[libvirt] [PATCH 13/14] util: storagefile: Don't traverse storage sources unusable by VM

virStorageFileGetMetadataRecurse would include in the backing chain files which would not really be usable by libvirt directly e.g. when such file would be promoted to the top layer by a active block commit as for example inline authentication data can't be represented in the VM xml file. The idea is to use secrets for this. With the changes to the backing store string parsers we can report and propagate if such a thing is present in the configuration and thus start skipping those files in the backing chain traversal code. This approach still allows to report the appropriate backing store string in the storage driver which doesn't directly use the backing file. Signed-off-by: Peter Krempa <pkrempa(a)redhat.com&gt; --- src/util/virstoragefile.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c index 32afee1ca7..efc1d84048 100644 --- a/src/util/virstoragefile.c +++ b/src/util/virstoragefile.c @@ -4941,9 +4941,15 @@ virStorageFileGetMetadataRecurse(virStorageSourcePtr src, goto cleanup; if (src->backingStoreRaw) { - if (virStorageSourceNewFromBacking(src, &backingStore) < 0) + if ((rv = virStorageSourceNewFromBacking(src, &backingStore)) < 0) goto cleanup; + if (rv == 1) { + /* the backing file would not be usable for VM usage */ + ret = 0; + goto cleanup; + } + if (backingFormat == VIR_STORAGE_FILE_AUTO) backingStore->format = VIR_STORAGE_FILE_RAW; else if (backingFormat == VIR_STORAGE_FILE_AUTO_SAFE) -- 2.21.0