1 /* 2 * Upcall description for nfsdcld communication 3 * 4 * Copyright (c) 2012 Red Hat, Inc. 5 * Author(s): Jeff Layton <jlayton@redhat.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #ifndef _NFSD_CLD_H 23 #define _NFSD_CLD_H 24 25 /* latest upcall version available */ 26 #define CLD_UPCALL_VERSION 1 27 28 /* defined by RFC3530 */ 29 #define NFS4_OPAQUE_LIMIT 1024 30 31 enum cld_command { 32 Cld_Create, /* create a record for this cm_id */ 33 Cld_Remove, /* remove record of this cm_id */ 34 Cld_Check, /* is this cm_id allowed? */ 35 Cld_GraceDone, /* grace period is complete */ 36 }; 37 38 /* representation of long-form NFSv4 client ID */ 39 struct cld_name { 40 uint16_t cn_len; /* length of cm_id */ 41 unsigned char cn_id[NFS4_OPAQUE_LIMIT]; /* client-provided */ 42 } __attribute__((packed)); 43 44 /* message struct for communication with userspace */ 45 struct cld_msg { 46 uint8_t cm_vers; /* upcall version */ 47 uint8_t cm_cmd; /* upcall command */ 48 int16_t cm_status; /* return code */ 49 uint32_t cm_xid; /* transaction id */ 50 union { 51 int64_t cm_gracetime; /* grace period start time */ 52 struct cld_name cm_name; 53 } __attribute__((packed)) cm_u; 54 } __attribute__((packed)); 55 56 #endif /* !_NFSD_CLD_H */ 57