Similarly to other bits of code, we don't need to setup the format layer
if it will not be formatted. Add logic which uses
qemuBlockStorageSourceNeedsFormatLayer to see whether the setup of the
format node is needed.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
---
 src/qemu/qemu_domain.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index ae19ce884b..6d3161c5d7 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -11145,11 +11145,21 @@ qemuDomainPrepareStorageSourceBlockdevNodename(virDomainDiskDef *disk,
                                                virQEMUDriverConfig *cfg)
 {
     char *nodestorage = g_strdup_printf("%s-storage", nodenameprefix);
-    char *nodeformat = g_strdup_printf("%s-format", nodenameprefix);
+    const char *encryptionAlias = nodestorage;

     /* qemuBlockStorageSourceSetStorageNodename steals 'nodestorage' */
     qemuBlockStorageSourceSetStorageNodename(src, nodestorage);
-    qemuBlockStorageSourceSetFormatNodename(src, nodeformat);
+
+    if (qemuBlockStorageSourceNeedsFormatLayer(src)) {
+        char *nodeformat = g_strdup_printf("%s-format", nodenameprefix);
+
+        qemuBlockStorageSourceSetFormatNodename(src, nodeformat);
+
+        encryptionAlias = nodeformat;
+    }
+
+    if (qemuDomainSecretStorageSourcePrepareEncryption(priv, src, encryptionAlias) < 0)
+        return -1;

     if (qemuBlockStorageSourceNeedsStorageSliceLayer(src))
         src->sliceStorage->nodename = g_strdup_printf("libvirt-%u-slice-sto", src->id);
@@ -11163,9 +11173,6 @@ qemuDomainPrepareStorageSourceBlockdevNodename(virDomainDiskDef *disk,
     qemuDomainPrepareStorageSourceConfig(src, cfg);
     qemuDomainPrepareDiskSourceData(disk, src);

-    if (qemuDomainSecretStorageSourcePrepareEncryption(priv, src, nodeformat) < 0)
-        return -1;
-
     if (!qemuDomainPrepareStorageSourceNbdkit(src, cfg, nodestorage, priv)) {
         /* If we're using nbdkit to serve the storage source, we don't pass
          * authentication secrets to qemu, but will pass them to nbdkit instead */
-- 
2.42.0
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