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dm raid: fix activation of existing raid4/10 devices 

dm-raid 1.9.0 fails to activate existing RAID4/10 devices that have the
old superblock format (which does not have takeover/reshaping support
that was added via commit 33e53f0685).

Fix validation path for old superblocks by reverting to the old raid4
layout and basing checks on mddev->new_{level,layout,...} members in
super_init_validation().

Cc: stable@vger.kernel.org # 4.8
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Heinz Mauelshagen 2016-10-17 21:20:07 +02:00 коммит произвёл Mike Snitzer
Родитель 12a7cf5ba6
Коммит b052b07c39
2 изменённых файлов: 8 добавлений и 5 удалений
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1
Documentation/device-mapper/dm-raid.txt
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@ -309,3 +309,4 @@ Version History
with a reshape in progress. with a reshape in progress.
1.9.0 Add support for RAID level takeover/reshape/region size 1.9.0 Add support for RAID level takeover/reshape/region size
and set size reduction. and set size reduction.
1.9.1 Fix activation of existing RAID 4/10 mapped devices

12
drivers/md/dm-raid.c
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@ -266,7 +266,7 @@ static struct raid_type {
{"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET}, {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
{"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR}, {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
{"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT}, {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
{"raid4", "raid4 (dedicated last parity disk)", 1, 2, 4, ALGORITHM_PARITY_N}, /* raid4 layout = raid5_n */ {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */
{"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N}, {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
{"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
{"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
@ -2087,11 +2087,11 @@ static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
/* /*
* No takeover/reshaping, because we don't have the extended v1.9.0 metadata * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
*/ */
if (le32_to_cpu(sb->level) != mddev->level) { if (le32_to_cpu(sb->level) != mddev->new_level) {
DMERR("Reshaping/takeover raid sets not yet supported. (raid level/stripes/size change)"); DMERR("Reshaping/takeover raid sets not yet supported. (raid level/stripes/size change)");
return -EINVAL; return -EINVAL;
} }
if (le32_to_cpu(sb->layout) != mddev->layout) { if (le32_to_cpu(sb->layout) != mddev->new_layout) {
DMERR("Reshaping raid sets not yet supported. (raid layout change)"); DMERR("Reshaping raid sets not yet supported. (raid layout change)");
DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout);
DMERR(" Old layout: %s w/ %d copies", DMERR(" Old layout: %s w/ %d copies",
@ -2102,7 +2102,7 @@ static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
raid10_md_layout_to_copies(mddev->layout)); raid10_md_layout_to_copies(mddev->layout));
return -EINVAL; return -EINVAL;
} }
if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) { if (le32_to_cpu(sb->stripe_sectors) != mddev->new_chunk_sectors) {
DMERR("Reshaping raid sets not yet supported. (stripe sectors change)"); DMERR("Reshaping raid sets not yet supported. (stripe sectors change)");
return -EINVAL; return -EINVAL;
} }
@ -2115,6 +2115,8 @@ static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
return -EINVAL; return -EINVAL;
} }
DMINFO("Discovered old metadata format; upgrading to extended metadata format");
/* Table line is checked vs. authoritative superblock */ /* Table line is checked vs. authoritative superblock */
rs_set_new(rs); rs_set_new(rs);
} }
@ -3647,7 +3649,7 @@ static void raid_resume(struct dm_target *ti)
static struct target_type raid_target = { static struct target_type raid_target = {
.name = "raid", .name = "raid",
.version = {1, 9, 0}, .version = {1, 9, 1},
.module = THIS_MODULE, .module = THIS_MODULE,
.ctr = raid_ctr, .ctr = raid_ctr,
.dtr = raid_dtr, .dtr = raid_dtr,