| Jeff Layton | 0ab628d | 2012-03-21 09:52:06 -0400 | [diff] [blame] | 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 */ |