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md/raid10: fix that replacement cannot complete recovery after reassemble

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[ Upstream commit bda3153998 ]

During assemble, the spare marked for replacement is not checked.
conf->fullsync cannot be updated to be 1. As a result, recovery will
treat it as a clean array. All recovering sectors are skipped. Original
device is replaced with the not-recovered spare.

mdadm -C /dev/md0 -l10 -n4 -pn2 /dev/loop[0123]
mdadm /dev/md0 -a /dev/loop4
mdadm /dev/md0 --replace /dev/loop0
mdadm -S /dev/md0 # stop array during recovery

mdadm -A /dev/md0 /dev/loop[01234]

After reassemble, you can see recovery go on, but it completes
immediately. In fact, recovery is not actually processed.

To solve this problem, we just add the missing logics for replacment
spares. (In raid1.c or raid5.c, they have already been checked.)

Reported-by: Alex Chen <alexchen@synology.com>
Reviewed-by: Alex Wu <alexwu@synology.com>
Reviewed-by: Chung-Chiang Cheng <cccheng@synology.com>
Signed-off-by: BingJing Chang <bingjingc@synology.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
BingJing Chang 2018-06-28 18:40:11 +08:00 committed by Greg Kroah-Hartman
parent 94cac10c50
commit 601c226ea6
1 changed files with 7 additions and 0 deletions
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7
drivers/md/raid10.c
View file

@ -3754,6 +3754,13 @@ static int raid10_run(struct mddev *mddev)
disk->rdev->saved_raid_disk < 0)
conf->fullsync = 1;
}
if (disk->replacement &&
!test_bit(In_sync, &disk->replacement->flags) &&
disk->replacement->saved_raid_disk < 0) {
conf->fullsync = 1;
}
disk->recovery_disabled = mddev->recovery_disabled - 1;
}