qemu: domain: Add helper to generate indexed backing store names

The code is currently simple, but if we later add node names, it will be
necessary to generate the names based on the node name. Add a helper so
that there's a central point to fix once we add self-generated node
names.

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 34f4d014ba4d326fe33f55bbba13cb13d2924e5a..57b610c2215b8d7acba0ff46dfe223905aa053e1 100644 (file)
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8558,3 +8558,25 @@ qemuDomainDiskLookupByNodename(virDomainDefPtr def,
 
     return NULL;
 }
+
+
+/**
+ * qemuDomainDiskBackingStoreGetName:
+ *
+ * Creates a name using the indexed syntax (vda[1])for the given backing store
+ * entry for a disk.
+ */
+char *
+qemuDomainDiskBackingStoreGetName(virDomainDiskDefPtr disk,
+                                  virStorageSourcePtr src ATTRIBUTE_UNUSED,
+                                  unsigned int idx)
+{
+    char *ret = NULL;
+
+    if (idx)
+        ignore_value(virAsprintf(&ret, "%s[%d]", disk->dst, idx));
+    else
+        ignore_value(VIR_STRDUP(ret, disk->dst));
+
+    return ret;
+}

diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index efdf3934869a465fe9b2aba53914d4deeb9d27d9..74d76a88cd3b109863d1851858e3d792ecd4373f 100644 (file)
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -883,4 +883,8 @@ virDomainDiskDefPtr qemuDomainDiskLookupByNodename(virDomainDefPtr def,
                                                    virStorageSourcePtr *src,
                                                    unsigned int *idx);
 
+char *qemuDomainDiskBackingStoreGetName(virDomainDiskDefPtr disk,
+                                        virStorageSourcePtr src,
+                                        unsigned int idx);
+
 #endif /* __QEMU_DOMAIN_H__ */