[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / raid / raid10.h

#ifndef _RAID10_H
#define _RAID10_H

#include <linux/raid/md.h>

typedef struct mirror_info mirror_info_t;

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

typedef struct r10bio_s r10bio_t;

struct r10_private_data_s {
	mddev_t			*mddev;
	mirror_info_t		*mirrors;
	int			raid_disks;
	int			working_disks;
	spinlock_t		device_lock;

	/* geometry */
	int			near_copies;  /* number of copies layed out raid0 style */
	int 			far_copies;   /* number of copies layed out
					       * at large strides across drives
					       */
	int			copies;	      /* near_copies * far_copies.
					       * must be <= raid_disks
					       */
	sector_t		stride;	      /* distance between far copies.
					       * This is size / far_copies
					       */

	int chunk_shift; /* shift from chunks to sectors */
	sector_t chunk_mask;

	struct list_head	retry_list;
	/* queue pending writes and submit them on unplug */
	struct bio_list		pending_bio_list;


	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;

	mempool_t *r10bio_pool;
	mempool_t *r10buf_pool;
	struct page		*tmppage;
};

typedef struct r10_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' RAID10 bio.
 *
 * it contains information about what kind of IO operations were started
 * for this RAID10 operation, and about their status:
 */

struct r10bio_s {
	atomic_t		remaining; /* 'have we finished' count,
					    * used from IRQ handlers
					    */
	sector_t		sector;	/* virtual sector number */
	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_slot;

	struct list_head	retry_list;
	/*
	 * if the IO is in WRITE direction, then multiple bios are used,
	 * one for each copy.
	 * When resyncing we also use one for each copy.
	 * When reconstructing, we use 2 bios, one for read, one for write.
	 * We choose the number when they are allocated.
	 */
	struct {
		struct bio		*bio;
		sector_t addr;
		int devnum;
	} devs[0];
};

/* 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 r10bio.state */
#define	R10BIO_Uptodate	0
#define	R10BIO_IsSync	1
#define	R10BIO_IsRecover 2
#define	R10BIO_Degraded 3
#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _RAID10_H
	2	#define _RAID10_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	typedef struct r10bio_s r10bio_t;
	14
	15	struct r10_private_data_s {
	16	mddev_t *mddev;
	17	mirror_info_t *mirrors;
	18	int raid_disks;
	19	int working_disks;
	20	spinlock_t device_lock;
	21
	22	/* geometry */
	23	int near_copies; /* number of copies layed out raid0 style */
	24	int far_copies; /* number of copies layed out
	25	* at large strides across drives
	26	*/
	27	int copies; /* near_copies * far_copies.
	28	* must be <= raid_disks
	29	*/
	30	sector_t stride; /* distance between far copies.
	31	* This is size / far_copies
	32	*/
	33
	34	int chunk_shift; /* shift from chunks to sectors */
	35	sector_t chunk_mask;
	36
	37	struct list_head retry_list;
6cce3b23 N	38	/* queue pending writes and submit them on unplug */
	39	struct bio_list pending_bio_list;
	40
1da177e4 LT	41
	42	spinlock_t resync_lock;
	43	int nr_pending;
0a27ec96	44	int nr_waiting;
4443ae10	45	int nr_queued;
1da177e4 LT	46	int barrier;
1da177e4 LT	47	sector_t next_resync;
6cce3b23 N	48	int fullsync; /* set to 1 if a full sync is needed,
	49	* (fresh device added).
	50	* Cleared when a sync completes.
	51	*/
1da177e4	52
0a27ec96	53	wait_queue_head_t wait_barrier;
1da177e4 LT	54
	55	mempool_t *r10bio_pool;
	56	mempool_t *r10buf_pool;
4443ae10	57	struct page *tmppage;
1da177e4 LT	58	};
	59
	60	typedef struct r10_private_data_s conf_t;
	61
	62	/*
	63	* this is the only point in the RAID code where we violate
	64	* C type safety. mddev->private is an 'opaque' pointer.
	65	*/
	66	#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
	67
	68	/*
	69	* this is our 'private' RAID10 bio.
	70	*
	71	* it contains information about what kind of IO operations were started
	72	* for this RAID10 operation, and about their status:
	73	*/
	74
	75	struct r10bio_s {
	76	atomic_t remaining; /* 'have we finished' count,
	77	* used from IRQ handlers
	78	*/
	79	sector_t sector; /* virtual sector number */
	80	int sectors;
	81	unsigned long state;
	82	mddev_t *mddev;
	83	/*
	84	* original bio going to /dev/mdx
	85	*/
	86	struct bio *master_bio;
	87	/*
	88	* if the IO is in READ direction, then this is where we read
	89	*/
	90	int read_slot;
	91
	92	struct list_head retry_list;
	93	/*
	94	* if the IO is in WRITE direction, then multiple bios are used,
	95	* one for each copy.
	96	* When resyncing we also use one for each copy.
	97	* When reconstructing, we use 2 bios, one for read, one for write.
	98	* We choose the number when they are allocated.
	99	*/
	100	struct {
	101	struct bio *bio;
	102	sector_t addr;
	103	int devnum;
	104	} devs[0];
	105	};
	106
0eb3ff12 N	107	/* when we get a read error on a read-only array, we redirect to another
	108	* device without failing the first device, or trying to over-write to
	109	* correct the read error. To keep track of bad blocks on a per-bio
	110	* level, we store IO_BLOCKED in the appropriate 'bios' pointer
	111	*/
	112	#define IO_BLOCKED ((struct bio*)1)
	113
1da177e4 LT	114	/* bits for r10bio.state */
	115	#define R10BIO_Uptodate 0
	116	#define R10BIO_IsSync 1
	117	#define R10BIO_IsRecover 2
6cce3b23	118	#define R10BIO_Degraded 3
1da177e4	119	#endif