diff --git a/drivers/XE_SR_ERRORCODES.xml b/drivers/XE_SR_ERRORCODES.xml
index ca4e3bc2..bfd97727 100755
--- a/drivers/XE_SR_ERRORCODES.xml
+++ b/drivers/XE_SR_ERRORCODES.xml
@@ -94,16 +94,16 @@
                 <description>Invalid local path</description>
                 <value>226</value>
         </code>
-        <code>
-                <name>ISOInvalidSMBversion</name>
-                <description>Given SMB version is not allowed. Choose either 1.0 or 3.0</description>
-                <value>227</value>
-        </code>
-        <code>
-                <name>ISOInvalidXeMountOptions</name>
-                <description>Require "-o" along with xe-mount-isosr</description>
-                <value>228</value>
-        </code>
+        <code>
+                <name>ISOInvalidSMBversion</name>
+                <description>Given SMB version is not allowed. Choose either 1.0 or 3.0</description>
+                <value>227</value>
+        </code>
+        <code>
+                <name>ISOInvalidXeMountOptions</name>
+                <description>Require "-o" along with xe-mount-isosr</description>
+                <value>228</value>
+        </code>
 
         <!-- generic invalid arguments -->
         <code>
@@ -752,6 +752,11 @@
                 <description>An active FIST point was reached that causes the process to exit abnormally</description>
                 <value>203</value>
         </code>
+        <code>
+                <name>LeafGCSkip</name>
+                <description>Gave up on leaf coalesce after leaf grew bigger than startbefore snapshot taken</description>
+                <value>204</value>
+        </code>
 
         <code>
                 <name>XMLParse</name>
@@ -859,12 +864,12 @@
             <description>Failed to calculate changed blocks for given VDIs.</description>
             <value>460</value>
         </code>
-
+
         <code>
             <name>GenericException</name>
             <description>SM has thrown a generic python exception</description>
             <value>1200</value>
         </code>
 
-
+
 </SM-errorcodes>
diff --git a/drivers/cleanup.py b/drivers/cleanup.py
index c6787d99..b89154de 100755
--- a/drivers/cleanup.py
+++ b/drivers/cleanup.py
@@ -41,6 +41,7 @@
 import fjournaler
 import lock
 import blktap2
+import xs_errors
 from refcounter import RefCounter
 from ipc import IPCFlag
 from lvmanager import LVActivator
@@ -1587,14 +1588,13 @@ def coalesceLeaf(self, vdi, dryRun):
                 vdi = self.getVDI(uuid)
                 if vdi:
                     vdi.delConfig(vdi.DB_LEAFCLSC)
+        except AbortException:
+            self.cleanup()
+            raise
         except (util.SMException, XenAPI.Failure), e:
-            if isinstance(e, AbortException):
-                self.cleanup()
-                raise
-            else:
-                self._failedCoalesceTargets.append(vdi)
-                Util.logException("leaf-coalesce")
-                Util.log("Leaf-coalesce failed, skipping")
+            self._failedCoalesceTargets.append(vdi)
+            Util.logException("leaf-coalesce")
+            Util.log("Leaf-coalesce failed on %s, skipping" % vdi)
         self.cleanup()
 
     def garbageCollect(self, dryRun = False):
@@ -1786,7 +1786,7 @@ def _coalesceLeaf(self, vdi):
                          "current %s. Abandoning attempts" %
                          (prevSizeVHD, vdi.getSizeVHD()))
                 vdi.setConfig(vdi.DB_LEAFCLSC, vdi.LEAFCLSC_OFFLINE)
-                return False
+                raise xs_errors.XenError('LeafGCSkip', opterr='VDI=%s' % vdi)
         return self._liveLeafCoalesce(vdi)
 
     def _snapshotCoalesce(self, vdi):