1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fanotify.h>
3 #include <linux/fdtable.h>
4 #include <linux/fsnotify_backend.h>
5 #include <linux/init.h>
6 #include <linux/jiffies.h>
7 #include <linux/kernel.h> /* UINT_MAX */
8 #include <linux/mount.h>
9 #include <linux/sched.h>
10 #include <linux/sched/user.h>
11 #include <linux/sched/signal.h>
12 #include <linux/types.h>
13 #include <linux/wait.h>
14 #include <linux/audit.h>
15 #include <linux/sched/mm.h>
16 #include <linux/statfs.h>
20 static bool fanotify_path_equal(struct path *p1, struct path *p2)
22 return p1->mnt == p2->mnt && p1->dentry == p2->dentry;
25 static inline bool fanotify_fsid_equal(__kernel_fsid_t *fsid1,
26 __kernel_fsid_t *fsid2)
28 return fsid1->val[0] == fsid2->val[0] && fsid1->val[1] == fsid2->val[1];
31 static bool fanotify_fh_equal(struct fanotify_fh *fh1,
32 struct fanotify_fh *fh2)
34 if (fh1->type != fh2->type || fh1->len != fh2->len)
38 !memcmp(fanotify_fh_buf(fh1), fanotify_fh_buf(fh2), fh1->len);
41 static bool fanotify_fid_event_equal(struct fanotify_fid_event *ffe1,
42 struct fanotify_fid_event *ffe2)
44 /* Do not merge fid events without object fh */
45 if (!ffe1->object_fh.len)
48 return fanotify_fsid_equal(&ffe1->fsid, &ffe2->fsid) &&
49 fanotify_fh_equal(&ffe1->object_fh, &ffe2->object_fh);
52 static bool fanotify_info_equal(struct fanotify_info *info1,
53 struct fanotify_info *info2)
55 if (info1->dir_fh_totlen != info2->dir_fh_totlen ||
56 info1->file_fh_totlen != info2->file_fh_totlen ||
57 info1->name_len != info2->name_len)
60 if (info1->dir_fh_totlen &&
61 !fanotify_fh_equal(fanotify_info_dir_fh(info1),
62 fanotify_info_dir_fh(info2)))
65 if (info1->file_fh_totlen &&
66 !fanotify_fh_equal(fanotify_info_file_fh(info1),
67 fanotify_info_file_fh(info2)))
70 return !info1->name_len ||
71 !memcmp(fanotify_info_name(info1), fanotify_info_name(info2),
75 static bool fanotify_name_event_equal(struct fanotify_name_event *fne1,
76 struct fanotify_name_event *fne2)
78 struct fanotify_info *info1 = &fne1->info;
79 struct fanotify_info *info2 = &fne2->info;
81 /* Do not merge name events without dir fh */
82 if (!info1->dir_fh_totlen)
85 if (!fanotify_fsid_equal(&fne1->fsid, &fne2->fsid))
88 return fanotify_info_equal(info1, info2);
91 static bool fanotify_should_merge(struct fsnotify_event *old_fsn,
92 struct fsnotify_event *new_fsn)
94 struct fanotify_event *old, *new;
96 pr_debug("%s: old=%p new=%p\n", __func__, old_fsn, new_fsn);
97 old = FANOTIFY_E(old_fsn);
98 new = FANOTIFY_E(new_fsn);
100 if (old_fsn->objectid != new_fsn->objectid ||
101 old->type != new->type || old->pid != new->pid)
105 * We want to merge many dirent events in the same dir (i.e.
106 * creates/unlinks/renames), but we do not want to merge dirent
107 * events referring to subdirs with dirent events referring to
108 * non subdirs, otherwise, user won't be able to tell from a
109 * mask FAN_CREATE|FAN_DELETE|FAN_ONDIR if it describes mkdir+
110 * unlink pair or rmdir+create pair of events.
112 if ((old->mask & FS_ISDIR) != (new->mask & FS_ISDIR))
116 case FANOTIFY_EVENT_TYPE_PATH:
117 return fanotify_path_equal(fanotify_event_path(old),
118 fanotify_event_path(new));
119 case FANOTIFY_EVENT_TYPE_FID:
120 return fanotify_fid_event_equal(FANOTIFY_FE(old),
122 case FANOTIFY_EVENT_TYPE_FID_NAME:
123 return fanotify_name_event_equal(FANOTIFY_NE(old),
132 /* and the list better be locked by something too! */
133 static int fanotify_merge(struct list_head *list, struct fsnotify_event *event)
135 struct fsnotify_event *test_event;
136 struct fanotify_event *new;
138 pr_debug("%s: list=%p event=%p\n", __func__, list, event);
139 new = FANOTIFY_E(event);
142 * Don't merge a permission event with any other event so that we know
143 * the event structure we have created in fanotify_handle_event() is the
144 * one we should check for permission response.
146 if (fanotify_is_perm_event(new->mask))
149 list_for_each_entry_reverse(test_event, list, list) {
150 if (fanotify_should_merge(test_event, event)) {
151 FANOTIFY_E(test_event)->mask |= new->mask;
160 * Wait for response to permission event. The function also takes care of
161 * freeing the permission event (or offloads that in case the wait is canceled
162 * by a signal). The function returns 0 in case access got allowed by userspace,
163 * -EPERM in case userspace disallowed the access, and -ERESTARTSYS in case
164 * the wait got interrupted by a signal.
166 static int fanotify_get_response(struct fsnotify_group *group,
167 struct fanotify_perm_event *event,
168 struct fsnotify_iter_info *iter_info)
172 pr_debug("%s: group=%p event=%p\n", __func__, group, event);
174 ret = wait_event_killable(group->fanotify_data.access_waitq,
175 event->state == FAN_EVENT_ANSWERED);
176 /* Signal pending? */
178 spin_lock(&group->notification_lock);
179 /* Event reported to userspace and no answer yet? */
180 if (event->state == FAN_EVENT_REPORTED) {
181 /* Event will get freed once userspace answers to it */
182 event->state = FAN_EVENT_CANCELED;
183 spin_unlock(&group->notification_lock);
186 /* Event not yet reported? Just remove it. */
187 if (event->state == FAN_EVENT_INIT)
188 fsnotify_remove_queued_event(group, &event->fae.fse);
190 * Event may be also answered in case signal delivery raced
191 * with wakeup. In that case we have nothing to do besides
192 * freeing the event and reporting error.
194 spin_unlock(&group->notification_lock);
198 /* userspace responded, convert to something usable */
199 switch (event->response & ~FAN_AUDIT) {
208 /* Check if the response should be audited */
209 if (event->response & FAN_AUDIT)
210 audit_fanotify(event->response & ~FAN_AUDIT);
212 pr_debug("%s: group=%p event=%p about to return ret=%d\n", __func__,
215 fsnotify_destroy_event(group, &event->fae.fse);
221 * This function returns a mask for an event that only contains the flags
222 * that have been specifically requested by the user. Flags that may have
223 * been included within the event mask, but have not been explicitly
224 * requested by the user, will not be present in the returned mask.
226 static u32 fanotify_group_event_mask(struct fsnotify_group *group,
227 struct fsnotify_iter_info *iter_info,
228 u32 event_mask, const void *data,
229 int data_type, struct inode *dir)
231 __u32 marks_mask = 0, marks_ignored_mask = 0;
232 __u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS |
233 FANOTIFY_EVENT_FLAGS;
234 const struct path *path = fsnotify_data_path(data, data_type);
235 unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
236 struct fsnotify_mark *mark;
239 pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n",
240 __func__, iter_info->report_mask, event_mask, data, data_type);
243 /* Do we have path to open a file descriptor? */
246 /* Path type events are only relevant for files and dirs */
247 if (!d_is_reg(path->dentry) && !d_can_lookup(path->dentry))
249 } else if (!(fid_mode & FAN_REPORT_FID)) {
250 /* Do we have a directory inode to report? */
251 if (!dir && !(event_mask & FS_ISDIR))
255 fsnotify_foreach_obj_type(type) {
256 if (!fsnotify_iter_should_report_type(iter_info, type))
258 mark = iter_info->marks[type];
260 /* Apply ignore mask regardless of ISDIR and ON_CHILD flags */
261 marks_ignored_mask |= mark->ignored_mask;
264 * If the event is on dir and this mark doesn't care about
265 * events on dir, don't send it!
267 if (event_mask & FS_ISDIR && !(mark->mask & FS_ISDIR))
271 * If the event is on a child and this mark is on a parent not
272 * watching children, don't send it!
274 if (type == FSNOTIFY_OBJ_TYPE_PARENT &&
275 !(mark->mask & FS_EVENT_ON_CHILD))
278 marks_mask |= mark->mask;
281 test_mask = event_mask & marks_mask & ~marks_ignored_mask;
284 * For dirent modification events (create/delete/move) that do not carry
285 * the child entry name information, we report FAN_ONDIR for mkdir/rmdir
286 * so user can differentiate them from creat/unlink.
288 * For backward compatibility and consistency, do not report FAN_ONDIR
289 * to user in legacy fanotify mode (reporting fd) and report FAN_ONDIR
290 * to user in fid mode for all event types.
292 * We never report FAN_EVENT_ON_CHILD to user, but we do pass it in to
293 * fanotify_alloc_event() when group is reporting fid as indication
294 * that event happened on child.
297 /* Do not report event flags without any event */
298 if (!(test_mask & ~FANOTIFY_EVENT_FLAGS))
301 user_mask &= ~FANOTIFY_EVENT_FLAGS;
304 return test_mask & user_mask;
308 * Check size needed to encode fanotify_fh.
310 * Return size of encoded fh without fanotify_fh header.
311 * Return 0 on failure to encode.
313 static int fanotify_encode_fh_len(struct inode *inode)
320 exportfs_encode_inode_fh(inode, NULL, &dwords, NULL);
326 * Encode fanotify_fh.
328 * Return total size of encoded fh including fanotify_fh header.
329 * Return 0 on failure to encode.
331 static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode,
332 unsigned int fh_len, gfp_t gfp)
334 int dwords, type = 0;
335 char *ext_buf = NULL;
339 fh->type = FILEID_ROOT;
346 * !gpf means preallocated variable size fh, but fh_len could
347 * be zero in that case if encoding fh len failed.
350 if (fh_len < 4 || WARN_ON_ONCE(fh_len % 4))
353 /* No external buffer in a variable size allocated fh */
354 if (gfp && fh_len > FANOTIFY_INLINE_FH_LEN) {
355 /* Treat failure to allocate fh as failure to encode fh */
357 ext_buf = kmalloc(fh_len, gfp);
361 *fanotify_fh_ext_buf_ptr(fh) = ext_buf;
363 fh->flags |= FANOTIFY_FH_FLAG_EXT_BUF;
366 dwords = fh_len >> 2;
367 type = exportfs_encode_inode_fh(inode, buf, &dwords, NULL);
369 if (!type || type == FILEID_INVALID || fh_len != dwords << 2)
375 return FANOTIFY_FH_HDR_LEN + fh_len;
378 pr_warn_ratelimited("fanotify: failed to encode fid (type=%d, len=%d, err=%i)\n",
381 *fanotify_fh_ext_buf_ptr(fh) = NULL;
382 /* Report the event without a file identifier on encode error */
383 fh->type = FILEID_INVALID;
389 * The inode to use as identifier when reporting fid depends on the event.
390 * Report the modified directory inode on dirent modification events.
391 * Report the "victim" inode otherwise.
393 * FS_ATTRIB reports the child inode even if reported on a watched parent.
394 * FS_CREATE reports the modified dir inode and not the created inode.
396 static struct inode *fanotify_fid_inode(u32 event_mask, const void *data,
397 int data_type, struct inode *dir)
399 if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
402 return fsnotify_data_inode(data, data_type);
406 * The inode to use as identifier when reporting dir fid depends on the event.
407 * Report the modified directory inode on dirent modification events.
408 * Report the "victim" inode if "victim" is a directory.
409 * Report the parent inode if "victim" is not a directory and event is
410 * reported to parent.
411 * Otherwise, do not report dir fid.
413 static struct inode *fanotify_dfid_inode(u32 event_mask, const void *data,
414 int data_type, struct inode *dir)
416 struct inode *inode = fsnotify_data_inode(data, data_type);
418 if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
421 if (S_ISDIR(inode->i_mode))
427 static struct fanotify_event *fanotify_alloc_path_event(const struct path *path,
430 struct fanotify_path_event *pevent;
432 pevent = kmem_cache_alloc(fanotify_path_event_cachep, gfp);
436 pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH;
437 pevent->path = *path;
443 static struct fanotify_event *fanotify_alloc_perm_event(const struct path *path,
446 struct fanotify_perm_event *pevent;
448 pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
452 pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH_PERM;
453 pevent->response = 0;
454 pevent->state = FAN_EVENT_INIT;
455 pevent->path = *path;
461 static struct fanotify_event *fanotify_alloc_fid_event(struct inode *id,
462 __kernel_fsid_t *fsid,
465 struct fanotify_fid_event *ffe;
467 ffe = kmem_cache_alloc(fanotify_fid_event_cachep, gfp);
471 ffe->fae.type = FANOTIFY_EVENT_TYPE_FID;
473 fanotify_encode_fh(&ffe->object_fh, id, fanotify_encode_fh_len(id),
479 static struct fanotify_event *fanotify_alloc_name_event(struct inode *id,
480 __kernel_fsid_t *fsid,
481 const struct qstr *file_name,
485 struct fanotify_name_event *fne;
486 struct fanotify_info *info;
487 struct fanotify_fh *dfh, *ffh;
488 unsigned int dir_fh_len = fanotify_encode_fh_len(id);
489 unsigned int child_fh_len = fanotify_encode_fh_len(child);
492 size = sizeof(*fne) + FANOTIFY_FH_HDR_LEN + dir_fh_len;
494 size += FANOTIFY_FH_HDR_LEN + child_fh_len;
496 size += file_name->len + 1;
497 fne = kmalloc(size, gfp);
501 fne->fae.type = FANOTIFY_EVENT_TYPE_FID_NAME;
504 fanotify_info_init(info);
505 dfh = fanotify_info_dir_fh(info);
506 info->dir_fh_totlen = fanotify_encode_fh(dfh, id, dir_fh_len, 0);
508 ffh = fanotify_info_file_fh(info);
509 info->file_fh_totlen = fanotify_encode_fh(ffh, child, child_fh_len, 0);
512 fanotify_info_copy_name(info, file_name);
514 pr_debug("%s: ino=%lu size=%u dir_fh_len=%u child_fh_len=%u name_len=%u name='%.*s'\n",
515 __func__, id->i_ino, size, dir_fh_len, child_fh_len,
516 info->name_len, info->name_len, fanotify_info_name(info));
521 static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
522 u32 mask, const void *data,
523 int data_type, struct inode *dir,
524 const struct qstr *file_name,
525 __kernel_fsid_t *fsid)
527 struct fanotify_event *event = NULL;
528 gfp_t gfp = GFP_KERNEL_ACCOUNT;
529 struct inode *id = fanotify_fid_inode(mask, data, data_type, dir);
530 struct inode *dirid = fanotify_dfid_inode(mask, data, data_type, dir);
531 const struct path *path = fsnotify_data_path(data, data_type);
532 unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
533 struct mem_cgroup *old_memcg;
534 struct inode *child = NULL;
535 bool name_event = false;
537 if ((fid_mode & FAN_REPORT_DIR_FID) && dirid) {
539 * With both flags FAN_REPORT_DIR_FID and FAN_REPORT_FID, we
540 * report the child fid for events reported on a non-dir child
541 * in addition to reporting the parent fid and maybe child name.
543 if ((fid_mode & FAN_REPORT_FID) &&
544 id != dirid && !(mask & FAN_ONDIR))
550 * We record file name only in a group with FAN_REPORT_NAME
551 * and when we have a directory inode to report.
553 * For directory entry modification event, we record the fid of
554 * the directory and the name of the modified entry.
556 * For event on non-directory that is reported to parent, we
557 * record the fid of the parent and the name of the child.
559 * Even if not reporting name, we need a variable length
560 * fanotify_name_event if reporting both parent and child fids.
562 if (!(fid_mode & FAN_REPORT_NAME)) {
563 name_event = !!child;
565 } else if ((mask & ALL_FSNOTIFY_DIRENT_EVENTS) ||
566 !(mask & FAN_ONDIR)) {
572 * For queues with unlimited length lost events are not expected and
573 * can possibly have security implications. Avoid losing events when
574 * memory is short. For the limited size queues, avoid OOM killer in the
575 * target monitoring memcg as it may have security repercussion.
577 if (group->max_events == UINT_MAX)
580 gfp |= __GFP_RETRY_MAYFAIL;
582 /* Whoever is interested in the event, pays for the allocation. */
583 old_memcg = set_active_memcg(group->memcg);
585 if (fanotify_is_perm_event(mask)) {
586 event = fanotify_alloc_perm_event(path, gfp);
587 } else if (name_event && (file_name || child)) {
588 event = fanotify_alloc_name_event(id, fsid, file_name, child,
590 } else if (fid_mode) {
591 event = fanotify_alloc_fid_event(id, fsid, gfp);
593 event = fanotify_alloc_path_event(path, gfp);
600 * Use the victim inode instead of the watching inode as the id for
601 * event queue, so event reported on parent is merged with event
602 * reported on child when both directory and child watches exist.
604 fanotify_init_event(event, (unsigned long)id, mask);
605 if (FAN_GROUP_FLAG(group, FAN_REPORT_TID))
606 event->pid = get_pid(task_pid(current));
608 event->pid = get_pid(task_tgid(current));
611 set_active_memcg(old_memcg);
616 * Get cached fsid of the filesystem containing the object from any connector.
617 * All connectors are supposed to have the same fsid, but we do not verify that
620 static __kernel_fsid_t fanotify_get_fsid(struct fsnotify_iter_info *iter_info)
623 __kernel_fsid_t fsid = {};
625 fsnotify_foreach_obj_type(type) {
626 struct fsnotify_mark_connector *conn;
628 if (!fsnotify_iter_should_report_type(iter_info, type))
631 conn = READ_ONCE(iter_info->marks[type]->connector);
632 /* Mark is just getting destroyed or created? */
635 if (!(conn->flags & FSNOTIFY_CONN_FLAG_HAS_FSID))
637 /* Pairs with smp_wmb() in fsnotify_add_mark_list() */
640 if (WARN_ON_ONCE(!fsid.val[0] && !fsid.val[1]))
648 static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
649 const void *data, int data_type,
651 const struct qstr *file_name, u32 cookie,
652 struct fsnotify_iter_info *iter_info)
655 struct fanotify_event *event;
656 struct fsnotify_event *fsn_event;
657 __kernel_fsid_t fsid = {};
659 BUILD_BUG_ON(FAN_ACCESS != FS_ACCESS);
660 BUILD_BUG_ON(FAN_MODIFY != FS_MODIFY);
661 BUILD_BUG_ON(FAN_ATTRIB != FS_ATTRIB);
662 BUILD_BUG_ON(FAN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE);
663 BUILD_BUG_ON(FAN_CLOSE_WRITE != FS_CLOSE_WRITE);
664 BUILD_BUG_ON(FAN_OPEN != FS_OPEN);
665 BUILD_BUG_ON(FAN_MOVED_TO != FS_MOVED_TO);
666 BUILD_BUG_ON(FAN_MOVED_FROM != FS_MOVED_FROM);
667 BUILD_BUG_ON(FAN_CREATE != FS_CREATE);
668 BUILD_BUG_ON(FAN_DELETE != FS_DELETE);
669 BUILD_BUG_ON(FAN_DELETE_SELF != FS_DELETE_SELF);
670 BUILD_BUG_ON(FAN_MOVE_SELF != FS_MOVE_SELF);
671 BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD);
672 BUILD_BUG_ON(FAN_Q_OVERFLOW != FS_Q_OVERFLOW);
673 BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
674 BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
675 BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
676 BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
677 BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
679 BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
681 mask = fanotify_group_event_mask(group, iter_info, mask, data,
686 pr_debug("%s: group=%p mask=%x\n", __func__, group, mask);
688 if (fanotify_is_perm_event(mask)) {
690 * fsnotify_prepare_user_wait() fails if we race with mark
691 * deletion. Just let the operation pass in that case.
693 if (!fsnotify_prepare_user_wait(iter_info))
697 if (FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS)) {
698 fsid = fanotify_get_fsid(iter_info);
699 /* Racing with mark destruction or creation? */
700 if (!fsid.val[0] && !fsid.val[1])
704 event = fanotify_alloc_event(group, mask, data, data_type, dir,
707 if (unlikely(!event)) {
709 * We don't queue overflow events for permission events as
710 * there the access is denied and so no event is in fact lost.
712 if (!fanotify_is_perm_event(mask))
713 fsnotify_queue_overflow(group);
717 fsn_event = &event->fse;
718 ret = fsnotify_add_event(group, fsn_event, fanotify_merge);
720 /* Permission events shouldn't be merged */
721 BUG_ON(ret == 1 && mask & FANOTIFY_PERM_EVENTS);
722 /* Our event wasn't used in the end. Free it. */
723 fsnotify_destroy_event(group, fsn_event);
726 } else if (fanotify_is_perm_event(mask)) {
727 ret = fanotify_get_response(group, FANOTIFY_PERM(event),
731 if (fanotify_is_perm_event(mask))
732 fsnotify_finish_user_wait(iter_info);
737 static void fanotify_free_group_priv(struct fsnotify_group *group)
739 struct user_struct *user;
741 user = group->fanotify_data.user;
742 atomic_dec(&user->fanotify_listeners);
746 static void fanotify_free_path_event(struct fanotify_event *event)
748 path_put(fanotify_event_path(event));
749 kmem_cache_free(fanotify_path_event_cachep, FANOTIFY_PE(event));
752 static void fanotify_free_perm_event(struct fanotify_event *event)
754 path_put(fanotify_event_path(event));
755 kmem_cache_free(fanotify_perm_event_cachep, FANOTIFY_PERM(event));
758 static void fanotify_free_fid_event(struct fanotify_event *event)
760 struct fanotify_fid_event *ffe = FANOTIFY_FE(event);
762 if (fanotify_fh_has_ext_buf(&ffe->object_fh))
763 kfree(fanotify_fh_ext_buf(&ffe->object_fh));
764 kmem_cache_free(fanotify_fid_event_cachep, ffe);
767 static void fanotify_free_name_event(struct fanotify_event *event)
769 kfree(FANOTIFY_NE(event));
772 static void fanotify_free_event(struct fsnotify_event *fsn_event)
774 struct fanotify_event *event;
776 event = FANOTIFY_E(fsn_event);
778 switch (event->type) {
779 case FANOTIFY_EVENT_TYPE_PATH:
780 fanotify_free_path_event(event);
782 case FANOTIFY_EVENT_TYPE_PATH_PERM:
783 fanotify_free_perm_event(event);
785 case FANOTIFY_EVENT_TYPE_FID:
786 fanotify_free_fid_event(event);
788 case FANOTIFY_EVENT_TYPE_FID_NAME:
789 fanotify_free_name_event(event);
791 case FANOTIFY_EVENT_TYPE_OVERFLOW:
799 static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
801 kmem_cache_free(fanotify_mark_cache, fsn_mark);
804 const struct fsnotify_ops fanotify_fsnotify_ops = {
805 .handle_event = fanotify_handle_event,
806 .free_group_priv = fanotify_free_group_priv,
807 .free_event = fanotify_free_event,
808 .free_mark = fanotify_free_mark,