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925baedd CM |
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 |