NFSv4: Handle RPC level errors in LAYOUTRETURN

Handle RPC level errors by assuming that the RPC call was successful.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 6436047..abc7188 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1455,6 +1455,21 @@ int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
 	case 0:
 		retval = 0;
 		break;
+	case -NFS4ERR_NOMATCHING_LAYOUT:
+		/* Was there an RPC level error? If not, retry */
+		if (task->tk_rpc_status == 0)
+			break;
+		/* If the call was not sent, let caller handle it */
+		if (!RPC_WAS_SENT(task))
+			return 0;
+		/*
+		 * Otherwise, assume the call succeeded and
+		 * that we need to release the layout
+		 */
+		*ret = 0;
+		(*respp)->lrs_present = 0;
+		retval = 0;
+		break;
 	case -NFS4ERR_DELAY:
 		/* Let the caller handle the retry */
 		*ret = -NFS4ERR_NOMATCHING_LAYOUT;