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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/fs/btrfs/disk-io.h
15109 views
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/*

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 * Copyright (C) 2007 Oracle.  All rights reserved.

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 *

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 * This program is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU General Public

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 * License v2 as published by the Free Software Foundation.

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 *

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 * This program is distributed in the hope that it will be useful,

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 * but WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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 * General Public License for more details.

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 *

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 * You should have received a copy of the GNU General Public

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 * License along with this program; if not, write to the

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 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

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 * Boston, MA 021110-1307, USA.

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 */

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#ifndef __DISKIO__

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#define __DISKIO__

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#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)

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#define BTRFS_SUPER_INFO_SIZE 4096

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#define BTRFS_SUPER_MIRROR_MAX	 3

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#define BTRFS_SUPER_MIRROR_SHIFT 12

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static inline u64 btrfs_sb_offset(int mirror)

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{

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	u64 start = 16 * 1024;

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	if (mirror)

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		return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);

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	return BTRFS_SUPER_INFO_OFFSET;

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}

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struct btrfs_device;

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struct btrfs_fs_devices;

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struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,

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				      u32 blocksize, u64 parent_transid);

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int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,

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			 u64 parent_transid);

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struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,

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						   u64 bytenr, u32 blocksize);

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int clean_tree_block(struct btrfs_trans_handle *trans,

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		     struct btrfs_root *root, struct extent_buffer *buf);

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struct btrfs_root *open_ctree(struct super_block *sb,

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			      struct btrfs_fs_devices *fs_devices,

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			      char *options);

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int close_ctree(struct btrfs_root *root);

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int write_ctree_super(struct btrfs_trans_handle *trans,

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		      struct btrfs_root *root, int max_mirrors);

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struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);

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int btrfs_commit_super(struct btrfs_root *root);

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int btrfs_error_commit_super(struct btrfs_root *root);

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struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,

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					    u64 bytenr, u32 blocksize);

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struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,

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					       struct btrfs_key *location);

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struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,

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					      struct btrfs_key *location);

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int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);

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void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);

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void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);

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int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);

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void btrfs_mark_buffer_dirty(struct extent_buffer *buf);

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int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);

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int btrfs_set_buffer_uptodate(struct extent_buffer *buf);

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int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);

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u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);

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void btrfs_csum_final(u32 crc, char *result);

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int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,

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			int metadata);

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int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,

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			int rw, struct bio *bio, int mirror_num,

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			unsigned long bio_flags, u64 bio_offset,

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			extent_submit_bio_hook_t *submit_bio_start,

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			extent_submit_bio_hook_t *submit_bio_done);

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unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);

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int btrfs_write_tree_block(struct extent_buffer *buf);

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int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);

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int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,

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			     struct btrfs_fs_info *fs_info);

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int btrfs_add_log_tree(struct btrfs_trans_handle *trans,

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		       struct btrfs_root *root);

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int btree_lock_page_hook(struct page *page);

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#ifdef CONFIG_DEBUG_LOCK_ALLOC

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void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level);

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#else

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static inline void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb,

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						 int level)

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{

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}

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#endif

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#endif

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