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ufs_vfsops.c

/*-
 * 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.
 * 4. 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  8.8 (Berkeley) 5/20/95
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/ufs/ufs/ufs_vfsops.c,v 1.48 2007/02/01 02:13:53 mpp Exp $");

#include "opt_quota.h"
#include "opt_ufs.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/vnode.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

MALLOC_DEFINE(M_UFSMNT, "ufs_mount", "UFS mount structure");

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

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

/*
 * Do operations associated with quotas
 */
int
ufs_quotactl(mp, cmds, id, arg, td)
      struct mount *mp;
      int cmds;
      uid_t id;
      void *arg;
      struct thread *td;
{
#ifndef QUOTA
      return (EOPNOTSUPP);
#else
      int cmd, type, error;

      cmd = cmds >> SUBCMDSHIFT;
      type = cmds & SUBCMDMASK;
      if (id == -1) {
            switch (type) {

            case USRQUOTA:
                  id = td->td_ucred->cr_ruid;
                  break;

            case GRPQUOTA:
                  id = td->td_ucred->cr_rgid;
                  break;

            default:
                  return (EINVAL);
            }
      }
      if ((u_int)type >= MAXQUOTAS)
            return (EINVAL);

      if (vfs_busy(mp, LK_NOWAIT, 0, td))
            return (0);

      switch (cmd) {
      case Q_QUOTAON:
            error = quotaon(td, mp, type, arg);
            break;

      case Q_QUOTAOFF:
            error = quotaoff(td, mp, type);
            break;

      case Q_SETQUOTA:
            error = setquota(td, mp, id, type, arg);
            break;

      case Q_SETUSE:
            error = setuse(td, mp, id, type, arg);
            break;

      case Q_GETQUOTA:
            error = getquota(td, mp, id, type, arg);
            break;

      case Q_SYNC:
            error = qsync(mp);
            break;

      default:
            error = EINVAL;
            break;
      }
      vfs_unbusy(mp, td);
      return (error);
#endif
}

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

#ifdef QUOTA
      dqinit();
#endif
#ifdef UFS_DIRHASH
      ufsdirhash_init();
#endif
      return (0);
}

/*
 * Uninitialise UFS filesystems, done before module unload.
 */
int
ufs_uninit(vfsp)
      struct vfsconf *vfsp;
{

#ifdef QUOTA
      dquninit();
#endif
#ifdef UFS_DIRHASH
      ufsdirhash_uninit();
#endif
      return (0);
}

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

      error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
      if (error) {
            *vpp = NULLVP;
            return (error);
      }
      ip = VTOI(nvp);
      if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
          ip->i_effnlink <= 0) {
            vput(nvp);
            *vpp = NULLVP;
            return (ESTALE);
      }
      *vpp = nvp;
      vnode_create_vobject(*vpp, DIP(ip, i_size), curthread);
      return (0);
}

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