linux-kernel - [105/117] md/raid6: Fix raid-6 read-error correction in degraded state

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Message-Id: <20100510223326.862095522@kvm.kroah.org>
Date:	Mon, 10 May 2010 15:33:16 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Gabriele A. Trombetti" <g.trombetti.lkrnl1213@...icschema.com>,
	NeilBrown <neilb@...e.de>
Subject: [105/117] md/raid6: Fix raid-6 read-error correction in degraded state

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Gabriele A. Trombetti <g.trombetti.lkrnl1213@...icschema.com>

commit 87aa63000c484bfb9909989316f615240dfee018 upstream.

Fix: Raid-6 was not trying to correct a read-error when in
singly-degraded state and was instead dropping one more device, going to
doubly-degraded state. This patch fixes this behaviour.

Tested-by: Janos Haar <janos.haar@...center.hu>
Signed-off-by: Gabriele A. Trombetti <g.trombetti.lkrnl1213@...icschema.com>
Reported-by: Janos Haar <janos.haar@...center.hu>
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/md/raid5.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1526,7 +1526,7 @@ static void raid5_end_read_request(struc

 		clear_bit(R5_UPTODATE, &sh->dev[i].flags);
 		atomic_inc(&rdev->read_errors);
-		if (conf->mddev->degraded)
+		if (conf->mddev->degraded >= conf->max_degraded)
 			printk_rl(KERN_WARNING
 				  "raid5:%s: read error not correctable "
 				  "(sector %llu on %s).\n",

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