sbin/badsect/badsect.c

   1 /*
   2  * Copyright (c) 1981, 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1981, 1983, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)badsect.c        8.1 (Berkeley) 6/5/93
  31  * $FreeBSD: src/sbin/badsect/badsect.c,v 1.7.2.2 2001/07/30 10:30:04 dd Exp $
  32  * $DragonFly: src/sbin/badsect/badsect.c,v 1.11 2006/04/03 01:58:46 dillon Exp $
  33  */
  34
  35 /*
  36  * badsect
  37  *
  38  * Badsect takes a list of file-system relative sector numbers
  39  * and makes files containing the blocks of which these sectors are a part.
  40  * It can be used to contain sectors which have problems if these sectors
  41  * are not part of the bad file for the pack (see bad144).  For instance,
  42  * this program can be used if the driver for the file system in question
  43  * does not support bad block forwarding.
  44  */
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47
  48 #include <vfs/ufs/dinode.h>
  49 #include <vfs/ufs/fs.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <dirent.h>
  54 #include <fcntl.h>
  55 #include <paths.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60
  61 struct fs       sblock, *fs;
  62 struct cg       acg;
  63 int             fso, fsi;
  64 int             errs;
  65 long            dev_bsize = 1;
  66
  67 char            buf[MAXBSIZE];
  68
  69 static void     rdfs(daddr_t, int, char *);
  70 static int      chkuse(daddr_t, int);
  71 static void     usage(void);
  72
  73 static void
  74 usage(void)
  75 {
  76         fprintf(stderr, "usage: badsect bbdir blkno ...\n");
  77         exit(1);
  78 }
  79
  80 int
  81 main(int argc, char **argv)
  82 {
  83         daddr_t diskbn;
  84         daddr_t number;
  85         dev_t dev;
  86         struct stat stbuf, devstat;
  87         struct dirent *dp;
  88         DIR *dirp;
  89         char name[2 * MAXPATHLEN];
  90
  91         if (argc < 3)
  92                 usage();
  93         if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0)
  94                 err(2, "%s", argv[1]);
  95         if (strlcpy(name, _PATH_DEV, sizeof(name)) >= sizeof(name)) {
  96                 errno = ENAMETOOLONG;
  97                 err(1, "cannot build path name");
  98         }
  99         if ((dirp = opendir(name)) == NULL)
 100                 err(3, "%s", name);
 101         while ((dp = readdir(dirp)) != NULL) {
 102                 strlcpy(name, _PATH_DEV, sizeof(name));
 103                 if (strlcat(name, dp->d_name, sizeof(name)) >= sizeof(name)) {
 104                         errno = ENAMETOOLONG;
 105                         err(1, "cannot build path name");
 106                 }
 107                 if (lstat(name, &devstat) < 0)
 108                         err(4, "%s", name);
 109                 if (stbuf.st_dev == devstat.st_rdev &&
 110                     (devstat.st_mode & IFMT) == IFCHR)
 111                         break;
 112         }
 113         closedir(dirp);
 114         if (dp == NULL) {
 115                 printf("Cannot find dev 0%lo corresponding to %s\n",
 116                     (u_long)stbuf.st_rdev, argv[1]);
 117                 exit(5);
 118         }
 119         if ((fsi = open(name, O_RDONLY)) < 0)
 120                 err(6, "%s", name);
 121         fs = &sblock;
 122         rdfs(SBOFF, SBSIZE, (char *)fs);
 123         dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
 124         for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
 125                 number = atol(*argv);
 126                 if (chkuse(number, 1))
 127                         continue;
 128                 /*
 129                  * Print a warning if converting the block number to a dev_t
 130                  * will truncate it.  badsect was not very useful in versions
 131                  * of BSD before 4.4 because dev_t was 16 bits and another
 132                  * bit was lost by bogus sign extensions.
 133                  */
 134                 diskbn = dbtofsb(fs, number);
 135                 dev = (dev_t)diskbn;
 136                 if ((daddr_t)dev != diskbn) {
 137                         printf("sector %ld cannot be represented as a dev_t\n",
 138                             (long)number);
 139                         errs++;
 140                 } else if (mknod(*argv, IFMT | 0600, dev) < 0) {
 141                         warn("%s", *argv);
 142                         errs++;
 143                 }
 144         }
 145         printf("Don't forget to run ``fsck %s''\n", name);
 146         exit(errs);
 147 }
 148
 149 static int
 150 chkuse(daddr_t blkno, int cnt)
 151 {
 152         int cg;
 153         daddr_t fsbn, bn;
 154
 155         fsbn = dbtofsb(fs, blkno);
 156         if (fs->fs_size < 0 || fsbn + cnt < 0) {
 157                 printf("internal error: negative fs size or block number\n");
 158                 return (1);
 159         }
 160         if (fsbn + cnt > fs->fs_size) {
 161                 printf("block %ld out of range of file system\n", (long)blkno);
 162                 return (1);
 163         }
 164         cg = dtog(fs, fsbn);
 165         if (fsbn < cgdmin(fs, cg)) {
 166                 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
 167                         printf("block %ld in non-data area: cannot attach\n",
 168                             (long)blkno);
 169                         return (1);
 170                 }
 171         } else {
 172                 if ((fsbn+cnt) > cgbase(fs, cg+1)) {
 173                         printf("block %ld in non-data area: cannot attach\n",
 174                             (long)blkno);
 175                         return (1);
 176                 }
 177         }
 178         rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
 179             (char *)&acg);
 180         if (!cg_chkmagic(&acg)) {
 181                 fprintf(stderr, "cg %d: bad magic number\n", cg);
 182                 errs++;
 183                 return (1);
 184         }
 185         bn = dtogd(fs, fsbn);
 186         if (isclr(cg_blksfree(&acg), bn))
 187                 printf("Warning: sector %ld is in use\n", (long)blkno);
 188         return (0);
 189 }
 190
 191 /*
 192  * read a block from the file system
 193  */
 194 static void
 195 rdfs(daddr_t bno, int size, char *bf)
 196 {
 197         int n;
 198
 199         if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) {
 200                 printf("seek error: %ld\n", (long)bno);
 201                 err(1, "rdfs");
 202         }
 203         n = read(fsi, bf, size);
 204         if (n != size) {
 205                 printf("read error: %ld\n", (long)bno);
 206                 err(1, "rdfs");
 207         }
 208 }