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   1 #ifndef __DISKIO__
   2 #define __DISKIO__
   3
   4 #include <linux/buffer_head.h>
   5
   6 #define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
   7
   8 enum btrfs_bh_state_bits {
   9         BH_Checked = BH_PrivateStart,
  10 };
  11 BUFFER_FNS(Checked, checked);
  12
  13 static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh)
  14 {
  15         return (struct btrfs_node *)bh->b_data;
  16 }
  17
  18 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct buffer_head *bh)
  19 {
  20         return (struct btrfs_leaf *)bh->b_data;
  21 }
  22
  23 static inline struct btrfs_header *btrfs_buffer_header(struct buffer_head *bh)
  24 {
  25         return &((struct btrfs_node *)bh->b_data)->header;
  26 }
  27
  28 struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr);
  29 int readahead_tree_block(struct btrfs_root *root, u64 blocknr);
  30 struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root,
  31                                                  u64 blocknr);
  32 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  33                      struct buffer_head *buf);
  34 int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  35                      struct buffer_head *buf);
  36 int clean_tree_block(struct btrfs_trans_handle *trans,
  37                      struct btrfs_root *root, struct buffer_head *buf);
  38 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
  39                              struct btrfs_root *root);
  40 struct btrfs_root *open_ctree(struct super_block *sb);
  41 int close_ctree(struct btrfs_root *root);
  42 void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf);
  43 int write_ctree_super(struct btrfs_trans_handle *trans,
  44                       struct btrfs_root *root);
  45 struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr);
  46 int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
  47                     char *result);
  48 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
  49                                       struct btrfs_key *location);
  50 u64 bh_blocknr(struct buffer_head *bh);
  51 int btrfs_insert_dev_radix(struct btrfs_root *root,
  52                            struct block_device *bdev,
  53                            u64 device_id,
  54                            u64 block_start,
  55                            u64 num_blocks);
  56 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,
  57                              u64 logical);
  58 #endif