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ufs_vfsops.c

/*    $OpenBSD: ufs_vfsops.c,v 1.11 2003/12/28 17:20:16 tedu Exp $      */
/*    $NetBSD: ufs_vfsops.c,v 1.4 1996/02/09 22:36:12 christos Exp $    */

/*
 * Copyright (c) 1991, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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 BY THE REGENTS AND CONTRIBUTORS ``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.
 *
 *    @(#)ufs_vfsops.c  8.4 (Berkeley) 4/16/94
 */

#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/malloc.h>

#include <miscfs/specfs/specdev.h>

#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dir.h>
#include <ufs/ufs/dirhash.h>
#endif

/*
 * Make a filesystem operational.
 * Nothing to do at the moment.
 */
/* ARGSUSED */
int
ufs_start(mp, flags, p)
      struct mount *mp;
      int flags;
      struct proc *p;
{

      return (0);
}

/*
 * Return the root of a filesystem.
 */
int
ufs_root(mp, vpp)
      struct mount *mp;
      struct vnode **vpp;
{
      struct vnode *nvp;
      int error;

      if ((error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp)) != 0)
            return (error);
      *vpp = nvp;
      return (0);
}

/*
 * Verify a remote client has export rights and return these rights via.
 * exflagsp and credanonp.
 */
int
ufs_check_export(mp, nam, exflagsp, credanonp)
      register struct mount *mp;
      struct mbuf *nam;
      int *exflagsp;
      struct ucred **credanonp;
{
      register struct netcred *np;
      register struct ufsmount *ump = VFSTOUFS(mp);

      /*
       * Get the export permission structure for this <mp, client> tuple.
       */
      np = vfs_export_lookup(mp, &ump->um_export, nam);
      if (np == NULL)
            return (EACCES);

      *exflagsp = np->netc_exflags;
      *credanonp = &np->netc_anon;
      return (0);
}

/*
 * Initial UFS filesystems, done only once.
 */
int
ufs_init(vfsp)
      struct vfsconf *vfsp;
{
      static int done;

      if (done)
            return (0);
      done = 1;
      ufs_ihashinit();
      ufs_quota_init();
#ifdef UFS_DIRHASH
      ufsdirhash_init();
#endif

      return (0);
}

/*
 * This is the generic part of fhtovp called after the underlying
 * filesystem has validated the file handle.
 */
int
ufs_fhtovp(mp, ufhp, vpp)
      register struct mount *mp;
      struct ufid *ufhp;
      struct vnode **vpp;
{
      register struct inode *ip;
      struct vnode *nvp;
      int error;

      if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
            *vpp = NULLVP;
            return (error);
      }
      ip = VTOI(nvp);
      if (ip->i_ffs_mode == 0 || ip->i_ffs_gen != ufhp->ufid_gen) {
            vput(nvp);
            *vpp = NULLVP;
            return (ESTALE);
      }
      *vpp = nvp;
      return (0);
}

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