| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | |
| 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 | |
| 27 | void btrfs_tree_lock(struct extent_buffer *eb); |
| 28 | void btrfs_tree_unlock(struct extent_buffer *eb); |
| 29 | int btrfs_try_spin_lock(struct extent_buffer *eb); |
| 30 | |
| 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); |
| 36 | void btrfs_assert_tree_locked(struct extent_buffer *eb); |
| 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 | } |
| 61 | #endif |