libdm: enable no_flush for driver version > 11

It appears the driver version 11 has troubles with usage of no_flush
So require at least version 12.

diff --git a/libdm/ioctl/libdm-iface.c b/libdm/ioctl/libdm-iface.c
index 58a8dfe51123e25c5627020a083803391d4efc42..2a36b77b105f0ce366319d35201fed0ae85de890 100644 (file)
--- a/libdm/ioctl/libdm-iface.c
+++ b/libdm/ioctl/libdm-iface.c
@@ -1202,8 +1202,13 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
 
        if (dmt->type == DM_DEVICE_SUSPEND)
                dmi->flags |= DM_SUSPEND_FLAG;
-       if (dmt->no_flush)
-               dmi->flags |= DM_NOFLUSH_FLAG;
+       if (dmt->no_flush) {
+               if (_dm_version_minor < 12)
+                       log_verbose("No flush flag unsupported by kernel. "
+                                   "Buffers will be flushed.");
+               else
+                       dmi->flags |= DM_NOFLUSH_FLAG;
+       }
        if (dmt->read_only)
                dmi->flags |= DM_READONLY_FLAG;
        if (dmt->skip_lockfs)