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[mirror_ubuntu-bionic-kernel.git] / fs / btrfs / locking.h
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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
19#ifndef __BTRFS_LOCKING_
20#define __BTRFS_LOCKING_
21
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22#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
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27void btrfs_tree_lock(struct extent_buffer *eb);
28void btrfs_tree_unlock(struct extent_buffer *eb);
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29int btrfs_try_spin_lock(struct extent_buffer *eb);
30
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31void btrfs_tree_read_lock(struct extent_buffer *eb);
32void btrfs_tree_read_unlock(struct extent_buffer *eb);
33void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
34void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw);
35void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw);
b9447ef8 36void btrfs_assert_tree_locked(struct extent_buffer *eb);
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37int btrfs_try_tree_read_lock(struct extent_buffer *eb);
38int btrfs_try_tree_write_lock(struct extent_buffer *eb);
39
40static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
41{
42 if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
43 btrfs_tree_unlock(eb);
44 else if (rw == BTRFS_READ_LOCK_BLOCKING)
45 btrfs_tree_read_unlock_blocking(eb);
46 else if (rw == BTRFS_READ_LOCK)
47 btrfs_tree_read_unlock(eb);
48 else
49 BUG();
50}
51
52static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
53{
54 btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
55}
56
57static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb)
58{
59 btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING);
60}
925baedd 61#endif