/*
 * linux/fs/nfsd/nfs3xdr.c
 *
 * XDR support for nfsd/protocol version 3.
 *
 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/time.h>
#include <linux/nfs3.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/dcache.h>
#include <linux/namei.h>

#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/xdr3.h>

#define NFSDDBG_FACILITY                NFSDDBG_XDR

#ifdef NFSD_OPTIMIZE_SPACE
# define inline
#endif


/*
 * Mapping of S_IF* types to NFS file types
 */
static u32      nfs3_ftypes[] = {
        NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
        NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
        NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
        NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
};

/*
 * XDR functions for basic NFS types
 */
static inline u32 *
encode_time3(u32 *p, time_t secs)
{
        *p++ = htonl((u32) secs); *p++ = 0;
        return p;
}

static inline u32 *
decode_time3(u32 *p, time_t *secp)
{
        *secp = ntohl(*p++);
        return p + 1;
}

static inline u32 *
decode_fh(u32 *p, struct svc_fh *fhp)
{
        int size;
        fh_init(fhp, NFS3_FHSIZE);
        size = ntohl(*p++);
        if (size > NFS3_FHSIZE)
                return NULL;

        memcpy(&fhp->fh_handle.fh_base, p, size);
        fhp->fh_handle.fh_size = size;
        return p + XDR_QUADLEN(size);
}

static inline u32 *
encode_fh(u32 *p, struct svc_fh *fhp)
{
        int size = fhp->fh_handle.fh_size;
        *p++ = htonl(size);
        if (size) p[XDR_QUADLEN(size)-1]=0;
        memcpy(p, &fhp->fh_handle.fh_base, size);
        return p + XDR_QUADLEN(size);
}

/*
 * Decode a file name and make sure that the path contains
 * no slashes or null bytes.
 */
static inline u32 *
decode_filename(u32 *p, char **namp, int *lenp)
{
        char            *name;
        int             i;

        if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
                for (i = 0, name = *namp; i < *lenp; i++, name++) {
                        if (*name == '\0' || *name == '/')
                                return NULL;
                }
        }

        return p;
}

static inline u32 *
decode_pathname(u32 *p, char **namp, int *lenp)
{
        char            *name;
        int             i;

        if ((p = xdr_decode_string(p, namp, lenp, NFS3_MAXPATHLEN)) != NULL) {
                for (i = 0, name = *namp; i < *lenp; i++, name++) {
                        if (*name == '\0')
                                return NULL;
                }
        }

        return p;
}

static inline u32 *
decode_sattr3(u32 *p, struct iattr *iap)
{
        u32     tmp;

        iap->ia_valid = 0;

        if (*p++) {
                iap->ia_valid |= ATTR_MODE;
                iap->ia_mode = ntohl(*p++);
        }
        if (*p++) {
                iap->ia_valid |= ATTR_UID;
                iap->ia_uid = ntohl(*p++);
        }
        if (*p++) {
                iap->ia_valid |= ATTR_GID;
                iap->ia_gid = ntohl(*p++);
        }
        if (*p++) {
                u64     newsize;

                iap->ia_valid |= ATTR_SIZE;
                p = xdr_decode_hyper(p, &newsize);
                if (newsize <= NFS_OFFSET_MAX)
                        iap->ia_size = newsize;
                else
                        iap->ia_size = NFS_OFFSET_MAX;
        }
        if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
                iap->ia_valid |= ATTR_ATIME;
        } else if (tmp == 2) {          /* set to client time */
                iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
                iap->ia_atime = ntohl(*p++), p++;
        }
        if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
                iap->ia_valid |= ATTR_MTIME;
        } else if (tmp == 2) {          /* set to client time */
                iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
                iap->ia_mtime = ntohl(*p++), p++;
        }
        return p;
}

static inline u32 *
encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
        struct vfsmount *mnt = fhp->fh_export->ex_mnt;
        struct dentry   *dentry = fhp->fh_dentry;
        struct kstat stat;

        vfs_getattr(mnt, dentry, &stat);

        *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]);
        *p++ = htonl((u32) stat.mode);
        *p++ = htonl((u32) stat.nlink);
        *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
        *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
        if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) {
                p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
        } else {
                p = xdr_encode_hyper(p, (u64) stat.size);
        }
        p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9);
        *p++ = htonl((u32) MAJOR(stat.rdev));
        *p++ = htonl((u32) MINOR(stat.rdev));
        if (rqstp->rq_reffh->fh_version == 1
            && rqstp->rq_reffh->fh_fsid_type == 1
            && (fhp->fh_export->ex_flags & NFSEXP_FSID))
                p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
        else
                p = xdr_encode_hyper(p, (u64) stat.dev);
        p = xdr_encode_hyper(p, (u64) stat.ino);
        p = encode_time3(p, stat.atime);
        p = encode_time3(p, lease_get_mtime(dentry->d_inode));
        p = encode_time3(p, stat.ctime);

        return p;
}

static inline u32 *
encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
        struct inode    *inode = fhp->fh_dentry->d_inode;

        /* Attributes to follow */
        *p++ = xdr_one;

        *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
        *p++ = htonl((u32) fhp->fh_post_mode);
        *p++ = htonl((u32) fhp->fh_post_nlink);
        *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
        *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
        if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
                p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
        } else {
                p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
        }
        p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
        *p++ = htonl((u32) major(fhp->fh_post_rdev));
        *p++ = htonl((u32) minor(fhp->fh_post_rdev));
        if (rqstp->rq_reffh->fh_version == 1
            && rqstp->rq_reffh->fh_fsid_type == 1
            && (fhp->fh_export->ex_flags & NFSEXP_FSID))
                p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
        else
                p = xdr_encode_hyper(p, (u64) inode->i_dev);
        p = xdr_encode_hyper(p, (u64) inode->i_ino);
        p = encode_time3(p, fhp->fh_post_atime);
        p = encode_time3(p, fhp->fh_post_mtime);
        p = encode_time3(p, fhp->fh_post_ctime);

        return p;
}

/*
 * Encode post-operation attributes.
 * The inode may be NULL if the call failed because of a stale file
 * handle. In this case, no attributes are returned.
 */
static u32 *
encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
        struct dentry *dentry = fhp->fh_dentry;
        if (dentry && dentry->d_inode != NULL) {
                *p++ = xdr_one;         /* attributes follow */
                return encode_fattr3(rqstp, p, fhp);
        }
        *p++ = xdr_zero;
        return p;
}

/*
 * Enocde weak cache consistency data
 */
static u32 *
encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
        struct dentry   *dentry = fhp->fh_dentry;

        if (dentry && dentry->d_inode && fhp->fh_post_saved) {
                if (fhp->fh_pre_saved) {
                        *p++ = xdr_one;
                        p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
                        p = encode_time3(p, fhp->fh_pre_mtime);
                        p = encode_time3(p, fhp->fh_pre_ctime);
                } else {
                        *p++ = xdr_zero;
                }
                return encode_saved_post_attr(rqstp, p, fhp);
        }
        /* no pre- or post-attrs */
        *p++ = xdr_zero;
        return encode_post_op_attr(rqstp, p, fhp);
}

/*
 * Check buffer bounds after decoding arguments
 */
static inline int
xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
{
        struct svc_buf  *buf = &rqstp->rq_argbuf;

        return p - buf->base <= buf->buflen;
}

static inline int
xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
{
        struct svc_buf  *buf = &rqstp->rq_resbuf;

        buf->len = p - buf->base;
        dprintk("nfsd: ressize_check p %p base %p len %d\n",
                        p, buf->base, buf->buflen);
        return (buf->len <= buf->buflen);
}

/*
 * XDR decode functions
 */
int
nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
        if (!(p = decode_fh(p, fhp)))
                return 0;
        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_sattrargs *args)
{
        if (!(p = decode_fh(p, &args->fh))
         || !(p = decode_sattr3(p, &args->attrs)))
                return 0;

        if ((args->check_guard = ntohl(*p++)) != 0)
                p = decode_time3(p, &args->guardtime);

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_diropargs *args)
{
        if (!(p = decode_fh(p, &args->fh))
         || !(p = decode_filename(p, &args->name, &args->len)))
                return 0;

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_accessargs *args)
{
        if (!(p = decode_fh(p, &args->fh)))
                return 0;
        args->access = ntohl(*p++);

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_readargs *args)
{
        if (!(p = decode_fh(p, &args->fh))
         || !(p = xdr_decode_hyper(p, &args->offset)))
                return 0;

        args->count = ntohl(*p++);
        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_writeargs *args)
{
        if (!(p = decode_fh(p, &args->fh))
         || !(p = xdr_decode_hyper(p, &args->offset)))
                return 0;

        args->count = ntohl(*p++);
        args->stable = ntohl(*p++);
        args->len = ntohl(*p++);
        args->data = (char *) p;
        p += XDR_QUADLEN(args->len);

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_createargs *args)
{
        if (!(p = decode_fh(p, &args->fh))
         || !(p = decode_filename(p, &args->name, &args->len)))
                return 0;

        switch (args->createmode = ntohl(*p++)) {
        case NFS3_CREATE_UNCHECKED:
        case NFS3_CREATE_GUARDED:
                if (!(p = decode_sattr3(p, &args->attrs)))
                        return 0;
                break;
        case NFS3_CREATE_EXCLUSIVE:
                args->verf = p;
                p += 2;
                break;
        default:
                return 0;
        }

        return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_createargs *args)
{
        if (!(p = decode_fh(p, &args->fh))
         || !(p = decode_filename(p, &args->name, &args->len))
         || !(p = decode_sattr3(p, &args->attrs)))
                return 0;

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_symlinkargs *args)
{
        if (!(p = decode_fh(p, &args->ffh))
         || !(p = decode_filename(p, &args->fname, &args->flen))
         || !(p = decode_sattr3(p, &args->attrs))
         || !(p = decode_pathname(p, &args->tname, &args->tlen)))
                return 0;

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_mknodargs *args)
{
        if (!(p = decode_fh(p, &args->fh))
         || !(p = decode_filename(p, &args->name, &args->len)))
                return 0;

        args->ftype = ntohl(*p++);

        if (args->ftype == NF3BLK  || args->ftype == NF3CHR
         || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
                if (!(p = decode_sattr3(p, &args->attrs)))
                        return 0;
        }

        if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
                args->major = ntohl(*p++);
                args->minor = ntohl(*p++);
        }

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_renameargs *args)
{
        if (!(p = decode_fh(p, &args->ffh))
         || !(p = decode_filename(p, &args->fname, &args->flen))
         || !(p = decode_fh(p, &args->tfh))
         || !(p = decode_filename(p, &args->tname, &args->tlen)))
                return 0;

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_linkargs *args)
{
        if (!(p = decode_fh(p, &args->ffh))
         || !(p = decode_fh(p, &args->tfh))
         || !(p = decode_filename(p, &args->tname, &args->tlen)))
                return 0;

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_readdirargs *args)
{
        if (!(p = decode_fh(p, &args->fh)))
                return 0;
        p = xdr_decode_hyper(p, &args->cookie);
        args->verf   = p; p += 2;
        args->dircount = ~0;
        args->count  = ntohl(*p++);

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_readdirargs *args)
{
        if (!(p = decode_fh(p, &args->fh)))
                return 0;
        p = xdr_decode_hyper(p, &args->cookie);
        args->verf     = p; p += 2;
        args->dircount = ntohl(*p++);
        args->count    = ntohl(*p++);

        return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_commitargs *args)
{
        if (!(p = decode_fh(p, &args->fh)))
                return 0;
        p = xdr_decode_hyper(p, &args->offset);
        args->count = ntohl(*p++);

        return xdr_argsize_check(rqstp, p);
}

/*
 * XDR encode functions
 */
/*
 * There must be an encoding function for void results so svc_process
 * will work properly.
 */
int
nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
{
        return xdr_ressize_check(rqstp, p);
}

/* GETATTR */
int
nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_attrstat *resp)
{
        if (resp->status == 0)
                p = encode_fattr3(rqstp, p, &resp->fh);
        return xdr_ressize_check(rqstp, p);
}

/* SETATTR, REMOVE, RMDIR */
int
nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_attrstat *resp)
{
        p = encode_wcc_data(rqstp, p, &resp->fh);
        return xdr_ressize_check(rqstp, p);
}

/* LOOKUP */
int
nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_diropres *resp)
{
        if (resp->status == 0) {
                p = encode_fh(p, &resp->fh);
                p = encode_post_op_attr(rqstp, p, &resp->fh);
        }
        p = encode_post_op_attr(rqstp, p, &resp->dirfh);
        return xdr_ressize_check(rqstp, p);
}

/* ACCESS */
int
nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_accessres *resp)
{
        p = encode_post_op_attr(rqstp, p, &resp->fh);
        if (resp->status == 0)
                *p++ = htonl(resp->access);
        return xdr_ressize_check(rqstp, p);
}

/* READLINK */
int
nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_readlinkres *resp)
{
        p = encode_post_op_attr(rqstp, p, &resp->fh);
        if (resp->status == 0) {
                *p++ = htonl(resp->len);
                p += XDR_QUADLEN(resp->len);
        }
        return xdr_ressize_check(rqstp, p);
}

/* READ */
int
nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_readres *resp)
{
        p = encode_post_op_attr(rqstp, p, &resp->fh);
        if (resp->status == 0) {
                *p++ = htonl(resp->count);
                *p++ = htonl(resp->eof);
                *p++ = htonl(resp->count);      /* xdr opaque count */
                p += XDR_QUADLEN(resp->count);
        }
        return xdr_ressize_check(rqstp, p);
}

/* WRITE */
int
nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_writeres *resp)
{
        p = encode_wcc_data(rqstp, p, &resp->fh);
        if (resp->status == 0) {
                *p++ = htonl(resp->count);
                *p++ = htonl(resp->committed);
                *p++ = htonl(nfssvc_boot.tv_sec);
                *p++ = htonl(nfssvc_boot.tv_usec);
        }
        return xdr_ressize_check(rqstp, p);
}

/* CREATE, MKDIR, SYMLINK, MKNOD */
int
nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_diropres *resp)
{
        if (resp->status == 0) {
                *p++ = xdr_one;
                p = encode_fh(p, &resp->fh);
                p = encode_post_op_attr(rqstp, p, &resp->fh);
        }
        p = encode_wcc_data(rqstp, p, &resp->dirfh);
        return xdr_ressize_check(rqstp, p);
}

/* RENAME */
int
nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_renameres *resp)
{
        p = encode_wcc_data(rqstp, p, &resp->ffh);
        p = encode_wcc_data(rqstp, p, &resp->tfh);
        return xdr_ressize_check(rqstp, p);
}

/* LINK */
int
nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_linkres *resp)
{
        p = encode_post_op_attr(rqstp, p, &resp->fh);
        p = encode_wcc_data(rqstp, p, &resp->tfh);
        return xdr_ressize_check(rqstp, p);
}

/* READDIR */
int
nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_readdirres *resp)
{
        p = encode_post_op_attr(rqstp, p, &resp->fh);
        if (resp->status == 0) {
                /* stupid readdir cookie */
                memcpy(p, resp->verf, 8); p += 2;
                p += XDR_QUADLEN(resp->count);
        }

        return xdr_ressize_check(rqstp, p);
}

/*
 * Encode a directory entry. This one works for both normal readdir
 * and readdirplus.
 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 * 
 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 * file handle.
 */

#define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
#define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
static int
encode_entry(struct readdir_cd *cd, const char *name,
             int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
{
        u32             *p = cd->buffer;
        int             buflen, slen, elen;

        if (cd->offset)
                xdr_encode_hyper(cd->offset, (u64) offset);

        /* nfsd_readdir calls us with name == 0 when it wants us to
         * set the last offset entry. */
        if (name == 0)
                return 0;

        /*
        dprintk("encode_entry(%.*s @%ld%s)\n",
                namlen, name, (long) offset, plus? " plus" : "");
         */

        /* truncate filename if too long */
        if (namlen > NFS3_MAXNAMLEN)
                namlen = NFS3_MAXNAMLEN;

        slen = XDR_QUADLEN(namlen);
        elen = slen + NFS3_ENTRY_BAGGAGE
                + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
        if ((buflen = cd->buflen - elen) < 0) {
                cd->eob = 1;
                return -EINVAL;
        }
        *p++ = xdr_one;                          /* mark entry present */
        p    = xdr_encode_hyper(p, ino);         /* file id */
        p    = xdr_encode_array(p, name, namlen);/* name length & name */

        cd->offset = p;                 /* remember pointer */
        p = xdr_encode_hyper(p, NFS_OFFSET_MAX);        /* offset of next entry */

        /* throw in readdirplus baggage */
        if (plus) {
                struct svc_fh   fh;
                struct svc_export       *exp;
                struct dentry           *dparent, *dchild;

                dparent = cd->dirfh->fh_dentry;
                exp  = cd->dirfh->fh_export;

                fh_init(&fh, NFS3_FHSIZE);
                if (isdotent(name, namlen)) {
                        if (namlen == 2) {
                                read_lock(&dparent_lock);
                                dchild = dget(dparent->d_parent);
                                read_unlock(&dparent_lock);
                        } else
                                dchild = dget(dparent);
                } else
                        dchild = lookup_one_len(name, dparent,namlen);
                if (IS_ERR(dchild))
                        goto noexec;
                if (fh_compose(&fh, exp, dchild, cd->dirfh) != 0 || !dchild->d_inode)
                        goto noexec;
                p = encode_post_op_attr(cd->rqstp, p, &fh);
                *p++ = xdr_one; /* yes, a file handle follows */
                p = encode_fh(p, &fh);
                fh_put(&fh);
        }

out:
        cd->buflen = buflen;
        cd->buffer = p;
        return 0;

noexec:
        *p++ = 0;
        *p++ = 0;
        goto out;
}

int
nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
                     int namlen, loff_t offset, ino_t ino, unsigned int d_type)
{
        return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
}

int
nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
                          int namlen, loff_t offset, ino_t ino, unsigned int d_type)
{
        return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
}

/* FSSTAT */
int
nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_fsstatres *resp)
{
        struct statfs   *s = &resp->stats;
        u64             bs = s->f_bsize;

        *p++ = xdr_zero;        /* no post_op_attr */

        if (resp->status == 0) {
                p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
                p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
                p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
                p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
                p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
                p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
                *p++ = htonl(resp->invarsec);   /* mean unchanged time */
        }
        return xdr_ressize_check(rqstp, p);
}

/* FSINFO */
int
nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_fsinfores *resp)
{
        *p++ = xdr_zero;        /* no post_op_attr */

        if (resp->status == 0) {
                *p++ = htonl(resp->f_rtmax);
                *p++ = htonl(resp->f_rtpref);
                *p++ = htonl(resp->f_rtmult);
                *p++ = htonl(resp->f_wtmax);
                *p++ = htonl(resp->f_wtpref);
                *p++ = htonl(resp->f_wtmult);
                *p++ = htonl(resp->f_dtpref);
                p = xdr_encode_hyper(p, resp->f_maxfilesize);
                *p++ = xdr_one;
                *p++ = xdr_zero;
                *p++ = htonl(resp->f_properties);
        }

        return xdr_ressize_check(rqstp, p);
}

/* PATHCONF */
int
nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_pathconfres *resp)
{
        *p++ = xdr_zero;        /* no post_op_attr */

        if (resp->status == 0) {
                *p++ = htonl(resp->p_link_max);
                *p++ = htonl(resp->p_name_max);
                *p++ = htonl(resp->p_no_trunc);
                *p++ = htonl(resp->p_chown_restricted);
                *p++ = htonl(resp->p_case_insensitive);
                *p++ = htonl(resp->p_case_preserving);
        }

        return xdr_ressize_check(rqstp, p);
}

/* COMMIT */
int
nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_commitres *resp)
{
        p = encode_wcc_data(rqstp, p, &resp->fh);
        /* Write verifier */
        if (resp->status == 0) {
                *p++ = htonl(nfssvc_boot.tv_sec);
                *p++ = htonl(nfssvc_boot.tv_usec);
        }
        return xdr_ressize_check(rqstp, p);
}

/*
 * XDR release functions
 */
int
nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_attrstat *resp)
{
        fh_put(&resp->fh);
        return 1;
}

int
nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
                                        struct nfsd3_fhandle_pair *resp)
{
        fh_put(&resp->fh1);
        fh_put(&resp->fh2);
        return 1;
}