13e0a4e85SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2272eb014SEric Paris /* 3272eb014SEric Paris * fs/inotify_user.c - inotify support for userspace 4272eb014SEric Paris * 5272eb014SEric Paris * Authors: 6272eb014SEric Paris * John McCutchan <ttb@tentacle.dhs.org> 7272eb014SEric Paris * Robert Love <rml@novell.com> 8272eb014SEric Paris * 9272eb014SEric Paris * Copyright (C) 2005 John McCutchan 10272eb014SEric Paris * Copyright 2006 Hewlett-Packard Development Company, L.P. 11272eb014SEric Paris * 1263c882a0SEric Paris * Copyright (C) 2009 Eric Paris <Red Hat Inc> 1363c882a0SEric Paris * inotify was largely rewriten to make use of the fsnotify infrastructure 14272eb014SEric Paris */ 15272eb014SEric Paris 16272eb014SEric Paris #include <linux/file.h> 1763c882a0SEric Paris #include <linux/fs.h> /* struct inode */ 1863c882a0SEric Paris #include <linux/fsnotify_backend.h> 1963c882a0SEric Paris #include <linux/idr.h> 20c013d5a4SPaul Gortmaker #include <linux/init.h> /* fs_initcall */ 21272eb014SEric Paris #include <linux/inotify.h> 2263c882a0SEric Paris #include <linux/kernel.h> /* roundup() */ 2363c882a0SEric Paris #include <linux/namei.h> /* LOOKUP_FOLLOW */ 24174cd4b1SIngo Molnar #include <linux/sched/signal.h> 2563c882a0SEric Paris #include <linux/slab.h> /* struct kmem_cache */ 26272eb014SEric Paris #include <linux/syscalls.h> 2763c882a0SEric Paris #include <linux/types.h> 28c44dcc56SAl Viro #include <linux/anon_inodes.h> 2963c882a0SEric Paris #include <linux/uaccess.h> 3063c882a0SEric Paris #include <linux/poll.h> 3163c882a0SEric Paris #include <linux/wait.h> 32d46eb14bSShakeel Butt #include <linux/memcontrol.h> 33ac5656d8SAaron Goidel #include <linux/security.h> 3463c882a0SEric Paris 3563c882a0SEric Paris #include "inotify.h" 36be77196bSCyrill Gorcunov #include "../fdinfo.h" 37272eb014SEric Paris 38272eb014SEric Paris #include <asm/ioctls.h> 39272eb014SEric Paris 4092890123SWaiman Long /* 4192890123SWaiman Long * An inotify watch requires allocating an inotify_inode_mark structure as 4292890123SWaiman Long * well as pinning the watched inode. Doubling the size of a VFS inode 4392890123SWaiman Long * should be more than enough to cover the additional filesystem inode 4492890123SWaiman Long * size increase. 4592890123SWaiman Long */ 4692890123SWaiman Long #define INOTIFY_WATCH_COST (sizeof(struct inotify_inode_mark) + \ 4792890123SWaiman Long 2 * sizeof(struct inode)) 4892890123SWaiman Long 491cce1eeaSNikolay Borisov /* configurable via /proc/sys/fs/inotify/ */ 50272eb014SEric Paris static int inotify_max_queued_events __read_mostly; 5163c882a0SEric Paris 52054c636eSJan Kara struct kmem_cache *inotify_inode_mark_cachep __read_mostly; 53272eb014SEric Paris 54272eb014SEric Paris #ifdef CONFIG_SYSCTL 55272eb014SEric Paris 56272eb014SEric Paris #include <linux/sysctl.h> 57272eb014SEric Paris 5892f778ddSJoe Perches struct ctl_table inotify_table[] = { 59272eb014SEric Paris { 60272eb014SEric Paris .procname = "max_user_instances", 611cce1eeaSNikolay Borisov .data = &init_user_ns.ucount_max[UCOUNT_INOTIFY_INSTANCES], 62272eb014SEric Paris .maxlen = sizeof(int), 63272eb014SEric Paris .mode = 0644, 646d456111SEric W. Biederman .proc_handler = proc_dointvec_minmax, 65eec4844fSMatteo Croce .extra1 = SYSCTL_ZERO, 66272eb014SEric Paris }, 67272eb014SEric Paris { 68272eb014SEric Paris .procname = "max_user_watches", 691cce1eeaSNikolay Borisov .data = &init_user_ns.ucount_max[UCOUNT_INOTIFY_WATCHES], 70272eb014SEric Paris .maxlen = sizeof(int), 71272eb014SEric Paris .mode = 0644, 726d456111SEric W. Biederman .proc_handler = proc_dointvec_minmax, 73eec4844fSMatteo Croce .extra1 = SYSCTL_ZERO, 74272eb014SEric Paris }, 75272eb014SEric Paris { 76272eb014SEric Paris .procname = "max_queued_events", 77272eb014SEric Paris .data = &inotify_max_queued_events, 78272eb014SEric Paris .maxlen = sizeof(int), 79272eb014SEric Paris .mode = 0644, 806d456111SEric W. Biederman .proc_handler = proc_dointvec_minmax, 81eec4844fSMatteo Croce .extra1 = SYSCTL_ZERO 82272eb014SEric Paris }, 83ab09203eSEric W. Biederman { } 84272eb014SEric Paris }; 85272eb014SEric Paris #endif /* CONFIG_SYSCTL */ 86272eb014SEric Paris 87957f7b47SAmir Goldstein static inline __u32 inotify_arg_to_mask(struct inode *inode, u32 arg) 88272eb014SEric Paris { 8963c882a0SEric Paris __u32 mask; 9063c882a0SEric Paris 91611da04fSEric Paris /* 92957f7b47SAmir Goldstein * Everything should accept their own ignored and should receive events 93957f7b47SAmir Goldstein * when the inode is unmounted. All directories care about children. 94611da04fSEric Paris */ 95957f7b47SAmir Goldstein mask = (FS_IN_IGNORED | FS_UNMOUNT); 96957f7b47SAmir Goldstein if (S_ISDIR(inode->i_mode)) 97957f7b47SAmir Goldstein mask |= FS_EVENT_ON_CHILD; 9863c882a0SEric Paris 9963c882a0SEric Paris /* mask off the flags used to open the fd */ 1008c1934c8SEric Paris mask |= (arg & (IN_ALL_EVENTS | IN_ONESHOT | IN_EXCL_UNLINK)); 10163c882a0SEric Paris 10263c882a0SEric Paris return mask; 103272eb014SEric Paris } 104272eb014SEric Paris 10563c882a0SEric Paris static inline u32 inotify_mask_to_arg(__u32 mask) 106272eb014SEric Paris { 10763c882a0SEric Paris return mask & (IN_ALL_EVENTS | IN_ISDIR | IN_UNMOUNT | IN_IGNORED | 10863c882a0SEric Paris IN_Q_OVERFLOW); 109272eb014SEric Paris } 110272eb014SEric Paris 11163c882a0SEric Paris /* intofiy userspace file descriptor functions */ 112076ccb76SAl Viro static __poll_t inotify_poll(struct file *file, poll_table *wait) 113272eb014SEric Paris { 11463c882a0SEric Paris struct fsnotify_group *group = file->private_data; 115076ccb76SAl Viro __poll_t ret = 0; 116272eb014SEric Paris 11763c882a0SEric Paris poll_wait(file, &group->notification_waitq, wait); 118c21dbe20SJan Kara spin_lock(&group->notification_lock); 11963c882a0SEric Paris if (!fsnotify_notify_queue_is_empty(group)) 120a9a08845SLinus Torvalds ret = EPOLLIN | EPOLLRDNORM; 121c21dbe20SJan Kara spin_unlock(&group->notification_lock); 122272eb014SEric Paris 123272eb014SEric Paris return ret; 124272eb014SEric Paris } 125272eb014SEric Paris 1267053aee2SJan Kara static int round_event_name_len(struct fsnotify_event *fsn_event) 127e9fe6904SJan Kara { 1287053aee2SJan Kara struct inotify_event_info *event; 1297053aee2SJan Kara 1307053aee2SJan Kara event = INOTIFY_E(fsn_event); 131e9fe6904SJan Kara if (!event->name_len) 132e9fe6904SJan Kara return 0; 133e9fe6904SJan Kara return roundup(event->name_len + 1, sizeof(struct inotify_event)); 134e9fe6904SJan Kara } 135e9fe6904SJan Kara 1363632dee2SVegard Nossum /* 1373632dee2SVegard Nossum * Get an inotify_kernel_event if one exists and is small 1383632dee2SVegard Nossum * enough to fit in "count". Return an error pointer if 1393632dee2SVegard Nossum * not large enough. 1403632dee2SVegard Nossum * 141c21dbe20SJan Kara * Called with the group->notification_lock held. 1423632dee2SVegard Nossum */ 14363c882a0SEric Paris static struct fsnotify_event *get_one_event(struct fsnotify_group *group, 1443632dee2SVegard Nossum size_t count) 1453632dee2SVegard Nossum { 1463632dee2SVegard Nossum size_t event_size = sizeof(struct inotify_event); 14763c882a0SEric Paris struct fsnotify_event *event; 1483632dee2SVegard Nossum 14963c882a0SEric Paris if (fsnotify_notify_queue_is_empty(group)) 1503632dee2SVegard Nossum return NULL; 1513632dee2SVegard Nossum 1528ba8fa91SJan Kara event = fsnotify_peek_first_event(group); 15363c882a0SEric Paris 1545ba08e2eSEric Paris pr_debug("%s: group=%p event=%p\n", __func__, group, event); 1555ba08e2eSEric Paris 156e9fe6904SJan Kara event_size += round_event_name_len(event); 1573632dee2SVegard Nossum if (event_size > count) 1583632dee2SVegard Nossum return ERR_PTR(-EINVAL); 1593632dee2SVegard Nossum 160c21dbe20SJan Kara /* held the notification_lock the whole time, so this is the 16163c882a0SEric Paris * same event we peeked above */ 1628ba8fa91SJan Kara fsnotify_remove_first_event(group); 16363c882a0SEric Paris 16463c882a0SEric Paris return event; 1653632dee2SVegard Nossum } 1663632dee2SVegard Nossum 1673632dee2SVegard Nossum /* 1683632dee2SVegard Nossum * Copy an event to user space, returning how much we copied. 1693632dee2SVegard Nossum * 1703632dee2SVegard Nossum * We already checked that the event size is smaller than the 1713632dee2SVegard Nossum * buffer we had in "get_one_event()" above. 1723632dee2SVegard Nossum */ 17363c882a0SEric Paris static ssize_t copy_event_to_user(struct fsnotify_group *group, 1747053aee2SJan Kara struct fsnotify_event *fsn_event, 1753632dee2SVegard Nossum char __user *buf) 1763632dee2SVegard Nossum { 17763c882a0SEric Paris struct inotify_event inotify_event; 1787053aee2SJan Kara struct inotify_event_info *event; 1793632dee2SVegard Nossum size_t event_size = sizeof(struct inotify_event); 180e9fe6904SJan Kara size_t name_len; 181e9fe6904SJan Kara size_t pad_name_len; 1823632dee2SVegard Nossum 1837053aee2SJan Kara pr_debug("%s: group=%p event=%p\n", __func__, group, fsn_event); 1845ba08e2eSEric Paris 1857053aee2SJan Kara event = INOTIFY_E(fsn_event); 186e9fe6904SJan Kara name_len = event->name_len; 187b962e731SBrian Rogers /* 188e9fe6904SJan Kara * round up name length so it is a multiple of event_size 1890db501bdSEric W. Biederman * plus an extra byte for the terminating '\0'. 1900db501bdSEric W. Biederman */ 1917053aee2SJan Kara pad_name_len = round_event_name_len(fsn_event); 192e9fe6904SJan Kara inotify_event.len = pad_name_len; 193a0a92d26SAmir Goldstein inotify_event.mask = inotify_mask_to_arg(event->mask); 1947053aee2SJan Kara inotify_event.wd = event->wd; 19563c882a0SEric Paris inotify_event.cookie = event->sync_cookie; 19663c882a0SEric Paris 19763c882a0SEric Paris /* send the main event */ 19863c882a0SEric Paris if (copy_to_user(buf, &inotify_event, event_size)) 1993632dee2SVegard Nossum return -EFAULT; 2003632dee2SVegard Nossum 2013632dee2SVegard Nossum buf += event_size; 2023632dee2SVegard Nossum 20363c882a0SEric Paris /* 20463c882a0SEric Paris * fsnotify only stores the pathname, so here we have to send the pathname 20563c882a0SEric Paris * and then pad that pathname out to a multiple of sizeof(inotify_event) 206e9fe6904SJan Kara * with zeros. 20763c882a0SEric Paris */ 208e9fe6904SJan Kara if (pad_name_len) { 20963c882a0SEric Paris /* copy the path name */ 2107053aee2SJan Kara if (copy_to_user(buf, event->name, name_len)) 2113632dee2SVegard Nossum return -EFAULT; 212e9fe6904SJan Kara buf += name_len; 2133632dee2SVegard Nossum 2140db501bdSEric W. Biederman /* fill userspace with 0's */ 215e9fe6904SJan Kara if (clear_user(buf, pad_name_len - name_len)) 21663c882a0SEric Paris return -EFAULT; 217e9fe6904SJan Kara event_size += pad_name_len; 2183632dee2SVegard Nossum } 21963c882a0SEric Paris 2203632dee2SVegard Nossum return event_size; 2213632dee2SVegard Nossum } 2223632dee2SVegard Nossum 223272eb014SEric Paris static ssize_t inotify_read(struct file *file, char __user *buf, 224272eb014SEric Paris size_t count, loff_t *pos) 225272eb014SEric Paris { 22663c882a0SEric Paris struct fsnotify_group *group; 22763c882a0SEric Paris struct fsnotify_event *kevent; 228272eb014SEric Paris char __user *start; 229272eb014SEric Paris int ret; 230e23738a7SPeter Zijlstra DEFINE_WAIT_FUNC(wait, woken_wake_function); 231272eb014SEric Paris 232272eb014SEric Paris start = buf; 23363c882a0SEric Paris group = file->private_data; 234272eb014SEric Paris 235e23738a7SPeter Zijlstra add_wait_queue(&group->notification_waitq, &wait); 236272eb014SEric Paris while (1) { 237c21dbe20SJan Kara spin_lock(&group->notification_lock); 23863c882a0SEric Paris kevent = get_one_event(group, count); 239c21dbe20SJan Kara spin_unlock(&group->notification_lock); 240272eb014SEric Paris 2415ba08e2eSEric Paris pr_debug("%s: group=%p kevent=%p\n", __func__, group, kevent); 2425ba08e2eSEric Paris 2433632dee2SVegard Nossum if (kevent) { 2443632dee2SVegard Nossum ret = PTR_ERR(kevent); 2453632dee2SVegard Nossum if (IS_ERR(kevent)) 246272eb014SEric Paris break; 24763c882a0SEric Paris ret = copy_event_to_user(group, kevent, buf); 2487053aee2SJan Kara fsnotify_destroy_event(group, kevent); 2493632dee2SVegard Nossum if (ret < 0) 2503632dee2SVegard Nossum break; 2513632dee2SVegard Nossum buf += ret; 2523632dee2SVegard Nossum count -= ret; 2533632dee2SVegard Nossum continue; 254272eb014SEric Paris } 255272eb014SEric Paris 2563632dee2SVegard Nossum ret = -EAGAIN; 2573632dee2SVegard Nossum if (file->f_flags & O_NONBLOCK) 258272eb014SEric Paris break; 2591ca39ab9SEric Paris ret = -ERESTARTSYS; 2603632dee2SVegard Nossum if (signal_pending(current)) 2613632dee2SVegard Nossum break; 2623632dee2SVegard Nossum 2633632dee2SVegard Nossum if (start != buf) 2643632dee2SVegard Nossum break; 265272eb014SEric Paris 266e23738a7SPeter Zijlstra wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); 267272eb014SEric Paris } 268e23738a7SPeter Zijlstra remove_wait_queue(&group->notification_waitq, &wait); 269272eb014SEric Paris 2703632dee2SVegard Nossum if (start != buf && ret != -EFAULT) 271272eb014SEric Paris ret = buf - start; 272272eb014SEric Paris return ret; 273272eb014SEric Paris } 274272eb014SEric Paris 275272eb014SEric Paris static int inotify_release(struct inode *ignored, struct file *file) 276272eb014SEric Paris { 27763c882a0SEric Paris struct fsnotify_group *group = file->private_data; 278272eb014SEric Paris 2795ba08e2eSEric Paris pr_debug("%s: group=%p\n", __func__, group); 2805ba08e2eSEric Paris 28163c882a0SEric Paris /* free this group, matching get was inotify_init->fsnotify_obtain_group */ 282d8153d4dSLino Sanfilippo fsnotify_destroy_group(group); 283272eb014SEric Paris 284272eb014SEric Paris return 0; 285272eb014SEric Paris } 286272eb014SEric Paris 287272eb014SEric Paris static long inotify_ioctl(struct file *file, unsigned int cmd, 288272eb014SEric Paris unsigned long arg) 289272eb014SEric Paris { 29063c882a0SEric Paris struct fsnotify_group *group; 2917053aee2SJan Kara struct fsnotify_event *fsn_event; 292272eb014SEric Paris void __user *p; 293272eb014SEric Paris int ret = -ENOTTY; 29463c882a0SEric Paris size_t send_len = 0; 295272eb014SEric Paris 29663c882a0SEric Paris group = file->private_data; 297272eb014SEric Paris p = (void __user *) arg; 298272eb014SEric Paris 2995ba08e2eSEric Paris pr_debug("%s: group=%p cmd=%u\n", __func__, group, cmd); 3005ba08e2eSEric Paris 301272eb014SEric Paris switch (cmd) { 302272eb014SEric Paris case FIONREAD: 303c21dbe20SJan Kara spin_lock(&group->notification_lock); 3047053aee2SJan Kara list_for_each_entry(fsn_event, &group->notification_list, 3057053aee2SJan Kara list) { 30663c882a0SEric Paris send_len += sizeof(struct inotify_event); 3077053aee2SJan Kara send_len += round_event_name_len(fsn_event); 30863c882a0SEric Paris } 309c21dbe20SJan Kara spin_unlock(&group->notification_lock); 31063c882a0SEric Paris ret = put_user(send_len, (int __user *) p); 311272eb014SEric Paris break; 312e1603b6eSKirill Tkhai #ifdef CONFIG_CHECKPOINT_RESTORE 313e1603b6eSKirill Tkhai case INOTIFY_IOC_SETNEXTWD: 314e1603b6eSKirill Tkhai ret = -EINVAL; 315e1603b6eSKirill Tkhai if (arg >= 1 && arg <= INT_MAX) { 316e1603b6eSKirill Tkhai struct inotify_group_private_data *data; 317e1603b6eSKirill Tkhai 318e1603b6eSKirill Tkhai data = &group->inotify_data; 319e1603b6eSKirill Tkhai spin_lock(&data->idr_lock); 320e1603b6eSKirill Tkhai idr_set_cursor(&data->idr, (unsigned int)arg); 321e1603b6eSKirill Tkhai spin_unlock(&data->idr_lock); 322e1603b6eSKirill Tkhai ret = 0; 323e1603b6eSKirill Tkhai } 324e1603b6eSKirill Tkhai break; 325e1603b6eSKirill Tkhai #endif /* CONFIG_CHECKPOINT_RESTORE */ 326272eb014SEric Paris } 327272eb014SEric Paris 328272eb014SEric Paris return ret; 329272eb014SEric Paris } 330272eb014SEric Paris 331272eb014SEric Paris static const struct file_operations inotify_fops = { 332be77196bSCyrill Gorcunov .show_fdinfo = inotify_show_fdinfo, 333272eb014SEric Paris .poll = inotify_poll, 334272eb014SEric Paris .read = inotify_read, 3350a6b6bd5SEric Paris .fasync = fsnotify_fasync, 336272eb014SEric Paris .release = inotify_release, 337272eb014SEric Paris .unlocked_ioctl = inotify_ioctl, 338272eb014SEric Paris .compat_ioctl = inotify_ioctl, 3396038f373SArnd Bergmann .llseek = noop_llseek, 340272eb014SEric Paris }; 341272eb014SEric Paris 342272eb014SEric Paris 34363c882a0SEric Paris /* 34463c882a0SEric Paris * find_inode - resolve a user-given path to a specific inode 34563c882a0SEric Paris */ 346ac5656d8SAaron Goidel static int inotify_find_inode(const char __user *dirname, struct path *path, 347ac5656d8SAaron Goidel unsigned int flags, __u64 mask) 34863c882a0SEric Paris { 34963c882a0SEric Paris int error; 35063c882a0SEric Paris 35163c882a0SEric Paris error = user_path_at(AT_FDCWD, dirname, flags, path); 35263c882a0SEric Paris if (error) 35363c882a0SEric Paris return error; 35463c882a0SEric Paris /* you can only watch an inode if you have read permissions on it */ 35563c882a0SEric Paris error = inode_permission(path->dentry->d_inode, MAY_READ); 356ac5656d8SAaron Goidel if (error) { 357ac5656d8SAaron Goidel path_put(path); 358ac5656d8SAaron Goidel return error; 359ac5656d8SAaron Goidel } 360ac5656d8SAaron Goidel error = security_path_notify(path, mask, 361ac5656d8SAaron Goidel FSNOTIFY_OBJ_TYPE_INODE); 36263c882a0SEric Paris if (error) 36363c882a0SEric Paris path_put(path); 364ac5656d8SAaron Goidel 36563c882a0SEric Paris return error; 36663c882a0SEric Paris } 36763c882a0SEric Paris 368b7ba8371SEric Paris static int inotify_add_to_idr(struct idr *idr, spinlock_t *idr_lock, 369000285deSEric Paris struct inotify_inode_mark *i_mark) 370b7ba8371SEric Paris { 371b7ba8371SEric Paris int ret; 372b7ba8371SEric Paris 3734542da63STejun Heo idr_preload(GFP_KERNEL); 374b7ba8371SEric Paris spin_lock(idr_lock); 3754542da63STejun Heo 376a66c04b4SJeff Layton ret = idr_alloc_cyclic(idr, i_mark, 1, 0, GFP_NOWAIT); 3774542da63STejun Heo if (ret >= 0) { 378b7ba8371SEric Paris /* we added the mark to the idr, take a reference */ 3794542da63STejun Heo i_mark->wd = ret; 380000285deSEric Paris fsnotify_get_mark(&i_mark->fsn_mark); 3817050c488SEric Paris } 382b7ba8371SEric Paris 3834542da63STejun Heo spin_unlock(idr_lock); 3844542da63STejun Heo idr_preload_end(); 3854542da63STejun Heo return ret < 0 ? ret : 0; 386b7ba8371SEric Paris } 387b7ba8371SEric Paris 388000285deSEric Paris static struct inotify_inode_mark *inotify_idr_find_locked(struct fsnotify_group *group, 389b7ba8371SEric Paris int wd) 390b7ba8371SEric Paris { 391b7ba8371SEric Paris struct idr *idr = &group->inotify_data.idr; 392b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 393000285deSEric Paris struct inotify_inode_mark *i_mark; 394b7ba8371SEric Paris 395b7ba8371SEric Paris assert_spin_locked(idr_lock); 396b7ba8371SEric Paris 397000285deSEric Paris i_mark = idr_find(idr, wd); 398000285deSEric Paris if (i_mark) { 399000285deSEric Paris struct fsnotify_mark *fsn_mark = &i_mark->fsn_mark; 400b7ba8371SEric Paris 401000285deSEric Paris fsnotify_get_mark(fsn_mark); 402b7ba8371SEric Paris /* One ref for being in the idr, one ref we just took */ 403ab97f873SElena Reshetova BUG_ON(refcount_read(&fsn_mark->refcnt) < 2); 404b7ba8371SEric Paris } 405b7ba8371SEric Paris 406000285deSEric Paris return i_mark; 407b7ba8371SEric Paris } 408b7ba8371SEric Paris 409000285deSEric Paris static struct inotify_inode_mark *inotify_idr_find(struct fsnotify_group *group, 410b7ba8371SEric Paris int wd) 411b7ba8371SEric Paris { 412000285deSEric Paris struct inotify_inode_mark *i_mark; 413b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 414b7ba8371SEric Paris 415b7ba8371SEric Paris spin_lock(idr_lock); 416000285deSEric Paris i_mark = inotify_idr_find_locked(group, wd); 417b7ba8371SEric Paris spin_unlock(idr_lock); 418b7ba8371SEric Paris 419000285deSEric Paris return i_mark; 420b7ba8371SEric Paris } 421b7ba8371SEric Paris 422dead537dSEric Paris /* 423dead537dSEric Paris * Remove the mark from the idr (if present) and drop the reference 424dead537dSEric Paris * on the mark because it was in the idr. 425dead537dSEric Paris */ 4267e790dd5SEric Paris static void inotify_remove_from_idr(struct fsnotify_group *group, 427000285deSEric Paris struct inotify_inode_mark *i_mark) 4287e790dd5SEric Paris { 429e7253760SJan Kara struct idr *idr = &group->inotify_data.idr; 430b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 431000285deSEric Paris struct inotify_inode_mark *found_i_mark = NULL; 432dead537dSEric Paris int wd; 4337e790dd5SEric Paris 434b7ba8371SEric Paris spin_lock(idr_lock); 435000285deSEric Paris wd = i_mark->wd; 436dead537dSEric Paris 437b7ba8371SEric Paris /* 438000285deSEric Paris * does this i_mark think it is in the idr? we shouldn't get called 439b7ba8371SEric Paris * if it wasn't.... 440b7ba8371SEric Paris */ 441b7ba8371SEric Paris if (wd == -1) { 44225c829afSJan Kara WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p\n", 44325c829afSJan Kara __func__, i_mark, i_mark->wd, i_mark->fsn_mark.group); 444dead537dSEric Paris goto out; 4457e790dd5SEric Paris } 446dead537dSEric Paris 447b7ba8371SEric Paris /* Lets look in the idr to see if we find it */ 448000285deSEric Paris found_i_mark = inotify_idr_find_locked(group, wd); 449000285deSEric Paris if (unlikely(!found_i_mark)) { 45025c829afSJan Kara WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p\n", 45125c829afSJan Kara __func__, i_mark, i_mark->wd, i_mark->fsn_mark.group); 452b7ba8371SEric Paris goto out; 453b7ba8371SEric Paris } 454dead537dSEric Paris 455b7ba8371SEric Paris /* 456000285deSEric Paris * We found an mark in the idr at the right wd, but it's 457000285deSEric Paris * not the mark we were told to remove. eparis seriously 458b7ba8371SEric Paris * fucked up somewhere. 459b7ba8371SEric Paris */ 460000285deSEric Paris if (unlikely(found_i_mark != i_mark)) { 461000285deSEric Paris WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p " 46225c829afSJan Kara "found_i_mark=%p found_i_mark->wd=%d " 46325c829afSJan Kara "found_i_mark->group=%p\n", __func__, i_mark, 46425c829afSJan Kara i_mark->wd, i_mark->fsn_mark.group, found_i_mark, 46525c829afSJan Kara found_i_mark->wd, found_i_mark->fsn_mark.group); 466b7ba8371SEric Paris goto out; 467b7ba8371SEric Paris } 468dead537dSEric Paris 469b7ba8371SEric Paris /* 470b7ba8371SEric Paris * One ref for being in the idr 471b7ba8371SEric Paris * one ref grabbed by inotify_idr_find 472b7ba8371SEric Paris */ 473ab97f873SElena Reshetova if (unlikely(refcount_read(&i_mark->fsn_mark.refcnt) < 2)) { 47425c829afSJan Kara printk(KERN_ERR "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p\n", 47525c829afSJan Kara __func__, i_mark, i_mark->wd, i_mark->fsn_mark.group); 476b7ba8371SEric Paris /* we can't really recover with bad ref cnting.. */ 477b7ba8371SEric Paris BUG(); 478b7ba8371SEric Paris } 479b7ba8371SEric Paris 480e7253760SJan Kara idr_remove(idr, wd); 481e7253760SJan Kara /* Removed from the idr, drop that ref. */ 482e7253760SJan Kara fsnotify_put_mark(&i_mark->fsn_mark); 483dead537dSEric Paris out: 484e7253760SJan Kara i_mark->wd = -1; 485e7253760SJan Kara spin_unlock(idr_lock); 486b7ba8371SEric Paris /* match the ref taken by inotify_idr_find_locked() */ 487000285deSEric Paris if (found_i_mark) 488000285deSEric Paris fsnotify_put_mark(&found_i_mark->fsn_mark); 489dead537dSEric Paris } 490dead537dSEric Paris 49163c882a0SEric Paris /* 492dead537dSEric Paris * Send IN_IGNORED for this wd, remove this wd from the idr. 49363c882a0SEric Paris */ 494000285deSEric Paris void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, 495528da3e9SEric Paris struct fsnotify_group *group) 49663c882a0SEric Paris { 497000285deSEric Paris struct inotify_inode_mark *i_mark; 4987053aee2SJan Kara 4997053aee2SJan Kara /* Queue ignore event for the watch */ 500*1a2620a9SAmir Goldstein inotify_handle_inode_event(fsn_mark, FS_IN_IGNORED, NULL, NULL, NULL, 501*1a2620a9SAmir Goldstein 0); 50263c882a0SEric Paris 5038b99c3ccSLino Sanfilippo i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); 504000285deSEric Paris /* remove this mark from the idr */ 505000285deSEric Paris inotify_remove_from_idr(group, i_mark); 50663c882a0SEric Paris 5071cce1eeaSNikolay Borisov dec_inotify_watches(group->inotify_data.ucounts); 50863c882a0SEric Paris } 50963c882a0SEric Paris 51052cef755SEric Paris static int inotify_update_existing_watch(struct fsnotify_group *group, 51152cef755SEric Paris struct inode *inode, 51252cef755SEric Paris u32 arg) 51363c882a0SEric Paris { 514000285deSEric Paris struct fsnotify_mark *fsn_mark; 515000285deSEric Paris struct inotify_inode_mark *i_mark; 51663c882a0SEric Paris __u32 old_mask, new_mask; 51752cef755SEric Paris __u32 mask; 51852cef755SEric Paris int add = (arg & IN_MASK_ADD); 5194d97f7d5SHenry Wilson int create = (arg & IN_MASK_CREATE); 52052cef755SEric Paris int ret; 52163c882a0SEric Paris 522957f7b47SAmir Goldstein mask = inotify_arg_to_mask(inode, arg); 52363c882a0SEric Paris 524b1362edfSJan Kara fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group); 525000285deSEric Paris if (!fsn_mark) 52652cef755SEric Paris return -ENOENT; 52762c9d267SZhangXiaoxu else if (create) { 52862c9d267SZhangXiaoxu ret = -EEXIST; 52962c9d267SZhangXiaoxu goto out; 53062c9d267SZhangXiaoxu } 53152cef755SEric Paris 532000285deSEric Paris i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); 53375fe2b26SEric Paris 534000285deSEric Paris spin_lock(&fsn_mark->lock); 535000285deSEric Paris old_mask = fsn_mark->mask; 53690b1e7a5SEric Paris if (add) 53766d2b81bSJan Kara fsn_mark->mask |= mask; 53890b1e7a5SEric Paris else 53966d2b81bSJan Kara fsn_mark->mask = mask; 540000285deSEric Paris new_mask = fsn_mark->mask; 541000285deSEric Paris spin_unlock(&fsn_mark->lock); 54263c882a0SEric Paris 54363c882a0SEric Paris if (old_mask != new_mask) { 54463c882a0SEric Paris /* more bits in old than in new? */ 54563c882a0SEric Paris int dropped = (old_mask & ~new_mask); 546000285deSEric Paris /* more bits in this fsn_mark than the inode's mask? */ 54763c882a0SEric Paris int do_inode = (new_mask & ~inode->i_fsnotify_mask); 54863c882a0SEric Paris 549000285deSEric Paris /* update the inode with this new fsn_mark */ 55063c882a0SEric Paris if (dropped || do_inode) 5518920d273SJan Kara fsnotify_recalc_mask(inode->i_fsnotify_marks); 55263c882a0SEric Paris 55363c882a0SEric Paris } 55463c882a0SEric Paris 55552cef755SEric Paris /* return the wd */ 556000285deSEric Paris ret = i_mark->wd; 55752cef755SEric Paris 55862c9d267SZhangXiaoxu out: 559d0775441SEric Paris /* match the get from fsnotify_find_mark() */ 560000285deSEric Paris fsnotify_put_mark(fsn_mark); 56175fe2b26SEric Paris 56252cef755SEric Paris return ret; 56363c882a0SEric Paris } 5647e790dd5SEric Paris 56552cef755SEric Paris static int inotify_new_watch(struct fsnotify_group *group, 56652cef755SEric Paris struct inode *inode, 56752cef755SEric Paris u32 arg) 56852cef755SEric Paris { 569000285deSEric Paris struct inotify_inode_mark *tmp_i_mark; 57052cef755SEric Paris __u32 mask; 57152cef755SEric Paris int ret; 572b7ba8371SEric Paris struct idr *idr = &group->inotify_data.idr; 573b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 57452cef755SEric Paris 575957f7b47SAmir Goldstein mask = inotify_arg_to_mask(inode, arg); 57652cef755SEric Paris 577000285deSEric Paris tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL); 578000285deSEric Paris if (unlikely(!tmp_i_mark)) 57952cef755SEric Paris return -ENOMEM; 58052cef755SEric Paris 581054c636eSJan Kara fsnotify_init_mark(&tmp_i_mark->fsn_mark, group); 582000285deSEric Paris tmp_i_mark->fsn_mark.mask = mask; 583000285deSEric Paris tmp_i_mark->wd = -1; 58452cef755SEric Paris 585a66c04b4SJeff Layton ret = inotify_add_to_idr(idr, idr_lock, tmp_i_mark); 586b7ba8371SEric Paris if (ret) 58752cef755SEric Paris goto out_err; 58852cef755SEric Paris 5891cce1eeaSNikolay Borisov /* increment the number of watches the user has */ 5901cce1eeaSNikolay Borisov if (!inc_inotify_watches(group->inotify_data.ucounts)) { 5911cce1eeaSNikolay Borisov inotify_remove_from_idr(group, tmp_i_mark); 5921cce1eeaSNikolay Borisov ret = -ENOSPC; 5931cce1eeaSNikolay Borisov goto out_err; 5941cce1eeaSNikolay Borisov } 5951cce1eeaSNikolay Borisov 59652cef755SEric Paris /* we are on the idr, now get on the inode */ 597b249f5beSAmir Goldstein ret = fsnotify_add_inode_mark_locked(&tmp_i_mark->fsn_mark, inode, 0); 59852cef755SEric Paris if (ret) { 59952cef755SEric Paris /* we failed to get on the inode, get off the idr */ 600000285deSEric Paris inotify_remove_from_idr(group, tmp_i_mark); 60152cef755SEric Paris goto out_err; 60252cef755SEric Paris } 60352cef755SEric Paris 60452cef755SEric Paris 605000285deSEric Paris /* return the watch descriptor for this new mark */ 606000285deSEric Paris ret = tmp_i_mark->wd; 60752cef755SEric Paris 60852cef755SEric Paris out_err: 609000285deSEric Paris /* match the ref from fsnotify_init_mark() */ 610000285deSEric Paris fsnotify_put_mark(&tmp_i_mark->fsn_mark); 61152cef755SEric Paris 61252cef755SEric Paris return ret; 61352cef755SEric Paris } 61452cef755SEric Paris 61552cef755SEric Paris static int inotify_update_watch(struct fsnotify_group *group, struct inode *inode, u32 arg) 61652cef755SEric Paris { 61752cef755SEric Paris int ret = 0; 61852cef755SEric Paris 619e1e5a9f8SLino Sanfilippo mutex_lock(&group->mark_mutex); 62052cef755SEric Paris /* try to update and existing watch with the new arg */ 62152cef755SEric Paris ret = inotify_update_existing_watch(group, inode, arg); 62252cef755SEric Paris /* no mark present, try to add a new one */ 62352cef755SEric Paris if (ret == -ENOENT) 62452cef755SEric Paris ret = inotify_new_watch(group, inode, arg); 625e1e5a9f8SLino Sanfilippo mutex_unlock(&group->mark_mutex); 62652cef755SEric Paris 62763c882a0SEric Paris return ret; 62863c882a0SEric Paris } 62963c882a0SEric Paris 630d0de4dc5SEric Paris static struct fsnotify_group *inotify_new_group(unsigned int max_events) 63163c882a0SEric Paris { 63263c882a0SEric Paris struct fsnotify_group *group; 633ff57cd58SJan Kara struct inotify_event_info *oevent; 63463c882a0SEric Paris 6350d2e2a1dSEric Paris group = fsnotify_alloc_group(&inotify_fsnotify_ops); 63663c882a0SEric Paris if (IS_ERR(group)) 63763c882a0SEric Paris return group; 63863c882a0SEric Paris 639ff57cd58SJan Kara oevent = kmalloc(sizeof(struct inotify_event_info), GFP_KERNEL); 640ff57cd58SJan Kara if (unlikely(!oevent)) { 641ff57cd58SJan Kara fsnotify_destroy_group(group); 642ff57cd58SJan Kara return ERR_PTR(-ENOMEM); 643ff57cd58SJan Kara } 644ff57cd58SJan Kara group->overflow_event = &oevent->fse; 645dfc2d259SAmir Goldstein fsnotify_init_event(group->overflow_event, 0); 646a0a92d26SAmir Goldstein oevent->mask = FS_Q_OVERFLOW; 647ff57cd58SJan Kara oevent->wd = -1; 648ff57cd58SJan Kara oevent->sync_cookie = 0; 649ff57cd58SJan Kara oevent->name_len = 0; 650ff57cd58SJan Kara 65163c882a0SEric Paris group->max_events = max_events; 652d46eb14bSShakeel Butt group->memcg = get_mem_cgroup_from_mm(current->mm); 65363c882a0SEric Paris 65463c882a0SEric Paris spin_lock_init(&group->inotify_data.idr_lock); 65563c882a0SEric Paris idr_init(&group->inotify_data.idr); 6561cce1eeaSNikolay Borisov group->inotify_data.ucounts = inc_ucount(current_user_ns(), 6571cce1eeaSNikolay Borisov current_euid(), 6581cce1eeaSNikolay Borisov UCOUNT_INOTIFY_INSTANCES); 659d0de4dc5SEric Paris 6601cce1eeaSNikolay Borisov if (!group->inotify_data.ucounts) { 661d8153d4dSLino Sanfilippo fsnotify_destroy_group(group); 662d0de4dc5SEric Paris return ERR_PTR(-EMFILE); 663d0de4dc5SEric Paris } 66463c882a0SEric Paris 66563c882a0SEric Paris return group; 66663c882a0SEric Paris } 66763c882a0SEric Paris 66863c882a0SEric Paris 66963c882a0SEric Paris /* inotify syscalls */ 670d0d89d1eSDominik Brodowski static int do_inotify_init(int flags) 671272eb014SEric Paris { 67263c882a0SEric Paris struct fsnotify_group *group; 673c44dcc56SAl Viro int ret; 674272eb014SEric Paris 675272eb014SEric Paris /* Check the IN_* constants for consistency. */ 676272eb014SEric Paris BUILD_BUG_ON(IN_CLOEXEC != O_CLOEXEC); 677272eb014SEric Paris BUILD_BUG_ON(IN_NONBLOCK != O_NONBLOCK); 678272eb014SEric Paris 679272eb014SEric Paris if (flags & ~(IN_CLOEXEC | IN_NONBLOCK)) 680272eb014SEric Paris return -EINVAL; 681272eb014SEric Paris 68263c882a0SEric Paris /* fsnotify_obtain_group took a reference to group, we put this when we kill the file in the end */ 683d0de4dc5SEric Paris group = inotify_new_group(inotify_max_queued_events); 684d0de4dc5SEric Paris if (IS_ERR(group)) 685d0de4dc5SEric Paris return PTR_ERR(group); 686825f9692SAl Viro 687c44dcc56SAl Viro ret = anon_inode_getfd("inotify", &inotify_fops, group, 688c44dcc56SAl Viro O_RDONLY | flags); 689d0de4dc5SEric Paris if (ret < 0) 690d8153d4dSLino Sanfilippo fsnotify_destroy_group(group); 691d0de4dc5SEric Paris 692272eb014SEric Paris return ret; 693272eb014SEric Paris } 694272eb014SEric Paris 695d0d89d1eSDominik Brodowski SYSCALL_DEFINE1(inotify_init1, int, flags) 696d0d89d1eSDominik Brodowski { 697d0d89d1eSDominik Brodowski return do_inotify_init(flags); 698d0d89d1eSDominik Brodowski } 699d0d89d1eSDominik Brodowski 700938bb9f5SHeiko Carstens SYSCALL_DEFINE0(inotify_init) 701272eb014SEric Paris { 702d0d89d1eSDominik Brodowski return do_inotify_init(0); 703272eb014SEric Paris } 704272eb014SEric Paris 7052e4d0924SHeiko Carstens SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, 7062e4d0924SHeiko Carstens u32, mask) 707272eb014SEric Paris { 70863c882a0SEric Paris struct fsnotify_group *group; 709272eb014SEric Paris struct inode *inode; 710272eb014SEric Paris struct path path; 7112903ff01SAl Viro struct fd f; 7122903ff01SAl Viro int ret; 713272eb014SEric Paris unsigned flags = 0; 714272eb014SEric Paris 715d30e2c05SDave Hansen /* 716d30e2c05SDave Hansen * We share a lot of code with fs/dnotify. We also share 717d30e2c05SDave Hansen * the bit layout between inotify's IN_* and the fsnotify 718d30e2c05SDave Hansen * FS_*. This check ensures that only the inotify IN_* 719d30e2c05SDave Hansen * bits get passed in and set in watches/events. 720d30e2c05SDave Hansen */ 721d30e2c05SDave Hansen if (unlikely(mask & ~ALL_INOTIFY_BITS)) 722d30e2c05SDave Hansen return -EINVAL; 723d30e2c05SDave Hansen /* 724d30e2c05SDave Hansen * Require at least one valid bit set in the mask. 725d30e2c05SDave Hansen * Without _something_ set, we would have no events to 726d30e2c05SDave Hansen * watch for. 727d30e2c05SDave Hansen */ 72804df32faSZhao Hongjiang if (unlikely(!(mask & ALL_INOTIFY_BITS))) 72904df32faSZhao Hongjiang return -EINVAL; 73004df32faSZhao Hongjiang 7312903ff01SAl Viro f = fdget(fd); 7322903ff01SAl Viro if (unlikely(!f.file)) 733272eb014SEric Paris return -EBADF; 734272eb014SEric Paris 7354d97f7d5SHenry Wilson /* IN_MASK_ADD and IN_MASK_CREATE don't make sense together */ 736125892edSTetsuo Handa if (unlikely((mask & IN_MASK_ADD) && (mask & IN_MASK_CREATE))) { 737125892edSTetsuo Handa ret = -EINVAL; 738125892edSTetsuo Handa goto fput_and_out; 739125892edSTetsuo Handa } 7404d97f7d5SHenry Wilson 741272eb014SEric Paris /* verify that this is indeed an inotify instance */ 7422903ff01SAl Viro if (unlikely(f.file->f_op != &inotify_fops)) { 743272eb014SEric Paris ret = -EINVAL; 744272eb014SEric Paris goto fput_and_out; 745272eb014SEric Paris } 746272eb014SEric Paris 747272eb014SEric Paris if (!(mask & IN_DONT_FOLLOW)) 748272eb014SEric Paris flags |= LOOKUP_FOLLOW; 749272eb014SEric Paris if (mask & IN_ONLYDIR) 750272eb014SEric Paris flags |= LOOKUP_DIRECTORY; 751272eb014SEric Paris 752ac5656d8SAaron Goidel ret = inotify_find_inode(pathname, &path, flags, 753ac5656d8SAaron Goidel (mask & IN_ALL_EVENTS)); 75463c882a0SEric Paris if (ret) 755272eb014SEric Paris goto fput_and_out; 756272eb014SEric Paris 75763c882a0SEric Paris /* inode held in place by reference to path; group by fget on fd */ 758272eb014SEric Paris inode = path.dentry->d_inode; 7592903ff01SAl Viro group = f.file->private_data; 760272eb014SEric Paris 76163c882a0SEric Paris /* create/update an inode mark */ 76263c882a0SEric Paris ret = inotify_update_watch(group, inode, mask); 763272eb014SEric Paris path_put(&path); 764272eb014SEric Paris fput_and_out: 7652903ff01SAl Viro fdput(f); 766272eb014SEric Paris return ret; 767272eb014SEric Paris } 768272eb014SEric Paris 7692e4d0924SHeiko Carstens SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd) 770272eb014SEric Paris { 77163c882a0SEric Paris struct fsnotify_group *group; 772000285deSEric Paris struct inotify_inode_mark *i_mark; 7732903ff01SAl Viro struct fd f; 7747b26aa24Syoungjun int ret = -EINVAL; 775272eb014SEric Paris 7762903ff01SAl Viro f = fdget(fd); 7772903ff01SAl Viro if (unlikely(!f.file)) 778272eb014SEric Paris return -EBADF; 779272eb014SEric Paris 780272eb014SEric Paris /* verify that this is indeed an inotify instance */ 7812903ff01SAl Viro if (unlikely(f.file->f_op != &inotify_fops)) 782272eb014SEric Paris goto out; 783272eb014SEric Paris 7842903ff01SAl Viro group = f.file->private_data; 785272eb014SEric Paris 786000285deSEric Paris i_mark = inotify_idr_find(group, wd); 787000285deSEric Paris if (unlikely(!i_mark)) 78863c882a0SEric Paris goto out; 78963c882a0SEric Paris 790b7ba8371SEric Paris ret = 0; 791b7ba8371SEric Paris 792e2a29943SLino Sanfilippo fsnotify_destroy_mark(&i_mark->fsn_mark, group); 793b7ba8371SEric Paris 794b7ba8371SEric Paris /* match ref taken by inotify_idr_find */ 795000285deSEric Paris fsnotify_put_mark(&i_mark->fsn_mark); 796272eb014SEric Paris 797272eb014SEric Paris out: 7982903ff01SAl Viro fdput(f); 799272eb014SEric Paris return ret; 800272eb014SEric Paris } 801272eb014SEric Paris 802272eb014SEric Paris /* 803ae0e47f0SJustin P. Mattock * inotify_user_setup - Our initialization function. Note that we cannot return 804272eb014SEric Paris * error because we have compiled-in VFS hooks. So an (unlikely) failure here 805272eb014SEric Paris * must result in panic(). 806272eb014SEric Paris */ 807272eb014SEric Paris static int __init inotify_user_setup(void) 808272eb014SEric Paris { 80992890123SWaiman Long unsigned long watches_max; 81092890123SWaiman Long struct sysinfo si; 81192890123SWaiman Long 81292890123SWaiman Long si_meminfo(&si); 81392890123SWaiman Long /* 81492890123SWaiman Long * Allow up to 1% of addressable memory to be allocated for inotify 81592890123SWaiman Long * watches (per user) limited to the range [8192, 1048576]. 81692890123SWaiman Long */ 81792890123SWaiman Long watches_max = (((si.totalram - si.totalhigh) / 100) << PAGE_SHIFT) / 81892890123SWaiman Long INOTIFY_WATCH_COST; 81992890123SWaiman Long watches_max = clamp(watches_max, 8192UL, 1048576UL); 82092890123SWaiman Long 821f874e1acSEric Paris BUILD_BUG_ON(IN_ACCESS != FS_ACCESS); 822f874e1acSEric Paris BUILD_BUG_ON(IN_MODIFY != FS_MODIFY); 823f874e1acSEric Paris BUILD_BUG_ON(IN_ATTRIB != FS_ATTRIB); 824f874e1acSEric Paris BUILD_BUG_ON(IN_CLOSE_WRITE != FS_CLOSE_WRITE); 825f874e1acSEric Paris BUILD_BUG_ON(IN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE); 826f874e1acSEric Paris BUILD_BUG_ON(IN_OPEN != FS_OPEN); 827f874e1acSEric Paris BUILD_BUG_ON(IN_MOVED_FROM != FS_MOVED_FROM); 828f874e1acSEric Paris BUILD_BUG_ON(IN_MOVED_TO != FS_MOVED_TO); 829f874e1acSEric Paris BUILD_BUG_ON(IN_CREATE != FS_CREATE); 830f874e1acSEric Paris BUILD_BUG_ON(IN_DELETE != FS_DELETE); 831f874e1acSEric Paris BUILD_BUG_ON(IN_DELETE_SELF != FS_DELETE_SELF); 832f874e1acSEric Paris BUILD_BUG_ON(IN_MOVE_SELF != FS_MOVE_SELF); 833f874e1acSEric Paris BUILD_BUG_ON(IN_UNMOUNT != FS_UNMOUNT); 834f874e1acSEric Paris BUILD_BUG_ON(IN_Q_OVERFLOW != FS_Q_OVERFLOW); 835f874e1acSEric Paris BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED); 836f874e1acSEric Paris BUILD_BUG_ON(IN_EXCL_UNLINK != FS_EXCL_UNLINK); 837b29866aaSEric Paris BUILD_BUG_ON(IN_ISDIR != FS_ISDIR); 838f874e1acSEric Paris BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT); 839f874e1acSEric Paris 840a39f7ec4SAmir Goldstein BUILD_BUG_ON(HWEIGHT32(ALL_INOTIFY_BITS) != 22); 841f874e1acSEric Paris 842d46eb14bSShakeel Butt inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark, 843d46eb14bSShakeel Butt SLAB_PANIC|SLAB_ACCOUNT); 84463c882a0SEric Paris 845272eb014SEric Paris inotify_max_queued_events = 16384; 8461cce1eeaSNikolay Borisov init_user_ns.ucount_max[UCOUNT_INOTIFY_INSTANCES] = 128; 84792890123SWaiman Long init_user_ns.ucount_max[UCOUNT_INOTIFY_WATCHES] = watches_max; 848272eb014SEric Paris 849272eb014SEric Paris return 0; 850272eb014SEric Paris } 851c013d5a4SPaul Gortmaker fs_initcall(inotify_user_setup); 852