nfsproc.c

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/*
 * Process version 2 NFS requests.
 *
 * Copyright (C) 1995-1997 Olaf Kirch <[email protected]>
 */

#include <linux/namei.h>

#include "cache.h"
#include "xdr.h"
#include "vfs.h"

typedef struct svc_rqst svc_rqst;
typedef struct svc_buf  svc_buf;

#define NFSDDBG_FACILITY        NFSDDBG_PROC


static __be32
nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
    return nfs_ok;
}

static __be32
nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
{
    if (err) return err;
    return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
                    resp->fh.fh_dentry,
                    &resp->stat));
}
static __be32
nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
{
    if (err) return err;
    return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
                    resp->fh.fh_dentry,
                    &resp->stat));
}
/*
 * Get a file's attributes
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
                      struct nfsd_attrstat *resp)
{
    __be32 nfserr;
    dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));

    fh_copy(&resp->fh, &argp->fh);
    nfserr = fh_verify(rqstp, &resp->fh, 0,
            NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
    return nfsd_return_attrs(nfserr, resp);
}

/*
 * Set a file's attributes
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
                      struct nfsd_attrstat  *resp)
{
    __be32 nfserr;
    dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
        SVCFH_fmt(&argp->fh),
        argp->attrs.ia_valid, (long) argp->attrs.ia_size);

    fh_copy(&resp->fh, &argp->fh);
    nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
    return nfsd_return_attrs(nfserr, resp);
}

/*
 * Look up a path name component
 * Note: the dentry in the resp->fh may be negative if the file
 * doesn't exist yet.
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
                     struct nfsd_diropres  *resp)
{
    __be32  nfserr;

    dprintk("nfsd: LOOKUP   %s %.*s\n",
        SVCFH_fmt(&argp->fh), argp->len, argp->name);

    fh_init(&resp->fh, NFS_FHSIZE);
    nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
                 &resp->fh);

    fh_put(&argp->fh);
    return nfsd_return_dirop(nfserr, resp);
}

/*
 * Read a symlink.
 */
static __be32
nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
                       struct nfsd_readlinkres *resp)
{
    __be32  nfserr;

    dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));

    /* Read the symlink. */
    resp->len = NFS_MAXPATHLEN;
    nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);

    fh_put(&argp->fh);
    return nfserr;
}

/*
 * Read a portion of a file.
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
                       struct nfsd_readres  *resp)
{
    __be32  nfserr;

    dprintk("nfsd: READ    %s %d bytes at %d\n",
        SVCFH_fmt(&argp->fh),
        argp->count, argp->offset);

    /* Obtain buffer pointer for payload. 19 is 1 word for
     * status, 17 words for fattr, and 1 word for the byte count.
     */

    if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
        char buf[RPC_MAX_ADDRBUFLEN];
        printk(KERN_NOTICE
            "oversized read request from %s (%d bytes)\n",
                svc_print_addr(rqstp, buf, sizeof(buf)),
                argp->count);
        argp->count = NFSSVC_MAXBLKSIZE_V2;
    }
    svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);

    resp->count = argp->count;
    nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
                  argp->offset,
                  rqstp->rq_vec, argp->vlen,
                  &resp->count);

    if (nfserr) return nfserr;
    return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
                    resp->fh.fh_dentry,
                    &resp->stat));
}

/*
 * Write data to a file
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
                    struct nfsd_attrstat  *resp)
{
    __be32  nfserr;
    int stable = 1;
    unsigned long cnt = argp->len;

    dprintk("nfsd: WRITE    %s %d bytes at %d\n",
        SVCFH_fmt(&argp->fh),
        argp->len, argp->offset);

    nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
                   argp->offset,
                   rqstp->rq_vec, argp->vlen,
                       &cnt,
                   &stable);
    return nfsd_return_attrs(nfserr, resp);
}

/*
 * CREATE processing is complicated. The keyword here is `overloaded.'
 * The parent directory is kept locked between the check for existence
 * and the actual create() call in compliance with VFS protocols.
 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 */
static __be32
nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
                     struct nfsd_diropres   *resp)
{
    svc_fh      *dirfhp = &argp->fh;
    svc_fh      *newfhp = &resp->fh;
    struct iattr    *attr = &argp->attrs;
    struct inode    *inode;
    struct dentry   *dchild;
    int     type, mode;
    __be32      nfserr;
    int     hosterr;
    dev_t       rdev = 0, wanted = new_decode_dev(attr->ia_size);

    dprintk("nfsd: CREATE   %s %.*s\n",
        SVCFH_fmt(dirfhp), argp->len, argp->name);

    /* First verify the parent file handle */
    nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
    if (nfserr)
        goto done; /* must fh_put dirfhp even on error */

    /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */

    nfserr = nfserr_acces;
    if (!argp->len)
        goto done;
    nfserr = nfserr_exist;
    if (isdotent(argp->name, argp->len))
        goto done;
    hosterr = fh_want_write(dirfhp);
    if (hosterr) {
        nfserr = nfserrno(hosterr);
        goto done;
    }

    fh_lock_nested(dirfhp, I_MUTEX_PARENT);
    dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
    if (IS_ERR(dchild)) {
        nfserr = nfserrno(PTR_ERR(dchild));
        goto out_unlock;
    }
    fh_init(newfhp, NFS_FHSIZE);
    nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
    if (!nfserr && !dchild->d_inode)
        nfserr = nfserr_noent;
    dput(dchild);
    if (nfserr) {
        if (nfserr != nfserr_noent)
            goto out_unlock;
        /*
         * If the new file handle wasn't verified, we can't tell
         * whether the file exists or not. Time to bail ...
         */
        nfserr = nfserr_acces;
        if (!newfhp->fh_dentry) {
            printk(KERN_WARNING 
                "nfsd_proc_create: file handle not verified\n");
            goto out_unlock;
        }
    }

    inode = newfhp->fh_dentry->d_inode;

    /* Unfudge the mode bits */
    if (attr->ia_valid & ATTR_MODE) {
        type = attr->ia_mode & S_IFMT;
        mode = attr->ia_mode & ~S_IFMT;
        if (!type) {
            /* no type, so if target exists, assume same as that,
             * else assume a file */
            if (inode) {
                type = inode->i_mode & S_IFMT;
                switch(type) {
                case S_IFCHR:
                case S_IFBLK:
                    /* reserve rdev for later checking */
                    rdev = inode->i_rdev;
                    attr->ia_valid |= ATTR_SIZE;

                    /* FALLTHROUGH */
                case S_IFIFO:
                    /* this is probably a permission check..
                     * at least IRIX implements perm checking on
                     *   echo thing > device-special-file-or-pipe
                     * by doing a CREATE with type==0
                     */
                    nfserr = nfsd_permission(rqstp,
                                 newfhp->fh_export,
                                 newfhp->fh_dentry,
                                 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
                    if (nfserr && nfserr != nfserr_rofs)
                        goto out_unlock;
                }
            } else
                type = S_IFREG;
        }
    } else if (inode) {
        type = inode->i_mode & S_IFMT;
        mode = inode->i_mode & ~S_IFMT;
    } else {
        type = S_IFREG;
        mode = 0;   /* ??? */
    }

    attr->ia_valid |= ATTR_MODE;
    attr->ia_mode = mode;

    /* Special treatment for non-regular files according to the
     * gospel of sun micro
     */
    if (type != S_IFREG) {
        if (type != S_IFBLK && type != S_IFCHR) {
            rdev = 0;
        } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
            /* If you think you've seen the worst, grok this. */
            type = S_IFIFO;
        } else {
            /* Okay, char or block special */
            if (!rdev)
                rdev = wanted;
        }

        /* we've used the SIZE information, so discard it */
        attr->ia_valid &= ~ATTR_SIZE;

        /* Make sure the type and device matches */
        nfserr = nfserr_exist;
        if (inode && type != (inode->i_mode & S_IFMT))
            goto out_unlock;
    }

    nfserr = 0;
    if (!inode) {
        /* File doesn't exist. Create it and set attrs */
        nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
                    attr, type, rdev, newfhp);
    } else if (type == S_IFREG) {
        dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
            argp->name, attr->ia_valid, (long) attr->ia_size);
        /* File already exists. We ignore all attributes except
         * size, so that creat() behaves exactly like
         * open(..., O_CREAT|O_TRUNC|O_WRONLY).
         */
        attr->ia_valid &= ATTR_SIZE;
        if (attr->ia_valid)
            nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
    }

out_unlock:
    /* We don't really need to unlock, as fh_put does it. */
    fh_unlock(dirfhp);
    fh_drop_write(dirfhp);
done:
    fh_put(dirfhp);
    return nfsd_return_dirop(nfserr, resp);
}

static __be32
nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
                     void              *resp)
{
    __be32  nfserr;

    dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
        argp->len, argp->name);

    /* Unlink. -SIFDIR means file must not be a directory */
    nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
    fh_put(&argp->fh);
    return nfserr;
}

static __be32
nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
                     void               *resp)
{
    __be32  nfserr;

    dprintk("nfsd: RENAME   %s %.*s -> \n",
        SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
    dprintk("nfsd:        ->  %s %.*s\n",
        SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);

    nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
                    &argp->tfh, argp->tname, argp->tlen);
    fh_put(&argp->ffh);
    fh_put(&argp->tfh);
    return nfserr;
}

static __be32
nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
                void                *resp)
{
    __be32  nfserr;

    dprintk("nfsd: LINK     %s ->\n",
        SVCFH_fmt(&argp->ffh));
    dprintk("nfsd:    %s %.*s\n",
        SVCFH_fmt(&argp->tfh),
        argp->tlen,
        argp->tname);

    nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
                  &argp->ffh);
    fh_put(&argp->ffh);
    fh_put(&argp->tfh);
    return nfserr;
}

static __be32
nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
                          void            *resp)
{
    struct svc_fh   newfh;
    __be32      nfserr;

    dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
        SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
        argp->tlen, argp->tname);

    fh_init(&newfh, NFS_FHSIZE);
    /*
     * Create the link, look up new file and set attrs.
     */
    nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
                         argp->tname, argp->tlen,
                         &newfh, &argp->attrs);


    fh_put(&argp->ffh);
    fh_put(&newfh);
    return nfserr;
}

/*
 * Make directory. This operation is not idempotent.
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
                    struct nfsd_diropres   *resp)
{
    __be32  nfserr;

    dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);

    if (resp->fh.fh_dentry) {
        printk(KERN_WARNING
            "nfsd_proc_mkdir: response already verified??\n");
    }

    argp->attrs.ia_valid &= ~ATTR_SIZE;
    fh_init(&resp->fh, NFS_FHSIZE);
    nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
                    &argp->attrs, S_IFDIR, 0, &resp->fh);
    fh_put(&argp->fh);
    return nfsd_return_dirop(nfserr, resp);
}

/*
 * Remove a directory
 */
static __be32
nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
                    void              *resp)
{
    __be32  nfserr;

    dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);

    nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
    fh_put(&argp->fh);
    return nfserr;
}

/*
 * Read a portion of a directory.
 */
static __be32
nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
                      struct nfsd_readdirres  *resp)
{
    int     count;
    __be32      nfserr;
    loff_t      offset;

    dprintk("nfsd: READDIR  %s %d bytes at %d\n",
        SVCFH_fmt(&argp->fh),       
        argp->count, argp->cookie);

    /* Shrink to the client read size */
    count = (argp->count >> 2) - 2;

    /* Make sure we've room for the NULL ptr & eof flag */
    count -= 2;
    if (count < 0)
        count = 0;

    resp->buffer = argp->buffer;
    resp->offset = NULL;
    resp->buflen = count;
    resp->common.err = nfs_ok;
    /* Read directory and encode entries on the fly */
    offset = argp->cookie;
    nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, 
                  &resp->common, nfssvc_encode_entry);

    resp->count = resp->buffer - argp->buffer;
    if (resp->offset)
        *resp->offset = htonl(offset);

    fh_put(&argp->fh);
    return nfserr;
}

/*
 * Get file system info
 */
static __be32
nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
                      struct nfsd_statfsres *resp)
{
    __be32  nfserr;

    dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));

    nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
            NFSD_MAY_BYPASS_GSS_ON_ROOT);
    fh_put(&argp->fh);
    return nfserr;
}

/*
 * NFSv2 Server procedures.
 * Only the results of non-idempotent operations are cached.
 */
struct nfsd_void { int dummy; };

#define ST 1        /* status */
#define FH 8        /* filehandle */
#define AT 18       /* attributes */

static struct svc_procedure     nfsd_procedures2[18] = {
    [NFSPROC_NULL] = {
        .pc_func = (svc_procfunc) nfsd_proc_null,
        .pc_decode = (kxdrproc_t) nfssvc_decode_void,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_void),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST,
    },
    [NFSPROC_GETATTR] = {
        .pc_func = (svc_procfunc) nfsd_proc_getattr,
        .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
        .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
        .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
        .pc_argsize = sizeof(struct nfsd_fhandle),
        .pc_ressize = sizeof(struct nfsd_attrstat),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST+AT,
    },
    [NFSPROC_SETATTR] = {
        .pc_func = (svc_procfunc) nfsd_proc_setattr,
        .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
        .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
        .pc_argsize = sizeof(struct nfsd_sattrargs),
        .pc_ressize = sizeof(struct nfsd_attrstat),
        .pc_cachetype = RC_REPLBUFF,
        .pc_xdrressize = ST+AT,
    },
    [NFSPROC_ROOT] = {
        .pc_decode = (kxdrproc_t) nfssvc_decode_void,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_void),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST,
    },
    [NFSPROC_LOOKUP] = {
        .pc_func = (svc_procfunc) nfsd_proc_lookup,
        .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
        .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
        .pc_argsize = sizeof(struct nfsd_diropargs),
        .pc_ressize = sizeof(struct nfsd_diropres),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST+FH+AT,
    },
    [NFSPROC_READLINK] = {
        .pc_func = (svc_procfunc) nfsd_proc_readlink,
        .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
        .pc_argsize = sizeof(struct nfsd_readlinkargs),
        .pc_ressize = sizeof(struct nfsd_readlinkres),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
    },
    [NFSPROC_READ] = {
        .pc_func = (svc_procfunc) nfsd_proc_read,
        .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
        .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
        .pc_argsize = sizeof(struct nfsd_readargs),
        .pc_ressize = sizeof(struct nfsd_readres),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
    },
    [NFSPROC_WRITECACHE] = {
        .pc_decode = (kxdrproc_t) nfssvc_decode_void,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_void),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST,
    },
    [NFSPROC_WRITE] = {
        .pc_func = (svc_procfunc) nfsd_proc_write,
        .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
        .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
        .pc_argsize = sizeof(struct nfsd_writeargs),
        .pc_ressize = sizeof(struct nfsd_attrstat),
        .pc_cachetype = RC_REPLBUFF,
        .pc_xdrressize = ST+AT,
    },
    [NFSPROC_CREATE] = {
        .pc_func = (svc_procfunc) nfsd_proc_create,
        .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
        .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
        .pc_argsize = sizeof(struct nfsd_createargs),
        .pc_ressize = sizeof(struct nfsd_diropres),
        .pc_cachetype = RC_REPLBUFF,
        .pc_xdrressize = ST+FH+AT,
    },
    [NFSPROC_REMOVE] = {
        .pc_func = (svc_procfunc) nfsd_proc_remove,
        .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_diropargs),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_REPLSTAT,
        .pc_xdrressize = ST,
    },
    [NFSPROC_RENAME] = {
        .pc_func = (svc_procfunc) nfsd_proc_rename,
        .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_renameargs),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_REPLSTAT,
        .pc_xdrressize = ST,
    },
    [NFSPROC_LINK] = {
        .pc_func = (svc_procfunc) nfsd_proc_link,
        .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_linkargs),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_REPLSTAT,
        .pc_xdrressize = ST,
    },
    [NFSPROC_SYMLINK] = {
        .pc_func = (svc_procfunc) nfsd_proc_symlink,
        .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_symlinkargs),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_REPLSTAT,
        .pc_xdrressize = ST,
    },
    [NFSPROC_MKDIR] = {
        .pc_func = (svc_procfunc) nfsd_proc_mkdir,
        .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
        .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
        .pc_argsize = sizeof(struct nfsd_createargs),
        .pc_ressize = sizeof(struct nfsd_diropres),
        .pc_cachetype = RC_REPLBUFF,
        .pc_xdrressize = ST+FH+AT,
    },
    [NFSPROC_RMDIR] = {
        .pc_func = (svc_procfunc) nfsd_proc_rmdir,
        .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_void,
        .pc_argsize = sizeof(struct nfsd_diropargs),
        .pc_ressize = sizeof(struct nfsd_void),
        .pc_cachetype = RC_REPLSTAT,
        .pc_xdrressize = ST,
    },
    [NFSPROC_READDIR] = {
        .pc_func = (svc_procfunc) nfsd_proc_readdir,
        .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
        .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
        .pc_argsize = sizeof(struct nfsd_readdirargs),
        .pc_ressize = sizeof(struct nfsd_readdirres),
        .pc_cachetype = RC_NOCACHE,
    },
    [NFSPROC_STATFS] = {
        .pc_func = (svc_procfunc) nfsd_proc_statfs,
        .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
        .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
        .pc_argsize = sizeof(struct nfsd_fhandle),
        .pc_ressize = sizeof(struct nfsd_statfsres),
        .pc_cachetype = RC_NOCACHE,
        .pc_xdrressize = ST+5,
    },
};


struct svc_version  nfsd_version2 = {
        .vs_vers    = 2,
        .vs_nproc   = 18,
        .vs_proc    = nfsd_procedures2,
        .vs_dispatch    = nfsd_dispatch,
        .vs_xdrsize = NFS2_SVC_XDRSIZE,
};

/*
 * Map errnos to NFS errnos.
 */
__be32
nfserrno (int errno)
{
    static struct {
        __be32  nfserr;
        int syserr;
    } nfs_errtbl[] = {
        { nfs_ok, 0 },
        { nfserr_perm, -EPERM },
        { nfserr_noent, -ENOENT },
        { nfserr_io, -EIO },
        { nfserr_nxio, -ENXIO },
        { nfserr_acces, -EACCES },
        { nfserr_exist, -EEXIST },
        { nfserr_xdev, -EXDEV },
        { nfserr_mlink, -EMLINK },
        { 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 },
#ifdef EDQUOT
        { nfserr_dquot, -EDQUOT },
#endif
        { nfserr_stale, -ESTALE },
        { nfserr_jukebox, -ETIMEDOUT },
        { nfserr_jukebox, -ERESTARTSYS },
        { nfserr_jukebox, -EAGAIN },
        { nfserr_jukebox, -EWOULDBLOCK },
        { nfserr_jukebox, -ENOMEM },
        { nfserr_io, -ETXTBSY },
        { nfserr_notsupp, -EOPNOTSUPP },
        { nfserr_toosmall, -ETOOSMALL },
        { nfserr_serverfault, -ESERVERFAULT },
    };
    int i;

    for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
        if (nfs_errtbl[i].syserr == errno)
            return nfs_errtbl[i].nfserr;
    }
    printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
    return nfserr_io;
}