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inode.c

/*
 * Copyright (c) 2002 Juli Mallett.  All rights reserved.
 *
 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
 * FreeBSD project.  Redistribution and use in source and binary forms, with
 * or without modification, are permitted provided that the following
 * conditions are met:
 *
 * 1. Redistribution of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistribution 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 AUTHOR ``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 AUTHOR 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: src/lib/libufs/inode.c,v 1.6 2003/06/19 22:12:54 mdodd Exp $");

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/disklabel.h>
#include <sys/stat.h>

#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <libufs.h>

int
getino(struct uufsd *disk, void **dino, ino_t inode, int *mode)
{
      ino_t min, max;
      caddr_t inoblock;
      struct ufs1_dinode *dp1;
      struct ufs2_dinode *dp2;
      struct fs *fs;

      ERROR(disk, NULL);

      fs = &disk->d_fs;
      inoblock = disk->d_inoblock;
      min = disk->d_inomin;
      max = disk->d_inomax;

      if (inoblock == NULL) {
            inoblock = malloc(fs->fs_bsize);
            if (inoblock == NULL) {
                  ERROR(disk, "unable to allocate inode block");
                  return (-1);
            }
            disk->d_inoblock = inoblock;
      }
      if (inode >= min && inode < max)
            goto gotit;
      bread(disk, fsbtodb(fs, ino_to_fsba(fs, inode)), inoblock,
          fs->fs_bsize);
      disk->d_inomin = min = inode - (inode % INOPB(fs));
      disk->d_inomax = max = min + INOPB(fs);
gotit:      switch (disk->d_ufs) {
      case 1:
            dp1 = &((struct ufs1_dinode *)inoblock)[inode - min];
            *mode = dp1->di_mode & IFMT;
            *dino = dp1;
            return (0);
      case 2:
            dp2 = &((struct ufs2_dinode *)inoblock)[inode - min];
            *mode = dp2->di_mode & IFMT;
            *dino = dp2;
            return (0);
      default:
            break;
      }
      ERROR(disk, "unknown UFS filesystem type");
      return (-1);
}

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