Add support for resizine a CephFS share

This also protects against resizing the share to smaller than
the in-use value of the share.

actions.yaml

@@ -34,6 +34,18 @@ grant-access:
       description: IP address or network to change access for
       type: string
       default:
+resize-share:
+  description: |
+    Resize a specified share.
+  params:
+    name:
+      description: Name of the share
+      type: string
+      default:
+    size:
+      description: What size (GB) should the share be
+      type: integer
+      default:
 
 revoke-access:
   description: |

src/charm.py

@@ -200,6 +200,9 @@ class CephNfsCharm(
         self.framework.observe(
             self.on.list_shares_action,
             self.list_shares_action)
+        self.framework.observe(
+            self.on.resize_share_action,
+            self.resize_share_action)
         self.framework.observe(
             self.on.delete_share_action,
             self.delete_share_action
@@ -470,7 +473,18 @@ class CephNfsCharm(
             return
         self.peers.trigger_reload()
         event.set_results({
-            "message": "Acess revoked",
+            "message": "Access revoked",
+        })
+
+    def resize_share_action(self, event):
+        name = event.params.get('name')
+        size = event.params.get('size')
+        if size is None:
+            event.fail("Size must be set")
+        client = GaneshaNfs(self.client_name, self.pool_name)
+        client.resize_share(name=name, size=size)
+        event.set_results({
+            "message": f"{name} is now {size}GB",
         })
 
 

src/ganesha.py

@@ -177,6 +177,10 @@ class GaneshaNfs(object):
                 logging.warning("Encountered an independently created export")
         return exports
 
+    def resize_share(self, name: str, size: int):
+        size_in_bytes = size * 1024 * 1024
+        self._ceph_subvolume_command('resize', 'ceph-fs', name, str(size_in_bytes), '--no_shrink')
+
     def delete_share(self, name: str, purge=False):
         share = [share for share in self.list_shares() if share.name == name]
         if share: