block/nbd: split connection_co start out of nbd_client_connect

nbd_client_connect is going to be used from connection_co, so, let's
refactor nbd_client_connect in advance, leaving io channel
configuration all in nbd_client_connect.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190618114328.55249-2-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

diff --git a/block/nbd.c b/block/nbd.c
index 57c1a20..c16d025 100644 (file)
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -1231,14 +1231,8 @@ static int nbd_client_connect(BlockDriverState *bs,
         object_ref(OBJECT(s->ioc));
     }
 
-    /*
-     * Now that we're connected, set the socket to be non-blocking and
-     * kick the reply mechanism.
-     */
     qio_channel_set_blocking(QIO_CHANNEL(sioc), false, NULL);
-    s->connection_co = qemu_coroutine_create(nbd_connection_entry, s);
-    bdrv_inc_in_flight(bs);
-    nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs));
+    qio_channel_attach_aio_context(s->ioc, bdrv_get_aio_context(bs));
 
     trace_nbd_client_connect_success(export);
 
@@ -1269,14 +1263,24 @@ static int nbd_client_init(BlockDriverState *bs,
                            const char *x_dirty_bitmap,
                            Error **errp)
 {
+    int ret;
     BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
 
     s->bs = bs;
     qemu_co_mutex_init(&s->send_mutex);
     qemu_co_queue_init(&s->free_sema);
 
-    return nbd_client_connect(bs, saddr, export, tlscreds, hostname,
-                              x_dirty_bitmap, errp);
+    ret = nbd_client_connect(bs, saddr, export, tlscreds, hostname,
+                             x_dirty_bitmap, errp);
+    if (ret < 0) {
+        return ret;
+    }
+
+    s->connection_co = qemu_coroutine_create(nbd_connection_entry, s);
+    bdrv_inc_in_flight(bs);
+    aio_co_schedule(bdrv_get_aio_context(bs), s->connection_co);
+
+    return 0;
 }
 
 static int nbd_parse_uri(const char *filename, QDict *options)