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0d48b7f0 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 | ||
19 | #include <linux/fs.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/mutex.h> | |
0d48b7f0 | 25 | #include <linux/spinlock.h> |
0d48b7f0 | 26 | |
60063497 | 27 | #include <linux/atomic.h> |
0d48b7f0 EP |
28 | |
29 | #include <linux/fsnotify_backend.h> | |
30 | #include "fsnotify.h" | |
c63181e6 | 31 | #include "../mount.h" |
0d48b7f0 EP |
32 | |
33 | void fsnotify_clear_marks_by_mount(struct vfsmount *mnt) | |
34 | { | |
0809ab69 | 35 | struct fsnotify_mark *mark; |
b67bfe0d | 36 | struct hlist_node *n; |
c63181e6 | 37 | struct mount *m = real_mount(mnt); |
0d48b7f0 EP |
38 | LIST_HEAD(free_list); |
39 | ||
40 | spin_lock(&mnt->mnt_root->d_lock); | |
0809ab69 JK |
41 | hlist_for_each_entry_safe(mark, n, &m->mnt_fsnotify_marks, obj_list) { |
42 | list_add(&mark->free_list, &free_list); | |
43 | hlist_del_init_rcu(&mark->obj_list); | |
0d48b7f0 EP |
44 | fsnotify_get_mark(mark); |
45 | } | |
46 | spin_unlock(&mnt->mnt_root->d_lock); | |
47 | ||
0809ab69 | 48 | fsnotify_destroy_marks(&free_list); |
0d48b7f0 EP |
49 | } |
50 | ||
4d92604c EP |
51 | void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group) |
52 | { | |
53 | fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_VFSMOUNT); | |
54 | } | |
55 | ||
0d48b7f0 EP |
56 | /* |
57 | * Recalculate the mnt->mnt_fsnotify_mask, or the mask of all FS_* event types | |
58 | * any notifier is interested in hearing for this mount point | |
59 | */ | |
60 | void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt) | |
61 | { | |
0809ab69 JK |
62 | struct mount *m = real_mount(mnt); |
63 | ||
0d48b7f0 | 64 | spin_lock(&mnt->mnt_root->d_lock); |
0809ab69 | 65 | m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks); |
0d48b7f0 EP |
66 | spin_unlock(&mnt->mnt_root->d_lock); |
67 | } | |
68 | ||
69 | void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark) | |
70 | { | |
0809ab69 JK |
71 | struct vfsmount *mnt = mark->mnt; |
72 | struct mount *m = real_mount(mnt); | |
0d48b7f0 | 73 | |
986ab098 | 74 | BUG_ON(!mutex_is_locked(&mark->group->mark_mutex)); |
0d48b7f0 | 75 | assert_spin_locked(&mark->lock); |
0d48b7f0 EP |
76 | |
77 | spin_lock(&mnt->mnt_root->d_lock); | |
78 | ||
0809ab69 JK |
79 | hlist_del_init_rcu(&mark->obj_list); |
80 | mark->mnt = NULL; | |
0d48b7f0 | 81 | |
0809ab69 | 82 | m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks); |
0d48b7f0 EP |
83 | spin_unlock(&mnt->mnt_root->d_lock); |
84 | } | |
85 | ||
0d48b7f0 EP |
86 | /* |
87 | * given a group and vfsmount, find the mark associated with that combination. | |
88 | * if found take a reference to that mark and return it, else return NULL | |
89 | */ | |
90 | struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, | |
91 | struct vfsmount *mnt) | |
92 | { | |
0809ab69 | 93 | struct mount *m = real_mount(mnt); |
0d48b7f0 EP |
94 | struct fsnotify_mark *mark; |
95 | ||
96 | spin_lock(&mnt->mnt_root->d_lock); | |
0809ab69 | 97 | mark = fsnotify_find_mark(&m->mnt_fsnotify_marks, group); |
0d48b7f0 EP |
98 | spin_unlock(&mnt->mnt_root->d_lock); |
99 | ||
100 | return mark; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Attach an initialized mark to a given group and vfsmount. | |
105 | * These marks may be used for the fsnotify backend to determine which | |
106 | * event types should be delivered to which groups. | |
107 | */ | |
108 | int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark, | |
109 | struct fsnotify_group *group, struct vfsmount *mnt, | |
110 | int allow_dups) | |
111 | { | |
c63181e6 | 112 | struct mount *m = real_mount(mnt); |
0809ab69 | 113 | int ret; |
0d48b7f0 | 114 | |
700307a2 | 115 | mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT; |
0d48b7f0 | 116 | |
986ab098 | 117 | BUG_ON(!mutex_is_locked(&group->mark_mutex)); |
0d48b7f0 | 118 | assert_spin_locked(&mark->lock); |
0d48b7f0 EP |
119 | |
120 | spin_lock(&mnt->mnt_root->d_lock); | |
0809ab69 JK |
121 | mark->mnt = mnt; |
122 | ret = fsnotify_add_mark_list(&m->mnt_fsnotify_marks, mark, allow_dups); | |
123 | m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks); | |
0d48b7f0 EP |
124 | spin_unlock(&mnt->mnt_root->d_lock); |
125 | ||
126 | return ret; | |
127 | } |