[linux-2.6-block.git] / include / linux / raid / raid1.h

#ifndef _RAID1_H
#define _RAID1_H

#include <linux/raid/md.h>

typedef struct mirror_info mirror_info_t;

struct mirror_info {
	mdk_rdev_t	*rdev;
	sector_t	head_position;
};

/*
 * memory pools need a pointer to the mddev, so they can force an unplug
 * when memory is tight, and a count of the number of drives that the
 * pool was allocated for, so they know how much to allocate and free.
 * mddev->raid_disks cannot be used, as it can change while a pool is active
 * These two datums are stored in a kmalloced struct.
 */

struct pool_info {
	mddev_t *mddev;
	int	raid_disks;
};


typedef struct r1bio_s r1bio_t;

struct r1_private_data_s {
	mddev_t			*mddev;
	mirror_info_t		*mirrors;
	int			raid_disks;
	int			working_disks;
	int			last_used;
	sector_t		next_seq_sect;
	spinlock_t		device_lock;

	struct list_head	retry_list;
	/* queue pending writes and submit them on unplug */
	struct bio_list		pending_bio_list;
	/* queue of writes that have been unplugged */
	struct bio_list		flushing_bio_list;

	/* for use when syncing mirrors: */

	spinlock_t		resync_lock;
	int			nr_pending;
	int			barrier;
	sector_t		next_resync;
	int			fullsync;  /* set to 1 if a full sync is needed,
					    * (fresh device added).
					    * Cleared when a sync completes.
					    */

	wait_queue_head_t	wait_idle;
	wait_queue_head_t	wait_resume;

	struct pool_info	*poolinfo;

	mempool_t *r1bio_pool;
	mempool_t *r1buf_pool;
};

typedef struct r1_private_data_s conf_t;

/*
 * this is the only point in the RAID code where we violate
 * C type safety. mddev->private is an 'opaque' pointer.
 */
#define mddev_to_conf(mddev) ((conf_t *) mddev->private)

/*
 * this is our 'private' RAID1 bio.
 *
 * it contains information about what kind of IO operations were started
 * for this RAID1 operation, and about their status:
 */

struct r1bio_s {
	atomic_t		remaining; /* 'have we finished' count,
					    * used from IRQ handlers
					    */
	atomic_t		behind_remaining; /* number of write-behind ios remaining
						 * in this BehindIO request
						 */
	sector_t		sector;
	int			sectors;
	unsigned long		state;
	mddev_t			*mddev;
	/*
	 * original bio going to /dev/mdx
	 */
	struct bio		*master_bio;
	/*
	 * if the IO is in READ direction, then this is where we read
	 */
	int			read_disk;

	struct list_head	retry_list;
	struct bitmap_update	*bitmap_update;
	/*
	 * if the IO is in WRITE direction, then multiple bios are used.
	 * We choose the number when they are allocated.
	 */
	struct bio		*bios[0];
	/* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
};

/* bits for r1bio.state */
#define	R1BIO_Uptodate	0
#define	R1BIO_IsSync	1
#define	R1BIO_Degraded	2
#define	R1BIO_BehindIO   3
/* For write-behind requests, we call bi_end_io when
 * the last non-write-behind device completes, providing
 * any write was successful.  Otherwise we call when
 * any write-behind write succeeds, otherwise we call
 * with failure when last write completes (and all failed).
 * Record that bi_end_io was called with this flag...
 */
#define	R1BIO_Returned 4

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _RAID1_H
	2	#define _RAID1_H
	3
	4	#include <linux/raid/md.h>
	5
	6	typedef struct mirror_info mirror_info_t;
	7
	8	struct mirror_info {
	9	mdk_rdev_t *rdev;
	10	sector_t head_position;
	11	};
	12
	13	/*
	14	* memory pools need a pointer to the mddev, so they can force an unplug
	15	* when memory is tight, and a count of the number of drives that the
	16	* pool was allocated for, so they know how much to allocate and free.
	17	* mddev->raid_disks cannot be used, as it can change while a pool is active
	18	* These two datums are stored in a kmalloced struct.
	19	*/
	20
	21	struct pool_info {
	22	mddev_t *mddev;
	23	int raid_disks;
	24	};
	25
	26
	27	typedef struct r1bio_s r1bio_t;
	28
	29	struct r1_private_data_s {
	30	mddev_t *mddev;
	31	mirror_info_t *mirrors;
	32	int raid_disks;
	33	int working_disks;
	34	int last_used;
	35	sector_t next_seq_sect;
	36	spinlock_t device_lock;
	37
	38	struct list_head retry_list;
191ea9b2 N	39	/* queue pending writes and submit them on unplug */
	40	struct bio_list pending_bio_list;
	41	/* queue of writes that have been unplugged */
	42	struct bio_list flushing_bio_list;
	43
1da177e4 LT	44	/* for use when syncing mirrors: */
	45
	46	spinlock_t resync_lock;
191ea9b2 N	47	int nr_pending;
191ea9b2 N	48	int barrier;
1da177e4	49	sector_t next_resync;
191ea9b2 N	50	int fullsync; /* set to 1 if a full sync is needed,
	51	* (fresh device added).
	52	* Cleared when a sync completes.
	53	*/
1da177e4 LT	54
	55	wait_queue_head_t wait_idle;
	56	wait_queue_head_t wait_resume;
	57
	58	struct pool_info *poolinfo;
	59
	60	mempool_t *r1bio_pool;
	61	mempool_t *r1buf_pool;
	62	};
	63
	64	typedef struct r1_private_data_s conf_t;
	65
	66	/*
	67	* this is the only point in the RAID code where we violate
	68	* C type safety. mddev->private is an 'opaque' pointer.
	69	*/
	70	#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
	71
	72	/*
	73	* this is our 'private' RAID1 bio.
	74	*
	75	* it contains information about what kind of IO operations were started
	76	* for this RAID1 operation, and about their status:
	77	*/
	78
	79	struct r1bio_s {
	80	atomic_t remaining; /* 'have we finished' count,
	81	* used from IRQ handlers
	82	*/
4b6d287f N	83	atomic_t behind_remaining; /* number of write-behind ios remaining
	84	* in this BehindIO request
	85	*/
1da177e4 LT	86	sector_t sector;
	87	int sectors;
	88	unsigned long state;
	89	mddev_t *mddev;
	90	/*
	91	* original bio going to /dev/mdx
	92	*/
	93	struct bio *master_bio;
	94	/*
	95	* if the IO is in READ direction, then this is where we read
	96	*/
	97	int read_disk;
	98
	99	struct list_head retry_list;
191ea9b2	100	struct bitmap_update *bitmap_update;
1da177e4 LT	101	/*
	102	* if the IO is in WRITE direction, then multiple bios are used.
	103	* We choose the number when they are allocated.
	104	*/
	105	struct bio *bios[0];
191ea9b2	106	/* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
1da177e4 LT	107	};
	108
	109	/* bits for r1bio.state */
	110	#define R1BIO_Uptodate 0
	111	#define R1BIO_IsSync 1
191ea9b2	112	#define R1BIO_Degraded 2
4b6d287f N	113	#define R1BIO_BehindIO 3
	114	/* For write-behind requests, we call bi_end_io when
	115	* the last non-write-behind device completes, providing
	116	* any write was successful. Otherwise we call when
	117	* any write-behind write succeeds, otherwise we call
	118	* with failure when last write completes (and all failed).
	119	* Record that bi_end_io was called with this flag...
	120	*/
	121	#define R1BIO_Returned 4
	122
1da177e4	123	#endif