1 /* $NetBSD: badsect.c,v 1.20 2001/08/17 02:18:46 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1981, 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1981, 1983, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)badsect.c 8.2 (Berkeley) 5/4/95"; 45 #else 46 __RCSID("$NetBSD: badsect.c,v 1.20 2001/08/17 02:18:46 lukem Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * badsect 52 * 53 * Badsect takes a list of file-system relative sector numbers 54 * and makes files containing the blocks of which these sectors are a part. 55 * It can be used to contain sectors which have problems if these sectors 56 * are not part of the bad file for the pack (see bad144). For instance, 57 * this program can be used if the driver for the file system in question 58 * does not support bad block forwarding. 59 */ 60 #include <sys/param.h> 61 #include <sys/dir.h> 62 #include <sys/stat.h> 63 64 #include <ufs/ufs/dinode.h> 65 #include <ufs/ufs/ufs_bswap.h> 66 #include <ufs/ffs/fs.h> 67 #include <ufs/ffs/ffs_extern.h> 68 69 #include <fcntl.h> 70 #include <paths.h> 71 #include <stdio.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <unistd.h> 75 #include <err.h> 76 77 union { 78 struct fs fs; 79 char fsx[SBSIZE]; 80 } ufs; 81 #define sblock ufs.fs 82 union { 83 struct cg cg; 84 char cgx[MAXBSIZE]; 85 } ucg; 86 #define acg ucg.cg 87 struct fs *fs; 88 int fso, fsi; 89 int errs; 90 long dev_bsize = 1; 91 int needswap = 0; 92 93 char buf[MAXBSIZE]; 94 95 void rdfs __P((daddr_t, int, char *)); 96 int chkuse __P((daddr_t, int)); 97 int main __P((int, char *[])); 98 99 int 100 main(argc, argv) 101 int argc; 102 char *argv[]; 103 { 104 daddr_t number; 105 struct stat stbuf, devstat; 106 struct direct *dp; 107 DIR *dirp; 108 char name[MAXPATHLEN]; 109 110 if (argc < 3) { 111 (void) fprintf(stderr, "Usage: %s bbdir blkno [ blkno ]\n", 112 getprogname()); 113 exit(1); 114 } 115 if (chdir(argv[1]) == -1) 116 err(1, "Cannot change directory to `%s'", argv[1]); 117 118 if (stat(".", &stbuf) == -1) 119 err(1, "Cannot stat `%s'", argv[1]); 120 121 (void) strcpy(name, _PATH_DEV); 122 if ((dirp = opendir(name)) == NULL) 123 err(1, "Cannot opendir `%s'", argv[1]); 124 125 while ((dp = readdir(dirp)) != NULL) { 126 (void) snprintf(name, sizeof(name), "%s%s", _PATH_DEV, 127 dp->d_name); 128 if (stat(name, &devstat) == -1) 129 err(1, "Cannot stat `%s'", name); 130 if (stbuf.st_dev == devstat.st_rdev && 131 S_ISBLK(devstat.st_mode)) 132 break; 133 } 134 if (dp == NULL) { 135 closedir(dirp); 136 errx(1, "Cannot find dev 0%o corresponding to %s", 137 stbuf.st_rdev, argv[1]); 138 } 139 140 /* 141 * The filesystem is mounted; use the character device instead. 142 * XXX - Assume that prepending an `r' will give us the name of 143 * the character device. 144 */ 145 (void) snprintf(name, sizeof(name), "%sr%s", _PATH_DEV, dp->d_name); 146 147 closedir(dirp); /* now *dp is invalid */ 148 149 if ((fsi = open(name, O_RDONLY)) == -1) 150 err(1, "Cannot open `%s'", argv[1]); 151 152 fs = &sblock; 153 rdfs(SBOFF, SBSIZE, (char *)fs); 154 if (fs->fs_magic != FS_MAGIC) { 155 if(fs->fs_magic == bswap32(FS_MAGIC)) 156 needswap = 1; 157 else 158 errx(1, "%s: bad superblock", name); 159 } 160 if (needswap) 161 ffs_sb_swap(fs, fs); 162 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 163 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 164 number = atoi(*argv); 165 if (chkuse(number, 1)) 166 continue; 167 if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR, 168 dbtofsb(fs, number)) == -1) { 169 warn("Cannot mknod `%s'", *argv); 170 errs++; 171 } 172 } 173 174 warnx("Don't forget to run ``fsck %s''", name); 175 return errs; 176 } 177 178 int 179 chkuse(blkno, cnt) 180 daddr_t blkno; 181 int cnt; 182 { 183 int cg; 184 daddr_t fsbn, bn; 185 186 fsbn = dbtofsb(fs, blkno); 187 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 188 warnx("block %d out of range of file system", blkno); 189 return (1); 190 } 191 192 cg = dtog(fs, fsbn); 193 if (fsbn < cgdmin(fs, cg)) { 194 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 195 warnx("block %d in non-data area: cannot attach", 196 blkno); 197 return (1); 198 } 199 } else { 200 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 201 warnx("block %d in non-data area: cannot attach", 202 blkno); 203 return (1); 204 } 205 } 206 207 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 208 (char *)&acg); 209 210 if (!cg_chkmagic(&acg, needswap)) { 211 warnx("cg %d: bad magic number", cg); 212 errs++; 213 return (1); 214 } 215 216 bn = dtogd(fs, fsbn); 217 if (isclr(cg_blksfree(&acg, needswap), bn)) 218 warnx("Warning: sector %d is in use", blkno); 219 220 return (0); 221 } 222 223 /* 224 * read a block from the file system 225 */ 226 void 227 rdfs(bno, size, bf) 228 daddr_t bno; 229 int size; 230 char *bf; 231 { 232 int n; 233 234 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) == -1) 235 err(1, "seek error at block %d", bno); 236 237 switch (n = read(fsi, bf, size)) { 238 case -1: 239 err(1, "read error at block %d", bno); 240 break; 241 242 default: 243 if (n == size) 244 return; 245 errx(1, "incomplete read at block %d", bno); 246 } 247 } 248