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[libvirt] [PATCH] Refresh storage volume on dumpxml

The storage driver refreshes a volume's capacity+allocation data when
the 'info' command is called. Seems that we should also update it when
dumpxml is called, which also returns size information.

commit 26ec9d5cd9ae919ccdf3d122dcf3832f61f9476f
Author: Cole Robinson <crobinso redhat com>
Date:   Wed Apr 1 16:07:12 2009 -0400

    Refresh volume alloc/capacity when dumping XML.

diff --git a/src/storage_driver.c b/src/storage_driver.c
index b261843..97fcf69 100644
--- a/src/storage_driver.c
+++ b/src/storage_driver.c
@@ -1389,6 +1389,10 @@ storageVolumeGetXMLDesc(virStorageVolPtr obj,
     if ((backend = virStorageBackendForType(pool->def->type)) == NULL)
         goto cleanup;
+    if (backend->refreshVol &&
+        backend->refreshVol(obj->conn, pool, vol) < 0)
+        goto cleanup;
     ret = virStorageVolDefFormat(obj->conn, pool->def, vol);

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