linux-kernel - [PATCH] [90/223] md/raid1: really fix recovery looping when single good device fails.

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Date:	Mon, 13 Dec 2010 00:46:29 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	neilb@...e.de, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [90/223] md/raid1: really fix recovery looping when single good device fails.

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: NeilBrown <neilb@...e.de>

commit 8f9e0ee38f75d4740daa9e42c8af628d33d19a02 upstream.

Commit 4044ba58dd15cb01797c4fd034f39ef4a75f7cc3 supposedly fixed a
problem where if a raid1 with just one good device gets a read-error
during recovery, the recovery would abort and immediately restart in
an infinite loop.

However it depended on raid1_remove_disk removing the spare device
from the array.  But that does not happen in this case.  So add a test
so that in the 'recovery_disabled' case, the device will be removed.

This suitable for any kernel since 2.6.29 which is when
recovery_disabled was introduced.

Reported-by: Sebastian Färber <faerber@...il.com>
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/md/raid1.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux/drivers/md/raid1.c
===================================================================
--- linux.orig/drivers/md/raid1.c
+++ linux/drivers/md/raid1.c
@@ -1208,6 +1208,7 @@ static int raid1_remove_disk(mddev_t *md
 		 * is not possible.
 		 */
 		if (!test_bit(Faulty, &rdev->flags) &&
+		    !mddev->recovery_disabled &&
 		    mddev->degraded < conf->raid_disks) {
 			err = -EBUSY;
 			goto abort;
--
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