root/fs/btrfs/locking.h

INCLUDED FROM

DEFINITIONS

1. btrfs_tree_unlock_rw

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2008 Oracle.  All rights reserved.
   4  */
   5 
   6 #ifndef BTRFS_LOCKING_H
   7 #define BTRFS_LOCKING_H
   8 
   9 #define BTRFS_WRITE_LOCK 1
  10 #define BTRFS_READ_LOCK 2
  11 #define BTRFS_WRITE_LOCK_BLOCKING 3
  12 #define BTRFS_READ_LOCK_BLOCKING 4
  13 
  14 void btrfs_tree_lock(struct extent_buffer *eb);
  15 void btrfs_tree_unlock(struct extent_buffer *eb);
  16 
  17 void btrfs_tree_read_lock(struct extent_buffer *eb);
  18 void btrfs_tree_read_unlock(struct extent_buffer *eb);
  19 void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb);
  20 void btrfs_set_lock_blocking_read(struct extent_buffer *eb);
  21 void btrfs_set_lock_blocking_write(struct extent_buffer *eb);
  22 void btrfs_assert_tree_locked(struct extent_buffer *eb);
  23 int btrfs_try_tree_read_lock(struct extent_buffer *eb);
  24 int btrfs_try_tree_write_lock(struct extent_buffer *eb);
  25 int btrfs_tree_read_lock_atomic(struct extent_buffer *eb);
  26 
  27 
  28 static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
  29 {
  30         if (rw == BTRFS_WRITE_LOCK || rw == BTRFS_WRITE_LOCK_BLOCKING)
  31                 btrfs_tree_unlock(eb);
  32         else if (rw == BTRFS_READ_LOCK_BLOCKING)
  33                 btrfs_tree_read_unlock_blocking(eb);
  34         else if (rw == BTRFS_READ_LOCK)
  35                 btrfs_tree_read_unlock(eb);
  36         else
  37                 BUG();
  38 }
  39 
  40 #endif