text: /*-
   * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   * All rights reserved.
   *
   * 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.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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 <sys/cdefs.h>
  __FBSDID("$FreeBSD: releng/11.0/sbin/geom/class/journal/geom_journal_ufs.c 245074 2013-01-05 21:52:38Z kib $");
  
  #include <sys/param.h>
  #include <sys/disklabel.h>
  #include <sys/mount.h>
  
  #include <ufs/ufs/dinode.h>
  #include <ufs/ffs/fs.h>
  
  #include <libufs.h>
  #include <libgeom.h>
  #include <core/geom.h>
  #include <misc/subr.h>
  
  #include "geom_journal.h"
  
  static struct fs *
  read_superblock(const char *prov)
  {
  	static struct uufsd disk;
  	struct fs *fs;
  
  	if (ufs_disk_fillout(&disk, prov) == -1)
  		return (NULL);
  	fs = &disk.d_fs;
  	ufs_disk_close(&disk);
  	return (fs);
  }
  
  int
  g_journal_ufs_exists(const char *prov)
  {
  
  	return (read_superblock(prov) != NULL);
  }
  
  int
  g_journal_ufs_using_last_sector(const char *prov)
  {
  	struct fs *fs;
  	off_t psize, fssize;
  
  	fs = read_superblock(prov);
  	if (fs == NULL)
  		return (0);
  	/* Provider size in 512 bytes blocks. */
  	psize = g_get_mediasize(prov) / DEV_BSIZE;
  	/* File system size in 512 bytes blocks. */
  	fssize = fsbtodb(fs, fs->fs_size);
  	return (psize <= fssize);
  }
  