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-rw-r--r--include/block/block_int.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 53e77cf11e..8f8e65e763 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -54,6 +54,7 @@
#define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts"
#define BLOCK_OPT_ADAPTER_TYPE "adapter_type"
#define BLOCK_OPT_REDUNDANCY "redundancy"
+#define BLOCK_OPT_NOCOW "nocow"
typedef struct BdrvTrackedRequest {
BlockDriverState *bs;
@@ -462,13 +463,14 @@ void stream_start(BlockDriverState *bs, BlockDriverState *base,
* @on_error: The action to take upon error.
* @cb: Completion function for the job.
* @opaque: Opaque pointer value passed to @cb.
+ * @backing_file_str: String to use as the backing file in @top's overlay
* @errp: Error object.
*
*/
void commit_start(BlockDriverState *bs, BlockDriverState *base,
BlockDriverState *top, int64_t speed,
BlockdevOnError on_error, BlockDriverCompletionFunc *cb,
- void *opaque, Error **errp);
+ void *opaque, const char *backing_file_str, Error **errp);
/**
* commit_active_start:
* @bs: Active block device to be committed.