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>
17 #include <linux/stringhash.h>
21 static bool fanotify_path_equal(struct path *p1, struct path *p2)
23 return p1->mnt == p2->mnt && p1->dentry == p2->dentry;
26 static unsigned int fanotify_hash_path(const struct path *path)
28 return hash_ptr(path->dentry, FANOTIFY_EVENT_HASH_BITS) ^
29 hash_ptr(path->mnt, FANOTIFY_EVENT_HASH_BITS);
32 static inline bool fanotify_fsid_equal(__kernel_fsid_t *fsid1,
33 __kernel_fsid_t *fsid2)
35 return fsid1->val[0] == fsid2->val[0] && fsid1->val[1] == fsid2->val[1];
38 static unsigned int fanotify_hash_fsid(__kernel_fsid_t *fsid)
40 return hash_32(fsid->val[0], FANOTIFY_EVENT_HASH_BITS) ^
41 hash_32(fsid->val[1], FANOTIFY_EVENT_HASH_BITS);
44 static bool fanotify_fh_equal(struct fanotify_fh *fh1,
45 struct fanotify_fh *fh2)
47 if (fh1->type != fh2->type || fh1->len != fh2->len)
51 !memcmp(fanotify_fh_buf(fh1), fanotify_fh_buf(fh2), fh1->len);
54 static unsigned int fanotify_hash_fh(struct fanotify_fh *fh)
56 long salt = (long)fh->type | (long)fh->len << 8;
59 * full_name_hash() works long by long, so it handles fh buf optimally.
61 return full_name_hash((void *)salt, fanotify_fh_buf(fh), fh->len);
64 static bool fanotify_fid_event_equal(struct fanotify_fid_event *ffe1,
65 struct fanotify_fid_event *ffe2)
67 /* Do not merge fid events without object fh */
68 if (!ffe1->object_fh.len)
71 return fanotify_fsid_equal(&ffe1->fsid, &ffe2->fsid) &&
72 fanotify_fh_equal(&ffe1->object_fh, &ffe2->object_fh);
75 static bool fanotify_info_equal(struct fanotify_info *info1,
76 struct fanotify_info *info2)
78 if (info1->dir_fh_totlen != info2->dir_fh_totlen ||
79 info1->file_fh_totlen != info2->file_fh_totlen ||
80 info1->name_len != info2->name_len)
83 if (info1->dir_fh_totlen &&
84 !fanotify_fh_equal(fanotify_info_dir_fh(info1),
85 fanotify_info_dir_fh(info2)))
88 if (info1->file_fh_totlen &&
89 !fanotify_fh_equal(fanotify_info_file_fh(info1),
90 fanotify_info_file_fh(info2)))
93 return !info1->name_len ||
94 !memcmp(fanotify_info_name(info1), fanotify_info_name(info2),
98 static bool fanotify_name_event_equal(struct fanotify_name_event *fne1,
99 struct fanotify_name_event *fne2)
101 struct fanotify_info *info1 = &fne1->info;
102 struct fanotify_info *info2 = &fne2->info;
104 /* Do not merge name events without dir fh */
105 if (!info1->dir_fh_totlen)
108 if (!fanotify_fsid_equal(&fne1->fsid, &fne2->fsid))
111 return fanotify_info_equal(info1, info2);
114 static bool fanotify_should_merge(struct fanotify_event *old,
115 struct fanotify_event *new)
117 pr_debug("%s: old=%p new=%p\n", __func__, old, new);
119 if (old->hash != new->hash ||
120 old->type != new->type || old->pid != new->pid)
124 * We want to merge many dirent events in the same dir (i.e.
125 * creates/unlinks/renames), but we do not want to merge dirent
126 * events referring to subdirs with dirent events referring to
127 * non subdirs, otherwise, user won't be able to tell from a
128 * mask FAN_CREATE|FAN_DELETE|FAN_ONDIR if it describes mkdir+
129 * unlink pair or rmdir+create pair of events.
131 if ((old->mask & FS_ISDIR) != (new->mask & FS_ISDIR))
135 case FANOTIFY_EVENT_TYPE_PATH:
136 return fanotify_path_equal(fanotify_event_path(old),
137 fanotify_event_path(new));
138 case FANOTIFY_EVENT_TYPE_FID:
139 return fanotify_fid_event_equal(FANOTIFY_FE(old),
141 case FANOTIFY_EVENT_TYPE_FID_NAME:
142 return fanotify_name_event_equal(FANOTIFY_NE(old),
151 /* and the list better be locked by something too! */
152 static int fanotify_merge(struct list_head *list, struct fsnotify_event *event)
154 struct fsnotify_event *test_event;
155 struct fanotify_event *old, *new = FANOTIFY_E(event);
157 pr_debug("%s: list=%p event=%p\n", __func__, list, event);
160 * Don't merge a permission event with any other event so that we know
161 * the event structure we have created in fanotify_handle_event() is the
162 * one we should check for permission response.
164 if (fanotify_is_perm_event(new->mask))
167 list_for_each_entry_reverse(test_event, list, list) {
168 old = FANOTIFY_E(test_event);
169 if (fanotify_should_merge(old, new)) {
170 old->mask |= new->mask;
179 * Wait for response to permission event. The function also takes care of
180 * freeing the permission event (or offloads that in case the wait is canceled
181 * by a signal). The function returns 0 in case access got allowed by userspace,
182 * -EPERM in case userspace disallowed the access, and -ERESTARTSYS in case
183 * the wait got interrupted by a signal.
185 static int fanotify_get_response(struct fsnotify_group *group,
186 struct fanotify_perm_event *event,
187 struct fsnotify_iter_info *iter_info)
191 pr_debug("%s: group=%p event=%p\n", __func__, group, event);
193 ret = wait_event_killable(group->fanotify_data.access_waitq,
194 event->state == FAN_EVENT_ANSWERED);
195 /* Signal pending? */
197 spin_lock(&group->notification_lock);
198 /* Event reported to userspace and no answer yet? */
199 if (event->state == FAN_EVENT_REPORTED) {
200 /* Event will get freed once userspace answers to it */
201 event->state = FAN_EVENT_CANCELED;
202 spin_unlock(&group->notification_lock);
205 /* Event not yet reported? Just remove it. */
206 if (event->state == FAN_EVENT_INIT)
207 fsnotify_remove_queued_event(group, &event->fae.fse);
209 * Event may be also answered in case signal delivery raced
210 * with wakeup. In that case we have nothing to do besides
211 * freeing the event and reporting error.
213 spin_unlock(&group->notification_lock);
217 /* userspace responded, convert to something usable */
218 switch (event->response & ~FAN_AUDIT) {
227 /* Check if the response should be audited */
228 if (event->response & FAN_AUDIT)
229 audit_fanotify(event->response & ~FAN_AUDIT);
231 pr_debug("%s: group=%p event=%p about to return ret=%d\n", __func__,
234 fsnotify_destroy_event(group, &event->fae.fse);
240 * This function returns a mask for an event that only contains the flags
241 * that have been specifically requested by the user. Flags that may have
242 * been included within the event mask, but have not been explicitly
243 * requested by the user, will not be present in the returned mask.
245 static u32 fanotify_group_event_mask(struct fsnotify_group *group,
246 struct fsnotify_iter_info *iter_info,
247 u32 event_mask, const void *data,
248 int data_type, struct inode *dir)
250 __u32 marks_mask = 0, marks_ignored_mask = 0;
251 __u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS |
252 FANOTIFY_EVENT_FLAGS;
253 const struct path *path = fsnotify_data_path(data, data_type);
254 unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
255 struct fsnotify_mark *mark;
258 pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n",
259 __func__, iter_info->report_mask, event_mask, data, data_type);
262 /* Do we have path to open a file descriptor? */
265 /* Path type events are only relevant for files and dirs */
266 if (!d_is_reg(path->dentry) && !d_can_lookup(path->dentry))
268 } else if (!(fid_mode & FAN_REPORT_FID)) {
269 /* Do we have a directory inode to report? */
270 if (!dir && !(event_mask & FS_ISDIR))
274 fsnotify_foreach_obj_type(type) {
275 if (!fsnotify_iter_should_report_type(iter_info, type))
277 mark = iter_info->marks[type];
279 /* Apply ignore mask regardless of ISDIR and ON_CHILD flags */
280 marks_ignored_mask |= mark->ignored_mask;
283 * If the event is on dir and this mark doesn't care about
284 * events on dir, don't send it!
286 if (event_mask & FS_ISDIR && !(mark->mask & FS_ISDIR))
290 * If the event is on a child and this mark is on a parent not
291 * watching children, don't send it!
293 if (type == FSNOTIFY_OBJ_TYPE_PARENT &&
294 !(mark->mask & FS_EVENT_ON_CHILD))
297 marks_mask |= mark->mask;
300 test_mask = event_mask & marks_mask & ~marks_ignored_mask;
303 * For dirent modification events (create/delete/move) that do not carry
304 * the child entry name information, we report FAN_ONDIR for mkdir/rmdir
305 * so user can differentiate them from creat/unlink.
307 * For backward compatibility and consistency, do not report FAN_ONDIR
308 * to user in legacy fanotify mode (reporting fd) and report FAN_ONDIR
309 * to user in fid mode for all event types.
311 * We never report FAN_EVENT_ON_CHILD to user, but we do pass it in to
312 * fanotify_alloc_event() when group is reporting fid as indication
313 * that event happened on child.
316 /* Do not report event flags without any event */
317 if (!(test_mask & ~FANOTIFY_EVENT_FLAGS))
320 user_mask &= ~FANOTIFY_EVENT_FLAGS;
323 return test_mask & user_mask;
327 * Check size needed to encode fanotify_fh.
329 * Return size of encoded fh without fanotify_fh header.
330 * Return 0 on failure to encode.
332 static int fanotify_encode_fh_len(struct inode *inode)
339 exportfs_encode_inode_fh(inode, NULL, &dwords, NULL);
345 * Encode fanotify_fh.
347 * Return total size of encoded fh including fanotify_fh header.
348 * Return 0 on failure to encode.
350 static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode,
351 unsigned int fh_len, unsigned int *hash,
354 int dwords, type = 0;
355 char *ext_buf = NULL;
359 fh->type = FILEID_ROOT;
366 * !gpf means preallocated variable size fh, but fh_len could
367 * be zero in that case if encoding fh len failed.
370 if (fh_len < 4 || WARN_ON_ONCE(fh_len % 4))
373 /* No external buffer in a variable size allocated fh */
374 if (gfp && fh_len > FANOTIFY_INLINE_FH_LEN) {
375 /* Treat failure to allocate fh as failure to encode fh */
377 ext_buf = kmalloc(fh_len, gfp);
381 *fanotify_fh_ext_buf_ptr(fh) = ext_buf;
383 fh->flags |= FANOTIFY_FH_FLAG_EXT_BUF;
386 dwords = fh_len >> 2;
387 type = exportfs_encode_inode_fh(inode, buf, &dwords, NULL);
389 if (!type || type == FILEID_INVALID || fh_len != dwords << 2)
395 /* Mix fh into event merge key */
396 *hash ^= fanotify_hash_fh(fh);
398 return FANOTIFY_FH_HDR_LEN + fh_len;
401 pr_warn_ratelimited("fanotify: failed to encode fid (type=%d, len=%d, err=%i)\n",
404 *fanotify_fh_ext_buf_ptr(fh) = NULL;
405 /* Report the event without a file identifier on encode error */
406 fh->type = FILEID_INVALID;
412 * The inode to use as identifier when reporting fid depends on the event.
413 * Report the modified directory inode on dirent modification events.
414 * Report the "victim" inode otherwise.
416 * FS_ATTRIB reports the child inode even if reported on a watched parent.
417 * FS_CREATE reports the modified dir inode and not the created inode.
419 static struct inode *fanotify_fid_inode(u32 event_mask, const void *data,
420 int data_type, struct inode *dir)
422 if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
425 return fsnotify_data_inode(data, data_type);
429 * The inode to use as identifier when reporting dir fid depends on the event.
430 * Report the modified directory inode on dirent modification events.
431 * Report the "victim" inode if "victim" is a directory.
432 * Report the parent inode if "victim" is not a directory and event is
433 * reported to parent.
434 * Otherwise, do not report dir fid.
436 static struct inode *fanotify_dfid_inode(u32 event_mask, const void *data,
437 int data_type, struct inode *dir)
439 struct inode *inode = fsnotify_data_inode(data, data_type);
441 if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
444 if (S_ISDIR(inode->i_mode))
450 static struct fanotify_event *fanotify_alloc_path_event(const struct path *path,
454 struct fanotify_path_event *pevent;
456 pevent = kmem_cache_alloc(fanotify_path_event_cachep, gfp);
460 pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH;
461 pevent->path = *path;
462 *hash ^= fanotify_hash_path(path);
468 static struct fanotify_event *fanotify_alloc_perm_event(const struct path *path,
471 struct fanotify_perm_event *pevent;
473 pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
477 pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH_PERM;
478 pevent->response = 0;
479 pevent->state = FAN_EVENT_INIT;
480 pevent->path = *path;
486 static struct fanotify_event *fanotify_alloc_fid_event(struct inode *id,
487 __kernel_fsid_t *fsid,
491 struct fanotify_fid_event *ffe;
493 ffe = kmem_cache_alloc(fanotify_fid_event_cachep, gfp);
497 ffe->fae.type = FANOTIFY_EVENT_TYPE_FID;
499 *hash ^= fanotify_hash_fsid(fsid);
500 fanotify_encode_fh(&ffe->object_fh, id, fanotify_encode_fh_len(id),
506 static struct fanotify_event *fanotify_alloc_name_event(struct inode *id,
507 __kernel_fsid_t *fsid,
508 const struct qstr *name,
513 struct fanotify_name_event *fne;
514 struct fanotify_info *info;
515 struct fanotify_fh *dfh, *ffh;
516 unsigned int dir_fh_len = fanotify_encode_fh_len(id);
517 unsigned int child_fh_len = fanotify_encode_fh_len(child);
520 size = sizeof(*fne) + FANOTIFY_FH_HDR_LEN + dir_fh_len;
522 size += FANOTIFY_FH_HDR_LEN + child_fh_len;
524 size += name->len + 1;
525 fne = kmalloc(size, gfp);
529 fne->fae.type = FANOTIFY_EVENT_TYPE_FID_NAME;
531 *hash ^= fanotify_hash_fsid(fsid);
533 fanotify_info_init(info);
534 dfh = fanotify_info_dir_fh(info);
535 info->dir_fh_totlen = fanotify_encode_fh(dfh, id, dir_fh_len, hash, 0);
537 ffh = fanotify_info_file_fh(info);
538 info->file_fh_totlen = fanotify_encode_fh(ffh, child,
539 child_fh_len, hash, 0);
542 long salt = name->len;
544 fanotify_info_copy_name(info, name);
545 *hash ^= full_name_hash((void *)salt, name->name, name->len);
548 pr_debug("%s: ino=%lu size=%u dir_fh_len=%u child_fh_len=%u name_len=%u name='%.*s'\n",
549 __func__, id->i_ino, size, dir_fh_len, child_fh_len,
550 info->name_len, info->name_len, fanotify_info_name(info));
555 static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
556 u32 mask, const void *data,
557 int data_type, struct inode *dir,
558 const struct qstr *file_name,
559 __kernel_fsid_t *fsid)
561 struct fanotify_event *event = NULL;
562 gfp_t gfp = GFP_KERNEL_ACCOUNT;
563 struct inode *id = fanotify_fid_inode(mask, data, data_type, dir);
564 struct inode *dirid = fanotify_dfid_inode(mask, data, data_type, dir);
565 const struct path *path = fsnotify_data_path(data, data_type);
566 unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
567 struct mem_cgroup *old_memcg;
568 struct inode *child = NULL;
569 bool name_event = false;
570 unsigned int hash = 0;
571 bool ondir = mask & FAN_ONDIR;
574 if ((fid_mode & FAN_REPORT_DIR_FID) && dirid) {
576 * With both flags FAN_REPORT_DIR_FID and FAN_REPORT_FID, we
577 * report the child fid for events reported on a non-dir child
578 * in addition to reporting the parent fid and maybe child name.
580 if ((fid_mode & FAN_REPORT_FID) && id != dirid && !ondir)
586 * We record file name only in a group with FAN_REPORT_NAME
587 * and when we have a directory inode to report.
589 * For directory entry modification event, we record the fid of
590 * the directory and the name of the modified entry.
592 * For event on non-directory that is reported to parent, we
593 * record the fid of the parent and the name of the child.
595 * Even if not reporting name, we need a variable length
596 * fanotify_name_event if reporting both parent and child fids.
598 if (!(fid_mode & FAN_REPORT_NAME)) {
599 name_event = !!child;
601 } else if ((mask & ALL_FSNOTIFY_DIRENT_EVENTS) || !ondir) {
607 * For queues with unlimited length lost events are not expected and
608 * can possibly have security implications. Avoid losing events when
609 * memory is short. For the limited size queues, avoid OOM killer in the
610 * target monitoring memcg as it may have security repercussion.
612 if (group->max_events == UINT_MAX)
615 gfp |= __GFP_RETRY_MAYFAIL;
617 /* Whoever is interested in the event, pays for the allocation. */
618 old_memcg = set_active_memcg(group->memcg);
620 if (fanotify_is_perm_event(mask)) {
621 event = fanotify_alloc_perm_event(path, gfp);
622 } else if (name_event && (file_name || child)) {
623 event = fanotify_alloc_name_event(id, fsid, file_name, child,
625 } else if (fid_mode) {
626 event = fanotify_alloc_fid_event(id, fsid, &hash, gfp);
628 event = fanotify_alloc_path_event(path, &hash, gfp);
634 if (FAN_GROUP_FLAG(group, FAN_REPORT_TID))
635 pid = get_pid(task_pid(current));
637 pid = get_pid(task_tgid(current));
639 /* Mix event info, FAN_ONDIR flag and pid into event merge key */
640 hash ^= hash_long((unsigned long)pid | ondir, FANOTIFY_EVENT_HASH_BITS);
641 fanotify_init_event(event, hash, mask);
645 set_active_memcg(old_memcg);
650 * Get cached fsid of the filesystem containing the object from any connector.
651 * All connectors are supposed to have the same fsid, but we do not verify that
654 static __kernel_fsid_t fanotify_get_fsid(struct fsnotify_iter_info *iter_info)
657 __kernel_fsid_t fsid = {};
659 fsnotify_foreach_obj_type(type) {
660 struct fsnotify_mark_connector *conn;
662 if (!fsnotify_iter_should_report_type(iter_info, type))
665 conn = READ_ONCE(iter_info->marks[type]->connector);
666 /* Mark is just getting destroyed or created? */
669 if (!(conn->flags & FSNOTIFY_CONN_FLAG_HAS_FSID))
671 /* Pairs with smp_wmb() in fsnotify_add_mark_list() */
674 if (WARN_ON_ONCE(!fsid.val[0] && !fsid.val[1]))
682 static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
683 const void *data, int data_type,
685 const struct qstr *file_name, u32 cookie,
686 struct fsnotify_iter_info *iter_info)
689 struct fanotify_event *event;
690 struct fsnotify_event *fsn_event;
691 __kernel_fsid_t fsid = {};
693 BUILD_BUG_ON(FAN_ACCESS != FS_ACCESS);
694 BUILD_BUG_ON(FAN_MODIFY != FS_MODIFY);
695 BUILD_BUG_ON(FAN_ATTRIB != FS_ATTRIB);
696 BUILD_BUG_ON(FAN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE);
697 BUILD_BUG_ON(FAN_CLOSE_WRITE != FS_CLOSE_WRITE);
698 BUILD_BUG_ON(FAN_OPEN != FS_OPEN);
699 BUILD_BUG_ON(FAN_MOVED_TO != FS_MOVED_TO);
700 BUILD_BUG_ON(FAN_MOVED_FROM != FS_MOVED_FROM);
701 BUILD_BUG_ON(FAN_CREATE != FS_CREATE);
702 BUILD_BUG_ON(FAN_DELETE != FS_DELETE);
703 BUILD_BUG_ON(FAN_DELETE_SELF != FS_DELETE_SELF);
704 BUILD_BUG_ON(FAN_MOVE_SELF != FS_MOVE_SELF);
705 BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD);
706 BUILD_BUG_ON(FAN_Q_OVERFLOW != FS_Q_OVERFLOW);
707 BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
708 BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
709 BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
710 BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
711 BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
713 BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
715 mask = fanotify_group_event_mask(group, iter_info, mask, data,
720 pr_debug("%s: group=%p mask=%x\n", __func__, group, mask);
722 if (fanotify_is_perm_event(mask)) {
724 * fsnotify_prepare_user_wait() fails if we race with mark
725 * deletion. Just let the operation pass in that case.
727 if (!fsnotify_prepare_user_wait(iter_info))
731 if (FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS)) {
732 fsid = fanotify_get_fsid(iter_info);
733 /* Racing with mark destruction or creation? */
734 if (!fsid.val[0] && !fsid.val[1])
738 event = fanotify_alloc_event(group, mask, data, data_type, dir,
741 if (unlikely(!event)) {
743 * We don't queue overflow events for permission events as
744 * there the access is denied and so no event is in fact lost.
746 if (!fanotify_is_perm_event(mask))
747 fsnotify_queue_overflow(group);
751 fsn_event = &event->fse;
752 ret = fsnotify_add_event(group, fsn_event, fanotify_merge);
754 /* Permission events shouldn't be merged */
755 BUG_ON(ret == 1 && mask & FANOTIFY_PERM_EVENTS);
756 /* Our event wasn't used in the end. Free it. */
757 fsnotify_destroy_event(group, fsn_event);
760 } else if (fanotify_is_perm_event(mask)) {
761 ret = fanotify_get_response(group, FANOTIFY_PERM(event),
765 if (fanotify_is_perm_event(mask))
766 fsnotify_finish_user_wait(iter_info);
771 static void fanotify_free_group_priv(struct fsnotify_group *group)
773 struct user_struct *user;
775 user = group->fanotify_data.user;
776 atomic_dec(&user->fanotify_listeners);
780 static void fanotify_free_path_event(struct fanotify_event *event)
782 path_put(fanotify_event_path(event));
783 kmem_cache_free(fanotify_path_event_cachep, FANOTIFY_PE(event));
786 static void fanotify_free_perm_event(struct fanotify_event *event)
788 path_put(fanotify_event_path(event));
789 kmem_cache_free(fanotify_perm_event_cachep, FANOTIFY_PERM(event));
792 static void fanotify_free_fid_event(struct fanotify_event *event)
794 struct fanotify_fid_event *ffe = FANOTIFY_FE(event);
796 if (fanotify_fh_has_ext_buf(&ffe->object_fh))
797 kfree(fanotify_fh_ext_buf(&ffe->object_fh));
798 kmem_cache_free(fanotify_fid_event_cachep, ffe);
801 static void fanotify_free_name_event(struct fanotify_event *event)
803 kfree(FANOTIFY_NE(event));
806 static void fanotify_free_event(struct fsnotify_event *fsn_event)
808 struct fanotify_event *event;
810 event = FANOTIFY_E(fsn_event);
812 switch (event->type) {
813 case FANOTIFY_EVENT_TYPE_PATH:
814 fanotify_free_path_event(event);
816 case FANOTIFY_EVENT_TYPE_PATH_PERM:
817 fanotify_free_perm_event(event);
819 case FANOTIFY_EVENT_TYPE_FID:
820 fanotify_free_fid_event(event);
822 case FANOTIFY_EVENT_TYPE_FID_NAME:
823 fanotify_free_name_event(event);
825 case FANOTIFY_EVENT_TYPE_OVERFLOW:
833 static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
835 kmem_cache_free(fanotify_mark_cache, fsn_mark);
838 const struct fsnotify_ops fanotify_fsnotify_ops = {
839 .handle_event = fanotify_handle_event,
840 .free_group_priv = fanotify_free_group_priv,
841 .free_event = fanotify_free_event,
842 .free_mark = fanotify_free_mark,