NFSv4.1: Don't update sequence number if rpc_task is not sent

If we fail to contact the gss upcall program, then no message will
be sent to the server.  The client still updated the sequence number,
however, and this lead to NFS4ERR_SEQ_MISMATCH for the next several
RPC calls.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index b8e1ac6..e7e2077 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -444,8 +444,8 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
        if (res->sr_status == 1)
                res->sr_status = NFS_OK;
 
-       /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
-       if (!res->sr_slot)
+       /* don't increment the sequence number if the task wasn't sent */
+       if (!RPC_WAS_SENT(task))
                goto out;
 
        /* Check the SEQUENCE operation status */

diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index d81db80..3b94f80 100644 (file)
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -127,6 +127,7 @@ struct rpc_task_setup {
 #define RPC_TASK_KILLED                0x0100          /* task was killed */
 #define RPC_TASK_SOFT          0x0200          /* Use soft timeouts */
 #define RPC_TASK_SOFTCONN      0x0400          /* Fail if can't connect */
+#define RPC_TASK_SENT          0x0800          /* message was sent */
 
 #define RPC_IS_ASYNC(t)                ((t)->tk_flags & RPC_TASK_ASYNC)
 #define RPC_IS_SWAPPER(t)      ((t)->tk_flags & RPC_TASK_SWAPPER)
@@ -134,6 +135,7 @@ struct rpc_task_setup {
 #define RPC_ASSASSINATED(t)    ((t)->tk_flags & RPC_TASK_KILLED)
 #define RPC_IS_SOFT(t)         ((t)->tk_flags & RPC_TASK_SOFT)
 #define RPC_IS_SOFTCONN(t)     ((t)->tk_flags & RPC_TASK_SOFTCONN)
+#define RPC_WAS_SENT(t)                ((t)->tk_flags & RPC_TASK_SENT)
 
 #define RPC_TASK_RUNNING       0
 #define RPC_TASK_QUEUED                1

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 9494c37..ce5eb68 100644 (file)
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -906,6 +906,7 @@ void xprt_transmit(struct rpc_task *task)
        }
 
        dprintk("RPC: %5u xmit complete\n", task->tk_pid);
+       task->tk_flags |= RPC_TASK_SENT;
        spin_lock_bh(&xprt->transport_lock);
 
        xprt->ops->set_retrans_timeout(task);