From: NeilBrown Date: Thu, 23 Jul 2015 23:22:16 +0000 (+1000) Subject: md/raid1: fix test for 'was read error from last working device'. X-Git-Tag: v4.2~142^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=34cab6f42003cb06f48f86a86652984dec338ae9;p=platform%2Fkernel%2Flinux-amlogic.git md/raid1: fix test for 'was read error from last working device'. 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 Fixes: 76073054c95b ("md/raid1: clean up read_balance.") Cc: stable@vger.kernel.org (v3.0+) Signed-off-by: NeilBrown --- diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index f80f1af..50cf0c8 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -336,7 +336,7 @@ 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); }