1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 static char sccsid[] = "@(#)setup.c 5.19 (Berkeley) 05/07/88"; 9 #endif not lint 10 11 #define DKTYPENAMES 12 #include <sys/param.h> 13 #include <sys/inode.h> 14 #include <sys/fs.h> 15 #include <sys/stat.h> 16 #include <sys/ioctl.h> 17 #include <sys/disklabel.h> 18 #include <sys/file.h> 19 #include <machine/endian.h> 20 #include <ctype.h> 21 #include "fsck.h" 22 23 BUFAREA asblk; 24 #define altsblock (*asblk.b_un.b_fs) 25 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 26 27 char *calloc(); 28 char *index(); 29 30 setup(dev) 31 char *dev; 32 { 33 dev_t rootdev; 34 long cg, ncg, size, asked, i, j; 35 struct disklabel *getdisklabel(), *lp; 36 struct stat statb; 37 struct fs proto; 38 39 havesb = 0; 40 if (stat("/", &statb) < 0) 41 errexit("Can't stat root\n"); 42 rootdev = statb.st_dev; 43 if (stat(dev, &statb) < 0) { 44 perror(dev); 45 printf("Can't stat %s\n", dev); 46 return (0); 47 } 48 rawflg = 0; 49 if ((statb.st_mode & S_IFMT) == S_IFBLK) 50 ; 51 else if ((statb.st_mode & S_IFMT) == S_IFCHR) 52 rawflg++; 53 else { 54 if (reply("file is not a block or character device; OK") == 0) 55 return (0); 56 } 57 if (rootdev == statb.st_rdev) 58 hotroot++; 59 if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) { 60 perror(dev); 61 printf("Can't open %s\n", dev); 62 return (0); 63 } 64 if (preen == 0) 65 printf("** %s", dev); 66 if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) { 67 dfile.wfdes = -1; 68 if (preen) 69 pfatal("NO WRITE ACCESS"); 70 printf(" (NO WRITE)"); 71 } 72 if (preen == 0) 73 printf("\n"); 74 dfile.mod = 0; 75 lfdir = 0; 76 initbarea(&sblk); 77 initbarea(&asblk); 78 sblk.b_un.b_buf = (char *)malloc(SBSIZE); 79 asblk.b_un.b_buf = (char *)malloc(SBSIZE); 80 if (sblk.b_un.b_buf == 0 || asblk.b_un.b_buf == 0) 81 errexit("cannot allocate space for superblock\n"); 82 if (lp = getdisklabel((char *)NULL, dfile.rfdes)) 83 dev_bsize = secsize = lp->d_secsize; 84 else 85 dev_bsize = secsize = DEV_BSIZE; 86 /* 87 * Read in the superblock, looking for alternates if necessary 88 */ 89 if (readsb(1) == 0) { 90 if (bflag || preen || calcsb(dev, dfile.rfdes, &proto) == 0) 91 return(0); 92 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 93 return (0); 94 for (cg = 0; cg < proto.fs_ncg; cg++) { 95 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 96 if (readsb(0) != 0) 97 break; 98 } 99 if (cg >= proto.fs_ncg) { 100 printf("%s %s\n%s %s\n%s %s\n", 101 "SEARCH FOR ALTERNATE SUPER-BLOCK", 102 "FAILED. YOU MUST USE THE", 103 "-b OPTION TO FSCK TO SPECIFY THE", 104 "LOCATION OF AN ALTERNATE", 105 "SUPER-BLOCK TO SUPPLY NEEDED", 106 "INFORMATION; SEE fsck(8)."); 107 return(0); 108 } 109 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 110 } 111 fmax = sblock.fs_size; 112 imax = sblock.fs_ncg * sblock.fs_ipg; 113 /* 114 * Check and potentially fix certain fields in the super block. 115 */ 116 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 117 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 118 if (reply("SET TO DEFAULT") == 1) { 119 sblock.fs_optim = FS_OPTTIME; 120 sbdirty(); 121 } 122 } 123 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 124 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 125 sblock.fs_minfree); 126 if (reply("SET TO DEFAULT") == 1) { 127 sblock.fs_minfree = 10; 128 sbdirty(); 129 } 130 } 131 if (sblock.fs_interleave < 1) { 132 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 133 sblock.fs_interleave); 134 sblock.fs_interleave = 1; 135 if (preen) 136 printf(" (FIXED)\n"); 137 if (preen || reply("SET TO DEFAULT") == 1) { 138 sbdirty(); 139 dirty(&asblk); 140 } 141 } 142 if (sblock.fs_npsect < sblock.fs_nsect) { 143 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 144 sblock.fs_npsect); 145 sblock.fs_npsect = sblock.fs_nsect; 146 if (preen) 147 printf(" (FIXED)\n"); 148 if (preen || reply("SET TO DEFAULT") == 1) { 149 sbdirty(); 150 dirty(&asblk); 151 } 152 } 153 if (cvtflag) { 154 if (sblock.fs_postblformat == FS_42POSTBLFMT) { 155 /* 156 * Requested to convert from old format to new format 157 */ 158 if (preen) 159 pwarn("CONVERTING TO NEW FILE SYSTEM FORMAT\n"); 160 else if (!reply("CONVERT TO NEW FILE SYSTEM FORMAT")) 161 return(0); 162 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 163 sblock.fs_nrpos = 8; 164 sblock.fs_postbloff = 165 (char *)(&sblock.fs_opostbl[0][0]) - 166 (char *)(&sblock.fs_link); 167 sblock.fs_rotbloff = &sblock.fs_space[0] - 168 (u_char *)(&sblock.fs_link); 169 /* 170 * Planning now for future expansion. 171 */ 172 # if (BYTE_ORDER == BIG_ENDIAN) 173 sblock.fs_qbmask.val[0] = 0; 174 sblock.fs_qbmask.val[1] = ~sblock.fs_bmask; 175 sblock.fs_qfmask.val[0] = 0; 176 sblock.fs_qfmask.val[1] = ~sblock.fs_fmask; 177 # endif /* BIG_ENDIAN */ 178 # if (BYTE_ORDER == LITTLE_ENDIAN) 179 sblock.fs_qbmask.val[0] = ~sblock.fs_bmask; 180 sblock.fs_qbmask.val[1] = 0; 181 sblock.fs_qfmask.val[0] = ~sblock.fs_fmask; 182 sblock.fs_qfmask.val[1] = 0; 183 # endif /* LITTLE_ENDIAN */ 184 sbdirty(); 185 dirty(&asblk); 186 } else if (sblock.fs_postblformat == FS_DYNAMICPOSTBLFMT) { 187 /* 188 * Requested to convert from new format to old format 189 */ 190 if (sblock.fs_nrpos != 8 || sblock.fs_ipg > 2048 || 191 sblock.fs_cpg > 32 || sblock.fs_cpc > 16) { 192 printf( 193 "PARAMETERS OF CURRENT FILE SYSTEM DO NOT\n\t"); 194 errexit( 195 "ALLOW CONVERSION TO OLD FILE SYSTEM FORMAT\n"); 196 } 197 if (preen) 198 pwarn("CONVERTING TO OLD FILE SYSTEM FORMAT\n"); 199 else if (!reply("CONVERT TO OLD FILE SYSTEM FORMAT")) 200 return(0); 201 sblock.fs_postblformat = FS_42POSTBLFMT; 202 sbdirty(); 203 dirty(&asblk); 204 } else { 205 errexit("UNKNOWN FILE SYSTEM FORMAT\n"); 206 } 207 } 208 if (asblk.b_dirty) { 209 bcopy((char *)&sblock, (char *)&altsblock, sblock.fs_sbsize); 210 flush(&dfile, &asblk); 211 } 212 /* 213 * read in the summary info. 214 */ 215 asked = 0; 216 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 217 size = sblock.fs_cssize - i < sblock.fs_bsize ? 218 sblock.fs_cssize - i : sblock.fs_bsize; 219 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 220 if (bread(&dfile, (char *)sblock.fs_csp[j], 221 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 222 size) != 0 && !asked) { 223 pfatal("BAD SUMMARY INFORMATION"); 224 if (reply("CONTINUE") == 0) 225 errexit(""); 226 asked++; 227 } 228 } 229 /* 230 * allocate and initialize the necessary maps 231 */ 232 bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); 233 blockmap = calloc((unsigned)bmapsz, sizeof (char)); 234 if (blockmap == NULL) { 235 printf("cannot alloc %d bytes for blockmap\n", bmapsz); 236 goto badsb; 237 } 238 statemap = calloc((unsigned)(imax + 1), sizeof(char)); 239 if (statemap == NULL) { 240 printf("cannot alloc %d bytes for statemap\n", imax + 1); 241 goto badsb; 242 } 243 lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); 244 if (lncntp == NULL) { 245 printf("cannot alloc %d bytes for lncntp\n", 246 (imax + 1) * sizeof(short)); 247 goto badsb; 248 } 249 250 bufinit(); 251 return (1); 252 253 badsb: 254 ckfini(); 255 return (0); 256 } 257 258 /* 259 * Read in the super block and its summary info. 260 */ 261 readsb(listerr) 262 int listerr; 263 { 264 off_t sboff; 265 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 266 267 if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) 268 return (0); 269 sblk.b_bno = super; 270 sblk.b_size = SBSIZE; 271 /* 272 * run a few consistency checks of the super block 273 */ 274 if (sblock.fs_magic != FS_MAGIC) 275 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 276 if (sblock.fs_ncg < 1) 277 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 278 if (sblock.fs_cpg < 1) 279 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 280 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 281 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 282 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 283 if (sblock.fs_sbsize > SBSIZE) 284 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 285 /* 286 * Compute block size that the filesystem is based on, 287 * according to fsbtodb, and adjust superblock block number 288 * so we can tell if this is an alternate later. 289 */ 290 super *= dev_bsize; 291 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 292 sblk.b_bno = super / dev_bsize; 293 /* 294 * Set all possible fields that could differ, then do check 295 * of whole super block against an alternate super block. 296 * When an alternate super-block is specified this check is skipped. 297 */ 298 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 299 if (asblk.b_errs != NULL) 300 return (0); 301 if (bflag) { 302 havesb = 1; 303 return (1); 304 } 305 altsblock.fs_link = sblock.fs_link; 306 altsblock.fs_rlink = sblock.fs_rlink; 307 altsblock.fs_time = sblock.fs_time; 308 altsblock.fs_cstotal = sblock.fs_cstotal; 309 altsblock.fs_cgrotor = sblock.fs_cgrotor; 310 altsblock.fs_fmod = sblock.fs_fmod; 311 altsblock.fs_clean = sblock.fs_clean; 312 altsblock.fs_ronly = sblock.fs_ronly; 313 altsblock.fs_flags = sblock.fs_flags; 314 altsblock.fs_maxcontig = sblock.fs_maxcontig; 315 altsblock.fs_minfree = sblock.fs_minfree; 316 altsblock.fs_optim = sblock.fs_optim; 317 altsblock.fs_rotdelay = sblock.fs_rotdelay; 318 altsblock.fs_maxbpg = sblock.fs_maxbpg; 319 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 320 sizeof sblock.fs_csp); 321 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 322 sizeof sblock.fs_fsmnt); 323 bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon, 324 sizeof sblock.fs_sparecon); 325 /* 326 * The following should not have to be copied. 327 */ 328 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 329 altsblock.fs_interleave = sblock.fs_interleave; 330 altsblock.fs_npsect = sblock.fs_npsect; 331 altsblock.fs_nrpos = sblock.fs_nrpos; 332 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) { 333 badsb(listerr, 334 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 335 return (0); 336 } 337 havesb = 1; 338 return (1); 339 } 340 341 badsb(listerr, s) 342 int listerr; 343 char *s; 344 { 345 346 if (!listerr) 347 return; 348 if (preen) 349 printf("%s: ", devname); 350 pfatal("BAD SUPER BLOCK: %s\n", s); 351 } 352 353 /* 354 * Calculate a prototype superblock based on information in the disk label. 355 * When done the cgsblock macro can be calculated and the fs_ncg field 356 * can be used. Do NOT attempt to use other macros without verifying that 357 * their needed information is available! 358 */ 359 calcsb(dev, devfd, fs) 360 char *dev; 361 int devfd; 362 register struct fs *fs; 363 { 364 register struct disklabel *lp; 365 register struct partition *pp; 366 register char *cp; 367 int i; 368 struct disklabel *getdisklabel(); 369 370 cp = index(dev, '\0') - 1; 371 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 372 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 373 return (0); 374 } 375 lp = getdisklabel(dev, devfd); 376 if (isdigit(*cp)) 377 pp = &lp->d_partitions[0]; 378 else 379 pp = &lp->d_partitions[*cp - 'a']; 380 if (pp->p_fstype != FS_BSDFFS) { 381 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 382 dev, pp->p_fstype < FSMAXTYPES ? 383 fstypenames[pp->p_fstype] : "unknown"); 384 return (0); 385 } 386 bzero(fs, sizeof(struct fs)); 387 fs->fs_fsize = pp->p_fsize; 388 fs->fs_frag = pp->p_frag; 389 fs->fs_cpg = pp->p_cpg; 390 fs->fs_size = pp->p_size; 391 fs->fs_ntrak = lp->d_ntracks; 392 fs->fs_nsect = lp->d_nsectors; 393 fs->fs_spc = lp->d_secpercyl; 394 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 395 fs->fs_sblkno = roundup( 396 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 397 fs->fs_frag); 398 fs->fs_cgmask = 0xffffffff; 399 for (i = fs->fs_ntrak; i > 1; i >>= 1) 400 fs->fs_cgmask <<= 1; 401 if (!POWEROF2(fs->fs_ntrak)) 402 fs->fs_cgmask <<= 1; 403 fs->fs_cgoffset = roundup( 404 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 405 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 406 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 407 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 408 fs->fs_fsbtodb++; 409 dev_bsize = lp->d_secsize; 410 return (1); 411 } 412 413 struct disklabel * 414 getdisklabel(s, fd) 415 char *s; 416 int fd; 417 { 418 static struct disklabel lab; 419 420 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 421 if (s == NULL) 422 return ((struct disklabel *)NULL); 423 pwarn(""); 424 perror("ioctl (GDINFO)"); 425 errexit("%s: can't read disk label", s); 426 } 427 return (&lab); 428 } 429