nfsd41: allow non-reclaim open-by-fh's in 4.1

With NFSv4.0 it was safe to assume that open-by-filehandles were always
reclaims.

With NFSv4.1 there are non-reclaim open-by-filehandle operations, so we
should ensure we're only insisting on reclaims in the
OPEN_CLAIM_PREVIOUS case.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4proc.c

@@ -266,10 +266,6 @@ do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_
 {
 	__be32 status;
 
-	/* Only reclaims from previously confirmed clients are valid */
-	if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
-		return status;
-
 	/* We don't know the target directory, and therefore can not
 	* set the change info
 	*/
@@ -373,6 +369,9 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 			break;
 		case NFS4_OPEN_CLAIM_PREVIOUS:
 			open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
+			status = nfs4_check_open_reclaim(&open->op_clientid);
+			if (status)
+				goto out;
 		case NFS4_OPEN_CLAIM_FH:
 		case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 			status = do_open_fhandle(rqstp, &cstate->current_fh,