARENT_WATCHED on the dentries is provided
519 * by d_lock. If inotify_inode_watched changes after we have taken
520 * d_lock, the following __fsnotify_update_child_dentry_flags call will
521 * find our entry, so it will spin until we complete here, and update
522 * us with the new state.
524 if (fsnotify_inode_watches_children(dentry->d_parent->d_inode))
525 dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
527 dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
530 /* called from fsnotify listeners, such as fanotify or dnotify */
532 /* create a new group */
533 extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
534 extern struct fsnotify_group *fsnotify_alloc_user_group(const struct fsnotify_ops *ops);
535 /* get reference to a group */
536 extern void fsnotify_get_group(struct fsnotify_group *group);
537 /* drop reference on a group from fsnotify_alloc_group */
538 extern void fsnotify_put_group(struct fsnotify_group *group);
539 /* group destruction begins, stop queuing new events */
540 extern void fsnotify_group_stop_queueing(struct fsnotify_group *group);
542 extern void fsnotify_destroy_group(struct fsnotify_group *group);
543 /* fasync handler function */
544 extern int fsnotify_fasync(int fd, struct file *file, int on);
545 /* Free event from memory */
546 extern void fsnotify_destroy_event(struct fsnotify_group *group,
547 struct fsnotify_event *event);
548 /* attach the event to the group notification queue */
549 extern int fsnotify_insert_event(struct fsnotify_group *group,
550 struct fsnotify_event *event,
551 int (*merge)(struct fsnotify_group *,
552 struct fsnotify_event *),
553 void (*insert)(struct fsnotify_group *,
554 struct fsnotify_event *));
556 static inline int fsnotify_add_event(struct fsnotify_group *group,
557 struct fsnotify_event *event,
558 int (*merge)(struct fsnotify_group *,
559 struct fsnotify_event *))
561 return fsnotify_insert_event(group, event, merge, NULL);
564 /* Queue overflow event to a notification group */
565 static inline void fsnotify_queue_overflow(struct fsnotify_group *group)
567 fsnotify_add_event(group, group->overflow_event, NULL);
570 static inline bool fsnotify_is_overflow_event(u32 mask)
572 return mask & FS_Q_OVERFLOW;
575 static inline bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group)
577 assert_spin_locked(&group->notification_lock);
579 return list_empty(&group->notification_list);
582 extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
583 /* return, but do not dequeue the first event on the notification queue */
584 extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group);
585 /* return AND dequeue the first event on the notification queue */
586 extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group);
587 /* Remove event queued in the notification list */
588 extern void fsnotify_remove_queued_event(struct fsnotify_group *group,
589 struct fsnotify_event *event);
591 /* functions used to manipulate the marks attached to inodes */
593 /* Get mask of events for a list of marks */
594 extern __u32 fsnotify_conn_mask(struct fsnotify_mark_connector *conn);
595 /* Calculate mask of events for a list of marks */
596 extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
597 extern void fsnotify_init_mark(struct fsnotify_mark *mark,
598 struct fsnotify_group *group);
599 /* Find mark belonging to given group in the list of marks */
600 extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp,
601 struct fsnotify_group *group);
602 /* Get cached fsid of filesystem containing object */
603 extern int fsnotify_get_conn_fsid(const struct fsnotify_mark_connector *conn,
604 __kernel_fsid_t *fsid);
605 /* attach the mark to the object */
606 extern int fsnotify_add_mark(struct fsnotify_mark *mark,
607 fsnotify_connp_t *connp, unsigned int type,
608 int allow_dups, __kernel_fsid_t *fsid);
609 extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
610 fsnotify_connp_t *connp,
611 unsigned int type, int allow_dups,
612 __kernel_fsid_t *fsid);
614 /* attach the mark to the inode */
615 static inline int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
619 return fsnotify_add_mark(mark, &inode->i_fsnotify_marks,
620 FSNOTIFY_OBJ_TYPE_INODE, allow_dups, NULL);
622 static inline int fsnotify_add_inode_mark_locked(struct fsnotify_mark *mark,
626 return fsnotify_add_mark_locked(mark, &inode->i_fsnotify_marks,
627 FSNOTIFY_OBJ_TYPE_INODE, allow_dups,
631 /* given a group and a mark, flag mark to be freed when all references are dropped */
632 extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
633 struct fsnotify_group *group);
634 /* detach mark from inode / mount list, group list, drop inode reference */
635 extern void fsnotify_detach_mark(struct fsnotify_mark *mark);
637 extern void fsnotify_free_mark(struct fsnotify_mark *mark);
638 /* Wait until all marks queued for destruction are destroyed */
639 extern void fsnotify_wait_marks_destroyed(void);
640 /* run all the marks in a group, and clear all of the marks attached to given object type */
641 extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type);
642 /* run all the marks in a group, and clear all of the vfsmount marks */
643 static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
645 fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL);
647 /* run all the marks in a group, and clear all of the inode marks */
648 static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
650 fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL);
652 /* run all the marks in a group, and clear all of the sn marks */
653 static inline void fsnotify_clear_sb_marks_by_group(struct fsnotify_group *group)
655 fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_SB_FL);
657 extern void fsnotify_get_mark(struct fsnotify_mark *mark);
658 extern void fsnotify_put_mark(struct fsnotify_mark *mark);
659 extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
660 extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
662 static inline void fsnotify_init_event(struct fsnotify_event *event)
664 INIT_LIST_HEAD(&event->list);
669 static inline int fsnotify(__u32 mask, const void *data, int data_type,
670 struct inode *dir, const struct qstr *name,
671 struct inode *inode, u32 cookie)
676 static inline int __fsnotify_parent(struct dentry *dentry, __u32 mask,
677 const void *data, int data_type)
682 static inline void __fsnotify_inode_delete(struct inode *inode)
685 static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
688 static inline void fsnotify_sb_delete(struct super_block *sb)
691 static inline void fsnotify_update_flags(struct dentry *dentry)
694 static inline u32 fsnotify_get_cookie(void)
699 static inline void fsnotify_unmount_inodes(struct super_block *sb)
702 #endif /* CONFIG_FSNOTIFY */
704 #endif /* __KERNEL __ */
706 #endif /* __LINUX_FSNOTIFY_BACKEND_H */