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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 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
21enum r0layout {
22 RAID0_ORIG_LAYOUT = 1,
23 RAID0_ALT_MULTIZONE_LAYOUT = 2,
24};
25struct 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