LXR linux/drivers/md/raid0.h

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