Add dedicated volume scan endpoint

Allows an imported volume to be scanned for stats independently.

Designed to be used as part of a snapshot import via API, to allow the
"create" to happen before the real import (to check for available space,
etc.) and then run this import after when the RBD volume actually
exists.

api-daemon/pvcapid/helper.py

@@ -1996,6 +1996,22 @@ def ceph_volume_list(zkhandler, pool=None, limit=None, is_fuzzy=True):
     return retdata, retcode
 
 
+@ZKConnection(config)
+def ceph_volume_scan(zkhandler, pool, name):
+    """
+    (Re)scan a Ceph RBD volume for stats in the PVC Ceph storage cluster.
+    """
+    retflag, retdata = pvc_ceph.scan_volume(zkhandler, pool, name)
+
+    if retflag:
+        retcode = 200
+    else:
+        retcode = 400
+
+    output = {"message": retdata.replace('"', "'")}
+    return output, retcode
+
+
 @ZKConnection(config)
 def ceph_volume_add(zkhandler, pool, name, size, force_flag=False):
     """