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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * Upcall description for nfsdcld communication
4 *
5 * Copyright (c) 2012 Red Hat, Inc.
6 * Author(s): Jeff Layton <jlayton@redhat.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#ifndef _NFSD_CLD_H
24#define _NFSD_CLD_H
25
26#include <linux/types.h>
27
28/* latest upcall version available */
29#define CLD_UPCALL_VERSION 1
30
31/* defined by RFC3530 */
32#define NFS4_OPAQUE_LIMIT 1024
33
34enum cld_command {
35 Cld_Create, /* create a record for this cm_id */
36 Cld_Remove, /* remove record of this cm_id */
37 Cld_Check, /* is this cm_id allowed? */
38 Cld_GraceDone, /* grace period is complete */
39 Cld_GraceStart,
40};
41
42/* representation of long-form NFSv4 client ID */
43struct cld_name {
44 __u16 cn_len; /* length of cm_id */
45 unsigned char cn_id[NFS4_OPAQUE_LIMIT]; /* client-provided */
46} __attribute__((packed));
47
48/* message struct for communication with userspace */
49struct cld_msg {
50 __u8 cm_vers; /* upcall version */
51 __u8 cm_cmd; /* upcall command */
52 __s16 cm_status; /* return code */
53 __u32 cm_xid; /* transaction id */
54 union {
55 __s64 cm_gracetime; /* grace period start time */
56 struct cld_name cm_name;
57 } __attribute__((packed)) cm_u;
58} __attribute__((packed));
59
60#endif /* !_NFSD_CLD_H */