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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 | ||
4449175b | 71 | /* Events that can be reported to backends */ |
20dee624 EP |
72 | #define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \ |
73 | FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \ | |
74 | FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \ | |
75 | FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \ | |
76 | FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \ | |
4449175b AG |
77 | FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME) |
78 | ||
79 | /* Extra flags that may be reported with event or control handling of events */ | |
80 | #define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \ | |
20dee624 EP |
81 | FS_DN_MULTISHOT | FS_EVENT_ON_CHILD) |
82 | ||
4449175b AG |
83 | #define ALL_FSNOTIFY_BITS (ALL_FSNOTIFY_EVENTS | ALL_FSNOTIFY_FLAGS) |
84 | ||
90586523 EP |
85 | struct fsnotify_group; |
86 | struct fsnotify_event; | |
e61ce867 | 87 | struct fsnotify_mark; |
e4aff117 | 88 | struct fsnotify_event_private_data; |
7053aee2 | 89 | struct fsnotify_fname; |
abc77577 | 90 | struct fsnotify_iter_info; |
90586523 EP |
91 | |
92 | /* | |
93 | * Each group much define these ops. The fsnotify infrastructure will call | |
94 | * these operations for each relevant group. | |
95 | * | |
96 | * handle_event - main call for a group to handle an fs event | |
97 | * free_group_priv - called when a group refcnt hits 0 to clean up the private union | |
6960b0d9 LS |
98 | * freeing_mark - called when a mark is being destroyed for some reason. The group |
99 | * MUST be holding a reference on each mark and that reference must be | |
100 | * dropped in this function. inotify uses this function to send | |
101 | * userspace messages that marks have been removed. | |
90586523 EP |
102 | */ |
103 | struct fsnotify_ops { | |
ce8f76fb | 104 | int (*handle_event)(struct fsnotify_group *group, |
7053aee2 | 105 | struct inode *inode, |
ce8f76fb EP |
106 | struct fsnotify_mark *inode_mark, |
107 | struct fsnotify_mark *vfsmount_mark, | |
3cd5eca8 | 108 | u32 mask, const void *data, int data_type, |
9385a84d JK |
109 | const unsigned char *file_name, u32 cookie, |
110 | struct fsnotify_iter_info *iter_info); | |
90586523 | 111 | void (*free_group_priv)(struct fsnotify_group *group); |
841bdc10 | 112 | void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group); |
7053aee2 | 113 | void (*free_event)(struct fsnotify_event *event); |
054c636e JK |
114 | /* called on final put+free to free memory */ |
115 | void (*free_mark)(struct fsnotify_mark *mark); | |
7053aee2 JK |
116 | }; |
117 | ||
118 | /* | |
119 | * all of the information about the original object we want to now send to | |
120 | * a group. If you want to carry more info from the accessing task to the | |
121 | * listener this structure is where you need to be adding fields. | |
122 | */ | |
123 | struct fsnotify_event { | |
124 | struct list_head list; | |
125 | /* inode may ONLY be dereferenced during handle_event(). */ | |
126 | struct inode *inode; /* either the inode the event happened to or its parent */ | |
127 | u32 mask; /* the type of access, bitwise OR for FS_* event types */ | |
90586523 EP |
128 | }; |
129 | ||
130 | /* | |
131 | * A group is a "thing" that wants to receive notification about filesystem | |
132 | * events. The mask holds the subset of event types this group cares about. | |
133 | * refcnt on a group is up to the implementor and at any moment if it goes 0 | |
134 | * everything will be cleaned up. | |
135 | */ | |
136 | struct fsnotify_group { | |
90586523 EP |
137 | /* |
138 | * How the refcnt is used is up to each group. When the refcnt hits 0 | |
139 | * fsnotify will clean up all of the resources associated with this group. | |
140 | * As an example, the dnotify group will always have a refcnt=1 and that | |
141 | * will never change. Inotify, on the other hand, has a group per | |
142 | * inotify_init() and the refcnt will hit 0 only when that fd has been | |
143 | * closed. | |
144 | */ | |
7761daa6 | 145 | refcount_t refcnt; /* things with interest in this group */ |
90586523 EP |
146 | |
147 | const struct fsnotify_ops *ops; /* how this group handles things */ | |
148 | ||
a2d8bc6c | 149 | /* needed to send notification to userspace */ |
c21dbe20 | 150 | spinlock_t notification_lock; /* protect the notification_list */ |
a2d8bc6c EP |
151 | struct list_head notification_list; /* list of event_holder this group needs to send to userspace */ |
152 | wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */ | |
153 | unsigned int q_len; /* events on the queue */ | |
154 | unsigned int max_events; /* maximum events allowed on the list */ | |
6ad2d4e3 EP |
155 | /* |
156 | * Valid fsnotify group priorities. Events are send in order from highest | |
157 | * priority to lowest priority. We default to the lowest priority. | |
158 | */ | |
159 | #define FS_PRIO_0 0 /* normal notifiers, no permissions */ | |
160 | #define FS_PRIO_1 1 /* fanotify content based access control */ | |
161 | #define FS_PRIO_2 2 /* fanotify pre-content access */ | |
162 | unsigned int priority; | |
12703dbf | 163 | bool shutdown; /* group is being shut down, don't queue more events */ |
a2d8bc6c | 164 | |
e61ce867 | 165 | /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */ |
986ab098 | 166 | struct mutex mark_mutex; /* protect marks_list */ |
841bdc10 | 167 | atomic_t num_marks; /* 1 for each mark and 1 for not being |
3be25f49 EP |
168 | * past the point of no return when freeing |
169 | * a group */ | |
e61ce867 | 170 | struct list_head marks_list; /* all inode marks for this group */ |
3be25f49 | 171 | |
7053aee2 JK |
172 | struct fasync_struct *fsn_fa; /* async notification */ |
173 | ||
ff57cd58 | 174 | struct fsnotify_event *overflow_event; /* Event we queue when the |
7053aee2 JK |
175 | * notification list is too |
176 | * full */ | |
abc77577 JK |
177 | atomic_t user_waits; /* Number of tasks waiting for user |
178 | * response */ | |
0a6b6bd5 | 179 | |
90586523 EP |
180 | /* groups can define private fields here or use the void *private */ |
181 | union { | |
182 | void *private; | |
63c882a0 EP |
183 | #ifdef CONFIG_INOTIFY_USER |
184 | struct inotify_group_private_data { | |
185 | spinlock_t idr_lock; | |
186 | struct idr idr; | |
1cce1eea | 187 | struct ucounts *ucounts; |
63c882a0 | 188 | } inotify_data; |
9e66e423 | 189 | #endif |
80af2588 | 190 | #ifdef CONFIG_FANOTIFY |
9e66e423 EP |
191 | struct fanotify_group_private_data { |
192 | /* allows a group to block waiting for a userspace response */ | |
9e66e423 EP |
193 | struct list_head access_list; |
194 | wait_queue_head_t access_waitq; | |
80af2588 | 195 | int f_flags; |
e7099d8a | 196 | unsigned int max_marks; |
4afeff85 | 197 | struct user_struct *user; |
de8cd83e | 198 | bool audit; |
9e66e423 | 199 | } fanotify_data; |
80af2588 | 200 | #endif /* CONFIG_FANOTIFY */ |
90586523 EP |
201 | }; |
202 | }; | |
203 | ||
90586523 EP |
204 | /* when calling fsnotify tell it if the data is a path or inode */ |
205 | #define FSNOTIFY_EVENT_NONE 0 | |
2069601b | 206 | #define FSNOTIFY_EVENT_PATH 1 |
90586523 | 207 | #define FSNOTIFY_EVENT_INODE 2 |
90586523 | 208 | |
9dd813c1 JK |
209 | /* |
210 | * Inode / vfsmount point to this structure which tracks all marks attached to | |
e911d8af | 211 | * the inode / vfsmount. The reference to inode / vfsmount is held by this |
08991e83 JK |
212 | * structure. We destroy this structure when there are no more marks attached |
213 | * to it. The structure is protected by fsnotify_mark_srcu. | |
9dd813c1 JK |
214 | */ |
215 | struct fsnotify_mark_connector { | |
04662cab | 216 | spinlock_t lock; |
86ffe245 JK |
217 | #define FSNOTIFY_OBJ_TYPE_INODE 0x01 |
218 | #define FSNOTIFY_OBJ_TYPE_VFSMOUNT 0x02 | |
2e37c6ca JK |
219 | #define FSNOTIFY_OBJ_ALL_TYPES (FSNOTIFY_OBJ_TYPE_INODE | \ |
220 | FSNOTIFY_OBJ_TYPE_VFSMOUNT) | |
86ffe245 JK |
221 | unsigned int flags; /* Type of object [lock] */ |
222 | union { /* Object pointer [lock] */ | |
223 | struct inode *inode; | |
224 | struct vfsmount *mnt; | |
08991e83 JK |
225 | /* Used listing heads to free after srcu period expires */ |
226 | struct fsnotify_mark_connector *destroy_next; | |
227 | }; | |
b75e7fe9 | 228 | struct hlist_head list; |
9dd813c1 JK |
229 | }; |
230 | ||
3be25f49 | 231 | /* |
1e39fc01 | 232 | * A mark is simply an object attached to an in core inode which allows an |
3be25f49 EP |
233 | * fsnotify listener to indicate they are either no longer interested in events |
234 | * of a type matching mask or only interested in those events. | |
235 | * | |
1e39fc01 JK |
236 | * These are flushed when an inode is evicted from core and may be flushed |
237 | * when the inode is modified (as seen by fsnotify_access). Some fsnotify | |
238 | * users (such as dnotify) will flush these when the open fd is closed and not | |
239 | * at inode eviction or modification. | |
240 | * | |
241 | * Text in brackets is showing the lock(s) protecting modifications of a | |
242 | * particular entry. obj_lock means either inode->i_lock or | |
243 | * mnt->mnt_root->d_lock depending on the mark type. | |
3be25f49 | 244 | */ |
e61ce867 | 245 | struct fsnotify_mark { |
1e39fc01 JK |
246 | /* Mask this mark is for [mark->lock, group->mark_mutex] */ |
247 | __u32 mask; | |
248 | /* We hold one for presence in g_list. Also one ref for each 'thing' | |
3be25f49 | 249 | * in kernel that found and may be using this mark. */ |
ab97f873 | 250 | refcount_t refcnt; |
1e39fc01 JK |
251 | /* Group this mark is for. Set on mark creation, stable until last ref |
252 | * is dropped */ | |
253 | struct fsnotify_group *group; | |
254 | /* List of marks by group->i_fsnotify_marks. Also reused for queueing | |
255 | * mark into destroy_list when it's waiting for the end of SRCU period | |
256 | * before it can be freed. [group->mark_mutex] */ | |
13d34ac6 | 257 | struct list_head g_list; |
1e39fc01 JK |
258 | /* Protects inode / mnt pointers, flags, masks */ |
259 | spinlock_t lock; | |
6b3f05d2 | 260 | /* List of marks for inode / vfsmount [connector->lock, mark ref] */ |
1e39fc01 | 261 | struct hlist_node obj_list; |
6b3f05d2 | 262 | /* Head of list of marks for an object [mark ref] */ |
86ffe245 | 263 | struct fsnotify_mark_connector *connector; |
1e39fc01 JK |
264 | /* Events types to ignore [mark->lock, group->mark_mutex] */ |
265 | __u32 ignored_mask; | |
e911d8af JK |
266 | #define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01 |
267 | #define FSNOTIFY_MARK_FLAG_ALIVE 0x02 | |
268 | #define FSNOTIFY_MARK_FLAG_ATTACHED 0x04 | |
1e39fc01 | 269 | unsigned int flags; /* flags [mark->lock] */ |
3be25f49 EP |
270 | }; |
271 | ||
90586523 EP |
272 | #ifdef CONFIG_FSNOTIFY |
273 | ||
274 | /* called from the vfs helpers */ | |
275 | ||
276 | /* main fsnotify call to send events */ | |
e637835e | 277 | extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is, |
c4ec54b4 | 278 | const unsigned char *name, u32 cookie); |
12c7f9dc | 279 | extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask); |
3be25f49 | 280 | extern void __fsnotify_inode_delete(struct inode *inode); |
ca9c726e | 281 | extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt); |
47882c6f | 282 | extern u32 fsnotify_get_cookie(void); |
90586523 | 283 | |
c28f7e56 EP |
284 | static inline int fsnotify_inode_watches_children(struct inode *inode) |
285 | { | |
286 | /* FS_EVENT_ON_CHILD is set if the inode may care */ | |
287 | if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD)) | |
288 | return 0; | |
289 | /* this inode might care about child events, does it care about the | |
290 | * specific set of events that can happen on a child? */ | |
291 | return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD; | |
292 | } | |
293 | ||
294 | /* | |
295 | * Update the dentry with a flag indicating the interest of its parent to receive | |
296 | * filesystem events when those events happens to this dentry->d_inode. | |
297 | */ | |
affda484 | 298 | static inline void fsnotify_update_flags(struct dentry *dentry) |
c28f7e56 | 299 | { |
c28f7e56 EP |
300 | assert_spin_locked(&dentry->d_lock); |
301 | ||
b5c84bf6 NP |
302 | /* |
303 | * Serialisation of setting PARENT_WATCHED on the dentries is provided | |
304 | * by d_lock. If inotify_inode_watched changes after we have taken | |
305 | * d_lock, the following __fsnotify_update_child_dentry_flags call will | |
306 | * find our entry, so it will spin until we complete here, and update | |
307 | * us with the new state. | |
308 | */ | |
affda484 | 309 | if (fsnotify_inode_watches_children(dentry->d_parent->d_inode)) |
c28f7e56 EP |
310 | dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; |
311 | else | |
312 | dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; | |
313 | } | |
314 | ||
90586523 EP |
315 | /* called from fsnotify listeners, such as fanotify or dnotify */ |
316 | ||
98612952 | 317 | /* create a new group */ |
0d2e2a1d | 318 | extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops); |
98612952 LS |
319 | /* get reference to a group */ |
320 | extern void fsnotify_get_group(struct fsnotify_group *group); | |
ffab8340 | 321 | /* drop reference on a group from fsnotify_alloc_group */ |
90586523 | 322 | extern void fsnotify_put_group(struct fsnotify_group *group); |
12703dbf JK |
323 | /* group destruction begins, stop queuing new events */ |
324 | extern void fsnotify_group_stop_queueing(struct fsnotify_group *group); | |
d8153d4d LS |
325 | /* destroy group */ |
326 | extern void fsnotify_destroy_group(struct fsnotify_group *group); | |
0a6b6bd5 EP |
327 | /* fasync handler function */ |
328 | extern int fsnotify_fasync(int fd, struct file *file, int on); | |
7053aee2 JK |
329 | /* Free event from memory */ |
330 | extern void fsnotify_destroy_event(struct fsnotify_group *group, | |
331 | struct fsnotify_event *event); | |
a2d8bc6c | 332 | /* attach the event to the group notification queue */ |
8ba8fa91 JK |
333 | extern int fsnotify_add_event(struct fsnotify_group *group, |
334 | struct fsnotify_event *event, | |
335 | int (*merge)(struct list_head *, | |
336 | struct fsnotify_event *)); | |
a2d8bc6c EP |
337 | /* true if the group notification queue is empty */ |
338 | extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group); | |
339 | /* return, but do not dequeue the first event on the notification queue */ | |
8ba8fa91 | 340 | extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group); |
e4aff117 | 341 | /* return AND dequeue the first event on the notification queue */ |
8ba8fa91 | 342 | extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group); |
a2d8bc6c | 343 | |
3be25f49 EP |
344 | /* functions used to manipulate the marks attached to inodes */ |
345 | ||
a242677b JK |
346 | /* Calculate mask of events for a list of marks */ |
347 | extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn); | |
7b129323 | 348 | extern void fsnotify_init_mark(struct fsnotify_mark *mark, |
054c636e | 349 | struct fsnotify_group *group); |
b1362edf JK |
350 | /* Find mark belonging to given group in the list of marks */ |
351 | extern struct fsnotify_mark *fsnotify_find_mark( | |
352 | struct fsnotify_mark_connector __rcu **connp, | |
353 | struct fsnotify_group *group); | |
7b129323 JK |
354 | /* attach the mark to the inode or vfsmount */ |
355 | extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct inode *inode, | |
356 | struct vfsmount *mnt, int allow_dups); | |
357 | extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark, | |
d5a335b8 | 358 | struct inode *inode, struct vfsmount *mnt, int allow_dups); |
e2a29943 LS |
359 | /* given a group and a mark, flag mark to be freed when all references are dropped */ |
360 | extern void fsnotify_destroy_mark(struct fsnotify_mark *mark, | |
361 | struct fsnotify_group *group); | |
4712e722 JK |
362 | /* detach mark from inode / mount list, group list, drop inode reference */ |
363 | extern void fsnotify_detach_mark(struct fsnotify_mark *mark); | |
364 | /* free mark */ | |
365 | extern void fsnotify_free_mark(struct fsnotify_mark *mark); | |
86ffe245 | 366 | /* run all the marks in a group, and clear all of the marks attached to given object type */ |
18f2e0d3 | 367 | extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type); |
416bcdbc JK |
368 | /* run all the marks in a group, and clear all of the vfsmount marks */ |
369 | static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group) | |
370 | { | |
18f2e0d3 | 371 | fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT); |
416bcdbc JK |
372 | } |
373 | /* run all the marks in a group, and clear all of the inode marks */ | |
374 | static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group) | |
375 | { | |
18f2e0d3 | 376 | fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE); |
416bcdbc | 377 | } |
841bdc10 EP |
378 | extern void fsnotify_get_mark(struct fsnotify_mark *mark); |
379 | extern void fsnotify_put_mark(struct fsnotify_mark *mark); | |
74278da9 | 380 | extern void fsnotify_unmount_inodes(struct super_block *sb); |
abc77577 JK |
381 | extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info); |
382 | extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info); | |
3be25f49 | 383 | |
90586523 | 384 | /* put here because inotify does some weird stuff when destroying watches */ |
7053aee2 JK |
385 | extern void fsnotify_init_event(struct fsnotify_event *event, |
386 | struct inode *to_tell, u32 mask); | |
b4e4e140 | 387 | |
90586523 EP |
388 | #else |
389 | ||
e637835e | 390 | static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is, |
c4ec54b4 EP |
391 | const unsigned char *name, u32 cookie) |
392 | { | |
393 | return 0; | |
394 | } | |
3be25f49 | 395 | |
12c7f9dc | 396 | static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask) |
52420392 EP |
397 | { |
398 | return 0; | |
399 | } | |
c28f7e56 | 400 | |
3be25f49 EP |
401 | static inline void __fsnotify_inode_delete(struct inode *inode) |
402 | {} | |
403 | ||
ca9c726e AG |
404 | static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt) |
405 | {} | |
406 | ||
affda484 | 407 | static inline void fsnotify_update_flags(struct dentry *dentry) |
c28f7e56 EP |
408 | {} |
409 | ||
47882c6f EP |
410 | static inline u32 fsnotify_get_cookie(void) |
411 | { | |
412 | return 0; | |
413 | } | |
414 | ||
74278da9 | 415 | static inline void fsnotify_unmount_inodes(struct super_block *sb) |
164bc619 EP |
416 | {} |
417 | ||
90586523 EP |
418 | #endif /* CONFIG_FSNOTIFY */ |
419 | ||
420 | #endif /* __KERNEL __ */ | |
421 | ||
422 | #endif /* __LINUX_FSNOTIFY_BACKEND_H */ |