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
27int btrfs_tree_lock(struct extent_buffer *eb);
28int btrfs_tree_unlock(struct extent_buffer *eb);
29int btrfs_try_spin_lock(struct extent_buffer *eb);
30
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);
36void btrfs_assert_tree_locked(struct extent_buffer *eb);
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}
61#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);
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}
60#endif