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#ifndef _MULTIPATH_H
#define _MULTIPATH_H
#include <linux/raid/md.h>
#include <linux/bio.h>
struct multipath_info {
struct block_device *bdev;
/*
* State bits:
*/
int operational;
int used_slot;
};
struct multipath_private_data {
mddev_t *mddev;
struct multipath_info multipaths[MD_SB_DISKS];
int raid_disks;
int working_disks;
mdk_thread_t *thread;
spinlock_t device_lock;
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 multipath_bh *next_mp; /* next for retry */
};
#endif
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