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 (64 * 1024)
  23 #define BTRFS_SUPER_INFO_SIZE 4096
  24
  25 #define BTRFS_SUPER_MIRROR_MAX   3
  26 #define BTRFS_SUPER_MIRROR_SHIFT 12
  27
  28 static inline u64 btrfs_sb_offset(int mirror)
  29 {
  30         u64 start = 16 * 1024;
  31         if (mirror)
  32                 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
  33         return BTRFS_SUPER_INFO_OFFSET;
  34 }
  35
  36 struct btrfs_device;
  37
  38 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
  39                                       u32 blocksize, u64 parent_transid);
  40 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  41                          u64 parent_transid);
  42 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  43                                                    u64 bytenr, u32 blocksize);
  44 int clean_tree_block(struct btrfs_trans_handle *trans,
  45                      struct btrfs_root *root, struct extent_buffer *buf);
  46 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes);
  47 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
  48                                  int writes);
  49 struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
  50                                        u64 root_tree_bytenr);
  51 int close_ctree(struct btrfs_root *root);
  52 int write_all_supers(struct btrfs_root *root);
  53 int write_ctree_super(struct btrfs_trans_handle *trans,
  54                       struct btrfs_root *root);
  55 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr);
  56 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct extent_buffer *bh,
  57                             u64 logical);
  58 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  59                                             u64 bytenr, u32 blocksize);
  60 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
  61                                       struct btrfs_key *location);
  62 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
  63                                                struct btrfs_key *location);
  64 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
  65 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
  66 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
  67 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
  68 int wait_on_tree_block_writeback(struct btrfs_root *root,
  69                                  struct extent_buffer *buf);
  70 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
  71 void btrfs_csum_final(u32 crc, char *result);
  72
  73 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
  74                              struct btrfs_root *root);
  75 int btrfs_open_device(struct btrfs_device *dev);
  76 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
  77                          int verify);
  78 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
  79                     int verify);
  80 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
  81 #endif