diff options
Diffstat (limited to 'drivers/md/multipath.h')
| -rw-r--r-- | drivers/md/multipath.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/md/multipath.h b/drivers/md/multipath.h new file mode 100644 index 00000000000..6fa70b400cd --- /dev/null +++ b/drivers/md/multipath.h @@ -0,0 +1,40 @@ +#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 |