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       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                 :            : static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
      40                 :            : {
      41 [ #  # ][ #  # ]:          0 :         if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
         [ #  # ][ #  # ]
                 [ #  # ]
      42                 :          0 :                 btrfs_tree_unlock(eb);
      43 [ #  # ][ #  # ]:          0 :         else if (rw == BTRFS_READ_LOCK_BLOCKING)
         [ #  # ][ #  # ]
                 [ #  # ]
      44                 :          0 :                 btrfs_tree_read_unlock_blocking(eb);
      45 [ #  # ][ #  # ]:          0 :         else if (rw == BTRFS_READ_LOCK)
         [ #  # ][ #  # ]
                 [ #  # ]
      46                 :          0 :                 btrfs_tree_read_unlock(eb);
      47                 :            :         else
      48                 :          0 :                 BUG();
      49                 :            : }
      50                 :            : 
      51                 :            : static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
      52                 :            : {
      53                 :          0 :         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