This is a note to let you know that I've just added the patch titled
md/raid1,raid10: always abort recover on write error.
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-raid1-raid10-always-abort-recover-on-write-error.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2446dba03f9dabe0b477a126cbeb377854785b47 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Thu, 31 Jul 2014 10:16:29 +1000
Subject: md/raid1,raid10: always abort recover on write error.
From: NeilBrown <neilb@xxxxxxx>
commit 2446dba03f9dabe0b477a126cbeb377854785b47 upstream.
Currently we don't abort recovery on a write error if the write error
to the recovering device was triggerd by normal IO (as opposed to
recovery IO).
This means that for one bitmap region, the recovery might write to the
recovering device for a few sectors, then not bother for subsequent
sectors (as it never writes to failed devices). In this case
the bitmap bit will be cleared, but it really shouldn't.
The result is that if the recovering device fails and is then re-added
(after fixing whatever hardware problem triggerred the failure),
the second recovery won't redo the region it was in the middle of,
so some of the device will not be recovered properly.
If we abort the recovery, the region being processes will be cancelled
(bit not cleared) and the whole region will be retried.
As the bug can result in data corruption the patch is suitable for
-stable. For kernels prior to 3.11 there is a conflict in raid10.c
which will require care.
Original-from: jiao hui <jiaohui@xxxxxxxxxxxxx>
Reported-and-tested-by: jiao hui <jiaohui@xxxxxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid1.c | 8 ++++----
drivers/md/raid10.c | 11 +++++------
2 files changed, 9 insertions(+), 10 deletions(-)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1501,12 +1501,12 @@ static void error(struct mddev *mddev, s
mddev->degraded++;
set_bit(Faulty, &rdev->flags);
spin_unlock_irqrestore(&conf->device_lock, flags);
- /*
- * if recovery is running, make sure it aborts.
- */
- set_bit(MD_RECOVERY_INTR, &mddev->recovery);
} else
set_bit(Faulty, &rdev->flags);
+ /*
+ * if recovery is running, make sure it aborts.
+ */
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
printk(KERN_ALERT
"md/raid1:%s: Disk failure on %s, disabling device.\n"
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1684,13 +1684,12 @@ static void error(struct mddev *mddev, s
spin_unlock_irqrestore(&conf->device_lock, flags);
return;
}
- if (test_and_clear_bit(In_sync, &rdev->flags)) {
+ if (test_and_clear_bit(In_sync, &rdev->flags))
mddev->degraded++;
- /*
- * if recovery is running, make sure it aborts.
- */
- set_bit(MD_RECOVERY_INTR, &mddev->recovery);
- }
+ /*
+ * If recovery is running, make sure it aborts.
+ */
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(Blocked, &rdev->flags);
set_bit(Faulty, &rdev->flags);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-3.16/md-raid10-fix-memory-leak-when-reshaping-a-raid10.patch
queue-3.16/md-raid6-avoid-data-corruption-during-recovery-of-double-degraded-raid6.patch
queue-3.16/md-raid1-raid10-always-abort-recover-on-write-error.patch
queue-3.16/md-raid10-fix-memory-leak-when-raid10-reshape-completes.patch
queue-3.16/md-raid5-avoid-livelock-caused-by-non-aligned-writes.patch
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