diff options
Diffstat (limited to 'fs/btrfs/locking.c')
-rw-r--r-- | fs/btrfs/locking.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c new file mode 100644 index 00000000000..80813a307b4 --- /dev/null +++ b/fs/btrfs/locking.c | |||
@@ -0,0 +1,50 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2008 Oracle. All rights reserved. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or | ||
5 | * modify it under the terms of the GNU General Public | ||
6 | * License v2 as published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope that it will be useful, | ||
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
11 | * General Public License for more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public | ||
14 | * License along with this program; if not, write to the | ||
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | ||
16 | * Boston, MA 021110-1307, USA. | ||
17 | */ | ||
18 | #include <linux/sched.h> | ||
19 | #include <linux/gfp.h> | ||
20 | #include <linux/pagemap.h> | ||
21 | #include <linux/spinlock.h> | ||
22 | #include <linux/page-flags.h> | ||
23 | #include <linux/bug.h> | ||
24 | #include "ctree.h" | ||
25 | #include "extent_io.h" | ||
26 | #include "locking.h" | ||
27 | |||
28 | int btrfs_tree_lock(struct extent_buffer *eb) | ||
29 | { | ||
30 | lock_page(eb->first_page); | ||
31 | return 0; | ||
32 | } | ||
33 | |||
34 | int btrfs_try_tree_lock(struct extent_buffer *eb) | ||
35 | { | ||
36 | return TestSetPageLocked(eb->first_page); | ||
37 | } | ||
38 | |||
39 | int btrfs_tree_unlock(struct extent_buffer *eb) | ||
40 | { | ||
41 | WARN_ON(!PageLocked(eb->first_page)); | ||
42 | unlock_page(eb->first_page); | ||
43 | return 0; | ||
44 | } | ||
45 | |||
46 | int btrfs_tree_locked(struct extent_buffer *eb) | ||
47 | { | ||
48 | return PageLocked(eb->first_page); | ||
49 | } | ||
50 | |||