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dm raid: fix activation of existing raid4/10 devices

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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: [email protected] # 4.8
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
This commit is contained in:
Heinz Mauelshagen 2016-10-17 21:20:07 +02:00 • committed by Mike Snitzer
commit b052b07c39
2 changed files with 8 additions and 5 deletions
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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.
1.9.0 Add support for RAID level takeover/reshape/region size
and set size reduction.
1.9.1 Fix activation of existing RAID 4/10 mapped devices