fs/btrfs/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 #include <linux/buffer_head.h>
  23
  24 #define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
  25
  26 enum btrfs_bh_state_bits {
  27         BH_Checked = BH_PrivateStart,
  28         BH_Defrag,
  29 };
  30 BUFFER_FNS(Checked, checked);
  31 BUFFER_FNS(Defrag, defrag);
  32
  33 static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh)
  34 {
  35         return (struct btrfs_node *)bh->b_data;
  36 }
  37
  38 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct buffer_head *bh)
  39 {
  40         return (struct btrfs_leaf *)bh->b_data;
  41 }
  42
  43 static inline struct btrfs_header *btrfs_buffer_header(struct buffer_head *bh)
  44 {
  45         return &((struct btrfs_node *)bh->b_data)->header;
  46 }
  47
  48 struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr);
  49 int readahead_tree_block(struct btrfs_root *root, u64 blocknr);
  50 struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root,
  51                                                  u64 blocknr);
  52 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  53                      struct buffer_head *buf);
  54 int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
  55                      struct buffer_head *buf);
  56 int clean_tree_block(struct btrfs_trans_handle *trans,
  57                      struct btrfs_root *root, struct buffer_head *buf);
  58 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
  59                              struct btrfs_root *root);
  60 struct btrfs_root *open_ctree(struct super_block *sb);
  61 int close_ctree(struct btrfs_root *root);
  62 void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf);
  63 int write_ctree_super(struct btrfs_trans_handle *trans,
  64                       struct btrfs_root *root);
  65 struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr);
  66 int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
  67                     char *result);
  68 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
  69                                       struct btrfs_key *location);
  70 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
  71                                                struct btrfs_key *location);
  72 u64 bh_blocknr(struct buffer_head *bh);
  73 int btrfs_insert_dev_radix(struct btrfs_root *root,
  74                            struct block_device *bdev,
  75                            u64 device_id,
  76                            u64 block_start,
  77                            u64 num_blocks);
  78 int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,
  79                              u64 logical);
  80 int btrfs_releasepage(struct page *page, gfp_t flags);
  81 void btrfs_btree_balance_dirty(struct btrfs_root *root);
  82 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
  83 void btrfs_mark_buffer_dirty(struct buffer_head *bh);
  84 #endif