LXR linux/drivers/md/multipath.h

   1#ifndef _MULTIPATH_H
   2#define _MULTIPATH_H
   3
   4struct multipath_info {
   5        mdk_rdev_t      *rdev;
   6};
   7
   8struct 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
  19typedef 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
  33struct 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
  41