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-rw-r--r--block/block-backend.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/block/block-backend.c b/block/block-backend.c
index c2e873292a..225655126e 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -239,6 +239,23 @@ BlockDriverState *blk_bs(BlockBackend *blk)
}
/*
+ * Changes the BlockDriverState attached to @blk
+ */
+void blk_set_bs(BlockBackend *blk, BlockDriverState *bs)
+{
+ bdrv_ref(bs);
+
+ if (blk->bs) {
+ blk->bs->blk = NULL;
+ bdrv_unref(blk->bs);
+ }
+ assert(bs->blk == NULL);
+
+ blk->bs = bs;
+ bs->blk = blk;
+}
+
+/*
* Return @blk's DriveInfo if any, else null.
*/
DriveInfo *blk_legacy_dinfo(BlockBackend *blk)