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3be25f49 EP |
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 | ||
3be25f49 EP |
19 | #include <linux/fs.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mutex.h> | |
3be25f49 EP |
24 | #include <linux/spinlock.h> |
25 | ||
60063497 | 26 | #include <linux/atomic.h> |
3be25f49 EP |
27 | |
28 | #include <linux/fsnotify_backend.h> | |
29 | #include "fsnotify.h" | |
30 | ||
55fa6091 DC |
31 | #include "../internal.h" |
32 | ||
4d92604c EP |
33 | /* |
34 | * Given a group clear all of the inode marks associated with that group. | |
35 | */ | |
36 | void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group) | |
37 | { | |
86ffe245 | 38 | fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_OBJ_TYPE_INODE); |
4d92604c EP |
39 | } |
40 | ||
3be25f49 | 41 | /* |
35566087 AG |
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 | |
3be25f49 | 44 | */ |
5444e298 EP |
45 | struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group, |
46 | struct inode *inode) | |
35566087 | 47 | { |
08991e83 | 48 | return fsnotify_find_mark(&inode->i_fsnotify_marks, group); |
35566087 | 49 | } |
3be25f49 | 50 | |
164bc619 EP |
51 | /** |
52 | * fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes. | |
74278da9 | 53 | * @sb: superblock being unmounted. |
164bc619 | 54 | * |
55fa6091 | 55 | * Called during unmount with no locks held, so needs to be safe against |
74278da9 | 56 | * concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block. |
164bc619 | 57 | */ |
74278da9 | 58 | void fsnotify_unmount_inodes(struct super_block *sb) |
164bc619 | 59 | { |
5716863e | 60 | struct inode *inode, *iput_inode = NULL; |
164bc619 | 61 | |
74278da9 | 62 | spin_lock(&sb->s_inode_list_lock); |
5716863e | 63 | list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
164bc619 | 64 | /* |
a4ffdde6 | 65 | * We cannot __iget() an inode in state I_FREEING, |
164bc619 EP |
66 | * I_WILL_FREE, or I_NEW which is fine because by that point |
67 | * the inode cannot have any associated watches. | |
68 | */ | |
250df6ed DC |
69 | spin_lock(&inode->i_lock); |
70 | if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) { | |
71 | spin_unlock(&inode->i_lock); | |
164bc619 | 72 | continue; |
250df6ed | 73 | } |
164bc619 EP |
74 | |
75 | /* | |
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. | |
80 | */ | |
250df6ed DC |
81 | if (!atomic_read(&inode->i_count)) { |
82 | spin_unlock(&inode->i_lock); | |
164bc619 | 83 | continue; |
250df6ed | 84 | } |
164bc619 | 85 | |
5716863e | 86 | __iget(inode); |
250df6ed | 87 | spin_unlock(&inode->i_lock); |
74278da9 | 88 | spin_unlock(&sb->s_inode_list_lock); |
164bc619 | 89 | |
5716863e JK |
90 | if (iput_inode) |
91 | iput(iput_inode); | |
164bc619 EP |
92 | |
93 | /* for each watch, send FS_UNMOUNT and then remove it */ | |
94 | fsnotify(inode, FS_UNMOUNT, inode, FSNOTIFY_EVENT_INODE, NULL, 0); | |
95 | ||
96 | fsnotify_inode_delete(inode); | |
97 | ||
5716863e | 98 | iput_inode = inode; |
164bc619 | 99 | |
74278da9 | 100 | spin_lock(&sb->s_inode_list_lock); |
164bc619 | 101 | } |
74278da9 | 102 | spin_unlock(&sb->s_inode_list_lock); |
5716863e JK |
103 | |
104 | if (iput_inode) | |
105 | iput(iput_inode); | |
164bc619 | 106 | } |