1 /* $NetBSD: badsect.c,v 1.22 2003/04/02 10:39:22 fvdl 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 1.22 2003/04/02 10:39:22 fvdl 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[SBLOCKSIZE]; 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 int is_ufs2; 93 94 char buf[MAXBSIZE]; 95 96 void rdfs __P((daddr_t, int, char *)); 97 int chkuse __P((daddr_t, int)); 98 int main __P((int, char *[])); 99 100 const off_t sblock_try[] = SBLOCKSEARCH; 101 102 int 103 main(argc, argv) 104 int argc; 105 char *argv[]; 106 { 107 daddr_t number; 108 struct stat stbuf, devstat; 109 struct direct *dp; 110 int i; 111 DIR *dirp; 112 char name[MAXPATHLEN]; 113 114 if (argc < 3) { 115 (void) fprintf(stderr, "Usage: %s bbdir blkno [ blkno ]\n", 116 getprogname()); 117 exit(1); 118 } 119 if (chdir(argv[1]) == -1) 120 err(1, "Cannot change directory to `%s'", argv[1]); 121 122 if (stat(".", &stbuf) == -1) 123 err(1, "Cannot stat `%s'", argv[1]); 124 125 (void) strcpy(name, _PATH_DEV); 126 if ((dirp = opendir(name)) == NULL) 127 err(1, "Cannot opendir `%s'", argv[1]); 128 129 while ((dp = readdir(dirp)) != NULL) { 130 (void) snprintf(name, sizeof(name), "%s%s", _PATH_DEV, 131 dp->d_name); 132 if (stat(name, &devstat) == -1) 133 err(1, "Cannot stat `%s'", name); 134 if (stbuf.st_dev == devstat.st_rdev && 135 S_ISBLK(devstat.st_mode)) 136 break; 137 } 138 if (dp == NULL) { 139 closedir(dirp); 140 errx(1, "Cannot find dev 0%o corresponding to %s", 141 stbuf.st_rdev, argv[1]); 142 } 143 144 /* 145 * The filesystem is mounted; use the character device instead. 146 * XXX - Assume that prepending an `r' will give us the name of 147 * the character device. 148 */ 149 (void) snprintf(name, sizeof(name), "%sr%s", _PATH_DEV, dp->d_name); 150 151 closedir(dirp); /* now *dp is invalid */ 152 153 if ((fsi = open(name, O_RDONLY)) == -1) 154 err(1, "Cannot open `%s'", argv[1]); 155 156 fs = &sblock; 157 158 for (i = 0; sblock_try[i] != -1; i++) { 159 rdfs(sblock_try[i] / DEV_BSIZE, SBLOCKSIZE, (char *)fs); 160 switch (fs->fs_magic) { 161 case FS_UFS2_MAGIC: 162 is_ufs2 = 1; 163 /* FALLTHROUGH */ 164 case FS_UFS1_MAGIC: 165 goto found; 166 case FS_UFS2_MAGIC_SWAPPED: 167 is_ufs2 = 1; 168 /* FALLTHROUGH */ 169 case FS_UFS1_MAGIC_SWAPPED: 170 needswap = 1; 171 goto found; 172 default: 173 continue; 174 } 175 } 176 errx(1, "%s: bad superblock", name); 177 found: 178 if (needswap) 179 ffs_sb_swap(fs, fs); 180 181 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 182 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 183 number = atoi(*argv); 184 if (chkuse(number, 1)) 185 continue; 186 if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR, 187 dbtofsb(fs, number)) == -1) { 188 warn("Cannot mknod `%s'", *argv); 189 errs++; 190 } 191 } 192 193 warnx("Don't forget to run ``fsck %s''", name); 194 return errs; 195 } 196 197 int 198 chkuse(blkno, cnt) 199 daddr_t blkno; 200 int cnt; 201 { 202 int cg; 203 daddr_t fsbn, bn; 204 205 fsbn = dbtofsb(fs, blkno); 206 if (fsbn+cnt > fs->fs_size) { 207 warnx("block %lld out of range of file system", 208 (long long)blkno); 209 return (1); 210 } 211 212 cg = dtog(fs, fsbn); 213 if (fsbn < cgdmin(fs, cg)) { 214 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 215 warnx("block %lld in non-data area: cannot attach", 216 (long long)blkno); 217 return (1); 218 } 219 } else { 220 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 221 warnx("block %lld in non-data area: cannot attach", 222 (long long)blkno); 223 return (1); 224 } 225 } 226 227 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 228 (char *)&acg); 229 230 if (!cg_chkmagic(&acg, needswap)) { 231 warnx("cg %d: bad magic number", cg); 232 errs++; 233 return (1); 234 } 235 236 bn = dtogd(fs, fsbn); 237 if (isclr(cg_blksfree(&acg, needswap), bn)) 238 warnx("Warning: sector %lld is in use", (long long)blkno); 239 240 return (0); 241 } 242 243 /* 244 * read a block from the file system 245 */ 246 void 247 rdfs(bno, size, bf) 248 daddr_t bno; 249 int size; 250 char *bf; 251 { 252 int n; 253 254 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) == -1) 255 err(1, "seek error at block %lld", (long long)bno); 256 257 switch (n = read(fsi, bf, size)) { 258 case -1: 259 err(1, "read error at block %lld", (long long)bno); 260 break; 261 262 default: 263 if (n == size) 264 return; 265 errx(1, "incomplete read at block %lld", (long long)bno); 266 } 267 } 268