md: Whenassemble the array, consult the superblock of the freshest device

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Upon assembling the array, both kernel and mdadm allow the devices to have event
counter difference of 1, and still consider them as up-to-date.
However, a device whose event count is behind by 1, may in fact not be up-to-date,
and array resync with such a device may cause data corruption.
To avoid this, consult the superblock of the freshest device about the status
of a device, whose event counter is behind by 1.

Signed-off-by: Alex Lyakas <alex.lyakas@zadara.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/1702470271-16073-1-git-send-email-alex.lyakas@zadara.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alex Lyakas 2023-12-13 14:24:31 +02:00 • committed by Greg Kroah-Hartman

parent 8ae4201900

commit fd9a2c7003

1 changed files with 44 additions and 10 deletions

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drivers/md/md.c

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