qmp-input: Clean up stack handling

[qemu.git] / block.c

diff --git a/block.c b/block.c
index 7ff4fcb7f5cc8d65eef48eb37a6c039abd15e75e..d4939b49bf05b1778306c4b13f2b2dce70af4ca9 100644 (file)
--- a/block.c
+++ b/block.c
@@ -1526,6 +1526,13 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
         if (!bs) {
             return -ENODEV;
         }
+
+        if (bs->throttle_state) {
+            error_setg(errp, "Cannot reference an existing block device for "
+                       "which I/O throttling is enabled");
+            return -EINVAL;
+        }
+
         bdrv_ref(bs);
         *pbs = bs;
         return 0;
@@ -2695,22 +2702,6 @@ int bdrv_is_sg(BlockDriverState *bs)
     return bs->sg;
 }
 
-int bdrv_enable_write_cache(BlockDriverState *bs)
-{
-    if (bs->blk) {
-        return blk_enable_write_cache(bs->blk);
-    } else {
-        return true;
-    }
-}
-
-void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce)
-{
-    if (bs->blk) {
-        blk_set_enable_write_cache(bs->blk, wce);
-    }
-}
-
 int bdrv_is_encrypted(BlockDriverState *bs)
 {
     if (bs->backing && bs->backing->bs->encrypted) {