nfs3xdr.c

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/*
 * linux/fs/nfs/nfs3xdr.c
 *
 * XDR functions to encode/decode NFSv3 RPC arguments and results.
 *
 * Copyright (C) 1996, 1997 Olaf Kirch
 */

#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/kdev_t.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfsacl.h>
#include "internal.h"

#define NFSDBG_FACILITY     NFSDBG_XDR

/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO     EIO

/*
 * Declare the space requirements for NFS arguments and replies as
 * number of 32bit-words
 */
#define NFS3_fhandle_sz     (1+16)
#define NFS3_fh_sz      (NFS3_fhandle_sz)   /* shorthand */
#define NFS3_sattr_sz       (15)
#define NFS3_filename_sz    (1+(NFS3_MAXNAMLEN>>2))
#define NFS3_path_sz        (1+(NFS3_MAXPATHLEN>>2))
#define NFS3_fattr_sz       (21)
#define NFS3_cookieverf_sz  (NFS3_COOKIEVERFSIZE>>2)
#define NFS3_wcc_attr_sz    (6)
#define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
#define NFS3_post_op_attr_sz    (1+NFS3_fattr_sz)
#define NFS3_wcc_data_sz    (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
#define NFS3_diropargs_sz   (NFS3_fh_sz+NFS3_filename_sz)

#define NFS3_getattrargs_sz (NFS3_fh_sz)
#define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
#define NFS3_lookupargs_sz  (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_accessargs_sz  (NFS3_fh_sz+1)
#define NFS3_readlinkargs_sz    (NFS3_fh_sz)
#define NFS3_readargs_sz    (NFS3_fh_sz+3)
#define NFS3_writeargs_sz   (NFS3_fh_sz+5)
#define NFS3_createargs_sz  (NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_mkdirargs_sz   (NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
#define NFS3_mknodargs_sz   (NFS3_diropargs_sz+2+NFS3_sattr_sz)
#define NFS3_removeargs_sz  (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_renameargs_sz  (NFS3_diropargs_sz+NFS3_diropargs_sz)
#define NFS3_linkargs_sz        (NFS3_fh_sz+NFS3_diropargs_sz)
#define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
#define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
#define NFS3_commitargs_sz  (NFS3_fh_sz+3)

#define NFS3_getattrres_sz  (1+NFS3_fattr_sz)
#define NFS3_setattrres_sz  (1+NFS3_wcc_data_sz)
#define NFS3_removeres_sz   (NFS3_setattrres_sz)
#define NFS3_lookupres_sz   (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
#define NFS3_accessres_sz   (1+NFS3_post_op_attr_sz+1)
#define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
#define NFS3_readres_sz     (1+NFS3_post_op_attr_sz+3)
#define NFS3_writeres_sz    (1+NFS3_wcc_data_sz+4)
#define NFS3_createres_sz   (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_renameres_sz   (1+(2 * NFS3_wcc_data_sz))
#define NFS3_linkres_sz     (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_readdirres_sz  (1+NFS3_post_op_attr_sz+2)
#define NFS3_fsstatres_sz   (1+NFS3_post_op_attr_sz+13)
#define NFS3_fsinfores_sz   (1+NFS3_post_op_attr_sz+12)
#define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
#define NFS3_commitres_sz   (1+NFS3_wcc_data_sz+2)

#define ACL3_getaclargs_sz  (NFS3_fh_sz+1)
#define ACL3_setaclargs_sz  (NFS3_fh_sz+1+ \
                XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
#define ACL3_getaclres_sz   (1+NFS3_post_op_attr_sz+1+ \
                XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
#define ACL3_setaclres_sz   (1+NFS3_post_op_attr_sz)

static int nfs3_stat_to_errno(enum nfs_stat);

/*
 * Map file type to S_IFMT bits
 */
static const umode_t nfs_type2fmt[] = {
    [NF3BAD] = 0,
    [NF3REG] = S_IFREG,
    [NF3DIR] = S_IFDIR,
    [NF3BLK] = S_IFBLK,
    [NF3CHR] = S_IFCHR,
    [NF3LNK] = S_IFLNK,
    [NF3SOCK] = S_IFSOCK,
    [NF3FIFO] = S_IFIFO,
};

/*
 * While encoding arguments, set up the reply buffer in advance to
 * receive reply data directly into the page cache.
 */
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
                 unsigned int base, unsigned int len,
                 unsigned int bufsize)
{
    struct rpc_auth *auth = req->rq_cred->cr_auth;
    unsigned int replen;

    replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
    xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}

/*
 * Handle decode buffer overflows out-of-line.
 */
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
    dprintk("NFS: %s prematurely hit the end of our receive buffer. "
        "Remaining buffer length is %tu words.\n",
        func, xdr->end - xdr->p);
}


/*
 * Encode/decode NFSv3 basic data types
 *
 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
 *
 * Not all basic data types have their own encoding and decoding
 * functions.  For run-time efficiency, some data types are encoded
 * or decoded inline.
 */

static void encode_uint32(struct xdr_stream *xdr, u32 value)
{
    __be32 *p = xdr_reserve_space(xdr, 4);
    *p = cpu_to_be32(value);
}

static int decode_uint32(struct xdr_stream *xdr, u32 *value)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    *value = be32_to_cpup(p);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_uint64(struct xdr_stream *xdr, u64 *value)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 8);
    if (unlikely(p == NULL))
        goto out_overflow;
    xdr_decode_hyper(p, value);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * fileid3
 *
 *  typedef uint64 fileid3;
 */
static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
{
    return xdr_decode_hyper(p, fileid);
}

static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
{
    return decode_uint64(xdr, fileid);
}

/*
 * filename3
 *
 *  typedef string filename3<>;
 */
static void encode_filename3(struct xdr_stream *xdr,
                 const char *name, u32 length)
{
    __be32 *p;

    BUG_ON(length > NFS3_MAXNAMLEN);
    p = xdr_reserve_space(xdr, 4 + length);
    xdr_encode_opaque(p, name, length);
}

static int decode_inline_filename3(struct xdr_stream *xdr,
                   const char **name, u32 *length)
{
    __be32 *p;
    u32 count;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    count = be32_to_cpup(p);
    if (count > NFS3_MAXNAMLEN)
        goto out_nametoolong;
    p = xdr_inline_decode(xdr, count);
    if (unlikely(p == NULL))
        goto out_overflow;
    *name = (const char *)p;
    *length = count;
    return 0;

out_nametoolong:
    dprintk("NFS: returned filename too long: %u\n", count);
    return -ENAMETOOLONG;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * nfspath3
 *
 *  typedef string nfspath3<>;
 */
static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
                const u32 length)
{
    BUG_ON(length > NFS3_MAXPATHLEN);
    encode_uint32(xdr, length);
    xdr_write_pages(xdr, pages, 0, length);
}

static int decode_nfspath3(struct xdr_stream *xdr)
{
    u32 recvd, count;
    __be32 *p;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    count = be32_to_cpup(p);
    if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
        goto out_nametoolong;
    recvd = xdr_read_pages(xdr, count);
    if (unlikely(count > recvd))
        goto out_cheating;
    xdr_terminate_string(xdr->buf, count);
    return 0;

out_nametoolong:
    dprintk("NFS: returned pathname too long: %u\n", count);
    return -ENAMETOOLONG;
out_cheating:
    dprintk("NFS: server cheating in pathname result: "
        "count %u > recvd %u\n", count, recvd);
    return -EIO;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * cookie3
 *
 *  typedef uint64 cookie3
 */
static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
{
    return xdr_encode_hyper(p, cookie);
}

static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
{
    return decode_uint64(xdr, cookie);
}

/*
 * cookieverf3
 *
 *  typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
 */
static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
{
    memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
    return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
}

static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
    if (unlikely(p == NULL))
        goto out_overflow;
    memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * createverf3
 *
 *  typedef opaque createverf3[NFS3_CREATEVERFSIZE];
 */
static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
{
    __be32 *p;

    p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
    memcpy(p, verifier, NFS3_CREATEVERFSIZE);
}

static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
    if (unlikely(p == NULL))
        goto out_overflow;
    memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * size3
 *
 *  typedef uint64 size3;
 */
static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
{
    return xdr_decode_hyper(p, size);
}

/*
 * nfsstat3
 *
 *  enum nfsstat3 {
 *      NFS3_OK = 0,
 *      ...
 *  }
 */
#define NFS3_OK     NFS_OK

static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    *status = be32_to_cpup(p);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * ftype3
 *
 *  enum ftype3 {
 *      NF3REG  = 1,
 *      NF3DIR  = 2,
 *      NF3BLK  = 3,
 *      NF3CHR  = 4,
 *      NF3LNK  = 5,
 *      NF3SOCK = 6,
 *      NF3FIFO = 7
 *  };
 */
static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
{
    BUG_ON(type > NF3FIFO);
    encode_uint32(xdr, type);
}

static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
{
    u32 type;

    type = be32_to_cpup(p++);
    if (type > NF3FIFO)
        type = NF3NON;
    *mode = nfs_type2fmt[type];
    return p;
}

/*
 * specdata3
 *
 *     struct specdata3 {
 *             uint32  specdata1;
 *             uint32  specdata2;
 *     };
 */
static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
{
    __be32 *p;

    p = xdr_reserve_space(xdr, 8);
    *p++ = cpu_to_be32(MAJOR(rdev));
    *p = cpu_to_be32(MINOR(rdev));
}

static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
{
    unsigned int major, minor;

    major = be32_to_cpup(p++);
    minor = be32_to_cpup(p++);
    *rdev = MKDEV(major, minor);
    if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
        *rdev = 0;
    return p;
}

/*
 * nfs_fh3
 *
 *  struct nfs_fh3 {
 *      opaque       data<NFS3_FHSIZE>;
 *  };
 */
static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
{
    __be32 *p;

    BUG_ON(fh->size > NFS3_FHSIZE);
    p = xdr_reserve_space(xdr, 4 + fh->size);
    xdr_encode_opaque(p, fh->data, fh->size);
}

static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
    u32 length;
    __be32 *p;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    length = be32_to_cpup(p++);
    if (unlikely(length > NFS3_FHSIZE))
        goto out_toobig;
    p = xdr_inline_decode(xdr, length);
    if (unlikely(p == NULL))
        goto out_overflow;
    fh->size = length;
    memcpy(fh->data, p, length);
    return 0;
out_toobig:
    dprintk("NFS: file handle size (%u) too big\n", length);
    return -E2BIG;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static void zero_nfs_fh3(struct nfs_fh *fh)
{
    memset(fh, 0, sizeof(*fh));
}

/*
 * nfstime3
 *
 *  struct nfstime3 {
 *      uint32  seconds;
 *      uint32  nseconds;
 *  };
 */
static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
{
    *p++ = cpu_to_be32(timep->tv_sec);
    *p++ = cpu_to_be32(timep->tv_nsec);
    return p;
}

static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
{
    timep->tv_sec = be32_to_cpup(p++);
    timep->tv_nsec = be32_to_cpup(p++);
    return p;
}

/*
 * sattr3
 *
 *  enum time_how {
 *      DONT_CHANGE     = 0,
 *      SET_TO_SERVER_TIME  = 1,
 *      SET_TO_CLIENT_TIME  = 2
 *  };
 *
 *  union set_mode3 switch (bool set_it) {
 *  case TRUE:
 *      mode3   mode;
 *  default:
 *      void;
 *  };
 *
 *  union set_uid3 switch (bool set_it) {
 *  case TRUE:
 *      uid3    uid;
 *  default:
 *      void;
 *  };
 *
 *  union set_gid3 switch (bool set_it) {
 *  case TRUE:
 *      gid3    gid;
 *  default:
 *      void;
 *  };
 *
 *  union set_size3 switch (bool set_it) {
 *  case TRUE:
 *      size3   size;
 *  default:
 *      void;
 *  };
 *
 *  union set_atime switch (time_how set_it) {
 *  case SET_TO_CLIENT_TIME:
 *      nfstime3    atime;
 *  default:
 *      void;
 *  };
 *
 *  union set_mtime switch (time_how set_it) {
 *  case SET_TO_CLIENT_TIME:
 *      nfstime3  mtime;
 *  default:
 *      void;
 *  };
 *
 *  struct sattr3 {
 *      set_mode3   mode;
 *      set_uid3    uid;
 *      set_gid3    gid;
 *      set_size3   size;
 *      set_atime   atime;
 *      set_mtime   mtime;
 *  };
 */
static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
{
    u32 nbytes;
    __be32 *p;

    /*
     * In order to make only a single xdr_reserve_space() call,
     * pre-compute the total number of bytes to be reserved.
     * Six boolean values, one for each set_foo field, are always
     * present in the encoded result, so start there.
     */
    nbytes = 6 * 4;
    if (attr->ia_valid & ATTR_MODE)
        nbytes += 4;
    if (attr->ia_valid & ATTR_UID)
        nbytes += 4;
    if (attr->ia_valid & ATTR_GID)
        nbytes += 4;
    if (attr->ia_valid & ATTR_SIZE)
        nbytes += 8;
    if (attr->ia_valid & ATTR_ATIME_SET)
        nbytes += 8;
    if (attr->ia_valid & ATTR_MTIME_SET)
        nbytes += 8;
    p = xdr_reserve_space(xdr, nbytes);

    if (attr->ia_valid & ATTR_MODE) {
        *p++ = xdr_one;
        *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
    } else
        *p++ = xdr_zero;

    if (attr->ia_valid & ATTR_UID) {
        *p++ = xdr_one;
        *p++ = cpu_to_be32(attr->ia_uid);
    } else
        *p++ = xdr_zero;

    if (attr->ia_valid & ATTR_GID) {
        *p++ = xdr_one;
        *p++ = cpu_to_be32(attr->ia_gid);
    } else
        *p++ = xdr_zero;

    if (attr->ia_valid & ATTR_SIZE) {
        *p++ = xdr_one;
        p = xdr_encode_hyper(p, (u64)attr->ia_size);
    } else
        *p++ = xdr_zero;

    if (attr->ia_valid & ATTR_ATIME_SET) {
        *p++ = xdr_two;
        p = xdr_encode_nfstime3(p, &attr->ia_atime);
    } else if (attr->ia_valid & ATTR_ATIME) {
        *p++ = xdr_one;
    } else
        *p++ = xdr_zero;

    if (attr->ia_valid & ATTR_MTIME_SET) {
        *p++ = xdr_two;
        xdr_encode_nfstime3(p, &attr->ia_mtime);
    } else if (attr->ia_valid & ATTR_MTIME) {
        *p = xdr_one;
    } else
        *p = xdr_zero;
}

/*
 * fattr3
 *
 *  struct fattr3 {
 *      ftype3      type;
 *      mode3       mode;
 *      uint32      nlink;
 *      uid3        uid;
 *      gid3        gid;
 *      size3       size;
 *      size3       used;
 *      specdata3   rdev;
 *      uint64      fsid;
 *      fileid3     fileid;
 *      nfstime3    atime;
 *      nfstime3    mtime;
 *      nfstime3    ctime;
 *  };
 */
static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
    umode_t fmode;
    __be32 *p;

    p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
    if (unlikely(p == NULL))
        goto out_overflow;

    p = xdr_decode_ftype3(p, &fmode);

    fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
    fattr->nlink = be32_to_cpup(p++);
    fattr->uid = be32_to_cpup(p++);
    fattr->gid = be32_to_cpup(p++);

    p = xdr_decode_size3(p, &fattr->size);
    p = xdr_decode_size3(p, &fattr->du.nfs3.used);
    p = xdr_decode_specdata3(p, &fattr->rdev);

    p = xdr_decode_hyper(p, &fattr->fsid.major);
    fattr->fsid.minor = 0;

    p = xdr_decode_fileid3(p, &fattr->fileid);
    p = xdr_decode_nfstime3(p, &fattr->atime);
    p = xdr_decode_nfstime3(p, &fattr->mtime);
    xdr_decode_nfstime3(p, &fattr->ctime);
    fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);

    fattr->valid |= NFS_ATTR_FATTR_V3;
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * post_op_attr
 *
 *  union post_op_attr switch (bool attributes_follow) {
 *  case TRUE:
 *      fattr3  attributes;
 *  case FALSE:
 *      void;
 *  };
 */
static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    if (*p != xdr_zero)
        return decode_fattr3(xdr, fattr);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * wcc_attr
 *  struct wcc_attr {
 *      size3       size;
 *      nfstime3    mtime;
 *      nfstime3    ctime;
 *  };
 */
static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
    if (unlikely(p == NULL))
        goto out_overflow;

    fattr->valid |= NFS_ATTR_FATTR_PRESIZE
        | NFS_ATTR_FATTR_PRECHANGE
        | NFS_ATTR_FATTR_PREMTIME
        | NFS_ATTR_FATTR_PRECTIME;

    p = xdr_decode_size3(p, &fattr->pre_size);
    p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
    xdr_decode_nfstime3(p, &fattr->pre_ctime);
    fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);

    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * pre_op_attr
 *  union pre_op_attr switch (bool attributes_follow) {
 *  case TRUE:
 *      wcc_attr    attributes;
 *  case FALSE:
 *      void;
 *  };
 *
 * wcc_data
 *
 *  struct wcc_data {
 *      pre_op_attr before;
 *      post_op_attr    after;
 *  };
 */
static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    if (*p != xdr_zero)
        return decode_wcc_attr(xdr, fattr);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
    int error;

    error = decode_pre_op_attr(xdr, fattr);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, fattr);
out:
    return error;
}

/*
 * post_op_fh3
 *
 *  union post_op_fh3 switch (bool handle_follows) {
 *  case TRUE:
 *      nfs_fh3  handle;
 *  case FALSE:
 *      void;
 *  };
 */
static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
    __be32 *p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    if (*p != xdr_zero)
        return decode_nfs_fh3(xdr, fh);
    zero_nfs_fh3(fh);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * diropargs3
 *
 *  struct diropargs3 {
 *      nfs_fh3     dir;
 *      filename3   name;
 *  };
 */
static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
                  const char *name, u32 length)
{
    encode_nfs_fh3(xdr, fh);
    encode_filename3(xdr, name, length);
}


/*
 * NFSv3 XDR encode functions
 *
 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
 */

/*
 * 3.3.1  GETATTR3args
 *
 *  struct GETATTR3args {
 *      nfs_fh3  object;
 *  };
 */
static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
                      struct xdr_stream *xdr,
                      const struct nfs_fh *fh)
{
    encode_nfs_fh3(xdr, fh);
}

/*
 * 3.3.2  SETATTR3args
 *
 *  union sattrguard3 switch (bool check) {
 *  case TRUE:
 *      nfstime3  obj_ctime;
 *  case FALSE:
 *      void;
 *  };
 *
 *  struct SETATTR3args {
 *      nfs_fh3     object;
 *      sattr3      new_attributes;
 *      sattrguard3 guard;
 *  };
 */
static void encode_sattrguard3(struct xdr_stream *xdr,
                   const struct nfs3_sattrargs *args)
{
    __be32 *p;

    if (args->guard) {
        p = xdr_reserve_space(xdr, 4 + 8);
        *p++ = xdr_one;
        xdr_encode_nfstime3(p, &args->guardtime);
    } else {
        p = xdr_reserve_space(xdr, 4);
        *p = xdr_zero;
    }
}

static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
                      struct xdr_stream *xdr,
                      const struct nfs3_sattrargs *args)
{
    encode_nfs_fh3(xdr, args->fh);
    encode_sattr3(xdr, args->sattr);
    encode_sattrguard3(xdr, args);
}

/*
 * 3.3.3  LOOKUP3args
 *
 *  struct LOOKUP3args {
 *      diropargs3  what;
 *  };
 */
static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs3_diropargs *args)
{
    encode_diropargs3(xdr, args->fh, args->name, args->len);
}

/*
 * 3.3.4  ACCESS3args
 *
 *  struct ACCESS3args {
 *      nfs_fh3     object;
 *      uint32      access;
 *  };
 */
static void encode_access3args(struct xdr_stream *xdr,
                   const struct nfs3_accessargs *args)
{
    encode_nfs_fh3(xdr, args->fh);
    encode_uint32(xdr, args->access);
}

static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs3_accessargs *args)
{
    encode_access3args(xdr, args);
}

/*
 * 3.3.5  READLINK3args
 *
 *  struct READLINK3args {
 *      nfs_fh3 symlink;
 *  };
 */
static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
                       struct xdr_stream *xdr,
                       const struct nfs3_readlinkargs *args)
{
    encode_nfs_fh3(xdr, args->fh);
    prepare_reply_buffer(req, args->pages, args->pgbase,
                    args->pglen, NFS3_readlinkres_sz);
}

/*
 * 3.3.6  READ3args
 *
 *  struct READ3args {
 *      nfs_fh3     file;
 *      offset3     offset;
 *      count3      count;
 *  };
 */
static void encode_read3args(struct xdr_stream *xdr,
                 const struct nfs_readargs *args)
{
    __be32 *p;

    encode_nfs_fh3(xdr, args->fh);

    p = xdr_reserve_space(xdr, 8 + 4);
    p = xdr_encode_hyper(p, args->offset);
    *p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   const struct nfs_readargs *args)
{
    encode_read3args(xdr, args);
    prepare_reply_buffer(req, args->pages, args->pgbase,
                    args->count, NFS3_readres_sz);
    req->rq_rcv_buf.flags |= XDRBUF_READ;
}

/*
 * 3.3.7  WRITE3args
 *
 *  enum stable_how {
 *      UNSTABLE  = 0,
 *      DATA_SYNC = 1,
 *      FILE_SYNC = 2
 *  };
 *
 *  struct WRITE3args {
 *      nfs_fh3     file;
 *      offset3     offset;
 *      count3      count;
 *      stable_how  stable;
 *      opaque      data<>;
 *  };
 */
static void encode_write3args(struct xdr_stream *xdr,
                  const struct nfs_writeargs *args)
{
    __be32 *p;

    encode_nfs_fh3(xdr, args->fh);

    p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
    p = xdr_encode_hyper(p, args->offset);
    *p++ = cpu_to_be32(args->count);
    *p++ = cpu_to_be32(args->stable);
    *p = cpu_to_be32(args->count);
    xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
}

static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    const struct nfs_writeargs *args)
{
    encode_write3args(xdr, args);
    xdr->buf->flags |= XDRBUF_WRITE;
}

/*
 * 3.3.8  CREATE3args
 *
 *  enum createmode3 {
 *      UNCHECKED = 0,
 *      GUARDED   = 1,
 *      EXCLUSIVE = 2
 *  };
 *
 *  union createhow3 switch (createmode3 mode) {
 *  case UNCHECKED:
 *  case GUARDED:
 *      sattr3       obj_attributes;
 *  case EXCLUSIVE:
 *      createverf3  verf;
 *  };
 *
 *  struct CREATE3args {
 *      diropargs3  where;
 *      createhow3  how;
 *  };
 */
static void encode_createhow3(struct xdr_stream *xdr,
                  const struct nfs3_createargs *args)
{
    encode_uint32(xdr, args->createmode);
    switch (args->createmode) {
    case NFS3_CREATE_UNCHECKED:
    case NFS3_CREATE_GUARDED:
        encode_sattr3(xdr, args->sattr);
        break;
    case NFS3_CREATE_EXCLUSIVE:
        encode_createverf3(xdr, args->verifier);
        break;
    default:
        BUG();
    }
}

static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs3_createargs *args)
{
    encode_diropargs3(xdr, args->fh, args->name, args->len);
    encode_createhow3(xdr, args);
}

/*
 * 3.3.9  MKDIR3args
 *
 *  struct MKDIR3args {
 *      diropargs3  where;
 *      sattr3      attributes;
 *  };
 */
static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    const struct nfs3_mkdirargs *args)
{
    encode_diropargs3(xdr, args->fh, args->name, args->len);
    encode_sattr3(xdr, args->sattr);
}

/*
 * 3.3.10  SYMLINK3args
 *
 *  struct symlinkdata3 {
 *      sattr3      symlink_attributes;
 *      nfspath3    symlink_data;
 *  };
 *
 *  struct SYMLINK3args {
 *      diropargs3  where;
 *      symlinkdata3    symlink;
 *  };
 */
static void encode_symlinkdata3(struct xdr_stream *xdr,
                const struct nfs3_symlinkargs *args)
{
    encode_sattr3(xdr, args->sattr);
    encode_nfspath3(xdr, args->pages, args->pathlen);
}

static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
                      struct xdr_stream *xdr,
                      const struct nfs3_symlinkargs *args)
{
    encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
    encode_symlinkdata3(xdr, args);
}

/*
 * 3.3.11  MKNOD3args
 *
 *  struct devicedata3 {
 *      sattr3      dev_attributes;
 *      specdata3   spec;
 *  };
 *
 *  union mknoddata3 switch (ftype3 type) {
 *  case NF3CHR:
 *  case NF3BLK:
 *      devicedata3 device;
 *  case NF3SOCK:
 *  case NF3FIFO:
 *      sattr3      pipe_attributes;
 *  default:
 *      void;
 *  };
 *
 *  struct MKNOD3args {
 *      diropargs3  where;
 *      mknoddata3  what;
 *  };
 */
static void encode_devicedata3(struct xdr_stream *xdr,
                   const struct nfs3_mknodargs *args)
{
    encode_sattr3(xdr, args->sattr);
    encode_specdata3(xdr, args->rdev);
}

static void encode_mknoddata3(struct xdr_stream *xdr,
                  const struct nfs3_mknodargs *args)
{
    encode_ftype3(xdr, args->type);
    switch (args->type) {
    case NF3CHR:
    case NF3BLK:
        encode_devicedata3(xdr, args);
        break;
    case NF3SOCK:
    case NF3FIFO:
        encode_sattr3(xdr, args->sattr);
        break;
    case NF3REG:
    case NF3DIR:
        break;
    default:
        BUG();
    }
}

static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    const struct nfs3_mknodargs *args)
{
    encode_diropargs3(xdr, args->fh, args->name, args->len);
    encode_mknoddata3(xdr, args);
}

/*
 * 3.3.12  REMOVE3args
 *
 *  struct REMOVE3args {
 *      diropargs3  object;
 *  };
 */
static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs_removeargs *args)
{
    encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
}

/*
 * 3.3.14  RENAME3args
 *
 *  struct RENAME3args {
 *      diropargs3  from;
 *      diropargs3  to;
 *  };
 */
static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs_renameargs *args)
{
    const struct qstr *old = args->old_name;
    const struct qstr *new = args->new_name;

    encode_diropargs3(xdr, args->old_dir, old->name, old->len);
    encode_diropargs3(xdr, args->new_dir, new->name, new->len);
}

/*
 * 3.3.15  LINK3args
 *
 *  struct LINK3args {
 *      nfs_fh3     file;
 *      diropargs3  link;
 *  };
 */
static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   const struct nfs3_linkargs *args)
{
    encode_nfs_fh3(xdr, args->fromfh);
    encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
}

/*
 * 3.3.16  READDIR3args
 *
 *  struct READDIR3args {
 *      nfs_fh3     dir;
 *      cookie3     cookie;
 *      cookieverf3 cookieverf;
 *      count3      count;
 *  };
 */
static void encode_readdir3args(struct xdr_stream *xdr,
                const struct nfs3_readdirargs *args)
{
    __be32 *p;

    encode_nfs_fh3(xdr, args->fh);

    p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
    p = xdr_encode_cookie3(p, args->cookie);
    p = xdr_encode_cookieverf3(p, args->verf);
    *p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
                      struct xdr_stream *xdr,
                      const struct nfs3_readdirargs *args)
{
    encode_readdir3args(xdr, args);
    prepare_reply_buffer(req, args->pages, 0,
                args->count, NFS3_readdirres_sz);
}

/*
 * 3.3.17  READDIRPLUS3args
 *
 *  struct READDIRPLUS3args {
 *      nfs_fh3     dir;
 *      cookie3     cookie;
 *      cookieverf3 cookieverf;
 *      count3      dircount;
 *      count3      maxcount;
 *  };
 */
static void encode_readdirplus3args(struct xdr_stream *xdr,
                    const struct nfs3_readdirargs *args)
{
    __be32 *p;

    encode_nfs_fh3(xdr, args->fh);

    p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
    p = xdr_encode_cookie3(p, args->cookie);
    p = xdr_encode_cookieverf3(p, args->verf);

    /*
     * readdirplus: need dircount + buffer size.
     * We just make sure we make dircount big enough
     */
    *p++ = cpu_to_be32(args->count >> 3);

    *p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
                      struct xdr_stream *xdr,
                      const struct nfs3_readdirargs *args)
{
    encode_readdirplus3args(xdr, args);
    prepare_reply_buffer(req, args->pages, 0,
                args->count, NFS3_readdirres_sz);
}

/*
 * 3.3.21  COMMIT3args
 *
 *  struct COMMIT3args {
 *      nfs_fh3     file;
 *      offset3     offset;
 *      count3      count;
 *  };
 */
static void encode_commit3args(struct xdr_stream *xdr,
                   const struct nfs_commitargs *args)
{
    __be32 *p;

    encode_nfs_fh3(xdr, args->fh);

    p = xdr_reserve_space(xdr, 8 + 4);
    p = xdr_encode_hyper(p, args->offset);
    *p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs_commitargs *args)
{
    encode_commit3args(xdr, args);
}

#ifdef CONFIG_NFS_V3_ACL

static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs3_getaclargs *args)
{
    encode_nfs_fh3(xdr, args->fh);
    encode_uint32(xdr, args->mask);
    if (args->mask & (NFS_ACL | NFS_DFACL))
        prepare_reply_buffer(req, args->pages, 0,
                    NFSACL_MAXPAGES << PAGE_SHIFT,
                    ACL3_getaclres_sz);
}

static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     const struct nfs3_setaclargs *args)
{
    unsigned int base;
    int error;

    encode_nfs_fh3(xdr, NFS_FH(args->inode));
    encode_uint32(xdr, args->mask);

    base = req->rq_slen;
    if (args->npages != 0)
        xdr_write_pages(xdr, args->pages, 0, args->len);
    else
        xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);

    error = nfsacl_encode(xdr->buf, base, args->inode,
                (args->mask & NFS_ACL) ?
                args->acl_access : NULL, 1, 0);
    BUG_ON(error < 0);
    error = nfsacl_encode(xdr->buf, base + error, args->inode,
                (args->mask & NFS_DFACL) ?
                args->acl_default : NULL, 1,
                NFS_ACL_DEFAULT);
    BUG_ON(error < 0);
}

#endif  /* CONFIG_NFS_V3_ACL */

/*
 * NFSv3 XDR decode functions
 *
 * NFSv3 result types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
 */

/*
 * 3.3.1  GETATTR3res
 *
 *  struct GETATTR3resok {
 *      fattr3      obj_attributes;
 *  };
 *
 *  union GETATTR3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      GETATTR3resok  resok;
 *  default:
 *      void;
 *  };
 */
static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    struct nfs_fattr *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_fattr3(xdr, result);
out:
    return error;
out_default:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.2  SETATTR3res
 *
 *  struct SETATTR3resok {
 *      wcc_data  obj_wcc;
 *  };
 *
 *  struct SETATTR3resfail {
 *      wcc_data  obj_wcc;
 *  };
 *
 *  union SETATTR3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      SETATTR3resok   resok;
 *  default:
 *      SETATTR3resfail resfail;
 *  };
 */
static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    struct nfs_fattr *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_wcc_data(xdr, result);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.3  LOOKUP3res
 *
 *  struct LOOKUP3resok {
 *      nfs_fh3     object;
 *      post_op_attr    obj_attributes;
 *      post_op_attr    dir_attributes;
 *  };
 *
 *  struct LOOKUP3resfail {
 *      post_op_attr    dir_attributes;
 *  };
 *
 *  union LOOKUP3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      LOOKUP3resok    resok;
 *  default:
 *      LOOKUP3resfail  resfail;
 *  };
 */
static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs3_diropres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_nfs_fh3(xdr, result->fh);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->dir_attr);
out:
    return error;
out_default:
    error = decode_post_op_attr(xdr, result->dir_attr);
    if (unlikely(error))
        goto out;
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.4  ACCESS3res
 *
 *  struct ACCESS3resok {
 *      post_op_attr    obj_attributes;
 *      uint32      access;
 *  };
 *
 *  struct ACCESS3resfail {
 *      post_op_attr    obj_attributes;
 *  };
 *
 *  union ACCESS3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      ACCESS3resok    resok;
 *  default:
 *      ACCESS3resfail  resfail;
 *  };
 */
static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs3_accessres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_uint32(xdr, &result->access);
out:
    return error;
out_default:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.5  READLINK3res
 *
 *  struct READLINK3resok {
 *      post_op_attr    symlink_attributes;
 *      nfspath3    data;
 *  };
 *
 *  struct READLINK3resfail {
 *      post_op_attr    symlink_attributes;
 *  };
 *
 *  union READLINK3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      READLINK3resok  resok;
 *  default:
 *      READLINK3resfail resfail;
 *  };
 */
static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     struct nfs_fattr *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_nfspath3(xdr);
out:
    return error;
out_default:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.6  READ3res
 *
 *  struct READ3resok {
 *      post_op_attr    file_attributes;
 *      count3      count;
 *      bool        eof;
 *      opaque      data<>;
 *  };
 *
 *  struct READ3resfail {
 *      post_op_attr    file_attributes;
 *  };
 *
 *  union READ3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      READ3resok  resok;
 *  default:
 *      READ3resfail    resfail;
 *  };
 */
static int decode_read3resok(struct xdr_stream *xdr,
                 struct nfs_readres *result)
{
    u32 eof, count, ocount, recvd;
    __be32 *p;

    p = xdr_inline_decode(xdr, 4 + 4 + 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    count = be32_to_cpup(p++);
    eof = be32_to_cpup(p++);
    ocount = be32_to_cpup(p++);
    if (unlikely(ocount != count))
        goto out_mismatch;
    recvd = xdr_read_pages(xdr, count);
    if (unlikely(count > recvd))
        goto out_cheating;
out:
    result->eof = eof;
    result->count = count;
    return count;
out_mismatch:
    dprintk("NFS: READ count doesn't match length of opaque: "
        "count %u != ocount %u\n", count, ocount);
    return -EIO;
out_cheating:
    dprintk("NFS: server cheating in read result: "
        "count %u > recvd %u\n", count, recvd);
    count = recvd;
    eof = 0;
    goto out;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
                 struct nfs_readres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
    error = decode_read3resok(xdr, result);
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.7  WRITE3res
 *
 *  enum stable_how {
 *      UNSTABLE  = 0,
 *      DATA_SYNC = 1,
 *      FILE_SYNC = 2
 *  };
 *
 *  struct WRITE3resok {
 *      wcc_data    file_wcc;
 *      count3      count;
 *      stable_how  committed;
 *      writeverf3  verf;
 *  };
 *
 *  struct WRITE3resfail {
 *      wcc_data    file_wcc;
 *  };
 *
 *  union WRITE3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      WRITE3resok resok;
 *  default:
 *      WRITE3resfail   resfail;
 *  };
 */
static int decode_write3resok(struct xdr_stream *xdr,
                  struct nfs_writeres *result)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4 + 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    result->count = be32_to_cpup(p++);
    result->verf->committed = be32_to_cpup(p++);
    if (unlikely(result->verf->committed > NFS_FILE_SYNC))
        goto out_badvalue;
    if (decode_writeverf3(xdr, &result->verf->verifier))
        goto out_eio;
    return result->count;
out_badvalue:
    dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
    return -EIO;
out_overflow:
    print_overflow_msg(__func__, xdr);
out_eio:
    return -EIO;
}

static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
                  struct nfs_writeres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_wcc_data(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
    error = decode_write3resok(xdr, result);
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.8  CREATE3res
 *
 *  struct CREATE3resok {
 *      post_op_fh3 obj;
 *      post_op_attr    obj_attributes;
 *      wcc_data    dir_wcc;
 *  };
 *
 *  struct CREATE3resfail {
 *      wcc_data    dir_wcc;
 *  };
 *
 *  union CREATE3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      CREATE3resok    resok;
 *  default:
 *      CREATE3resfail  resfail;
 *  };
 */
static int decode_create3resok(struct xdr_stream *xdr,
                   struct nfs3_diropres *result)
{
    int error;

    error = decode_post_op_fh3(xdr, result->fh);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    /* The server isn't required to return a file handle.
     * If it didn't, force the client to perform a LOOKUP
     * to determine the correct file handle and attribute
     * values for the new object. */
    if (result->fh->size == 0)
        result->fattr->valid = 0;
    error = decode_wcc_data(xdr, result->dir_attr);
out:
    return error;
}

static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs3_diropres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_create3resok(xdr, result);
out:
    return error;
out_default:
    error = decode_wcc_data(xdr, result->dir_attr);
    if (unlikely(error))
        goto out;
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.12  REMOVE3res
 *
 *  struct REMOVE3resok {
 *      wcc_data    dir_wcc;
 *  };
 *
 *  struct REMOVE3resfail {
 *      wcc_data    dir_wcc;
 *  };
 *
 *  union REMOVE3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      REMOVE3resok   resok;
 *  default:
 *      REMOVE3resfail resfail;
 *  };
 */
static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs_removeres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_wcc_data(xdr, result->dir_attr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.14  RENAME3res
 *
 *  struct RENAME3resok {
 *      wcc_data    fromdir_wcc;
 *      wcc_data    todir_wcc;
 *  };
 *
 *  struct RENAME3resfail {
 *      wcc_data    fromdir_wcc;
 *      wcc_data    todir_wcc;
 *  };
 *
 *  union RENAME3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      RENAME3resok   resok;
 *  default:
 *      RENAME3resfail resfail;
 *  };
 */
static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs_renameres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_wcc_data(xdr, result->old_fattr);
    if (unlikely(error))
        goto out;
    error = decode_wcc_data(xdr, result->new_fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.15  LINK3res
 *
 *  struct LINK3resok {
 *      post_op_attr    file_attributes;
 *      wcc_data    linkdir_wcc;
 *  };
 *
 *  struct LINK3resfail {
 *      post_op_attr    file_attributes;
 *      wcc_data    linkdir_wcc;
 *  };
 *
 *  union LINK3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      LINK3resok  resok;
 *  default:
 *      LINK3resfail    resfail;
 *  };
 */
static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
                 struct nfs3_linkres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    error = decode_wcc_data(xdr, result->dir_attr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
               int plus)
{
    struct nfs_entry old = *entry;
    __be32 *p;
    int error;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    if (*p == xdr_zero) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(p == NULL))
            goto out_overflow;
        if (*p == xdr_zero)
            return -EAGAIN;
        entry->eof = 1;
        return -EBADCOOKIE;
    }

    error = decode_fileid3(xdr, &entry->ino);
    if (unlikely(error))
        return error;

    error = decode_inline_filename3(xdr, &entry->name, &entry->len);
    if (unlikely(error))
        return error;

    entry->prev_cookie = entry->cookie;
    error = decode_cookie3(xdr, &entry->cookie);
    if (unlikely(error))
        return error;

    entry->d_type = DT_UNKNOWN;

    if (plus) {
        entry->fattr->valid = 0;
        error = decode_post_op_attr(xdr, entry->fattr);
        if (unlikely(error))
            return error;
        if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
            entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);

        /* In fact, a post_op_fh3: */
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(p == NULL))
            goto out_overflow;
        if (*p != xdr_zero) {
            error = decode_nfs_fh3(xdr, entry->fh);
            if (unlikely(error)) {
                if (error == -E2BIG)
                    goto out_truncated;
                return error;
            }
        } else
            zero_nfs_fh3(entry->fh);
    }

    return 0;

out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EAGAIN;
out_truncated:
    dprintk("NFS: directory entry contains invalid file handle\n");
    *entry = old;
    return -EAGAIN;
}

/*
 * 3.3.16  READDIR3res
 *
 *  struct dirlist3 {
 *      entry3      *entries;
 *      bool        eof;
 *  };
 *
 *  struct READDIR3resok {
 *      post_op_attr    dir_attributes;
 *      cookieverf3 cookieverf;
 *      dirlist3    reply;
 *  };
 *
 *  struct READDIR3resfail {
 *      post_op_attr    dir_attributes;
 *  };
 *
 *  union READDIR3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      READDIR3resok   resok;
 *  default:
 *      READDIR3resfail resfail;
 *  };
 *
 * Read the directory contents into the page cache, but otherwise
 * don't touch them.  The actual decoding is done by nfs3_decode_entry()
 * during subsequent nfs_readdir() calls.
 */
static int decode_dirlist3(struct xdr_stream *xdr)
{
    return xdr_read_pages(xdr, xdr->buf->page_len);
}

static int decode_readdir3resok(struct xdr_stream *xdr,
                struct nfs3_readdirres *result)
{
    int error;

    error = decode_post_op_attr(xdr, result->dir_attr);
    if (unlikely(error))
        goto out;
    /* XXX: do we need to check if result->verf != NULL ? */
    error = decode_cookieverf3(xdr, result->verf);
    if (unlikely(error))
        goto out;
    error = decode_dirlist3(xdr);
out:
    return error;
}

static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    struct nfs3_readdirres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_readdir3resok(xdr, result);
out:
    return error;
out_default:
    error = decode_post_op_attr(xdr, result->dir_attr);
    if (unlikely(error))
        goto out;
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.18  FSSTAT3res
 *
 *  struct FSSTAT3resok {
 *      post_op_attr    obj_attributes;
 *      size3       tbytes;
 *      size3       fbytes;
 *      size3       abytes;
 *      size3       tfiles;
 *      size3       ffiles;
 *      size3       afiles;
 *      uint32      invarsec;
 *  };
 *
 *  struct FSSTAT3resfail {
 *      post_op_attr    obj_attributes;
 *  };
 *
 *  union FSSTAT3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      FSSTAT3resok    resok;
 *  default:
 *      FSSTAT3resfail  resfail;
 *  };
 */
static int decode_fsstat3resok(struct xdr_stream *xdr,
                   struct nfs_fsstat *result)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 8 * 6 + 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    p = xdr_decode_size3(p, &result->tbytes);
    p = xdr_decode_size3(p, &result->fbytes);
    p = xdr_decode_size3(p, &result->abytes);
    p = xdr_decode_size3(p, &result->tfiles);
    p = xdr_decode_size3(p, &result->ffiles);
    xdr_decode_size3(p, &result->afiles);
    /* ignore invarsec */
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs_fsstat *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
    error = decode_fsstat3resok(xdr, result);
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.19  FSINFO3res
 *
 *  struct FSINFO3resok {
 *      post_op_attr    obj_attributes;
 *      uint32      rtmax;
 *      uint32      rtpref;
 *      uint32      rtmult;
 *      uint32      wtmax;
 *      uint32      wtpref;
 *      uint32      wtmult;
 *      uint32      dtpref;
 *      size3       maxfilesize;
 *      nfstime3    time_delta;
 *      uint32      properties;
 *  };
 *
 *  struct FSINFO3resfail {
 *      post_op_attr    obj_attributes;
 *  };
 *
 *  union FSINFO3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      FSINFO3resok    resok;
 *  default:
 *      FSINFO3resfail  resfail;
 *  };
 */
static int decode_fsinfo3resok(struct xdr_stream *xdr,
                   struct nfs_fsinfo *result)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
    if (unlikely(p == NULL))
        goto out_overflow;
    result->rtmax  = be32_to_cpup(p++);
    result->rtpref = be32_to_cpup(p++);
    result->rtmult = be32_to_cpup(p++);
    result->wtmax  = be32_to_cpup(p++);
    result->wtpref = be32_to_cpup(p++);
    result->wtmult = be32_to_cpup(p++);
    result->dtpref = be32_to_cpup(p++);
    p = xdr_decode_size3(p, &result->maxfilesize);
    xdr_decode_nfstime3(p, &result->time_delta);

    /* ignore properties */
    result->lease_time = 0;
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs_fsinfo *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
    error = decode_fsinfo3resok(xdr, result);
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.20  PATHCONF3res
 *
 *  struct PATHCONF3resok {
 *      post_op_attr    obj_attributes;
 *      uint32      linkmax;
 *      uint32      name_max;
 *      bool        no_trunc;
 *      bool        chown_restricted;
 *      bool        case_insensitive;
 *      bool        case_preserving;
 *  };
 *
 *  struct PATHCONF3resfail {
 *      post_op_attr    obj_attributes;
 *  };
 *
 *  union PATHCONF3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      PATHCONF3resok  resok;
 *  default:
 *      PATHCONF3resfail resfail;
 *  };
 */
static int decode_pathconf3resok(struct xdr_stream *xdr,
                 struct nfs_pathconf *result)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4 * 6);
    if (unlikely(p == NULL))
        goto out_overflow;
    result->max_link = be32_to_cpup(p++);
    result->max_namelen = be32_to_cpup(p);
    /* ignore remaining fields */
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     struct nfs_pathconf *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
    error = decode_pathconf3resok(xdr, result);
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

/*
 * 3.3.21  COMMIT3res
 *
 *  struct COMMIT3resok {
 *      wcc_data    file_wcc;
 *      writeverf3  verf;
 *  };
 *
 *  struct COMMIT3resfail {
 *      wcc_data    file_wcc;
 *  };
 *
 *  union COMMIT3res switch (nfsstat3 status) {
 *  case NFS3_OK:
 *      COMMIT3resok    resok;
 *  default:
 *      COMMIT3resfail  resfail;
 *  };
 */
static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs_commitres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    error = decode_wcc_data(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_status;
    error = decode_writeverf3(xdr, &result->verf->verifier);
out:
    return error;
out_status:
    return nfs3_stat_to_errno(status);
}

#ifdef CONFIG_NFS_V3_ACL

static inline int decode_getacl3resok(struct xdr_stream *xdr,
                      struct nfs3_getaclres *result)
{
    struct posix_acl **acl;
    unsigned int *aclcnt;
    size_t hdrlen;
    int error;

    error = decode_post_op_attr(xdr, result->fattr);
    if (unlikely(error))
        goto out;
    error = decode_uint32(xdr, &result->mask);
    if (unlikely(error))
        goto out;
    error = -EINVAL;
    if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
        goto out;

    hdrlen = xdr_stream_pos(xdr);

    acl = NULL;
    if (result->mask & NFS_ACL)
        acl = &result->acl_access;
    aclcnt = NULL;
    if (result->mask & NFS_ACLCNT)
        aclcnt = &result->acl_access_count;
    error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
    if (unlikely(error <= 0))
        goto out;

    acl = NULL;
    if (result->mask & NFS_DFACL)
        acl = &result->acl_default;
    aclcnt = NULL;
    if (result->mask & NFS_DFACLCNT)
        aclcnt = &result->acl_default_count;
    error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
    if (unlikely(error <= 0))
        return error;
    error = 0;
out:
    return error;
}

static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs3_getaclres *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_getacl3resok(xdr, result);
out:
    return error;
out_default:
    return nfs3_stat_to_errno(status);
}

static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
                   struct xdr_stream *xdr,
                   struct nfs_fattr *result)
{
    enum nfs_stat status;
    int error;

    error = decode_nfsstat3(xdr, &status);
    if (unlikely(error))
        goto out;
    if (status != NFS3_OK)
        goto out_default;
    error = decode_post_op_attr(xdr, result);
out:
    return error;
out_default:
    return nfs3_stat_to_errno(status);
}

#endif  /* CONFIG_NFS_V3_ACL */


/*
 * We need to translate between nfs status return values and
 * the local errno values which may not be the same.
 */
static const struct {
    int stat;
    int errno;
} nfs_errtbl[] = {
    { NFS_OK,       0       },
    { NFSERR_PERM,      -EPERM      },
    { NFSERR_NOENT,     -ENOENT     },
    { NFSERR_IO,        -errno_NFSERR_IO},
    { NFSERR_NXIO,      -ENXIO      },
/*  { NFSERR_EAGAIN,    -EAGAIN     }, */
    { NFSERR_ACCES,     -EACCES     },
    { NFSERR_EXIST,     -EEXIST     },
    { NFSERR_XDEV,      -EXDEV      },
    { NFSERR_NODEV,     -ENODEV     },
    { NFSERR_NOTDIR,    -ENOTDIR    },
    { NFSERR_ISDIR,     -EISDIR     },
    { NFSERR_INVAL,     -EINVAL     },
    { NFSERR_FBIG,      -EFBIG      },
    { NFSERR_NOSPC,     -ENOSPC     },
    { NFSERR_ROFS,      -EROFS      },
    { NFSERR_MLINK,     -EMLINK     },
    { NFSERR_NAMETOOLONG,   -ENAMETOOLONG   },
    { NFSERR_NOTEMPTY,  -ENOTEMPTY  },
    { NFSERR_DQUOT,     -EDQUOT     },
    { NFSERR_STALE,     -ESTALE     },
    { NFSERR_REMOTE,    -EREMOTE    },
#ifdef EWFLUSH
    { NFSERR_WFLUSH,    -EWFLUSH    },
#endif
    { NFSERR_BADHANDLE, -EBADHANDLE },
    { NFSERR_NOT_SYNC,  -ENOTSYNC   },
    { NFSERR_BAD_COOKIE,    -EBADCOOKIE },
    { NFSERR_NOTSUPP,   -ENOTSUPP   },
    { NFSERR_TOOSMALL,  -ETOOSMALL  },
    { NFSERR_SERVERFAULT,   -EREMOTEIO  },
    { NFSERR_BADTYPE,   -EBADTYPE   },
    { NFSERR_JUKEBOX,   -EJUKEBOX   },
    { -1,           -EIO        }
};

static int nfs3_stat_to_errno(enum nfs_stat status)
{
    int i;

    for (i = 0; nfs_errtbl[i].stat != -1; i++) {
        if (nfs_errtbl[i].stat == (int)status)
            return nfs_errtbl[i].errno;
    }
    dprintk("NFS: Unrecognized nfs status value: %u\n", status);
    return nfs_errtbl[i].errno;
}


#define PROC(proc, argtype, restype, timer)             \
[NFS3PROC_##proc] = {                           \
    .p_proc      = NFS3PROC_##proc,                 \
    .p_encode    = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args,  \
    .p_decode    = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res,   \
    .p_arglen    = NFS3_##argtype##args_sz,             \
    .p_replen    = NFS3_##restype##res_sz,              \
    .p_timer     = timer,                       \
    .p_statidx   = NFS3PROC_##proc,                 \
    .p_name      = #proc,                       \
    }

struct rpc_procinfo nfs3_procedures[] = {
    PROC(GETATTR,       getattr,    getattr,    1),
    PROC(SETATTR,       setattr,    setattr,    0),
    PROC(LOOKUP,        lookup,     lookup,     2),
    PROC(ACCESS,        access,     access,     1),
    PROC(READLINK,      readlink,   readlink,   3),
    PROC(READ,      read,       read,       3),
    PROC(WRITE,     write,      write,      4),
    PROC(CREATE,        create,     create,     0),
    PROC(MKDIR,     mkdir,      create,     0),
    PROC(SYMLINK,       symlink,    create,     0),
    PROC(MKNOD,     mknod,      create,     0),
    PROC(REMOVE,        remove,     remove,     0),
    PROC(RMDIR,     lookup,     setattr,    0),
    PROC(RENAME,        rename,     rename,     0),
    PROC(LINK,      link,       link,       0),
    PROC(READDIR,       readdir,    readdir,    3),
    PROC(READDIRPLUS,   readdirplus,    readdir,    3),
    PROC(FSSTAT,        getattr,    fsstat,     0),
    PROC(FSINFO,        getattr,    fsinfo,     0),
    PROC(PATHCONF,      getattr,    pathconf,   0),
    PROC(COMMIT,        commit,     commit,     5),
};

const struct rpc_version nfs_version3 = {
    .number         = 3,
    .nrprocs        = ARRAY_SIZE(nfs3_procedures),
    .procs          = nfs3_procedures
};

#ifdef CONFIG_NFS_V3_ACL
static struct rpc_procinfo  nfs3_acl_procedures[] = {
    [ACLPROC3_GETACL] = {
        .p_proc = ACLPROC3_GETACL,
        .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
        .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
        .p_arglen = ACL3_getaclargs_sz,
        .p_replen = ACL3_getaclres_sz,
        .p_timer = 1,
        .p_name = "GETACL",
    },
    [ACLPROC3_SETACL] = {
        .p_proc = ACLPROC3_SETACL,
        .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
        .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
        .p_arglen = ACL3_setaclargs_sz,
        .p_replen = ACL3_setaclres_sz,
        .p_timer = 0,
        .p_name = "SETACL",
    },
};

const struct rpc_version nfsacl_version3 = {
    .number         = 3,
    .nrprocs        = sizeof(nfs3_acl_procedures)/
                  sizeof(nfs3_acl_procedures[0]),
    .procs          = nfs3_acl_procedures,
};
#endif  /* CONFIG_NFS_V3_ACL */