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9888c340 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
925baedd CM |
2 | /* |
3 | * Copyright (C) 2008 Oracle. All rights reserved. | |
925baedd CM |
4 | */ |
5 | ||
9888c340 DS |
6 | #ifndef BTRFS_LOCKING_H |
7 | #define BTRFS_LOCKING_H | |
925baedd | 8 | |
bd681513 CM |
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 | ||
143bede5 JM |
14 | void btrfs_tree_lock(struct extent_buffer *eb); |
15 | void btrfs_tree_unlock(struct extent_buffer *eb); | |
b4ce94de | 16 | |
bd681513 CM |
17 | void btrfs_tree_read_lock(struct extent_buffer *eb); |
18 | void btrfs_tree_read_unlock(struct extent_buffer *eb); | |
19 | void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb); | |
20 | void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw); | |
21 | void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw); | |
b9447ef8 | 22 | void btrfs_assert_tree_locked(struct extent_buffer *eb); |
bd681513 CM |
23 | int btrfs_try_tree_read_lock(struct extent_buffer *eb); |
24 | int btrfs_try_tree_write_lock(struct extent_buffer *eb); | |
f82c458a CM |
25 | int btrfs_tree_read_lock_atomic(struct extent_buffer *eb); |
26 | ||
bd681513 CM |
27 | |
28 | static 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 | static inline void btrfs_set_lock_blocking(struct extent_buffer *eb) | |
41 | { | |
42 | btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK); | |
43 | } | |
44 | ||
45 | static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb) | |
46 | { | |
47 | btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING); | |
48 | } | |
925baedd | 49 | #endif |