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 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 56 u64 bytenr, u32 blocksize); 57 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 58 u64 root_objectid); 59 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, 60 struct btrfs_key *location, 61 const char *name, int namelen); 62 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, 63 struct btrfs_key *location); 64 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 65 struct btrfs_key *location); 66 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); 67 int btrfs_insert_dev_radix(struct btrfs_root *root, 68 struct block_device *bdev, 69 u64 device_id, 70 u64 block_start, 71 u64 num_blocks); 72 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr); 73 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root); 74 void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 75 void btrfs_mark_buffer_dirty_nonblocking(struct extent_buffer *buf); 76 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid); 77 int btrfs_set_buffer_uptodate(struct extent_buffer *buf); 78 int wait_on_tree_block_writeback(struct btrfs_root *root, 79 struct extent_buffer *buf); 80 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid); 81 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len); 82 void btrfs_csum_final(u32 crc, char *result); 83 int btrfs_open_device(struct btrfs_device *dev); 84 int btrfs_verify_block_csum(struct btrfs_root *root, 85 struct extent_buffer *buf); 86 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 87 int metadata); 88 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 89 int rw, struct bio *bio, int mirror_num, 90 unsigned long bio_flags, 91 extent_submit_bio_hook_t *submit_bio_start, 92 extent_submit_bio_hook_t *submit_bio_done); 93 94 int btrfs_congested_async(struct btrfs_fs_info *info, int iodone); 95 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info); 96 int btrfs_write_tree_block(struct extent_buffer *buf); 97 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf); 98 int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, 99 struct btrfs_fs_info *fs_info); 100 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 101 struct btrfs_fs_info *fs_info); 102 int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 103 struct btrfs_root *root); 104 int btree_lock_page_hook(struct page *page); 105 106 107 #ifdef CONFIG_DEBUG_LOCK_ALLOC 108 void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level); 109 #else 110 static inline void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, 111 int level) 112 { 113 } 114 #endif 115 #endif 116