Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2008 Oracle. All rights reserved.
4 */
5
6#ifndef BTRFS_LOCKING_H
7#define BTRFS_LOCKING_H
8
9#include "extent_io.h"
10
11#define BTRFS_WRITE_LOCK 1
12#define BTRFS_READ_LOCK 2
13#define BTRFS_WRITE_LOCK_BLOCKING 3
14#define BTRFS_READ_LOCK_BLOCKING 4
15
16void btrfs_tree_lock(struct extent_buffer *eb);
17void btrfs_tree_unlock(struct extent_buffer *eb);
18
19void btrfs_tree_read_lock(struct extent_buffer *eb);
20void btrfs_tree_read_unlock(struct extent_buffer *eb);
21void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
22void btrfs_set_lock_blocking_read(struct extent_buffer *eb);
23void btrfs_set_lock_blocking_write(struct extent_buffer *eb);
24int btrfs_try_tree_read_lock(struct extent_buffer *eb);
25int btrfs_try_tree_write_lock(struct extent_buffer *eb);
26int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);
27
28#ifdef CONFIG_BTRFS_DEBUG
29static inline void btrfs_assert_tree_locked(struct extent_buffer *eb) {
30 BUG_ON(!eb->write_locks);
31}
32#else
33static inline void btrfs_assert_tree_locked(struct extent_buffer *eb) { }
34#endif
35
36void btrfs_set_path_blocking(struct btrfs_path *p);
37void btrfs_unlock_up_safe(struct btrfs_path *path, int level);
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
51#endif