drivers/md/raid0.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _RAID0_H
   3 #define _RAID0_H
   4
   5 struct strip_zone {
   6         sector_t zone_end;      /* Start of the next zone (in sectors) */
   7         sector_t dev_start;     /* Zone offset in real dev (in sectors) */
   8         int      nb_dev;        /* # of devices attached to the zone */
   9         int      disk_shift;    /* start disk for the original layout */
  10 };
  11
  12 /* Linux 3.14 (20d0189b101) made an unintended change to
  13  * the RAID0 layout for multi-zone arrays (where devices aren't all
  14  * the same size.
  15  * RAID0_ORIG_LAYOUT restores the original layout
  16  * RAID0_ALT_MULTIZONE_LAYOUT uses the altered layout
  17  * The layouts are identical when there is only one zone (all
  18  * devices the same size).
  19  */
  20
  21 enum r0layout {
  22         RAID0_ORIG_LAYOUT = 1,
  23         RAID0_ALT_MULTIZONE_LAYOUT = 2,
  24 };
  25 struct r0conf {
  26         struct strip_zone       *strip_zone;
  27         struct md_rdev          **devlist; /* lists of rdevs, pointed to
  28                                             * by strip_zone->dev */
  29         int                     nr_strip_zones;
  30         enum r0layout           layout;
  31 };
  32
  33 #endif