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badsect.c

/*
 * Copyright (c) 1981, 1983, 1993
 *    The Regents of the University of California.  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.
 * 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.
 */

#if 0
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1981, 1983, 1993\n\
      The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static const char sccsid[] = "@(#)badsect.c     8.1 (Berkeley) 6/5/93";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sbin/badsect/badsect.c,v 1.21 2005/01/03 19:03:40 rwatson Exp $");

/*
 * badsect
 *
 * Badsect takes a list of file-system relative sector numbers
 * and makes files containing the blocks of which these sectors are a part.
 * It can be used to contain sectors which have problems if these sectors
 * are not part of the bad file for the pack (see bad144).  For instance,
 * this program can be used if the driver for the file system in question
 * does not support bad block forwarding.
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/disklabel.h>

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

#include <err.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <libufs.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define sblock    disk.d_fs
#define     acg   disk.d_cg
struct      uufsd disk;
struct      fs *fs = &sblock;
int   errs;

int   chkuse(daddr_t, int);

static void
usage(void)
{
      fprintf(stderr, "usage: badsect bbdir blkno ...\n");
      exit(1);
}

int
main(int argc, char *argv[])
{
      daddr_t diskbn;
      daddr_t number;
      struct stat stbuf, devstat;
      struct dirent *dp;
      DIR *dirp;
      char name[2 * MAXPATHLEN];
      char *name_dir_end;

      if (argc < 3)
            usage();
      if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0)
            err(2, "%s", argv[1]);
      strcpy(name, _PATH_DEV);
      if ((dirp = opendir(name)) == NULL)
            err(3, "%s", name);
      name_dir_end = name + strlen(name);
      while ((dp = readdir(dirp)) != NULL) {
            strcpy(name_dir_end, dp->d_name);
            if (lstat(name, &devstat) < 0)
                  err(4, "%s", name);
            if (stbuf.st_dev == devstat.st_rdev &&
                (devstat.st_mode & IFMT) == IFCHR)
                  break;
      }
      closedir(dirp);
      if (dp == NULL) {
            printf("Cannot find dev 0%lo corresponding to %s\n",
                (u_long)stbuf.st_rdev, argv[1]);
            exit(5);
      }
      if (ufs_disk_fillout(&disk, name) == -1) {
            if (disk.d_error != NULL)
                  errx(6, "%s: %s", name, disk.d_error);
            else
                  err(7, "%s", name);
      }
      for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
            number = strtol(*argv, NULL, 0);
            if (errno == EINVAL || errno == ERANGE)
                  err(8, "%s", *argv);
            if (chkuse(number, 1))
                  continue;
            /*
             * Print a warning if converting the block number to a dev_t
             * will truncate it.  badsect was not very useful in versions
             * of BSD before 4.4 because dev_t was 16 bits and another
             * bit was lost by bogus sign extensions.
             */
            diskbn = dbtofsb(fs, number);
            if ((dev_t)diskbn != diskbn) {
                  printf("sector %ld cannot be represented as a dev_t\n",
                      (long)number);
                  errs++;
            }
            else if (mknod(*argv, IFMT|0600, (dev_t)diskbn) < 0) {
                  warn("%s", *argv);
                  errs++;
            }
      }
      ufs_disk_close(&disk);
      printf("Don't forget to run ``fsck %s''\n", name);
      exit(errs);
}

int
chkuse(daddr_t blkno, int cnt)
{
      int cg;
      daddr_t fsbn, bn;

      fsbn = dbtofsb(fs, blkno);
      if ((unsigned)(fsbn+cnt) > fs->fs_size) {
            printf("block %ld out of range of file system\n", (long)blkno);
            return (1);
      }
      cg = dtog(fs, fsbn);
      if (fsbn < cgdmin(fs, cg)) {
            if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
                  printf("block %ld in non-data area: cannot attach\n",
                      (long)blkno);
                  return (1);
            }
      } else {
            if ((fsbn+cnt) > cgbase(fs, cg+1)) {
                  printf("block %ld in non-data area: cannot attach\n",
                      (long)blkno);
                  return (1);
            }
      }
      if (cgread1(&disk, cg) != 1) {
            fprintf(stderr, "cg %d: could not be read\n", cg);
            errs++;
            return (1);
      }
      if (!cg_chkmagic(&acg)) {
            fprintf(stderr, "cg %d: bad magic number\n", cg);
            errs++;
            return (1);
      }
      bn = dtogd(fs, fsbn);
      if (isclr(cg_blksfree(&acg), bn))
            printf("Warning: sector %ld is in use\n", (long)blkno);
      return (0);
}

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