2 * fs/inotify_user.c - inotify support for userspace
5 * John McCutchan <ttb@tentacle.dhs.org>
6 * Robert Love <rml@novell.com>
8 * Copyright (C) 2005 John McCutchan
9 * Copyright 2006 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2009 Eric Paris <Red Hat Inc>
12 * inotify was largely rewriten to make use of the fsnotify infrastructure
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2, or (at your option) any
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
25 #include <linux/file.h>
26 #include <linux/fs.h> /* struct inode */
27 #include <linux/fsnotify_backend.h>
28 #include <linux/idr.h>
29 #include <linux/init.h> /* module_init */
30 #include <linux/inotify.h>
31 #include <linux/kernel.h> /* roundup() */
32 #include <linux/namei.h> /* LOOKUP_FOLLOW */
33 #include <linux/sched.h> /* struct user */
34 #include <linux/slab.h> /* struct kmem_cache */
35 #include <linux/syscalls.h>
36 #include <linux/types.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/uaccess.h>
39 #include <linux/poll.h>
40 #include <linux/wait.h>
44 #include <asm/ioctls.h>
46 /* these are configurable via /proc/sys/fs/inotify/ */
47 static int inotify_max_user_instances __read_mostly
;
48 static int inotify_max_queued_events __read_mostly
;
49 static int inotify_max_user_watches __read_mostly
;
51 static struct kmem_cache
*inotify_inode_mark_cachep __read_mostly
;
52 struct kmem_cache
*event_priv_cachep __read_mostly
;
56 #include <linux/sysctl.h>
60 ctl_table inotify_table
[] = {
62 .procname
= "max_user_instances",
63 .data
= &inotify_max_user_instances
,
64 .maxlen
= sizeof(int),
66 .proc_handler
= proc_dointvec_minmax
,
70 .procname
= "max_user_watches",
71 .data
= &inotify_max_user_watches
,
72 .maxlen
= sizeof(int),
74 .proc_handler
= proc_dointvec_minmax
,
78 .procname
= "max_queued_events",
79 .data
= &inotify_max_queued_events
,
80 .maxlen
= sizeof(int),
82 .proc_handler
= proc_dointvec_minmax
,
87 #endif /* CONFIG_SYSCTL */
89 static inline __u32
inotify_arg_to_mask(u32 arg
)
94 * everything should accept their own ignored, cares about children,
95 * and should receive events when the inode is unmounted
97 mask
= (FS_IN_IGNORED
| FS_EVENT_ON_CHILD
| FS_UNMOUNT
);
99 /* mask off the flags used to open the fd */
100 mask
|= (arg
& (IN_ALL_EVENTS
| IN_ONESHOT
| IN_EXCL_UNLINK
));
105 static inline u32
inotify_mask_to_arg(__u32 mask
)
107 return mask
& (IN_ALL_EVENTS
| IN_ISDIR
| IN_UNMOUNT
| IN_IGNORED
|
111 /* intofiy userspace file descriptor functions */
112 static unsigned int inotify_poll(struct file
*file
, poll_table
*wait
)
114 struct fsnotify_group
*group
= file
->private_data
;
117 poll_wait(file
, &group
->notification_waitq
, wait
);
118 mutex_lock(&group
->notification_mutex
);
119 if (!fsnotify_notify_queue_is_empty(group
))
120 ret
= POLLIN
| POLLRDNORM
;
121 mutex_unlock(&group
->notification_mutex
);
127 * Get an inotify_kernel_event if one exists and is small
128 * enough to fit in "count". Return an error pointer if
131 * Called with the group->notification_mutex held.
133 static struct fsnotify_event
*get_one_event(struct fsnotify_group
*group
,
136 size_t event_size
= sizeof(struct inotify_event
);
137 struct fsnotify_event
*event
;
139 if (fsnotify_notify_queue_is_empty(group
))
142 event
= fsnotify_peek_notify_event(group
);
144 pr_debug("%s: group=%p event=%p\n", __func__
, group
, event
);
147 event_size
+= roundup(event
->name_len
+ 1, event_size
);
149 if (event_size
> count
)
150 return ERR_PTR(-EINVAL
);
152 /* held the notification_mutex the whole time, so this is the
153 * same event we peeked above */
154 fsnotify_remove_notify_event(group
);
160 * Copy an event to user space, returning how much we copied.
162 * We already checked that the event size is smaller than the
163 * buffer we had in "get_one_event()" above.
165 static ssize_t
copy_event_to_user(struct fsnotify_group
*group
,
166 struct fsnotify_event
*event
,
169 struct inotify_event inotify_event
;
170 struct fsnotify_event_private_data
*fsn_priv
;
171 struct inotify_event_private_data
*priv
;
172 size_t event_size
= sizeof(struct inotify_event
);
175 pr_debug("%s: group=%p event=%p\n", __func__
, group
, event
);
177 /* we get the inotify watch descriptor from the event private data */
178 spin_lock(&event
->lock
);
179 fsn_priv
= fsnotify_remove_priv_from_event(group
, event
);
180 spin_unlock(&event
->lock
);
183 inotify_event
.wd
= -1;
185 priv
= container_of(fsn_priv
, struct inotify_event_private_data
,
186 fsnotify_event_priv_data
);
187 inotify_event
.wd
= priv
->wd
;
188 inotify_free_event_priv(fsn_priv
);
192 * round up event->name_len so it is a multiple of event_size
193 * plus an extra byte for the terminating '\0'.
196 name_len
= roundup(event
->name_len
+ 1, event_size
);
197 inotify_event
.len
= name_len
;
199 inotify_event
.mask
= inotify_mask_to_arg(event
->mask
);
200 inotify_event
.cookie
= event
->sync_cookie
;
202 /* send the main event */
203 if (copy_to_user(buf
, &inotify_event
, event_size
))
209 * fsnotify only stores the pathname, so here we have to send the pathname
210 * and then pad that pathname out to a multiple of sizeof(inotify_event)
211 * with zeros. I get my zeros from the nul_inotify_event.
214 unsigned int len_to_zero
= name_len
- event
->name_len
;
215 /* copy the path name */
216 if (copy_to_user(buf
, event
->file_name
, event
->name_len
))
218 buf
+= event
->name_len
;
220 /* fill userspace with 0's */
221 if (clear_user(buf
, len_to_zero
))
224 event_size
+= name_len
;
230 static ssize_t
inotify_read(struct file
*file
, char __user
*buf
,
231 size_t count
, loff_t
*pos
)
233 struct fsnotify_group
*group
;
234 struct fsnotify_event
*kevent
;
240 group
= file
->private_data
;
243 prepare_to_wait(&group
->notification_waitq
, &wait
, TASK_INTERRUPTIBLE
);
245 mutex_lock(&group
->notification_mutex
);
246 kevent
= get_one_event(group
, count
);
247 mutex_unlock(&group
->notification_mutex
);
249 pr_debug("%s: group=%p kevent=%p\n", __func__
, group
, kevent
);
252 ret
= PTR_ERR(kevent
);
255 ret
= copy_event_to_user(group
, kevent
, buf
);
256 fsnotify_put_event(kevent
);
265 if (file
->f_flags
& O_NONBLOCK
)
268 if (signal_pending(current
))
277 finish_wait(&group
->notification_waitq
, &wait
);
278 if (start
!= buf
&& ret
!= -EFAULT
)
283 static int inotify_fasync(int fd
, struct file
*file
, int on
)
285 struct fsnotify_group
*group
= file
->private_data
;
287 return fasync_helper(fd
, file
, on
, &group
->inotify_data
.fa
) >= 0 ? 0 : -EIO
;
290 static int inotify_release(struct inode
*ignored
, struct file
*file
)
292 struct fsnotify_group
*group
= file
->private_data
;
293 struct user_struct
*user
= group
->inotify_data
.user
;
295 pr_debug("%s: group=%p\n", __func__
, group
);
297 fsnotify_clear_marks_by_group(group
);
299 /* free this group, matching get was inotify_init->fsnotify_obtain_group */
300 fsnotify_put_group(group
);
302 atomic_dec(&user
->inotify_devs
);
307 static long inotify_ioctl(struct file
*file
, unsigned int cmd
,
310 struct fsnotify_group
*group
;
311 struct fsnotify_event_holder
*holder
;
312 struct fsnotify_event
*event
;
317 group
= file
->private_data
;
318 p
= (void __user
*) arg
;
320 pr_debug("%s: group=%p cmd=%u\n", __func__
, group
, cmd
);
324 mutex_lock(&group
->notification_mutex
);
325 list_for_each_entry(holder
, &group
->notification_list
, event_list
) {
326 event
= holder
->event
;
327 send_len
+= sizeof(struct inotify_event
);
329 send_len
+= roundup(event
->name_len
+ 1,
330 sizeof(struct inotify_event
));
332 mutex_unlock(&group
->notification_mutex
);
333 ret
= put_user(send_len
, (int __user
*) p
);
340 static const struct file_operations inotify_fops
= {
341 .poll
= inotify_poll
,
342 .read
= inotify_read
,
343 .fasync
= inotify_fasync
,
344 .release
= inotify_release
,
345 .unlocked_ioctl
= inotify_ioctl
,
346 .compat_ioctl
= inotify_ioctl
,
347 .llseek
= noop_llseek
,
352 * find_inode - resolve a user-given path to a specific inode
354 static int inotify_find_inode(const char __user
*dirname
, struct path
*path
, unsigned flags
)
358 error
= user_path_at(AT_FDCWD
, dirname
, flags
, path
);
361 /* you can only watch an inode if you have read permissions on it */
362 error
= inode_permission(path
->dentry
->d_inode
, MAY_READ
);
368 static int inotify_add_to_idr(struct idr
*idr
, spinlock_t
*idr_lock
,
370 struct inotify_inode_mark
*i_mark
)
375 if (unlikely(!idr_pre_get(idr
, GFP_KERNEL
)))
379 ret
= idr_get_new_above(idr
, i_mark
, *last_wd
+ 1,
381 /* we added the mark to the idr, take a reference */
383 *last_wd
= i_mark
->wd
;
384 fsnotify_get_mark(&i_mark
->fsn_mark
);
386 spin_unlock(idr_lock
);
387 } while (ret
== -EAGAIN
);
392 static struct inotify_inode_mark
*inotify_idr_find_locked(struct fsnotify_group
*group
,
395 struct idr
*idr
= &group
->inotify_data
.idr
;
396 spinlock_t
*idr_lock
= &group
->inotify_data
.idr_lock
;
397 struct inotify_inode_mark
*i_mark
;
399 assert_spin_locked(idr_lock
);
401 i_mark
= idr_find(idr
, wd
);
403 struct fsnotify_mark
*fsn_mark
= &i_mark
->fsn_mark
;
405 fsnotify_get_mark(fsn_mark
);
406 /* One ref for being in the idr, one ref we just took */
407 BUG_ON(atomic_read(&fsn_mark
->refcnt
) < 2);
413 static struct inotify_inode_mark
*inotify_idr_find(struct fsnotify_group
*group
,
416 struct inotify_inode_mark
*i_mark
;
417 spinlock_t
*idr_lock
= &group
->inotify_data
.idr_lock
;
420 i_mark
= inotify_idr_find_locked(group
, wd
);
421 spin_unlock(idr_lock
);
426 static void do_inotify_remove_from_idr(struct fsnotify_group
*group
,
427 struct inotify_inode_mark
*i_mark
)
429 struct idr
*idr
= &group
->inotify_data
.idr
;
430 spinlock_t
*idr_lock
= &group
->inotify_data
.idr_lock
;
433 assert_spin_locked(idr_lock
);
437 /* removed from the idr, drop that ref */
438 fsnotify_put_mark(&i_mark
->fsn_mark
);
442 * Remove the mark from the idr (if present) and drop the reference
443 * on the mark because it was in the idr.
445 static void inotify_remove_from_idr(struct fsnotify_group
*group
,
446 struct inotify_inode_mark
*i_mark
)
448 spinlock_t
*idr_lock
= &group
->inotify_data
.idr_lock
;
449 struct inotify_inode_mark
*found_i_mark
= NULL
;
456 * does this i_mark think it is in the idr? we shouldn't get called
460 WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p"
461 " i_mark->inode=%p\n", __func__
, i_mark
, i_mark
->wd
,
462 i_mark
->fsn_mark
.group
, i_mark
->fsn_mark
.i
.inode
);
466 /* Lets look in the idr to see if we find it */
467 found_i_mark
= inotify_idr_find_locked(group
, wd
);
468 if (unlikely(!found_i_mark
)) {
469 WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p"
470 " i_mark->inode=%p\n", __func__
, i_mark
, i_mark
->wd
,
471 i_mark
->fsn_mark
.group
, i_mark
->fsn_mark
.i
.inode
);
476 * We found an mark in the idr at the right wd, but it's
477 * not the mark we were told to remove. eparis seriously
478 * fucked up somewhere.
480 if (unlikely(found_i_mark
!= i_mark
)) {
481 WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p "
482 "mark->inode=%p found_i_mark=%p found_i_mark->wd=%d "
483 "found_i_mark->group=%p found_i_mark->inode=%p\n",
484 __func__
, i_mark
, i_mark
->wd
, i_mark
->fsn_mark
.group
,
485 i_mark
->fsn_mark
.i
.inode
, found_i_mark
, found_i_mark
->wd
,
486 found_i_mark
->fsn_mark
.group
,
487 found_i_mark
->fsn_mark
.i
.inode
);
492 * One ref for being in the idr
493 * one ref held by the caller trying to kill us
494 * one ref grabbed by inotify_idr_find
496 if (unlikely(atomic_read(&i_mark
->fsn_mark
.refcnt
) < 3)) {
497 printk(KERN_ERR
"%s: i_mark=%p i_mark->wd=%d i_mark->group=%p"
498 " i_mark->inode=%p\n", __func__
, i_mark
, i_mark
->wd
,
499 i_mark
->fsn_mark
.group
, i_mark
->fsn_mark
.i
.inode
);
500 /* we can't really recover with bad ref cnting.. */
504 do_inotify_remove_from_idr(group
, i_mark
);
506 /* match the ref taken by inotify_idr_find_locked() */
508 fsnotify_put_mark(&found_i_mark
->fsn_mark
);
510 spin_unlock(idr_lock
);
514 * Send IN_IGNORED for this wd, remove this wd from the idr.
516 void inotify_ignored_and_remove_idr(struct fsnotify_mark
*fsn_mark
,
517 struct fsnotify_group
*group
)
519 struct inotify_inode_mark
*i_mark
;
520 struct fsnotify_event
*ignored_event
, *notify_event
;
521 struct inotify_event_private_data
*event_priv
;
522 struct fsnotify_event_private_data
*fsn_event_priv
;
525 ignored_event
= fsnotify_create_event(NULL
, FS_IN_IGNORED
, NULL
,
526 FSNOTIFY_EVENT_NONE
, NULL
, 0,
531 i_mark
= container_of(fsn_mark
, struct inotify_inode_mark
, fsn_mark
);
533 event_priv
= kmem_cache_alloc(event_priv_cachep
, GFP_NOFS
);
534 if (unlikely(!event_priv
))
535 goto skip_send_ignore
;
537 fsn_event_priv
= &event_priv
->fsnotify_event_priv_data
;
539 fsn_event_priv
->group
= group
;
540 event_priv
->wd
= i_mark
->wd
;
542 notify_event
= fsnotify_add_notify_event(group
, ignored_event
, fsn_event_priv
, NULL
);
544 if (IS_ERR(notify_event
))
545 ret
= PTR_ERR(notify_event
);
547 fsnotify_put_event(notify_event
);
548 inotify_free_event_priv(fsn_event_priv
);
553 /* matches the reference taken when the event was created */
554 fsnotify_put_event(ignored_event
);
556 /* remove this mark from the idr */
557 inotify_remove_from_idr(group
, i_mark
);
559 atomic_dec(&group
->inotify_data
.user
->inotify_watches
);
562 /* ding dong the mark is dead */
563 static void inotify_free_mark(struct fsnotify_mark
*fsn_mark
)
565 struct inotify_inode_mark
*i_mark
;
567 i_mark
= container_of(fsn_mark
, struct inotify_inode_mark
, fsn_mark
);
569 kmem_cache_free(inotify_inode_mark_cachep
, i_mark
);
572 static int inotify_update_existing_watch(struct fsnotify_group
*group
,
576 struct fsnotify_mark
*fsn_mark
;
577 struct inotify_inode_mark
*i_mark
;
578 __u32 old_mask
, new_mask
;
580 int add
= (arg
& IN_MASK_ADD
);
583 /* don't allow invalid bits: we don't want flags set */
584 mask
= inotify_arg_to_mask(arg
);
585 if (unlikely(!(mask
& IN_ALL_EVENTS
)))
588 fsn_mark
= fsnotify_find_inode_mark(group
, inode
);
592 i_mark
= container_of(fsn_mark
, struct inotify_inode_mark
, fsn_mark
);
594 spin_lock(&fsn_mark
->lock
);
596 old_mask
= fsn_mark
->mask
;
598 fsnotify_set_mark_mask_locked(fsn_mark
, (fsn_mark
->mask
| mask
));
600 fsnotify_set_mark_mask_locked(fsn_mark
, mask
);
601 new_mask
= fsn_mark
->mask
;
603 spin_unlock(&fsn_mark
->lock
);
605 if (old_mask
!= new_mask
) {
606 /* more bits in old than in new? */
607 int dropped
= (old_mask
& ~new_mask
);
608 /* more bits in this fsn_mark than the inode's mask? */
609 int do_inode
= (new_mask
& ~inode
->i_fsnotify_mask
);
611 /* update the inode with this new fsn_mark */
612 if (dropped
|| do_inode
)
613 fsnotify_recalc_inode_mask(inode
);
620 /* match the get from fsnotify_find_mark() */
621 fsnotify_put_mark(fsn_mark
);
626 static int inotify_new_watch(struct fsnotify_group
*group
,
630 struct inotify_inode_mark
*tmp_i_mark
;
633 struct idr
*idr
= &group
->inotify_data
.idr
;
634 spinlock_t
*idr_lock
= &group
->inotify_data
.idr_lock
;
636 /* don't allow invalid bits: we don't want flags set */
637 mask
= inotify_arg_to_mask(arg
);
638 if (unlikely(!(mask
& IN_ALL_EVENTS
)))
641 tmp_i_mark
= kmem_cache_alloc(inotify_inode_mark_cachep
, GFP_KERNEL
);
642 if (unlikely(!tmp_i_mark
))
645 fsnotify_init_mark(&tmp_i_mark
->fsn_mark
, inotify_free_mark
);
646 tmp_i_mark
->fsn_mark
.mask
= mask
;
650 if (atomic_read(&group
->inotify_data
.user
->inotify_watches
) >= inotify_max_user_watches
)
653 ret
= inotify_add_to_idr(idr
, idr_lock
, &group
->inotify_data
.last_wd
,
658 /* we are on the idr, now get on the inode */
659 ret
= fsnotify_add_mark(&tmp_i_mark
->fsn_mark
, group
, inode
, NULL
, 0);
661 /* we failed to get on the inode, get off the idr */
662 inotify_remove_from_idr(group
, tmp_i_mark
);
666 /* increment the number of watches the user has */
667 atomic_inc(&group
->inotify_data
.user
->inotify_watches
);
669 /* return the watch descriptor for this new mark */
670 ret
= tmp_i_mark
->wd
;
673 /* match the ref from fsnotify_init_mark() */
674 fsnotify_put_mark(&tmp_i_mark
->fsn_mark
);
679 static int inotify_update_watch(struct fsnotify_group
*group
, struct inode
*inode
, u32 arg
)
684 /* try to update and existing watch with the new arg */
685 ret
= inotify_update_existing_watch(group
, inode
, arg
);
686 /* no mark present, try to add a new one */
688 ret
= inotify_new_watch(group
, inode
, arg
);
690 * inotify_new_watch could race with another thread which did an
691 * inotify_new_watch between the update_existing and the add watch
692 * here, go back and try to update an existing mark again.
700 static struct fsnotify_group
*inotify_new_group(struct user_struct
*user
, unsigned int max_events
)
702 struct fsnotify_group
*group
;
704 group
= fsnotify_alloc_group(&inotify_fsnotify_ops
);
708 group
->max_events
= max_events
;
710 spin_lock_init(&group
->inotify_data
.idr_lock
);
711 idr_init(&group
->inotify_data
.idr
);
712 group
->inotify_data
.last_wd
= 0;
713 group
->inotify_data
.user
= user
;
714 group
->inotify_data
.fa
= NULL
;
720 /* inotify syscalls */
721 SYSCALL_DEFINE1(inotify_init1
, int, flags
)
723 struct fsnotify_group
*group
;
724 struct user_struct
*user
;
727 /* Check the IN_* constants for consistency. */
728 BUILD_BUG_ON(IN_CLOEXEC
!= O_CLOEXEC
);
729 BUILD_BUG_ON(IN_NONBLOCK
!= O_NONBLOCK
);
731 if (flags
& ~(IN_CLOEXEC
| IN_NONBLOCK
))
734 user
= get_current_user();
735 if (unlikely(atomic_read(&user
->inotify_devs
) >=
736 inotify_max_user_instances
)) {
741 /* fsnotify_obtain_group took a reference to group, we put this when we kill the file in the end */
742 group
= inotify_new_group(user
, inotify_max_queued_events
);
744 ret
= PTR_ERR(group
);
748 atomic_inc(&user
->inotify_devs
);
750 ret
= anon_inode_getfd("inotify", &inotify_fops
, group
,
755 fsnotify_put_group(group
);
756 atomic_dec(&user
->inotify_devs
);
762 SYSCALL_DEFINE0(inotify_init
)
764 return sys_inotify_init1(0);
767 SYSCALL_DEFINE3(inotify_add_watch
, int, fd
, const char __user
*, pathname
,
770 struct fsnotify_group
*group
;
774 int ret
, fput_needed
;
777 filp
= fget_light(fd
, &fput_needed
);
781 /* verify that this is indeed an inotify instance */
782 if (unlikely(filp
->f_op
!= &inotify_fops
)) {
787 if (!(mask
& IN_DONT_FOLLOW
))
788 flags
|= LOOKUP_FOLLOW
;
789 if (mask
& IN_ONLYDIR
)
790 flags
|= LOOKUP_DIRECTORY
;
792 ret
= inotify_find_inode(pathname
, &path
, flags
);
796 /* inode held in place by reference to path; group by fget on fd */
797 inode
= path
.dentry
->d_inode
;
798 group
= filp
->private_data
;
800 /* create/update an inode mark */
801 ret
= inotify_update_watch(group
, inode
, mask
);
804 fput_light(filp
, fput_needed
);
808 SYSCALL_DEFINE2(inotify_rm_watch
, int, fd
, __s32
, wd
)
810 struct fsnotify_group
*group
;
811 struct inotify_inode_mark
*i_mark
;
813 int ret
= 0, fput_needed
;
815 filp
= fget_light(fd
, &fput_needed
);
819 /* verify that this is indeed an inotify instance */
821 if (unlikely(filp
->f_op
!= &inotify_fops
))
824 group
= filp
->private_data
;
827 i_mark
= inotify_idr_find(group
, wd
);
828 if (unlikely(!i_mark
))
833 fsnotify_destroy_mark(&i_mark
->fsn_mark
);
835 /* match ref taken by inotify_idr_find */
836 fsnotify_put_mark(&i_mark
->fsn_mark
);
839 fput_light(filp
, fput_needed
);
844 * inotify_user_setup - Our initialization function. Note that we cannnot return
845 * error because we have compiled-in VFS hooks. So an (unlikely) failure here
846 * must result in panic().
848 static int __init
inotify_user_setup(void)
850 BUILD_BUG_ON(IN_ACCESS
!= FS_ACCESS
);
851 BUILD_BUG_ON(IN_MODIFY
!= FS_MODIFY
);
852 BUILD_BUG_ON(IN_ATTRIB
!= FS_ATTRIB
);
853 BUILD_BUG_ON(IN_CLOSE_WRITE
!= FS_CLOSE_WRITE
);
854 BUILD_BUG_ON(IN_CLOSE_NOWRITE
!= FS_CLOSE_NOWRITE
);
855 BUILD_BUG_ON(IN_OPEN
!= FS_OPEN
);
856 BUILD_BUG_ON(IN_MOVED_FROM
!= FS_MOVED_FROM
);
857 BUILD_BUG_ON(IN_MOVED_TO
!= FS_MOVED_TO
);
858 BUILD_BUG_ON(IN_CREATE
!= FS_CREATE
);
859 BUILD_BUG_ON(IN_DELETE
!= FS_DELETE
);
860 BUILD_BUG_ON(IN_DELETE_SELF
!= FS_DELETE_SELF
);
861 BUILD_BUG_ON(IN_MOVE_SELF
!= FS_MOVE_SELF
);
862 BUILD_BUG_ON(IN_UNMOUNT
!= FS_UNMOUNT
);
863 BUILD_BUG_ON(IN_Q_OVERFLOW
!= FS_Q_OVERFLOW
);
864 BUILD_BUG_ON(IN_IGNORED
!= FS_IN_IGNORED
);
865 BUILD_BUG_ON(IN_EXCL_UNLINK
!= FS_EXCL_UNLINK
);
866 BUILD_BUG_ON(IN_ISDIR
!= FS_ISDIR
);
867 BUILD_BUG_ON(IN_ONESHOT
!= FS_IN_ONESHOT
);
869 BUG_ON(hweight32(ALL_INOTIFY_BITS
) != 21);
871 inotify_inode_mark_cachep
= KMEM_CACHE(inotify_inode_mark
, SLAB_PANIC
);
872 event_priv_cachep
= KMEM_CACHE(inotify_event_private_data
, SLAB_PANIC
);
874 inotify_max_queued_events
= 16384;
875 inotify_max_user_instances
= 128;
876 inotify_max_user_watches
= 8192;
880 module_init(inotify_user_setup
);