[libvirt PATCH v2 12/31] storage_source: introduce virStorageSourceChainLookupBySource
Looks up disk storage source within storage source chain using storage
source object instead of path to make it work with all disk types.
Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com>
---
src/libvirt_private.syms | 1 +
src/storage_file/storage_source.c | 39 +++++++++++++++++++++++++++++++
src/storage_file/storage_source.h | 6 +++++
3 files changed, 46 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ae746a2d51..6ec405ef67 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1778,6 +1778,7 @@ virStorageFileProbeGetMetadata;
# storage_file/storage_source.h
virStorageSourceAccess;
virStorageSourceChainLookup;
+virStorageSourceChainLookupBySource;
virStorageSourceChown;
virStorageSourceCreate;
virStorageSourceDeinit;
diff --git a/src/storage_file/storage_source.c b/src/storage_file/storage_source.c
index ab0cdf2b12..a15d766bec 100644
--- a/src/storage_file/storage_source.c
+++ b/src/storage_file/storage_source.c
@@ -322,6 +322,45 @@ virStorageSourceChainLookup(virStorageSource *chain,
}
+/**
+ * virStorageSourceChainLookupBySource:
+ * @chain: chain top to look in
+ * @base: stourage source to look for in @chain
+ * @parent: Filled with parent virStorageSource of the returned value if non-NULL.
+ *
+ * Looks up a storage source definition corresponding to @base in @chain.
+ *
+ * Returns virStorageSource withing chain or NULL if not found.
+ */
+virStorageSource *
+virStorageSourceChainLookupBySource(virStorageSource *chain,
+ virStorageSource *base,
+ virStorageSource **parent)
+{
+ virStorageSource *prev = NULL;
+
+ if (parent)
+ *parent = NULL;
+
+ while (virStorageSourceIsBacking(chain)) {
+ if (virStorageSourceIsSameLocation(chain, base))
+ break;
+
+ prev = chain;
+ chain = chain->backingStore;
+ }
+
+ if (!virStorageSourceIsBacking(chain)) {
+ virReportError(VIR_ERR_INVALID_ARG, "%s",
+ _("could not find base disk source in disk source
chain"));
+ return NULL;
+ }
+
+ *parent = prev;
+ return chain;
+}
+
+
static virStorageSource *
virStorageSourceNewFromBackingRelative(virStorageSource *parent,
const char *rel)
diff --git a/src/storage_file/storage_source.h b/src/storage_file/storage_source.h
index 0ae06f4e7d..63fefb6919 100644
--- a/src/storage_file/storage_source.h
+++ b/src/storage_file/storage_source.h
@@ -47,6 +47,12 @@ virStorageSourceChainLookup(virStorageSource *chain,
virStorageSource **parent)
ATTRIBUTE_NONNULL(1);
+virStorageSource *
+virStorageSourceChainLookupBySource(virStorageSource *chain,
+ virStorageSource *base,
+ virStorageSource **parent)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+
int
virStorageSourceUpdatePhysicalSize(virStorageSource *src,
int fd,
--
2.39.0