[linux-2.6-block.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_
struct btrfs_device {
	struct list_head dev_list;
	struct btrfs_root *dev_root;

	struct block_device *bdev;

	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_DEV_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;
};

int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
			   struct btrfs_device *device,
			   u64 owner, u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
		    u64 logical, u64 *phys, u64 *length,
		    struct btrfs_device **dev);
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 btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
		    u64 logical, u64 *phys, u64 *length,
		    struct btrfs_device **dev);
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);
#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_
	21	struct btrfs_device {
	22	struct list_head dev_list;
	23	struct btrfs_root *dev_root;
0b86a832 CM	24
	25	struct block_device *bdev;
	26
8a4b83cc CM	27	char *name;
8a4b83cc CM	28
0b86a832 CM	29	/* the internal btrfs device id */
	30	u64 devid;
	31
	32	/* size of the device */
	33	u64 total_bytes;
	34
	35	/* bytes used */
	36	u64 bytes_used;
	37
	38	/* optimal io alignment for this device */
	39	u32 io_align;
	40
	41	/* optimal io width for this device */
	42	u32 io_width;
	43
	44	/* minimal io size for this device */
	45	u32 sector_size;
	46
0b86a832 CM	47	/* type and info about this device */
	48	u64 type;
	49
0b86a832 CM	50	/* physical drive uuid (or lvm uuid) */
0b86a832 CM	51	u8 uuid[BTRFS_DEV_UUID_SIZE];
0b86a832 CM	52	};
0b86a832 CM	53
8a4b83cc CM	54	struct btrfs_fs_devices {
	55	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	56
	57	/* the device with this id has the most recent coyp of the super */
	58	u64 latest_devid;
	59	u64 latest_trans;
	60	u64 lowest_devid;
	61	u64 num_devices;
	62	struct block_device *latest_bdev;
	63	struct block_device *lowest_bdev;
	64	struct list_head devices;
	65	struct list_head list;
	66	};
	67
0b86a832 CM	68	int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
	69	struct btrfs_device *device,
	70	u64 owner, u64 num_bytes, u64 *start);
	71	int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
	72	u64 logical, u64 phys, u64 length,
	73	struct btrfs_device **dev);
	74	int btrfs_read_sys_array(struct btrfs_root *root);
	75	int btrfs_read_chunk_tree(struct btrfs_root *root);
	76	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
	77	struct btrfs_root extent_root, u64 start,
6324fbf3	78	u64 *num_bytes, u64 type);
0b86a832 CM	79	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
	80	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
	81	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio);
0d81ba5d	82	int btrfs_read_super_device(struct btrfs_root root, struct extent_buffer buf);
239b14b3 CM	83	int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
	84	u64 logical, u64 phys, u64 length,
	85	struct btrfs_device **dev);
8a4b83cc CM	86	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
	87	int flags, void *holder);
	88	int btrfs_scan_one_device(const char path, int flags, void holder,
	89	struct btrfs_fs_devices **fs_devices_ret);
	90	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
	91	int btrfs_add_device(struct btrfs_trans_handle *trans,
	92	struct btrfs_root *root,
	93	struct btrfs_device *device);
	94	int btrfs_cleanup_fs_uuids(void);
0b86a832	95	#endif