text: /* SPDX-License-Identifier: GPL-2.0 */
  /*
   * Copyright (C) 2008 Oracle.  All rights reserved.
   */
  
  #ifndef BTRFS_LOCKING_H
  #define BTRFS_LOCKING_H
  
  #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_read(struct extent_buffer *eb);
  void btrfs_set_lock_blocking_write(struct extent_buffer *eb);
  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();
  }
  
  #endif
  