[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_

#include <linux/bio.h>
#include "async-thread.h"

struct buffer_head;
struct btrfs_device {
	struct list_head dev_list;
	struct list_head dev_alloc_list;
	struct btrfs_fs_devices *fs_devices;
	struct btrfs_root *dev_root;
	struct buffer_head *pending_io;
	struct bio *pending_bios;
	struct bio *pending_bio_tail;
	int running_pending;
	u64 generation;

	int barriers;
	int writeable;
	int in_fs_metadata;

	spinlock_t io_lock;

	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_UUID_SIZE];

	struct btrfs_work work;
};

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 num_devices;
	u64 open_devices;
	u64 rw_devices;
	u64 total_rw_bytes;
	struct block_device *latest_bdev;
	/* all of the devices in the FS */
	struct list_head devices;

	/* devices not currently being allocated */
	struct list_head alloc_list;
	struct list_head list;

	struct btrfs_fs_devices *seed;
	int seeding;
	int sprouted;

	int opened;
};

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

struct btrfs_multi_bio {
	atomic_t stripes_pending;
	bio_end_io_t *end_io;
	struct bio *orig_bio;
	void *private;
	atomic_t error;
	int max_errors;
	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 start, u64 num_bytes);
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 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 async_submit);
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_close_extra_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_rm_device(struct btrfs_root *root, char *device_path);
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);
int btrfs_grow_device(struct btrfs_trans_handle *trans,
		      struct btrfs_device *device, u64 new_size);
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
				       u8 *uuid, u8 *fsid);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_root *root, char *path);
int btrfs_balance(struct btrfs_root *dev_root);
void btrfs_unlock_volumes(void);
void btrfs_lock_volumes(void);
int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
#endif
Commit	Line	Data
	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
	22	#include <linux/bio.h>
	23	#include "async-thread.h"
	24
	25	struct buffer_head;
	26	struct btrfs_device {
	27	struct list_head dev_list;
	28	struct list_head dev_alloc_list;
	29	struct btrfs_fs_devices *fs_devices;
	30	struct btrfs_root *dev_root;
	31	struct buffer_head *pending_io;
	32	struct bio *pending_bios;
	33	struct bio *pending_bio_tail;
	34	int running_pending;
	35	u64 generation;
	36
	37	int barriers;
	38	int writeable;
	39	int in_fs_metadata;
	40
	41	spinlock_t io_lock;
	42
	43	struct block_device *bdev;
	44
	45	char *name;
	46
	47	/* the internal btrfs device id */
	48	u64 devid;
	49
	50	/* size of the device */
	51	u64 total_bytes;
	52
	53	/* bytes used */
	54	u64 bytes_used;
	55
	56	/* optimal io alignment for this device */
	57	u32 io_align;
	58
	59	/* optimal io width for this device */
	60	u32 io_width;
	61
	62	/* minimal io size for this device */
	63	u32 sector_size;
	64
	65	/* type and info about this device */
	66	u64 type;
	67
	68	/* physical drive uuid (or lvm uuid) */
	69	u8 uuid[BTRFS_UUID_SIZE];
	70
	71	struct btrfs_work work;
	72	};
	73
	74	struct btrfs_fs_devices {
	75	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	76
	77	/* the device with this id has the most recent coyp of the super */
	78	u64 latest_devid;
	79	u64 latest_trans;
	80	u64 num_devices;
	81	u64 open_devices;
	82	u64 rw_devices;
	83	u64 total_rw_bytes;
	84	struct block_device *latest_bdev;
	85	/* all of the devices in the FS */
	86	struct list_head devices;
	87
	88	/* devices not currently being allocated */
	89	struct list_head alloc_list;
	90	struct list_head list;
	91
	92	struct btrfs_fs_devices *seed;
	93	int seeding;
	94	int sprouted;
	95
	96	int opened;
	97	};
	98
	99	struct btrfs_bio_stripe {
	100	struct btrfs_device *dev;
	101	u64 physical;
	102	};
	103
	104	struct btrfs_multi_bio {
	105	atomic_t stripes_pending;
	106	bio_end_io_t *end_io;
	107	struct bio *orig_bio;
	108	void *private;
	109	atomic_t error;
	110	int max_errors;
	111	int num_stripes;
	112	struct btrfs_bio_stripe stripes[];
	113	};
	114
	115	#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
	116	(sizeof(struct btrfs_bio_stripe) * (n)))
	117
	118	int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
	119	struct btrfs_device *device,
	120	u64 chunk_tree, u64 chunk_objectid,
	121	u64 chunk_offset, u64 start, u64 num_bytes);
	122	int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
	123	u64 logical, u64 *length,
	124	struct btrfs_multi_bio **multi_ret, int mirror_num);
	125	int btrfs_read_sys_array(struct btrfs_root *root);
	126	int btrfs_read_chunk_tree(struct btrfs_root *root);
	127	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
	128	struct btrfs_root *extent_root, u64 type);
	129	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
	130	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
	131	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio,
	132	int mirror_num, int async_submit);
	133	int btrfs_read_super_device(struct btrfs_root root, struct extent_buffer buf);
	134	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
	135	int flags, void *holder);
	136	int btrfs_scan_one_device(const char path, int flags, void holder,
	137	struct btrfs_fs_devices **fs_devices_ret);
	138	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
	139	int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
	140	int btrfs_add_device(struct btrfs_trans_handle *trans,
	141	struct btrfs_root *root,
	142	struct btrfs_device *device);
	143	int btrfs_rm_device(struct btrfs_root root, char device_path);
	144	int btrfs_cleanup_fs_uuids(void);
	145	int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
	146	int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
	147	u64 logical, struct page *page);
	148	int btrfs_grow_device(struct btrfs_trans_handle *trans,
	149	struct btrfs_device *device, u64 new_size);
	150	struct btrfs_device btrfs_find_device(struct btrfs_root root, u64 devid,
	151	u8 uuid, u8 fsid);
	152	int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
	153	int btrfs_init_new_device(struct btrfs_root root, char path);
	154	int btrfs_balance(struct btrfs_root *dev_root);
	155	void btrfs_unlock_volumes(void);
	156	void btrfs_lock_volumes(void);
	157	int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
	158	#endif