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dm snapshot: flush disk cache when merging

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commit 762a80d9fc 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 <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mikulas Patocka 2011-08-02 12:32:00 +01:00 committed by Greg Kroah-Hartman
parent ee607aa21a
commit b41ed9c38a
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-snap-persistent.c
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@ -753,7 +753,7 @@ static int persistent_commit_merge(struct dm_exception_store *store,
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;