| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2008 Oracle. All rights reserved. |
| */ |
| |
| #ifndef BTRFS_LOCKING_H |
| #define BTRFS_LOCKING_H |
| |
| #define BTRFS_WRITE_LOCK 1 |
| #define BTRFS_READ_LOCK 2 |
| #define BTRFS_WRITE_LOCK_BLOCKING 3 |
| #define BTRFS_READ_LOCK_BLOCKING 4 |
| |
| void btrfs_tree_lock(struct extent_buffer *eb); |
| void btrfs_tree_unlock(struct extent_buffer *eb); |
| |
| void btrfs_tree_read_lock(struct extent_buffer *eb); |
| void btrfs_tree_read_unlock(struct extent_buffer *eb); |
| void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb); |
| void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw); |
| void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw); |
| void btrfs_assert_tree_locked(struct extent_buffer *eb); |
| int btrfs_try_tree_read_lock(struct extent_buffer *eb); |
| int btrfs_try_tree_write_lock(struct extent_buffer *eb); |
| int btrfs_tree_read_lock_atomic(struct extent_buffer *eb); |
| |
| |
| static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw) |
| { |
| if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING) |
| btrfs_tree_unlock(eb); |
| else if (rw == BTRFS_READ_LOCK_BLOCKING) |
| btrfs_tree_read_unlock_blocking(eb); |
| else if (rw == BTRFS_READ_LOCK) |
| btrfs_tree_read_unlock(eb); |
| else |
| BUG(); |
| } |
| |
| static inline void btrfs_set_lock_blocking(struct extent_buffer *eb) |
| { |
| btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK); |
| } |
| |
| static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb) |
| { |
| btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING); |
| } |
| #endif |
