[libvirt] [PATCHv4 09/29] util: storage: Add function to transfer config parts to new chain element
We are going to modify storage source chains in place. Add a helper that
will copy relevant information such as security labels to the new
element if that doesn't contain it.
---
src/libvirt_private.syms | 1 +
src/util/virstoragefile.c | 40 ++++++++++++++++++++++++++++++++++++++++
src/util/virstoragefile.h | 3 +++
3 files changed, 44 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 122e72a..7844e2f 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1910,6 +1910,7 @@ virStorageSourceCopy;
virStorageSourceFree;
virStorageSourceGetActualType;
virStorageSourceGetSecurityLabelDef;
+virStorageSourceInitChainElement;
virStorageSourceIsLocalStorage;
virStorageSourceNewFromBacking;
virStorageSourcePoolDefFree;
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index 330ba27..e27384d 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1711,6 +1711,46 @@ virStorageSourceCopy(const virStorageSource *src,
}
+/**
+ * virStorageSourceInitChainElement:
+ * @newelem: New backing chain element disk source
+ * @old: Existing top level disk source
+ * @force: Force-copy the information
+ *
+ * Transfers relevant information from the existing disk source to the new
+ * backing chain element if they weren't supplied so that labelling info
+ * and possibly other stuff is correct.
+ *
+ * If @force is true, user-supplied information for the new backing store
+ * element is overwritten from @old instead of keeping it.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int
+virStorageSourceInitChainElement(virStorageSourcePtr newelem,
+ virStorageSourcePtr old,
+ bool force)
+{
+ int ret = -1;
+
+ if (force) {
+ virStorageSourceSeclabelsClear(newelem);
+ }
+
+ if (!newelem->seclabels &&
+ virStorageSourceSeclabelsCopy(newelem, old) < 0)
+ goto cleanup;
+
+ newelem->shared = old->shared;
+ newelem->readonly = old->readonly;
+
+ ret = 0;
+
+ cleanup:
+ return ret;
+}
+
+
void
virStorageSourcePoolDefFree(virStorageSourcePoolDefPtr def)
{
diff --git a/src/util/virstoragefile.h b/src/util/virstoragefile.h
index f042847..78646ba 100644
--- a/src/util/virstoragefile.h
+++ b/src/util/virstoragefile.h
@@ -322,6 +322,9 @@ void virStorageNetHostDefFree(size_t nhosts, virStorageNetHostDefPtr
hosts);
virStorageNetHostDefPtr virStorageNetHostDefCopy(size_t nhosts,
virStorageNetHostDefPtr hosts);
+int virStorageSourceInitChainElement(virStorageSourcePtr newelem,
+ virStorageSourcePtr old,
+ bool force);
void virStorageSourceAuthClear(virStorageSourcePtr def);
void virStorageSourcePoolDefFree(virStorageSourcePoolDefPtr def);
void virStorageSourceClear(virStorageSourcePtr def);
--
1.9.3