[net-next-2.6.git] / fs / btrfs / disk-io.h

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __DISKIO__
#define __DISKIO__

#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
#define BTRFS_SUPER_INFO_SIZE 4096

#define BTRFS_SUPER_MIRROR_MAX	 3
#define BTRFS_SUPER_MIRROR_SHIFT 12

static inline u64 btrfs_sb_offset(int mirror)
{
	u64 start = 16 * 1024;
	if (mirror)
		return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
	return BTRFS_SUPER_INFO_OFFSET;
}

struct btrfs_device;
struct btrfs_fs_devices;

struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
				      u32 blocksize, u64 parent_transid);
int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
			 u64 parent_transid);
struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
						   u64 bytenr, u32 blocksize);
int clean_tree_block(struct btrfs_trans_handle *trans,
		     struct btrfs_root *root, struct extent_buffer *buf);
struct btrfs_root *open_ctree(struct super_block *sb,
			      struct btrfs_fs_devices *fs_devices,
			      char *options);
int close_ctree(struct btrfs_root *root);
int write_ctree_super(struct btrfs_trans_handle *trans,
		      struct btrfs_root *root, int max_mirrors);
struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
int btrfs_commit_super(struct btrfs_root *root);
struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
					    u64 bytenr, u32 blocksize);
struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
					u64 root_objectid);
struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
				      struct btrfs_key *location,
				      const char *name, int namelen);
struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
					       struct btrfs_key *location);
struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
					      struct btrfs_key *location);
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
int btrfs_insert_dev_radix(struct btrfs_root *root,
			   struct block_device *bdev,
			   u64 device_id,
			   u64 block_start,
			   u64 num_blocks);
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
void btrfs_mark_buffer_dirty_nonblocking(struct extent_buffer *buf);
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
int wait_on_tree_block_writeback(struct btrfs_root *root,
				 struct extent_buffer *buf);
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
void btrfs_csum_final(u32 crc, char *result);
int btrfs_open_device(struct btrfs_device *dev);
int btrfs_verify_block_csum(struct btrfs_root *root,
			    struct extent_buffer *buf);
int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
			int metadata);
int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
			int rw, struct bio *bio, int mirror_num,
			unsigned long bio_flags, u64 bio_offset,
			extent_submit_bio_hook_t *submit_bio_start,
			extent_submit_bio_hook_t *submit_bio_done);

int btrfs_congested_async(struct btrfs_fs_info *info, int iodone);
unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
int btrfs_write_tree_block(struct extent_buffer *buf);
int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
			     struct btrfs_fs_info *fs_info);
int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
		       struct btrfs_root *root);
int btree_lock_page_hook(struct page *page);


#ifdef CONFIG_DEBUG_LOCK_ALLOC
void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level);
#else
static inline void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb,
						 int level)
{
}
#endif
#endif
Commit	Line	Data
6cbd5570 CM	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
eb60ceac CM	19	#ifndef __DISKIO__
	20	#define __DISKIO__
	21
a512bbf8	22	#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
f2984462	23	#define BTRFS_SUPER_INFO_SIZE 4096
a512bbf8 YZ	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
0b86a832	36	struct btrfs_device;
8a4b83cc	37	struct btrfs_fs_devices;
e20d96d6	38
db94535d	39	struct extent_buffer read_tree_block(struct btrfs_root root, u64 bytenr,
ca7a79ad CM	40	u32 blocksize, u64 parent_transid);
	41	int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
	42	u64 parent_transid);
5f39d397	43	struct extent_buffer btrfs_find_create_tree_block(struct btrfs_root root,
db94535d	44	u64 bytenr, u32 blocksize);
e089f05c	45	int clean_tree_block(struct btrfs_trans_handle *trans,
5f39d397	46	struct btrfs_root root, struct extent_buffer buf);
8a4b83cc	47	struct btrfs_root open_ctree(struct super_block sb,
dfe25020 CM	48	struct btrfs_fs_devices *fs_devices,
dfe25020 CM	49	char *options);
e20d96d6	50	int close_ctree(struct btrfs_root *root);
79154b1b	51	int write_ctree_super(struct btrfs_trans_handle *trans,
a512bbf8 YZ	52	struct btrfs_root *root, int max_mirrors);
a512bbf8 YZ	53	struct buffer_head btrfs_read_dev_super(struct block_device bdev);
c146afad	54	int btrfs_commit_super(struct btrfs_root *root);
5f39d397	55	struct extent_buffer btrfs_find_tree_block(struct btrfs_root root,
db94535d	56	u64 bytenr, u32 blocksize);
dc17ff8f CM	57	struct btrfs_root btrfs_lookup_fs_root(struct btrfs_fs_info fs_info,
dc17ff8f CM	58	u64 root_objectid);
0f7d52f4	59	struct btrfs_root btrfs_read_fs_root(struct btrfs_fs_info fs_info,
58176a96 JB	60	struct btrfs_key *location,
58176a96 JB	61	const char *name, int namelen);
e02119d5	62	struct btrfs_root btrfs_read_fs_root_no_radix(struct btrfs_root tree_root,
5eda7b5e	63	struct btrfs_key *location);
edbd8d4e CM	64	struct btrfs_root btrfs_read_fs_root_no_name(struct btrfs_fs_info fs_info,
edbd8d4e CM	65	struct btrfs_key *location);
c146afad	66	int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
8352d8a4 CM	67	int btrfs_insert_dev_radix(struct btrfs_root *root,
8352d8a4 CM	68	struct block_device *bdev,
b4100d64	69	u64 device_id,
8352d8a4 CM	70	u64 block_start,
8352d8a4 CM	71	u64 num_blocks);
d3c2fdcf	72	void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
5eda7b5e	73	int btrfs_free_fs_root(struct btrfs_fs_info fs_info, struct btrfs_root root);
5f39d397	74	void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
b9473439	75	void btrfs_mark_buffer_dirty_nonblocking(struct extent_buffer *buf);
1259ab75	76	int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
5f39d397 CM	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);
ca7a79ad	80	int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
ff79f819 CM	81	u32 btrfs_csum_data(struct btrfs_root root, char data, u32 seed, size_t len);
ff79f819 CM	82	void btrfs_csum_final(u32 crc, char *result);
0b86a832	83	int btrfs_open_device(struct btrfs_device *dev);
0999df54 CM	84	int btrfs_verify_block_csum(struct btrfs_root *root,
0999df54 CM	85	struct extent_buffer *buf);
22c59948 CM	86	int btrfs_bio_wq_end_io(struct btrfs_fs_info info, struct bio bio,
22c59948 CM	87	int metadata);
44b8bd7e CM	88	int btrfs_wq_submit_bio(struct btrfs_fs_info fs_info, struct inode inode,
44b8bd7e CM	89	int rw, struct bio *bio, int mirror_num,
eaf25d93	90	unsigned long bio_flags, u64 bio_offset,
4a69a410 CM	91	extent_submit_bio_hook_t *submit_bio_start,
	92	extent_submit_bio_hook_t *submit_bio_done);
	93
777e6bd7	94	int btrfs_congested_async(struct btrfs_fs_info *info, int iodone);
b64a2851	95	unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
e02119d5 CM	96	int btrfs_write_tree_block(struct extent_buffer *buf);
e02119d5 CM	97	int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
e02119d5 CM	98	int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
e02119d5 CM	99	struct btrfs_fs_info *fs_info);
7237f183 YZ	100	int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
7237f183 YZ	101	struct btrfs_root *root);
4bef0848	102	int btree_lock_page_hook(struct page *page);
4008c04a CM	103
	104
	105	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	106	void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level);
	107	#else
	108	static inline void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb,
	109	int level)
	110	{
	111	}
	112	#endif
eb60ceac	113	#endif