Re: [PATCH v2 04/14] aio: make aio_context_acquire()/aio_context_release() a no-op

[Stefan Hajnoczi]

The following hack makes the test pass but there are larger safety
issues that I'll need to look at on Wednesday:

diff --git a/nbd/server.c b/nbd/server.c
index 895cf0a752..cf4b7d5c6d 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1617,7 +1617,7 @@ static void nbd_drained_begin(void *opaque)
     }
 }

-static void nbd_drained_end(void *opaque)
+static void nbd_resume_clients(void *opaque)
 {
     NBDExport *exp = opaque;
     NBDClient *client;
@@ -1628,6 +1628,15 @@ static void nbd_drained_end(void *opaque)
     }
 }

+static void nbd_drained_end(void *opaque)
+{
+    NBDExport *exp = opaque;
+
+    /* TODO how to make sure exp doesn't go away? */
+    /* TODO what if AioContext changes before this runs? */
+    aio_bh_schedule_oneshot(nbd_export_aio_context(exp),
nbd_resume_clients, exp);
+}
+
 static bool nbd_drained_poll(void *opaque)
 {
     NBDExport *exp = opaque;