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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _RAID0_H3#define _RAID0_H4 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 to13 * the RAID0 layout for multi-zone arrays (where devices aren't all14 * the same size.15 * RAID0_ORIG_LAYOUT restores the original layout16 * RAID0_ALT_MULTIZONE_LAYOUT uses the altered layout17 * The layouts are identical when there is only one zone (all18 * 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 to28 * by strip_zone->dev */29 int nr_strip_zones;30 enum r0layout layout;31};32 33#endif34