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nfs3xdr.c

/*
 * linux/fs/nfsd/nfs3xdr.c
 *
 * XDR support for nfsd/protocol version 3.
 *
 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
 *
 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
 */

#include <linux/types.h>
#include <linux/time.h>
#include <linux/nfs3.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/vfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/xdr3.h>

#define NFSDDBG_FACILITY            NFSDDBG_XDR


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

/*
 * XDR functions for basic NFS types
 */
static __be32 *
encode_time3(__be32 *p, struct timespec *time)
{
      *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
      return p;
}

static __be32 *
decode_time3(__be32 *p, struct timespec *time)
{
      time->tv_sec = ntohl(*p++);
      time->tv_nsec = ntohl(*p++);
      return p;
}

static __be32 *
decode_fh(__be32 *p, struct svc_fh *fhp)
{
      unsigned int size;
      fh_init(fhp, NFS3_FHSIZE);
      size = ntohl(*p++);
      if (size > NFS3_FHSIZE)
            return NULL;

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

/* Helper function for NFSv3 ACL code */
__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
{
      return decode_fh(p, fhp);
}

static __be32 *
encode_fh(__be32 *p, struct svc_fh *fhp)
{
      unsigned int size = fhp->fh_handle.fh_size;
      *p++ = htonl(size);
      if (size) p[XDR_QUADLEN(size)-1]=0;
      memcpy(p, &fhp->fh_handle.fh_base, size);
      return p + XDR_QUADLEN(size);
}

/*
 * Decode a file name and make sure that the path contains
 * no slashes or null bytes.
 */
static __be32 *
decode_filename(__be32 *p, char **namp, int *lenp)
{
      char        *name;
      int         i;

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

      return p;
}

static __be32 *
decode_sattr3(__be32 *p, struct iattr *iap)
{
      u32   tmp;

      iap->ia_valid = 0;

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

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

static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
{
      u64 f;
      switch(fsid_source(fhp)) {
      default:
      case FSIDSOURCE_DEV:
            p = xdr_encode_hyper(p, (u64)huge_encode_dev
                             (fhp->fh_dentry->d_inode->i_sb->s_dev));
            break;
      case FSIDSOURCE_FSID:
            p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
            break;
      case FSIDSOURCE_UUID:
            f = ((u64*)fhp->fh_export->ex_uuid)[0];
            f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
            p = xdr_encode_hyper(p, f);
            break;
      }
      return p;
}

static __be32 *
encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
            struct kstat *stat)
{
      *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
      *p++ = htonl((u32) stat->mode);
      *p++ = htonl((u32) stat->nlink);
      *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
      *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
      if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
            p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
      } else {
            p = xdr_encode_hyper(p, (u64) stat->size);
      }
      p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
      *p++ = htonl((u32) MAJOR(stat->rdev));
      *p++ = htonl((u32) MINOR(stat->rdev));
      p = encode_fsid(p, fhp);
      p = xdr_encode_hyper(p, stat->ino);
      p = encode_time3(p, &stat->atime);
      p = encode_time3(p, &stat->mtime);
      p = encode_time3(p, &stat->ctime);

      return p;
}

static __be32 *
encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
      /* Attributes to follow */
      *p++ = xdr_one;
      return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
}

/*
 * Encode post-operation attributes.
 * The inode may be NULL if the call failed because of a stale file
 * handle. In this case, no attributes are returned.
 */
static __be32 *
encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
      struct dentry *dentry = fhp->fh_dentry;
      if (dentry && dentry->d_inode) {
              int err;
            struct kstat stat;

            err = vfs_getattr(fhp->fh_export->ex_mnt, dentry, &stat);
            if (!err) {
                  *p++ = xdr_one;         /* attributes follow */
                  lease_get_mtime(dentry->d_inode, &stat.mtime);
                  return encode_fattr3(rqstp, p, fhp, &stat);
            }
      }
      *p++ = xdr_zero;
      return p;
}

/* Helper for NFSv3 ACLs */
__be32 *
nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
      return encode_post_op_attr(rqstp, p, fhp);
}

/*
 * Enocde weak cache consistency data
 */
static __be32 *
encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
      struct dentry     *dentry = fhp->fh_dentry;

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

/*
 * Fill in the post_op attr for the wcc data
 */
void fill_post_wcc(struct svc_fh *fhp)
{
      int err;

      if (fhp->fh_post_saved)
            printk("nfsd: inode locked twice during operation.\n");

      err = vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry,
                  &fhp->fh_post_attr);
      if (err)
            fhp->fh_post_saved = 0;
      else
            fhp->fh_post_saved = 1;
}

/*
 * XDR decode functions
 */
int
nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
{
      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_sattrargs *args)
{
      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      p = decode_sattr3(p, &args->attrs);

      if ((args->check_guard = ntohl(*p++)) != 0) { 
            struct timespec time; 
            p = decode_time3(p, &time);
            args->guardtime = time.tv_sec;
      }

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_diropargs *args)
{
      if (!(p = decode_fh(p, &args->fh))
       || !(p = decode_filename(p, &args->name, &args->len)))
            return 0;

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_accessargs *args)
{
      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      args->access = ntohl(*p++);

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_readargs *args)
{
      unsigned int len;
      int v,pn;
      u32 max_blocksize = svc_max_payload(rqstp);

      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      p = xdr_decode_hyper(p, &args->offset);

      len = args->count = ntohl(*p++);

      if (len > max_blocksize)
            len = max_blocksize;

      /* set up the kvec */
      v=0;
      while (len > 0) {
            pn = rqstp->rq_resused++;
            rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
            rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
            len -= rqstp->rq_vec[v].iov_len;
            v++;
      }
      args->vlen = v;
      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_writeargs *args)
{
      unsigned int len, v, hdr, dlen;
      u32 max_blocksize = svc_max_payload(rqstp);

      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      p = xdr_decode_hyper(p, &args->offset);

      args->count = ntohl(*p++);
      args->stable = ntohl(*p++);
      len = args->len = ntohl(*p++);
      /*
       * The count must equal the amount of data passed.
       */
      if (args->count != args->len)
            return 0;

      /*
       * Check to make sure that we got the right number of
       * bytes.
       */
      hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
      dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
            - hdr;
      /*
       * Round the length of the data which was specified up to
       * the next multiple of XDR units and then compare that
       * against the length which was actually received.
       * Note that when RPCSEC/GSS (for example) is used, the
       * data buffer can be padded so dlen might be larger
       * than required.  It must never be smaller.
       */
      if (dlen < XDR_QUADLEN(len)*4)
            return 0;

      if (args->count > max_blocksize) {
            args->count = max_blocksize;
            len = args->len = max_blocksize;
      }
      rqstp->rq_vec[0].iov_base = (void*)p;
      rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
      v = 0;
      while (len > rqstp->rq_vec[v].iov_len) {
            len -= rqstp->rq_vec[v].iov_len;
            v++;
            rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
            rqstp->rq_vec[v].iov_len = PAGE_SIZE;
      }
      rqstp->rq_vec[v].iov_len = len;
      args->vlen = v + 1;
      return 1;
}

int
nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_createargs *args)
{
      if (!(p = decode_fh(p, &args->fh))
       || !(p = decode_filename(p, &args->name, &args->len)))
            return 0;

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

      return xdr_argsize_check(rqstp, p);
}
int
nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_createargs *args)
{
      if (!(p = decode_fh(p, &args->fh)) ||
          !(p = decode_filename(p, &args->name, &args->len)))
            return 0;
      p = decode_sattr3(p, &args->attrs);

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_symlinkargs *args)
{
      unsigned int len;
      int avail;
      char *old, *new;
      struct kvec *vec;

      if (!(p = decode_fh(p, &args->ffh)) ||
          !(p = decode_filename(p, &args->fname, &args->flen))
            )
            return 0;
      p = decode_sattr3(p, &args->attrs);

      /* now decode the pathname, which might be larger than the first page.
       * As we have to check for nul's anyway, we copy it into a new page
       * This page appears in the rq_res.pages list, but as pages_len is always
       * 0, it won't get in the way
       */
      len = ntohl(*p++);
      if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
            return 0;
      args->tname = new =
            page_address(rqstp->rq_respages[rqstp->rq_resused++]);
      args->tlen = len;
      /* first copy and check from the first page */
      old = (char*)p;
      vec = &rqstp->rq_arg.head[0];
      avail = vec->iov_len - (old - (char*)vec->iov_base);
      while (len && avail && *old) {
            *new++ = *old++;
            len--;
            avail--;
      }
      /* now copy next page if there is one */
      if (len && !avail && rqstp->rq_arg.page_len) {
            avail = rqstp->rq_arg.page_len;
            if (avail > PAGE_SIZE) avail = PAGE_SIZE;
            old = page_address(rqstp->rq_arg.pages[0]);
      }
      while (len && avail && *old) {
            *new++ = *old++;
            len--;
            avail--;
      }
      *new = '\0';
      if (len)
            return 0;

      return 1;
}

int
nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_mknodargs *args)
{
      if (!(p = decode_fh(p, &args->fh))
       || !(p = decode_filename(p, &args->name, &args->len)))
            return 0;

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

      if (args->ftype == NF3BLK  || args->ftype == NF3CHR
       || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
            p = decode_sattr3(p, &args->attrs);

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

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_renameargs *args)
{
      if (!(p = decode_fh(p, &args->ffh))
       || !(p = decode_filename(p, &args->fname, &args->flen))
       || !(p = decode_fh(p, &args->tfh))
       || !(p = decode_filename(p, &args->tname, &args->tlen)))
            return 0;

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_readlinkargs *args)
{
      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      args->buffer =
            page_address(rqstp->rq_respages[rqstp->rq_resused++]);

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_linkargs *args)
{
      if (!(p = decode_fh(p, &args->ffh))
       || !(p = decode_fh(p, &args->tfh))
       || !(p = decode_filename(p, &args->tname, &args->tlen)))
            return 0;

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_readdirargs *args)
{
      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      p = xdr_decode_hyper(p, &args->cookie);
      args->verf   = p; p += 2;
      args->dircount = ~0;
      args->count  = ntohl(*p++);

      if (args->count > PAGE_SIZE)
            args->count = PAGE_SIZE;

      args->buffer =
            page_address(rqstp->rq_respages[rqstp->rq_resused++]);

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_readdirargs *args)
{
      int len, pn;
      u32 max_blocksize = svc_max_payload(rqstp);

      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      p = xdr_decode_hyper(p, &args->cookie);
      args->verf     = p; p += 2;
      args->dircount = ntohl(*p++);
      args->count    = ntohl(*p++);

      len = (args->count > max_blocksize) ? max_blocksize :
                                      args->count;
      args->count = len;

      while (len > 0) {
            pn = rqstp->rq_resused++;
            if (!args->buffer)
                  args->buffer = page_address(rqstp->rq_respages[pn]);
            len -= PAGE_SIZE;
      }

      return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_commitargs *args)
{
      if (!(p = decode_fh(p, &args->fh)))
            return 0;
      p = xdr_decode_hyper(p, &args->offset);
      args->count = ntohl(*p++);

      return xdr_argsize_check(rqstp, p);
}

/*
 * XDR encode functions
 */
/*
 * There must be an encoding function for void results so svc_process
 * will work properly.
 */
int
nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
      return xdr_ressize_check(rqstp, p);
}

/* GETATTR */
int
nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_attrstat *resp)
{
      if (resp->status == 0) {
            lease_get_mtime(resp->fh.fh_dentry->d_inode,
                        &resp->stat.mtime);
            p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
      }
      return xdr_ressize_check(rqstp, p);
}

/* SETATTR, REMOVE, RMDIR */
int
nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_attrstat *resp)
{
      p = encode_wcc_data(rqstp, p, &resp->fh);
      return xdr_ressize_check(rqstp, p);
}

/* LOOKUP */
int
nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_diropres *resp)
{
      if (resp->status == 0) {
            p = encode_fh(p, &resp->fh);
            p = encode_post_op_attr(rqstp, p, &resp->fh);
      }
      p = encode_post_op_attr(rqstp, p, &resp->dirfh);
      return xdr_ressize_check(rqstp, p);
}

/* ACCESS */
int
nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_accessres *resp)
{
      p = encode_post_op_attr(rqstp, p, &resp->fh);
      if (resp->status == 0)
            *p++ = htonl(resp->access);
      return xdr_ressize_check(rqstp, p);
}

/* READLINK */
int
nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_readlinkres *resp)
{
      p = encode_post_op_attr(rqstp, p, &resp->fh);
      if (resp->status == 0) {
            *p++ = htonl(resp->len);
            xdr_ressize_check(rqstp, p);
            rqstp->rq_res.page_len = resp->len;
            if (resp->len & 3) {
                  /* need to pad the tail */
                  rqstp->rq_res.tail[0].iov_base = p;
                  *p = 0;
                  rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
            }
            return 1;
      } else
            return xdr_ressize_check(rqstp, p);
}

/* READ */
int
nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_readres *resp)
{
      p = encode_post_op_attr(rqstp, p, &resp->fh);
      if (resp->status == 0) {
            *p++ = htonl(resp->count);
            *p++ = htonl(resp->eof);
            *p++ = htonl(resp->count);    /* xdr opaque count */
            xdr_ressize_check(rqstp, p);
            /* now update rqstp->rq_res to reflect data aswell */
            rqstp->rq_res.page_len = resp->count;
            if (resp->count & 3) {
                  /* need to pad the tail */
                  rqstp->rq_res.tail[0].iov_base = p;
                  *p = 0;
                  rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
            }
            return 1;
      } else
            return xdr_ressize_check(rqstp, p);
}

/* WRITE */
int
nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_writeres *resp)
{
      p = encode_wcc_data(rqstp, p, &resp->fh);
      if (resp->status == 0) {
            *p++ = htonl(resp->count);
            *p++ = htonl(resp->committed);
            *p++ = htonl(nfssvc_boot.tv_sec);
            *p++ = htonl(nfssvc_boot.tv_usec);
      }
      return xdr_ressize_check(rqstp, p);
}

/* CREATE, MKDIR, SYMLINK, MKNOD */
int
nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_diropres *resp)
{
      if (resp->status == 0) {
            *p++ = xdr_one;
            p = encode_fh(p, &resp->fh);
            p = encode_post_op_attr(rqstp, p, &resp->fh);
      }
      p = encode_wcc_data(rqstp, p, &resp->dirfh);
      return xdr_ressize_check(rqstp, p);
}

/* RENAME */
int
nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_renameres *resp)
{
      p = encode_wcc_data(rqstp, p, &resp->ffh);
      p = encode_wcc_data(rqstp, p, &resp->tfh);
      return xdr_ressize_check(rqstp, p);
}

/* LINK */
int
nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_linkres *resp)
{
      p = encode_post_op_attr(rqstp, p, &resp->fh);
      p = encode_wcc_data(rqstp, p, &resp->tfh);
      return xdr_ressize_check(rqstp, p);
}

/* READDIR */
int
nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_readdirres *resp)
{
      p = encode_post_op_attr(rqstp, p, &resp->fh);

      if (resp->status == 0) {
            /* stupid readdir cookie */
            memcpy(p, resp->verf, 8); p += 2;
            xdr_ressize_check(rqstp, p);
            if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
                  return 1; /*No room for trailer */
            rqstp->rq_res.page_len = (resp->count) << 2;

            /* add the 'tail' to the end of the 'head' page - page 0. */
            rqstp->rq_res.tail[0].iov_base = p;
            *p++ = 0;         /* no more entries */
            *p++ = htonl(resp->common.err == nfserr_eof);
            rqstp->rq_res.tail[0].iov_len = 2<<2;
            return 1;
      } else
            return xdr_ressize_check(rqstp, p);
}

static __be32 *
encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
           int namlen, u64 ino)
{
      *p++ = xdr_one;                      /* mark entry present */
      p    = xdr_encode_hyper(p, ino);     /* file id */
      p    = xdr_encode_array(p, name, namlen);/* name length & name */

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

      return p;
}

static __be32 *
encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p,
            struct svc_fh *fhp)
{
            p = encode_post_op_attr(cd->rqstp, p, fhp);
            *p++ = xdr_one;               /* yes, a file handle follows */
            p = encode_fh(p, fhp);
            fh_put(fhp);
            return p;
}

static int
compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
            const char *name, int namlen)
{
      struct svc_export *exp;
      struct dentry           *dparent, *dchild;
      int rv = 0;

      dparent = cd->fh.fh_dentry;
      exp  = cd->fh.fh_export;

      fh_init(fhp, NFS3_FHSIZE);
      if (isdotent(name, namlen)) {
            if (namlen == 2) {
                  dchild = dget_parent(dparent);
                  if (dchild == dparent) {
                        /* filesystem root - cannot return filehandle for ".." */
                        dput(dchild);
                        return 1;
                  }
            } else
                  dchild = dget(dparent);
      } else
            dchild = lookup_one_len(name, dparent, namlen);
      if (IS_ERR(dchild))
            return 1;
      if (d_mountpoint(dchild) ||
          fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
          !dchild->d_inode)
            rv = 1;
      dput(dchild);
      return rv;
}

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

#define NFS3_ENTRY_BAGGAGE    (2 + 1 + 2 + 1)
#define NFS3_ENTRYPLUS_BAGGAGE      (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
static int
encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
           loff_t offset, u64 ino, unsigned int d_type, int plus)
{
      struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
                                                common);
      __be32            *p = cd->buffer;
      caddr_t           curr_page_addr = NULL;
      int         pn;         /* current page number */
      int         slen;       /* string (name) length */
      int         elen;       /* estimated entry length in words */
      int         num_entry_words = 0;    /* actual number of words */

      if (cd->offset) {
            u64 offset64 = offset;

            if (unlikely(cd->offset1)) {
                  /* we ended up with offset on a page boundary */
                  *cd->offset = htonl(offset64 >> 32);
                  *cd->offset1 = htonl(offset64 & 0xffffffff);
                  cd->offset1 = NULL;
            } else {
                  xdr_encode_hyper(cd->offset, offset64);
            }
      }

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

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

      slen = XDR_QUADLEN(namlen);
      elen = slen + NFS3_ENTRY_BAGGAGE
            + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);

      if (cd->buflen < elen) {
            cd->common.err = nfserr_toosmall;
            return -EINVAL;
      }

      /* determine which page in rq_respages[] we are currently filling */
      for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
            curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);

            if (((caddr_t)cd->buffer >= curr_page_addr) &&
                ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
                  break;
      }

      if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
            /* encode entry in current page */

            p = encode_entry_baggage(cd, p, name, namlen, ino);

            /* throw in readdirplus baggage */
            if (plus) {
                  struct svc_fh     fh;

                  if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
                        *p++ = 0;
                        *p++ = 0;
                  } else
                        p = encode_entryplus_baggage(cd, p, &fh);
            }
            num_entry_words = p - cd->buffer;
      } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
            /* temporarily encode entry into next page, then move back to
             * current and next page in rq_respages[] */
            __be32 *p1, *tmp;
            int len1, len2;

            /* grab next page for temporary storage of entry */
            p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);

            p1 = encode_entry_baggage(cd, p1, name, namlen, ino);

            /* throw in readdirplus baggage */
            if (plus) {
                  struct svc_fh     fh;

                  if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
                        /* zero out the filehandle */
                        *p1++ = 0;
                        *p1++ = 0;
                  } else
                        p1 = encode_entryplus_baggage(cd, p1, &fh);
            }

            /* determine entry word length and lengths to go in pages */
            num_entry_words = p1 - tmp;
            len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
            if ((num_entry_words << 2) < len1) {
                  /* the actual number of words in the entry is less
                   * than elen and can still fit in the current page
                   */
                  memmove(p, tmp, num_entry_words << 2);
                  p += num_entry_words;

                  /* update offset */
                  cd->offset = cd->buffer + (cd->offset - tmp);
            } else {
                  unsigned int offset_r = (cd->offset - tmp) << 2;

                  /* update pointer to offset location.
                   * This is a 64bit quantity, so we need to
                   * deal with 3 cases:
                   *  - entirely in first page
                   *  - entirely in second page
                   *  - 4 bytes in each page
                   */
                  if (offset_r + 8 <= len1) {
                        cd->offset = p + (cd->offset - tmp);
                  } else if (offset_r >= len1) {
                        cd->offset -= len1 >> 2;
                  } else {
                        /* sitting on the fence */
                        BUG_ON(offset_r != len1 - 4);
                        cd->offset = p + (cd->offset - tmp);
                        cd->offset1 = tmp;
                  }

                  len2 = (num_entry_words << 2) - len1;

                  /* move from temp page to current and next pages */
                  memmove(p, tmp, len1);
                  memmove(tmp, (caddr_t)tmp+len1, len2);

                  p = tmp + (len2 >> 2);
            }
      }
      else {
            cd->common.err = nfserr_toosmall;
            return -EINVAL;
      }

      cd->buflen -= num_entry_words;
      cd->buffer = p;
      cd->common.err = nfs_ok;
      return 0;

}

int
nfs3svc_encode_entry(void *cd, const char *name,
                 int namlen, loff_t offset, u64 ino, unsigned int d_type)
{
      return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
}

int
nfs3svc_encode_entry_plus(void *cd, const char *name,
                    int namlen, loff_t offset, u64 ino,
                    unsigned int d_type)
{
      return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
}

/* FSSTAT */
int
nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_fsstatres *resp)
{
      struct kstatfs    *s = &resp->stats;
      u64         bs = s->f_bsize;

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

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

/* FSINFO */
int
nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_fsinfores *resp)
{
      *p++ = xdr_zero;  /* no post_op_attr */

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

      return xdr_ressize_check(rqstp, p);
}

/* PATHCONF */
int
nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_pathconfres *resp)
{
      *p++ = xdr_zero;  /* no post_op_attr */

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

      return xdr_ressize_check(rqstp, p);
}

/* COMMIT */
int
nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_commitres *resp)
{
      p = encode_wcc_data(rqstp, p, &resp->fh);
      /* Write verifier */
      if (resp->status == 0) {
            *p++ = htonl(nfssvc_boot.tv_sec);
            *p++ = htonl(nfssvc_boot.tv_usec);
      }
      return xdr_ressize_check(rqstp, p);
}

/*
 * XDR release functions
 */
int
nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_attrstat *resp)
{
      fh_put(&resp->fh);
      return 1;
}

int
nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
                              struct nfsd3_fhandle_pair *resp)
{
      fh_put(&resp->fh1);
      fh_put(&resp->fh2);
      return 1;
}

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