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
  22 #define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
  23 #define BTRFS_SUPER_INFO_SIZE 4096
  24
  25 struct btrfs_device;
  26
  27 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
  28                                       u32 blocksize, u64 parent_transid);
  29 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  30                          u64 parent_transid);
  31 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  32                                                    u64 bytenr, u32 blocksize);
  33 int clean_tree_block(struct btrfs_trans_handle *trans,
  34                      struct btrfs_root *root, struct extent_buffer *buf);
  35 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes);
  36 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
  37                                  int writes);
  38 int close_ctree(struct btrfs_root *root);
  39 int write_ctree_super(struct btrfs_trans_handle *trans,
  40                       struct btrfs_root *root);
  41 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct extent_buffer *bh,
  42                             u64 logical);
  43 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  44                                             u64 bytenr, u32 blocksize);
  45 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
  46                                       struct btrfs_key *location);
  47 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
  48 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
  49 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
  50 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
  51 int wait_on_tree_block_writeback(struct btrfs_root *root,
  52                                  struct extent_buffer *buf);
  53 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
  54 void btrfs_csum_final(u32 crc, char *result);
  55
  56 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
  57                              struct btrfs_root *root);
  58 int btrfs_open_device(struct btrfs_device *dev);
  59 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
  60                     int verify);
  61 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
  62 #endif