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#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
14void btrfs_tree_lock(struct extent_buffer *eb);
15void btrfs_tree_unlock(struct extent_buffer *eb);
16
17void btrfs_tree_read_lock(struct extent_buffer *eb);
18void btrfs_tree_read_unlock(struct extent_buffer *eb);
19void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
20void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw);
21void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw);
22void btrfs_assert_tree_locked(struct extent_buffer *eb);
23int btrfs_try_tree_read_lock(struct extent_buffer *eb);
24int btrfs_try_tree_write_lock(struct extent_buffer *eb);
25int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);
26
27
28static 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
40static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
41{
42	btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
43}
44
45static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb)
46{
47	btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING);
48}
49#endif

 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#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
14void btrfs_tree_lock(struct extent_buffer *eb);
15void btrfs_tree_unlock(struct extent_buffer *eb);
16
17void btrfs_tree_read_lock(struct extent_buffer *eb);
18void btrfs_tree_read_unlock(struct extent_buffer *eb);
19void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
20void btrfs_set_lock_blocking_read(struct extent_buffer *eb);
21void btrfs_set_lock_blocking_write(struct extent_buffer *eb);
22void btrfs_assert_tree_locked(struct extent_buffer *eb);
23int btrfs_try_tree_read_lock(struct extent_buffer *eb);
24int btrfs_try_tree_write_lock(struct extent_buffer *eb);
25int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);
26
27
28static 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#endif