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nfs4proc.c

/*
 *  fs/nfsd/nfs4proc.c
 *
 *  Server-side procedures for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson   <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/param.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/file.h>

#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfs4.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>
#include <linux/nfs4_acl.h>
#include <linux/sunrpc/gss_api.h>

#define NFSDDBG_FACILITY            NFSDDBG_PROC

static inline void
fh_dup2(struct svc_fh *dst, struct svc_fh *src)
{
      fh_put(dst);
      dget(src->fh_dentry);
      if (src->fh_export)
            cache_get(&src->fh_export->h);
      *dst = *src;
}

static __be32
do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
{
      __be32 status;

      if (open->op_truncate &&
            !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
            return nfserr_inval;

      if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
            accmode |= MAY_READ;
      if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
            accmode |= (MAY_WRITE | MAY_TRUNC);
      if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
            accmode |= MAY_WRITE;

      status = fh_verify(rqstp, current_fh, S_IFREG, accmode);

      return status;
}

static __be32
do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
      struct svc_fh resfh;
      __be32 status;
      int created = 0;

      fh_init(&resfh, NFS4_FHSIZE);
      open->op_truncate = 0;

      if (open->op_create) {
            /*
             * Note: create modes (UNCHECKED,GUARDED...) are the same
             * in NFSv4 as in v3.
             */
            status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
                              open->op_fname.len, &open->op_iattr,
                              &resfh, open->op_createmode,
                              (u32 *)open->op_verf.data,
                              &open->op_truncate, &created);

            /* If we ever decide to use different attrs to store the
             * verifier in nfsd_create_v3, then we'll need to change this
             */
            if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
                  open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
                                    FATTR4_WORD1_TIME_MODIFY);
      } else {
            status = nfsd_lookup(rqstp, current_fh,
                             open->op_fname.data, open->op_fname.len, &resfh);
            fh_unlock(current_fh);
      }
      if (status)
            goto out;

      set_change_info(&open->op_cinfo, current_fh);

      /* set reply cache */
      fh_dup2(current_fh, &resfh);
      open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size;
      memcpy(open->op_stateowner->so_replay.rp_openfh,
                  &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);

      if (!created)
            status = do_open_permission(rqstp, current_fh, open, MAY_NOP);

out:
      fh_put(&resfh);
      return status;
}

static __be32
do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
      __be32 status;

      /* Only reclaims from previously confirmed clients are valid */
      if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
            return status;

      /* We don't know the target directory, and therefore can not
      * set the change info
      */

      memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));

      /* set replay cache */
      open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
      memcpy(open->op_stateowner->so_replay.rp_openfh,
            &current_fh->fh_handle.fh_base,
            current_fh->fh_handle.fh_size);

      open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
            (open->op_iattr.ia_size == 0);

      status = do_open_permission(rqstp, current_fh, open, MAY_OWNER_OVERRIDE);

      return status;
}


static __be32
nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         struct nfsd4_open *open)
{
      __be32 status;
      dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
            (int)open->op_fname.len, open->op_fname.data,
            open->op_stateowner);

      /* This check required by spec. */
      if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
            return nfserr_inval;

      nfs4_lock_state();

      /* check seqid for replay. set nfs4_owner */
      status = nfsd4_process_open1(open);
      if (status == nfserr_replay_me) {
            struct nfs4_replay *rp = &open->op_stateowner->so_replay;
            fh_put(&cstate->current_fh);
            cstate->current_fh.fh_handle.fh_size = rp->rp_openfh_len;
            memcpy(&cstate->current_fh.fh_handle.fh_base, rp->rp_openfh,
                        rp->rp_openfh_len);
            status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
            if (status)
                  dprintk("nfsd4_open: replay failed"
                        " restoring previous filehandle\n");
            else
                  status = nfserr_replay_me;
      }
      if (status)
            goto out;

      /* Openowner is now set, so sequence id will get bumped.  Now we need
       * these checks before we do any creates: */
      status = nfserr_grace;
      if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
            goto out;
      status = nfserr_no_grace;
      if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
            goto out;

      switch (open->op_claim_type) {
            case NFS4_OPEN_CLAIM_DELEGATE_CUR:
                  status = nfserr_inval;
                  if (open->op_create)
                        goto out;
                  /* fall through */
            case NFS4_OPEN_CLAIM_NULL:
                  /*
                   * (1) set CURRENT_FH to the file being opened,
                   * creating it if necessary, (2) set open->op_cinfo,
                   * (3) set open->op_truncate if the file is to be
                   * truncated after opening, (4) do permission checking.
                   */
                  status = do_open_lookup(rqstp, &cstate->current_fh,
                                    open);
                  if (status)
                        goto out;
                  break;
            case NFS4_OPEN_CLAIM_PREVIOUS:
                  open->op_stateowner->so_confirmed = 1;
                  /*
                   * The CURRENT_FH is already set to the file being
                   * opened.  (1) set open->op_cinfo, (2) set
                   * open->op_truncate if the file is to be truncated
                   * after opening, (3) do permission checking.
                  */
                  status = do_open_fhandle(rqstp, &cstate->current_fh,
                                     open);
                  if (status)
                        goto out;
                  break;
                  case NFS4_OPEN_CLAIM_DELEGATE_PREV:
                  open->op_stateowner->so_confirmed = 1;
                  dprintk("NFSD: unsupported OPEN claim type %d\n",
                        open->op_claim_type);
                  status = nfserr_notsupp;
                  goto out;
            default:
                  dprintk("NFSD: Invalid OPEN claim type %d\n",
                        open->op_claim_type);
                  status = nfserr_inval;
                  goto out;
      }
      /*
       * nfsd4_process_open2() does the actual opening of the file.  If
       * successful, it (1) truncates the file if open->op_truncate was
       * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
       */
      status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
out:
      if (open->op_stateowner) {
            nfs4_get_stateowner(open->op_stateowner);
            cstate->replay_owner = open->op_stateowner;
      }
      nfs4_unlock_state();
      return status;
}

/*
 * filehandle-manipulating ops.
 */
static __be32
nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
          struct svc_fh **getfh)
{
      if (!cstate->current_fh.fh_dentry)
            return nfserr_nofilehandle;

      *getfh = &cstate->current_fh;
      return nfs_ok;
}

static __be32
nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
          struct nfsd4_putfh *putfh)
{
      fh_put(&cstate->current_fh);
      cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
      memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
             putfh->pf_fhlen);
      return fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
}

static __be32
nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            void *arg)
{
      __be32 status;

      fh_put(&cstate->current_fh);
      status = exp_pseudoroot(rqstp, &cstate->current_fh);
      return status;
}

static __be32
nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            void *arg)
{
      if (!cstate->save_fh.fh_dentry)
            return nfserr_restorefh;

      fh_dup2(&cstate->current_fh, &cstate->save_fh);
      return nfs_ok;
}

static __be32
nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           void *arg)
{
      if (!cstate->current_fh.fh_dentry)
            return nfserr_nofilehandle;

      fh_dup2(&cstate->save_fh, &cstate->current_fh);
      return nfs_ok;
}

/*
 * misc nfsv4 ops
 */
static __be32
nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_access *access)
{
      if (access->ac_req_access & ~NFS3_ACCESS_FULL)
            return nfserr_inval;

      access->ac_resp_access = access->ac_req_access;
      return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
                     &access->ac_supported);
}

static __be32
nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_commit *commit)
{
      __be32 status;

      u32 *p = (u32 *)commit->co_verf.data;
      *p++ = nfssvc_boot.tv_sec;
      *p++ = nfssvc_boot.tv_usec;

      status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
                       commit->co_count);
      if (status == nfserr_symlink)
            status = nfserr_inval;
      return status;
}

static __be32
nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_create *create)
{
      struct svc_fh resfh;
      __be32 status;
      dev_t rdev;

      fh_init(&resfh, NFS4_FHSIZE);

      status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, MAY_CREATE);
      if (status == nfserr_symlink)
            status = nfserr_notdir;
      if (status)
            return status;

      switch (create->cr_type) {
      case NF4LNK:
            /* ugh! we have to null-terminate the linktext, or
             * vfs_symlink() will choke.  it is always safe to
             * null-terminate by brute force, since at worst we
             * will overwrite the first byte of the create namelen
             * in the XDR buffer, which has already been extracted
             * during XDR decode.
             */
            create->cr_linkname[create->cr_linklen] = 0;

            status = nfsd_symlink(rqstp, &cstate->current_fh,
                              create->cr_name, create->cr_namelen,
                              create->cr_linkname, create->cr_linklen,
                              &resfh, &create->cr_iattr);
            break;

      case NF4BLK:
            rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
            if (MAJOR(rdev) != create->cr_specdata1 ||
                MINOR(rdev) != create->cr_specdata2)
                  return nfserr_inval;
            status = nfsd_create(rqstp, &cstate->current_fh,
                             create->cr_name, create->cr_namelen,
                             &create->cr_iattr, S_IFBLK, rdev, &resfh);
            break;

      case NF4CHR:
            rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
            if (MAJOR(rdev) != create->cr_specdata1 ||
                MINOR(rdev) != create->cr_specdata2)
                  return nfserr_inval;
            status = nfsd_create(rqstp, &cstate->current_fh,
                             create->cr_name, create->cr_namelen,
                             &create->cr_iattr,S_IFCHR, rdev, &resfh);
            break;

      case NF4SOCK:
            status = nfsd_create(rqstp, &cstate->current_fh,
                             create->cr_name, create->cr_namelen,
                             &create->cr_iattr, S_IFSOCK, 0, &resfh);
            break;

      case NF4FIFO:
            status = nfsd_create(rqstp, &cstate->current_fh,
                             create->cr_name, create->cr_namelen,
                             &create->cr_iattr, S_IFIFO, 0, &resfh);
            break;

      case NF4DIR:
            create->cr_iattr.ia_valid &= ~ATTR_SIZE;
            status = nfsd_create(rqstp, &cstate->current_fh,
                             create->cr_name, create->cr_namelen,
                             &create->cr_iattr, S_IFDIR, 0, &resfh);
            break;

      default:
            status = nfserr_badtype;
      }

      if (!status) {
            fh_unlock(&cstate->current_fh);
            set_change_info(&create->cr_cinfo, &cstate->current_fh);
            fh_dup2(&cstate->current_fh, &resfh);
      }

      fh_put(&resfh);
      return status;
}

static __be32
nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            struct nfsd4_getattr *getattr)
{
      __be32 status;

      status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
      if (status)
            return status;

      if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
            return nfserr_inval;

      getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
      getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;

      getattr->ga_fhp = &cstate->current_fh;
      return nfs_ok;
}

static __be32
nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         struct nfsd4_link *link)
{
      __be32 status = nfserr_nofilehandle;

      if (!cstate->save_fh.fh_dentry)
            return status;
      status = nfsd_link(rqstp, &cstate->current_fh,
                     link->li_name, link->li_namelen, &cstate->save_fh);
      if (!status)
            set_change_info(&link->li_cinfo, &cstate->current_fh);
      return status;
}

static __be32
nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            void *arg)
{
      struct svc_fh tmp_fh;
      __be32 ret;

      fh_init(&tmp_fh, NFS4_FHSIZE);
      ret = exp_pseudoroot(rqstp, &tmp_fh);
      if (ret)
            return ret;
      if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
            fh_put(&tmp_fh);
            return nfserr_noent;
      }
      fh_put(&tmp_fh);
      return nfsd_lookup(rqstp, &cstate->current_fh,
                     "..", 2, &cstate->current_fh);
}

static __be32
nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_lookup *lookup)
{
      return nfsd_lookup(rqstp, &cstate->current_fh,
                     lookup->lo_name, lookup->lo_len,
                     &cstate->current_fh);
}

static __be32
nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         struct nfsd4_read *read)
{
      __be32 status;

      /* no need to check permission - this will be done in nfsd_read() */

      read->rd_filp = NULL;
      if (read->rd_offset >= OFFSET_MAX)
            return nfserr_inval;

      nfs4_lock_state();
      /* check stateid */
      if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh,
                        &read->rd_stateid,
                        CHECK_FH | RD_STATE, &read->rd_filp))) {
            dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
            goto out;
      }
      if (read->rd_filp)
            get_file(read->rd_filp);
      status = nfs_ok;
out:
      nfs4_unlock_state();
      read->rd_rqstp = rqstp;
      read->rd_fhp = &cstate->current_fh;
      return status;
}

static __be32
nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            struct nfsd4_readdir *readdir)
{
      u64 cookie = readdir->rd_cookie;
      static const nfs4_verifier zeroverf;

      /* no need to check permission - this will be done in nfsd_readdir() */

      if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
            return nfserr_inval;

      readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
      readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;

      if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
          (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
            return nfserr_bad_cookie;

      readdir->rd_rqstp = rqstp;
      readdir->rd_fhp = &cstate->current_fh;
      return nfs_ok;
}

static __be32
nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
             struct nfsd4_readlink *readlink)
{
      readlink->rl_rqstp = rqstp;
      readlink->rl_fhp = &cstate->current_fh;
      return nfs_ok;
}

static __be32
nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_remove *remove)
{
      __be32 status;

      if (nfs4_in_grace())
            return nfserr_grace;
      status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
                       remove->rm_name, remove->rm_namelen);
      if (status == nfserr_symlink)
            return nfserr_notdir;
      if (!status) {
            fh_unlock(&cstate->current_fh);
            set_change_info(&remove->rm_cinfo, &cstate->current_fh);
      }
      return status;
}

static __be32
nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_rename *rename)
{
      __be32 status = nfserr_nofilehandle;

      if (!cstate->save_fh.fh_dentry)
            return status;
      if (nfs4_in_grace() && !(cstate->save_fh.fh_export->ex_flags
                              & NFSEXP_NOSUBTREECHECK))
            return nfserr_grace;
      status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
                       rename->rn_snamelen, &cstate->current_fh,
                       rename->rn_tname, rename->rn_tnamelen);

      /* the underlying filesystem returns different error's than required
       * by NFSv4. both save_fh and current_fh have been verified.. */
      if (status == nfserr_isdir)
            status = nfserr_exist;
      else if ((status == nfserr_notdir) &&
                  (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
                   S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
            status = nfserr_exist;
      else if (status == nfserr_symlink)
            status = nfserr_notdir;

      if (!status) {
            set_change_info(&rename->rn_sinfo, &cstate->current_fh);
            set_change_info(&rename->rn_tinfo, &cstate->save_fh);
      }
      return status;
}

static __be32
nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            struct nfsd4_secinfo *secinfo)
{
      struct svc_fh resfh;
      struct svc_export *exp;
      struct dentry *dentry;
      __be32 err;

      fh_init(&resfh, NFS4_FHSIZE);
      err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
                            secinfo->si_name, secinfo->si_namelen,
                            &exp, &dentry);
      if (err)
            return err;
      if (dentry->d_inode == NULL) {
            exp_put(exp);
            err = nfserr_noent;
      } else
            secinfo->si_exp = exp;
      dput(dentry);
      return err;
}

static __be32
nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            struct nfsd4_setattr *setattr)
{
      __be32 status = nfs_ok;

      if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
            nfs4_lock_state();
            status = nfs4_preprocess_stateid_op(&cstate->current_fh,
                  &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
            nfs4_unlock_state();
            if (status) {
                  dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
                  return status;
            }
      }
      status = nfs_ok;
      if (setattr->sa_acl != NULL)
            status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
                                  setattr->sa_acl);
      if (status)
            return status;
      status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
                        0, (time_t)0);
      return status;
}

static __be32
nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
          struct nfsd4_write *write)
{
      stateid_t *stateid = &write->wr_stateid;
      struct file *filp = NULL;
      u32 *p;
      __be32 status = nfs_ok;

      /* no need to check permission - this will be done in nfsd_write() */

      if (write->wr_offset >= OFFSET_MAX)
            return nfserr_inval;

      nfs4_lock_state();
      status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
                              CHECK_FH | WR_STATE, &filp);
      if (filp)
            get_file(filp);
      nfs4_unlock_state();

      if (status) {
            dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
            return status;
      }

      write->wr_bytes_written = write->wr_buflen;
      write->wr_how_written = write->wr_stable_how;
      p = (u32 *)write->wr_verifier.data;
      *p++ = nfssvc_boot.tv_sec;
      *p++ = nfssvc_boot.tv_usec;

      status =  nfsd_write(rqstp, &cstate->current_fh, filp,
                       write->wr_offset, rqstp->rq_vec, write->wr_vlen,
                       write->wr_buflen, &write->wr_how_written);
      if (filp)
            fput(filp);

      if (status == nfserr_symlink)
            status = nfserr_inval;
      return status;
}

/* This routine never returns NFS_OK!  If there are no other errors, it
 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 */
static __be32
_nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_verify *verify)
{
      __be32 *buf, *p;
      int count;
      __be32 status;

      status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
      if (status)
            return status;

      if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
          || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
            return nfserr_attrnotsupp;
      if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
          || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
            return nfserr_inval;
      if (verify->ve_attrlen & 3)
            return nfserr_inval;

      /* count in words:
       *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
       */
      count = 4 + (verify->ve_attrlen >> 2);
      buf = kmalloc(count << 2, GFP_KERNEL);
      if (!buf)
            return nfserr_resource;

      status = nfsd4_encode_fattr(&cstate->current_fh,
                            cstate->current_fh.fh_export,
                            cstate->current_fh.fh_dentry, buf,
                            &count, verify->ve_bmval,
                            rqstp);

      /* this means that nfsd4_encode_fattr() ran out of space */
      if (status == nfserr_resource && count == 0)
            status = nfserr_not_same;
      if (status)
            goto out_kfree;

      p = buf + 3;
      status = nfserr_not_same;
      if (ntohl(*p++) != verify->ve_attrlen)
            goto out_kfree;
      if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
            status = nfserr_same;

out_kfree:
      kfree(buf);
      return status;
}

static __be32
nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            struct nfsd4_verify *verify)
{
      __be32 status;

      status = _nfsd4_verify(rqstp, cstate, verify);
      return status == nfserr_not_same ? nfs_ok : status;
}

static __be32
nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
           struct nfsd4_verify *verify)
{
      __be32 status;

      status = _nfsd4_verify(rqstp, cstate, verify);
      return status == nfserr_same ? nfs_ok : status;
}

/*
 * NULL call.
 */
static __be32
nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
      return nfs_ok;
}

static inline void nfsd4_increment_op_stats(u32 opnum)
{
      if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
            nfsdstats.nfs4_opcount[opnum]++;
}

static void cstate_free(struct nfsd4_compound_state *cstate)
{
      if (cstate == NULL)
            return;
      fh_put(&cstate->current_fh);
      fh_put(&cstate->save_fh);
      BUG_ON(cstate->replay_owner);
      kfree(cstate);
}

static struct nfsd4_compound_state *cstate_alloc(void)
{
      struct nfsd4_compound_state *cstate;

      cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
      if (cstate == NULL)
            return NULL;
      fh_init(&cstate->current_fh, NFS4_FHSIZE);
      fh_init(&cstate->save_fh, NFS4_FHSIZE);
      cstate->replay_owner = NULL;
      return cstate;
}

typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
                        void *);

struct nfsd4_operation {
      nfsd4op_func op_func;
      u32 op_flags;
/* Most ops require a valid current filehandle; a few don't: */
#define ALLOWED_WITHOUT_FH 1
/* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
#define ALLOWED_ON_ABSENT_FS 2
};

static struct nfsd4_operation nfsd4_ops[];

/*
 * COMPOUND call.
 */
static __be32
nfsd4_proc_compound(struct svc_rqst *rqstp,
                struct nfsd4_compoundargs *args,
                struct nfsd4_compoundres *resp)
{
      struct nfsd4_op   *op;
      struct nfsd4_operation *opdesc;
      struct nfsd4_compound_state *cstate = NULL;
      int         slack_bytes;
      __be32            status;

      status = nfserr_resource;
      cstate = cstate_alloc();
      if (cstate == NULL)
            goto out;

      resp->xbuf = &rqstp->rq_res;
      resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
      resp->tagp = resp->p;
      /* reserve space for: taglen, tag, and opcnt */
      resp->p += 2 + XDR_QUADLEN(args->taglen);
      resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
      resp->taglen = args->taglen;
      resp->tag = args->tag;
      resp->opcnt = 0;
      resp->rqstp = rqstp;

      /*
       * According to RFC3010, this takes precedence over all other errors.
       */
      status = nfserr_minor_vers_mismatch;
      if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
            goto out;

      status = nfs_ok;
      while (!status && resp->opcnt < args->opcnt) {
            op = &args->ops[resp->opcnt++];

            dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);

            /*
             * The XDR decode routines may have pre-set op->status;
             * for example, if there is a miscellaneous XDR error
             * it will be set to nfserr_bad_xdr.
             */
            if (op->status)
                  goto encode_op;

            /* We must be able to encode a successful response to
             * this operation, with enough room left over to encode a
             * failed response to the next operation.  If we don't
             * have enough room, fail with ERR_RESOURCE.
             */
            slack_bytes = (char *)resp->end - (char *)resp->p;
            if (slack_bytes < COMPOUND_SLACK_SPACE
                        + COMPOUND_ERR_SLACK_SPACE) {
                  BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
                  op->status = nfserr_resource;
                  goto encode_op;
            }

            opdesc = &nfsd4_ops[op->opnum];

            if (!cstate->current_fh.fh_dentry) {
                  if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
                        op->status = nfserr_nofilehandle;
                        goto encode_op;
                  }
            } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
                    !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
                  op->status = nfserr_moved;
                  goto encode_op;
            }

            if (opdesc->op_func)
                  op->status = opdesc->op_func(rqstp, cstate, &op->u);
            else
                  BUG_ON(op->status == nfs_ok);

encode_op:
            if (op->status == nfserr_replay_me) {
                  op->replay = &cstate->replay_owner->so_replay;
                  nfsd4_encode_replay(resp, op);
                  status = op->status = op->replay->rp_status;
            } else {
                  nfsd4_encode_operation(resp, op);
                  status = op->status;
            }
            if (cstate->replay_owner) {
                  nfs4_put_stateowner(cstate->replay_owner);
                  cstate->replay_owner = NULL;
            }
            /* XXX Ugh, we need to get rid of this kind of special case: */
            if (op->opnum == OP_READ && op->u.read.rd_filp)
                  fput(op->u.read.rd_filp);

            nfsd4_increment_op_stats(op->opnum);
      }

out:
      nfsd4_release_compoundargs(args);
      cstate_free(cstate);
      return status;
}

static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
      [OP_ACCESS] = {
            .op_func = (nfsd4op_func)nfsd4_access,
      },
      [OP_CLOSE] = {
            .op_func = (nfsd4op_func)nfsd4_close,
      },
      [OP_COMMIT] = {
            .op_func = (nfsd4op_func)nfsd4_commit,
      },
      [OP_CREATE] = {
            .op_func = (nfsd4op_func)nfsd4_create,
      },
      [OP_DELEGRETURN] = {
            .op_func = (nfsd4op_func)nfsd4_delegreturn,
      },
      [OP_GETATTR] = {
            .op_func = (nfsd4op_func)nfsd4_getattr,
            .op_flags = ALLOWED_ON_ABSENT_FS,
      },
      [OP_GETFH] = {
            .op_func = (nfsd4op_func)nfsd4_getfh,
      },
      [OP_LINK] = {
            .op_func = (nfsd4op_func)nfsd4_link,
      },
      [OP_LOCK] = {
            .op_func = (nfsd4op_func)nfsd4_lock,
      },
      [OP_LOCKT] = {
            .op_func = (nfsd4op_func)nfsd4_lockt,
      },
      [OP_LOCKU] = {
            .op_func = (nfsd4op_func)nfsd4_locku,
      },
      [OP_LOOKUP] = {
            .op_func = (nfsd4op_func)nfsd4_lookup,
      },
      [OP_LOOKUPP] = {
            .op_func = (nfsd4op_func)nfsd4_lookupp,
      },
      [OP_NVERIFY] = {
            .op_func = (nfsd4op_func)nfsd4_nverify,
      },
      [OP_OPEN] = {
            .op_func = (nfsd4op_func)nfsd4_open,
      },
      [OP_OPEN_CONFIRM] = {
            .op_func = (nfsd4op_func)nfsd4_open_confirm,
      },
      [OP_OPEN_DOWNGRADE] = {
            .op_func = (nfsd4op_func)nfsd4_open_downgrade,
      },
      [OP_PUTFH] = {
            .op_func = (nfsd4op_func)nfsd4_putfh,
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
      [OP_PUTPUBFH] = {
            /* unsupported; just for future reference: */
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
      [OP_PUTROOTFH] = {
            .op_func = (nfsd4op_func)nfsd4_putrootfh,
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
      [OP_READ] = {
            .op_func = (nfsd4op_func)nfsd4_read,
      },
      [OP_READDIR] = {
            .op_func = (nfsd4op_func)nfsd4_readdir,
      },
      [OP_READLINK] = {
            .op_func = (nfsd4op_func)nfsd4_readlink,
      },
      [OP_REMOVE] = {
            .op_func = (nfsd4op_func)nfsd4_remove,
      },
      [OP_RENAME] = {
            .op_func = (nfsd4op_func)nfsd4_rename,
      },
      [OP_RENEW] = {
            .op_func = (nfsd4op_func)nfsd4_renew,
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
      [OP_RESTOREFH] = {
            .op_func = (nfsd4op_func)nfsd4_restorefh,
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
      [OP_SAVEFH] = {
            .op_func = (nfsd4op_func)nfsd4_savefh,
      },
      [OP_SECINFO] = {
            .op_func = (nfsd4op_func)nfsd4_secinfo,
      },
      [OP_SETATTR] = {
            .op_func = (nfsd4op_func)nfsd4_setattr,
      },
      [OP_SETCLIENTID] = {
            .op_func = (nfsd4op_func)nfsd4_setclientid,
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
      [OP_SETCLIENTID_CONFIRM] = {
            .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
      [OP_VERIFY] = {
            .op_func = (nfsd4op_func)nfsd4_verify,
      },
      [OP_WRITE] = {
            .op_func = (nfsd4op_func)nfsd4_write,
      },
      [OP_RELEASE_LOCKOWNER] = {
            .op_func = (nfsd4op_func)nfsd4_release_lockowner,
            .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
      },
};

#define nfs4svc_decode_voidargs           NULL
#define nfs4svc_release_void        NULL
#define nfsd4_voidres               nfsd4_voidargs
#define nfs4svc_release_compound    NULL
struct nfsd4_voidargs { int dummy; };

#define PROC(name, argt, rest, relt, cache, respsize) \
 { (svc_procfunc) nfsd4_proc_##name,            \
   (kxdrproc_t) nfs4svc_decode_##argt##args,    \
   (kxdrproc_t) nfs4svc_encode_##rest##res,     \
   (kxdrproc_t) nfs4svc_release_##relt,         \
   sizeof(struct nfsd4_##argt##args),           \
   sizeof(struct nfsd4_##rest##res),            \
   0,                               \
   cache,                           \
   respsize,                              \
 }

/*
 * TODO: At the present time, the NFSv4 server does not do XID caching
 * of requests.  Implementing XID caching would not be a serious problem,
 * although it would require a mild change in interfaces since one
 * doesn't know whether an NFSv4 request is idempotent until after the
 * XDR decode.  However, XID caching totally confuses pynfs (Peter
 * Astrand's regression testsuite for NFSv4 servers), which reuses
 * XID's liberally, so I've left it unimplemented until pynfs generates
 * better XID's.
 */
static struct svc_procedure         nfsd_procedures4[2] = {
  PROC(null,       void,            void,       void,   RC_NOCACHE, 1),
  PROC(compound, compound,    compound,   compound, RC_NOCACHE, NFSD_BUFSIZE/4)
};

struct svc_version      nfsd_version4 = {
            .vs_vers    = 4,
            .vs_nproc   = 2,
            .vs_proc    = nfsd_procedures4,
            .vs_dispatch      = nfsd_dispatch,
            .vs_xdrsize = NFS4_SVC_XDRSIZE,
};

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */

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