include/uapi/linux/nfsd/cld.h

   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 */