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