disk-io.h

   1 /*
   2  * Copyright (C) 2007 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 __DISKIO__
  20 #define __DISKIO__
  21 #include "extent-cache.h"
  22 #include "list.h"
  23
  24 struct btrfs_buffer {
  25         struct cache_extent cache_node;
  26         u64 bytenr;
  27         u64 dev_bytenr;
  28         u32 size;
  29         int count;
  30         int fd;
  31         struct list_head dirty;
  32         struct list_head cache;
  33         union {
  34                 struct btrfs_node node;
  35                 struct btrfs_leaf leaf;
  36         };
  37 };
  38
  39 struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
  40                                      u32 blocksize);
  41 struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 bytenr,
  42                                      u32 blocksize);
  43 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  44                      struct btrfs_buffer *buf);
  45 int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  46                      struct btrfs_buffer *buf);
  47 int clean_tree_block(struct btrfs_trans_handle *trans,
  48                      struct btrfs_root *root, struct btrfs_buffer *buf);
  49 int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root
  50                              *root, struct btrfs_super_block *s);
  51 struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *s);
  52 struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super);
  53 int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s);
  54 void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf);
  55 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  56                       struct btrfs_super_block *s);
  57 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct btrfs_buffer *bh,
  58                              u64 logical);
  59 int btrfs_csum_super(struct btrfs_root *root, struct btrfs_super_block *super);
  60 int btrfs_csum_node(struct btrfs_root *root, struct btrfs_node *node);
  61 #define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
  62
  63 #endif