drivers/md/multipath.h

   1 #ifndef _MULTIPATH_H
   2 #define _MULTIPATH_H
   3
   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