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-rw-r--r--block.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/block.c b/block.c
index 994109e0b9..c7bc83773a 100644
--- a/block.c
+++ b/block.c
@@ -597,6 +597,26 @@ int bdrv_commit(BlockDriverState *bs)
return 0;
}
+/*
+ * Return values:
+ * 0 - success
+ * -EINVAL - backing format specified, but no file
+ * -ENOSPC - can't update the backing file because no space is left in the
+ * image file header
+ * -ENOTSUP - format driver doesn't support changing the backing file
+ */
+int bdrv_change_backing_file(BlockDriverState *bs,
+ const char *backing_file, const char *backing_fmt)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (drv->bdrv_change_backing_file != NULL) {
+ return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
+ } else {
+ return -ENOTSUP;
+ }
+}
+
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
size_t size)
{