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dm snapshot: use barrier when writing exception store

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Send barrier requests when updating the exception area.

Exception area updates need to be ordered w.r.t. data writes, so that
the writes are not reordered in hardware disk cache.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-06-22 10:12:26 +01:00 committed by Alasdair G Kergon
parent 51aa322849
commit 2bd0234525
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-snap-persistent.c
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@ -636,7 +636,7 @@ static void persistent_commit_exception(struct dm_exception_store *store,
/*
* Commit exceptions to disk.
*/
if (ps->valid && area_io(ps, WRITE))
if (ps->valid && area_io(ps, WRITE_BARRIER))
ps->valid = 0;
/*