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authorNeilBrown <neilb@suse.com>2015-07-24 09:22:16 +1000
committerBen Hutchings <ben@decadent.org.uk>2015-08-12 16:33:23 +0200
commitc6b1684f941a9fab8f2a23ba6610ae7306aabe1f (patch)
tree9e951ae8a77507e442c43356dda6ed1c31b0ab88
parent340f2018234cb04ac73095f3629fb57d890a0638 (diff)
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md/raid1: fix test for 'was read error from last working device'.
commit 34cab6f42003cb06f48f86a86652984dec338ae9 upstream. When we get a read error from the last working device, we don't try to repair it, and don't fail the device. We simple report a read error to the caller. However the current test for 'is this the last working device' is wrong. When there is only one fully working device, it assumes that a non-faulty device is that device. However a spare which is rebuilding would be non-faulty but so not the only working device. So change the test from "!Faulty" to "In_sync". If ->degraded says there is only one fully working device and this device is in_sync, this must be the one. This bug has existed since we allowed read_balance to read from a recovering spare in v3.0 Reported-and-tested-by: Alexander Lyakas <alex.bolshoy@gmail.com> Fixes: 76073054c95b ("md/raid1: clean up read_balance.") Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
-rw-r--r--drivers/md/raid1.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index aec029a..6e7b002 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -313,7 +313,7 @@ static void raid1_end_read_request(struct bio *bio, int error)
spin_lock_irqsave(&conf->device_lock, flags);
if (r1_bio->mddev->degraded == conf->raid_disks ||
(r1_bio->mddev->degraded == conf->raid_disks-1 &&
- !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags)))
+ test_bit(In_sync, &conf->mirrors[mirror].rdev->flags)))
uptodate = 1;
spin_unlock_irqrestore(&conf->device_lock, flags);
}