linux-kernel - [34-longterm 050/209] md/raid1: really fix recovery looping when single good device fails.

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Date:	Thu, 14 Apr 2011 13:41:20 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, NeilBrown <neilb@...e.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 050/209] md/raid1: really fix recovery looping when single good device fails.

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

  =====================================================================
  | This is a commit scheduled for the next v2.6.34 longterm release. |
  | If you see a problem with using this for longterm, please comment.|
  =====================================================================

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: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/md/raid1.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 52c6b5f..aaa49f1 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1214,6 +1214,7 @@ static int raid1_remove_disk(mddev_t *mddev, int number)
 		 * is not possible.
 		 */
 		if (!test_bit(Faulty, &rdev->flags) &&
+		    !mddev->recovery_disabled &&
 		    mddev->degraded < conf->raid_disks) {
 			err = -EBUSY;
 			goto abort;
-- 
1.7.4.4

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