/* SPDX-License-Identifier: GPL-2.0 */
/* XDR types for nfsd. This is mainly a typing exercise. */

#ifndef LINUX_NFSD_H
#define LINUX_NFSD_H

#include <linux/vfs.h>
#include "nfsd.h"
#include "nfsfh.h"

struct nfsd_fhandle {
        struct svc_fh           fh;
};

struct nfsd_sattrargs {
        struct svc_fh           fh;
        struct iattr            attrs;
};

struct nfsd_diropargs {
        struct svc_fh           fh;
        char *                  name;
        unsigned int            len;
};

struct nfsd_readargs {
        struct svc_fh           fh;
        __u32                   offset;
        __u32                   count;
};

struct nfsd_writeargs {
        svc_fh                  fh;
        __u32                   offset;
        __u32                   len;
        struct xdr_buf          payload;
};

struct nfsd_createargs {
        struct svc_fh           fh;
        char *                  name;
        unsigned int            len;
        struct iattr            attrs;
};

struct nfsd_renameargs {
        struct svc_fh           ffh;
        char *                  fname;
        unsigned int            flen;
        struct svc_fh           tfh;
        char *                  tname;
        unsigned int            tlen;
};

struct nfsd_linkargs {
        struct svc_fh           ffh;
        struct svc_fh           tfh;
        char *                  tname;
        unsigned int            tlen;
};

struct nfsd_symlinkargs {
        struct svc_fh           ffh;
        char *                  fname;
        unsigned int            flen;
        char *                  tname;
        unsigned int            tlen;
        struct iattr            attrs;
        struct kvec             first;
};

struct nfsd_readdirargs {
        struct svc_fh           fh;
        __u32                   cookie;
        __u32                   count;
};

struct nfsd_stat {
        __be32                  status;
};

struct nfsd_attrstat {
        __be32                  status;
        struct svc_fh           fh;
        struct kstat            stat;
};

struct nfsd_diropres  {
        __be32                  status;
        struct svc_fh           fh;
        struct kstat            stat;
};

struct nfsd_readlinkres {
        __be32                  status;
        int                     len;
        struct page             *page;
};

struct nfsd_readres {
        __be32                  status;
        struct svc_fh           fh;
        unsigned long           count;
        struct kstat            stat;
        struct page             **pages;
};

struct nfsd_readdirres {
        /* Components of the reply */
        __be32                  status;

        int                     count;

        /* Used to encode the reply's entry list */
        struct xdr_stream       xdr;
        struct xdr_buf          dirlist;
        struct readdir_cd       common;
        unsigned int            cookie_offset;
};

struct nfsd_statfsres {
        __be32                  status;
        struct kstatfs          stats;
};

/*
 * Storage requirements for XDR arguments and results.
 */
union nfsd_xdrstore {
        struct nfsd_sattrargs   sattr;
        struct nfsd_diropargs   dirop;
        struct nfsd_readargs    read;
        struct nfsd_writeargs   write;
        struct nfsd_createargs  create;
        struct nfsd_renameargs  rename;
        struct nfsd_linkargs    link;
        struct nfsd_symlinkargs symlink;
        struct nfsd_readdirargs readdir;
};

#define NFS2_SVC_XDRSIZE        sizeof(union nfsd_xdrstore)


bool nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);

bool nfssvc_encode_statres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_encode_attrstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_encode_diropres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_encode_statfsres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
bool nfssvc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr);

void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset);
int nfssvc_encode_entry(void *data, const char *name, int namlen,
                        loff_t offset, u64 ino, unsigned int d_type);

void nfssvc_release_attrstat(struct svc_rqst *rqstp);
void nfssvc_release_diropres(struct svc_rqst *rqstp);
void nfssvc_release_readres(struct svc_rqst *rqstp);

/* Helper functions for NFSv2 ACL code */
bool svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp);
bool svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status);
bool svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
                         const struct svc_fh *fhp, const struct kstat *stat);

#endif /* LINUX_NFSD_H */