Line data    Source code

       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             : 
      30             : void btrfs_tree_read_lock(struct extent_buffer *eb);
      31             : void btrfs_tree_read_unlock(struct extent_buffer *eb);
      32             : void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
      33             : void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw);
      34             : void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw);
      35             : void btrfs_assert_tree_locked(struct extent_buffer *eb);
      36             : int btrfs_try_tree_read_lock(struct extent_buffer *eb);
      37             : int btrfs_try_tree_write_lock(struct extent_buffer *eb);
      38             : 
      39     2367616 : static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
      40             : {
      41     2367616 :         if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
      42     1333354 :                 btrfs_tree_unlock(eb);
      43     1034262 :         else if (rw == BTRFS_READ_LOCK_BLOCKING)
      44      404518 :                 btrfs_tree_read_unlock_blocking(eb);
      45      629744 :         else if (rw == BTRFS_READ_LOCK)
      46      629744 :                 btrfs_tree_read_unlock(eb);
      47             :         else
      48           0 :                 BUG();
      49     2368300 : }
      50             : 
      51             : static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
      52             : {
      53      121768 :         btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
      54             : }
      55             : 
      56             : static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb)
      57             : {
      58             :         btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING);
      59             : }
      60             : #endif