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Commit 0ab628d8 authored by Jeff Layton's avatar Jeff Layton Committed by J. Bruce Fields
Browse files

nfsd: add a header describing upcall to nfsdcld 



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

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 7ea34ac1

include/linux/nfsd/cld.h

0 → 100644
+56 −0
Original line number Diff line number Diff line 
/*

 * 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 */