projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 925baedd CM |
1 | /* |
| 2 | * Copyright (C) 2008 Oracle. All rights reserved. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or | |
| 5 | * modify it under the terms of the GNU General Public | |
| 6 | * License v2 as published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, | |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 11 | * General Public License for more details. | |
| 12 | * | |
| 13 | * You should have received a copy of the GNU General Public | |
| 14 | * License along with this program; if not, write to the | |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 16 | * Boston, MA 021110-1307, USA. | |
| 17 | */ | |
| 18 | ||
| 19 | #ifndef __BTRFS_LOCKING_ | |
| 20 | #define __BTRFS_LOCKING_ | |
| 21 | ||
| bd681513 CM |
22 | #define BTRFS_WRITE_LOCK 1 |
| 23 | #define BTRFS_READ_LOCK 2 | |
| 24 | #define BTRFS_WRITE_LOCK_BLOCKING 3 | |
| 25 | #define BTRFS_READ_LOCK_BLOCKING 4 | |
| 26 | ||
| 925baedd CM |
27 | int btrfs_tree_lock(struct extent_buffer *eb); |
| 28 | int btrfs_tree_unlock(struct extent_buffer *eb); | |
| b4ce94de CM |
29 | int btrfs_try_spin_lock(struct extent_buffer *eb); |
| 30 | ||
| bd681513 CM |
31 | void btrfs_tree_read_lock(struct extent_buffer *eb); |
| 32 | void btrfs_tree_read_unlock(struct extent_buffer *eb); | |
| 33 | void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb); | |
| 34 | void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw); | |
| 35 | void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw); | |
| b9447ef8 | 36 | void btrfs_assert_tree_locked(struct extent_buffer *eb); |
| bd681513 CM |
37 | int btrfs_try_tree_read_lock(struct extent_buffer *eb); |
| 38 | int btrfs_try_tree_write_lock(struct extent_buffer *eb); | |
| 39 | ||
| 40 | static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw) | |
| 41 | { | |
| 42 | if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING) | |
| 43 | btrfs_tree_unlock(eb); | |
| 44 | else if (rw == BTRFS_READ_LOCK_BLOCKING) | |
| 45 | btrfs_tree_read_unlock_blocking(eb); | |
| 46 | else if (rw == BTRFS_READ_LOCK) | |
| 47 | btrfs_tree_read_unlock(eb); | |
| 48 | else | |
| 49 | BUG(); | |
| 50 | } | |
| 51 | ||
| 52 | static inline void btrfs_set_lock_blocking(struct extent_buffer *eb) | |
| 53 | { | |
| 54 | btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK); | |
| 55 | } | |
| 56 | ||
| 57 | static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb) | |
| 58 | { | |
| 59 | btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING); | |
| 60 | } | |
| 925baedd | 61 | #endif |