master - libdm: enable no_flush for driver version > 11

[Zdenek Kabelac]

Gitweb:        http://git.fedorahosted.org/git/?p=lvm2.git;a=commitdiff;h=9139d7a4bbaf0b694...
Commit:        9139d7a4bbaf0b6944802b7c6f893e23b59633f7
Parent:        f898cf7539149a54a121b0aae59076c2d647bb37
Author:        Zdenek Kabelac 
AuthorDate:    Sun Oct 25 23:43:47 2015 +0100
Committer:     Zdenek Kabelac 
CommitterDate: Sun Oct 25 23:43:47 2015 +0100

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.
---
 libdm/ioctl/libdm-iface.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/libdm/ioctl/libdm-iface.c b/libdm/ioctl/libdm-iface.c
index 58a8dfe..615bbd5 100644
--- 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 < 11)
+			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)