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md/raid10: fix refounct imbalance when resyncing an array with a replacement device.

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If you have a raid10 with a replacement device that is resyncing -
e.g. after a crash before the replacement was complete - the write to
the replacement will increment nr_pending on the wrong device, which
will lead to strangeness.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2016-06-02 16:19:52 +10:00 committed by Shaohua Li
parent 414e6b9a70
commit 83f1261f5e
1 changed files with 1 additions and 1 deletions
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2
drivers/md/raid10.c
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@ -3229,7 +3229,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
bio->bi_error = -EIO;
sector = r10_bio->devs[i].addr;
atomic_inc(&conf->mirrors[d].rdev->nr_pending);
atomic_inc(&conf->mirrors[d].replacement->nr_pending);
bio->bi_next = biolist;
biolist = bio;
bio->bi_private = r10_bio;