diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-06-22 10:12:26 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-06-22 10:12:26 +0100 |
| commit | 2bd023452592e5f5cf90dd426cc39b7632b15b76 (patch) | |
| tree | 62fe4d816c597e1b6c58bf150603dd72c9ce6135 /drivers/md/dm-snap-persistent.c | |
| parent | 51aa322849581f1a73594e48ea0df63f914ee6a2 (diff) | |
dm snapshot: use barrier when writing exception store
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>
Diffstat (limited to 'drivers/md/dm-snap-persistent.c')
| -rw-r--r-- | drivers/md/dm-snap-persistent.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index 2662a41337e7..6e3fe4f14934 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -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; /* |