1272eb014SEric Paris /* 2272eb014SEric Paris * fs/inotify_user.c - inotify support for userspace 3272eb014SEric Paris * 4272eb014SEric Paris * Authors: 5272eb014SEric Paris * John McCutchan <ttb@tentacle.dhs.org> 6272eb014SEric Paris * Robert Love <rml@novell.com> 7272eb014SEric Paris * 8272eb014SEric Paris * Copyright (C) 2005 John McCutchan 9272eb014SEric Paris * Copyright 2006 Hewlett-Packard Development Company, L.P. 10272eb014SEric Paris * 1163c882a0SEric Paris * Copyright (C) 2009 Eric Paris <Red Hat Inc> 1263c882a0SEric Paris * inotify was largely rewriten to make use of the fsnotify infrastructure 1363c882a0SEric Paris * 14272eb014SEric Paris * This program is free software; you can redistribute it and/or modify it 15272eb014SEric Paris * under the terms of the GNU General Public License as published by the 16272eb014SEric Paris * Free Software Foundation; either version 2, or (at your option) any 17272eb014SEric Paris * later version. 18272eb014SEric Paris * 19272eb014SEric Paris * This program is distributed in the hope that it will be useful, but 20272eb014SEric Paris * WITHOUT ANY WARRANTY; without even the implied warranty of 21272eb014SEric Paris * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22272eb014SEric Paris * General Public License for more details. 23272eb014SEric Paris */ 24272eb014SEric Paris 25272eb014SEric Paris #include <linux/file.h> 2663c882a0SEric Paris #include <linux/fs.h> /* struct inode */ 2763c882a0SEric Paris #include <linux/fsnotify_backend.h> 2863c882a0SEric Paris #include <linux/idr.h> 2963c882a0SEric Paris #include <linux/init.h> /* module_init */ 30272eb014SEric Paris #include <linux/inotify.h> 3163c882a0SEric Paris #include <linux/kernel.h> /* roundup() */ 3263c882a0SEric Paris #include <linux/namei.h> /* LOOKUP_FOLLOW */ 3363c882a0SEric Paris #include <linux/sched.h> /* struct user */ 3463c882a0SEric Paris #include <linux/slab.h> /* struct kmem_cache */ 35272eb014SEric Paris #include <linux/syscalls.h> 3663c882a0SEric Paris #include <linux/types.h> 37c44dcc56SAl Viro #include <linux/anon_inodes.h> 3863c882a0SEric Paris #include <linux/uaccess.h> 3963c882a0SEric Paris #include <linux/poll.h> 4063c882a0SEric Paris #include <linux/wait.h> 4163c882a0SEric Paris 4263c882a0SEric Paris #include "inotify.h" 43272eb014SEric Paris 44272eb014SEric Paris #include <asm/ioctls.h> 45272eb014SEric Paris 46272eb014SEric Paris /* these are configurable via /proc/sys/fs/inotify/ */ 47272eb014SEric Paris static int inotify_max_user_instances __read_mostly; 48272eb014SEric Paris static int inotify_max_queued_events __read_mostly; 490a24887aSH Hartley Sweeten static int inotify_max_user_watches __read_mostly; 5063c882a0SEric Paris 5163c882a0SEric Paris static struct kmem_cache *inotify_inode_mark_cachep __read_mostly; 5263c882a0SEric Paris struct kmem_cache *event_priv_cachep __read_mostly; 53272eb014SEric Paris 54272eb014SEric Paris #ifdef CONFIG_SYSCTL 55272eb014SEric Paris 56272eb014SEric Paris #include <linux/sysctl.h> 57272eb014SEric Paris 58272eb014SEric Paris static int zero; 59272eb014SEric Paris 60272eb014SEric Paris ctl_table inotify_table[] = { 61272eb014SEric Paris { 62272eb014SEric Paris .procname = "max_user_instances", 63272eb014SEric Paris .data = &inotify_max_user_instances, 64272eb014SEric Paris .maxlen = sizeof(int), 65272eb014SEric Paris .mode = 0644, 666d456111SEric W. Biederman .proc_handler = proc_dointvec_minmax, 67272eb014SEric Paris .extra1 = &zero, 68272eb014SEric Paris }, 69272eb014SEric Paris { 70272eb014SEric Paris .procname = "max_user_watches", 71272eb014SEric Paris .data = &inotify_max_user_watches, 72272eb014SEric Paris .maxlen = sizeof(int), 73272eb014SEric Paris .mode = 0644, 746d456111SEric W. Biederman .proc_handler = proc_dointvec_minmax, 75272eb014SEric Paris .extra1 = &zero, 76272eb014SEric Paris }, 77272eb014SEric Paris { 78272eb014SEric Paris .procname = "max_queued_events", 79272eb014SEric Paris .data = &inotify_max_queued_events, 80272eb014SEric Paris .maxlen = sizeof(int), 81272eb014SEric Paris .mode = 0644, 826d456111SEric W. Biederman .proc_handler = proc_dointvec_minmax, 83272eb014SEric Paris .extra1 = &zero 84272eb014SEric Paris }, 85ab09203eSEric W. Biederman { } 86272eb014SEric Paris }; 87272eb014SEric Paris #endif /* CONFIG_SYSCTL */ 88272eb014SEric Paris 8963c882a0SEric Paris static inline __u32 inotify_arg_to_mask(u32 arg) 90272eb014SEric Paris { 9163c882a0SEric Paris __u32 mask; 9263c882a0SEric Paris 93611da04fSEric Paris /* 94611da04fSEric Paris * everything should accept their own ignored, cares about children, 95611da04fSEric Paris * and should receive events when the inode is unmounted 96611da04fSEric Paris */ 97611da04fSEric Paris mask = (FS_IN_IGNORED | FS_EVENT_ON_CHILD | FS_UNMOUNT); 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 */ 112272eb014SEric Paris static unsigned int inotify_poll(struct file *file, poll_table *wait) 113272eb014SEric Paris { 11463c882a0SEric Paris struct fsnotify_group *group = file->private_data; 115272eb014SEric Paris int ret = 0; 116272eb014SEric Paris 11763c882a0SEric Paris poll_wait(file, &group->notification_waitq, wait); 11863c882a0SEric Paris mutex_lock(&group->notification_mutex); 11963c882a0SEric Paris if (!fsnotify_notify_queue_is_empty(group)) 120272eb014SEric Paris ret = POLLIN | POLLRDNORM; 12163c882a0SEric Paris mutex_unlock(&group->notification_mutex); 122272eb014SEric Paris 123272eb014SEric Paris return ret; 124272eb014SEric Paris } 125272eb014SEric Paris 1263632dee2SVegard Nossum /* 1273632dee2SVegard Nossum * Get an inotify_kernel_event if one exists and is small 1283632dee2SVegard Nossum * enough to fit in "count". Return an error pointer if 1293632dee2SVegard Nossum * not large enough. 1303632dee2SVegard Nossum * 13163c882a0SEric Paris * Called with the group->notification_mutex held. 1323632dee2SVegard Nossum */ 13363c882a0SEric Paris static struct fsnotify_event *get_one_event(struct fsnotify_group *group, 1343632dee2SVegard Nossum size_t count) 1353632dee2SVegard Nossum { 1363632dee2SVegard Nossum size_t event_size = sizeof(struct inotify_event); 13763c882a0SEric Paris struct fsnotify_event *event; 1383632dee2SVegard Nossum 13963c882a0SEric Paris if (fsnotify_notify_queue_is_empty(group)) 1403632dee2SVegard Nossum return NULL; 1413632dee2SVegard Nossum 14263c882a0SEric Paris event = fsnotify_peek_notify_event(group); 14363c882a0SEric Paris 1445ba08e2eSEric Paris pr_debug("%s: group=%p event=%p\n", __func__, group, event); 1455ba08e2eSEric Paris 14683cb10f0SEric Paris if (event->name_len) 14783cb10f0SEric Paris event_size += roundup(event->name_len + 1, event_size); 1483632dee2SVegard Nossum 1493632dee2SVegard Nossum if (event_size > count) 1503632dee2SVegard Nossum return ERR_PTR(-EINVAL); 1513632dee2SVegard Nossum 15263c882a0SEric Paris /* held the notification_mutex the whole time, so this is the 15363c882a0SEric Paris * same event we peeked above */ 15463c882a0SEric Paris fsnotify_remove_notify_event(group); 15563c882a0SEric Paris 15663c882a0SEric Paris return event; 1573632dee2SVegard Nossum } 1583632dee2SVegard Nossum 1593632dee2SVegard Nossum /* 1603632dee2SVegard Nossum * Copy an event to user space, returning how much we copied. 1613632dee2SVegard Nossum * 1623632dee2SVegard Nossum * We already checked that the event size is smaller than the 1633632dee2SVegard Nossum * buffer we had in "get_one_event()" above. 1643632dee2SVegard Nossum */ 16563c882a0SEric Paris static ssize_t copy_event_to_user(struct fsnotify_group *group, 16663c882a0SEric Paris struct fsnotify_event *event, 1673632dee2SVegard Nossum char __user *buf) 1683632dee2SVegard Nossum { 16963c882a0SEric Paris struct inotify_event inotify_event; 17063c882a0SEric Paris struct fsnotify_event_private_data *fsn_priv; 17163c882a0SEric Paris struct inotify_event_private_data *priv; 1723632dee2SVegard Nossum size_t event_size = sizeof(struct inotify_event); 173b962e731SBrian Rogers size_t name_len = 0; 1743632dee2SVegard Nossum 1755ba08e2eSEric Paris pr_debug("%s: group=%p event=%p\n", __func__, group, event); 1765ba08e2eSEric Paris 17763c882a0SEric Paris /* we get the inotify watch descriptor from the event private data */ 17863c882a0SEric Paris spin_lock(&event->lock); 17963c882a0SEric Paris fsn_priv = fsnotify_remove_priv_from_event(group, event); 18063c882a0SEric Paris spin_unlock(&event->lock); 18163c882a0SEric Paris 18263c882a0SEric Paris if (!fsn_priv) 18363c882a0SEric Paris inotify_event.wd = -1; 18463c882a0SEric Paris else { 18563c882a0SEric Paris priv = container_of(fsn_priv, struct inotify_event_private_data, 18663c882a0SEric Paris fsnotify_event_priv_data); 18763c882a0SEric Paris inotify_event.wd = priv->wd; 18863c882a0SEric Paris inotify_free_event_priv(fsn_priv); 18963c882a0SEric Paris } 19063c882a0SEric Paris 191b962e731SBrian Rogers /* 192b962e731SBrian Rogers * round up event->name_len so it is a multiple of event_size 1930db501bdSEric W. Biederman * plus an extra byte for the terminating '\0'. 1940db501bdSEric W. Biederman */ 195b962e731SBrian Rogers if (event->name_len) 1960db501bdSEric W. Biederman name_len = roundup(event->name_len + 1, event_size); 19763c882a0SEric Paris inotify_event.len = name_len; 19863c882a0SEric Paris 19963c882a0SEric Paris inotify_event.mask = inotify_mask_to_arg(event->mask); 20063c882a0SEric Paris inotify_event.cookie = event->sync_cookie; 20163c882a0SEric Paris 20263c882a0SEric Paris /* send the main event */ 20363c882a0SEric Paris if (copy_to_user(buf, &inotify_event, event_size)) 2043632dee2SVegard Nossum return -EFAULT; 2053632dee2SVegard Nossum 2063632dee2SVegard Nossum buf += event_size; 2073632dee2SVegard Nossum 20863c882a0SEric Paris /* 20963c882a0SEric Paris * fsnotify only stores the pathname, so here we have to send the pathname 21063c882a0SEric Paris * and then pad that pathname out to a multiple of sizeof(inotify_event) 21163c882a0SEric Paris * with zeros. I get my zeros from the nul_inotify_event. 21263c882a0SEric Paris */ 21363c882a0SEric Paris if (name_len) { 21463c882a0SEric Paris unsigned int len_to_zero = name_len - event->name_len; 21563c882a0SEric Paris /* copy the path name */ 21663c882a0SEric Paris if (copy_to_user(buf, event->file_name, event->name_len)) 2173632dee2SVegard Nossum return -EFAULT; 21863c882a0SEric Paris buf += event->name_len; 2193632dee2SVegard Nossum 2200db501bdSEric W. Biederman /* fill userspace with 0's */ 2210db501bdSEric W. Biederman if (clear_user(buf, len_to_zero)) 22263c882a0SEric Paris return -EFAULT; 22363c882a0SEric Paris buf += len_to_zero; 22463c882a0SEric Paris event_size += name_len; 2253632dee2SVegard Nossum } 22663c882a0SEric Paris 2273632dee2SVegard Nossum return event_size; 2283632dee2SVegard Nossum } 2293632dee2SVegard Nossum 230272eb014SEric Paris static ssize_t inotify_read(struct file *file, char __user *buf, 231272eb014SEric Paris size_t count, loff_t *pos) 232272eb014SEric Paris { 23363c882a0SEric Paris struct fsnotify_group *group; 23463c882a0SEric Paris struct fsnotify_event *kevent; 235272eb014SEric Paris char __user *start; 236272eb014SEric Paris int ret; 237272eb014SEric Paris DEFINE_WAIT(wait); 238272eb014SEric Paris 239272eb014SEric Paris start = buf; 24063c882a0SEric Paris group = file->private_data; 241272eb014SEric Paris 242272eb014SEric Paris while (1) { 24363c882a0SEric Paris prepare_to_wait(&group->notification_waitq, &wait, TASK_INTERRUPTIBLE); 244272eb014SEric Paris 24563c882a0SEric Paris mutex_lock(&group->notification_mutex); 24663c882a0SEric Paris kevent = get_one_event(group, count); 24763c882a0SEric Paris mutex_unlock(&group->notification_mutex); 248272eb014SEric Paris 2495ba08e2eSEric Paris pr_debug("%s: group=%p kevent=%p\n", __func__, group, kevent); 2505ba08e2eSEric Paris 2513632dee2SVegard Nossum if (kevent) { 2523632dee2SVegard Nossum ret = PTR_ERR(kevent); 2533632dee2SVegard Nossum if (IS_ERR(kevent)) 254272eb014SEric Paris break; 25563c882a0SEric Paris ret = copy_event_to_user(group, kevent, buf); 25663c882a0SEric Paris fsnotify_put_event(kevent); 2573632dee2SVegard Nossum if (ret < 0) 2583632dee2SVegard Nossum break; 2593632dee2SVegard Nossum buf += ret; 2603632dee2SVegard Nossum count -= ret; 2613632dee2SVegard Nossum continue; 262272eb014SEric Paris } 263272eb014SEric Paris 2643632dee2SVegard Nossum ret = -EAGAIN; 2653632dee2SVegard Nossum if (file->f_flags & O_NONBLOCK) 266272eb014SEric Paris break; 2673632dee2SVegard Nossum ret = -EINTR; 2683632dee2SVegard Nossum if (signal_pending(current)) 2693632dee2SVegard Nossum break; 2703632dee2SVegard Nossum 2713632dee2SVegard Nossum if (start != buf) 2723632dee2SVegard Nossum break; 273272eb014SEric Paris 274272eb014SEric Paris schedule(); 275272eb014SEric Paris } 276272eb014SEric Paris 27763c882a0SEric Paris finish_wait(&group->notification_waitq, &wait); 2783632dee2SVegard Nossum if (start != buf && ret != -EFAULT) 279272eb014SEric Paris ret = buf - start; 280272eb014SEric Paris return ret; 281272eb014SEric Paris } 282272eb014SEric Paris 283272eb014SEric Paris static int inotify_fasync(int fd, struct file *file, int on) 284272eb014SEric Paris { 28563c882a0SEric Paris struct fsnotify_group *group = file->private_data; 286272eb014SEric Paris 28763c882a0SEric Paris return fasync_helper(fd, file, on, &group->inotify_data.fa) >= 0 ? 0 : -EIO; 288272eb014SEric Paris } 289272eb014SEric Paris 290272eb014SEric Paris static int inotify_release(struct inode *ignored, struct file *file) 291272eb014SEric Paris { 29263c882a0SEric Paris struct fsnotify_group *group = file->private_data; 293272eb014SEric Paris 2945ba08e2eSEric Paris pr_debug("%s: group=%p\n", __func__, group); 2955ba08e2eSEric Paris 29663c882a0SEric Paris fsnotify_clear_marks_by_group(group); 297272eb014SEric Paris 29863c882a0SEric Paris /* free this group, matching get was inotify_init->fsnotify_obtain_group */ 29963c882a0SEric Paris fsnotify_put_group(group); 300272eb014SEric Paris 301272eb014SEric Paris return 0; 302272eb014SEric Paris } 303272eb014SEric Paris 304272eb014SEric Paris static long inotify_ioctl(struct file *file, unsigned int cmd, 305272eb014SEric Paris unsigned long arg) 306272eb014SEric Paris { 30763c882a0SEric Paris struct fsnotify_group *group; 30863c882a0SEric Paris struct fsnotify_event_holder *holder; 30963c882a0SEric Paris struct fsnotify_event *event; 310272eb014SEric Paris void __user *p; 311272eb014SEric Paris int ret = -ENOTTY; 31263c882a0SEric Paris size_t send_len = 0; 313272eb014SEric Paris 31463c882a0SEric Paris group = file->private_data; 315272eb014SEric Paris p = (void __user *) arg; 316272eb014SEric Paris 3175ba08e2eSEric Paris pr_debug("%s: group=%p cmd=%u\n", __func__, group, cmd); 3185ba08e2eSEric Paris 319272eb014SEric Paris switch (cmd) { 320272eb014SEric Paris case FIONREAD: 32163c882a0SEric Paris mutex_lock(&group->notification_mutex); 32263c882a0SEric Paris list_for_each_entry(holder, &group->notification_list, event_list) { 32363c882a0SEric Paris event = holder->event; 32463c882a0SEric Paris send_len += sizeof(struct inotify_event); 32583cb10f0SEric Paris if (event->name_len) 32683cb10f0SEric Paris send_len += roundup(event->name_len + 1, 32763c882a0SEric Paris sizeof(struct inotify_event)); 32863c882a0SEric Paris } 32963c882a0SEric Paris mutex_unlock(&group->notification_mutex); 33063c882a0SEric Paris ret = put_user(send_len, (int __user *) p); 331272eb014SEric Paris break; 332272eb014SEric Paris } 333272eb014SEric Paris 334272eb014SEric Paris return ret; 335272eb014SEric Paris } 336272eb014SEric Paris 337272eb014SEric Paris static const struct file_operations inotify_fops = { 338272eb014SEric Paris .poll = inotify_poll, 339272eb014SEric Paris .read = inotify_read, 340272eb014SEric Paris .fasync = inotify_fasync, 341272eb014SEric Paris .release = inotify_release, 342272eb014SEric Paris .unlocked_ioctl = inotify_ioctl, 343272eb014SEric Paris .compat_ioctl = inotify_ioctl, 3446038f373SArnd Bergmann .llseek = noop_llseek, 345272eb014SEric Paris }; 346272eb014SEric Paris 347272eb014SEric Paris 34863c882a0SEric Paris /* 34963c882a0SEric Paris * find_inode - resolve a user-given path to a specific inode 35063c882a0SEric Paris */ 35163c882a0SEric Paris static int inotify_find_inode(const char __user *dirname, struct path *path, unsigned flags) 35263c882a0SEric Paris { 35363c882a0SEric Paris int error; 35463c882a0SEric Paris 35563c882a0SEric Paris error = user_path_at(AT_FDCWD, dirname, flags, path); 35663c882a0SEric Paris if (error) 35763c882a0SEric Paris return error; 35863c882a0SEric Paris /* you can only watch an inode if you have read permissions on it */ 35963c882a0SEric Paris error = inode_permission(path->dentry->d_inode, MAY_READ); 36063c882a0SEric Paris if (error) 36163c882a0SEric Paris path_put(path); 36263c882a0SEric Paris return error; 36363c882a0SEric Paris } 36463c882a0SEric Paris 365b7ba8371SEric Paris static int inotify_add_to_idr(struct idr *idr, spinlock_t *idr_lock, 3667050c488SEric Paris int *last_wd, 367000285deSEric Paris struct inotify_inode_mark *i_mark) 368b7ba8371SEric Paris { 369b7ba8371SEric Paris int ret; 370b7ba8371SEric Paris 371b7ba8371SEric Paris do { 372b7ba8371SEric Paris if (unlikely(!idr_pre_get(idr, GFP_KERNEL))) 373b7ba8371SEric Paris return -ENOMEM; 374b7ba8371SEric Paris 375b7ba8371SEric Paris spin_lock(idr_lock); 376000285deSEric Paris ret = idr_get_new_above(idr, i_mark, *last_wd + 1, 377000285deSEric Paris &i_mark->wd); 378b7ba8371SEric Paris /* we added the mark to the idr, take a reference */ 3797050c488SEric Paris if (!ret) { 380000285deSEric Paris *last_wd = i_mark->wd; 381000285deSEric Paris fsnotify_get_mark(&i_mark->fsn_mark); 3827050c488SEric Paris } 383b7ba8371SEric Paris spin_unlock(idr_lock); 384b7ba8371SEric Paris } while (ret == -EAGAIN); 385b7ba8371SEric Paris 386b7ba8371SEric Paris return ret; 387b7ba8371SEric Paris } 388b7ba8371SEric Paris 389000285deSEric Paris static struct inotify_inode_mark *inotify_idr_find_locked(struct fsnotify_group *group, 390b7ba8371SEric Paris int wd) 391b7ba8371SEric Paris { 392b7ba8371SEric Paris struct idr *idr = &group->inotify_data.idr; 393b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 394000285deSEric Paris struct inotify_inode_mark *i_mark; 395b7ba8371SEric Paris 396b7ba8371SEric Paris assert_spin_locked(idr_lock); 397b7ba8371SEric Paris 398000285deSEric Paris i_mark = idr_find(idr, wd); 399000285deSEric Paris if (i_mark) { 400000285deSEric Paris struct fsnotify_mark *fsn_mark = &i_mark->fsn_mark; 401b7ba8371SEric Paris 402000285deSEric Paris fsnotify_get_mark(fsn_mark); 403b7ba8371SEric Paris /* One ref for being in the idr, one ref we just took */ 404000285deSEric Paris BUG_ON(atomic_read(&fsn_mark->refcnt) < 2); 405b7ba8371SEric Paris } 406b7ba8371SEric Paris 407000285deSEric Paris return i_mark; 408b7ba8371SEric Paris } 409b7ba8371SEric Paris 410000285deSEric Paris static struct inotify_inode_mark *inotify_idr_find(struct fsnotify_group *group, 411b7ba8371SEric Paris int wd) 412b7ba8371SEric Paris { 413000285deSEric Paris struct inotify_inode_mark *i_mark; 414b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 415b7ba8371SEric Paris 416b7ba8371SEric Paris spin_lock(idr_lock); 417000285deSEric Paris i_mark = inotify_idr_find_locked(group, wd); 418b7ba8371SEric Paris spin_unlock(idr_lock); 419b7ba8371SEric Paris 420000285deSEric Paris return i_mark; 421b7ba8371SEric Paris } 422b7ba8371SEric Paris 423b7ba8371SEric Paris static void do_inotify_remove_from_idr(struct fsnotify_group *group, 424000285deSEric Paris struct inotify_inode_mark *i_mark) 425b7ba8371SEric Paris { 426b7ba8371SEric Paris struct idr *idr = &group->inotify_data.idr; 427b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 428000285deSEric Paris int wd = i_mark->wd; 429b7ba8371SEric Paris 430b7ba8371SEric Paris assert_spin_locked(idr_lock); 431b7ba8371SEric Paris 432b7ba8371SEric Paris idr_remove(idr, wd); 433b7ba8371SEric Paris 434b7ba8371SEric Paris /* removed from the idr, drop that ref */ 435000285deSEric Paris fsnotify_put_mark(&i_mark->fsn_mark); 436b7ba8371SEric Paris } 437b7ba8371SEric Paris 438dead537dSEric Paris /* 439dead537dSEric Paris * Remove the mark from the idr (if present) and drop the reference 440dead537dSEric Paris * on the mark because it was in the idr. 441dead537dSEric Paris */ 4427e790dd5SEric Paris static void inotify_remove_from_idr(struct fsnotify_group *group, 443000285deSEric Paris struct inotify_inode_mark *i_mark) 4447e790dd5SEric Paris { 445b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 446000285deSEric Paris struct inotify_inode_mark *found_i_mark = NULL; 447dead537dSEric Paris int wd; 4487e790dd5SEric Paris 449b7ba8371SEric Paris spin_lock(idr_lock); 450000285deSEric Paris wd = i_mark->wd; 451dead537dSEric Paris 452b7ba8371SEric Paris /* 453000285deSEric Paris * does this i_mark think it is in the idr? we shouldn't get called 454b7ba8371SEric Paris * if it wasn't.... 455b7ba8371SEric Paris */ 456b7ba8371SEric Paris if (wd == -1) { 457000285deSEric Paris WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p" 458000285deSEric Paris " i_mark->inode=%p\n", __func__, i_mark, i_mark->wd, 459000285deSEric Paris i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode); 460dead537dSEric Paris goto out; 4617e790dd5SEric Paris } 462dead537dSEric Paris 463b7ba8371SEric Paris /* Lets look in the idr to see if we find it */ 464000285deSEric Paris found_i_mark = inotify_idr_find_locked(group, wd); 465000285deSEric Paris if (unlikely(!found_i_mark)) { 466000285deSEric Paris WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p" 467000285deSEric Paris " i_mark->inode=%p\n", __func__, i_mark, i_mark->wd, 468000285deSEric Paris i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode); 469b7ba8371SEric Paris goto out; 470b7ba8371SEric Paris } 471dead537dSEric Paris 472b7ba8371SEric Paris /* 473000285deSEric Paris * We found an mark in the idr at the right wd, but it's 474000285deSEric Paris * not the mark we were told to remove. eparis seriously 475b7ba8371SEric Paris * fucked up somewhere. 476b7ba8371SEric Paris */ 477000285deSEric Paris if (unlikely(found_i_mark != i_mark)) { 478000285deSEric Paris WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p " 479000285deSEric Paris "mark->inode=%p found_i_mark=%p found_i_mark->wd=%d " 480000285deSEric Paris "found_i_mark->group=%p found_i_mark->inode=%p\n", 481000285deSEric Paris __func__, i_mark, i_mark->wd, i_mark->fsn_mark.group, 482000285deSEric Paris i_mark->fsn_mark.i.inode, found_i_mark, found_i_mark->wd, 483000285deSEric Paris found_i_mark->fsn_mark.group, 484000285deSEric Paris found_i_mark->fsn_mark.i.inode); 485b7ba8371SEric Paris goto out; 486b7ba8371SEric Paris } 487dead537dSEric Paris 488b7ba8371SEric Paris /* 489b7ba8371SEric Paris * One ref for being in the idr 490b7ba8371SEric Paris * one ref held by the caller trying to kill us 491b7ba8371SEric Paris * one ref grabbed by inotify_idr_find 492b7ba8371SEric Paris */ 493000285deSEric Paris if (unlikely(atomic_read(&i_mark->fsn_mark.refcnt) < 3)) { 494000285deSEric Paris printk(KERN_ERR "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p" 495000285deSEric Paris " i_mark->inode=%p\n", __func__, i_mark, i_mark->wd, 496000285deSEric Paris i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode); 497b7ba8371SEric Paris /* we can't really recover with bad ref cnting.. */ 498b7ba8371SEric Paris BUG(); 499b7ba8371SEric Paris } 500b7ba8371SEric Paris 501000285deSEric Paris do_inotify_remove_from_idr(group, i_mark); 502dead537dSEric Paris out: 503b7ba8371SEric Paris /* match the ref taken by inotify_idr_find_locked() */ 504000285deSEric Paris if (found_i_mark) 505000285deSEric Paris fsnotify_put_mark(&found_i_mark->fsn_mark); 506000285deSEric Paris i_mark->wd = -1; 507b7ba8371SEric Paris spin_unlock(idr_lock); 508dead537dSEric Paris } 509dead537dSEric Paris 51063c882a0SEric Paris /* 511dead537dSEric Paris * Send IN_IGNORED for this wd, remove this wd from the idr. 51263c882a0SEric Paris */ 513000285deSEric Paris void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, 514528da3e9SEric Paris struct fsnotify_group *group) 51563c882a0SEric Paris { 516000285deSEric Paris struct inotify_inode_mark *i_mark; 517f70ab54cSEric Paris struct fsnotify_event *ignored_event, *notify_event; 51863c882a0SEric Paris struct inotify_event_private_data *event_priv; 51963c882a0SEric Paris struct fsnotify_event_private_data *fsn_event_priv; 520eef3a116SEric Paris int ret; 52163c882a0SEric Paris 522f44aebccSEric Paris ignored_event = fsnotify_create_event(NULL, FS_IN_IGNORED, NULL, 523f44aebccSEric Paris FSNOTIFY_EVENT_NONE, NULL, 0, 524f44aebccSEric Paris GFP_NOFS); 525f44aebccSEric Paris if (!ignored_event) 526f44aebccSEric Paris return; 527f44aebccSEric Paris 528000285deSEric Paris i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); 52963c882a0SEric Paris 530f44aebccSEric Paris event_priv = kmem_cache_alloc(event_priv_cachep, GFP_NOFS); 53163c882a0SEric Paris if (unlikely(!event_priv)) 53263c882a0SEric Paris goto skip_send_ignore; 53363c882a0SEric Paris 53463c882a0SEric Paris fsn_event_priv = &event_priv->fsnotify_event_priv_data; 53563c882a0SEric Paris 53663c882a0SEric Paris fsn_event_priv->group = group; 537000285deSEric Paris event_priv->wd = i_mark->wd; 53863c882a0SEric Paris 539f70ab54cSEric Paris notify_event = fsnotify_add_notify_event(group, ignored_event, fsn_event_priv, NULL); 540f70ab54cSEric Paris if (notify_event) { 541f70ab54cSEric Paris if (IS_ERR(notify_event)) 542f70ab54cSEric Paris ret = PTR_ERR(notify_event); 543f70ab54cSEric Paris else 544f70ab54cSEric Paris fsnotify_put_event(notify_event); 54563c882a0SEric Paris inotify_free_event_priv(fsn_event_priv); 546f70ab54cSEric Paris } 54763c882a0SEric Paris 54863c882a0SEric Paris skip_send_ignore: 54963c882a0SEric Paris 550f44aebccSEric Paris /* matches the reference taken when the event was created */ 551f44aebccSEric Paris fsnotify_put_event(ignored_event); 552f44aebccSEric Paris 553000285deSEric Paris /* remove this mark from the idr */ 554000285deSEric Paris inotify_remove_from_idr(group, i_mark); 55563c882a0SEric Paris 5565549f7cdSEric Paris atomic_dec(&group->inotify_data.user->inotify_watches); 55763c882a0SEric Paris } 55863c882a0SEric Paris 55963c882a0SEric Paris /* ding dong the mark is dead */ 560000285deSEric Paris static void inotify_free_mark(struct fsnotify_mark *fsn_mark) 56163c882a0SEric Paris { 562000285deSEric Paris struct inotify_inode_mark *i_mark; 56331ddd326SEric Paris 564000285deSEric Paris i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); 56563c882a0SEric Paris 566000285deSEric Paris kmem_cache_free(inotify_inode_mark_cachep, i_mark); 56763c882a0SEric Paris } 56863c882a0SEric Paris 56952cef755SEric Paris static int inotify_update_existing_watch(struct fsnotify_group *group, 57052cef755SEric Paris struct inode *inode, 57152cef755SEric Paris u32 arg) 57263c882a0SEric Paris { 573000285deSEric Paris struct fsnotify_mark *fsn_mark; 574000285deSEric Paris struct inotify_inode_mark *i_mark; 57563c882a0SEric Paris __u32 old_mask, new_mask; 57652cef755SEric Paris __u32 mask; 57752cef755SEric Paris int add = (arg & IN_MASK_ADD); 57852cef755SEric Paris int ret; 57963c882a0SEric Paris 58063c882a0SEric Paris /* don't allow invalid bits: we don't want flags set */ 58163c882a0SEric Paris mask = inotify_arg_to_mask(arg); 58244b350fcSJerome Marchand if (unlikely(!(mask & IN_ALL_EVENTS))) 58363c882a0SEric Paris return -EINVAL; 58463c882a0SEric Paris 5855444e298SEric Paris fsn_mark = fsnotify_find_inode_mark(group, inode); 586000285deSEric Paris if (!fsn_mark) 58752cef755SEric Paris return -ENOENT; 58852cef755SEric Paris 589000285deSEric Paris i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); 59075fe2b26SEric Paris 591000285deSEric Paris spin_lock(&fsn_mark->lock); 59263c882a0SEric Paris 593000285deSEric Paris old_mask = fsn_mark->mask; 59490b1e7a5SEric Paris if (add) 59590b1e7a5SEric Paris fsnotify_set_mark_mask_locked(fsn_mark, (fsn_mark->mask | mask)); 59690b1e7a5SEric Paris else 59790b1e7a5SEric Paris fsnotify_set_mark_mask_locked(fsn_mark, mask); 598000285deSEric Paris new_mask = fsn_mark->mask; 59963c882a0SEric Paris 600000285deSEric Paris spin_unlock(&fsn_mark->lock); 60163c882a0SEric Paris 60263c882a0SEric Paris if (old_mask != new_mask) { 60363c882a0SEric Paris /* more bits in old than in new? */ 60463c882a0SEric Paris int dropped = (old_mask & ~new_mask); 605000285deSEric Paris /* more bits in this fsn_mark than the inode's mask? */ 60663c882a0SEric Paris int do_inode = (new_mask & ~inode->i_fsnotify_mask); 60763c882a0SEric Paris 608000285deSEric Paris /* update the inode with this new fsn_mark */ 60963c882a0SEric Paris if (dropped || do_inode) 61063c882a0SEric Paris fsnotify_recalc_inode_mask(inode); 61163c882a0SEric Paris 61263c882a0SEric Paris } 61363c882a0SEric Paris 61452cef755SEric Paris /* return the wd */ 615000285deSEric Paris ret = i_mark->wd; 61652cef755SEric Paris 617d0775441SEric Paris /* match the get from fsnotify_find_mark() */ 618000285deSEric Paris fsnotify_put_mark(fsn_mark); 61975fe2b26SEric Paris 62052cef755SEric Paris return ret; 62163c882a0SEric Paris } 6227e790dd5SEric Paris 62352cef755SEric Paris static int inotify_new_watch(struct fsnotify_group *group, 62452cef755SEric Paris struct inode *inode, 62552cef755SEric Paris u32 arg) 62652cef755SEric Paris { 627000285deSEric Paris struct inotify_inode_mark *tmp_i_mark; 62852cef755SEric Paris __u32 mask; 62952cef755SEric Paris int ret; 630b7ba8371SEric Paris struct idr *idr = &group->inotify_data.idr; 631b7ba8371SEric Paris spinlock_t *idr_lock = &group->inotify_data.idr_lock; 63252cef755SEric Paris 63352cef755SEric Paris /* don't allow invalid bits: we don't want flags set */ 63452cef755SEric Paris mask = inotify_arg_to_mask(arg); 63544b350fcSJerome Marchand if (unlikely(!(mask & IN_ALL_EVENTS))) 63652cef755SEric Paris return -EINVAL; 63752cef755SEric Paris 638000285deSEric Paris tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL); 639000285deSEric Paris if (unlikely(!tmp_i_mark)) 64052cef755SEric Paris return -ENOMEM; 64152cef755SEric Paris 642000285deSEric Paris fsnotify_init_mark(&tmp_i_mark->fsn_mark, inotify_free_mark); 643000285deSEric Paris tmp_i_mark->fsn_mark.mask = mask; 644000285deSEric Paris tmp_i_mark->wd = -1; 64552cef755SEric Paris 64652cef755SEric Paris ret = -ENOSPC; 64752cef755SEric Paris if (atomic_read(&group->inotify_data.user->inotify_watches) >= inotify_max_user_watches) 64852cef755SEric Paris goto out_err; 649b7ba8371SEric Paris 6507050c488SEric Paris ret = inotify_add_to_idr(idr, idr_lock, &group->inotify_data.last_wd, 651000285deSEric Paris tmp_i_mark); 652b7ba8371SEric Paris if (ret) 65352cef755SEric Paris goto out_err; 65452cef755SEric Paris 65552cef755SEric Paris /* we are on the idr, now get on the inode */ 6565444e298SEric Paris ret = fsnotify_add_mark(&tmp_i_mark->fsn_mark, group, inode, NULL, 0); 65752cef755SEric Paris if (ret) { 65852cef755SEric Paris /* we failed to get on the inode, get off the idr */ 659000285deSEric Paris inotify_remove_from_idr(group, tmp_i_mark); 66052cef755SEric Paris goto out_err; 66152cef755SEric Paris } 66252cef755SEric Paris 66352cef755SEric Paris /* increment the number of watches the user has */ 66452cef755SEric Paris atomic_inc(&group->inotify_data.user->inotify_watches); 66552cef755SEric Paris 666000285deSEric Paris /* return the watch descriptor for this new mark */ 667000285deSEric Paris ret = tmp_i_mark->wd; 66852cef755SEric Paris 66952cef755SEric Paris out_err: 670000285deSEric Paris /* match the ref from fsnotify_init_mark() */ 671000285deSEric Paris fsnotify_put_mark(&tmp_i_mark->fsn_mark); 67252cef755SEric Paris 67352cef755SEric Paris return ret; 67452cef755SEric Paris } 67552cef755SEric Paris 67652cef755SEric Paris static int inotify_update_watch(struct fsnotify_group *group, struct inode *inode, u32 arg) 67752cef755SEric Paris { 67852cef755SEric Paris int ret = 0; 67952cef755SEric Paris 68052cef755SEric Paris retry: 68152cef755SEric Paris /* try to update and existing watch with the new arg */ 68252cef755SEric Paris ret = inotify_update_existing_watch(group, inode, arg); 68352cef755SEric Paris /* no mark present, try to add a new one */ 68452cef755SEric Paris if (ret == -ENOENT) 68552cef755SEric Paris ret = inotify_new_watch(group, inode, arg); 68652cef755SEric Paris /* 68752cef755SEric Paris * inotify_new_watch could race with another thread which did an 68852cef755SEric Paris * inotify_new_watch between the update_existing and the add watch 68952cef755SEric Paris * here, go back and try to update an existing mark again. 69052cef755SEric Paris */ 69152cef755SEric Paris if (ret == -EEXIST) 69252cef755SEric Paris goto retry; 69352cef755SEric Paris 69463c882a0SEric Paris return ret; 69563c882a0SEric Paris } 69663c882a0SEric Paris 697d0de4dc5SEric Paris static struct fsnotify_group *inotify_new_group(unsigned int max_events) 69863c882a0SEric Paris { 69963c882a0SEric Paris struct fsnotify_group *group; 70063c882a0SEric Paris 7010d2e2a1dSEric Paris group = fsnotify_alloc_group(&inotify_fsnotify_ops); 70263c882a0SEric Paris if (IS_ERR(group)) 70363c882a0SEric Paris return group; 70463c882a0SEric Paris 70563c882a0SEric Paris group->max_events = max_events; 70663c882a0SEric Paris 70763c882a0SEric Paris spin_lock_init(&group->inotify_data.idr_lock); 70863c882a0SEric Paris idr_init(&group->inotify_data.idr); 7099e572cc9SEric Paris group->inotify_data.last_wd = 0; 71063c882a0SEric Paris group->inotify_data.fa = NULL; 711d0de4dc5SEric Paris group->inotify_data.user = get_current_user(); 712d0de4dc5SEric Paris 713d0de4dc5SEric Paris if (atomic_inc_return(&group->inotify_data.user->inotify_devs) > 714d0de4dc5SEric Paris inotify_max_user_instances) { 715d0de4dc5SEric Paris fsnotify_put_group(group); 716d0de4dc5SEric Paris return ERR_PTR(-EMFILE); 717d0de4dc5SEric Paris } 71863c882a0SEric Paris 71963c882a0SEric Paris return group; 72063c882a0SEric Paris } 72163c882a0SEric Paris 72263c882a0SEric Paris 72363c882a0SEric Paris /* inotify syscalls */ 724938bb9f5SHeiko Carstens SYSCALL_DEFINE1(inotify_init1, int, flags) 725272eb014SEric Paris { 72663c882a0SEric Paris struct fsnotify_group *group; 727c44dcc56SAl Viro int ret; 728272eb014SEric Paris 729272eb014SEric Paris /* Check the IN_* constants for consistency. */ 730272eb014SEric Paris BUILD_BUG_ON(IN_CLOEXEC != O_CLOEXEC); 731272eb014SEric Paris BUILD_BUG_ON(IN_NONBLOCK != O_NONBLOCK); 732272eb014SEric Paris 733272eb014SEric Paris if (flags & ~(IN_CLOEXEC | IN_NONBLOCK)) 734272eb014SEric Paris return -EINVAL; 735272eb014SEric Paris 73663c882a0SEric Paris /* fsnotify_obtain_group took a reference to group, we put this when we kill the file in the end */ 737d0de4dc5SEric Paris group = inotify_new_group(inotify_max_queued_events); 738d0de4dc5SEric Paris if (IS_ERR(group)) 739d0de4dc5SEric Paris return PTR_ERR(group); 740825f9692SAl Viro 741c44dcc56SAl Viro ret = anon_inode_getfd("inotify", &inotify_fops, group, 742c44dcc56SAl Viro O_RDONLY | flags); 743d0de4dc5SEric Paris if (ret < 0) 744a2ae4cc9SEric Paris fsnotify_put_group(group); 745d0de4dc5SEric Paris 746272eb014SEric Paris return ret; 747272eb014SEric Paris } 748272eb014SEric Paris 749938bb9f5SHeiko Carstens SYSCALL_DEFINE0(inotify_init) 750272eb014SEric Paris { 751272eb014SEric Paris return sys_inotify_init1(0); 752272eb014SEric Paris } 753272eb014SEric Paris 7542e4d0924SHeiko Carstens SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, 7552e4d0924SHeiko Carstens u32, mask) 756272eb014SEric Paris { 75763c882a0SEric Paris struct fsnotify_group *group; 758272eb014SEric Paris struct inode *inode; 759272eb014SEric Paris struct path path; 760*2903ff01SAl Viro struct fd f; 761*2903ff01SAl Viro int ret; 762272eb014SEric Paris unsigned flags = 0; 763272eb014SEric Paris 764*2903ff01SAl Viro f = fdget(fd); 765*2903ff01SAl Viro if (unlikely(!f.file)) 766272eb014SEric Paris return -EBADF; 767272eb014SEric Paris 768272eb014SEric Paris /* verify that this is indeed an inotify instance */ 769*2903ff01SAl Viro if (unlikely(f.file->f_op != &inotify_fops)) { 770272eb014SEric Paris ret = -EINVAL; 771272eb014SEric Paris goto fput_and_out; 772272eb014SEric Paris } 773272eb014SEric Paris 774272eb014SEric Paris if (!(mask & IN_DONT_FOLLOW)) 775272eb014SEric Paris flags |= LOOKUP_FOLLOW; 776272eb014SEric Paris if (mask & IN_ONLYDIR) 777272eb014SEric Paris flags |= LOOKUP_DIRECTORY; 778272eb014SEric Paris 77963c882a0SEric Paris ret = inotify_find_inode(pathname, &path, flags); 78063c882a0SEric Paris if (ret) 781272eb014SEric Paris goto fput_and_out; 782272eb014SEric Paris 78363c882a0SEric Paris /* inode held in place by reference to path; group by fget on fd */ 784272eb014SEric Paris inode = path.dentry->d_inode; 785*2903ff01SAl Viro group = f.file->private_data; 786272eb014SEric Paris 78763c882a0SEric Paris /* create/update an inode mark */ 78863c882a0SEric Paris ret = inotify_update_watch(group, inode, mask); 789272eb014SEric Paris path_put(&path); 790272eb014SEric Paris fput_and_out: 791*2903ff01SAl Viro fdput(f); 792272eb014SEric Paris return ret; 793272eb014SEric Paris } 794272eb014SEric Paris 7952e4d0924SHeiko Carstens SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd) 796272eb014SEric Paris { 79763c882a0SEric Paris struct fsnotify_group *group; 798000285deSEric Paris struct inotify_inode_mark *i_mark; 799*2903ff01SAl Viro struct fd f; 800*2903ff01SAl Viro int ret = 0; 801272eb014SEric Paris 802*2903ff01SAl Viro f = fdget(fd); 803*2903ff01SAl Viro if (unlikely(!f.file)) 804272eb014SEric Paris return -EBADF; 805272eb014SEric Paris 806272eb014SEric Paris /* verify that this is indeed an inotify instance */ 807272eb014SEric Paris ret = -EINVAL; 808*2903ff01SAl Viro if (unlikely(f.file->f_op != &inotify_fops)) 809272eb014SEric Paris goto out; 810272eb014SEric Paris 811*2903ff01SAl Viro group = f.file->private_data; 812272eb014SEric Paris 81363c882a0SEric Paris ret = -EINVAL; 814000285deSEric Paris i_mark = inotify_idr_find(group, wd); 815000285deSEric Paris if (unlikely(!i_mark)) 81663c882a0SEric Paris goto out; 81763c882a0SEric Paris 818b7ba8371SEric Paris ret = 0; 819b7ba8371SEric Paris 820000285deSEric Paris fsnotify_destroy_mark(&i_mark->fsn_mark); 821b7ba8371SEric Paris 822b7ba8371SEric Paris /* match ref taken by inotify_idr_find */ 823000285deSEric Paris fsnotify_put_mark(&i_mark->fsn_mark); 824272eb014SEric Paris 825272eb014SEric Paris out: 826*2903ff01SAl Viro fdput(f); 827272eb014SEric Paris return ret; 828272eb014SEric Paris } 829272eb014SEric Paris 830272eb014SEric Paris /* 831ae0e47f0SJustin P. Mattock * inotify_user_setup - Our initialization function. Note that we cannot return 832272eb014SEric Paris * error because we have compiled-in VFS hooks. So an (unlikely) failure here 833272eb014SEric Paris * must result in panic(). 834272eb014SEric Paris */ 835272eb014SEric Paris static int __init inotify_user_setup(void) 836272eb014SEric Paris { 837f874e1acSEric Paris BUILD_BUG_ON(IN_ACCESS != FS_ACCESS); 838f874e1acSEric Paris BUILD_BUG_ON(IN_MODIFY != FS_MODIFY); 839f874e1acSEric Paris BUILD_BUG_ON(IN_ATTRIB != FS_ATTRIB); 840f874e1acSEric Paris BUILD_BUG_ON(IN_CLOSE_WRITE != FS_CLOSE_WRITE); 841f874e1acSEric Paris BUILD_BUG_ON(IN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE); 842f874e1acSEric Paris BUILD_BUG_ON(IN_OPEN != FS_OPEN); 843f874e1acSEric Paris BUILD_BUG_ON(IN_MOVED_FROM != FS_MOVED_FROM); 844f874e1acSEric Paris BUILD_BUG_ON(IN_MOVED_TO != FS_MOVED_TO); 845f874e1acSEric Paris BUILD_BUG_ON(IN_CREATE != FS_CREATE); 846f874e1acSEric Paris BUILD_BUG_ON(IN_DELETE != FS_DELETE); 847f874e1acSEric Paris BUILD_BUG_ON(IN_DELETE_SELF != FS_DELETE_SELF); 848f874e1acSEric Paris BUILD_BUG_ON(IN_MOVE_SELF != FS_MOVE_SELF); 849f874e1acSEric Paris BUILD_BUG_ON(IN_UNMOUNT != FS_UNMOUNT); 850f874e1acSEric Paris BUILD_BUG_ON(IN_Q_OVERFLOW != FS_Q_OVERFLOW); 851f874e1acSEric Paris BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED); 852f874e1acSEric Paris BUILD_BUG_ON(IN_EXCL_UNLINK != FS_EXCL_UNLINK); 853b29866aaSEric Paris BUILD_BUG_ON(IN_ISDIR != FS_ISDIR); 854f874e1acSEric Paris BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT); 855f874e1acSEric Paris 856f874e1acSEric Paris BUG_ON(hweight32(ALL_INOTIFY_BITS) != 21); 857f874e1acSEric Paris 858000285deSEric Paris inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark, SLAB_PANIC); 85963c882a0SEric Paris event_priv_cachep = KMEM_CACHE(inotify_event_private_data, SLAB_PANIC); 86063c882a0SEric Paris 861272eb014SEric Paris inotify_max_queued_events = 16384; 862272eb014SEric Paris inotify_max_user_instances = 128; 863272eb014SEric Paris inotify_max_user_watches = 8192; 864272eb014SEric Paris 865272eb014SEric Paris return 0; 866272eb014SEric Paris } 867272eb014SEric Paris module_init(inotify_user_setup); 868