/*
   * Copyright (C) 2008 Oracle.  All rights reserved.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public
   * License v2 as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public
   * License along with this program; if not, write to the
   * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   * Boston, MA 021110-1307, USA.
   */
  
  #ifndef __BTRFS_LOCKING_
  #define __BTRFS_LOCKING_

  #define BTRFS_WRITE_LOCK 1
  #define BTRFS_READ_LOCK 2
  #define BTRFS_WRITE_LOCK_BLOCKING 3
  #define BTRFS_READ_LOCK_BLOCKING 4

  void btrfs_tree_lock(struct extent_buffer *eb);
  void btrfs_tree_unlock(struct extent_buffer *eb);

  void btrfs_tree_read_lock(struct extent_buffer *eb);
  void btrfs_tree_read_unlock(struct extent_buffer *eb);
  void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
  void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw);
  void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw);

  void btrfs_assert_tree_locked(struct extent_buffer *eb);

  int btrfs_try_tree_read_lock(struct extent_buffer *eb);
  int btrfs_try_tree_write_lock(struct extent_buffer *eb);

  int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);

  
  static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
  {
  	if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
  		btrfs_tree_unlock(eb);
  	else if (rw == BTRFS_READ_LOCK_BLOCKING)
  		btrfs_tree_read_unlock_blocking(eb);
  	else if (rw == BTRFS_READ_LOCK)
  		btrfs_tree_read_unlock(eb);
  	else
  		BUG();
  }
  
  static inline void btrfs_set_lock_blocking(struct extent_buffer *eb)
  {
  	btrfs_set_lock_blocking_rw(eb, BTRFS_WRITE_LOCK);
  }
  
  static inline void btrfs_clear_lock_blocking(struct extent_buffer *eb)
  {
  	btrfs_clear_lock_blocking_rw(eb, BTRFS_WRITE_LOCK_BLOCKING);
  }

  #endif