Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2, or (at your option) |
| 7 | * any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; see the file COPYING. If not, write to |
| 16 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/dcache.h> |
| 20 | #include <linux/fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/gfp.h> |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 22 | #include <linux/init.h> |
| 23 | #include <linux/module.h> |
Eric Paris | 7131485 | 2009-12-17 21:24:23 -0500 | [diff] [blame] | 24 | #include <linux/mount.h> |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 25 | #include <linux/srcu.h> |
| 26 | |
| 27 | #include <linux/fsnotify_backend.h> |
| 28 | #include "fsnotify.h" |
| 29 | |
| 30 | /* |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 31 | * Clear all of the marks on an inode when it is being evicted from core |
| 32 | */ |
| 33 | void __fsnotify_inode_delete(struct inode *inode) |
| 34 | { |
| 35 | fsnotify_clear_marks_by_inode(inode); |
| 36 | } |
| 37 | EXPORT_SYMBOL_GPL(__fsnotify_inode_delete); |
| 38 | |
Andreas Gruenbacher | ca9c726 | 2009-12-17 21:24:27 -0500 | [diff] [blame] | 39 | void __fsnotify_vfsmount_delete(struct vfsmount *mnt) |
| 40 | { |
| 41 | fsnotify_clear_marks_by_mount(mnt); |
| 42 | } |
| 43 | |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 44 | /* |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 45 | * Given an inode, first check if we care what happens to our children. Inotify |
| 46 | * and dnotify both tell their parents about events. If we care about any event |
| 47 | * on a child we run all of our children and set a dentry flag saying that the |
| 48 | * parent cares. Thus when an event happens on a child it can quickly tell if |
| 49 | * if there is a need to find a parent and send the event to the parent. |
| 50 | */ |
| 51 | void __fsnotify_update_child_dentry_flags(struct inode *inode) |
| 52 | { |
| 53 | struct dentry *alias; |
| 54 | int watched; |
| 55 | |
| 56 | if (!S_ISDIR(inode->i_mode)) |
| 57 | return; |
| 58 | |
| 59 | /* determine if the children should tell inode about their events */ |
| 60 | watched = fsnotify_inode_watches_children(inode); |
| 61 | |
Nick Piggin | 873feea | 2011-01-07 17:50:06 +1100 | [diff] [blame] | 62 | spin_lock(&inode->i_lock); |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 63 | /* run all of the dentries associated with this inode. Since this is a |
| 64 | * directory, there damn well better only be one item on this list */ |
Al Viro | 946e51f | 2014-10-26 19:19:16 -0400 | [diff] [blame] | 65 | hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 66 | struct dentry *child; |
| 67 | |
| 68 | /* run all of the children of the original inode and fix their |
| 69 | * d_flags to indicate parental interest (their parent is the |
| 70 | * original inode) */ |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 71 | spin_lock(&alias->d_lock); |
Al Viro | 946e51f | 2014-10-26 19:19:16 -0400 | [diff] [blame] | 72 | list_for_each_entry(child, &alias->d_subdirs, d_child) { |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 73 | if (!child->d_inode) |
| 74 | continue; |
| 75 | |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 76 | spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 77 | if (watched) |
| 78 | child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; |
| 79 | else |
| 80 | child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; |
| 81 | spin_unlock(&child->d_lock); |
| 82 | } |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 83 | spin_unlock(&alias->d_lock); |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 84 | } |
Nick Piggin | 873feea | 2011-01-07 17:50:06 +1100 | [diff] [blame] | 85 | spin_unlock(&inode->i_lock); |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | /* Notify this dentry's parent about a child's events. */ |
Eric Paris | 5242039 | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 89 | int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask) |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 90 | { |
| 91 | struct dentry *parent; |
| 92 | struct inode *p_inode; |
Eric Paris | 5242039 | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 93 | int ret = 0; |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 94 | |
Andreas Gruenbacher | 72acc85 | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 95 | if (!dentry) |
Linus Torvalds | 2069601 | 2010-08-12 14:23:04 -0700 | [diff] [blame] | 96 | dentry = path->dentry; |
Eric Paris | 28c60e3 | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 97 | |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 98 | if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED)) |
Eric Paris | 5242039 | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 99 | return 0; |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 100 | |
Christoph Hellwig | 4d4eb36 | 2010-10-10 05:36:30 -0400 | [diff] [blame] | 101 | parent = dget_parent(dentry); |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 102 | p_inode = parent->d_inode; |
| 103 | |
Amir Goldstein | 987d8ff | 2018-10-30 20:29:53 +0200 | [diff] [blame] | 104 | if (unlikely(!fsnotify_inode_watches_children(p_inode))) { |
Christoph Hellwig | 4d4eb36 | 2010-10-10 05:36:30 -0400 | [diff] [blame] | 105 | __fsnotify_update_child_dentry_flags(p_inode); |
Amir Goldstein | 987d8ff | 2018-10-30 20:29:53 +0200 | [diff] [blame] | 106 | } else if (p_inode->i_fsnotify_mask & mask & ~FS_EVENT_ON_CHILD) { |
Al Viro | ad25f11 | 2017-07-07 14:51:19 -0400 | [diff] [blame] | 107 | struct name_snapshot name; |
| 108 | |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 109 | /* we are notifying a parent so come up with the new mask which |
| 110 | * specifies these are events which came from a child. */ |
| 111 | mask |= FS_EVENT_ON_CHILD; |
| 112 | |
Al Viro | ad25f11 | 2017-07-07 14:51:19 -0400 | [diff] [blame] | 113 | take_dentry_name_snapshot(&name, dentry); |
Linus Torvalds | 2069601 | 2010-08-12 14:23:04 -0700 | [diff] [blame] | 114 | if (path) |
Eric Paris | 5242039 | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 115 | ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH, |
Al Viro | ad25f11 | 2017-07-07 14:51:19 -0400 | [diff] [blame] | 116 | name.name, 0); |
Eric Paris | 28c60e3 | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 117 | else |
Eric Paris | 5242039 | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 118 | ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE, |
Al Viro | ad25f11 | 2017-07-07 14:51:19 -0400 | [diff] [blame] | 119 | name.name, 0); |
| 120 | release_dentry_name_snapshot(&name); |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 121 | } |
| 122 | |
Christoph Hellwig | 4d4eb36 | 2010-10-10 05:36:30 -0400 | [diff] [blame] | 123 | dput(parent); |
Eric Paris | 5242039 | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 124 | |
| 125 | return ret; |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 126 | } |
| 127 | EXPORT_SYMBOL_GPL(__fsnotify_parent); |
| 128 | |
Dan Carpenter | fd65717 | 2012-05-29 11:02:24 -0700 | [diff] [blame] | 129 | static int send_to_group(struct inode *to_tell, |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 130 | struct fsnotify_mark *inode_mark, |
| 131 | struct fsnotify_mark *vfsmount_mark, |
| 132 | __u32 mask, void *data, |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 133 | int data_is, u32 cookie, |
Jan Kara | 7053aee | 2014-01-21 15:48:14 -0800 | [diff] [blame] | 134 | const unsigned char *file_name) |
Eric Paris | 7131485 | 2009-12-17 21:24:23 -0500 | [diff] [blame] | 135 | { |
Eric Paris | faa9560 | 2010-08-18 12:25:49 -0400 | [diff] [blame] | 136 | struct fsnotify_group *group = NULL; |
Eric Paris | 84e1ab4 | 2010-08-18 12:25:50 -0400 | [diff] [blame] | 137 | __u32 inode_test_mask = 0; |
| 138 | __u32 vfsmount_test_mask = 0; |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 139 | |
Eric Paris | faa9560 | 2010-08-18 12:25:49 -0400 | [diff] [blame] | 140 | if (unlikely(!inode_mark && !vfsmount_mark)) { |
| 141 | BUG(); |
| 142 | return 0; |
| 143 | } |
Eric Paris | 5ba08e2 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 144 | |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 145 | /* clear ignored on inode modification */ |
| 146 | if (mask & FS_MODIFY) { |
| 147 | if (inode_mark && |
| 148 | !(inode_mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)) |
| 149 | inode_mark->ignored_mask = 0; |
| 150 | if (vfsmount_mark && |
| 151 | !(vfsmount_mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)) |
| 152 | vfsmount_mark->ignored_mask = 0; |
| 153 | } |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 154 | |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 155 | /* does the inode mark tell us to do something? */ |
| 156 | if (inode_mark) { |
Eric Paris | faa9560 | 2010-08-18 12:25:49 -0400 | [diff] [blame] | 157 | group = inode_mark->group; |
Eric Paris | 84e1ab4 | 2010-08-18 12:25:50 -0400 | [diff] [blame] | 158 | inode_test_mask = (mask & ~FS_EVENT_ON_CHILD); |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 159 | inode_test_mask &= inode_mark->mask; |
| 160 | inode_test_mask &= ~inode_mark->ignored_mask; |
| 161 | } |
| 162 | |
| 163 | /* does the vfsmount_mark tell us to do something? */ |
| 164 | if (vfsmount_mark) { |
Eric Paris | 84e1ab4 | 2010-08-18 12:25:50 -0400 | [diff] [blame] | 165 | vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD); |
Eric Paris | faa9560 | 2010-08-18 12:25:49 -0400 | [diff] [blame] | 166 | group = vfsmount_mark->group; |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 167 | vfsmount_test_mask &= vfsmount_mark->mask; |
| 168 | vfsmount_test_mask &= ~vfsmount_mark->ignored_mask; |
| 169 | if (inode_mark) |
| 170 | vfsmount_test_mask &= ~inode_mark->ignored_mask; |
| 171 | } |
| 172 | |
Dan Carpenter | fd65717 | 2012-05-29 11:02:24 -0700 | [diff] [blame] | 173 | pr_debug("%s: group=%p to_tell=%p mask=%x inode_mark=%p" |
Eric Paris | 84e1ab4 | 2010-08-18 12:25:50 -0400 | [diff] [blame] | 174 | " inode_test_mask=%x vfsmount_mark=%p vfsmount_test_mask=%x" |
Jan Kara | 7053aee | 2014-01-21 15:48:14 -0800 | [diff] [blame] | 175 | " data=%p data_is=%d cookie=%d\n", |
Dan Carpenter | fd65717 | 2012-05-29 11:02:24 -0700 | [diff] [blame] | 176 | __func__, group, to_tell, mask, inode_mark, |
Eric Paris | 84e1ab4 | 2010-08-18 12:25:50 -0400 | [diff] [blame] | 177 | inode_test_mask, vfsmount_mark, vfsmount_test_mask, data, |
Jan Kara | 7053aee | 2014-01-21 15:48:14 -0800 | [diff] [blame] | 178 | data_is, cookie); |
Eric Paris | faa9560 | 2010-08-18 12:25:49 -0400 | [diff] [blame] | 179 | |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 180 | if (!inode_test_mask && !vfsmount_test_mask) |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 181 | return 0; |
| 182 | |
Jan Kara | 7053aee | 2014-01-21 15:48:14 -0800 | [diff] [blame] | 183 | return group->ops->handle_event(group, to_tell, inode_mark, |
| 184 | vfsmount_mark, mask, data, data_is, |
Jan Kara | 45a22f4 | 2014-02-17 13:09:50 +0100 | [diff] [blame] | 185 | file_name, cookie); |
Eric Paris | 7131485 | 2009-12-17 21:24:23 -0500 | [diff] [blame] | 186 | } |
| 187 | |
Eric Paris | c28f7e5 | 2009-05-21 17:01:29 -0400 | [diff] [blame] | 188 | /* |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 189 | * This is the main call to fsnotify. The VFS calls into hook specific functions |
| 190 | * in linux/fsnotify.h. Those functions then in turn call here. Here will call |
| 191 | * out to all of the registered fsnotify_group. Those groups can then use the |
| 192 | * notification event in whatever means they feel necessary. |
| 193 | */ |
Eric Paris | c4ec54b | 2009-12-17 21:24:34 -0500 | [diff] [blame] | 194 | int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, |
| 195 | const unsigned char *file_name, u32 cookie) |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 196 | { |
Eric Paris | 84e1ab4 | 2010-08-18 12:25:50 -0400 | [diff] [blame] | 197 | struct hlist_node *inode_node = NULL, *vfsmount_node = NULL; |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 198 | struct fsnotify_mark *inode_mark = NULL, *vfsmount_mark = NULL; |
| 199 | struct fsnotify_group *inode_group, *vfsmount_group; |
Al Viro | c63181e | 2011-11-25 02:35:16 -0500 | [diff] [blame] | 200 | struct mount *mnt; |
Eric Paris | c4ec54b | 2009-12-17 21:24:34 -0500 | [diff] [blame] | 201 | int idx, ret = 0; |
Eric Paris | e42e277 | 2009-06-11 11:09:47 -0400 | [diff] [blame] | 202 | /* global tests shouldn't care about events on child only the specific event */ |
| 203 | __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD); |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 204 | |
Linus Torvalds | 2069601 | 2010-08-12 14:23:04 -0700 | [diff] [blame] | 205 | if (data_is == FSNOTIFY_EVENT_PATH) |
Al Viro | c63181e | 2011-11-25 02:35:16 -0500 | [diff] [blame] | 206 | mnt = real_mount(((struct path *)data)->mnt); |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 207 | else |
| 208 | mnt = NULL; |
| 209 | |
Amir Goldstein | 987d8ff | 2018-10-30 20:29:53 +0200 | [diff] [blame] | 210 | /* An event "on child" is not intended for a mount mark */ |
| 211 | if (mask & FS_EVENT_ON_CHILD) |
| 212 | mnt = NULL; |
| 213 | |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 214 | /* |
Dave Hansen | 7c49b86 | 2015-09-04 15:43:01 -0700 | [diff] [blame] | 215 | * Optimization: srcu_read_lock() has a memory barrier which can |
| 216 | * be expensive. It protects walking the *_fsnotify_marks lists. |
| 217 | * However, if we do not walk the lists, we do not have to do |
| 218 | * SRCU because we have no references to any objects and do not |
| 219 | * need SRCU to keep them "alive". |
| 220 | */ |
| 221 | if (hlist_empty(&to_tell->i_fsnotify_marks) && |
| 222 | (!mnt || hlist_empty(&mnt->mnt_fsnotify_marks))) |
| 223 | return 0; |
| 224 | /* |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 225 | * if this is a modify event we may need to clear the ignored masks |
| 226 | * otherwise return if neither the inode nor the vfsmount care about |
| 227 | * this type of event. |
| 228 | */ |
| 229 | if (!(mask & FS_MODIFY) && |
| 230 | !(test_mask & to_tell->i_fsnotify_mask) && |
| 231 | !(mnt && test_mask & mnt->mnt_fsnotify_mask)) |
| 232 | return 0; |
Eric Paris | 3a9fb89 | 2009-12-17 21:24:23 -0500 | [diff] [blame] | 233 | |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 234 | idx = srcu_read_lock(&fsnotify_mark_srcu); |
Eric Paris | 7131485 | 2009-12-17 21:24:23 -0500 | [diff] [blame] | 235 | |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 236 | if ((mask & FS_MODIFY) || |
| 237 | (test_mask & to_tell->i_fsnotify_mask)) |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 238 | inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first, |
| 239 | &fsnotify_mark_srcu); |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 240 | |
Eric Paris | 84e1ab4 | 2010-08-18 12:25:50 -0400 | [diff] [blame] | 241 | if (mnt && ((mask & FS_MODIFY) || |
| 242 | (test_mask & mnt->mnt_fsnotify_mask))) { |
| 243 | vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first, |
| 244 | &fsnotify_mark_srcu); |
| 245 | inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first, |
| 246 | &fsnotify_mark_srcu); |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 247 | } |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 248 | |
Jan Kara | 8edc6e1 | 2014-11-13 15:19:33 -0800 | [diff] [blame] | 249 | /* |
| 250 | * We need to merge inode & vfsmount mark lists so that inode mark |
| 251 | * ignore masks are properly reflected for mount mark notifications. |
| 252 | * That's why this traversal is so complicated... |
| 253 | */ |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 254 | while (inode_node || vfsmount_node) { |
Jan Kara | 8edc6e1 | 2014-11-13 15:19:33 -0800 | [diff] [blame] | 255 | inode_group = NULL; |
| 256 | inode_mark = NULL; |
| 257 | vfsmount_group = NULL; |
| 258 | vfsmount_mark = NULL; |
Eric Paris | 5f3f259 | 2010-08-18 12:25:49 -0400 | [diff] [blame] | 259 | |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 260 | if (inode_node) { |
| 261 | inode_mark = hlist_entry(srcu_dereference(inode_node, &fsnotify_mark_srcu), |
Jan Kara | 0809ab6 | 2014-12-12 16:58:36 -0800 | [diff] [blame] | 262 | struct fsnotify_mark, obj_list); |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 263 | inode_group = inode_mark->group; |
Eric Paris | f72adfd | 2010-08-27 21:24:24 -0400 | [diff] [blame] | 264 | } |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 265 | |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 266 | if (vfsmount_node) { |
| 267 | vfsmount_mark = hlist_entry(srcu_dereference(vfsmount_node, &fsnotify_mark_srcu), |
Jan Kara | 0809ab6 | 2014-12-12 16:58:36 -0800 | [diff] [blame] | 268 | struct fsnotify_mark, obj_list); |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 269 | vfsmount_group = vfsmount_mark->group; |
Eric Paris | f72adfd | 2010-08-27 21:24:24 -0400 | [diff] [blame] | 270 | } |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 271 | |
Jan Kara | 8edc6e1 | 2014-11-13 15:19:33 -0800 | [diff] [blame] | 272 | if (inode_group && vfsmount_group) { |
| 273 | int cmp = fsnotify_compare_groups(inode_group, |
| 274 | vfsmount_group); |
| 275 | if (cmp > 0) { |
| 276 | inode_group = NULL; |
| 277 | inode_mark = NULL; |
| 278 | } else if (cmp < 0) { |
| 279 | vfsmount_group = NULL; |
| 280 | vfsmount_mark = NULL; |
| 281 | } |
Eric Paris | 7131485 | 2009-12-17 21:24:23 -0500 | [diff] [blame] | 282 | } |
Jan Kara | 8edc6e1 | 2014-11-13 15:19:33 -0800 | [diff] [blame] | 283 | ret = send_to_group(to_tell, inode_mark, vfsmount_mark, mask, |
| 284 | data, data_is, cookie, file_name); |
Eric Paris | 613a807 | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 285 | |
Eric Paris | ff8bcbd | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 286 | if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS)) |
| 287 | goto out; |
| 288 | |
Eric Paris | 92b4678 | 2010-08-27 21:42:11 -0400 | [diff] [blame] | 289 | if (inode_group) |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 290 | inode_node = srcu_dereference(inode_node->next, |
| 291 | &fsnotify_mark_srcu); |
Eric Paris | 92b4678 | 2010-08-27 21:42:11 -0400 | [diff] [blame] | 292 | if (vfsmount_group) |
Eric Paris | ce8f76f | 2010-07-28 10:18:39 -0400 | [diff] [blame] | 293 | vfsmount_node = srcu_dereference(vfsmount_node->next, |
| 294 | &fsnotify_mark_srcu); |
Eric Paris | 7131485 | 2009-12-17 21:24:23 -0500 | [diff] [blame] | 295 | } |
Eric Paris | ff8bcbd | 2010-10-28 17:21:56 -0400 | [diff] [blame] | 296 | ret = 0; |
| 297 | out: |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 298 | srcu_read_unlock(&fsnotify_mark_srcu, idx); |
Eric Paris | c4ec54b | 2009-12-17 21:24:34 -0500 | [diff] [blame] | 299 | |
Jean-Christophe Dubois | 98b5c10 | 2010-03-23 08:08:09 +0100 | [diff] [blame] | 300 | return ret; |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 301 | } |
| 302 | EXPORT_SYMBOL_GPL(fsnotify); |
| 303 | |
| 304 | static __init int fsnotify_init(void) |
| 305 | { |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 306 | int ret; |
| 307 | |
Eric Paris | 20dee62 | 2010-07-28 10:18:37 -0400 | [diff] [blame] | 308 | BUG_ON(hweight32(ALL_FSNOTIFY_EVENTS) != 23); |
| 309 | |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 310 | ret = init_srcu_struct(&fsnotify_mark_srcu); |
| 311 | if (ret) |
| 312 | panic("initializing fsnotify_mark_srcu"); |
| 313 | |
| 314 | return 0; |
Eric Paris | 9058652 | 2009-05-21 17:01:20 -0400 | [diff] [blame] | 315 | } |
Eric Paris | 75c1be4 | 2010-07-28 10:18:38 -0400 | [diff] [blame] | 316 | core_initcall(fsnotify_init); |