block-coroutine-wrapper: allow non bdrv_ prefix

We are going to reuse the script to generate a nbd_ function in
further commit. Prepare the script now.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210610100802.5888-28-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

scripts/block-coroutine-wrapper.py

@@ -98,12 +98,13 @@ def snake_to_camel(func_name: str) -> str:
 
 
 def gen_wrapper(func: FuncDecl) -> str:
-    assert func.name.startswith('bdrv_')
-    assert not func.name.startswith('bdrv_co_')
+    assert not '_co_' in func.name
     assert func.return_type == 'int'
     assert func.args[0].type in ['BlockDriverState *', 'BdrvChild *']
 
-    name = 'bdrv_co_' + func.name[5:]
+    subsystem, subname = func.name.split('_', 1)
+
+    name = f'{subsystem}_co_{subname}'
     bs = 'bs' if func.args[0].type == 'BlockDriverState *' else 'child->bs'
     struct_name = snake_to_camel(name)