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
  28enum {
  29        BTRFS_WQ_ENDIO_DATA = 0,
  30        BTRFS_WQ_ENDIO_METADATA = 1,
  31        BTRFS_WQ_ENDIO_FREE_SPACE = 2,
  32        BTRFS_WQ_ENDIO_RAID56 = 3,
  33};
  34
  35static inline u64 btrfs_sb_offset(int mirror)
  36{
  37        u64 start = 16 * 1024;
  38        if (mirror)
  39                return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
  40        return BTRFS_SUPER_INFO_OFFSET;
  41}
  42
  43struct btrfs_device;
  44struct btrfs_fs_devices;
  45
  46struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
  47                                      u32 blocksize, u64 parent_transid);
  48int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  49                         u64 parent_transid);
  50int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
  51                         int mirror_num, struct extent_buffer **eb);
  52struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
  53                                                   u64 bytenr, u32 blocksize);
  54void clean_tree_block(struct btrfs_trans_handle *trans,
  55                      struct btrfs_root *root, struct extent_buffer *buf);
  56int open_ctree(struct super_block *sb,
  57               struct btrfs_fs_devices *fs_devices,
  58               char *options);
  59int close_ctree(struct btrfs_root *root);
  60int write_ctree_super(struct btrfs_trans_handle *trans,
  61                      struct btrfs_root *root, int max_mirrors);
  62struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
  63int btrfs_commit_super(struct btrfs_root *root);
  64struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
  65                                            u64 bytenr, u32 blocksize);
  66struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
  67                                               struct btrfs_key *location);
  68struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
  69                                              struct btrfs_key *location);
  70int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
  71void btrfs_btree_balance_dirty(struct btrfs_root *root);
  72void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
  73void btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
  74void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
  75int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
  76                          int atomic);
  77int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
  78int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
  79u32 btrfs_csum_data(char *data, u32 seed, size_t len);
  80void btrfs_csum_final(u32 crc, char *result);
  81int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
  82                        int metadata);
  83int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
  84                        int rw, struct bio *bio, int mirror_num,
  85                        unsigned long bio_flags, u64 bio_offset,
  86                        extent_submit_bio_hook_t *submit_bio_start,
  87                        extent_submit_bio_hook_t *submit_bio_done);
  88unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
  89int btrfs_write_tree_block(struct extent_buffer *buf);
  90int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
  91int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
  92                             struct btrfs_fs_info *fs_info);
  93int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
  94                       struct btrfs_root *root);
  95void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
  96                                  struct btrfs_root *root);
  97struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
  98                                     struct btrfs_fs_info *fs_info,
  99                                     u64 objectid);
 100int btree_lock_page_hook(struct page *page, void *data,
 101                                void (*flush_fn)(void *));
 102int btrfs_calc_num_tolerated_disk_barrier_failures(
 103        struct btrfs_fs_info *fs_info);
 104
 105#ifdef CONFIG_DEBUG_LOCK_ALLOC
 106void btrfs_init_lockdep(void);
 107void btrfs_set_buffer_lockdep_class(u64 objectid,
 108                                    struct extent_buffer *eb, int level);
 109#else
 110static inline void btrfs_init_lockdep(void)
 111{ }
 112static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
 113                                        struct extent_buffer *eb, int level)
 114{
 115}
 116#endif
 117#endif
 118