dm: allow targets to request flushes regardless of underlying device support
Allow targets to override the 'supports flush' calculation.
Set 'flush_supported' if a target needs to receive flushes regardless of
whether or not its underlying devices have support.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 2e227fb..f900690 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1319,6 +1319,9 @@
if (!ti->num_flush_requests)
continue;
+ if (ti->flush_supported)
+ return 1;
+
if (ti->type->iterate_devices &&
ti->type->iterate_devices(ti, device_flush_capable, &flush))
return 1;