[deliverable/linux.git] / fs / btrfs / volumes.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 __BTRFS_VOLUMES_
#define __BTRFS_VOLUMES_

#include <linux/bio.h>

struct buffer_head;
struct btrfs_device {
	struct list_head dev_list;
	struct btrfs_root *dev_root;
	struct buffer_head *pending_io;
	int barriers;
	spinlock_t io_lock;

	struct block_device *bdev;

	u64 total_ios;

	char *name;

	/* the internal btrfs device id */
	u64 devid;

	/* size of the device */
	u64 total_bytes;

	/* bytes used */
	u64 bytes_used;

	/* optimal io alignment for this device */
	u32 io_align;

	/* optimal io width for this device */
	u32 io_width;

	/* minimal io size for this device */
	u32 sector_size;

	/* type and info about this device */
	u64 type;

	/* physical drive uuid (or lvm uuid) */
	u8 uuid[BTRFS_UUID_SIZE];
};

struct btrfs_fs_devices {
	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */

	/* the device with this id has the most recent coyp of the super */
	u64 latest_devid;
	u64 latest_trans;
	u64 lowest_devid;
	u64 num_devices;
	struct block_device *latest_bdev;
	struct block_device *lowest_bdev;
	struct list_head devices;
	struct list_head list;
};

struct btrfs_bio_stripe {
	struct btrfs_device *dev;
	u64 physical;
};

struct btrfs_multi_bio {
	atomic_t stripes_pending;
	bio_end_io_t *end_io;
	void *private;
	int error;
	int num_stripes;
	struct btrfs_bio_stripe stripes[];
};

#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
			    (sizeof(struct btrfs_bio_stripe) * (n)))

int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
			   struct btrfs_device *device,
			   u64 chunk_tree, u64 chunk_objectid,
			   u64 chunk_offset,
			   u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
		    u64 logical, u64 *length,
		    struct btrfs_multi_bio **multi_ret, int mirror_num);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
		      struct btrfs_root *extent_root, u64 *start,
		      u64 *num_bytes, u64 type);
void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
		  int mirror_num);
int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
		       int flags, void *holder);
int btrfs_scan_one_device(const char *path, int flags, void *holder,
			  struct btrfs_fs_devices **fs_devices_ret);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
int btrfs_add_device(struct btrfs_trans_handle *trans,
		     struct btrfs_root *root,
		     struct btrfs_device *device);
int btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
		      u64 logical, struct page *page);
#endif
Commit	Line	Data
0b86a832 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
	19	#ifndef __BTRFS_VOLUMES_
	20	#define __BTRFS_VOLUMES_
8790d502	21
cea9e445 CM	22	#include <linux/bio.h>
cea9e445 CM	23
f2984462	24	struct buffer_head;
0b86a832 CM	25	struct btrfs_device {
	26	struct list_head dev_list;
	27	struct btrfs_root *dev_root;
f2984462 CM	28	struct buffer_head *pending_io;
f2984462 CM	29	int barriers;
8790d502	30	spinlock_t io_lock;
0b86a832 CM	31
	32	struct block_device *bdev;
	33
8790d502 CM	34	u64 total_ios;
8790d502 CM	35
8a4b83cc CM	36	char *name;
8a4b83cc CM	37
0b86a832 CM	38	/* the internal btrfs device id */
	39	u64 devid;
	40
	41	/* size of the device */
	42	u64 total_bytes;
	43
	44	/* bytes used */
	45	u64 bytes_used;
	46
	47	/* optimal io alignment for this device */
	48	u32 io_align;
	49
	50	/* optimal io width for this device */
	51	u32 io_width;
	52
	53	/* minimal io size for this device */
	54	u32 sector_size;
	55
0b86a832 CM	56	/* type and info about this device */
	57	u64 type;
	58
0b86a832	59	/* physical drive uuid (or lvm uuid) */
e17cade2	60	u8 uuid[BTRFS_UUID_SIZE];
0b86a832 CM	61	};
0b86a832 CM	62
8a4b83cc CM	63	struct btrfs_fs_devices {
	64	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	65
	66	/* the device with this id has the most recent coyp of the super */
	67	u64 latest_devid;
	68	u64 latest_trans;
	69	u64 lowest_devid;
	70	u64 num_devices;
	71	struct block_device *latest_bdev;
	72	struct block_device *lowest_bdev;
	73	struct list_head devices;
	74	struct list_head list;
	75	};
	76
cea9e445 CM	77	struct btrfs_bio_stripe {
	78	struct btrfs_device *dev;
	79	u64 physical;
	80	};
	81
	82	struct btrfs_multi_bio {
	83	atomic_t stripes_pending;
	84	bio_end_io_t *end_io;
	85	void *private;
	86	int error;
	87	int num_stripes;
	88	struct btrfs_bio_stripe stripes[];
	89	};
	90
	91	#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
	92	(sizeof(struct btrfs_bio_stripe) * (n)))
	93
0b86a832 CM	94	int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
0b86a832 CM	95	struct btrfs_device *device,
e17cade2 CM	96	u64 chunk_tree, u64 chunk_objectid,
	97	u64 chunk_offset,
	98	u64 num_bytes, u64 *start);
cea9e445 CM	99	int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
cea9e445 CM	100	u64 logical, u64 *length,
f188591e	101	struct btrfs_multi_bio **multi_ret, int mirror_num);
0b86a832 CM	102	int btrfs_read_sys_array(struct btrfs_root *root);
	103	int btrfs_read_chunk_tree(struct btrfs_root *root);
	104	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
	105	struct btrfs_root extent_root, u64 start,
6324fbf3	106	u64 *num_bytes, u64 type);
0b86a832 CM	107	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
0b86a832 CM	108	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
f188591e CM	109	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio,
f188591e CM	110	int mirror_num);
0d81ba5d	111	int btrfs_read_super_device(struct btrfs_root root, struct extent_buffer buf);
8a4b83cc CM	112	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
	113	int flags, void *holder);
	114	int btrfs_scan_one_device(const char path, int flags, void holder,
	115	struct btrfs_fs_devices **fs_devices_ret);
	116	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
	117	int btrfs_add_device(struct btrfs_trans_handle *trans,
	118	struct btrfs_root *root,
	119	struct btrfs_device *device);
	120	int btrfs_cleanup_fs_uuids(void);
f188591e	121	int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
f2d8d74d CM	122	int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
f2d8d74d CM	123	u64 logical, struct page *page);
0b86a832	124	#endif