nfsd41: make sure nfs server process OPEN with EXCLUSIVE4_1 correctly

The NFS server uses nfsd_create_v3 to handle EXCLUSIVE4_1 opens, but
that function is not prepared to handle them.

Rename nfsd_create_v3() to do_nfsd_create(), and add handling of
EXCLUSIVE4_1.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index ad32568..3a6dbd7 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -196,9 +196,9 @@
 
 		/*
 		 * Note: create modes (UNCHECKED,GUARDED...) are the same
-		 * in NFSv4 as in v3.
+		 * in NFSv4 as in v3 except EXCLUSIVE4_1.
 		 */
-		status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
+		status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 					open->op_fname.len, &open->op_iattr,
 					&resfh, open->op_createmode,
 					(u32 *)open->op_verf.data,