nfs41: add support for the exclusive create flags
In v4.1 the client MUST/SHOULD use the EXCLUSIVE4_1 flag instead of
EXCLUSIVE4, and GUARDED when the server supports persistent sessions.
For now (and until we support suppattr_exclcreat), we don't send any
attributes with EXCLUSIVE4_1 relying in the subsequent SETATTR as in v4.0
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 3a71b40..0b1f3fc 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -51,6 +51,7 @@
#include <linux/nfs_fs.h>
#include <linux/nfs_idmap.h>
#include "nfs4_fs.h"
+#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_XDR
@@ -134,7 +135,7 @@
#define decode_lookup_maxsz (op_decode_hdr_maxsz)
#define encode_share_access_maxsz \
(2)
-#define encode_createmode_maxsz (1 + encode_attrs_maxsz)
+#define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
#define encode_opentype_maxsz (1 + encode_createmode_maxsz)
#define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
#define encode_open_maxsz (op_encode_hdr_maxsz + \
@@ -1140,6 +1141,7 @@
static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
__be32 *p;
+ struct nfs_client *clp;
p = reserve_space(xdr, 4);
switch(arg->open_flags & O_EXCL) {
@@ -1148,8 +1150,23 @@
encode_attrs(xdr, arg->u.attrs, arg->server);
break;
default:
- *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
- encode_nfs4_verifier(xdr, &arg->u.verifier);
+ clp = arg->server->nfs_client;
+ if (clp->cl_minorversion > 0) {
+ if (nfs4_has_persistent_session(clp)) {
+ *p = cpu_to_be32(NFS4_CREATE_GUARDED);
+ encode_attrs(xdr, arg->u.attrs, arg->server);
+ } else {
+ struct iattr dummy;
+
+ *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
+ encode_nfs4_verifier(xdr, &arg->u.verifier);
+ dummy.ia_valid = 0;
+ encode_attrs(xdr, &dummy, arg->server);
+ }
+ } else {
+ *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
+ encode_nfs4_verifier(xdr, &arg->u.verifier);
+ }
}
}