projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |