nbd: Always call "close_fn" in nbd_client_new

Rename the parameter "close" to "close_fn" to disambiguous with
close(2).

This unifies error handling paths of NBDClient allocation:
nbd_client_new will shutdown the socket and call the "close_fn" callback
if negotiation failed, so the caller don't need a different path than
the normal close.

The returned pointer is never used, make it void in preparation for the
next patch.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <1452760863-25350-2-git-send-email-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/nbd.c b/nbd.c
index b3d9654..f8d0221 100644
--- a/nbd.c
+++ b/nbd.c
@@ -1475,8 +1475,7 @@ static void nbd_update_can_read(NBDClient *client)
     }
 }
 
-NBDClient *nbd_client_new(NBDExport *exp, int csock,
-                          void (*close)(NBDClient *))
+void nbd_client_new(NBDExport *exp, int csock, void (*close_fn)(NBDClient *))
 {
     NBDClient *client;
     client = g_malloc0(sizeof(NBDClient));
@@ -1485,10 +1484,11 @@ NBDClient *nbd_client_new(NBDExport *exp, int csock,
     client->sock = csock;
     client->can_read = true;
     if (nbd_send_negotiate(client)) {
-        g_free(client);
-        return NULL;
+        shutdown(client->sock, 2);
+        close_fn(client);
+        return;
     }
-    client->close = close;
+    client->close = close_fn;
     qemu_co_mutex_init(&client->send_lock);
     nbd_set_handlers(client);
 
@@ -1496,5 +1496,4 @@ NBDClient *nbd_client_new(NBDExport *exp, int csock,
         QTAILQ_INSERT_TAIL(&exp->clients, client, next);
         nbd_export_get(exp);
     }
-    return client;
 }