/* SPDX-License-Identifier: GPL-2.0 */
/*
 * linux/include/linux/lockd/xdr.h
 *
 * XDR types for the NLM protocol
 *
 * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
 */

#ifndef LOCKD_XDR_H
#define LOCKD_XDR_H

#include <linux/fs.h>
#include <linux/filelock.h>
#include <linux/nfs.h>
#include <linux/sunrpc/xdr.h>

#define SM_MAXSTRLEN            1024
#define SM_PRIV_SIZE            16

struct nsm_private {
        unsigned char           data[SM_PRIV_SIZE];
};

struct svc_rqst;

#define NLM_MAXCOOKIELEN        32
#define NLM_MAXSTRLEN           1024

#define nlm_granted             cpu_to_be32(NLM_LCK_GRANTED)
#define nlm_lck_denied          cpu_to_be32(NLM_LCK_DENIED)
#define nlm_lck_denied_nolocks  cpu_to_be32(NLM_LCK_DENIED_NOLOCKS)
#define nlm_lck_blocked         cpu_to_be32(NLM_LCK_BLOCKED)
#define nlm_lck_denied_grace_period     cpu_to_be32(NLM_LCK_DENIED_GRACE_PERIOD)

#define nlm_drop_reply          cpu_to_be32(30000)

/* Lock info passed via NLM */
struct nlm_lock {
        char *                  caller;
        unsigned int            len;    /* length of "caller" */
        struct nfs_fh           fh;
        struct xdr_netobj       oh;
        u32                     svid;
        u64                     lock_start;
        u64                     lock_len;
        struct file_lock        fl;
};

/*
 *      NLM cookies. Technically they can be 1K, but Linux only uses 8 bytes.
 *      FreeBSD uses 16, Apple Mac OS X 10.3 uses 20. Therefore we set it to
 *      32 bytes.
 */

struct nlm_cookie
{
        unsigned char data[NLM_MAXCOOKIELEN];
        unsigned int len;
};

/*
 * Generic lockd arguments for all but sm_notify
 */
struct nlm_args {
        struct nlm_cookie       cookie;
        struct nlm_lock         lock;
        u32                     block;
        u32                     reclaim;
        u32                     state;
        u32                     monitor;
        u32                     fsm_access;
        u32                     fsm_mode;
};

/*
 * Generic lockd result
 */
struct nlm_res {
        struct nlm_cookie       cookie;
        __be32                  status;
        struct nlm_lock         lock;
};

/*
 * statd callback when client has rebooted
 */
struct nlm_reboot {
        char                    *mon;
        unsigned int            len;
        u32                     state;
        struct nsm_private      priv;
};

/*
 * Contents of statd callback when monitored host rebooted
 */
#define NLMSVC_XDRSIZE          sizeof(struct nlm_args)

bool    nlmsvc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr);

bool    nlmsvc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool    nlmsvc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr);

#endif /* LOCKD_XDR_H */