Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/inotify_user.c - inotify support for userspace |
| 3 | * |
| 4 | * Authors: |
| 5 | * John McCutchan <ttb@tentacle.dhs.org> |
| 6 | * Robert Love <rml@novell.com> |
| 7 | * |
| 8 | * Copyright (C) 2005 John McCutchan |
| 9 | * Copyright 2006 Hewlett-Packard Development Company, L.P. |
| 10 | * |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 11 | * Copyright (C) 2009 Eric Paris <Red Hat Inc> |
| 12 | * inotify was largely rewriten to make use of the fsnotify infrastructure |
| 13 | * |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 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 |
| 17 | * later version. |
| 18 | * |
| 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. |
| 23 | */ |
| 24 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 25 | #include <linux/file.h> |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 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 */ |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 30 | #include <linux/inotify.h> |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 31 | #include <linux/kernel.h> /* roundup() */ |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 32 | #include <linux/namei.h> /* LOOKUP_FOLLOW */ |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 33 | #include <linux/sched.h> /* struct user */ |
| 34 | #include <linux/slab.h> /* struct kmem_cache */ |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 35 | #include <linux/syscalls.h> |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 36 | #include <linux/types.h> |
Al Viro | c44dcc5 | 2010-02-11 02:24:46 -0500 | [diff] [blame] | 37 | #include <linux/anon_inodes.h> |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 38 | #include <linux/uaccess.h> |
| 39 | #include <linux/poll.h> |
| 40 | #include <linux/wait.h> |
| 41 | |
| 42 | #include "inotify.h" |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 43 | |
| 44 | #include <asm/ioctls.h> |
| 45 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 46 | /* these are configurable via /proc/sys/fs/inotify/ */ |
Harvey Harrison | 3c828e4 | 2008-02-14 19:31:21 -0800 | [diff] [blame] | 47 | static int inotify_max_user_instances __read_mostly; |
Harvey Harrison | 3c828e4 | 2008-02-14 19:31:21 -0800 | [diff] [blame] | 48 | static int inotify_max_queued_events __read_mostly; |
H Hartley Sweeten | 0a24887 | 2010-05-14 15:35:21 -0500 | [diff] [blame] | 49 | static int inotify_max_user_watches __read_mostly; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 50 | |
| 51 | static struct kmem_cache *inotify_inode_mark_cachep __read_mostly; |
| 52 | struct kmem_cache *event_priv_cachep __read_mostly; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 53 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 54 | #ifdef CONFIG_SYSCTL |
| 55 | |
| 56 | #include <linux/sysctl.h> |
| 57 | |
| 58 | static int zero; |
| 59 | |
| 60 | ctl_table inotify_table[] = { |
| 61 | { |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 62 | .procname = "max_user_instances", |
| 63 | .data = &inotify_max_user_instances, |
| 64 | .maxlen = sizeof(int), |
| 65 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 66 | .proc_handler = proc_dointvec_minmax, |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 67 | .extra1 = &zero, |
| 68 | }, |
| 69 | { |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 70 | .procname = "max_user_watches", |
| 71 | .data = &inotify_max_user_watches, |
| 72 | .maxlen = sizeof(int), |
| 73 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 74 | .proc_handler = proc_dointvec_minmax, |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 75 | .extra1 = &zero, |
| 76 | }, |
| 77 | { |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 78 | .procname = "max_queued_events", |
| 79 | .data = &inotify_max_queued_events, |
| 80 | .maxlen = sizeof(int), |
| 81 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 82 | .proc_handler = proc_dointvec_minmax, |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 83 | .extra1 = &zero |
| 84 | }, |
Eric W. Biederman | ab09203 | 2009-11-05 14:25:10 -0800 | [diff] [blame] | 85 | { } |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 86 | }; |
| 87 | #endif /* CONFIG_SYSCTL */ |
| 88 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 89 | static inline __u32 inotify_arg_to_mask(u32 arg) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 90 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 91 | __u32 mask; |
| 92 | |
Eric Paris | 611da04 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 93 | /* |
| 94 | * everything should accept their own ignored, cares about children, |
| 95 | * and should receive events when the inode is unmounted |
| 96 | */ |
| 97 | mask = (FS_IN_IGNORED | FS_EVENT_ON_CHILD | FS_UNMOUNT); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 98 | |
| 99 | /* mask off the flags used to open the fd */ |
Eric Paris | 8c1934c | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 100 | mask |= (arg & (IN_ALL_EVENTS | IN_ONESHOT | IN_EXCL_UNLINK)); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 101 | |
| 102 | return mask; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 103 | } |
| 104 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 105 | static inline u32 inotify_mask_to_arg(__u32 mask) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 106 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 107 | return mask & (IN_ALL_EVENTS | IN_ISDIR | IN_UNMOUNT | IN_IGNORED | |
| 108 | IN_Q_OVERFLOW); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 111 | /* intofiy userspace file descriptor functions */ |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 112 | static unsigned int inotify_poll(struct file *file, poll_table *wait) |
| 113 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 114 | struct fsnotify_group *group = file->private_data; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 115 | int ret = 0; |
| 116 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 117 | poll_wait(file, &group->notification_waitq, wait); |
| 118 | mutex_lock(&group->notification_mutex); |
| 119 | if (!fsnotify_notify_queue_is_empty(group)) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 120 | ret = POLLIN | POLLRDNORM; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 121 | mutex_unlock(&group->notification_mutex); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 122 | |
| 123 | return ret; |
| 124 | } |
| 125 | |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 126 | /* |
| 127 | * Get an inotify_kernel_event if one exists and is small |
| 128 | * enough to fit in "count". Return an error pointer if |
| 129 | * not large enough. |
| 130 | * |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 131 | * Called with the group->notification_mutex held. |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 132 | */ |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 133 | static struct fsnotify_event *get_one_event(struct fsnotify_group *group, |
| 134 | size_t count) |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 135 | { |
| 136 | size_t event_size = sizeof(struct inotify_event); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 137 | struct fsnotify_event *event; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 138 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 139 | if (fsnotify_notify_queue_is_empty(group)) |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 140 | return NULL; |
| 141 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 142 | event = fsnotify_peek_notify_event(group); |
| 143 | |
Eric Paris | 5ba08e2 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 144 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); |
| 145 | |
Eric Paris | 83cb10f | 2009-08-28 11:57:55 -0400 | [diff] [blame] | 146 | if (event->name_len) |
| 147 | event_size += roundup(event->name_len + 1, event_size); |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 148 | |
| 149 | if (event_size > count) |
| 150 | return ERR_PTR(-EINVAL); |
| 151 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 152 | /* held the notification_mutex the whole time, so this is the |
| 153 | * same event we peeked above */ |
| 154 | fsnotify_remove_notify_event(group); |
| 155 | |
| 156 | return event; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Copy an event to user space, returning how much we copied. |
| 161 | * |
| 162 | * We already checked that the event size is smaller than the |
| 163 | * buffer we had in "get_one_event()" above. |
| 164 | */ |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 165 | static ssize_t copy_event_to_user(struct fsnotify_group *group, |
| 166 | struct fsnotify_event *event, |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 167 | char __user *buf) |
| 168 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 169 | struct inotify_event inotify_event; |
| 170 | struct fsnotify_event_private_data *fsn_priv; |
| 171 | struct inotify_event_private_data *priv; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 172 | size_t event_size = sizeof(struct inotify_event); |
Brian Rogers | b962e73 | 2009-08-28 10:00:05 -0400 | [diff] [blame] | 173 | size_t name_len = 0; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 174 | |
Eric Paris | 5ba08e2 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 175 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); |
| 176 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 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); |
| 181 | |
| 182 | if (!fsn_priv) |
| 183 | inotify_event.wd = -1; |
| 184 | else { |
| 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); |
| 189 | } |
| 190 | |
Brian Rogers | b962e73 | 2009-08-28 10:00:05 -0400 | [diff] [blame] | 191 | /* |
| 192 | * round up event->name_len so it is a multiple of event_size |
Eric W. Biederman | 0db501b | 2009-08-27 03:20:04 -0700 | [diff] [blame] | 193 | * plus an extra byte for the terminating '\0'. |
| 194 | */ |
Brian Rogers | b962e73 | 2009-08-28 10:00:05 -0400 | [diff] [blame] | 195 | if (event->name_len) |
| 196 | name_len = roundup(event->name_len + 1, event_size); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 197 | inotify_event.len = name_len; |
| 198 | |
| 199 | inotify_event.mask = inotify_mask_to_arg(event->mask); |
| 200 | inotify_event.cookie = event->sync_cookie; |
| 201 | |
| 202 | /* send the main event */ |
| 203 | if (copy_to_user(buf, &inotify_event, event_size)) |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 204 | return -EFAULT; |
| 205 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 206 | buf += event_size; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 207 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 208 | /* |
| 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. |
| 212 | */ |
| 213 | if (name_len) { |
| 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)) |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 217 | return -EFAULT; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 218 | buf += event->name_len; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 219 | |
Eric W. Biederman | 0db501b | 2009-08-27 03:20:04 -0700 | [diff] [blame] | 220 | /* fill userspace with 0's */ |
| 221 | if (clear_user(buf, len_to_zero)) |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 222 | return -EFAULT; |
| 223 | buf += len_to_zero; |
| 224 | event_size += name_len; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 225 | } |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 226 | |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 227 | return event_size; |
| 228 | } |
| 229 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 230 | static ssize_t inotify_read(struct file *file, char __user *buf, |
| 231 | size_t count, loff_t *pos) |
| 232 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 233 | struct fsnotify_group *group; |
| 234 | struct fsnotify_event *kevent; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 235 | char __user *start; |
| 236 | int ret; |
| 237 | DEFINE_WAIT(wait); |
| 238 | |
| 239 | start = buf; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 240 | group = file->private_data; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 241 | |
| 242 | while (1) { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 243 | prepare_to_wait(&group->notification_waitq, &wait, TASK_INTERRUPTIBLE); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 244 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 245 | mutex_lock(&group->notification_mutex); |
| 246 | kevent = get_one_event(group, count); |
| 247 | mutex_unlock(&group->notification_mutex); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 248 | |
Eric Paris | 5ba08e2 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 249 | pr_debug("%s: group=%p kevent=%p\n", __func__, group, kevent); |
| 250 | |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 251 | if (kevent) { |
| 252 | ret = PTR_ERR(kevent); |
| 253 | if (IS_ERR(kevent)) |
| 254 | break; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 255 | ret = copy_event_to_user(group, kevent, buf); |
| 256 | fsnotify_put_event(kevent); |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 257 | if (ret < 0) |
| 258 | break; |
| 259 | buf += ret; |
| 260 | count -= ret; |
| 261 | continue; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 262 | } |
| 263 | |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 264 | ret = -EAGAIN; |
| 265 | if (file->f_flags & O_NONBLOCK) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 266 | break; |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 267 | ret = -EINTR; |
| 268 | if (signal_pending(current)) |
| 269 | break; |
| 270 | |
| 271 | if (start != buf) |
| 272 | break; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 273 | |
| 274 | schedule(); |
| 275 | } |
| 276 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 277 | finish_wait(&group->notification_waitq, &wait); |
Vegard Nossum | 3632dee | 2009-01-22 15:29:45 +0100 | [diff] [blame] | 278 | if (start != buf && ret != -EFAULT) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 279 | ret = buf - start; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 280 | return ret; |
| 281 | } |
| 282 | |
Dmitry Antipov | bcfbf84 | 2008-02-06 01:36:19 -0800 | [diff] [blame] | 283 | static int inotify_fasync(int fd, struct file *file, int on) |
| 284 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 285 | struct fsnotify_group *group = file->private_data; |
Dmitry Antipov | bcfbf84 | 2008-02-06 01:36:19 -0800 | [diff] [blame] | 286 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 287 | return fasync_helper(fd, file, on, &group->inotify_data.fa) >= 0 ? 0 : -EIO; |
Dmitry Antipov | bcfbf84 | 2008-02-06 01:36:19 -0800 | [diff] [blame] | 288 | } |
| 289 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 290 | static int inotify_release(struct inode *ignored, struct file *file) |
| 291 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 292 | struct fsnotify_group *group = file->private_data; |
Keith Packard | bdae997 | 2009-07-01 21:56:38 -0700 | [diff] [blame] | 293 | struct user_struct *user = group->inotify_data.user; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 294 | |
Eric Paris | 5ba08e2 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 295 | pr_debug("%s: group=%p\n", __func__, group); |
| 296 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 297 | fsnotify_clear_marks_by_group(group); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 298 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 299 | /* free this group, matching get was inotify_init->fsnotify_obtain_group */ |
| 300 | fsnotify_put_group(group); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 301 | |
Keith Packard | bdae997 | 2009-07-01 21:56:38 -0700 | [diff] [blame] | 302 | atomic_dec(&user->inotify_devs); |
| 303 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | static long inotify_ioctl(struct file *file, unsigned int cmd, |
| 308 | unsigned long arg) |
| 309 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 310 | struct fsnotify_group *group; |
| 311 | struct fsnotify_event_holder *holder; |
| 312 | struct fsnotify_event *event; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 313 | void __user *p; |
| 314 | int ret = -ENOTTY; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 315 | size_t send_len = 0; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 316 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 317 | group = file->private_data; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 318 | p = (void __user *) arg; |
| 319 | |
Eric Paris | 5ba08e2 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 320 | pr_debug("%s: group=%p cmd=%u\n", __func__, group, cmd); |
| 321 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 322 | switch (cmd) { |
| 323 | case FIONREAD: |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 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); |
Eric Paris | 83cb10f | 2009-08-28 11:57:55 -0400 | [diff] [blame] | 328 | if (event->name_len) |
| 329 | send_len += roundup(event->name_len + 1, |
| 330 | sizeof(struct inotify_event)); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 331 | } |
| 332 | mutex_unlock(&group->notification_mutex); |
| 333 | ret = put_user(send_len, (int __user *) p); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 334 | break; |
| 335 | } |
| 336 | |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | static const struct file_operations inotify_fops = { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 341 | .poll = inotify_poll, |
| 342 | .read = inotify_read, |
| 343 | .fasync = inotify_fasync, |
| 344 | .release = inotify_release, |
| 345 | .unlocked_ioctl = inotify_ioctl, |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 346 | .compat_ioctl = inotify_ioctl, |
| 347 | }; |
| 348 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 349 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 350 | /* |
| 351 | * find_inode - resolve a user-given path to a specific inode |
| 352 | */ |
| 353 | static int inotify_find_inode(const char __user *dirname, struct path *path, unsigned flags) |
| 354 | { |
| 355 | int error; |
| 356 | |
| 357 | error = user_path_at(AT_FDCWD, dirname, flags, path); |
| 358 | if (error) |
| 359 | return error; |
| 360 | /* you can only watch an inode if you have read permissions on it */ |
| 361 | error = inode_permission(path->dentry->d_inode, MAY_READ); |
| 362 | if (error) |
| 363 | path_put(path); |
| 364 | return error; |
| 365 | } |
| 366 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 367 | static int inotify_add_to_idr(struct idr *idr, spinlock_t *idr_lock, |
Eric Paris | 7050c48 | 2009-12-17 20:27:10 -0500 | [diff] [blame] | 368 | int *last_wd, |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 369 | struct inotify_inode_mark *i_mark) |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 370 | { |
| 371 | int ret; |
| 372 | |
| 373 | do { |
| 374 | if (unlikely(!idr_pre_get(idr, GFP_KERNEL))) |
| 375 | return -ENOMEM; |
| 376 | |
| 377 | spin_lock(idr_lock); |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 378 | ret = idr_get_new_above(idr, i_mark, *last_wd + 1, |
| 379 | &i_mark->wd); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 380 | /* we added the mark to the idr, take a reference */ |
Eric Paris | 7050c48 | 2009-12-17 20:27:10 -0500 | [diff] [blame] | 381 | if (!ret) { |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 382 | *last_wd = i_mark->wd; |
| 383 | fsnotify_get_mark(&i_mark->fsn_mark); |
Eric Paris | 7050c48 | 2009-12-17 20:27:10 -0500 | [diff] [blame] | 384 | } |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 385 | spin_unlock(idr_lock); |
| 386 | } while (ret == -EAGAIN); |
| 387 | |
| 388 | return ret; |
| 389 | } |
| 390 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 391 | static struct inotify_inode_mark *inotify_idr_find_locked(struct fsnotify_group *group, |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 392 | int wd) |
| 393 | { |
| 394 | struct idr *idr = &group->inotify_data.idr; |
| 395 | spinlock_t *idr_lock = &group->inotify_data.idr_lock; |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 396 | struct inotify_inode_mark *i_mark; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 397 | |
| 398 | assert_spin_locked(idr_lock); |
| 399 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 400 | i_mark = idr_find(idr, wd); |
| 401 | if (i_mark) { |
| 402 | struct fsnotify_mark *fsn_mark = &i_mark->fsn_mark; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 403 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 404 | fsnotify_get_mark(fsn_mark); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 405 | /* One ref for being in the idr, one ref we just took */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 406 | BUG_ON(atomic_read(&fsn_mark->refcnt) < 2); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 407 | } |
| 408 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 409 | return i_mark; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 410 | } |
| 411 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 412 | static struct inotify_inode_mark *inotify_idr_find(struct fsnotify_group *group, |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 413 | int wd) |
| 414 | { |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 415 | struct inotify_inode_mark *i_mark; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 416 | spinlock_t *idr_lock = &group->inotify_data.idr_lock; |
| 417 | |
| 418 | spin_lock(idr_lock); |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 419 | i_mark = inotify_idr_find_locked(group, wd); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 420 | spin_unlock(idr_lock); |
| 421 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 422 | return i_mark; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | static void do_inotify_remove_from_idr(struct fsnotify_group *group, |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 426 | struct inotify_inode_mark *i_mark) |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 427 | { |
| 428 | struct idr *idr = &group->inotify_data.idr; |
| 429 | spinlock_t *idr_lock = &group->inotify_data.idr_lock; |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 430 | int wd = i_mark->wd; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 431 | |
| 432 | assert_spin_locked(idr_lock); |
| 433 | |
| 434 | idr_remove(idr, wd); |
| 435 | |
| 436 | /* removed from the idr, drop that ref */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 437 | fsnotify_put_mark(&i_mark->fsn_mark); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 438 | } |
| 439 | |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 440 | /* |
| 441 | * Remove the mark from the idr (if present) and drop the reference |
| 442 | * on the mark because it was in the idr. |
| 443 | */ |
Eric Paris | 7e790dd | 2009-07-07 10:28:24 -0400 | [diff] [blame] | 444 | static void inotify_remove_from_idr(struct fsnotify_group *group, |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 445 | struct inotify_inode_mark *i_mark) |
Eric Paris | 7e790dd | 2009-07-07 10:28:24 -0400 | [diff] [blame] | 446 | { |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 447 | spinlock_t *idr_lock = &group->inotify_data.idr_lock; |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 448 | struct inotify_inode_mark *found_i_mark = NULL; |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 449 | int wd; |
Eric Paris | 7e790dd | 2009-07-07 10:28:24 -0400 | [diff] [blame] | 450 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 451 | spin_lock(idr_lock); |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 452 | wd = i_mark->wd; |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 453 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 454 | /* |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 455 | * does this i_mark think it is in the idr? we shouldn't get called |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 456 | * if it wasn't.... |
| 457 | */ |
| 458 | if (wd == -1) { |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 459 | WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p" |
| 460 | " i_mark->inode=%p\n", __func__, i_mark, i_mark->wd, |
| 461 | i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode); |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 462 | goto out; |
| 463 | } |
| 464 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 465 | /* Lets look in the idr to see if we find it */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 466 | found_i_mark = inotify_idr_find_locked(group, wd); |
| 467 | if (unlikely(!found_i_mark)) { |
| 468 | WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p" |
| 469 | " i_mark->inode=%p\n", __func__, i_mark, i_mark->wd, |
| 470 | i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 471 | goto out; |
| 472 | } |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 473 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 474 | /* |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 475 | * We found an mark in the idr at the right wd, but it's |
| 476 | * not the mark we were told to remove. eparis seriously |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 477 | * fucked up somewhere. |
| 478 | */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 479 | if (unlikely(found_i_mark != i_mark)) { |
| 480 | WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p " |
| 481 | "mark->inode=%p found_i_mark=%p found_i_mark->wd=%d " |
| 482 | "found_i_mark->group=%p found_i_mark->inode=%p\n", |
| 483 | __func__, i_mark, i_mark->wd, i_mark->fsn_mark.group, |
| 484 | i_mark->fsn_mark.i.inode, found_i_mark, found_i_mark->wd, |
| 485 | found_i_mark->fsn_mark.group, |
| 486 | found_i_mark->fsn_mark.i.inode); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 487 | goto out; |
| 488 | } |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 489 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 490 | /* |
| 491 | * One ref for being in the idr |
| 492 | * one ref held by the caller trying to kill us |
| 493 | * one ref grabbed by inotify_idr_find |
| 494 | */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 495 | if (unlikely(atomic_read(&i_mark->fsn_mark.refcnt) < 3)) { |
| 496 | printk(KERN_ERR "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p" |
| 497 | " i_mark->inode=%p\n", __func__, i_mark, i_mark->wd, |
| 498 | i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 499 | /* we can't really recover with bad ref cnting.. */ |
| 500 | BUG(); |
| 501 | } |
| 502 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 503 | do_inotify_remove_from_idr(group, i_mark); |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 504 | out: |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 505 | /* match the ref taken by inotify_idr_find_locked() */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 506 | if (found_i_mark) |
| 507 | fsnotify_put_mark(&found_i_mark->fsn_mark); |
| 508 | i_mark->wd = -1; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 509 | spin_unlock(idr_lock); |
Eric Paris | 7e790dd | 2009-07-07 10:28:24 -0400 | [diff] [blame] | 510 | } |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 511 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 512 | /* |
Eric Paris | dead537 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 513 | * Send IN_IGNORED for this wd, remove this wd from the idr. |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 514 | */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 515 | void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, |
Eric Paris | 528da3e | 2009-06-12 16:04:26 -0400 | [diff] [blame] | 516 | struct fsnotify_group *group) |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 517 | { |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 518 | struct inotify_inode_mark *i_mark; |
Eric Paris | f70ab54 | 2010-07-28 10:18:37 -0400 | [diff] [blame^] | 519 | struct fsnotify_event *ignored_event, *notify_event; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 520 | struct inotify_event_private_data *event_priv; |
| 521 | struct fsnotify_event_private_data *fsn_event_priv; |
Eric Paris | eef3a11 | 2009-08-16 21:51:44 -0400 | [diff] [blame] | 522 | int ret; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 523 | |
Eric Paris | f44aebc | 2009-07-15 15:49:52 -0400 | [diff] [blame] | 524 | ignored_event = fsnotify_create_event(NULL, FS_IN_IGNORED, NULL, |
| 525 | FSNOTIFY_EVENT_NONE, NULL, 0, |
| 526 | GFP_NOFS); |
| 527 | if (!ignored_event) |
| 528 | return; |
| 529 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 530 | i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 531 | |
Eric Paris | f44aebc | 2009-07-15 15:49:52 -0400 | [diff] [blame] | 532 | event_priv = kmem_cache_alloc(event_priv_cachep, GFP_NOFS); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 533 | if (unlikely(!event_priv)) |
| 534 | goto skip_send_ignore; |
| 535 | |
| 536 | fsn_event_priv = &event_priv->fsnotify_event_priv_data; |
| 537 | |
| 538 | fsn_event_priv->group = group; |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 539 | event_priv->wd = i_mark->wd; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 540 | |
Eric Paris | f70ab54 | 2010-07-28 10:18:37 -0400 | [diff] [blame^] | 541 | notify_event = fsnotify_add_notify_event(group, ignored_event, fsn_event_priv, NULL); |
| 542 | if (notify_event) { |
| 543 | if (IS_ERR(notify_event)) |
| 544 | ret = PTR_ERR(notify_event); |
| 545 | else |
| 546 | fsnotify_put_event(notify_event); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 547 | inotify_free_event_priv(fsn_event_priv); |
Eric Paris | f70ab54 | 2010-07-28 10:18:37 -0400 | [diff] [blame^] | 548 | } |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 549 | |
| 550 | skip_send_ignore: |
| 551 | |
Eric Paris | f44aebc | 2009-07-15 15:49:52 -0400 | [diff] [blame] | 552 | /* matches the reference taken when the event was created */ |
| 553 | fsnotify_put_event(ignored_event); |
| 554 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 555 | /* remove this mark from the idr */ |
| 556 | inotify_remove_from_idr(group, i_mark); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 557 | |
Eric Paris | 5549f7c | 2009-07-07 10:28:23 -0400 | [diff] [blame] | 558 | atomic_dec(&group->inotify_data.user->inotify_watches); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | /* ding dong the mark is dead */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 562 | static void inotify_free_mark(struct fsnotify_mark *fsn_mark) |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 563 | { |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 564 | struct inotify_inode_mark *i_mark; |
Eric Paris | 31ddd32 | 2009-12-17 20:12:06 -0500 | [diff] [blame] | 565 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 566 | i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 567 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 568 | kmem_cache_free(inotify_inode_mark_cachep, i_mark); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 569 | } |
| 570 | |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 571 | static int inotify_update_existing_watch(struct fsnotify_group *group, |
| 572 | struct inode *inode, |
| 573 | u32 arg) |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 574 | { |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 575 | struct fsnotify_mark *fsn_mark; |
| 576 | struct inotify_inode_mark *i_mark; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 577 | __u32 old_mask, new_mask; |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 578 | __u32 mask; |
| 579 | int add = (arg & IN_MASK_ADD); |
| 580 | int ret; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 581 | |
| 582 | /* don't allow invalid bits: we don't want flags set */ |
| 583 | mask = inotify_arg_to_mask(arg); |
Jerome Marchand | 44b350f | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 584 | if (unlikely(!(mask & IN_ALL_EVENTS))) |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 585 | return -EINVAL; |
| 586 | |
Eric Paris | 5444e29 | 2009-12-17 21:24:27 -0500 | [diff] [blame] | 587 | fsn_mark = fsnotify_find_inode_mark(group, inode); |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 588 | if (!fsn_mark) |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 589 | return -ENOENT; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 590 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 591 | i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); |
Eric Paris | 75fe2b2 | 2009-07-07 10:28:23 -0400 | [diff] [blame] | 592 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 593 | spin_lock(&fsn_mark->lock); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 594 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 595 | old_mask = fsn_mark->mask; |
Eric Paris | 90b1e7a | 2009-12-17 21:24:33 -0500 | [diff] [blame] | 596 | if (add) |
| 597 | fsnotify_set_mark_mask_locked(fsn_mark, (fsn_mark->mask | mask)); |
| 598 | else |
| 599 | fsnotify_set_mark_mask_locked(fsn_mark, mask); |
| 600 | new_mask = fsn_mark->mask; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 601 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 602 | spin_unlock(&fsn_mark->lock); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 603 | |
| 604 | if (old_mask != new_mask) { |
| 605 | /* more bits in old than in new? */ |
| 606 | int dropped = (old_mask & ~new_mask); |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 607 | /* more bits in this fsn_mark than the inode's mask? */ |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 608 | int do_inode = (new_mask & ~inode->i_fsnotify_mask); |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 609 | /* more bits in this fsn_mark than the group? */ |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 610 | int do_group = (new_mask & ~group->mask); |
| 611 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 612 | /* update the inode with this new fsn_mark */ |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 613 | if (dropped || do_inode) |
| 614 | fsnotify_recalc_inode_mask(inode); |
| 615 | |
| 616 | /* update the group mask with the new mask */ |
| 617 | if (dropped || do_group) |
| 618 | fsnotify_recalc_group_mask(group); |
| 619 | } |
| 620 | |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 621 | /* return the wd */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 622 | ret = i_mark->wd; |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 623 | |
Eric Paris | d077544 | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 624 | /* match the get from fsnotify_find_mark() */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 625 | fsnotify_put_mark(fsn_mark); |
Eric Paris | 75fe2b2 | 2009-07-07 10:28:23 -0400 | [diff] [blame] | 626 | |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 627 | return ret; |
| 628 | } |
| 629 | |
| 630 | static int inotify_new_watch(struct fsnotify_group *group, |
| 631 | struct inode *inode, |
| 632 | u32 arg) |
| 633 | { |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 634 | struct inotify_inode_mark *tmp_i_mark; |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 635 | __u32 mask; |
| 636 | int ret; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 637 | struct idr *idr = &group->inotify_data.idr; |
| 638 | spinlock_t *idr_lock = &group->inotify_data.idr_lock; |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 639 | |
| 640 | /* don't allow invalid bits: we don't want flags set */ |
| 641 | mask = inotify_arg_to_mask(arg); |
Jerome Marchand | 44b350f | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 642 | if (unlikely(!(mask & IN_ALL_EVENTS))) |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 643 | return -EINVAL; |
| 644 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 645 | tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL); |
| 646 | if (unlikely(!tmp_i_mark)) |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 647 | return -ENOMEM; |
| 648 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 649 | fsnotify_init_mark(&tmp_i_mark->fsn_mark, inotify_free_mark); |
| 650 | tmp_i_mark->fsn_mark.mask = mask; |
| 651 | tmp_i_mark->wd = -1; |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 652 | |
| 653 | ret = -ENOSPC; |
| 654 | if (atomic_read(&group->inotify_data.user->inotify_watches) >= inotify_max_user_watches) |
| 655 | goto out_err; |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 656 | |
Eric Paris | 7050c48 | 2009-12-17 20:27:10 -0500 | [diff] [blame] | 657 | ret = inotify_add_to_idr(idr, idr_lock, &group->inotify_data.last_wd, |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 658 | tmp_i_mark); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 659 | if (ret) |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 660 | goto out_err; |
| 661 | |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 662 | /* we are on the idr, now get on the inode */ |
Eric Paris | 5444e29 | 2009-12-17 21:24:27 -0500 | [diff] [blame] | 663 | ret = fsnotify_add_mark(&tmp_i_mark->fsn_mark, group, inode, NULL, 0); |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 664 | if (ret) { |
| 665 | /* we failed to get on the inode, get off the idr */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 666 | inotify_remove_from_idr(group, tmp_i_mark); |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 667 | goto out_err; |
| 668 | } |
| 669 | |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 670 | /* increment the number of watches the user has */ |
| 671 | atomic_inc(&group->inotify_data.user->inotify_watches); |
| 672 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 673 | /* return the watch descriptor for this new mark */ |
| 674 | ret = tmp_i_mark->wd; |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 675 | |
Eric Paris | 750a887 | 2009-08-28 12:50:47 -0400 | [diff] [blame] | 676 | /* if this mark added a new event update the group mask */ |
| 677 | if (mask & ~group->mask) |
| 678 | fsnotify_recalc_group_mask(group); |
| 679 | |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 680 | out_err: |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 681 | /* match the ref from fsnotify_init_mark() */ |
| 682 | fsnotify_put_mark(&tmp_i_mark->fsn_mark); |
Eric Paris | 52cef75 | 2009-08-24 16:03:35 -0400 | [diff] [blame] | 683 | |
| 684 | return ret; |
| 685 | } |
| 686 | |
| 687 | static int inotify_update_watch(struct fsnotify_group *group, struct inode *inode, u32 arg) |
| 688 | { |
| 689 | int ret = 0; |
| 690 | |
| 691 | retry: |
| 692 | /* try to update and existing watch with the new arg */ |
| 693 | ret = inotify_update_existing_watch(group, inode, arg); |
| 694 | /* no mark present, try to add a new one */ |
| 695 | if (ret == -ENOENT) |
| 696 | ret = inotify_new_watch(group, inode, arg); |
| 697 | /* |
| 698 | * inotify_new_watch could race with another thread which did an |
| 699 | * inotify_new_watch between the update_existing and the add watch |
| 700 | * here, go back and try to update an existing mark again. |
| 701 | */ |
| 702 | if (ret == -EEXIST) |
| 703 | goto retry; |
| 704 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 705 | return ret; |
| 706 | } |
| 707 | |
| 708 | static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsigned int max_events) |
| 709 | { |
| 710 | struct fsnotify_group *group; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 711 | |
Eric Paris | 0d2e2a1 | 2009-12-17 21:24:22 -0500 | [diff] [blame] | 712 | group = fsnotify_alloc_group(&inotify_fsnotify_ops); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 713 | if (IS_ERR(group)) |
| 714 | return group; |
| 715 | |
| 716 | group->max_events = max_events; |
| 717 | |
| 718 | spin_lock_init(&group->inotify_data.idr_lock); |
| 719 | idr_init(&group->inotify_data.idr); |
Eric Paris | 9e572cc | 2010-01-15 12:12:24 -0500 | [diff] [blame] | 720 | group->inotify_data.last_wd = 0; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 721 | group->inotify_data.user = user; |
| 722 | group->inotify_data.fa = NULL; |
| 723 | |
| 724 | return group; |
| 725 | } |
| 726 | |
| 727 | |
| 728 | /* inotify syscalls */ |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 729 | SYSCALL_DEFINE1(inotify_init1, int, flags) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 730 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 731 | struct fsnotify_group *group; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 732 | struct user_struct *user; |
Al Viro | c44dcc5 | 2010-02-11 02:24:46 -0500 | [diff] [blame] | 733 | int ret; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 734 | |
Ulrich Drepper | e38b36f | 2008-07-23 21:29:42 -0700 | [diff] [blame] | 735 | /* Check the IN_* constants for consistency. */ |
| 736 | BUILD_BUG_ON(IN_CLOEXEC != O_CLOEXEC); |
| 737 | BUILD_BUG_ON(IN_NONBLOCK != O_NONBLOCK); |
| 738 | |
Ulrich Drepper | 510df2d | 2008-07-23 21:29:41 -0700 | [diff] [blame] | 739 | if (flags & ~(IN_CLOEXEC | IN_NONBLOCK)) |
Ulrich Drepper | 4006553 | 2008-07-23 21:29:32 -0700 | [diff] [blame] | 740 | return -EINVAL; |
| 741 | |
David Howells | da9592e | 2008-11-14 10:39:05 +1100 | [diff] [blame] | 742 | user = get_current_user(); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 743 | if (unlikely(atomic_read(&user->inotify_devs) >= |
| 744 | inotify_max_user_instances)) { |
| 745 | ret = -EMFILE; |
| 746 | goto out_free_uid; |
| 747 | } |
| 748 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 749 | /* fsnotify_obtain_group took a reference to group, we put this when we kill the file in the end */ |
| 750 | group = inotify_new_group(user, inotify_max_queued_events); |
| 751 | if (IS_ERR(group)) { |
| 752 | ret = PTR_ERR(group); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 753 | goto out_free_uid; |
| 754 | } |
| 755 | |
Al Viro | 825f969 | 2009-08-05 18:35:21 +0400 | [diff] [blame] | 756 | atomic_inc(&user->inotify_devs); |
| 757 | |
Al Viro | c44dcc5 | 2010-02-11 02:24:46 -0500 | [diff] [blame] | 758 | ret = anon_inode_getfd("inotify", &inotify_fops, group, |
| 759 | O_RDONLY | flags); |
| 760 | if (ret >= 0) |
| 761 | return ret; |
Al Viro | 825f969 | 2009-08-05 18:35:21 +0400 | [diff] [blame] | 762 | |
Al Viro | 825f969 | 2009-08-05 18:35:21 +0400 | [diff] [blame] | 763 | atomic_dec(&user->inotify_devs); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 764 | out_free_uid: |
| 765 | free_uid(user); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 766 | return ret; |
| 767 | } |
| 768 | |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 769 | SYSCALL_DEFINE0(inotify_init) |
Ulrich Drepper | 4006553 | 2008-07-23 21:29:32 -0700 | [diff] [blame] | 770 | { |
| 771 | return sys_inotify_init1(0); |
| 772 | } |
| 773 | |
Heiko Carstens | 2e4d092 | 2009-01-14 14:14:31 +0100 | [diff] [blame] | 774 | SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, |
| 775 | u32, mask) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 776 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 777 | struct fsnotify_group *group; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 778 | struct inode *inode; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 779 | struct path path; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 780 | struct file *filp; |
| 781 | int ret, fput_needed; |
| 782 | unsigned flags = 0; |
| 783 | |
| 784 | filp = fget_light(fd, &fput_needed); |
| 785 | if (unlikely(!filp)) |
| 786 | return -EBADF; |
| 787 | |
| 788 | /* verify that this is indeed an inotify instance */ |
| 789 | if (unlikely(filp->f_op != &inotify_fops)) { |
| 790 | ret = -EINVAL; |
| 791 | goto fput_and_out; |
| 792 | } |
| 793 | |
| 794 | if (!(mask & IN_DONT_FOLLOW)) |
| 795 | flags |= LOOKUP_FOLLOW; |
| 796 | if (mask & IN_ONLYDIR) |
| 797 | flags |= LOOKUP_DIRECTORY; |
| 798 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 799 | ret = inotify_find_inode(pathname, &path, flags); |
| 800 | if (ret) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 801 | goto fput_and_out; |
| 802 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 803 | /* inode held in place by reference to path; group by fget on fd */ |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 804 | inode = path.dentry->d_inode; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 805 | group = filp->private_data; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 806 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 807 | /* create/update an inode mark */ |
| 808 | ret = inotify_update_watch(group, inode, mask); |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 809 | path_put(&path); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 810 | fput_and_out: |
| 811 | fput_light(filp, fput_needed); |
| 812 | return ret; |
| 813 | } |
| 814 | |
Heiko Carstens | 2e4d092 | 2009-01-14 14:14:31 +0100 | [diff] [blame] | 815 | SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 816 | { |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 817 | struct fsnotify_group *group; |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 818 | struct inotify_inode_mark *i_mark; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 819 | struct file *filp; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 820 | int ret = 0, fput_needed; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 821 | |
| 822 | filp = fget_light(fd, &fput_needed); |
| 823 | if (unlikely(!filp)) |
| 824 | return -EBADF; |
| 825 | |
| 826 | /* verify that this is indeed an inotify instance */ |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 827 | ret = -EINVAL; |
| 828 | if (unlikely(filp->f_op != &inotify_fops)) |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 829 | goto out; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 830 | |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 831 | group = filp->private_data; |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 832 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 833 | ret = -EINVAL; |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 834 | i_mark = inotify_idr_find(group, wd); |
| 835 | if (unlikely(!i_mark)) |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 836 | goto out; |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 837 | |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 838 | ret = 0; |
| 839 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 840 | fsnotify_destroy_mark(&i_mark->fsn_mark); |
Eric Paris | b7ba837 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 841 | |
| 842 | /* match ref taken by inotify_idr_find */ |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 843 | fsnotify_put_mark(&i_mark->fsn_mark); |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 844 | |
| 845 | out: |
| 846 | fput_light(filp, fput_needed); |
| 847 | return ret; |
| 848 | } |
| 849 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 850 | /* |
| 851 | * inotify_user_setup - Our initialization function. Note that we cannnot return |
| 852 | * error because we have compiled-in VFS hooks. So an (unlikely) failure here |
| 853 | * must result in panic(). |
| 854 | */ |
| 855 | static int __init inotify_user_setup(void) |
| 856 | { |
Eric Paris | f874e1a | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 857 | BUILD_BUG_ON(IN_ACCESS != FS_ACCESS); |
| 858 | BUILD_BUG_ON(IN_MODIFY != FS_MODIFY); |
| 859 | BUILD_BUG_ON(IN_ATTRIB != FS_ATTRIB); |
| 860 | BUILD_BUG_ON(IN_CLOSE_WRITE != FS_CLOSE_WRITE); |
| 861 | BUILD_BUG_ON(IN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE); |
| 862 | BUILD_BUG_ON(IN_OPEN != FS_OPEN); |
| 863 | BUILD_BUG_ON(IN_MOVED_FROM != FS_MOVED_FROM); |
| 864 | BUILD_BUG_ON(IN_MOVED_TO != FS_MOVED_TO); |
| 865 | BUILD_BUG_ON(IN_CREATE != FS_CREATE); |
| 866 | BUILD_BUG_ON(IN_DELETE != FS_DELETE); |
| 867 | BUILD_BUG_ON(IN_DELETE_SELF != FS_DELETE_SELF); |
| 868 | BUILD_BUG_ON(IN_MOVE_SELF != FS_MOVE_SELF); |
| 869 | BUILD_BUG_ON(IN_UNMOUNT != FS_UNMOUNT); |
| 870 | BUILD_BUG_ON(IN_Q_OVERFLOW != FS_Q_OVERFLOW); |
| 871 | BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED); |
| 872 | BUILD_BUG_ON(IN_EXCL_UNLINK != FS_EXCL_UNLINK); |
| 873 | BUILD_BUG_ON(IN_ISDIR != FS_IN_ISDIR); |
| 874 | BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT); |
| 875 | |
| 876 | BUG_ON(hweight32(ALL_INOTIFY_BITS) != 21); |
| 877 | |
Eric Paris | 000285d | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 878 | inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark, SLAB_PANIC); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 879 | event_priv_cachep = KMEM_CACHE(inotify_event_private_data, SLAB_PANIC); |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 880 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 881 | inotify_max_queued_events = 16384; |
| 882 | inotify_max_user_instances = 128; |
| 883 | inotify_max_user_watches = 8192; |
| 884 | |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 885 | return 0; |
| 886 | } |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 887 | module_init(inotify_user_setup); |