[libvirt] [RFC PATCH 05/12] qemu: domain: Add helper to lookup disk by node name
Looks up a disk and it's corresponding backing chain element by node
name.
---
src/qemu/qemu_domain.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_domain.h | 6 ++++++
2 files changed, 50 insertions(+)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index c187214dc..4b446f1e8 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8275,3 +8275,47 @@ qemuDomainNamespaceTeardownRNG(virQEMUDriverPtr driver,
cleanup:
return ret;
}
+
+
+/**
+ * qemuDomainDiskLookupByNodename:
+ * @def: domain definition to look for the disk
+ * @nodename: block backend node name to find
+ * @src: filled with the specific backing store element if provided
+ * @idx: index of @src in the backing chain, if provided
+ *
+ * Looks up the disk in the domain via @nodename and returns it's definition.
+ * Optionally fills @src and @idx if provided with the specific backing chain
+ * element which corresponds to the node name.
+ */
+virDomainDiskDefPtr
+qemuDomainDiskLookupByNodename(virDomainDefPtr def,
+ const char *nodename,
+ virStorageSourcePtr *src,
+ unsigned int *idx)
+{
+ size_t i;
+ unsigned int srcindex;
+ virStorageSourcePtr tmp = NULL;
+
+ if (src)
+ *src = NULL;
+
+ if (idx)
+ *idx = 0;
+
+ for (i = 0; i < def->ndisks; i++) {
+ if ((tmp = virStorageSourceFindByNodeName(def->disks[i]->src,
+ nodename, &srcindex))) {
+ if (src)
+ *src = tmp;
+
+ if (idx)
+ *idx = srcindex;
+
+ return def->disks[i];
+ }
+ }
+
+ return NULL;
+}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 72efa3336..03377645f 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -849,4 +849,10 @@ int qemuDomainNamespaceSetupRNG(virQEMUDriverPtr driver,
int qemuDomainNamespaceTeardownRNG(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainRNGDefPtr rng);
+
+virDomainDiskDefPtr qemuDomainDiskLookupByNodename(virDomainDefPtr def,
+ const char *nodename,
+ virStorageSourcePtr *src,
+ unsigned int *idx);
+
#endif /* __QEMU_DOMAIN_H__ */
--
2.11.1