2 * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
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)
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.
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.
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/mutex.h>
24 #include <linux/spinlock.h>
26 #include <linux/atomic.h>
28 #include <linux/fsnotify_backend.h>
31 #include "../internal.h"
34 * Given a group clear all of the inode marks associated with that group.
36 void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
38 fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_OBJ_TYPE_INODE);
42 * given a group and inode, find the mark associated with that combination.
43 * if found take a reference to that mark and return it, else return NULL
45 struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group,
48 return fsnotify_find_mark(&inode->i_fsnotify_marks, group);
52 * fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes.
53 * @sb: superblock being unmounted.
55 * Called during unmount with no locks held, so needs to be safe against
56 * concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block.
58 void fsnotify_unmount_inodes(struct super_block *sb)
60 struct inode *inode, *iput_inode = NULL;
62 spin_lock(&sb->s_inode_list_lock);
63 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
65 * We cannot __iget() an inode in state I_FREEING,
66 * I_WILL_FREE, or I_NEW which is fine because by that point
67 * the inode cannot have any associated watches.
69 spin_lock(&inode->i_lock);
70 if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) {
71 spin_unlock(&inode->i_lock);
76 * If i_count is zero, the inode cannot have any watches and
77 * doing an __iget/iput with MS_ACTIVE clear would actually
78 * evict all inodes with zero i_count from icache which is
79 * unnecessarily violent and may in fact be illegal to do.
81 if (!atomic_read(&inode->i_count)) {
82 spin_unlock(&inode->i_lock);
87 spin_unlock(&inode->i_lock);
88 spin_unlock(&sb->s_inode_list_lock);
93 /* for each watch, send FS_UNMOUNT and then remove it */
94 fsnotify(inode, FS_UNMOUNT, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
96 fsnotify_inode_delete(inode);
100 spin_lock(&sb->s_inode_list_lock);
102 spin_unlock(&sb->s_inode_list_lock);