linux/fs/btrfs/disk-io.h
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   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
  28static 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
  36struct btrfs_device;
  37struct btrfs_fs_devices;
  38
  39struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
  40                                      u32 blocksize, u64 parent_transid);
  41int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  42                         u64 parent_transid);
  43int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  44                         int mirror_num, struct extent_buffer **eb);
  45struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  46                                                   u64 bytenr, u32 blocksize);
  47void clean_tree_block(struct btrfs_trans_handle *trans,
  48                      struct btrfs_root *root, struct extent_buffer *buf);
  49int open_ctree(struct super_block *sb,
  50               struct btrfs_fs_devices *fs_devices,
  51               char *options);
  52int close_ctree(struct btrfs_root *root);
  53int write_ctree_super(struct btrfs_trans_handle *trans,
  54                      struct btrfs_root *root, int max_mirrors);
  55struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
  56int btrfs_commit_super(struct btrfs_root *root);
  57void btrfs_error_commit_super(struct btrfs_root *root);
  58struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  59                                            u64 bytenr, u32 blocksize);
  60struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
  61                                               struct btrfs_key *location);
  62struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
  63                                              struct btrfs_key *location);
  64int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
  65void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
  66void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
  67void btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
  68void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
  69int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
  70                          int atomic);
  71int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
  72int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
  73u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
  74void btrfs_csum_final(u32 crc, char *result);
  75int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
  76                        int metadata);
  77int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
  78                        int rw, struct bio *bio, int mirror_num,
  79                        unsigned long bio_flags, u64 bio_offset,
  80                        extent_submit_bio_hook_t *submit_bio_start,
  81                        extent_submit_bio_hook_t *submit_bio_done);
  82unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
  83int btrfs_write_tree_block(struct extent_buffer *buf);
  84int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
  85int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
  86                             struct btrfs_fs_info *fs_info);
  87int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
  88                       struct btrfs_root *root);
  89int btrfs_cleanup_transaction(struct btrfs_root *root);
  90void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
  91                                  struct btrfs_root *root);
  92void btrfs_abort_devices(struct btrfs_root *root);
  93struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
  94                                     struct btrfs_fs_info *fs_info,
  95                                     u64 objectid);
  96int btree_lock_page_hook(struct page *page, void *data,
  97                                void (*flush_fn)(void *));
  98
  99#ifdef CONFIG_DEBUG_LOCK_ALLOC
 100void btrfs_init_lockdep(void);
 101void btrfs_set_buffer_lockdep_class(u64 objectid,
 102                                    struct extent_buffer *eb, int level);
 103#else
 104static inline void btrfs_init_lockdep(void)
 105{ }
 106static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
 107                                        struct extent_buffer *eb, int level)
 108{
 109}
 110#endif
 111#endif
 112
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