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[linux-2.6/mini2440.git] / fs / nfs / nfs2xdr.c

/*
 * linux/fs/nfs/nfs2xdr.c
 *
 * XDR functions to encode/decode NFS RPC arguments and results.
 *
 * Copyright (C) 1992, 1993, 1994  Rick Sladkey
 * Copyright (C) 1996 Olaf Kirch
 * 04 Aug 1998  Ion Badulescu <ionut@cs.columbia.edu>
 *              FIFO's need special handling in NFSv2
 */

#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/utsname.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_fs.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 NFS_fhandle_sz          (8)
#define NFS_sattr_sz            (8)
#define NFS_filename_sz         (1+(NFS2_MAXNAMLEN>>2))
#define NFS_path_sz             (1+(NFS2_MAXPATHLEN>>2))
#define NFS_fattr_sz            (17)
#define NFS_info_sz             (5)
#define NFS_entry_sz            (NFS_filename_sz+3)

#define NFS_diropargs_sz        (NFS_fhandle_sz+NFS_filename_sz)
#define NFS_removeargs_sz       (NFS_fhandle_sz+NFS_filename_sz)
#define NFS_sattrargs_sz        (NFS_fhandle_sz+NFS_sattr_sz)
#define NFS_readlinkargs_sz     (NFS_fhandle_sz)
#define NFS_readargs_sz         (NFS_fhandle_sz+3)
#define NFS_writeargs_sz        (NFS_fhandle_sz+4)
#define NFS_createargs_sz       (NFS_diropargs_sz+NFS_sattr_sz)
#define NFS_renameargs_sz       (NFS_diropargs_sz+NFS_diropargs_sz)
#define NFS_linkargs_sz         (NFS_fhandle_sz+NFS_diropargs_sz)
#define NFS_symlinkargs_sz      (NFS_diropargs_sz+1+NFS_sattr_sz)
#define NFS_readdirargs_sz      (NFS_fhandle_sz+2)

#define NFS_attrstat_sz         (1+NFS_fattr_sz)
#define NFS_diropres_sz         (1+NFS_fhandle_sz+NFS_fattr_sz)
#define NFS_readlinkres_sz      (2)
#define NFS_readres_sz          (1+NFS_fattr_sz+1)
#define NFS_writeres_sz         (NFS_attrstat_sz)
#define NFS_stat_sz             (1)
#define NFS_readdirres_sz       (1)
#define NFS_statfsres_sz        (1+NFS_info_sz)

/*
 * Common NFS XDR functions as inlines
 */
static inline __be32 *
xdr_encode_fhandle(__be32 *p, const struct nfs_fh *fhandle)
{
        memcpy(p, fhandle->data, NFS2_FHSIZE);
        return p + XDR_QUADLEN(NFS2_FHSIZE);
}

static inline __be32 *
xdr_decode_fhandle(__be32 *p, struct nfs_fh *fhandle)
{
        /* NFSv2 handles have a fixed length */
        fhandle->size = NFS2_FHSIZE;
        memcpy(fhandle->data, p, NFS2_FHSIZE);
        return p + XDR_QUADLEN(NFS2_FHSIZE);
}

static inline __be32*
xdr_encode_time(__be32 *p, struct timespec *timep)
{
        *p++ = htonl(timep->tv_sec);
        /* Convert nanoseconds into microseconds */
        *p++ = htonl(timep->tv_nsec ? timep->tv_nsec / 1000 : 0);
        return p;
}

static inline __be32*
xdr_encode_current_server_time(__be32 *p, struct timespec *timep)
{
        /*
         * Passing the invalid value useconds=1000000 is a
         * Sun convention for "set to current server time".
         * It's needed to make permissions checks for the
         * "touch" program across v2 mounts to Solaris and
         * Irix boxes work correctly. See description of
         * sattr in section 6.1 of "NFS Illustrated" by
         * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
         */
        *p++ = htonl(timep->tv_sec);
        *p++ = htonl(1000000);
        return p;
}

static inline __be32*
xdr_decode_time(__be32 *p, struct timespec *timep)
{
        timep->tv_sec = ntohl(*p++);
        /* Convert microseconds into nanoseconds */
        timep->tv_nsec = ntohl(*p++) * 1000;
        return p;
}

static __be32 *
xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
{
        u32 rdev;
        fattr->type = (enum nfs_ftype) ntohl(*p++);
        fattr->mode = ntohl(*p++);
        fattr->nlink = ntohl(*p++);
        fattr->uid = ntohl(*p++);
        fattr->gid = ntohl(*p++);
        fattr->size = ntohl(*p++);
        fattr->du.nfs2.blocksize = ntohl(*p++);
        rdev = ntohl(*p++);
        fattr->du.nfs2.blocks = ntohl(*p++);
        fattr->fsid.major = ntohl(*p++);
        fattr->fsid.minor = 0;
        fattr->fileid = ntohl(*p++);
        p = xdr_decode_time(p, &fattr->atime);
        p = xdr_decode_time(p, &fattr->mtime);
        p = xdr_decode_time(p, &fattr->ctime);
        fattr->valid |= NFS_ATTR_FATTR;
        fattr->rdev = new_decode_dev(rdev);
        if (fattr->type == NFCHR && rdev == NFS2_FIFO_DEV) {
                fattr->type = NFFIFO;
                fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO;
                fattr->rdev = 0;
        }
        return p;
}

static inline __be32 *
xdr_encode_sattr(__be32 *p, struct iattr *attr)
{
        const __be32 not_set = __constant_htonl(0xFFFFFFFF);

        *p++ = (attr->ia_valid & ATTR_MODE) ? htonl(attr->ia_mode) : not_set;
        *p++ = (attr->ia_valid & ATTR_UID) ? htonl(attr->ia_uid) : not_set;
        *p++ = (attr->ia_valid & ATTR_GID) ? htonl(attr->ia_gid) : not_set;
        *p++ = (attr->ia_valid & ATTR_SIZE) ? htonl(attr->ia_size) : not_set;

        if (attr->ia_valid & ATTR_ATIME_SET) {
                p = xdr_encode_time(p, &attr->ia_atime);
        } else if (attr->ia_valid & ATTR_ATIME) {
                p = xdr_encode_current_server_time(p, &attr->ia_atime);
        } else {
                *p++ = not_set;
                *p++ = not_set;
        }

        if (attr->ia_valid & ATTR_MTIME_SET) {
                p = xdr_encode_time(p, &attr->ia_mtime);
        } else if (attr->ia_valid & ATTR_MTIME) {
                p = xdr_encode_current_server_time(p, &attr->ia_mtime);
        } else {
                *p++ = not_set; 
                *p++ = not_set;
        }
        return p;
}

/*
 * NFS encode functions
 */
/*
 * Encode file handle argument
 * GETATTR, READLINK, STATFS
 */
static int
nfs_xdr_fhandle(struct rpc_rqst *req, __be32 *p, struct nfs_fh *fh)
{
        p = xdr_encode_fhandle(p, fh);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
        return 0;
}

/*
 * Encode SETATTR arguments
 */
static int
nfs_xdr_sattrargs(struct rpc_rqst *req, __be32 *p, struct nfs_sattrargs *args)
{
        p = xdr_encode_fhandle(p, args->fh);
        p = xdr_encode_sattr(p, args->sattr);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
        return 0;
}

/*
 * Encode directory ops argument
 * LOOKUP, RMDIR
 */
static int
nfs_xdr_diropargs(struct rpc_rqst *req, __be32 *p, struct nfs_diropargs *args)
{
        p = xdr_encode_fhandle(p, args->fh);
        p = xdr_encode_array(p, args->name, args->len);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
        return 0;
}

/*
 * Encode REMOVE argument
 */
static int
nfs_xdr_removeargs(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
{
        p = xdr_encode_fhandle(p, args->fh);
        p = xdr_encode_array(p, args->name.name, args->name.len);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
        return 0;
}

/*
 * Arguments to a READ call. Since we read data directly into the page
 * cache, we also set up the reply iovec here so that iov[1] points
 * exactly to the page we want to fetch.
 */
static int
nfs_xdr_readargs(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
{
        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
        unsigned int replen;
        u32 offset = (u32)args->offset;
        u32 count = args->count;

        p = xdr_encode_fhandle(p, args->fh);
        *p++ = htonl(offset);
        *p++ = htonl(count);
        *p++ = htonl(count);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);

        /* Inline the page array */
        replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readres_sz) << 2;
        xdr_inline_pages(&req->rq_rcv_buf, replen,
                         args->pages, args->pgbase, count);
        req->rq_rcv_buf.flags |= XDRBUF_READ;
        return 0;
}

/*
 * Decode READ reply
 */
static int
nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
{
        struct kvec *iov = req->rq_rcv_buf.head;
        size_t hdrlen;
        u32 count, recvd;
        int status;

        if ((status = ntohl(*p++)))
                return nfs_stat_to_errno(status);
        p = xdr_decode_fattr(p, res->fattr);

        count = ntohl(*p++);
        res->eof = 0;
        hdrlen = (u8 *) p - (u8 *) iov->iov_base;
        if (iov->iov_len < hdrlen) {
                dprintk("NFS: READ reply header overflowed:"
                                "length %Zu > %Zu\n", hdrlen, iov->iov_len);
                return -errno_NFSERR_IO;
        } else if (iov->iov_len != hdrlen) {
                dprintk("NFS: READ header is short. iovec will be shifted.\n");
                xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
        }

        recvd = req->rq_rcv_buf.len - hdrlen;
        if (count > recvd) {
                dprintk("NFS: server cheating in read reply: "
                        "count %u > recvd %u\n", count, recvd);
                count = recvd;
        }

        dprintk("RPC:      readres OK count %u\n", count);
        if (count < res->count)
                res->count = count;

        return count;
}


/*
 * Write arguments. Splice the buffer to be written into the iovec.
 */
static int
nfs_xdr_writeargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
{
        struct xdr_buf *sndbuf = &req->rq_snd_buf;
        u32 offset = (u32)args->offset;
        u32 count = args->count;

        p = xdr_encode_fhandle(p, args->fh);
        *p++ = htonl(offset);
        *p++ = htonl(offset);
        *p++ = htonl(count);
        *p++ = htonl(count);
        sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);

        /* Copy the page array */
        xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
        sndbuf->flags |= XDRBUF_WRITE;
        return 0;
}

/*
 * Encode create arguments
 * CREATE, MKDIR
 */
static int
nfs_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs_createargs *args)
{
        p = xdr_encode_fhandle(p, args->fh);
        p = xdr_encode_array(p, args->name, args->len);
        p = xdr_encode_sattr(p, args->sattr);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
        return 0;
}

/*
 * Encode RENAME arguments
 */
static int
nfs_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs_renameargs *args)
{
        p = xdr_encode_fhandle(p, args->fromfh);
        p = xdr_encode_array(p, args->fromname, args->fromlen);
        p = xdr_encode_fhandle(p, args->tofh);
        p = xdr_encode_array(p, args->toname, args->tolen);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
        return 0;
}

/*
 * Encode LINK arguments
 */
static int
nfs_xdr_linkargs(struct rpc_rqst *req, __be32 *p, struct nfs_linkargs *args)
{
        p = xdr_encode_fhandle(p, args->fromfh);
        p = xdr_encode_fhandle(p, args->tofh);
        p = xdr_encode_array(p, args->toname, args->tolen);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
        return 0;
}

/*
 * Encode SYMLINK arguments
 */
static int
nfs_xdr_symlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs_symlinkargs *args)
{
        struct xdr_buf *sndbuf = &req->rq_snd_buf;
        size_t pad;

        p = xdr_encode_fhandle(p, args->fromfh);
        p = xdr_encode_array(p, args->fromname, args->fromlen);
        *p++ = htonl(args->pathlen);
        sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);

        xdr_encode_pages(sndbuf, args->pages, 0, args->pathlen);

        /*
         * xdr_encode_pages may have added a few bytes to ensure the
         * pathname ends on a 4-byte boundary.  Start encoding the
         * attributes after the pad bytes.
         */
        pad = sndbuf->tail->iov_len;
        if (pad > 0)
                p++;
        p = xdr_encode_sattr(p, args->sattr);
        sndbuf->len += xdr_adjust_iovec(sndbuf->tail, p) - pad;
        return 0;
}

/*
 * Encode arguments to readdir call
 */
static int
nfs_xdr_readdirargs(struct rpc_rqst *req, __be32 *p, struct nfs_readdirargs *args)
{
        struct rpc_task *task = req->rq_task;
        struct rpc_auth *auth = task->tk_msg.rpc_cred->cr_auth;
        unsigned int replen;
        u32 count = args->count;

        p = xdr_encode_fhandle(p, args->fh);
        *p++ = htonl(args->cookie);
        *p++ = htonl(count); /* see above */
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);

        /* Inline the page array */
        replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readdirres_sz) << 2;
        xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
        return 0;
}

/*
 * Decode the result of a readdir call.
 * We're not really decoding anymore, we just leave the buffer untouched
 * and only check that it is syntactically correct.
 * The real decoding happens in nfs_decode_entry below, called directly
 * from nfs_readdir for each entry.
 */
static int
nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
{
        struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
        struct kvec *iov = rcvbuf->head;
        struct page **page;
        size_t hdrlen;
        unsigned int pglen, recvd;
        u32 len;
        int status, nr = 0;
        __be32 *end, *entry, *kaddr;

        if ((status = ntohl(*p++)))
                return nfs_stat_to_errno(status);

        hdrlen = (u8 *) p - (u8 *) iov->iov_base;
        if (iov->iov_len < hdrlen) {
                dprintk("NFS: READDIR reply header overflowed:"
                                "length %Zu > %Zu\n", hdrlen, iov->iov_len);
                return -errno_NFSERR_IO;
        } else if (iov->iov_len != hdrlen) {
                dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
                xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
        }

        pglen = rcvbuf->page_len;
        recvd = rcvbuf->len - hdrlen;
        if (pglen > recvd)
                pglen = recvd;
        page = rcvbuf->pages;
        kaddr = p = kmap_atomic(*page, KM_USER0);
        end = (__be32 *)((char *)p + pglen);
        entry = p;

        /* Make sure the packet actually has a value_follows and EOF entry */
        if ((entry + 1) > end)
                goto short_pkt;

        for (; *p++; nr++) {
                if (p + 2 > end)
                        goto short_pkt;
                p++; /* fileid */
                len = ntohl(*p++);
                p += XDR_QUADLEN(len) + 1;      /* name plus cookie */
                if (len > NFS2_MAXNAMLEN) {
                        dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
                                                len);
                        goto err_unmap;
                }
                if (p + 2 > end)
                        goto short_pkt;
                entry = p;
        }

        /*
         * Apparently some server sends responses that are a valid size, but
         * contain no entries, and have value_follows==0 and EOF==0. For
         * those, just set the EOF marker.
         */
        if (!nr && entry[1] == 0) {
                dprintk("NFS: readdir reply truncated!\n");
                entry[1] = 1;
        }
 out:
        kunmap_atomic(kaddr, KM_USER0);
        return nr;
 short_pkt:
        /*
         * When we get a short packet there are 2 possibilities. We can
         * return an error, or fix up the response to look like a valid
         * response and return what we have so far. If there are no
         * entries and the packet was short, then return -EIO. If there
         * are valid entries in the response, return them and pretend that
         * the call was successful, but incomplete. The caller can retry the
         * readdir starting at the last cookie.
         */
        entry[0] = entry[1] = 0;
        if (!nr)
                nr = -errno_NFSERR_IO;
        goto out;
err_unmap:
        nr = -errno_NFSERR_IO;
        goto out;
}

__be32 *
nfs_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
{
        if (!*p++) {
                if (!*p)
                        return ERR_PTR(-EAGAIN);
                entry->eof = 1;
                return ERR_PTR(-EBADCOOKIE);
        }

        entry->ino        = ntohl(*p++);
        entry->len        = ntohl(*p++);
        entry->name       = (const char *) p;
        p                += XDR_QUADLEN(entry->len);
        entry->prev_cookie        = entry->cookie;
        entry->cookie     = ntohl(*p++);
        entry->eof        = !p[0] && p[1];

        return p;
}

/*
 * NFS XDR decode functions
 */
/*
 * Decode simple status reply
 */
static int
nfs_xdr_stat(struct rpc_rqst *req, __be32 *p, void *dummy)
{
        int     status;

        if ((status = ntohl(*p++)) != 0)
                status = nfs_stat_to_errno(status);
        return status;
}

/*
 * Decode attrstat reply
 * GETATTR, SETATTR, WRITE
 */
static int
nfs_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
{
        int     status;

        if ((status = ntohl(*p++)))
                return nfs_stat_to_errno(status);
        xdr_decode_fattr(p, fattr);
        return 0;
}

/*
 * Decode diropres reply
 * LOOKUP, CREATE, MKDIR
 */
static int
nfs_xdr_diropres(struct rpc_rqst *req, __be32 *p, struct nfs_diropok *res)
{
        int     status;

        if ((status = ntohl(*p++)))
                return nfs_stat_to_errno(status);
        p = xdr_decode_fhandle(p, res->fh);
        xdr_decode_fattr(p, res->fattr);
        return 0;
}

/*
 * Encode READLINK args
 */
static int
nfs_xdr_readlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs_readlinkargs *args)
{
        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
        unsigned int replen;

        p = xdr_encode_fhandle(p, args->fh);
        req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);

        /* Inline the page array */
        replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readlinkres_sz) << 2;
        xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
        return 0;
}

/*
 * Decode READLINK reply
 */
static int
nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
{
        struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
        struct kvec *iov = rcvbuf->head;
        size_t hdrlen;
        u32 len, recvd;
        char    *kaddr;
        int     status;

        if ((status = ntohl(*p++)))
                return nfs_stat_to_errno(status);
        /* Convert length of symlink */
        len = ntohl(*p++);
        if (len >= rcvbuf->page_len) {
                dprintk("nfs: server returned giant symlink!\n");
                return -ENAMETOOLONG;
        }
        hdrlen = (u8 *) p - (u8 *) iov->iov_base;
        if (iov->iov_len < hdrlen) {
                dprintk("NFS: READLINK reply header overflowed:"
                                "length %Zu > %Zu\n", hdrlen, iov->iov_len);
                return -errno_NFSERR_IO;
        } else if (iov->iov_len != hdrlen) {
                dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
                xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
        }
        recvd = req->rq_rcv_buf.len - hdrlen;
        if (recvd < len) {
                dprintk("NFS: server cheating in readlink reply: "
                                "count %u > recvd %u\n", len, recvd);
                return -EIO;
        }

        /* NULL terminate the string we got */
        kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
        kaddr[len+rcvbuf->page_base] = '\0';
        kunmap_atomic(kaddr, KM_USER0);
        return 0;
}

/*
 * Decode WRITE reply
 */
static int
nfs_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
{
        res->verf->committed = NFS_FILE_SYNC;
        return nfs_xdr_attrstat(req, p, res->fattr);
}

/*
 * Decode STATFS reply
 */
static int
nfs_xdr_statfsres(struct rpc_rqst *req, __be32 *p, struct nfs2_fsstat *res)
{
        int     status;

        if ((status = ntohl(*p++)))
                return nfs_stat_to_errno(status);

        res->tsize  = ntohl(*p++);
        res->bsize  = ntohl(*p++);
        res->blocks = ntohl(*p++);
        res->bfree  = ntohl(*p++);
        res->bavail = ntohl(*p++);
        return 0;
}

/*
 * We need to translate between nfs status return values and
 * the local errno values which may not be the same.
 */
static 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,   -ESERVERFAULT   },
        { NFSERR_BADTYPE,       -EBADTYPE       },
        { NFSERR_JUKEBOX,       -EJUKEBOX       },
        { -1,                   -EIO            }
};

/*
 * Convert an NFS error code to a local one.
 * This one is used jointly by NFSv2 and NFSv3.
 */
int
nfs_stat_to_errno(int stat)
{
        int i;

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

#define PROC(proc, argtype, restype, timer)                             \
[NFSPROC_##proc] = {                                                    \
        .p_proc     =  NFSPROC_##proc,                                  \
        .p_encode   =  (kxdrproc_t) nfs_xdr_##argtype,                  \
        .p_decode   =  (kxdrproc_t) nfs_xdr_##restype,                  \
        .p_arglen   =  NFS_##argtype##_sz,                              \
        .p_replen   =  NFS_##restype##_sz,                              \
        .p_timer    =  timer,                                           \
        .p_statidx  =  NFSPROC_##proc,                                  \
        .p_name     =  #proc,                                           \
        }
struct rpc_procinfo     nfs_procedures[] = {
    PROC(GETATTR,       fhandle,        attrstat, 1),
    PROC(SETATTR,       sattrargs,      attrstat, 0),
    PROC(LOOKUP,        diropargs,      diropres, 2),
    PROC(READLINK,      readlinkargs,   readlinkres, 3),
    PROC(READ,          readargs,       readres, 3),
    PROC(WRITE,         writeargs,      writeres, 4),
    PROC(CREATE,        createargs,     diropres, 0),
    PROC(REMOVE,        removeargs,     stat, 0),
    PROC(RENAME,        renameargs,     stat, 0),
    PROC(LINK,          linkargs,       stat, 0),
    PROC(SYMLINK,       symlinkargs,    stat, 0),
    PROC(MKDIR,         createargs,     diropres, 0),
    PROC(RMDIR,         diropargs,      stat, 0),
    PROC(READDIR,       readdirargs,    readdirres, 3),
    PROC(STATFS,        fhandle,        statfsres, 0),
};

struct rpc_version              nfs_version2 = {
        .number                 = 2,
        .nrprocs                = ARRAY_SIZE(nfs_procedures),
        .procs                  = nfs_procedures
};