| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _RAID0_H |
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| 3 | #define _RAID0_H |
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| 4 | |
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| 5 | struct strip_zone { |
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| 6 | sector_t zone_end; /* Start of the next zone (in sectors) */ |
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| 7 | sector_t dev_start; /* Zone offset in real dev (in sectors) */ |
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| 8 | int nb_dev; /* # of devices attached to the zone */ |
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| 9 | int disk_shift; /* start disk for the original layout */ |
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| 10 | }; |
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| 11 | |
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| 12 | /* Linux 3.14 (20d0189b101) made an unintended change to |
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| 13 | * the RAID0 layout for multi-zone arrays (where devices aren't all |
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| 14 | * the same size. |
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| 15 | * RAID0_ORIG_LAYOUT restores the original layout |
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| 16 | * RAID0_ALT_MULTIZONE_LAYOUT uses the altered layout |
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| 17 | * The layouts are identical when there is only one zone (all |
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| 18 | * devices the same size). |
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| 19 | */ |
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| 20 | |
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| 21 | enum r0layout { |
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| 22 | RAID0_ORIG_LAYOUT = 1, |
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| 23 | RAID0_ALT_MULTIZONE_LAYOUT = 2, |
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| 24 | }; |
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| 25 | struct r0conf { |
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| 26 | struct strip_zone *strip_zone; |
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| 27 | struct md_rdev **devlist; /* lists of rdevs, pointed to |
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| 28 | * by strip_zone->dev */ |
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| 29 | int nr_strip_zones; |
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| 30 | enum r0layout layout; |
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| 31 | }; |
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| 32 | |
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| 33 | #endif |
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| 34 | |
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