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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 static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh)
   9 {
  10         return (struct btrfs_node *)bh->b_data;
  11 }
  12
  13 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct buffer_head *bh)
  14 {
  15         return (struct btrfs_leaf *)bh->b_data;
  16 }
  17
  18 static inline struct btrfs_header *btrfs_buffer_header(struct buffer_head *bh)
  19 {
  20         return &((struct btrfs_node *)bh->b_data)->header;
  21 }
  22
  23 struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr);
  24 struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr);
  25 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  26                      struct buffer_head *buf);
  27 int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  28                      struct buffer_head *buf);
  29 int clean_tree_block(struct btrfs_trans_handle *trans,
  30                      struct btrfs_root *root, struct buffer_head *buf);
  31 int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root
  32                              *root, struct btrfs_super_block *s);
  33 struct btrfs_root *open_ctree(struct super_block *sb,
  34                               struct buffer_head *sb_buffer,
  35                               struct btrfs_super_block *disk_super);
  36 int close_ctree(struct btrfs_root *root);
  37 void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf);
  38 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  39                       struct btrfs_super_block *s);
  40 int mkfs(int fd, u64 num_blocks, u32 blocksize);
  41 #endif