LXR linux/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#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);
  43struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  44                                                   u64 bytenr, u32 blocksize);
  45int clean_tree_block(struct btrfs_trans_handle *trans,
  46                     struct btrfs_root *root, struct extent_buffer *buf);
  47struct btrfs_root *open_ctree(struct super_block *sb,
  48                              struct btrfs_fs_devices *fs_devices,
  49                              char *options);
  50int close_ctree(struct btrfs_root *root);
  51int write_ctree_super(struct btrfs_trans_handle *trans,
  52                      struct btrfs_root *root, int max_mirrors);
  53struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
  54int btrfs_commit_super(struct btrfs_root *root);
  55int btrfs_error_commit_super(struct btrfs_root *root);
  56struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  57                                            u64 bytenr, u32 blocksize);
  58struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
  59                                        u64 root_objectid);
  60struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
  61                                      struct btrfs_key *location,
  62                                      const char *name, int namelen);
  63struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
  64                                               struct btrfs_key *location);
  65struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
  66                                              struct btrfs_key *location);
  67int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
  68int btrfs_insert_dev_radix(struct btrfs_root *root,
  69                           struct block_device *bdev,
  70                           u64 device_id,
  71                           u64 block_start,
  72                           u64 num_blocks);
  73void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
  74int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
  75void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
  76void btrfs_mark_buffer_dirty_nonblocking(struct extent_buffer *buf);
  77int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
  78int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
  79int wait_on_tree_block_writeback(struct btrfs_root *root,
  80                                 struct extent_buffer *buf);
  81int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
  82u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
  83void btrfs_csum_final(u32 crc, char *result);
  84int btrfs_open_device(struct btrfs_device *dev);
  85int btrfs_verify_block_csum(struct btrfs_root *root,
  86                            struct extent_buffer *buf);
  87int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
  88                        int metadata);
  89int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
  90                        int rw, struct bio *bio, int mirror_num,
  91                        unsigned long bio_flags, u64 bio_offset,
  92                        extent_submit_bio_hook_t *submit_bio_start,
  93                        extent_submit_bio_hook_t *submit_bio_done);
  94
  95int btrfs_congested_async(struct btrfs_fs_info *info, int iodone);
  96unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
  97int btrfs_write_tree_block(struct extent_buffer *buf);
  98int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
  99int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
 100                             struct btrfs_fs_info *fs_info);
 101int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
 102                       struct btrfs_root *root);
 103int btree_lock_page_hook(struct page *page);
 104
 105
 106#ifdef CONFIG_DEBUG_LOCK_ALLOC
 107void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level);
 108#else
 109static inline void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb,
 110                                                 int level)
 111{
 112}
 113#endif
 114#endif
 115