Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
90586523 EP |
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 | ||
63c882a0 | 13 | #include <linux/idr.h> /* inotify uses this */ |
90586523 EP |
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> | |
60063497 | 19 | #include <linux/atomic.h> |
1cce1eea | 20 | #include <linux/user_namespace.h> |
7761daa6 | 21 | #include <linux/refcount.h> |
90586523 EP |
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 | ||
42 | #define FS_UNMOUNT 0x00002000 /* inode on umount fs */ | |
43 | #define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */ | |
44 | #define FS_IN_IGNORED 0x00008000 /* last inotify event here */ | |
45 | ||
c4ec54b4 EP |
46 | #define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */ |
47 | #define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */ | |
48 | ||
8c1934c8 | 49 | #define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */ |
b29866aa | 50 | #define FS_ISDIR 0x40000000 /* event occurred against dir */ |
90586523 EP |
51 | #define FS_IN_ONESHOT 0x80000000 /* only send event once */ |
52 | ||
53 | #define FS_DN_RENAME 0x10000000 /* file renamed */ | |
54 | #define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */ | |
55 | ||
c28f7e56 EP |
56 | /* This inode cares about things that happen to its children. Always set for |
57 | * dnotify and inotify. */ | |
58 | #define FS_EVENT_ON_CHILD 0x08000000 | |
59 | ||
60 | /* This is a list of all events that may get sent to a parernt based on fs event | |
61 | * happening to inodes inside that directory */ | |
62 | #define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\ | |
63 | FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\ | |
64 | FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\ | |
a4f9a9a6 | 65 | FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM) |
c28f7e56 | 66 | |
e9fd702a EP |
67 | #define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO) |
68 | ||
ff8bcbd0 EP |
69 | #define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM) |
70 | ||
20dee624 EP |
71 | #define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \ |
72 | FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \ | |
73 | FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \ | |
74 | FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \ | |
75 | FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \ | |
76 | FS_OPEN_PERM | FS_ACCESS_PERM | FS_EXCL_UNLINK | \ | |
b29866aa | 77 | FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME | \ |
20dee624 EP |
78 | FS_DN_MULTISHOT | FS_EVENT_ON_CHILD) |
79 | ||
90586523 EP |
80 | struct fsnotify_group; |
81 | struct fsnotify_event; | |
e61ce867 | 82 | struct fsnotify_mark; |
e4aff117 | 83 | struct fsnotify_event_private_data; |
7053aee2 | 84 | struct fsnotify_fname; |
abc77577 | 85 | struct fsnotify_iter_info; |
90586523 EP |
86 | |
87 | /* | |
88 | * Each group much define these ops. The fsnotify infrastructure will call | |
89 | * these operations for each relevant group. | |
90 | * | |
91 | * handle_event - main call for a group to handle an fs event | |
92 | * free_group_priv - called when a group refcnt hits 0 to clean up the private union | |
6960b0d9 LS |
93 | * freeing_mark - called when a mark is being destroyed for some reason. The group |
94 | * MUST be holding a reference on each mark and that reference must be | |
95 | * dropped in this function. inotify uses this function to send | |
96 | * userspace messages that marks have been removed. | |
90586523 EP |
97 | */ |
98 | struct fsnotify_ops { | |
ce8f76fb | 99 | int (*handle_event)(struct fsnotify_group *group, |
7053aee2 | 100 | struct inode *inode, |
3cd5eca8 | 101 | u32 mask, const void *data, int data_type, |
9385a84d JK |
102 | const unsigned char *file_name, u32 cookie, |
103 | struct fsnotify_iter_info *iter_info); | |
90586523 | 104 | void (*free_group_priv)(struct fsnotify_group *group); |
841bdc10 | 105 | void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group); |
7053aee2 | 106 | void (*free_event)(struct fsnotify_event *event); |
054c636e JK |
107 | /* called on final put+free to free memory */ |
108 | void (*free_mark)(struct fsnotify_mark *mark); | |
7053aee2 JK |
109 | }; |
110 | ||
111 | /* | |
112 | * all of the information about the original object we want to now send to | |
113 | * a group. If you want to carry more info from the accessing task to the | |
114 | * listener this structure is where you need to be adding fields. | |
115 | */ | |
116 | struct fsnotify_event { | |
117 | struct list_head list; | |
118 | /* inode may ONLY be dereferenced during handle_event(). */ | |
119 | struct inode *inode; /* either the inode the event happened to or its parent */ | |
120 | u32 mask; /* the type of access, bitwise OR for FS_* event types */ | |
90586523 EP |
121 | }; |
122 | ||
123 | /* | |
124 | * A group is a "thing" that wants to receive notification about filesystem | |
125 | * events. The mask holds the subset of event types this group cares about. | |
126 | * refcnt on a group is up to the implementor and at any moment if it goes 0 | |
127 | * everything will be cleaned up. | |
128 | */ | |
129 | struct fsnotify_group { | |
90586523 EP |
130 | /* |
131 | * How the refcnt is used is up to each group. When the refcnt hits 0 | |
132 | * fsnotify will clean up all of the resources associated with this group. | |
133 | * As an example, the dnotify group will always have a refcnt=1 and that | |
134 | * will never change. Inotify, on the other hand, has a group per | |
135 | * inotify_init() and the refcnt will hit 0 only when that fd has been | |
136 | * closed. | |
137 | */ | |
7761daa6 | 138 | refcount_t refcnt; /* things with interest in this group */ |
90586523 EP |
139 | |
140 | const struct fsnotify_ops *ops; /* how this group handles things */ | |
141 | ||
a2d8bc6c | 142 | /* needed to send notification to userspace */ |
c21dbe20 | 143 | spinlock_t notification_lock; /* protect the notification_list */ |
a2d8bc6c EP |
144 | struct list_head notification_list; /* list of event_holder this group needs to send to userspace */ |
145 | wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */ | |
146 | unsigned int q_len; /* events on the queue */ | |
147 | unsigned int max_events; /* maximum events allowed on the list */ | |
6ad2d4e3 EP |
148 | /* |
149 | * Valid fsnotify group priorities. Events are send in order from highest | |
150 | * priority to lowest priority. We default to the lowest priority. | |
151 | */ | |
152 | #define FS_PRIO_0 0 /* normal notifiers, no permissions */ | |
153 | #define FS_PRIO_1 1 /* fanotify content based access control */ | |
154 | #define FS_PRIO_2 2 /* fanotify pre-content access */ | |
155 | unsigned int priority; | |
12703dbf | 156 | bool shutdown; /* group is being shut down, don't queue more events */ |
a2d8bc6c | 157 | |
e61ce867 | 158 | /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */ |
986ab098 | 159 | struct mutex mark_mutex; /* protect marks_list */ |
841bdc10 | 160 | atomic_t num_marks; /* 1 for each mark and 1 for not being |
3be25f49 EP |
161 | * past the point of no return when freeing |
162 | * a group */ | |
e61ce867 | 163 | struct list_head marks_list; /* all inode marks for this group */ |
3be25f49 | 164 | |
7053aee2 JK |
165 | struct fasync_struct *fsn_fa; /* async notification */ |
166 | ||
ff57cd58 | 167 | struct fsnotify_event *overflow_event; /* Event we queue when the |
7053aee2 JK |
168 | * notification list is too |
169 | * full */ | |
abc77577 JK |
170 | atomic_t user_waits; /* Number of tasks waiting for user |
171 | * response */ | |
0a6b6bd5 | 172 | |
90586523 EP |
173 | /* groups can define private fields here or use the void *private */ |
174 | union { | |
175 | void *private; | |
63c882a0 EP |
176 | #ifdef CONFIG_INOTIFY_USER |
177 | struct inotify_group_private_data { | |
178 | spinlock_t idr_lock; | |
179 | struct idr idr; | |
1cce1eea | 180 | struct ucounts *ucounts; |
63c882a0 | 181 | } inotify_data; |
9e66e423 | 182 | #endif |
80af2588 | 183 | #ifdef CONFIG_FANOTIFY |
9e66e423 EP |
184 | struct fanotify_group_private_data { |
185 | /* allows a group to block waiting for a userspace response */ | |
9e66e423 EP |
186 | struct list_head access_list; |
187 | wait_queue_head_t access_waitq; | |
80af2588 | 188 | int f_flags; |
e7099d8a | 189 | unsigned int max_marks; |
4afeff85 | 190 | struct user_struct *user; |
de8cd83e | 191 | bool audit; |
9e66e423 | 192 | } fanotify_data; |
80af2588 | 193 | #endif /* CONFIG_FANOTIFY */ |
90586523 EP |
194 | }; |
195 | }; | |
196 | ||
90586523 EP |
197 | /* when calling fsnotify tell it if the data is a path or inode */ |
198 | #define FSNOTIFY_EVENT_NONE 0 | |
2069601b | 199 | #define FSNOTIFY_EVENT_PATH 1 |
90586523 | 200 | #define FSNOTIFY_EVENT_INODE 2 |
90586523 | 201 | |
d6f7b98b AG |
202 | enum fsnotify_obj_type { |
203 | FSNOTIFY_OBJ_TYPE_INODE, | |
204 | FSNOTIFY_OBJ_TYPE_VFSMOUNT, | |
205 | FSNOTIFY_OBJ_TYPE_COUNT, | |
206 | FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT | |
207 | }; | |
208 | ||
209 | #define FSNOTIFY_OBJ_TYPE_INODE_FL (1U << FSNOTIFY_OBJ_TYPE_INODE) | |
210 | #define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL (1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT) | |
211 | #define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1) | |
212 | ||
5b0457ad | 213 | struct fsnotify_iter_info { |
47d9c7cc | 214 | struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT]; |
5b0457ad AG |
215 | unsigned int report_mask; |
216 | int srcu_idx; | |
217 | }; | |
218 | ||
47d9c7cc AG |
219 | static inline bool fsnotify_iter_should_report_type( |
220 | struct fsnotify_iter_info *iter_info, int type) | |
221 | { | |
222 | return (iter_info->report_mask & (1U << type)); | |
223 | } | |
224 | ||
225 | static inline void fsnotify_iter_set_report_type( | |
226 | struct fsnotify_iter_info *iter_info, int type) | |
227 | { | |
228 | iter_info->report_mask |= (1U << type); | |
229 | } | |
230 | ||
231 | static inline void fsnotify_iter_set_report_type_mark( | |
232 | struct fsnotify_iter_info *iter_info, int type, | |
233 | struct fsnotify_mark *mark) | |
234 | { | |
235 | iter_info->marks[type] = mark; | |
236 | iter_info->report_mask |= (1U << type); | |
237 | } | |
238 | ||
5b0457ad AG |
239 | #define FSNOTIFY_ITER_FUNCS(name, NAME) \ |
240 | static inline struct fsnotify_mark *fsnotify_iter_##name##_mark( \ | |
241 | struct fsnotify_iter_info *iter_info) \ | |
242 | { \ | |
243 | return (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_##NAME##_FL) ? \ | |
47d9c7cc | 244 | iter_info->marks[FSNOTIFY_OBJ_TYPE_##NAME] : NULL; \ |
5b0457ad AG |
245 | } |
246 | ||
247 | FSNOTIFY_ITER_FUNCS(inode, INODE) | |
248 | FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT) | |
249 | ||
47d9c7cc AG |
250 | #define fsnotify_foreach_obj_type(type) \ |
251 | for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++) | |
252 | ||
9dd813c1 JK |
253 | /* |
254 | * Inode / vfsmount point to this structure which tracks all marks attached to | |
e911d8af | 255 | * the inode / vfsmount. The reference to inode / vfsmount is held by this |
08991e83 JK |
256 | * structure. We destroy this structure when there are no more marks attached |
257 | * to it. The structure is protected by fsnotify_mark_srcu. | |
9dd813c1 JK |
258 | */ |
259 | struct fsnotify_mark_connector { | |
04662cab | 260 | spinlock_t lock; |
d6f7b98b | 261 | unsigned int type; /* Type of object [lock] */ |
86ffe245 JK |
262 | union { /* Object pointer [lock] */ |
263 | struct inode *inode; | |
264 | struct vfsmount *mnt; | |
08991e83 JK |
265 | /* Used listing heads to free after srcu period expires */ |
266 | struct fsnotify_mark_connector *destroy_next; | |
267 | }; | |
d90a10e2 | 268 | struct hlist_head list; |
9dd813c1 JK |
269 | }; |
270 | ||
9b6e5434 AG |
271 | typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t; |
272 | ||
3be25f49 | 273 | /* |
1e39fc01 | 274 | * A mark is simply an object attached to an in core inode which allows an |
3be25f49 EP |
275 | * fsnotify listener to indicate they are either no longer interested in events |
276 | * of a type matching mask or only interested in those events. | |
277 | * | |
1e39fc01 JK |
278 | * These are flushed when an inode is evicted from core and may be flushed |
279 | * when the inode is modified (as seen by fsnotify_access). Some fsnotify | |
280 | * users (such as dnotify) will flush these when the open fd is closed and not | |
281 | * at inode eviction or modification. | |
282 | * | |
283 | * Text in brackets is showing the lock(s) protecting modifications of a | |
284 | * particular entry. obj_lock means either inode->i_lock or | |
285 | * mnt->mnt_root->d_lock depending on the mark type. | |
3be25f49 | 286 | */ |
e61ce867 | 287 | struct fsnotify_mark { |
1e39fc01 JK |
288 | /* Mask this mark is for [mark->lock, group->mark_mutex] */ |
289 | __u32 mask; | |
290 | /* We hold one for presence in g_list. Also one ref for each 'thing' | |
3be25f49 | 291 | * in kernel that found and may be using this mark. */ |
ab97f873 | 292 | refcount_t refcnt; |
1e39fc01 JK |
293 | /* Group this mark is for. Set on mark creation, stable until last ref |
294 | * is dropped */ | |
295 | struct fsnotify_group *group; | |
8e984f86 | 296 | /* List of marks by group->marks_list. Also reused for queueing |
1e39fc01 JK |
297 | * mark into destroy_list when it's waiting for the end of SRCU period |
298 | * before it can be freed. [group->mark_mutex] */ | |
13d34ac6 | 299 | struct list_head g_list; |
1e39fc01 JK |
300 | /* Protects inode / mnt pointers, flags, masks */ |
301 | spinlock_t lock; | |
6b3f05d2 | 302 | /* List of marks for inode / vfsmount [connector->lock, mark ref] */ |
1e39fc01 | 303 | struct hlist_node obj_list; |
6b3f05d2 | 304 | /* Head of list of marks for an object [mark ref] */ |
86ffe245 | 305 | struct fsnotify_mark_connector *connector; |
1e39fc01 JK |
306 | /* Events types to ignore [mark->lock, group->mark_mutex] */ |
307 | __u32 ignored_mask; | |
e911d8af JK |
308 | #define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01 |
309 | #define FSNOTIFY_MARK_FLAG_ALIVE 0x02 | |
310 | #define FSNOTIFY_MARK_FLAG_ATTACHED 0x04 | |
1e39fc01 | 311 | unsigned int flags; /* flags [mark->lock] */ |
3be25f49 EP |
312 | }; |
313 | ||
90586523 EP |
314 | #ifdef CONFIG_FSNOTIFY |
315 | ||
316 | /* called from the vfs helpers */ | |
317 | ||
318 | /* main fsnotify call to send events */ | |
e637835e | 319 | extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is, |
c4ec54b4 | 320 | const unsigned char *name, u32 cookie); |
12c7f9dc | 321 | extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask); |
3be25f49 | 322 | extern void __fsnotify_inode_delete(struct inode *inode); |
ca9c726e | 323 | extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt); |
47882c6f | 324 | extern u32 fsnotify_get_cookie(void); |
90586523 | 325 | |
c28f7e56 EP |
326 | static inline int fsnotify_inode_watches_children(struct inode *inode) |
327 | { | |
328 | /* FS_EVENT_ON_CHILD is set if the inode may care */ | |
329 | if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD)) | |
330 | return 0; | |
331 | /* this inode might care about child events, does it care about the | |
332 | * specific set of events that can happen on a child? */ | |
333 | return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD; | |
334 | } | |
335 | ||
336 | /* | |
337 | * Update the dentry with a flag indicating the interest of its parent to receive | |
338 | * filesystem events when those events happens to this dentry->d_inode. | |
339 | */ | |
affda484 | 340 | static inline void fsnotify_update_flags(struct dentry *dentry) |
c28f7e56 | 341 | { |
c28f7e56 EP |
342 | assert_spin_locked(&dentry->d_lock); |
343 | ||
b5c84bf6 NP |
344 | /* |
345 | * Serialisation of setting PARENT_WATCHED on the dentries is provided | |
346 | * by d_lock. If inotify_inode_watched changes after we have taken | |
347 | * d_lock, the following __fsnotify_update_child_dentry_flags call will | |
348 | * find our entry, so it will spin until we complete here, and update | |
349 | * us with the new state. | |
350 | */ | |
affda484 | 351 | if (fsnotify_inode_watches_children(dentry->d_parent->d_inode)) |
c28f7e56 EP |
352 | dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; |
353 | else | |
354 | dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; | |
355 | } | |
356 | ||
90586523 EP |
357 | /* called from fsnotify listeners, such as fanotify or dnotify */ |
358 | ||
98612952 | 359 | /* create a new group */ |
0d2e2a1d | 360 | extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops); |
98612952 LS |
361 | /* get reference to a group */ |
362 | extern void fsnotify_get_group(struct fsnotify_group *group); | |
ffab8340 | 363 | /* drop reference on a group from fsnotify_alloc_group */ |
90586523 | 364 | extern void fsnotify_put_group(struct fsnotify_group *group); |
12703dbf JK |
365 | /* group destruction begins, stop queuing new events */ |
366 | extern void fsnotify_group_stop_queueing(struct fsnotify_group *group); | |
d8153d4d LS |
367 | /* destroy group */ |
368 | extern void fsnotify_destroy_group(struct fsnotify_group *group); | |
0a6b6bd5 EP |
369 | /* fasync handler function */ |
370 | extern int fsnotify_fasync(int fd, struct file *file, int on); | |
7053aee2 JK |
371 | /* Free event from memory */ |
372 | extern void fsnotify_destroy_event(struct fsnotify_group *group, | |
373 | struct fsnotify_event *event); | |
a2d8bc6c | 374 | /* attach the event to the group notification queue */ |
8ba8fa91 JK |
375 | extern int fsnotify_add_event(struct fsnotify_group *group, |
376 | struct fsnotify_event *event, | |
377 | int (*merge)(struct list_head *, | |
378 | struct fsnotify_event *)); | |
7b1f6417 JK |
379 | /* Queue overflow event to a notification group */ |
380 | static inline void fsnotify_queue_overflow(struct fsnotify_group *group) | |
381 | { | |
382 | fsnotify_add_event(group, group->overflow_event, NULL); | |
383 | } | |
384 | ||
a2d8bc6c EP |
385 | /* true if the group notification queue is empty */ |
386 | extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group); | |
387 | /* return, but do not dequeue the first event on the notification queue */ | |
8ba8fa91 | 388 | extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group); |
e4aff117 | 389 | /* return AND dequeue the first event on the notification queue */ |
8ba8fa91 | 390 | extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group); |
a2d8bc6c | 391 | |
3be25f49 EP |
392 | /* functions used to manipulate the marks attached to inodes */ |
393 | ||
a242677b JK |
394 | /* Calculate mask of events for a list of marks */ |
395 | extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn); | |
7b129323 | 396 | extern void fsnotify_init_mark(struct fsnotify_mark *mark, |
054c636e | 397 | struct fsnotify_group *group); |
b1362edf | 398 | /* Find mark belonging to given group in the list of marks */ |
9b6e5434 AG |
399 | extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp, |
400 | struct fsnotify_group *group); | |
7b129323 JK |
401 | /* attach the mark to the inode or vfsmount */ |
402 | extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct inode *inode, | |
403 | struct vfsmount *mnt, int allow_dups); | |
404 | extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark, | |
b249f5be AG |
405 | struct inode *inode, struct vfsmount *mnt, |
406 | int allow_dups); | |
407 | /* attach the mark to the inode */ | |
408 | static inline int fsnotify_add_inode_mark(struct fsnotify_mark *mark, | |
409 | struct inode *inode, | |
410 | int allow_dups) | |
411 | { | |
412 | return fsnotify_add_mark(mark, inode, NULL, allow_dups); | |
413 | } | |
414 | static inline int fsnotify_add_inode_mark_locked(struct fsnotify_mark *mark, | |
415 | struct inode *inode, | |
416 | int allow_dups) | |
417 | { | |
418 | return fsnotify_add_mark_locked(mark, inode, NULL, allow_dups); | |
419 | } | |
e2a29943 LS |
420 | /* given a group and a mark, flag mark to be freed when all references are dropped */ |
421 | extern void fsnotify_destroy_mark(struct fsnotify_mark *mark, | |
422 | struct fsnotify_group *group); | |
4712e722 JK |
423 | /* detach mark from inode / mount list, group list, drop inode reference */ |
424 | extern void fsnotify_detach_mark(struct fsnotify_mark *mark); | |
425 | /* free mark */ | |
426 | extern void fsnotify_free_mark(struct fsnotify_mark *mark); | |
86ffe245 | 427 | /* run all the marks in a group, and clear all of the marks attached to given object type */ |
18f2e0d3 | 428 | extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type); |
416bcdbc JK |
429 | /* run all the marks in a group, and clear all of the vfsmount marks */ |
430 | static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group) | |
431 | { | |
d6f7b98b | 432 | fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL); |
416bcdbc JK |
433 | } |
434 | /* run all the marks in a group, and clear all of the inode marks */ | |
435 | static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group) | |
436 | { | |
d6f7b98b | 437 | fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL); |
416bcdbc | 438 | } |
841bdc10 EP |
439 | extern void fsnotify_get_mark(struct fsnotify_mark *mark); |
440 | extern void fsnotify_put_mark(struct fsnotify_mark *mark); | |
74278da9 | 441 | extern void fsnotify_unmount_inodes(struct super_block *sb); |
abc77577 JK |
442 | extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info); |
443 | extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info); | |
3be25f49 | 444 | |
90586523 | 445 | /* put here because inotify does some weird stuff when destroying watches */ |
7053aee2 JK |
446 | extern void fsnotify_init_event(struct fsnotify_event *event, |
447 | struct inode *to_tell, u32 mask); | |
b4e4e140 | 448 | |
90586523 EP |
449 | #else |
450 | ||
e637835e | 451 | static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is, |
c4ec54b4 EP |
452 | const unsigned char *name, u32 cookie) |
453 | { | |
454 | return 0; | |
455 | } | |
3be25f49 | 456 | |
12c7f9dc | 457 | static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask) |
52420392 EP |
458 | { |
459 | return 0; | |
460 | } | |
c28f7e56 | 461 | |
3be25f49 EP |
462 | static inline void __fsnotify_inode_delete(struct inode *inode) |
463 | {} | |
464 | ||
ca9c726e AG |
465 | static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt) |
466 | {} | |
467 | ||
affda484 | 468 | static inline void fsnotify_update_flags(struct dentry *dentry) |
c28f7e56 EP |
469 | {} |
470 | ||
47882c6f EP |
471 | static inline u32 fsnotify_get_cookie(void) |
472 | { | |
473 | return 0; | |
474 | } | |
475 | ||
74278da9 | 476 | static inline void fsnotify_unmount_inodes(struct super_block *sb) |
164bc619 EP |
477 | {} |
478 | ||
90586523 EP |
479 | #endif /* CONFIG_FSNOTIFY */ |
480 | ||
481 | #endif /* __KERNEL __ */ | |
482 | ||
483 | #endif /* __LINUX_FSNOTIFY_BACKEND_H */ |