| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | |
| 14 | void btrfs_tree_lock(struct extent_buffer *eb); |
| 15 | void btrfs_tree_unlock(struct extent_buffer *eb); |
| 16 | |
| 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); |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 20 | void btrfs_set_lock_blocking_read(struct extent_buffer *eb); |
| 21 | void btrfs_set_lock_blocking_write(struct extent_buffer *eb); |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 22 | void btrfs_assert_tree_locked(struct extent_buffer *eb); |
| 23 | int btrfs_try_tree_read_lock(struct extent_buffer *eb); |
| 24 | int btrfs_try_tree_write_lock(struct extent_buffer *eb); |
| 25 | int btrfs_tree_read_lock_atomic(struct extent_buffer *eb); |
| 26 | |
| 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 | |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 40 | #endif |