projects / mirror_ubuntu-hirsute-kernel.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 | |
| 2992df73 NB |
9 | #include <linux/atomic.h> |
| 10 | #include <linux/wait.h> | |
| 11 | #include <linux/percpu_counter.h> | |
| 31f6e769 DS |
12 | #include "extent_io.h" |
| 13 | ||
| bd681513 CM |
14 | #define BTRFS_WRITE_LOCK 1 |
| 15 | #define BTRFS_READ_LOCK 2 | |
| 16 | #define BTRFS_WRITE_LOCK_BLOCKING 3 | |
| 17 | #define BTRFS_READ_LOCK_BLOCKING 4 | |
| 18 | ||
| 2992df73 NB |
19 | struct btrfs_path; |
| 20 | ||
| 143bede5 JM |
21 | void btrfs_tree_lock(struct extent_buffer *eb); |
| 22 | void btrfs_tree_unlock(struct extent_buffer *eb); | |
| b4ce94de | 23 | |
| bd681513 CM |
24 | void btrfs_tree_read_lock(struct extent_buffer *eb); |
| 25 | void btrfs_tree_read_unlock(struct extent_buffer *eb); | |
| 26 | void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb); | |
| b95be2d9 DS |
27 | void btrfs_set_lock_blocking_read(struct extent_buffer *eb); |
| 28 | void btrfs_set_lock_blocking_write(struct extent_buffer *eb); | |
| bd681513 CM |
29 | int btrfs_try_tree_read_lock(struct extent_buffer *eb); |
| 30 | int btrfs_try_tree_write_lock(struct extent_buffer *eb); | |
| f82c458a CM |
31 | int btrfs_tree_read_lock_atomic(struct extent_buffer *eb); |
| 32 | ||
| 31f6e769 DS |
33 | #ifdef CONFIG_BTRFS_DEBUG |
| 34 | static inline void btrfs_assert_tree_locked(struct extent_buffer *eb) { | |
| 35 | BUG_ON(!eb->write_locks); | |
| 36 | } | |
| 37 | #else | |
| 38 | static inline void btrfs_assert_tree_locked(struct extent_buffer *eb) { } | |
| 39 | #endif | |
| bd681513 | 40 | |
| ed2b1d36 | 41 | void btrfs_set_path_blocking(struct btrfs_path *p); |
| 1f95ec01 | 42 | void btrfs_unlock_up_safe(struct btrfs_path *path, int level); |
| ed2b1d36 | 43 | |
| bd681513 CM |
44 | static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw) |
| 45 | { | |
| 46 | if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING) | |
| 47 | btrfs_tree_unlock(eb); | |
| 48 | else if (rw == BTRFS_READ_LOCK_BLOCKING) | |
| 49 | btrfs_tree_read_unlock_blocking(eb); | |
| 50 | else if (rw == BTRFS_READ_LOCK) | |
| 51 | btrfs_tree_read_unlock(eb); | |
| 52 | else | |
| 53 | BUG(); | |
| 54 | } | |
| 55 | ||
| 2992df73 NB |
56 | struct btrfs_drew_lock { |
| 57 | atomic_t readers; | |
| 58 | struct percpu_counter writers; | |
| 59 | wait_queue_head_t pending_writers; | |
| 60 | wait_queue_head_t pending_readers; | |
| 61 | }; | |
| 62 | ||
| 63 | int btrfs_drew_lock_init(struct btrfs_drew_lock *lock); | |
| 64 | void btrfs_drew_lock_destroy(struct btrfs_drew_lock *lock); | |
| 65 | void btrfs_drew_write_lock(struct btrfs_drew_lock *lock); | |
| 66 | bool btrfs_drew_try_write_lock(struct btrfs_drew_lock *lock); | |
| 67 | void btrfs_drew_write_unlock(struct btrfs_drew_lock *lock); | |
| 68 | void btrfs_drew_read_lock(struct btrfs_drew_lock *lock); | |
| 69 | void btrfs_drew_read_unlock(struct btrfs_drew_lock *lock); | |
| 70 | ||
| 925baedd | 71 | #endif |