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If the drives in a RAID0 are not all the same size, the array is
divided into zones.
The first zone covers all drives, to the size of the smallest.
The second zone covers all drives larger than the smallest, up to
the size of the second smallest - etc.
A change in Linux 3.14 unintentionally changed the layout for the
second and subsequent zones. All the correct data is still stored, but
each chunk may be assigned to a different device than in pre-3.14 kernels.
This can lead to data corruption.
It is not possible to determine what layout to use - it depends which
kernel the data was written by.
So we add a module parameter to allow the old (0) or new (1) layout to be
specified, and refused to assemble an affected array if that parameter is
not set.
Fixes: 20d0189b10 ("block: Introduce new bio_split()")
cc: stable@vger.kernel.org (3.14+)
Acked-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Song Liu <songliubraving@fb.com>
33 lines
892 B
C
33 lines
892 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _RAID0_H
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#define _RAID0_H
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struct strip_zone {
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sector_t zone_end; /* Start of the next zone (in sectors) */
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sector_t dev_start; /* Zone offset in real dev (in sectors) */
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int nb_dev; /* # of devices attached to the zone */
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};
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/* Linux 3.14 (20d0189b101) made an unintended change to
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* the RAID0 layout for multi-zone arrays (where devices aren't all
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* the same size.
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* RAID0_ORIG_LAYOUT restores the original layout
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* RAID0_ALT_MULTIZONE_LAYOUT uses the altered layout
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* The layouts are identical when there is only one zone (all
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* devices the same size).
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*/
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enum r0layout {
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RAID0_ORIG_LAYOUT = 1,
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RAID0_ALT_MULTIZONE_LAYOUT = 2,
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};
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struct r0conf {
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struct strip_zone *strip_zone;
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struct md_rdev **devlist; /* lists of rdevs, pointed to
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* by strip_zone->dev */
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int nr_strip_zones;
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enum r0layout layout;
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};
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#endif
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