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1 : : /* SPDX-License-Identifier: GPL-2.0 */
2 : : /*
3 : : * Filesystem access notification for Linux
4 : : *
5 : : * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
6 : : */
7 : :
8 : : #ifndef __LINUX_FSNOTIFY_BACKEND_H
9 : : #define __LINUX_FSNOTIFY_BACKEND_H
10 : :
11 : : #ifdef __KERNEL__
12 : :
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 : :
23 : : /*
24 : : * IN_* from inotfy.h lines up EXACTLY with FS_*, this is so we can easily
25 : : * convert between them. dnotify only needs conversion at watch creation
26 : : * so no perf loss there. fanotify isn't defined yet, so it can use the
27 : : * wholes if it needs more events.
28 : : */
29 : : #define FS_ACCESS 0x00000001 /* File was accessed */
30 : : #define FS_MODIFY 0x00000002 /* File was modified */
31 : : #define FS_ATTRIB 0x00000004 /* Metadata changed */
32 : : #define FS_CLOSE_WRITE 0x00000008 /* Writtable file was closed */
33 : : #define FS_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
34 : : #define FS_OPEN 0x00000020 /* File was opened */
35 : : #define FS_MOVED_FROM 0x00000040 /* File was moved from X */
36 : : #define FS_MOVED_TO 0x00000080 /* File was moved to Y */
37 : : #define FS_CREATE 0x00000100 /* Subfile was created */
38 : : #define FS_DELETE 0x00000200 /* Subfile was deleted */
39 : : #define FS_DELETE_SELF 0x00000400 /* Self was deleted */
40 : : #define FS_MOVE_SELF 0x00000800 /* Self was moved */
41 : : #define FS_OPEN_EXEC 0x00001000 /* File was opened for exec */
42 : :
43 : : #define FS_UNMOUNT 0x00002000 /* inode on umount fs */
44 : : #define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
45 : : #define FS_IN_IGNORED 0x00008000 /* last inotify event here */
46 : :
47 : : #define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
48 : : #define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */
49 : : #define FS_OPEN_EXEC_PERM 0x00040000 /* open/exec event in a permission hook */
50 : :
51 : : #define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
52 : : #define FS_ISDIR 0x40000000 /* event occurred against dir */
53 : : #define FS_IN_ONESHOT 0x80000000 /* only send event once */
54 : :
55 : : #define FS_DN_RENAME 0x10000000 /* file renamed */
56 : : #define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */
57 : :
58 : : /* This inode cares about things that happen to its children. Always set for
59 : : * dnotify and inotify. */
60 : : #define FS_EVENT_ON_CHILD 0x08000000
61 : :
62 : : #define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
63 : :
64 : : /*
65 : : * Directory entry modification events - reported only to directory
66 : : * where entry is modified and not to a watching parent.
67 : : * The watching parent may get an FS_ATTRIB|FS_EVENT_ON_CHILD event
68 : : * when a directory entry inside a child subdir changes.
69 : : */
70 : : #define ALL_FSNOTIFY_DIRENT_EVENTS (FS_CREATE | FS_DELETE | FS_MOVE)
71 : :
72 : : #define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
73 : : FS_OPEN_EXEC_PERM)
74 : :
75 : : /*
76 : : * This is a list of all events that may get sent to a parent based on fs event
77 : : * happening to inodes inside that directory.
78 : : */
79 : : #define FS_EVENTS_POSS_ON_CHILD (ALL_FSNOTIFY_PERM_EVENTS | \
80 : : FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
81 : : FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | \
82 : : FS_OPEN | FS_OPEN_EXEC)
83 : :
84 : : /* Events that can be reported to backends */
85 : : #define ALL_FSNOTIFY_EVENTS (ALL_FSNOTIFY_DIRENT_EVENTS | \
86 : : FS_EVENTS_POSS_ON_CHILD | \
87 : : FS_DELETE_SELF | FS_MOVE_SELF | FS_DN_RENAME | \
88 : : FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED)
89 : :
90 : : /* Extra flags that may be reported with event or control handling of events */
91 : : #define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
92 : : FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
93 : :
94 : : #define ALL_FSNOTIFY_BITS (ALL_FSNOTIFY_EVENTS | ALL_FSNOTIFY_FLAGS)
95 : :
96 : : struct fsnotify_group;
97 : : struct fsnotify_event;
98 : : struct fsnotify_mark;
99 : : struct fsnotify_event_private_data;
100 : : struct fsnotify_fname;
101 : : struct fsnotify_iter_info;
102 : :
103 : : struct mem_cgroup;
104 : :
105 : : /*
106 : : * Each group much define these ops. The fsnotify infrastructure will call
107 : : * these operations for each relevant group.
108 : : *
109 : : * handle_event - main call for a group to handle an fs event
110 : : * free_group_priv - called when a group refcnt hits 0 to clean up the private union
111 : : * freeing_mark - called when a mark is being destroyed for some reason. The group
112 : : * MUST be holding a reference on each mark and that reference must be
113 : : * dropped in this function. inotify uses this function to send
114 : : * userspace messages that marks have been removed.
115 : : */
116 : : struct fsnotify_ops {
117 : : int (*handle_event)(struct fsnotify_group *group,
118 : : struct inode *inode,
119 : : u32 mask, const void *data, int data_type,
120 : : const struct qstr *file_name, u32 cookie,
121 : : struct fsnotify_iter_info *iter_info);
122 : : void (*free_group_priv)(struct fsnotify_group *group);
123 : : void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
124 : : void (*free_event)(struct fsnotify_event *event);
125 : : /* called on final put+free to free memory */
126 : : void (*free_mark)(struct fsnotify_mark *mark);
127 : : };
128 : :
129 : : /*
130 : : * all of the information about the original object we want to now send to
131 : : * a group. If you want to carry more info from the accessing task to the
132 : : * listener this structure is where you need to be adding fields.
133 : : */
134 : : struct fsnotify_event {
135 : : struct list_head list;
136 : : unsigned long objectid; /* identifier for queue merges */
137 : : };
138 : :
139 : : /*
140 : : * A group is a "thing" that wants to receive notification about filesystem
141 : : * events. The mask holds the subset of event types this group cares about.
142 : : * refcnt on a group is up to the implementor and at any moment if it goes 0
143 : : * everything will be cleaned up.
144 : : */
145 : : struct fsnotify_group {
146 : : const struct fsnotify_ops *ops; /* how this group handles things */
147 : :
148 : : /*
149 : : * How the refcnt is used is up to each group. When the refcnt hits 0
150 : : * fsnotify will clean up all of the resources associated with this group.
151 : : * As an example, the dnotify group will always have a refcnt=1 and that
152 : : * will never change. Inotify, on the other hand, has a group per
153 : : * inotify_init() and the refcnt will hit 0 only when that fd has been
154 : : * closed.
155 : : */
156 : : refcount_t refcnt; /* things with interest in this group */
157 : :
158 : : /* needed to send notification to userspace */
159 : : spinlock_t notification_lock; /* protect the notification_list */
160 : : struct list_head notification_list; /* list of event_holder this group needs to send to userspace */
161 : : wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */
162 : : unsigned int q_len; /* events on the queue */
163 : : unsigned int max_events; /* maximum events allowed on the list */
164 : : /*
165 : : * Valid fsnotify group priorities. Events are send in order from highest
166 : : * priority to lowest priority. We default to the lowest priority.
167 : : */
168 : : #define FS_PRIO_0 0 /* normal notifiers, no permissions */
169 : : #define FS_PRIO_1 1 /* fanotify content based access control */
170 : : #define FS_PRIO_2 2 /* fanotify pre-content access */
171 : : unsigned int priority;
172 : : bool shutdown; /* group is being shut down, don't queue more events */
173 : :
174 : : /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */
175 : : struct mutex mark_mutex; /* protect marks_list */
176 : : atomic_t num_marks; /* 1 for each mark and 1 for not being
177 : : * past the point of no return when freeing
178 : : * a group */
179 : : atomic_t user_waits; /* Number of tasks waiting for user
180 : : * response */
181 : : struct list_head marks_list; /* all inode marks for this group */
182 : :
183 : : struct fasync_struct *fsn_fa; /* async notification */
184 : :
185 : : struct fsnotify_event *overflow_event; /* Event we queue when the
186 : : * notification list is too
187 : : * full */
188 : :
189 : : struct mem_cgroup *memcg; /* memcg to charge allocations */
190 : :
191 : : /* groups can define private fields here or use the void *private */
192 : : union {
193 : : void *private;
194 : : #ifdef CONFIG_INOTIFY_USER
195 : : struct inotify_group_private_data {
196 : : spinlock_t idr_lock;
197 : : struct idr idr;
198 : : struct ucounts *ucounts;
199 : : } inotify_data;
200 : : #endif
201 : : #ifdef CONFIG_FANOTIFY
202 : : struct fanotify_group_private_data {
203 : : /* allows a group to block waiting for a userspace response */
204 : : struct list_head access_list;
205 : : wait_queue_head_t access_waitq;
206 : : int flags; /* flags from fanotify_init() */
207 : : int f_flags; /* event_f_flags from fanotify_init() */
208 : : unsigned int max_marks;
209 : : struct user_struct *user;
210 : : } fanotify_data;
211 : : #endif /* CONFIG_FANOTIFY */
212 : : };
213 : : };
214 : :
215 : : /* when calling fsnotify tell it if the data is a path or inode */
216 : : #define FSNOTIFY_EVENT_NONE 0
217 : : #define FSNOTIFY_EVENT_PATH 1
218 : : #define FSNOTIFY_EVENT_INODE 2
219 : :
220 : : enum fsnotify_obj_type {
221 : : FSNOTIFY_OBJ_TYPE_INODE,
222 : : FSNOTIFY_OBJ_TYPE_VFSMOUNT,
223 : : FSNOTIFY_OBJ_TYPE_SB,
224 : : FSNOTIFY_OBJ_TYPE_COUNT,
225 : : FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT
226 : : };
227 : :
228 : : #define FSNOTIFY_OBJ_TYPE_INODE_FL (1U << FSNOTIFY_OBJ_TYPE_INODE)
229 : : #define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL (1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
230 : : #define FSNOTIFY_OBJ_TYPE_SB_FL (1U << FSNOTIFY_OBJ_TYPE_SB)
231 : : #define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
232 : :
233 : : static inline bool fsnotify_valid_obj_type(unsigned int type)
234 : : {
235 : : return (type < FSNOTIFY_OBJ_TYPE_COUNT);
236 : : }
237 : :
238 : : struct fsnotify_iter_info {
239 : : struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT];
240 : : unsigned int report_mask;
241 : : int srcu_idx;
242 : : };
243 : :
244 : : static inline bool fsnotify_iter_should_report_type(
245 : : struct fsnotify_iter_info *iter_info, int type)
246 : : {
247 : 283608 : return (iter_info->report_mask & (1U << type));
248 : : }
249 : :
250 : : static inline void fsnotify_iter_set_report_type(
251 : : struct fsnotify_iter_info *iter_info, int type)
252 : : {
253 : 33898 : iter_info->report_mask |= (1U << type);
254 : : }
255 : :
256 : : static inline void fsnotify_iter_set_report_type_mark(
257 : : struct fsnotify_iter_info *iter_info, int type,
258 : : struct fsnotify_mark *mark)
259 : : {
260 : 9755 : iter_info->marks[type] = mark;
261 : 9755 : iter_info->report_mask |= (1U << type);
262 : : }
263 : :
264 : : #define FSNOTIFY_ITER_FUNCS(name, NAME) \
265 : : static inline struct fsnotify_mark *fsnotify_iter_##name##_mark( \
266 : : struct fsnotify_iter_info *iter_info) \
267 : : { \
268 : : return (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_##NAME##_FL) ? \
269 : : iter_info->marks[FSNOTIFY_OBJ_TYPE_##NAME] : NULL; \
270 : : }
271 : :
272 [ + - ]: 41985 : FSNOTIFY_ITER_FUNCS(inode, INODE)
273 [ - + ]: 41985 : FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
274 : : FSNOTIFY_ITER_FUNCS(sb, SB)
275 : :
276 : : #define fsnotify_foreach_obj_type(type) \
277 : : for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
278 : :
279 : : /*
280 : : * fsnotify_connp_t is what we embed in objects which connector can be attached
281 : : * to. fsnotify_connp_t * is how we refer from connector back to object.
282 : : */
283 : : struct fsnotify_mark_connector;
284 : : typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
285 : :
286 : : /*
287 : : * Inode/vfsmount/sb point to this structure which tracks all marks attached to
288 : : * the inode/vfsmount/sb. The reference to inode/vfsmount/sb is held by this
289 : : * structure. We destroy this structure when there are no more marks attached
290 : : * to it. The structure is protected by fsnotify_mark_srcu.
291 : : */
292 : : struct fsnotify_mark_connector {
293 : : spinlock_t lock;
294 : : unsigned short type; /* Type of object [lock] */
295 : : #define FSNOTIFY_CONN_FLAG_HAS_FSID 0x01
296 : : unsigned short flags; /* flags [lock] */
297 : : __kernel_fsid_t fsid; /* fsid of filesystem containing object */
298 : : union {
299 : : /* Object pointer [lock] */
300 : : fsnotify_connp_t *obj;
301 : : /* Used listing heads to free after srcu period expires */
302 : : struct fsnotify_mark_connector *destroy_next;
303 : : };
304 : : struct hlist_head list;
305 : : };
306 : :
307 : : /*
308 : : * A mark is simply an object attached to an in core inode which allows an
309 : : * fsnotify listener to indicate they are either no longer interested in events
310 : : * of a type matching mask or only interested in those events.
311 : : *
312 : : * These are flushed when an inode is evicted from core and may be flushed
313 : : * when the inode is modified (as seen by fsnotify_access). Some fsnotify
314 : : * users (such as dnotify) will flush these when the open fd is closed and not
315 : : * at inode eviction or modification.
316 : : *
317 : : * Text in brackets is showing the lock(s) protecting modifications of a
318 : : * particular entry. obj_lock means either inode->i_lock or
319 : : * mnt->mnt_root->d_lock depending on the mark type.
320 : : */
321 : : struct fsnotify_mark {
322 : : /* Mask this mark is for [mark->lock, group->mark_mutex] */
323 : : __u32 mask;
324 : : /* We hold one for presence in g_list. Also one ref for each 'thing'
325 : : * in kernel that found and may be using this mark. */
326 : : refcount_t refcnt;
327 : : /* Group this mark is for. Set on mark creation, stable until last ref
328 : : * is dropped */
329 : : struct fsnotify_group *group;
330 : : /* List of marks by group->marks_list. Also reused for queueing
331 : : * mark into destroy_list when it's waiting for the end of SRCU period
332 : : * before it can be freed. [group->mark_mutex] */
333 : : struct list_head g_list;
334 : : /* Protects inode / mnt pointers, flags, masks */
335 : : spinlock_t lock;
336 : : /* List of marks for inode / vfsmount [connector->lock, mark ref] */
337 : : struct hlist_node obj_list;
338 : : /* Head of list of marks for an object [mark ref] */
339 : : struct fsnotify_mark_connector *connector;
340 : : /* Events types to ignore [mark->lock, group->mark_mutex] */
341 : : __u32 ignored_mask;
342 : : #define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01
343 : : #define FSNOTIFY_MARK_FLAG_ALIVE 0x02
344 : : #define FSNOTIFY_MARK_FLAG_ATTACHED 0x04
345 : : unsigned int flags; /* flags [mark->lock] */
346 : : };
347 : :
348 : : #ifdef CONFIG_FSNOTIFY
349 : :
350 : : /* called from the vfs helpers */
351 : :
352 : : /* main fsnotify call to send events */
353 : : extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
354 : : const struct qstr *name, u32 cookie);
355 : : extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask);
356 : : extern void __fsnotify_inode_delete(struct inode *inode);
357 : : extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
358 : : extern void fsnotify_sb_delete(struct super_block *sb);
359 : : extern u32 fsnotify_get_cookie(void);
360 : :
361 : : static inline int fsnotify_inode_watches_children(struct inode *inode)
362 : : {
363 : : /* FS_EVENT_ON_CHILD is set if the inode may care */
364 [ + + + - ]: 8419272 : if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD))
365 : : return 0;
366 : : /* this inode might care about child events, does it care about the
367 : : * specific set of events that can happen on a child? */
368 : 2094403 : return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD;
369 : : }
370 : :
371 : : /*
372 : : * Update the dentry with a flag indicating the interest of its parent to receive
373 : : * filesystem events when those events happens to this dentry->d_inode.
374 : : */
375 : 6380639 : static inline void fsnotify_update_flags(struct dentry *dentry)
376 : : {
377 [ - + ]: 6380639 : assert_spin_locked(&dentry->d_lock);
378 : :
379 : : /*
380 : : * Serialisation of setting PARENT_WATCHED on the dentries is provided
381 : : * by d_lock. If inotify_inode_watched changes after we have taken
382 : : * d_lock, the following __fsnotify_update_child_dentry_flags call will
383 : : * find our entry, so it will spin until we complete here, and update
384 : : * us with the new state.
385 : : */
386 [ + + ]: 12761278 : if (fsnotify_inode_watches_children(dentry->d_parent->d_inode))
387 : 37133 : dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
388 : : else
389 : 6343506 : dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
390 : 6380639 : }
391 : :
392 : : /* called from fsnotify listeners, such as fanotify or dnotify */
393 : :
394 : : /* create a new group */
395 : : extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
396 : : /* get reference to a group */
397 : : extern void fsnotify_get_group(struct fsnotify_group *group);
398 : : /* drop reference on a group from fsnotify_alloc_group */
399 : : extern void fsnotify_put_group(struct fsnotify_group *group);
400 : : /* group destruction begins, stop queuing new events */
401 : : extern void fsnotify_group_stop_queueing(struct fsnotify_group *group);
402 : : /* destroy group */
403 : : extern void fsnotify_destroy_group(struct fsnotify_group *group);
404 : : /* fasync handler function */
405 : : extern int fsnotify_fasync(int fd, struct file *file, int on);
406 : : /* Free event from memory */
407 : : extern void fsnotify_destroy_event(struct fsnotify_group *group,
408 : : struct fsnotify_event *event);
409 : : /* attach the event to the group notification queue */
410 : : extern int fsnotify_add_event(struct fsnotify_group *group,
411 : : struct fsnotify_event *event,
412 : : int (*merge)(struct list_head *,
413 : : struct fsnotify_event *));
414 : : /* Queue overflow event to a notification group */
415 : : static inline void fsnotify_queue_overflow(struct fsnotify_group *group)
416 : : {
417 : 0 : fsnotify_add_event(group, group->overflow_event, NULL);
418 : : }
419 : :
420 : : /* true if the group notification queue is empty */
421 : : extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
422 : : /* return, but do not dequeue the first event on the notification queue */
423 : : extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group);
424 : : /* return AND dequeue the first event on the notification queue */
425 : : extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group);
426 : : /* Remove event queued in the notification list */
427 : : extern void fsnotify_remove_queued_event(struct fsnotify_group *group,
428 : : struct fsnotify_event *event);
429 : :
430 : : /* functions used to manipulate the marks attached to inodes */
431 : :
432 : : /* Get mask of events for a list of marks */
433 : : extern __u32 fsnotify_conn_mask(struct fsnotify_mark_connector *conn);
434 : : /* Calculate mask of events for a list of marks */
435 : : extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
436 : : extern void fsnotify_init_mark(struct fsnotify_mark *mark,
437 : : struct fsnotify_group *group);
438 : : /* Find mark belonging to given group in the list of marks */
439 : : extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp,
440 : : struct fsnotify_group *group);
441 : : /* Get cached fsid of filesystem containing object */
442 : : extern int fsnotify_get_conn_fsid(const struct fsnotify_mark_connector *conn,
443 : : __kernel_fsid_t *fsid);
444 : : /* attach the mark to the object */
445 : : extern int fsnotify_add_mark(struct fsnotify_mark *mark,
446 : : fsnotify_connp_t *connp, unsigned int type,
447 : : int allow_dups, __kernel_fsid_t *fsid);
448 : : extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
449 : : fsnotify_connp_t *connp,
450 : : unsigned int type, int allow_dups,
451 : : __kernel_fsid_t *fsid);
452 : :
453 : : /* attach the mark to the inode */
454 : : static inline int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
455 : : struct inode *inode,
456 : : int allow_dups)
457 : : {
458 : 0 : return fsnotify_add_mark(mark, &inode->i_fsnotify_marks,
459 : : FSNOTIFY_OBJ_TYPE_INODE, allow_dups, NULL);
460 : : }
461 : : static inline int fsnotify_add_inode_mark_locked(struct fsnotify_mark *mark,
462 : : struct inode *inode,
463 : : int allow_dups)
464 : : {
465 : 35008 : return fsnotify_add_mark_locked(mark, &inode->i_fsnotify_marks,
466 : : FSNOTIFY_OBJ_TYPE_INODE, allow_dups,
467 : : NULL);
468 : : }
469 : :
470 : : /* given a group and a mark, flag mark to be freed when all references are dropped */
471 : : extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
472 : : struct fsnotify_group *group);
473 : : /* detach mark from inode / mount list, group list, drop inode reference */
474 : : extern void fsnotify_detach_mark(struct fsnotify_mark *mark);
475 : : /* free mark */
476 : : extern void fsnotify_free_mark(struct fsnotify_mark *mark);
477 : : /* Wait until all marks queued for destruction are destroyed */
478 : : extern void fsnotify_wait_marks_destroyed(void);
479 : : /* run all the marks in a group, and clear all of the marks attached to given object type */
480 : : extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type);
481 : : /* run all the marks in a group, and clear all of the vfsmount marks */
482 : : static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
483 : : {
484 : 0 : fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL);
485 : : }
486 : : /* run all the marks in a group, and clear all of the inode marks */
487 : : static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
488 : : {
489 : 0 : fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL);
490 : : }
491 : : /* run all the marks in a group, and clear all of the sn marks */
492 : : static inline void fsnotify_clear_sb_marks_by_group(struct fsnotify_group *group)
493 : : {
494 : 0 : fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_SB_FL);
495 : : }
496 : : extern void fsnotify_get_mark(struct fsnotify_mark *mark);
497 : : extern void fsnotify_put_mark(struct fsnotify_mark *mark);
498 : : extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
499 : : extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
500 : :
501 : : static inline void fsnotify_init_event(struct fsnotify_event *event,
502 : : unsigned long objectid)
503 : : {
504 : 49023 : INIT_LIST_HEAD(&event->list);
505 : 49023 : event->objectid = objectid;
506 : : }
507 : :
508 : : #else
509 : :
510 : : static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
511 : : const struct qstr *name, u32 cookie)
512 : : {
513 : : return 0;
514 : : }
515 : :
516 : : static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
517 : : {
518 : : return 0;
519 : : }
520 : :
521 : : static inline void __fsnotify_inode_delete(struct inode *inode)
522 : : {}
523 : :
524 : : static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
525 : : {}
526 : :
527 : : static inline void fsnotify_sb_delete(struct super_block *sb)
528 : : {}
529 : :
530 : : static inline void fsnotify_update_flags(struct dentry *dentry)
531 : : {}
532 : :
533 : : static inline u32 fsnotify_get_cookie(void)
534 : : {
535 : : return 0;
536 : : }
537 : :
538 : : static inline void fsnotify_unmount_inodes(struct super_block *sb)
539 : : {}
540 : :
541 : : #endif /* CONFIG_FSNOTIFY */
542 : :
543 : : #endif /* __KERNEL __ */
544 : :
545 : : #endif /* __LINUX_FSNOTIFY_BACKEND_H */
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