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 (at) 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 34 enum 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 }; 40 41 /* representation of long-form NFSv4 client ID */ 42 struct cld_name { 43 __u16 cn_len; /* length of cm_id */ 44 unsigned char cn_id[NFS4_OPAQUE_LIMIT]; /* client-provided */ 45 } __attribute__((packed)); 46 47 /* message struct for communication with userspace */ 48 struct cld_msg { 49 __u8 cm_vers; /* upcall version */ 50 __u8 cm_cmd; /* upcall command */ 51 __s16 cm_status; /* return code */ 52 __u32 cm_xid; /* transaction id */ 53 union { 54 __s64 cm_gracetime; /* grace period start time */ 55 struct cld_name cm_name; 56 } __attribute__((packed)) cm_u; 57 } __attribute__((packed)); 58 59 #endif /* !_NFSD_CLD_H */ 60
