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c82ee6d3 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
90586523 EP |
2 | /* |
3 | * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com> | |
90586523 EP |
4 | */ |
5 | ||
6 | #include <linux/dcache.h> | |
7 | #include <linux/fs.h> | |
5a0e3ad6 | 8 | #include <linux/gfp.h> |
90586523 EP |
9 | #include <linux/init.h> |
10 | #include <linux/module.h> | |
7131485a | 11 | #include <linux/mount.h> |
90586523 EP |
12 | #include <linux/srcu.h> |
13 | ||
14 | #include <linux/fsnotify_backend.h> | |
15 | #include "fsnotify.h" | |
16 | ||
3be25f49 EP |
17 | /* |
18 | * Clear all of the marks on an inode when it is being evicted from core | |
19 | */ | |
20 | void __fsnotify_inode_delete(struct inode *inode) | |
21 | { | |
22 | fsnotify_clear_marks_by_inode(inode); | |
23 | } | |
24 | EXPORT_SYMBOL_GPL(__fsnotify_inode_delete); | |
25 | ||
ca9c726e AG |
26 | void __fsnotify_vfsmount_delete(struct vfsmount *mnt) |
27 | { | |
28 | fsnotify_clear_marks_by_mount(mnt); | |
29 | } | |
30 | ||
ebb3b47e JK |
31 | /** |
32 | * fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes. | |
33 | * @sb: superblock being unmounted. | |
34 | * | |
35 | * Called during unmount with no locks held, so needs to be safe against | |
36 | * concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block. | |
37 | */ | |
1e6cb723 | 38 | static void fsnotify_unmount_inodes(struct super_block *sb) |
ebb3b47e JK |
39 | { |
40 | struct inode *inode, *iput_inode = NULL; | |
41 | ||
42 | spin_lock(&sb->s_inode_list_lock); | |
43 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { | |
44 | /* | |
45 | * We cannot __iget() an inode in state I_FREEING, | |
46 | * I_WILL_FREE, or I_NEW which is fine because by that point | |
47 | * the inode cannot have any associated watches. | |
48 | */ | |
49 | spin_lock(&inode->i_lock); | |
50 | if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) { | |
51 | spin_unlock(&inode->i_lock); | |
52 | continue; | |
53 | } | |
54 | ||
55 | /* | |
56 | * If i_count is zero, the inode cannot have any watches and | |
1751e8a6 | 57 | * doing an __iget/iput with SB_ACTIVE clear would actually |
ebb3b47e JK |
58 | * evict all inodes with zero i_count from icache which is |
59 | * unnecessarily violent and may in fact be illegal to do. | |
1edc8eb2 ES |
60 | * However, we should have been called /after/ evict_inodes |
61 | * removed all zero refcount inodes, in any case. Test to | |
62 | * be sure. | |
ebb3b47e JK |
63 | */ |
64 | if (!atomic_read(&inode->i_count)) { | |
65 | spin_unlock(&inode->i_lock); | |
66 | continue; | |
67 | } | |
68 | ||
69 | __iget(inode); | |
70 | spin_unlock(&inode->i_lock); | |
71 | spin_unlock(&sb->s_inode_list_lock); | |
72 | ||
73 | if (iput_inode) | |
74 | iput(iput_inode); | |
75 | ||
76 | /* for each watch, send FS_UNMOUNT and then remove it */ | |
82ace1ef | 77 | fsnotify_inode(inode, FS_UNMOUNT); |
ebb3b47e JK |
78 | |
79 | fsnotify_inode_delete(inode); | |
80 | ||
81 | iput_inode = inode; | |
82 | ||
04646aeb | 83 | cond_resched(); |
ebb3b47e JK |
84 | spin_lock(&sb->s_inode_list_lock); |
85 | } | |
86 | spin_unlock(&sb->s_inode_list_lock); | |
87 | ||
88 | if (iput_inode) | |
89 | iput(iput_inode); | |
721fb6fb JK |
90 | /* Wait for outstanding inode references from connectors */ |
91 | wait_var_event(&sb->s_fsnotify_inode_refs, | |
92 | !atomic_long_read(&sb->s_fsnotify_inode_refs)); | |
ebb3b47e JK |
93 | } |
94 | ||
1e6cb723 AG |
95 | void fsnotify_sb_delete(struct super_block *sb) |
96 | { | |
97 | fsnotify_unmount_inodes(sb); | |
98 | fsnotify_clear_marks_by_sb(sb); | |
99 | } | |
100 | ||
c28f7e56 EP |
101 | /* |
102 | * Given an inode, first check if we care what happens to our children. Inotify | |
103 | * and dnotify both tell their parents about events. If we care about any event | |
104 | * on a child we run all of our children and set a dentry flag saying that the | |
105 | * parent cares. Thus when an event happens on a child it can quickly tell if | |
106 | * if there is a need to find a parent and send the event to the parent. | |
107 | */ | |
108 | void __fsnotify_update_child_dentry_flags(struct inode *inode) | |
109 | { | |
110 | struct dentry *alias; | |
111 | int watched; | |
112 | ||
113 | if (!S_ISDIR(inode->i_mode)) | |
114 | return; | |
115 | ||
116 | /* determine if the children should tell inode about their events */ | |
117 | watched = fsnotify_inode_watches_children(inode); | |
118 | ||
873feea0 | 119 | spin_lock(&inode->i_lock); |
c28f7e56 EP |
120 | /* run all of the dentries associated with this inode. Since this is a |
121 | * directory, there damn well better only be one item on this list */ | |
946e51f2 | 122 | hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { |
c28f7e56 EP |
123 | struct dentry *child; |
124 | ||
125 | /* run all of the children of the original inode and fix their | |
126 | * d_flags to indicate parental interest (their parent is the | |
127 | * original inode) */ | |
2fd6b7f5 | 128 | spin_lock(&alias->d_lock); |
946e51f2 | 129 | list_for_each_entry(child, &alias->d_subdirs, d_child) { |
c28f7e56 EP |
130 | if (!child->d_inode) |
131 | continue; | |
132 | ||
2fd6b7f5 | 133 | spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); |
c28f7e56 EP |
134 | if (watched) |
135 | child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; | |
136 | else | |
137 | child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; | |
138 | spin_unlock(&child->d_lock); | |
139 | } | |
2fd6b7f5 | 140 | spin_unlock(&alias->d_lock); |
c28f7e56 | 141 | } |
873feea0 | 142 | spin_unlock(&inode->i_lock); |
c28f7e56 EP |
143 | } |
144 | ||
9b93f331 AG |
145 | /* Are inode/sb/mount interested in parent and name info with this event? */ |
146 | static bool fsnotify_event_needs_parent(struct inode *inode, struct mount *mnt, | |
147 | __u32 mask) | |
148 | { | |
149 | __u32 marks_mask = 0; | |
150 | ||
151 | /* We only send parent/name to inode/sb/mount for events on non-dir */ | |
152 | if (mask & FS_ISDIR) | |
153 | return false; | |
154 | ||
155 | /* Did either inode/sb/mount subscribe for events with parent/name? */ | |
156 | marks_mask |= fsnotify_parent_needed_mask(inode->i_fsnotify_mask); | |
157 | marks_mask |= fsnotify_parent_needed_mask(inode->i_sb->s_fsnotify_mask); | |
158 | if (mnt) | |
159 | marks_mask |= fsnotify_parent_needed_mask(mnt->mnt_fsnotify_mask); | |
160 | ||
161 | /* Did they subscribe for this event with parent/name info? */ | |
162 | return mask & marks_mask; | |
163 | } | |
164 | ||
c738fbab AG |
165 | /* |
166 | * Notify this dentry's parent about a child's events with child name info | |
9b93f331 AG |
167 | * if parent is watching or if inode/sb/mount are interested in events with |
168 | * parent and name info. | |
169 | * | |
170 | * Notify only the child without name info if parent is not watching and | |
171 | * inode/sb/mount are not interested in events with parent and name info. | |
c738fbab | 172 | */ |
71d73410 | 173 | int __fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data, |
c738fbab | 174 | int data_type) |
c28f7e56 | 175 | { |
9b93f331 AG |
176 | const struct path *path = fsnotify_data_path(data, data_type); |
177 | struct mount *mnt = path ? real_mount(path->mnt) : NULL; | |
497b0c5a | 178 | struct inode *inode = d_inode(dentry); |
c28f7e56 | 179 | struct dentry *parent; |
9b93f331 | 180 | bool parent_watched = dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED; |
7372e79c | 181 | bool parent_needed, parent_interested; |
9b93f331 | 182 | __u32 p_mask; |
40a100d3 | 183 | struct inode *p_inode = NULL; |
497b0c5a AG |
184 | struct name_snapshot name; |
185 | struct qstr *file_name = NULL; | |
52420392 | 186 | int ret = 0; |
c28f7e56 | 187 | |
9b93f331 AG |
188 | /* |
189 | * Do inode/sb/mount care about parent and name info on non-dir? | |
190 | * Do they care about any event at all? | |
191 | */ | |
192 | if (!inode->i_fsnotify_marks && !inode->i_sb->s_fsnotify_marks && | |
193 | (!mnt || !mnt->mnt_fsnotify_marks) && !parent_watched) | |
194 | return 0; | |
195 | ||
497b0c5a | 196 | parent = NULL; |
7372e79c AG |
197 | parent_needed = fsnotify_event_needs_parent(inode, mnt, mask); |
198 | if (!parent_watched && !parent_needed) | |
497b0c5a | 199 | goto notify; |
c28f7e56 | 200 | |
9b93f331 | 201 | /* Does parent inode care about events on children? */ |
4d4eb366 | 202 | parent = dget_parent(dentry); |
c28f7e56 | 203 | p_inode = parent->d_inode; |
9b93f331 AG |
204 | p_mask = fsnotify_inode_watches_children(p_inode); |
205 | if (unlikely(parent_watched && !p_mask)) | |
4d4eb366 | 206 | __fsnotify_update_child_dentry_flags(p_inode); |
9b93f331 AG |
207 | |
208 | /* | |
209 | * Include parent/name in notification either if some notification | |
7372e79c | 210 | * groups require parent info or the parent is interested in this event. |
9b93f331 | 211 | */ |
7372e79c AG |
212 | parent_interested = mask & p_mask & ALL_FSNOTIFY_EVENTS; |
213 | if (parent_needed || parent_interested) { | |
497b0c5a AG |
214 | /* When notifying parent, child should be passed as data */ |
215 | WARN_ON_ONCE(inode != fsnotify_data_inode(data, data_type)); | |
49d31c2f | 216 | |
497b0c5a | 217 | /* Notify both parent and child with child name info */ |
49d31c2f | 218 | take_dentry_name_snapshot(&name, dentry); |
497b0c5a | 219 | file_name = &name.name; |
7372e79c | 220 | if (parent_interested) |
9b93f331 | 221 | mask |= FS_EVENT_ON_CHILD; |
c28f7e56 EP |
222 | } |
223 | ||
497b0c5a | 224 | notify: |
40a100d3 | 225 | ret = fsnotify(mask, data, data_type, p_inode, file_name, inode, 0); |
52420392 | 226 | |
497b0c5a AG |
227 | if (file_name) |
228 | release_dentry_name_snapshot(&name); | |
229 | dput(parent); | |
c738fbab | 230 | |
497b0c5a | 231 | return ret; |
c28f7e56 | 232 | } |
71d73410 | 233 | EXPORT_SYMBOL_GPL(__fsnotify_parent); |
c28f7e56 | 234 | |
b9a1b977 AG |
235 | static int fsnotify_handle_event(struct fsnotify_group *group, __u32 mask, |
236 | const void *data, int data_type, | |
237 | struct inode *dir, const struct qstr *name, | |
238 | u32 cookie, struct fsnotify_iter_info *iter_info) | |
239 | { | |
240 | struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info); | |
241 | struct fsnotify_mark *child_mark = fsnotify_iter_child_mark(iter_info); | |
242 | struct inode *inode = fsnotify_data_inode(data, data_type); | |
243 | const struct fsnotify_ops *ops = group->ops; | |
244 | int ret; | |
245 | ||
246 | if (WARN_ON_ONCE(!ops->handle_inode_event)) | |
247 | return 0; | |
248 | ||
249 | if (WARN_ON_ONCE(fsnotify_iter_sb_mark(iter_info)) || | |
250 | WARN_ON_ONCE(fsnotify_iter_vfsmount_mark(iter_info))) | |
251 | return 0; | |
252 | ||
253 | /* | |
254 | * An event can be sent on child mark iterator instead of inode mark | |
255 | * iterator because of other groups that have interest of this inode | |
256 | * and have marks on both parent and child. We can simplify this case. | |
257 | */ | |
258 | if (!inode_mark) { | |
259 | inode_mark = child_mark; | |
260 | child_mark = NULL; | |
261 | dir = NULL; | |
262 | name = NULL; | |
263 | } | |
264 | ||
265 | ret = ops->handle_inode_event(inode_mark, mask, inode, dir, name); | |
266 | if (ret || !child_mark) | |
267 | return ret; | |
268 | ||
269 | /* | |
270 | * Some events can be sent on both parent dir and child marks | |
271 | * (e.g. FS_ATTRIB). If both parent dir and child are watching, | |
272 | * report the event once to parent dir with name and once to child | |
273 | * without name. | |
274 | */ | |
275 | return ops->handle_inode_event(child_mark, mask, inode, NULL, NULL); | |
276 | } | |
277 | ||
b54cecf5 AG |
278 | static int send_to_group(__u32 mask, const void *data, int data_type, |
279 | struct inode *dir, const struct qstr *file_name, | |
280 | u32 cookie, struct fsnotify_iter_info *iter_info) | |
7131485a | 281 | { |
faa9560a | 282 | struct fsnotify_group *group = NULL; |
007d1e83 | 283 | __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS); |
92183a42 AG |
284 | __u32 marks_mask = 0; |
285 | __u32 marks_ignored_mask = 0; | |
3dca1a74 AG |
286 | struct fsnotify_mark *mark; |
287 | int type; | |
613a807f | 288 | |
5b0457ad | 289 | if (WARN_ON(!iter_info->report_mask)) |
faa9560a | 290 | return 0; |
ce8f76fb EP |
291 | |
292 | /* clear ignored on inode modification */ | |
293 | if (mask & FS_MODIFY) { | |
3dca1a74 AG |
294 | fsnotify_foreach_obj_type(type) { |
295 | if (!fsnotify_iter_should_report_type(iter_info, type)) | |
296 | continue; | |
297 | mark = iter_info->marks[type]; | |
298 | if (mark && | |
299 | !(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)) | |
300 | mark->ignored_mask = 0; | |
301 | } | |
ce8f76fb | 302 | } |
613a807f | 303 | |
3dca1a74 AG |
304 | fsnotify_foreach_obj_type(type) { |
305 | if (!fsnotify_iter_should_report_type(iter_info, type)) | |
306 | continue; | |
307 | mark = iter_info->marks[type]; | |
308 | /* does the object mark tell us to do something? */ | |
309 | if (mark) { | |
310 | group = mark->group; | |
311 | marks_mask |= mark->mask; | |
312 | marks_ignored_mask |= mark->ignored_mask; | |
313 | } | |
ce8f76fb EP |
314 | } |
315 | ||
b54cecf5 AG |
316 | pr_debug("%s: group=%p mask=%x marks_mask=%x marks_ignored_mask=%x data=%p data_type=%d dir=%p cookie=%d\n", |
317 | __func__, group, mask, marks_mask, marks_ignored_mask, | |
318 | data, data_type, dir, cookie); | |
faa9560a | 319 | |
92183a42 | 320 | if (!(test_mask & marks_mask & ~marks_ignored_mask)) |
613a807f EP |
321 | return 0; |
322 | ||
b9a1b977 AG |
323 | if (group->ops->handle_event) { |
324 | return group->ops->handle_event(group, mask, data, data_type, dir, | |
325 | file_name, cookie, iter_info); | |
326 | } | |
327 | ||
328 | return fsnotify_handle_event(group, mask, data, data_type, dir, | |
329 | file_name, cookie, iter_info); | |
7131485a EP |
330 | } |
331 | ||
3427ce71 MS |
332 | static struct fsnotify_mark *fsnotify_first_mark(struct fsnotify_mark_connector **connp) |
333 | { | |
334 | struct fsnotify_mark_connector *conn; | |
335 | struct hlist_node *node = NULL; | |
336 | ||
337 | conn = srcu_dereference(*connp, &fsnotify_mark_srcu); | |
338 | if (conn) | |
339 | node = srcu_dereference(conn->list.first, &fsnotify_mark_srcu); | |
340 | ||
341 | return hlist_entry_safe(node, struct fsnotify_mark, obj_list); | |
342 | } | |
343 | ||
344 | static struct fsnotify_mark *fsnotify_next_mark(struct fsnotify_mark *mark) | |
345 | { | |
346 | struct hlist_node *node = NULL; | |
347 | ||
348 | if (mark) | |
349 | node = srcu_dereference(mark->obj_list.next, | |
350 | &fsnotify_mark_srcu); | |
351 | ||
352 | return hlist_entry_safe(node, struct fsnotify_mark, obj_list); | |
353 | } | |
354 | ||
d9a6f30b AG |
355 | /* |
356 | * iter_info is a multi head priority queue of marks. | |
357 | * Pick a subset of marks from queue heads, all with the | |
358 | * same group and set the report_mask for selected subset. | |
359 | * Returns the report_mask of the selected subset. | |
360 | */ | |
361 | static unsigned int fsnotify_iter_select_report_types( | |
362 | struct fsnotify_iter_info *iter_info) | |
363 | { | |
47d9c7cc AG |
364 | struct fsnotify_group *max_prio_group = NULL; |
365 | struct fsnotify_mark *mark; | |
366 | int type; | |
367 | ||
368 | /* Choose max prio group among groups of all queue heads */ | |
369 | fsnotify_foreach_obj_type(type) { | |
370 | mark = iter_info->marks[type]; | |
371 | if (mark && | |
372 | fsnotify_compare_groups(max_prio_group, mark->group) > 0) | |
373 | max_prio_group = mark->group; | |
374 | } | |
d9a6f30b | 375 | |
47d9c7cc | 376 | if (!max_prio_group) |
d9a6f30b AG |
377 | return 0; |
378 | ||
47d9c7cc | 379 | /* Set the report mask for marks from same group as max prio group */ |
d9a6f30b | 380 | iter_info->report_mask = 0; |
47d9c7cc AG |
381 | fsnotify_foreach_obj_type(type) { |
382 | mark = iter_info->marks[type]; | |
383 | if (mark && | |
384 | fsnotify_compare_groups(max_prio_group, mark->group) == 0) | |
385 | fsnotify_iter_set_report_type(iter_info, type); | |
386 | } | |
d9a6f30b AG |
387 | |
388 | return iter_info->report_mask; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Pop from iter_info multi head queue, the marks that were iterated in the | |
393 | * current iteration step. | |
394 | */ | |
395 | static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info) | |
396 | { | |
47d9c7cc | 397 | int type; |
d9a6f30b | 398 | |
47d9c7cc AG |
399 | fsnotify_foreach_obj_type(type) { |
400 | if (fsnotify_iter_should_report_type(iter_info, type)) | |
401 | iter_info->marks[type] = | |
402 | fsnotify_next_mark(iter_info->marks[type]); | |
403 | } | |
d9a6f30b AG |
404 | } |
405 | ||
90586523 | 406 | /* |
40a100d3 AG |
407 | * fsnotify - This is the main call to fsnotify. |
408 | * | |
409 | * The VFS calls into hook specific functions in linux/fsnotify.h. | |
410 | * Those functions then in turn call here. Here will call out to all of the | |
411 | * registered fsnotify_group. Those groups can then use the notification event | |
412 | * in whatever means they feel necessary. | |
413 | * | |
414 | * @mask: event type and flags | |
415 | * @data: object that event happened on | |
416 | * @data_type: type of object for fanotify_data_XXX() accessors | |
417 | * @dir: optional directory associated with event - | |
418 | * if @file_name is not NULL, this is the directory that | |
419 | * @file_name is relative to | |
420 | * @file_name: optional file name associated with event | |
421 | * @inode: optional inode associated with event - | |
422 | * either @dir or @inode must be non-NULL. | |
423 | * if both are non-NULL event may be reported to both. | |
424 | * @cookie: inotify rename cookie | |
90586523 | 425 | */ |
40a100d3 AG |
426 | int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir, |
427 | const struct qstr *file_name, struct inode *inode, u32 cookie) | |
90586523 | 428 | { |
b54cecf5 | 429 | const struct path *path = fsnotify_data_path(data, data_type); |
3427ce71 | 430 | struct fsnotify_iter_info iter_info = {}; |
40a100d3 | 431 | struct super_block *sb; |
60f7ed8c | 432 | struct mount *mnt = NULL; |
497b0c5a | 433 | struct inode *child = NULL; |
9385a84d | 434 | int ret = 0; |
71d73410 | 435 | __u32 test_mask, marks_mask; |
90586523 | 436 | |
71d73410 | 437 | if (path) |
aa93bdc5 | 438 | mnt = real_mount(path->mnt); |
613a807f | 439 | |
40a100d3 AG |
440 | if (!inode) { |
441 | /* Dirent event - report on TYPE_INODE to dir */ | |
442 | inode = dir; | |
443 | } else if (mask & FS_EVENT_ON_CHILD) { | |
444 | /* | |
9b93f331 AG |
445 | * Event on child - report on TYPE_INODE to dir if it is |
446 | * watching children and on TYPE_CHILD to child. | |
40a100d3 AG |
447 | */ |
448 | child = inode; | |
449 | inode = dir; | |
450 | } | |
451 | sb = inode->i_sb; | |
497b0c5a | 452 | |
7c49b861 DH |
453 | /* |
454 | * Optimization: srcu_read_lock() has a memory barrier which can | |
455 | * be expensive. It protects walking the *_fsnotify_marks lists. | |
456 | * However, if we do not walk the lists, we do not have to do | |
457 | * SRCU because we have no references to any objects and do not | |
458 | * need SRCU to keep them "alive". | |
459 | */ | |
9b93f331 | 460 | if (!sb->s_fsnotify_marks && |
497b0c5a | 461 | (!mnt || !mnt->mnt_fsnotify_marks) && |
9b93f331 | 462 | (!inode || !inode->i_fsnotify_marks) && |
497b0c5a | 463 | (!child || !child->i_fsnotify_marks)) |
7c49b861 | 464 | return 0; |
71d73410 | 465 | |
9b93f331 | 466 | marks_mask = sb->s_fsnotify_mask; |
497b0c5a AG |
467 | if (mnt) |
468 | marks_mask |= mnt->mnt_fsnotify_mask; | |
9b93f331 AG |
469 | if (inode) |
470 | marks_mask |= inode->i_fsnotify_mask; | |
497b0c5a AG |
471 | if (child) |
472 | marks_mask |= child->i_fsnotify_mask; | |
473 | ||
71d73410 | 474 | |
613a807f EP |
475 | /* |
476 | * if this is a modify event we may need to clear the ignored masks | |
497b0c5a | 477 | * otherwise return if none of the marks care about this type of event. |
613a807f | 478 | */ |
71d73410 MG |
479 | test_mask = (mask & ALL_FSNOTIFY_EVENTS); |
480 | if (!(mask & FS_MODIFY) && !(test_mask & marks_mask)) | |
613a807f | 481 | return 0; |
3a9fb89f | 482 | |
9385a84d | 483 | iter_info.srcu_idx = srcu_read_lock(&fsnotify_mark_srcu); |
7131485a | 484 | |
45a9fb37 AG |
485 | iter_info.marks[FSNOTIFY_OBJ_TYPE_SB] = |
486 | fsnotify_first_mark(&sb->s_fsnotify_marks); | |
9bdda4e9 | 487 | if (mnt) { |
47d9c7cc | 488 | iter_info.marks[FSNOTIFY_OBJ_TYPE_VFSMOUNT] = |
3427ce71 | 489 | fsnotify_first_mark(&mnt->mnt_fsnotify_marks); |
90586523 | 490 | } |
9b93f331 AG |
491 | if (inode) { |
492 | iter_info.marks[FSNOTIFY_OBJ_TYPE_INODE] = | |
493 | fsnotify_first_mark(&inode->i_fsnotify_marks); | |
494 | } | |
497b0c5a AG |
495 | if (child) { |
496 | iter_info.marks[FSNOTIFY_OBJ_TYPE_CHILD] = | |
497 | fsnotify_first_mark(&child->i_fsnotify_marks); | |
498 | } | |
75c1be48 | 499 | |
8edc6e16 | 500 | /* |
60f7ed8c AG |
501 | * We need to merge inode/vfsmount/sb mark lists so that e.g. inode mark |
502 | * ignore masks are properly reflected for mount/sb mark notifications. | |
8edc6e16 JK |
503 | * That's why this traversal is so complicated... |
504 | */ | |
d9a6f30b | 505 | while (fsnotify_iter_select_report_types(&iter_info)) { |
b54cecf5 AG |
506 | ret = send_to_group(mask, data, data_type, dir, file_name, |
507 | cookie, &iter_info); | |
613a807f | 508 | |
ff8bcbd0 EP |
509 | if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS)) |
510 | goto out; | |
511 | ||
d9a6f30b | 512 | fsnotify_iter_next(&iter_info); |
7131485a | 513 | } |
ff8bcbd0 EP |
514 | ret = 0; |
515 | out: | |
9385a84d | 516 | srcu_read_unlock(&fsnotify_mark_srcu, iter_info.srcu_idx); |
c4ec54b4 | 517 | |
98b5c10d | 518 | return ret; |
90586523 EP |
519 | } |
520 | EXPORT_SYMBOL_GPL(fsnotify); | |
521 | ||
522 | static __init int fsnotify_init(void) | |
523 | { | |
75c1be48 EP |
524 | int ret; |
525 | ||
08b95c33 | 526 | BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25); |
20dee624 | 527 | |
75c1be48 EP |
528 | ret = init_srcu_struct(&fsnotify_mark_srcu); |
529 | if (ret) | |
530 | panic("initializing fsnotify_mark_srcu"); | |
531 | ||
9dd813c1 JK |
532 | fsnotify_mark_connector_cachep = KMEM_CACHE(fsnotify_mark_connector, |
533 | SLAB_PANIC); | |
534 | ||
75c1be48 | 535 | return 0; |
90586523 | 536 | } |
75c1be48 | 537 | core_initcall(fsnotify_init); |