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/flaskapi.py

@@ -6461,6 +6461,41 @@ api.add_resource(
 )
 
 
+# /storage/ceph/volume/<pool>/<volume>/scan
+class API_Storage_Ceph_Volume_Element_Scan(Resource):
+    @Authenticator
+    def post(self, pool, volume):
+        """
+        Scan a Ceph volume {volume} in pool {pool} for stats (after import)
+        ---
+        tags:
+          - storage / ceph
+        parameters:
+        responses:
+          200:
+            description: OK
+            schema:
+              type: object
+              id: Message
+          404:
+            description: Not found
+            schema:
+              type: object
+              id: Message
+          400:
+            description: Bad request
+            schema:
+              type: object
+              id: Message
+        """
+        return api_helper.ceph_volume_scan(pool, volume)
+
+
+api.add_resource(
+    API_Storage_Ceph_Volume_Element_Scan, "/storage/ceph/volume/<pool>/<volume>/scan"
+)
+
+
 # /storage/ceph/volume/<pool>/<volume>/clone
 class API_Storage_Ceph_Volume_Element_Clone(Resource):
     @RequestParser(

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):
     """

daemon-common/ceph.py

@@ -560,7 +560,21 @@ def getVolumeInformation(zkhandler, pool, volume):
     return volume_information
 
 
-def add_volume(zkhandler, pool, name, size, force_flag=False):
+def scan_volume(zkhandler, pool, name):
+    retcode, stdout, stderr = common.run_os_command(
+        "rbd info --format json {}/{}".format(pool, name)
+    )
+    volstats = stdout
+
+    # 3. Add the new volume to Zookeeper
+    zkhandler.write(
+        [
+            (("volume.stats", f"{pool}/{name}"), volstats),
+        ]
+    )
+
+
+def add_volume(zkhandler, pool, name, size, force_flag=False, zk_only=False):
     # 1. Verify the size of the volume
     pool_information = getPoolInformation(zkhandler, pool)
     size_bytes = format_bytes_fromhuman(size)
@@ -592,27 +606,28 @@ def add_volume(zkhandler, pool, name, size, force_flag=False):
         )
 
     # 2. Create the volume
+    # zk_only flag skips actually creating the volume - this would be done by some other mechanism
+    if not zk_only:
         retcode, stdout, stderr = common.run_os_command(
             "rbd create --size {}B {}/{}".format(size_bytes, pool, name)
         )
         if retcode:
-        return False, 'ERROR: Failed to create RBD volume "{}": {}'.format(name, stderr)
+            return False, 'ERROR: Failed to create RBD volume "{}": {}'.format(
-
+                name, stderr
-    # 2. Get volume stats
-    retcode, stdout, stderr = common.run_os_command(
-        "rbd info --format json {}/{}".format(pool, name)
             )
-    volstats = stdout
 
     # 3. Add the new volume to Zookeeper
     zkhandler.write(
         [
             (("volume", f"{pool}/{name}"), ""),
-            (("volume.stats", f"{pool}/{name}"), volstats),
+            (("volume.stats", f"{pool}/{name}"), ""),
             (("snapshot", f"{pool}/{name}"), ""),
         ]
     )
 
+    # 4. Scan the volume stats
+    scan_volume(zkhandler, pool, name)
+
     return True, 'Created RBD volume "{}" of size "{}" in pool "{}".'.format(
         name, format_bytes_tohuman(size_bytes), pool
     )
@@ -662,21 +677,18 @@ def clone_volume(zkhandler, pool, name_src, name_new, force_flag=False):
             ),
         )
 
-    # 3. Get volume stats
+    # 3. Add the new volume to Zookeeper
-    retcode, stdout, stderr = common.run_os_command(
-        "rbd info --format json {}/{}".format(pool, name_new)
-    )
-    volstats = stdout
-
-    # 4. Add the new volume to Zookeeper
     zkhandler.write(
         [
             (("volume", f"{pool}/{name_new}"), ""),
-            (("volume.stats", f"{pool}/{name_new}"), volstats),
+            (("volume.stats", f"{pool}/{name_new}"), ""),
             (("snapshot", f"{pool}/{name_new}"), ""),
         ]
     )
 
+    # 4. Scan the volume stats
+    scan_volume(zkhandler, pool, name_new)
+
     return True, 'Cloned RBD volume "{}" to "{}" in pool "{}"'.format(
         name_src, name_new, pool
     )
@@ -761,20 +773,8 @@ def resize_volume(zkhandler, pool, name, size, force_flag=False):
         except Exception:
             pass
 
-    # 4. Get volume stats
+    # 4. Scan the volume stats
-    retcode, stdout, stderr = common.run_os_command(
+    scan_volume(zkhandler, pool, name)
-        "rbd info --format json {}/{}".format(pool, name)
-    )
-    volstats = stdout
-
-    # 5. Update the volume in Zookeeper
-    zkhandler.write(
-        [
-            (("volume", f"{pool}/{name}"), ""),
-            (("volume.stats", f"{pool}/{name}"), volstats),
-            (("snapshot", f"{pool}/{name}"), ""),
-        ]
-    )
 
     return True, 'Resized RBD volume "{}" to size "{}" in pool "{}".'.format(
         name, format_bytes_tohuman(size_bytes), pool
@@ -807,18 +807,8 @@ def rename_volume(zkhandler, pool, name, new_name):
         ]
     )
 
-    # 3. Get volume stats
+    # 3. Scan the volume stats
-    retcode, stdout, stderr = common.run_os_command(
+    scan_volume(zkhandler, pool, new_name)
-        "rbd info --format json {}/{}".format(pool, new_name)
-    )
-    volstats = stdout
-
-    # 4. Update the volume stats in Zookeeper
-    zkhandler.write(
-        [
-            (("volume.stats", f"{pool}/{new_name}"), volstats),
-        ]
-    )
 
     return True, 'Renamed RBD volume "{}" to "{}" in pool "{}".'.format(
         name, new_name, pool