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util: storage: Allow specifying format for virStorageFileGetMetadataFromBuf

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To allow reusing this function in the qemu driver we need to allow
specifying the storage format. Also separate return of the backing store
path now isn't necessary.
This commit is contained in:
Peter Krempa 2014-07-07 11:38:28 +02:00
parent d3047061d0
commit 25924dec0f
3 changed files with 23 additions and 24 deletions
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5
src/storage/storage_backend_gluster.c
View File

@ -294,10 +294,13 @@ virStorageBackendGlusterRefreshVol(virStorageBackendGlusterStatePtr state,
goto cleanup;
if (!(meta = virStorageFileGetMetadataFromBuf(name, header, len,
&vol->backingStore.path,
VIR_STORAGE_FILE_AUTO,
&vol->backingStore.format)))
goto cleanup;
vol->backingStore.path = meta->backingStoreRaw;
meta->backingStoreRaw = NULL;
vol->target.format = meta->format;
if (vol->backingStore.path &&
vol->backingStore.format < 0)

40
src/util/virstoragefile.c
View File

@ -930,19 +930,20 @@ virStorageFileMetadataNew(const char *path,
* @path: name of file, for error messages
* @buf: header bytes from @path
* @len: length of @buf
* @backing: output malloc'd name of backing image, if any
* @format: format of the storage file
* @backingFormat: format of @backing
*
* Extract metadata about the storage volume, including probing its
* format. Does not recurse. Callers are advised not to trust the
* learned format if a guest has ever used the volume when it was
* raw, since a malicious guest can turn a raw file into any
* other non-raw format at will.
* Extract metadata about the storage volume with the specified image format.
* If image format is VIR_STORAGE_FILE_AUTO, it will probe to automatically
* identify the format. Does not recurse.
*
* If the returned @backingFormat is VIR_STORAGE_FILE_AUTO
* it indicates the image didn't specify an explicit format for its
* backing store. Callers are advised against probing for the
* backing store format in this case.
* Callers are advised never to use VIR_STORAGE_FILE_AUTO as a format on a file
* that might be raw if that file will then be passed to a guest, since a
* malicious guest can turn a raw file into any other non-raw format at will.
*
* If the returned @backingFormat is VIR_STORAGE_FILE_AUTO it indicates the
* image didn't specify an explicit format for its backing store. Callers are
* advised against probing for the backing store format in this case.
*
* Caller MUST free the result after use via virStorageSourceFree.
*/
@ -950,25 +951,20 @@ virStorageSourcePtr
virStorageFileGetMetadataFromBuf(const char *path,
char *buf,
size_t len,
char **backing,
int format,
int *backingFormat)
{
virStorageSourcePtr ret = NULL;
virStorageSourcePtr meta = NULL;
if (!(meta = virStorageFileMetadataNew(path, VIR_STORAGE_FILE_AUTO)))
if (!(ret = virStorageFileMetadataNew(path, format)))
return NULL;
if (virStorageFileGetMetadataInternal(meta, buf, len,
backingFormat) < 0)
goto cleanup;
if (VIR_STRDUP(*backing, meta->backingStoreRaw) < 0)
goto cleanup;
if (virStorageFileGetMetadataInternal(ret, buf, len,
backingFormat) < 0) {
virStorageSourceFree(ret);
return NULL;
}
ret = meta;
meta = NULL;
cleanup:
virStorageSourceFree(meta);
return ret;
}

2
src/util/virstoragefile.h
View File

@ -290,7 +290,7 @@ virStorageSourcePtr virStorageFileGetMetadataFromFD(const char *path,
virStorageSourcePtr virStorageFileGetMetadataFromBuf(const char *path,
char *buf,
size_t len,
char **backing,
int format,
int *backingFormat)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(4)
ATTRIBUTE_NONNULL(5);