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nfsd: add a header describing upcall to nfsdcld

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The daemon takes a versioned binary struct. Hopefully this should allow
us to revise the struct later if it becomes necessary.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2012-03-21 09:52:06 -04:00 committed by J. Bruce Fields
parent 7ea34ac15e
commit 0ab628d856
1 changed files with 56 additions and 0 deletions
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56
include/linux/nfsd/cld.h Normal file
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/*
* Upcall description for nfsdcld communication
*
* Copyright (c) 2012 Red Hat, Inc.
* Author(s): Jeff Layton <jlayton@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _NFSD_CLD_H
#define _NFSD_CLD_H
/* latest upcall version available */
#define CLD_UPCALL_VERSION 1
/* defined by RFC3530 */
#define NFS4_OPAQUE_LIMIT 1024
enum cld_command {
Cld_Create, /* create a record for this cm_id */
Cld_Remove, /* remove record of this cm_id */
Cld_Check, /* is this cm_id allowed? */
Cld_GraceDone, /* grace period is complete */
};
/* representation of long-form NFSv4 client ID */
struct cld_name {
uint16_t cn_len; /* length of cm_id */
unsigned char cn_id[NFS4_OPAQUE_LIMIT]; /* client-provided */
} __attribute__((packed));
/* message struct for communication with userspace */
struct cld_msg {
uint8_t cm_vers; /* upcall version */
uint8_t cm_cmd; /* upcall command */
int16_t cm_status; /* return code */
uint32_t cm_xid; /* transaction id */
union {
int64_t cm_gracetime; /* grace period start time */
struct cld_name cm_name;
} __attribute__((packed)) cm_u;
} __attribute__((packed));
#endif /* !_NFSD_CLD_H */