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1 : : /*
2 : : * Filesystem access notification for Linux
3 : : *
4 : : * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
5 : : */
6 : :
7 : : #ifndef __LINUX_FSNOTIFY_BACKEND_H
8 : : #define __LINUX_FSNOTIFY_BACKEND_H
9 : :
10 : : #ifdef __KERNEL__
11 : :
12 : : #include <linux/idr.h> /* inotify uses this */
13 : : #include <linux/fs.h> /* struct inode */
14 : : #include <linux/list.h>
15 : : #include <linux/path.h> /* struct path */
16 : : #include <linux/spinlock.h>
17 : : #include <linux/types.h>
18 : :
19 : : #include <linux/atomic.h>
20 : :
21 : : /*
22 : : * IN_* from inotfy.h lines up EXACTLY with FS_*, this is so we can easily
23 : : * convert between them. dnotify only needs conversion at watch creation
24 : : * so no perf loss there. fanotify isn't defined yet, so it can use the
25 : : * wholes if it needs more events.
26 : : */
27 : : #define FS_ACCESS 0x00000001 /* File was accessed */
28 : : #define FS_MODIFY 0x00000002 /* File was modified */
29 : : #define FS_ATTRIB 0x00000004 /* Metadata changed */
30 : : #define FS_CLOSE_WRITE 0x00000008 /* Writtable file was closed */
31 : : #define FS_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
32 : : #define FS_OPEN 0x00000020 /* File was opened */
33 : : #define FS_MOVED_FROM 0x00000040 /* File was moved from X */
34 : : #define FS_MOVED_TO 0x00000080 /* File was moved to Y */
35 : : #define FS_CREATE 0x00000100 /* Subfile was created */
36 : : #define FS_DELETE 0x00000200 /* Subfile was deleted */
37 : : #define FS_DELETE_SELF 0x00000400 /* Self was deleted */
38 : : #define FS_MOVE_SELF 0x00000800 /* Self was moved */
39 : :
40 : : #define FS_UNMOUNT 0x00002000 /* inode on umount fs */
41 : : #define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
42 : : #define FS_IN_IGNORED 0x00008000 /* last inotify event here */
43 : :
44 : : #define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
45 : : #define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */
46 : :
47 : : #define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
48 : : #define FS_ISDIR 0x40000000 /* event occurred against dir */
49 : : #define FS_IN_ONESHOT 0x80000000 /* only send event once */
50 : :
51 : : #define FS_DN_RENAME 0x10000000 /* file renamed */
52 : : #define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */
53 : :
54 : : /* This inode cares about things that happen to its children. Always set for
55 : : * dnotify and inotify. */
56 : : #define FS_EVENT_ON_CHILD 0x08000000
57 : :
58 : : /* This is a list of all events that may get sent to a parernt based on fs event
59 : : * happening to inodes inside that directory */
60 : : #define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
61 : : FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
62 : : FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
63 : : FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM)
64 : :
65 : : #define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
66 : :
67 : : #define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
68 : :
69 : : #define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
70 : : FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \
71 : : FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
72 : : FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
73 : : FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
74 : : FS_OPEN_PERM | FS_ACCESS_PERM | FS_EXCL_UNLINK | \
75 : : FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME | \
76 : : FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
77 : :
78 : : struct fsnotify_group;
79 : : struct fsnotify_event;
80 : : struct fsnotify_mark;
81 : : struct fsnotify_event_private_data;
82 : :
83 : : /*
84 : : * Each group much define these ops. The fsnotify infrastructure will call
85 : : * these operations for each relevant group.
86 : : *
87 : : * should_send_event - given a group, inode, and mask this function determines
88 : : * if the group is interested in this event.
89 : : * handle_event - main call for a group to handle an fs event
90 : : * free_group_priv - called when a group refcnt hits 0 to clean up the private union
91 : : * freeing_mark - called when a mark is being destroyed for some reason. The group
92 : : * MUST be holding a reference on each mark and that reference must be
93 : : * dropped in this function. inotify uses this function to send
94 : : * userspace messages that marks have been removed.
95 : : */
96 : : struct fsnotify_ops {
97 : : bool (*should_send_event)(struct fsnotify_group *group, struct inode *inode,
98 : : struct fsnotify_mark *inode_mark,
99 : : struct fsnotify_mark *vfsmount_mark,
100 : : __u32 mask, void *data, int data_type);
101 : : int (*handle_event)(struct fsnotify_group *group,
102 : : struct fsnotify_mark *inode_mark,
103 : : struct fsnotify_mark *vfsmount_mark,
104 : : struct fsnotify_event *event);
105 : : void (*free_group_priv)(struct fsnotify_group *group);
106 : : void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
107 : : void (*free_event_priv)(struct fsnotify_event_private_data *priv);
108 : : };
109 : :
110 : : /*
111 : : * A group is a "thing" that wants to receive notification about filesystem
112 : : * events. The mask holds the subset of event types this group cares about.
113 : : * refcnt on a group is up to the implementor and at any moment if it goes 0
114 : : * everything will be cleaned up.
115 : : */
116 : : struct fsnotify_group {
117 : : /*
118 : : * How the refcnt is used is up to each group. When the refcnt hits 0
119 : : * fsnotify will clean up all of the resources associated with this group.
120 : : * As an example, the dnotify group will always have a refcnt=1 and that
121 : : * will never change. Inotify, on the other hand, has a group per
122 : : * inotify_init() and the refcnt will hit 0 only when that fd has been
123 : : * closed.
124 : : */
125 : : atomic_t refcnt; /* things with interest in this group */
126 : :
127 : : const struct fsnotify_ops *ops; /* how this group handles things */
128 : :
129 : : /* needed to send notification to userspace */
130 : : struct mutex notification_mutex; /* protect the notification_list */
131 : : struct list_head notification_list; /* list of event_holder this group needs to send to userspace */
132 : : wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */
133 : : unsigned int q_len; /* events on the queue */
134 : : unsigned int max_events; /* maximum events allowed on the list */
135 : : /*
136 : : * Valid fsnotify group priorities. Events are send in order from highest
137 : : * priority to lowest priority. We default to the lowest priority.
138 : : */
139 : : #define FS_PRIO_0 0 /* normal notifiers, no permissions */
140 : : #define FS_PRIO_1 1 /* fanotify content based access control */
141 : : #define FS_PRIO_2 2 /* fanotify pre-content access */
142 : : unsigned int priority;
143 : :
144 : : /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */
145 : : struct mutex mark_mutex; /* protect marks_list */
146 : : atomic_t num_marks; /* 1 for each mark and 1 for not being
147 : : * past the point of no return when freeing
148 : : * a group */
149 : : struct list_head marks_list; /* all inode marks for this group */
150 : :
151 : : struct fasync_struct *fsn_fa; /* async notification */
152 : :
153 : : /* groups can define private fields here or use the void *private */
154 : : union {
155 : : void *private;
156 : : #ifdef CONFIG_INOTIFY_USER
157 : : struct inotify_group_private_data {
158 : : spinlock_t idr_lock;
159 : : struct idr idr;
160 : : struct user_struct *user;
161 : : } inotify_data;
162 : : #endif
163 : : #ifdef CONFIG_FANOTIFY
164 : : struct fanotify_group_private_data {
165 : : #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
166 : : /* allows a group to block waiting for a userspace response */
167 : : struct mutex access_mutex;
168 : : struct list_head access_list;
169 : : wait_queue_head_t access_waitq;
170 : : atomic_t bypass_perm;
171 : : #endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */
172 : : int f_flags;
173 : : unsigned int max_marks;
174 : : struct user_struct *user;
175 : : } fanotify_data;
176 : : #endif /* CONFIG_FANOTIFY */
177 : : };
178 : : };
179 : :
180 : : /*
181 : : * A single event can be queued in multiple group->notification_lists.
182 : : *
183 : : * each group->notification_list will point to an event_holder which in turns points
184 : : * to the actual event that needs to be sent to userspace.
185 : : *
186 : : * Seemed cheaper to create a refcnt'd event and a small holder for every group
187 : : * than create a different event for every group
188 : : *
189 : : */
190 : : struct fsnotify_event_holder {
191 : : struct fsnotify_event *event;
192 : : struct list_head event_list;
193 : : };
194 : :
195 : : /*
196 : : * Inotify needs to tack data onto an event. This struct lets us later find the
197 : : * correct private data of the correct group.
198 : : */
199 : : struct fsnotify_event_private_data {
200 : : struct fsnotify_group *group;
201 : : struct list_head event_list;
202 : : };
203 : :
204 : : /*
205 : : * all of the information about the original object we want to now send to
206 : : * a group. If you want to carry more info from the accessing task to the
207 : : * listener this structure is where you need to be adding fields.
208 : : */
209 : : struct fsnotify_event {
210 : : /*
211 : : * If we create an event we are also likely going to need a holder
212 : : * to link to a group. So embed one holder in the event. Means only
213 : : * one allocation for the common case where we only have one group
214 : : */
215 : : struct fsnotify_event_holder holder;
216 : : spinlock_t lock; /* protection for the associated event_holder and private_list */
217 : : /* to_tell may ONLY be dereferenced during handle_event(). */
218 : : struct inode *to_tell; /* either the inode the event happened to or its parent */
219 : : /*
220 : : * depending on the event type we should have either a path or inode
221 : : * We hold a reference on path, but NOT on inode. Since we have the ref on
222 : : * the path, it may be dereferenced at any point during this object's
223 : : * lifetime. That reference is dropped when this object's refcnt hits
224 : : * 0. If this event contains an inode instead of a path, the inode may
225 : : * ONLY be used during handle_event().
226 : : */
227 : : union {
228 : : struct path path;
229 : : struct inode *inode;
230 : : };
231 : : /* when calling fsnotify tell it if the data is a path or inode */
232 : : #define FSNOTIFY_EVENT_NONE 0
233 : : #define FSNOTIFY_EVENT_PATH 1
234 : : #define FSNOTIFY_EVENT_INODE 2
235 : : int data_type; /* which of the above union we have */
236 : : atomic_t refcnt; /* how many groups still are using/need to send this event */
237 : : __u32 mask; /* the type of access, bitwise OR for FS_* event types */
238 : :
239 : : u32 sync_cookie; /* used to corrolate events, namely inotify mv events */
240 : : const unsigned char *file_name;
241 : : size_t name_len;
242 : : struct pid *tgid;
243 : :
244 : : #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
245 : : __u32 response; /* userspace answer to question */
246 : : #endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */
247 : :
248 : : struct list_head private_data_list; /* groups can store private data here */
249 : : };
250 : :
251 : : /*
252 : : * Inode specific fields in an fsnotify_mark
253 : : */
254 : : struct fsnotify_inode_mark {
255 : : struct inode *inode; /* inode this mark is associated with */
256 : : struct hlist_node i_list; /* list of marks by inode->i_fsnotify_marks */
257 : : struct list_head free_i_list; /* tmp list used when freeing this mark */
258 : : };
259 : :
260 : : /*
261 : : * Mount point specific fields in an fsnotify_mark
262 : : */
263 : : struct fsnotify_vfsmount_mark {
264 : : struct vfsmount *mnt; /* vfsmount this mark is associated with */
265 : : struct hlist_node m_list; /* list of marks by inode->i_fsnotify_marks */
266 : : struct list_head free_m_list; /* tmp list used when freeing this mark */
267 : : };
268 : :
269 : : /*
270 : : * a mark is simply an object attached to an in core inode which allows an
271 : : * fsnotify listener to indicate they are either no longer interested in events
272 : : * of a type matching mask or only interested in those events.
273 : : *
274 : : * these are flushed when an inode is evicted from core and may be flushed
275 : : * when the inode is modified (as seen by fsnotify_access). Some fsnotify users
276 : : * (such as dnotify) will flush these when the open fd is closed and not at
277 : : * inode eviction or modification.
278 : : */
279 : : struct fsnotify_mark {
280 : : __u32 mask; /* mask this mark is for */
281 : : /* we hold ref for each i_list and g_list. also one ref for each 'thing'
282 : : * in kernel that found and may be using this mark. */
283 : : atomic_t refcnt; /* active things looking at this mark */
284 : : struct fsnotify_group *group; /* group this mark is for */
285 : : struct list_head g_list; /* list of marks by group->i_fsnotify_marks */
286 : : spinlock_t lock; /* protect group and inode */
287 : : union {
288 : : struct fsnotify_inode_mark i;
289 : : struct fsnotify_vfsmount_mark m;
290 : : };
291 : : __u32 ignored_mask; /* events types to ignore */
292 : : #define FSNOTIFY_MARK_FLAG_INODE 0x01
293 : : #define FSNOTIFY_MARK_FLAG_VFSMOUNT 0x02
294 : : #define FSNOTIFY_MARK_FLAG_OBJECT_PINNED 0x04
295 : : #define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x08
296 : : #define FSNOTIFY_MARK_FLAG_ALIVE 0x10
297 : : unsigned int flags; /* vfsmount or inode mark? */
298 : : struct list_head destroy_list;
299 : : void (*free_mark)(struct fsnotify_mark *mark); /* called on final put+free */
300 : : };
301 : :
302 : : #ifdef CONFIG_FSNOTIFY
303 : :
304 : : /* called from the vfs helpers */
305 : :
306 : : /* main fsnotify call to send events */
307 : : extern int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
308 : : const unsigned char *name, u32 cookie);
309 : : extern int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask);
310 : : extern void __fsnotify_inode_delete(struct inode *inode);
311 : : extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
312 : : extern u32 fsnotify_get_cookie(void);
313 : :
314 : : static inline int fsnotify_inode_watches_children(struct inode *inode)
315 : : {
316 : : /* FS_EVENT_ON_CHILD is set if the inode may care */
317 [ + + ][ + + ]: 2965451 : if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD))
[ + + ][ + + ]
318 : : return 0;
319 : : /* this inode might care about child events, does it care about the
320 : : * specific set of events that can happen on a child? */
321 : 729731 : return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD;
322 : : }
323 : :
324 : : /*
325 : : * Update the dentry with a flag indicating the interest of its parent to receive
326 : : * filesystem events when those events happens to this dentry->d_inode.
327 : : */
328 : : static inline void __fsnotify_update_dcache_flags(struct dentry *dentry)
329 : : {
330 : : struct dentry *parent;
331 : :
332 [ - + ][ - + ]: 6388211 : assert_spin_locked(&dentry->d_lock);
333 : :
334 : : /*
335 : : * Serialisation of setting PARENT_WATCHED on the dentries is provided
336 : : * by d_lock. If inotify_inode_watched changes after we have taken
337 : : * d_lock, the following __fsnotify_update_child_dentry_flags call will
338 : : * find our entry, so it will spin until we complete here, and update
339 : : * us with the new state.
340 : : */
341 : 2253115 : parent = dentry->d_parent;
342 [ + - ][ + + ]: 4506155 : if (parent->d_inode && fsnotify_inode_watches_children(parent->d_inode))
[ + + ][ + + ]
343 : 17327 : dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
344 : : else
345 : 2235788 : dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
346 : : }
347 : :
348 : : /*
349 : : * fsnotify_d_instantiate - instantiate a dentry for inode
350 : : */
351 : : static inline void __fsnotify_d_instantiate(struct dentry *dentry, struct inode *inode)
352 : : {
353 [ + + ]: 3868709 : if (!inode)
354 : : return;
355 : :
356 : : spin_lock(&dentry->d_lock);
357 : : __fsnotify_update_dcache_flags(dentry);
358 : : spin_unlock(&dentry->d_lock);
359 : : }
360 : :
361 : : /* called from fsnotify listeners, such as fanotify or dnotify */
362 : :
363 : : /* create a new group */
364 : : extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
365 : : /* get reference to a group */
366 : : extern void fsnotify_get_group(struct fsnotify_group *group);
367 : : /* drop reference on a group from fsnotify_alloc_group */
368 : : extern void fsnotify_put_group(struct fsnotify_group *group);
369 : : /* destroy group */
370 : : extern void fsnotify_destroy_group(struct fsnotify_group *group);
371 : : /* fasync handler function */
372 : : extern int fsnotify_fasync(int fd, struct file *file, int on);
373 : : /* take a reference to an event */
374 : : extern void fsnotify_get_event(struct fsnotify_event *event);
375 : : extern void fsnotify_put_event(struct fsnotify_event *event);
376 : : /* find private data previously attached to an event and unlink it */
377 : : extern struct fsnotify_event_private_data *fsnotify_remove_priv_from_event(struct fsnotify_group *group,
378 : : struct fsnotify_event *event);
379 : :
380 : : /* attach the event to the group notification queue */
381 : : extern struct fsnotify_event *fsnotify_add_notify_event(struct fsnotify_group *group,
382 : : struct fsnotify_event *event,
383 : : struct fsnotify_event_private_data *priv,
384 : : struct fsnotify_event *(*merge)(struct list_head *,
385 : : struct fsnotify_event *));
386 : : /* true if the group notification queue is empty */
387 : : extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
388 : : /* return, but do not dequeue the first event on the notification queue */
389 : : extern struct fsnotify_event *fsnotify_peek_notify_event(struct fsnotify_group *group);
390 : : /* return AND dequeue the first event on the notification queue */
391 : : extern struct fsnotify_event *fsnotify_remove_notify_event(struct fsnotify_group *group);
392 : :
393 : : /* functions used to manipulate the marks attached to inodes */
394 : :
395 : : /* run all marks associated with a vfsmount and update mnt->mnt_fsnotify_mask */
396 : : extern void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt);
397 : : /* run all marks associated with an inode and update inode->i_fsnotify_mask */
398 : : extern void fsnotify_recalc_inode_mask(struct inode *inode);
399 : : extern void fsnotify_init_mark(struct fsnotify_mark *mark, void (*free_mark)(struct fsnotify_mark *mark));
400 : : /* find (and take a reference) to a mark associated with group and inode */
401 : : extern struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group, struct inode *inode);
402 : : /* find (and take a reference) to a mark associated with group and vfsmount */
403 : : extern struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, struct vfsmount *mnt);
404 : : /* copy the values from old into new */
405 : : extern void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old);
406 : : /* set the ignored_mask of a mark */
407 : : extern void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask);
408 : : /* set the mask of a mark (might pin the object into memory */
409 : : extern void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask);
410 : : /* attach the mark to both the group and the inode */
411 : : extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
412 : : struct inode *inode, struct vfsmount *mnt, int allow_dups);
413 : : extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark, struct fsnotify_group *group,
414 : : struct inode *inode, struct vfsmount *mnt, int allow_dups);
415 : : /* given a group and a mark, flag mark to be freed when all references are dropped */
416 : : extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
417 : : struct fsnotify_group *group);
418 : : extern void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark,
419 : : struct fsnotify_group *group);
420 : : /* run all the marks in a group, and clear all of the vfsmount marks */
421 : : extern void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group);
422 : : /* run all the marks in a group, and clear all of the inode marks */
423 : : extern void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group);
424 : : /* run all the marks in a group, and clear all of the marks where mark->flags & flags is true*/
425 : : extern void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group, unsigned int flags);
426 : : /* run all the marks in a group, and flag them to be freed */
427 : : extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group);
428 : : extern void fsnotify_get_mark(struct fsnotify_mark *mark);
429 : : extern void fsnotify_put_mark(struct fsnotify_mark *mark);
430 : : extern void fsnotify_unmount_inodes(struct list_head *list);
431 : :
432 : : /* put here because inotify does some weird stuff when destroying watches */
433 : : extern struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
434 : : void *data, int data_is,
435 : : const unsigned char *name,
436 : : u32 cookie, gfp_t gfp);
437 : :
438 : : /* fanotify likes to change events after they are on lists... */
439 : : extern struct fsnotify_event *fsnotify_clone_event(struct fsnotify_event *old_event);
440 : : extern int fsnotify_replace_event(struct fsnotify_event_holder *old_holder,
441 : : struct fsnotify_event *new_event);
442 : :
443 : : #else
444 : :
445 : : static inline int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
446 : : const unsigned char *name, u32 cookie)
447 : : {
448 : : return 0;
449 : : }
450 : :
451 : : static inline int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
452 : : {
453 : : return 0;
454 : : }
455 : :
456 : : static inline void __fsnotify_inode_delete(struct inode *inode)
457 : : {}
458 : :
459 : : static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
460 : : {}
461 : :
462 : : static inline void __fsnotify_update_dcache_flags(struct dentry *dentry)
463 : : {}
464 : :
465 : : static inline void __fsnotify_d_instantiate(struct dentry *dentry, struct inode *inode)
466 : : {}
467 : :
468 : : static inline u32 fsnotify_get_cookie(void)
469 : : {
470 : : return 0;
471 : : }
472 : :
473 : : static inline void fsnotify_unmount_inodes(struct list_head *list)
474 : : {}
475 : :
476 : : #endif /* CONFIG_FSNOTIFY */
477 : :
478 : : #endif /* __KERNEL __ */
479 : :
480 : : #endif /* __LINUX_FSNOTIFY_BACKEND_H */
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