blob: b81e0e9a48941891681eef385d10d071f6cbe51b [file] [log] [blame]
Chris Mason925baed2008-06-25 16:01:30 -04001/*
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
19#ifndef __BTRFS_LOCKING_
20#define __BTRFS_LOCKING_
21
Chris Masonbd681512011-07-16 15:23:14 -040022#define BTRFS_WRITE_LOCK 1
23#define BTRFS_READ_LOCK 2
24#define BTRFS_WRITE_LOCK_BLOCKING 3
25#define BTRFS_READ_LOCK_BLOCKING 4
26
Jeff Mahoney143bede2012-03-01 14:56:26 +010027void btrfs_tree_lock(struct extent_buffer *eb);
28void btrfs_tree_unlock(struct extent_buffer *eb);
Chris Masonb4ce94d2009-02-04 09:25:08 -050029
Chris Masonbd681512011-07-16 15:23:14 -040030void btrfs_tree_read_lock(struct extent_buffer *eb);
31void btrfs_tree_read_unlock(struct extent_buffer *eb);
32void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
33void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw);
34void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw);
Chris Masonb9447ef2009-03-09 11:45:38 -040035void btrfs_assert_tree_locked(struct extent_buffer *eb);
Chris Masonbd681512011-07-16 15:23:14 -040036int btrfs_try_tree_read_lock(struct extent_buffer *eb);
37int btrfs_try_tree_write_lock(struct extent_buffer *eb);
38
39static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
40{
41 if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
42 btrfs_tree_unlock(eb);
43 else if (rw == BTRFS_READ_LOCK_BLOCKING)
44 btrfs_tree_read_unlock_blocking(eb);
45 else if (rw == BTRFS_READ_LOCK)
46 btrfs_tree_read_unlock(eb);
47 else
48 BUG();
49}
50
51static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
52{
53 btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
54}
55
56static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb)
57{
58 btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING);
59}
Chris Mason925baed2008-06-25 16:01:30 -040060#endif