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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1981, 1983, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)badsect.c        8.1 (Berkeley) 6/5/93
  35  * $FreeBSD: src/sbin/badsect/badsect.c,v 1.7.2.2 2001/07/30 10:30:04 dd Exp $
  36  * $DragonFly: src/sbin/badsect/badsect.c,v 1.11 2006/04/03 01:58:46 dillon Exp $
  37  */
  38
  39 /*
  40  * badsect
  41  *
  42  * Badsect takes a list of file-system relative sector numbers
  43  * and makes files containing the blocks of which these sectors are a part.
  44  * It can be used to contain sectors which have problems if these sectors
  45  * are not part of the bad file for the pack (see bad144).  For instance,
  46  * this program can be used if the driver for the file system in question
  47  * does not support bad block forwarding.
  48  */
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51
  52 #include <vfs/ufs/dinode.h>
  53 #include <vfs/ufs/fs.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <dirent.h>
  58 #include <fcntl.h>
  59 #include <paths.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 struct fs       sblock, *fs;
  66 struct cg       acg;
  67 int             fso, fsi;
  68 int             errs;
  69 long            dev_bsize = 1;
  70
  71 char            buf[MAXBSIZE];
  72
  73 static void     rdfs(daddr_t, int, char *);
  74 static int      chkuse(daddr_t, int);
  75 static void     usage(void);
  76
  77 static void
  78 usage(void)
  79 {
  80         fprintf(stderr, "usage: badsect bbdir blkno ...\n");
  81         exit(1);
  82 }
  83
  84 int
  85 main(int argc, char **argv)
  86 {
  87         daddr_t diskbn;
  88         daddr_t number;
  89         dev_t dev;
  90         struct stat stbuf, devstat;
  91         struct dirent *dp;
  92         DIR *dirp;
  93         char name[2 * MAXPATHLEN];
  94
  95         if (argc < 3)
  96                 usage();
  97         if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0)
  98                 err(2, "%s", argv[1]);
  99         if (strlcpy(name, _PATH_DEV, sizeof(name)) >= sizeof(name)) {
 100                 errno = ENAMETOOLONG;
 101                 err(1, "cannot build path name");
 102         }
 103         if ((dirp = opendir(name)) == NULL)
 104                 err(3, "%s", name);
 105         while ((dp = readdir(dirp)) != NULL) {
 106                 strlcpy(name, _PATH_DEV, sizeof(name));
 107                 if (strlcat(name, dp->d_name, sizeof(name)) >= sizeof(name)) {
 108                         errno = ENAMETOOLONG;
 109                         err(1, "cannot build path name");
 110                 }
 111                 if (lstat(name, &devstat) < 0)
 112                         err(4, "%s", name);
 113                 if (stbuf.st_dev == devstat.st_rdev &&
 114                     (devstat.st_mode & IFMT) == IFCHR)
 115                         break;
 116         }
 117         closedir(dirp);
 118         if (dp == NULL) {
 119                 printf("Cannot find dev 0%lo corresponding to %s\n",
 120                     (u_long)stbuf.st_rdev, argv[1]);
 121                 exit(5);
 122         }
 123         if ((fsi = open(name, O_RDONLY)) < 0)
 124                 err(6, "%s", name);
 125         fs = &sblock;
 126         rdfs(SBOFF, SBSIZE, (char *)fs);
 127         dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
 128         for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
 129                 number = atol(*argv);
 130                 if (chkuse(number, 1))
 131                         continue;
 132                 /*
 133                  * Print a warning if converting the block number to a dev_t
 134                  * will truncate it.  badsect was not very useful in versions
 135                  * of BSD before 4.4 because dev_t was 16 bits and another
 136                  * bit was lost by bogus sign extensions.
 137                  */
 138                 diskbn = dbtofsb(fs, number);
 139                 dev = (dev_t)diskbn;
 140                 if ((daddr_t)dev != diskbn) {
 141                         printf("sector %ld cannot be represented as a dev_t\n",
 142                             (long)number);
 143                         errs++;
 144                 } else if (mknod(*argv, IFMT | 0600, dev) < 0) {
 145                         warn("%s", *argv);
 146                         errs++;
 147                 }
 148         }
 149         printf("Don't forget to run ``fsck %s''\n", name);
 150         exit(errs);
 151 }
 152
 153 static int
 154 chkuse(daddr_t blkno, int cnt)
 155 {
 156         int cg;
 157         daddr_t fsbn, bn;
 158
 159         fsbn = dbtofsb(fs, blkno);
 160         if (fs->fs_size < 0 || fsbn + cnt < 0) {
 161                 printf("internal error: negative fs size or block number\n");
 162                 return (1);
 163         }
 164         if (fsbn + cnt > fs->fs_size) {
 165                 printf("block %ld out of range of file system\n", (long)blkno);
 166                 return (1);
 167         }
 168         cg = dtog(fs, fsbn);
 169         if (fsbn < cgdmin(fs, cg)) {
 170                 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
 171                         printf("block %ld in non-data area: cannot attach\n",
 172                             (long)blkno);
 173                         return (1);
 174                 }
 175         } else {
 176                 if ((fsbn+cnt) > cgbase(fs, cg+1)) {
 177                         printf("block %ld in non-data area: cannot attach\n",
 178                             (long)blkno);
 179                         return (1);
 180                 }
 181         }
 182         rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
 183             (char *)&acg);
 184         if (!cg_chkmagic(&acg)) {
 185                 fprintf(stderr, "cg %d: bad magic number\n", cg);
 186                 errs++;
 187                 return (1);
 188         }
 189         bn = dtogd(fs, fsbn);
 190         if (isclr(cg_blksfree(&acg), bn))
 191                 printf("Warning: sector %ld is in use\n", (long)blkno);
 192         return (0);
 193 }
 194
 195 /*
 196  * read a block from the file system
 197  */
 198 static void
 199 rdfs(daddr_t bno, int size, char *bf)
 200 {
 201         int n;
 202
 203         if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) {
 204                 printf("seek error: %ld\n", (long)bno);
 205                 err(1, "rdfs");
 206         }
 207         n = read(fsi, bf, size);
 208         if (n != size) {
 209                 printf("read error: %ld\n", (long)bno);
 210                 err(1, "rdfs");
 211         }
 212 }