[deliverable/linux.git] / drivers / md / multipath.h

#ifndef _MULTIPATH_H
#define _MULTIPATH_H

struct multipath_info {
	mdk_rdev_t	*rdev;
};

struct multipath_private_data {
	mddev_t			*mddev;
	struct multipath_info	*multipaths;
	int			raid_disks;
	int			working_disks;
	spinlock_t		device_lock;
	struct list_head	retry_list;

	mempool_t		*pool;
};

typedef struct multipath_private_data multipath_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) ((multipath_conf_t *) mddev->private)

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

struct multipath_bh {
	mddev_t			*mddev;
	struct bio		*master_bio;
	struct bio		bio;
	int			path;
	struct list_head	retry_list;
};
#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _MULTIPATH_H
	2	#define _MULTIPATH_H
	3
1da177e4 LT	4	struct multipath_info {
	5	mdk_rdev_t *rdev;
	6	};
	7
	8	struct multipath_private_data {
	9	mddev_t *mddev;
	10	struct multipath_info *multipaths;
	11	int raid_disks;
	12	int working_disks;
	13	spinlock_t device_lock;
	14	struct list_head retry_list;
	15
	16	mempool_t *pool;
	17	};
	18
	19	typedef struct multipath_private_data multipath_conf_t;
	20
	21	/*
	22	* this is the only point in the RAID code where we violate
	23	* C type safety. mddev->private is an 'opaque' pointer.
	24	*/
	25	#define mddev_to_conf(mddev) ((multipath_conf_t *) mddev->private)
	26
	27	/*
	28	* this is our 'private' 'collective' MULTIPATH buffer head.
	29	* it contains information about what kind of IO operations were started
	30	* for this MULTIPATH operation, and about their status:
	31	*/
	32
	33	struct multipath_bh {
	34	mddev_t *mddev;
	35	struct bio *master_bio;
	36	struct bio bio;
	37	int path;
	38	struct list_head retry_list;
	39	};
	40	#endif