Branch data Line data Source code
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 : :
27 : : void btrfs_tree_lock(struct extent_buffer *eb);
28 : : void btrfs_tree_unlock(struct extent_buffer *eb);
29 : :
30 : : void btrfs_tree_read_lock(struct extent_buffer *eb);
31 : : void btrfs_tree_read_unlock(struct extent_buffer *eb);
32 : : void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
33 : : void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw);
34 : : void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw);
35 : : void btrfs_assert_tree_locked(struct extent_buffer *eb);
36 : : int btrfs_try_tree_read_lock(struct extent_buffer *eb);
37 : : int btrfs_try_tree_write_lock(struct extent_buffer *eb);
38 : :
39 : : static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
40 : : {
41 [ # # ][ # # ]: 0 : if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
[ # # ][ # # ]
[ # # ]
42 : 0 : btrfs_tree_unlock(eb);
43 [ # # ][ # # ]: 0 : else if (rw == BTRFS_READ_LOCK_BLOCKING)
[ # # ][ # # ]
[ # # ]
44 : 0 : btrfs_tree_read_unlock_blocking(eb);
45 [ # # ][ # # ]: 0 : else if (rw == BTRFS_READ_LOCK)
[ # # ][ # # ]
[ # # ]
46 : 0 : btrfs_tree_read_unlock(eb);
47 : : else
48 : 0 : BUG();
49 : : }
50 : :
51 : : static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
52 : : {
53 : 0 : btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
54 : : }
55 : :
56 : : static 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
|