qa: add krbd_get_features.t test

Run it together with krbd_blkroset.t.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

qa/rbd/krbd_get_features.t

@@ -0,0 +1,31 @@
+
+journaling makes the image only unreadable, rather than both unreadable
+and unwritable:
+
+  $ rbd create --size 1 --image-feature layering,exclusive-lock,journaling img
+  $ rbd snap create img@snap
+  $ rbd snap protect img@snap
+  $ rbd clone --image-feature layering,exclusive-lock,journaling img@snap cloneimg
+
+  $ DEV=$(sudo rbd map img)
+  rbd: sysfs write failed
+  rbd: map failed: (6) No such device or address
+  [6]
+  $ DEV=$(sudo rbd map --read-only img)
+  $ blockdev --getro $DEV
+  1
+  $ sudo rbd unmap $DEV
+
+  $ DEV=$(sudo rbd map cloneimg)
+  rbd: sysfs write failed
+  rbd: map failed: (6) No such device or address
+  [6]
+  $ DEV=$(sudo rbd map --read-only cloneimg)
+  $ blockdev --getro $DEV
+  1
+  $ sudo rbd unmap $DEV
+
+  $ rbd rm --no-progress cloneimg
+  $ rbd snap unprotect img@snap
+  $ rbd snap rm --no-progress img@snap
+  $ rbd rm --no-progress img

qa/suites/krbd/basic/tasks/krbd_blkroset.yaml → qa/suites/krbd/basic/tasks/krbd_read_only.yaml

@@ -3,3 +3,4 @@ tasks:
     clients:
       client.0:
       - qa/rbd/krbd_blkroset.t
+      - qa/rbd/krbd_get_features.t