[deliverable/linux.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			nr_waiting;
	int			nr_queued;
	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_barrier;

	struct pool_info	*poolinfo;

	struct page		*tmppage;

	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*/
};

/* when we get a read error on a read-only array, we redirect to another
 * device without failing the first device, or trying to over-write to
 * correct the read error.  To keep track of bad blocks on a per-bio
 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
 */
#define IO_BLOCKED ((struct bio*)1)

/* bits for r1bio.state */
#define	R1BIO_Uptodate	0
#define	R1BIO_IsSync	1
#define	R1BIO_Degraded	2
#define	R1BIO_BehindIO	3
#define	R1BIO_Barrier	4
#define R1BIO_BarrierRetry 5
/* 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	47	int nr_pending;
17999be4	48	int nr_waiting;
ddaf22ab	49	int nr_queued;
191ea9b2	50	int barrier;
1da177e4	51	sector_t next_resync;
191ea9b2 N	52	int fullsync; /* set to 1 if a full sync is needed,
	53	* (fresh device added).
	54	* Cleared when a sync completes.
	55	*/
1da177e4	56
17999be4	57	wait_queue_head_t wait_barrier;
1da177e4 LT	58
	59	struct pool_info *poolinfo;
	60
ddaf22ab N	61	struct page *tmppage;
ddaf22ab N	62
1da177e4 LT	63	mempool_t *r1bio_pool;
	64	mempool_t *r1buf_pool;
	65	};
	66
	67	typedef struct r1_private_data_s conf_t;
	68
	69	/*
	70	* this is the only point in the RAID code where we violate
	71	* C type safety. mddev->private is an 'opaque' pointer.
	72	*/
	73	#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
	74
	75	/*
	76	* this is our 'private' RAID1 bio.
	77	*
	78	* it contains information about what kind of IO operations were started
	79	* for this RAID1 operation, and about their status:
	80	*/
	81
	82	struct r1bio_s {
	83	atomic_t remaining; /* 'have we finished' count,
	84	* used from IRQ handlers
	85	*/
4b6d287f N	86	atomic_t behind_remaining; /* number of write-behind ios remaining
	87	* in this BehindIO request
	88	*/
1da177e4 LT	89	sector_t sector;
	90	int sectors;
	91	unsigned long state;
	92	mddev_t *mddev;
	93	/*
	94	* original bio going to /dev/mdx
	95	*/
	96	struct bio *master_bio;
	97	/*
	98	* if the IO is in READ direction, then this is where we read
	99	*/
	100	int read_disk;
	101
	102	struct list_head retry_list;
191ea9b2	103	struct bitmap_update *bitmap_update;
1da177e4 LT	104	/*
	105	* if the IO is in WRITE direction, then multiple bios are used.
	106	* We choose the number when they are allocated.
	107	*/
	108	struct bio *bios[0];
191ea9b2	109	/* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
1da177e4 LT	110	};
1da177e4 LT	111
cf30a473 N	112	/* when we get a read error on a read-only array, we redirect to another
	113	* device without failing the first device, or trying to over-write to
	114	* correct the read error. To keep track of bad blocks on a per-bio
	115	* level, we store IO_BLOCKED in the appropriate 'bios' pointer
	116	*/
	117	#define IO_BLOCKED ((struct bio*)1)
	118
1da177e4 LT	119	/* bits for r1bio.state */
	120	#define R1BIO_Uptodate 0
	121	#define R1BIO_IsSync 1
191ea9b2	122	#define R1BIO_Degraded 2
a9701a30 N	123	#define R1BIO_BehindIO 3
	124	#define R1BIO_Barrier 4
	125	#define R1BIO_BarrierRetry 5
4b6d287f N	126	/* For write-behind requests, we call bi_end_io when
	127	* the last non-write-behind device completes, providing
	128	* any write was successful. Otherwise we call when
	129	* any write-behind write succeeds, otherwise we call
	130	* with failure when last write completes (and all failed).
	131	* Record that bi_end_io was called with this flag...
	132	*/
	133	#define R1BIO_Returned 4
	134
1da177e4	135	#endif