include/linux/raid/multipath.h

   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
  17         mempool_t               *pool;
  18 };
  19
  20 typedef struct multipath_private_data multipath_conf_t;
  21
  22 /*
  23  * this is the only point in the RAID code where we violate
  24  * C type safety. mddev->private is an 'opaque' pointer.
  25  */
  26 #define mddev_to_conf(mddev) ((multipath_conf_t *) mddev->private)
  27
  28 /*
  29  * this is our 'private' 'collective' MULTIPATH buffer head.
  30  * it contains information about what kind of IO operations were started
  31  * for this MULTIPATH operation, and about their status:
  32  */
  33
  34 struct multipath_bh {
  35         mddev_t                 *mddev;
  36         struct bio              *master_bio;
  37         struct bio              bio;
  38         int                     path;
  39         struct multipath_bh     *next_mp; /* next for retry */
  40 };
  41 #endif