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authorNeilBrown <neilb@suse.de>2009-01-09 08:31:11 +1100
committerNeilBrown <neilb@suse.de>2009-01-09 08:31:11 +1100
commit4044ba58dd15cb01797c4fd034f39ef4a75f7cc3 (patch)
treee1bea8143538fc3eaeeb8578c2f9231e32809a25 /drivers/md
parentefeb53c0e57213e843b7ef3cc6ebcdea7d6186ac (diff)
md: don't retry recovery of raid1 that fails due to error on source drive.
If a raid1 has only one working drive and it has a sector which gives an error on read, then an attempt to recover onto a spare will fail, but as the single remaining drive is not removed from the array, the recovery will be immediately re-attempted, resulting in an infinite recovery loop. So detect this situation and don't retry recovery once an error on the lone remaining drive is detected. Allow recovery to be retried once every time a spare is added in case the problem wasn't actually a media error. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c5
-rw-r--r--drivers/md/raid1.c8
2 files changed, 10 insertions, 3 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f5cbb9d2371..41e2509bf89 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1500,6 +1500,9 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
list_add_rcu(&rdev->same_set, &mddev->disks);
bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
+
+ /* May as well allow recovery to be retried once */
+ mddev->recovery_disabled = 0;
return 0;
fail:
@@ -6175,7 +6178,7 @@ static int remove_and_add_spares(mddev_t *mddev)
}
}
- if (mddev->degraded && ! mddev->ro) {
+ if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
list_for_each_entry(rdev, &mddev->disks, same_set) {
if (rdev->raid_disk >= 0 &&
!test_bit(In_sync, &rdev->flags) &&
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index c165b1eed8b..7b4f5f7155d 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1016,12 +1016,16 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
* else mark the drive as failed
*/
if (test_bit(In_sync, &rdev->flags)
- && (conf->raid_disks - mddev->degraded) == 1)
+ && (conf->raid_disks - mddev->degraded) == 1) {
/*
* Don't fail the drive, act as though we were just a
- * normal single drive
+ * normal single drive.
+ * However don't try a recovery from this drive as
+ * it is very likely to fail.
*/
+ mddev->recovery_disabled = 1;
return;
+ }
if (test_and_clear_bit(In_sync, &rdev->flags)) {
unsigned long flags;
spin_lock_irqsave(&conf->device_lock, flags);