1 #ifndef _MULTIPATH_H

     2 #define _MULTIPATH_H

     3 

     4 #include <linux/raid/md.h>

     5 

     6 struct multipath_info {

     7 	mdk_rdev_t	*rdev;

     8 };

     9 

    10 struct multipath_private_data {

    11 	mddev_t			*mddev;

    12 	struct multipath_info	*multipaths;

    13 	int			raid_disks;

    14 	int			working_disks;

    15 	spinlock_t		device_lock;

    16 	struct list_head	retry_list;

    17 

    18 	mempool_t		*pool;

    19 };

    20 

    21 typedef struct multipath_private_data multipath_conf_t;

    22 

    23 /*

    24  * this is the only point in the RAID code where we violate

    25  * C type safety. mddev->private is an 'opaque' pointer.

    26  */

    27 #define mddev_to_conf(mddev) ((multipath_conf_t *) mddev->private)

    28 

    29 /*

    30  * this is our 'private' 'collective' MULTIPATH buffer head.

    31  * it contains information about what kind of IO operations were started

    32  * for this MULTIPATH operation, and about their status:

    33  */

    34 

    35 struct multipath_bh {

    36 	mddev_t			*mddev;

    37 	struct bio		*master_bio;

    38 	struct bio		bio;

    39 	int			path;

    40 	struct list_head	retry_list;

    41 };

    42 #endif