Re: [libvirt] [PATCH 14/30] storagefile: Parse qcow2 external data file

This is tracked as a qcow2 extension, like backing store format Signed-off-by: Cole Robinson <crobinso(a)redhat.com&gt; ---

src/util/virstoragefile.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c index 621cc56e87..7e32d7619e 100644 --- a/src/util/virstoragefile.c +++ b/src/util/virstoragefile.c @@ -202,6 +202,7 @@ qedGetBackingStore(char **, int *, const char *, size_t); #define QCOW2_HDR_EXTENSION_END 0 #define QCOW2_HDR_EXTENSION_BACKING_FORMAT 0xE2792ACA +#define QCOW2_HDR_EXTENSION_DATA_FILE 0x44415441 #define QCOW2v3_HDR_FEATURES_INCOMPATIBLE (QCOW2_HDR_TOTAL_SIZE) #define QCOW2v3_HDR_FEATURES_COMPATIBLE (QCOW2v3_HDR_FEATURES_INCOMPATIBLE+8) @@ -429,7 +430,8 @@ cowGetBackingStore(char **res, static int qcow2GetExtensions(const char *buf, size_t buf_size, - int *backingFormat) + int *backingFormat, + char **externalDataStoreRaw) { size_t offset; size_t extension_start; @@ -508,6 +510,9 @@ qcow2GetExtensions(const char *buf, case QCOW2_HDR_EXTENSION_BACKING_FORMAT: { VIR_AUTOFREE(char *) tmp = NULL; + if (!backingFormat) + break; + if (VIR_ALLOC_N(tmp, len + 1) < 0) return -1; memcpy(tmp, buf + offset, len); @@ -516,6 +521,19 @@ qcow2GetExtensions(const char *buf, *backingFormat = virStorageFileFormatTypeFromString(tmp); if (*backingFormat <= VIR_STORAGE_FILE_NONE) return -1; + break; + } + + case QCOW2_HDR_EXTENSION_DATA_FILE: { + if (!externalDataStoreRaw) + break; + + if (VIR_ALLOC_N(*externalDataStoreRaw, len + 1) < 0) + return -1; + memcpy(*externalDataStoreRaw, buf + offset, len); + (*externalDataStoreRaw)[len] = '\0'; + VIR_DEBUG("parsed externalDataStoreRaw='%s'", *externalDataStoreRaw); + break; } } @@ -566,7 +584,7 @@ qcowXGetBackingStore(char **res, memcpy(*res, buf + offset, size); (*res)[size] = '\0'; - if (qcow2GetExtensions(buf, buf_size, format) < 0) + if (qcow2GetExtensions(buf, buf_size, format, NULL) < 0) return BACKING_STORE_INVALID; return BACKING_STORE_OK;