1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (C) 2008 Oracle.  All rights reserved.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 4 */
 5
 6#ifndef BTRFS_LOCKING_H
 7#define BTRFS_LOCKING_H
 8
 9#define BTRFS_WRITE_LOCK 1
10#define BTRFS_READ_LOCK 2
11#define BTRFS_WRITE_LOCK_BLOCKING 3
12#define BTRFS_READ_LOCK_BLOCKING 4
13
14void btrfs_tree_lock(struct extent_buffer *eb);
15void btrfs_tree_unlock(struct extent_buffer *eb);
16
17void btrfs_tree_read_lock(struct extent_buffer *eb);
18void btrfs_tree_read_unlock(struct extent_buffer *eb);
19void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
20void btrfs_set_lock_blocking_read(struct extent_buffer *eb);
21void btrfs_set_lock_blocking_write(struct extent_buffer *eb);
22void btrfs_assert_tree_locked(struct extent_buffer *eb);
23int btrfs_try_tree_read_lock(struct extent_buffer *eb);
24int btrfs_try_tree_write_lock(struct extent_buffer *eb);
25int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);
26
27
28static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
29{
30	if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
31		btrfs_tree_unlock(eb);
32	else if (rw == BTRFS_READ_LOCK_BLOCKING)
33		btrfs_tree_read_unlock_blocking(eb);
34	else if (rw == BTRFS_READ_LOCK)
35		btrfs_tree_read_unlock(eb);
36	else
37		BUG();
38}
39
 
 
 
 
 
 
 
 
 
40#endif

 
 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
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
27void btrfs_tree_lock(struct extent_buffer *eb);
28void btrfs_tree_unlock(struct extent_buffer *eb);
29
30void 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);
35void btrfs_assert_tree_locked(struct extent_buffer *eb);
36int btrfs_try_tree_read_lock(struct extent_buffer *eb);
37int btrfs_try_tree_write_lock(struct extent_buffer *eb);
38int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);
39
40
41static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
42{
43	if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
44		btrfs_tree_unlock(eb);
45	else if (rw == BTRFS_READ_LOCK_BLOCKING)
46		btrfs_tree_read_unlock_blocking(eb);
47	else if (rw == BTRFS_READ_LOCK)
48		btrfs_tree_read_unlock(eb);
49	else
50		BUG();
51}
52
53static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
54{
55	btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
56}
57
58static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb)
59{
60	btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING);
61}
62#endif