This is a note to let you know that I've just added the patch titled
dm snapshot: flush disk cache when merging
to the 3.0-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:
dm-snapshot-flush-disk-cache-when-merging.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@kernel.org> know about it.
>From 762a80d9fc9f690a3a35983f3b4619a220650808 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpato...@redhat.com>
Date: Tue, 2 Aug 2011 12:32:00 +0100
Subject: dm snapshot: flush disk cache when merging
From: Mikulas Patocka <mpato...@redhat.com>
commit 762a80d9fc9f690a3a35983f3b4619a220650808 upstream.
This patch makes dm-snapshot flush disk cache when writing metadata for
merging snapshot.
Without cache flushing the disk may reorder metadata write and other
data writes and there is a possibility of data corruption in case of
power fault.
Signed-off-by: Mikulas Patocka <mpato...@redhat.com>
Signed-off-by: Alasdair G Kergon <a...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
drivers/md/dm-snap-persistent.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -753,7 +753,7 @@ static int persistent_commit_merge(struc
for (i = 0; i < nr_merged; i++)
clear_exception(ps, ps->current_committed - 1 - i);
- r = area_io(ps, WRITE);
+ r = area_io(ps, WRITE_FLUSH_FUA);
if (r < 0)
return r;
Patches currently in stable-queue which might be from mpato...@redhat.com are
queue-3.0/dm-snapshot-flush-disk-cache-when-merging.patch
queue-3.0/dm-io-flush-cpu-cache-with-vmapped-io.patch
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