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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 : : /* inode may ONLY be dereferenced during handle_event(). */
137 : : struct inode *inode; /* either the inode the event happened to or its parent */
138 : : };
139 : :
140 : : /*
141 : : * A group is a "thing" that wants to receive notification about filesystem
142 : : * events. The mask holds the subset of event types this group cares about.
143 : : * refcnt on a group is up to the implementor and at any moment if it goes 0
144 : : * everything will be cleaned up.
145 : : */
146 : : struct fsnotify_group {
147 : : const struct fsnotify_ops *ops; /* how this group handles things */
148 : :
149 : : /*
150 : : * How the refcnt is used is up to each group. When the refcnt hits 0
151 : : * fsnotify will clean up all of the resources associated with this group.
152 : : * As an example, the dnotify group will always have a refcnt=1 and that
153 : : * will never change. Inotify, on the other hand, has a group per
154 : : * inotify_init() and the refcnt will hit 0 only when that fd has been
155 : : * closed.
156 : : */
157 : : refcount_t refcnt; /* things with interest in this group */
158 : :
159 : : /* needed to send notification to userspace */
160 : : spinlock_t notification_lock; /* protect the notification_list */
161 : : struct list_head notification_list; /* list of event_holder this group needs to send to userspace */
162 : : wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */
163 : : unsigned int q_len; /* events on the queue */
164 : : unsigned int max_events; /* maximum events allowed on the list */
165 : : /*
166 : : * Valid fsnotify group priorities. Events are send in order from highest
167 : : * priority to lowest priority. We default to the lowest priority.
168 : : */
169 : : #define FS_PRIO_0 0 /* normal notifiers, no permissions */
170 : : #define FS_PRIO_1 1 /* fanotify content based access control */
171 : : #define FS_PRIO_2 2 /* fanotify pre-content access */
172 : : unsigned int priority;
173 : : bool shutdown; /* group is being shut down, don't queue more events */
174 : :
175 : : /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */
176 : : struct mutex mark_mutex; /* protect marks_list */
177 : : atomic_t num_marks; /* 1 for each mark and 1 for not being
178 : : * past the point of no return when freeing
179 : : * a group */
180 : : atomic_t user_waits; /* Number of tasks waiting for user
181 : : * response */
182 : : struct list_head marks_list; /* all inode marks for this group */
183 : :
184 : : struct fasync_struct *fsn_fa; /* async notification */
185 : :
186 : : struct fsnotify_event *overflow_event; /* Event we queue when the
187 : : * notification list is too
188 : : * full */
189 : :
190 : : struct mem_cgroup *memcg; /* memcg to charge allocations */
191 : :
192 : : /* groups can define private fields here or use the void *private */
193 : : union {
194 : : void *private;
195 : : #ifdef CONFIG_INOTIFY_USER
196 : : struct inotify_group_private_data {
197 : : spinlock_t idr_lock;
198 : : struct idr idr;
199 : : struct ucounts *ucounts;
200 : : } inotify_data;
201 : : #endif
202 : : #ifdef CONFIG_FANOTIFY
203 : : struct fanotify_group_private_data {
204 : : /* allows a group to block waiting for a userspace response */
205 : : struct list_head access_list;
206 : : wait_queue_head_t access_waitq;
207 : : int flags; /* flags from fanotify_init() */
208 : : int f_flags; /* event_f_flags from fanotify_init() */
209 : : unsigned int max_marks;
210 : : struct user_struct *user;
211 : : } fanotify_data;
212 : : #endif /* CONFIG_FANOTIFY */
213 : : };
214 : : };
215 : :
216 : : /* when calling fsnotify tell it if the data is a path or inode */
217 : : #define FSNOTIFY_EVENT_NONE 0
218 : : #define FSNOTIFY_EVENT_PATH 1
219 : : #define FSNOTIFY_EVENT_INODE 2
220 : :
221 : : enum fsnotify_obj_type {
222 : : FSNOTIFY_OBJ_TYPE_INODE,
223 : : FSNOTIFY_OBJ_TYPE_VFSMOUNT,
224 : : FSNOTIFY_OBJ_TYPE_SB,
225 : : FSNOTIFY_OBJ_TYPE_COUNT,
226 : : FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT
227 : : };
228 : :
229 : : #define FSNOTIFY_OBJ_TYPE_INODE_FL (1U << FSNOTIFY_OBJ_TYPE_INODE)
230 : : #define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL (1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
231 : : #define FSNOTIFY_OBJ_TYPE_SB_FL (1U << FSNOTIFY_OBJ_TYPE_SB)
232 : : #define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
233 : :
234 : 1320 : static inline bool fsnotify_valid_obj_type(unsigned int type)
235 : : {
236 [ - + + - : 1320 : return (type < FSNOTIFY_OBJ_TYPE_COUNT);
- - ]
237 : : }
238 : :
239 : : struct fsnotify_iter_info {
240 : : struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT];
241 : : unsigned int report_mask;
242 : : int srcu_idx;
243 : : };
244 : :
245 : 6831 : static inline bool fsnotify_iter_should_report_type(
246 : : struct fsnotify_iter_info *iter_info, int type)
247 : : {
248 [ + + + + : 6831 : return (iter_info->report_mask & (1U << type));
+ + ]
249 : : }
250 : :
251 : 865 : static inline void fsnotify_iter_set_report_type(
252 : : struct fsnotify_iter_info *iter_info, int type)
253 : : {
254 : 865 : iter_info->report_mask |= (1U << type);
255 : 865 : }
256 : :
257 : 187 : static inline void fsnotify_iter_set_report_type_mark(
258 : : struct fsnotify_iter_info *iter_info, int type,
259 : : struct fsnotify_mark *mark)
260 : : {
261 : 187 : iter_info->marks[type] = mark;
262 : 187 : iter_info->report_mask |= (1U << type);
263 : : }
264 : :
265 : : #define FSNOTIFY_ITER_FUNCS(name, NAME) \
266 : : static inline struct fsnotify_mark *fsnotify_iter_##name##_mark( \
267 : : struct fsnotify_iter_info *iter_info) \
268 : : { \
269 : : return (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_##NAME##_FL) ? \
270 : : iter_info->marks[FSNOTIFY_OBJ_TYPE_##NAME] : NULL; \
271 : : }
272 : :
273 [ + - ]: 851 : FSNOTIFY_ITER_FUNCS(inode, INODE)
274 [ - + ]: 851 : FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
275 : : FSNOTIFY_ITER_FUNCS(sb, SB)
276 : :
277 : : #define fsnotify_foreach_obj_type(type) \
278 : : for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
279 : :
280 : : /*
281 : : * fsnotify_connp_t is what we embed in objects which connector can be attached
282 : : * to. fsnotify_connp_t * is how we refer from connector back to object.
283 : : */
284 : : struct fsnotify_mark_connector;
285 : : typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
286 : :
287 : : /*
288 : : * Inode/vfsmount/sb point to this structure which tracks all marks attached to
289 : : * the inode/vfsmount/sb. The reference to inode/vfsmount/sb is held by this
290 : : * structure. We destroy this structure when there are no more marks attached
291 : : * to it. The structure is protected by fsnotify_mark_srcu.
292 : : */
293 : : struct fsnotify_mark_connector {
294 : : spinlock_t lock;
295 : : unsigned short type; /* Type of object [lock] */
296 : : #define FSNOTIFY_CONN_FLAG_HAS_FSID 0x01
297 : : unsigned short flags; /* flags [lock] */
298 : : __kernel_fsid_t fsid; /* fsid of filesystem containing object */
299 : : union {
300 : : /* Object pointer [lock] */
301 : : fsnotify_connp_t *obj;
302 : : /* Used listing heads to free after srcu period expires */
303 : : struct fsnotify_mark_connector *destroy_next;
304 : : };
305 : : struct hlist_head list;
306 : : };
307 : :
308 : : /*
309 : : * A mark is simply an object attached to an in core inode which allows an
310 : : * fsnotify listener to indicate they are either no longer interested in events
311 : : * of a type matching mask or only interested in those events.
312 : : *
313 : : * These are flushed when an inode is evicted from core and may be flushed
314 : : * when the inode is modified (as seen by fsnotify_access). Some fsnotify
315 : : * users (such as dnotify) will flush these when the open fd is closed and not
316 : : * at inode eviction or modification.
317 : : *
318 : : * Text in brackets is showing the lock(s) protecting modifications of a
319 : : * particular entry. obj_lock means either inode->i_lock or
320 : : * mnt->mnt_root->d_lock depending on the mark type.
321 : : */
322 : : struct fsnotify_mark {
323 : : /* Mask this mark is for [mark->lock, group->mark_mutex] */
324 : : __u32 mask;
325 : : /* We hold one for presence in g_list. Also one ref for each 'thing'
326 : : * in kernel that found and may be using this mark. */
327 : : refcount_t refcnt;
328 : : /* Group this mark is for. Set on mark creation, stable until last ref
329 : : * is dropped */
330 : : struct fsnotify_group *group;
331 : : /* List of marks by group->marks_list. Also reused for queueing
332 : : * mark into destroy_list when it's waiting for the end of SRCU period
333 : : * before it can be freed. [group->mark_mutex] */
334 : : struct list_head g_list;
335 : : /* Protects inode / mnt pointers, flags, masks */
336 : : spinlock_t lock;
337 : : /* List of marks for inode / vfsmount [connector->lock, mark ref] */
338 : : struct hlist_node obj_list;
339 : : /* Head of list of marks for an object [mark ref] */
340 : : struct fsnotify_mark_connector *connector;
341 : : /* Events types to ignore [mark->lock, group->mark_mutex] */
342 : : __u32 ignored_mask;
343 : : #define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01
344 : : #define FSNOTIFY_MARK_FLAG_ALIVE 0x02
345 : : #define FSNOTIFY_MARK_FLAG_ATTACHED 0x04
346 : : unsigned int flags; /* flags [mark->lock] */
347 : : };
348 : :
349 : : #ifdef CONFIG_FSNOTIFY
350 : :
351 : : /* called from the vfs helpers */
352 : :
353 : : /* main fsnotify call to send events */
354 : : extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
355 : : const struct qstr *name, u32 cookie);
356 : : extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask);
357 : : extern void __fsnotify_inode_delete(struct inode *inode);
358 : : extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
359 : : extern void fsnotify_sb_delete(struct super_block *sb);
360 : : extern u32 fsnotify_get_cookie(void);
361 : :
362 : 241346 : static inline int fsnotify_inode_watches_children(struct inode *inode)
363 : : {
364 : : /* FS_EVENT_ON_CHILD is set if the inode may care */
365 [ + - + - ]: 241346 : if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD))
366 : : return 0;
367 : : /* this inode might care about child events, does it care about the
368 : : * specific set of events that can happen on a child? */
369 : 16762 : return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD;
370 : : }
371 : :
372 : : /*
373 : : * Update the dentry with a flag indicating the interest of its parent to receive
374 : : * filesystem events when those events happens to this dentry->d_inode.
375 : : */
376 : 224878 : static inline void fsnotify_update_flags(struct dentry *dentry)
377 : : {
378 [ - + ]: 224878 : assert_spin_locked(&dentry->d_lock);
379 : :
380 : : /*
381 : : * Serialisation of setting PARENT_WATCHED on the dentries is provided
382 : : * by d_lock. If inotify_inode_watched changes after we have taken
383 : : * d_lock, the following __fsnotify_update_child_dentry_flags call will
384 : : * find our entry, so it will spin until we complete here, and update
385 : : * us with the new state.
386 : : */
387 [ + + + + ]: 224878 : if (fsnotify_inode_watches_children(dentry->d_parent->d_inode))
388 : 44 : dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
389 : : else
390 : 224834 : dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
391 : 224878 : }
392 : :
393 : : /* called from fsnotify listeners, such as fanotify or dnotify */
394 : :
395 : : /* create a new group */
396 : : extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
397 : : /* get reference to a group */
398 : : extern void fsnotify_get_group(struct fsnotify_group *group);
399 : : /* drop reference on a group from fsnotify_alloc_group */
400 : : extern void fsnotify_put_group(struct fsnotify_group *group);
401 : : /* group destruction begins, stop queuing new events */
402 : : extern void fsnotify_group_stop_queueing(struct fsnotify_group *group);
403 : : /* destroy group */
404 : : extern void fsnotify_destroy_group(struct fsnotify_group *group);
405 : : /* fasync handler function */
406 : : extern int fsnotify_fasync(int fd, struct file *file, int on);
407 : : /* Free event from memory */
408 : : extern void fsnotify_destroy_event(struct fsnotify_group *group,
409 : : struct fsnotify_event *event);
410 : : /* attach the event to the group notification queue */
411 : : extern int fsnotify_add_event(struct fsnotify_group *group,
412 : : struct fsnotify_event *event,
413 : : int (*merge)(struct list_head *,
414 : : struct fsnotify_event *));
415 : : /* Queue overflow event to a notification group */
416 : 0 : static inline void fsnotify_queue_overflow(struct fsnotify_group *group)
417 : : {
418 : 0 : fsnotify_add_event(group, group->overflow_event, NULL);
419 : : }
420 : :
421 : : /* true if the group notification queue is empty */
422 : : extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
423 : : /* return, but do not dequeue the first event on the notification queue */
424 : : extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group);
425 : : /* return AND dequeue the first event on the notification queue */
426 : : extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group);
427 : : /* Remove event queued in the notification list */
428 : : extern void fsnotify_remove_queued_event(struct fsnotify_group *group,
429 : : struct fsnotify_event *event);
430 : :
431 : : /* functions used to manipulate the marks attached to inodes */
432 : :
433 : : /* Get mask of events for a list of marks */
434 : : extern __u32 fsnotify_conn_mask(struct fsnotify_mark_connector *conn);
435 : : /* Calculate mask of events for a list of marks */
436 : : extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
437 : : extern void fsnotify_init_mark(struct fsnotify_mark *mark,
438 : : struct fsnotify_group *group);
439 : : /* Find mark belonging to given group in the list of marks */
440 : : extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp,
441 : : struct fsnotify_group *group);
442 : : /* Get cached fsid of filesystem containing object */
443 : : extern int fsnotify_get_conn_fsid(const struct fsnotify_mark_connector *conn,
444 : : __kernel_fsid_t *fsid);
445 : : /* attach the mark to the object */
446 : : extern int fsnotify_add_mark(struct fsnotify_mark *mark,
447 : : fsnotify_connp_t *connp, unsigned int type,
448 : : int allow_dups, __kernel_fsid_t *fsid);
449 : : extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
450 : : fsnotify_connp_t *connp,
451 : : unsigned int type, int allow_dups,
452 : : __kernel_fsid_t *fsid);
453 : :
454 : : /* attach the mark to the inode */
455 : 0 : static inline int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
456 : : struct inode *inode,
457 : : int allow_dups)
458 : : {
459 : 0 : return fsnotify_add_mark(mark, &inode->i_fsnotify_marks,
460 : : FSNOTIFY_OBJ_TYPE_INODE, allow_dups, NULL);
461 : : }
462 : 616 : static inline int fsnotify_add_inode_mark_locked(struct fsnotify_mark *mark,
463 : : struct inode *inode,
464 : : int allow_dups)
465 : : {
466 : 616 : return fsnotify_add_mark_locked(mark, &inode->i_fsnotify_marks,
467 : : FSNOTIFY_OBJ_TYPE_INODE, allow_dups,
468 : : NULL);
469 : : }
470 : :
471 : : /* given a group and a mark, flag mark to be freed when all references are dropped */
472 : : extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
473 : : struct fsnotify_group *group);
474 : : /* detach mark from inode / mount list, group list, drop inode reference */
475 : : extern void fsnotify_detach_mark(struct fsnotify_mark *mark);
476 : : /* free mark */
477 : : extern void fsnotify_free_mark(struct fsnotify_mark *mark);
478 : : /* Wait until all marks queued for destruction are destroyed */
479 : : extern void fsnotify_wait_marks_destroyed(void);
480 : : /* run all the marks in a group, and clear all of the marks attached to given object type */
481 : : extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type);
482 : : /* run all the marks in a group, and clear all of the vfsmount marks */
483 : : static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
484 : : {
485 : : fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL);
486 : : }
487 : : /* run all the marks in a group, and clear all of the inode marks */
488 : : static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
489 : : {
490 : : fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL);
491 : : }
492 : : /* run all the marks in a group, and clear all of the sn marks */
493 : : static inline void fsnotify_clear_sb_marks_by_group(struct fsnotify_group *group)
494 : : {
495 : : fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_SB_FL);
496 : : }
497 : : extern void fsnotify_get_mark(struct fsnotify_mark *mark);
498 : : extern void fsnotify_put_mark(struct fsnotify_mark *mark);
499 : : extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
500 : : extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
501 : :
502 : 972 : static inline void fsnotify_init_event(struct fsnotify_event *event,
503 : : struct inode *inode)
504 : : {
505 [ + + ]: 972 : INIT_LIST_HEAD(&event->list);
506 [ + + ]: 972 : event->inode = inode;
507 : : }
508 : :
509 : : #else
510 : :
511 : : static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
512 : : const struct qstr *name, u32 cookie)
513 : : {
514 : : return 0;
515 : : }
516 : :
517 : : static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
518 : : {
519 : : return 0;
520 : : }
521 : :
522 : : static inline void __fsnotify_inode_delete(struct inode *inode)
523 : : {}
524 : :
525 : : static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
526 : : {}
527 : :
528 : : static inline void fsnotify_sb_delete(struct super_block *sb)
529 : : {}
530 : :
531 : : static inline void fsnotify_update_flags(struct dentry *dentry)
532 : : {}
533 : :
534 : : static inline u32 fsnotify_get_cookie(void)
535 : : {
536 : : return 0;
537 : : }
538 : :
539 : : static inline void fsnotify_unmount_inodes(struct super_block *sb)
540 : : {}
541 : :
542 : : #endif /* CONFIG_FSNOTIFY */
543 : :
544 : : #endif /* __KERNEL __ */
545 : :
546 : : #endif /* __LINUX_FSNOTIFY_BACKEND_H */
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