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 5.21 (Berkeley) 06/26/89"; 9 #endif not lint 10 11 #define DKTYPENAMES 12 #include <sys/param.h> 13 #include <sys/time.h> 14 #include <sys/vnode.h> 15 #include <ufs/inode.h> 16 #include <ufs/fs.h> 17 #include <sys/stat.h> 18 #include <sys/ioctl.h> 19 #include <sys/disklabel.h> 20 #include <sys/file.h> 21 #include <machine/endian.h> 22 #include <ctype.h> 23 #include "fsck.h" 24 25 BUFAREA asblk; 26 #define altsblock (*asblk.b_un.b_fs) 27 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 28 29 /* 30 * The size of a cylinder group is calculated by CGSIZE. The maximum size 31 * is limited by the fact that cylinder groups are at most one block. 32 * Its size is derived from the size of the maps maintained in the 33 * cylinder group and the (struct cg) size. 34 */ 35 #define CGSIZE(fs) \ 36 /* base cg */ (sizeof(struct cg) + \ 37 /* blktot size */ (fs)->fs_cpg * sizeof(long) + \ 38 /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(short) + \ 39 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ 40 /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY)) 41 42 char *calloc(); 43 char *index(); 44 45 setup(dev) 46 char *dev; 47 { 48 dev_t rootdev; 49 long cg, ncg, size, asked, i, j; 50 struct disklabel *getdisklabel(), *lp; 51 struct stat statb; 52 struct fs proto; 53 54 havesb = 0; 55 if (stat("/", &statb) < 0) 56 errexit("Can't stat root\n"); 57 rootdev = statb.st_dev; 58 if (stat(dev, &statb) < 0) { 59 perror(dev); 60 printf("Can't stat %s\n", dev); 61 return (0); 62 } 63 rawflg = 0; 64 if ((statb.st_mode & S_IFMT) == S_IFBLK) 65 ; 66 else if ((statb.st_mode & S_IFMT) == S_IFCHR) 67 rawflg++; 68 else { 69 if (reply("file is not a block or character device; OK") == 0) 70 return (0); 71 } 72 if (rootdev == statb.st_rdev) 73 hotroot++; 74 if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) { 75 perror(dev); 76 printf("Can't open %s\n", dev); 77 return (0); 78 } 79 if (preen == 0) 80 printf("** %s", dev); 81 if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) { 82 dfile.wfdes = -1; 83 if (preen) 84 pfatal("NO WRITE ACCESS"); 85 printf(" (NO WRITE)"); 86 } 87 if (preen == 0) 88 printf("\n"); 89 dfile.mod = 0; 90 lfdir = 0; 91 initbarea(&sblk); 92 initbarea(&asblk); 93 sblk.b_un.b_buf = (char *)malloc(SBSIZE); 94 asblk.b_un.b_buf = (char *)malloc(SBSIZE); 95 if (sblk.b_un.b_buf == 0 || asblk.b_un.b_buf == 0) 96 errexit("cannot allocate space for superblock\n"); 97 if (lp = getdisklabel((char *)NULL, dfile.rfdes)) 98 dev_bsize = secsize = lp->d_secsize; 99 else 100 dev_bsize = secsize = DEV_BSIZE; 101 /* 102 * Read in the superblock, looking for alternates if necessary 103 */ 104 if (readsb(1) == 0) { 105 if (bflag || preen || calcsb(dev, dfile.rfdes, &proto) == 0) 106 return(0); 107 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 108 return (0); 109 for (cg = 0; cg < proto.fs_ncg; cg++) { 110 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 111 if (readsb(0) != 0) 112 break; 113 } 114 if (cg >= proto.fs_ncg) { 115 printf("%s %s\n%s %s\n%s %s\n", 116 "SEARCH FOR ALTERNATE SUPER-BLOCK", 117 "FAILED. YOU MUST USE THE", 118 "-b OPTION TO FSCK TO SPECIFY THE", 119 "LOCATION OF AN ALTERNATE", 120 "SUPER-BLOCK TO SUPPLY NEEDED", 121 "INFORMATION; SEE fsck(8)."); 122 return(0); 123 } 124 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 125 } 126 fmax = sblock.fs_size; 127 imax = sblock.fs_ncg * sblock.fs_ipg; 128 /* 129 * Check and potentially fix certain fields in the super block. 130 */ 131 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 132 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 133 if (reply("SET TO DEFAULT") == 1) { 134 sblock.fs_optim = FS_OPTTIME; 135 sbdirty(); 136 } 137 } 138 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 139 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 140 sblock.fs_minfree); 141 if (reply("SET TO DEFAULT") == 1) { 142 sblock.fs_minfree = 10; 143 sbdirty(); 144 } 145 } 146 if (sblock.fs_interleave < 1) { 147 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 148 sblock.fs_interleave); 149 sblock.fs_interleave = 1; 150 if (preen) 151 printf(" (FIXED)\n"); 152 if (preen || reply("SET TO DEFAULT") == 1) { 153 sbdirty(); 154 dirty(&asblk); 155 } 156 } 157 if (sblock.fs_npsect < sblock.fs_nsect) { 158 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 159 sblock.fs_npsect); 160 sblock.fs_npsect = sblock.fs_nsect; 161 if (preen) 162 printf(" (FIXED)\n"); 163 if (preen || reply("SET TO DEFAULT") == 1) { 164 sbdirty(); 165 dirty(&asblk); 166 } 167 } 168 if (cvtflag) { 169 if (sblock.fs_postblformat == FS_42POSTBLFMT) { 170 /* 171 * Requested to convert from old format to new format 172 */ 173 if (preen) 174 pwarn("CONVERTING TO NEW FILE SYSTEM FORMAT\n"); 175 else if (!reply("CONVERT TO NEW FILE SYSTEM FORMAT")) 176 return(0); 177 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 178 sblock.fs_nrpos = 8; 179 sblock.fs_postbloff = 180 (char *)(&sblock.fs_opostbl[0][0]) - 181 (char *)(&sblock.fs_link); 182 sblock.fs_rotbloff = &sblock.fs_space[0] - 183 (u_char *)(&sblock.fs_link); 184 sblock.fs_cgsize = 185 fragroundup(&sblock, CGSIZE(&sblock)); 186 /* 187 * Planning now for future expansion. 188 */ 189 # if (BYTE_ORDER == BIG_ENDIAN) 190 sblock.fs_qbmask.val[0] = 0; 191 sblock.fs_qbmask.val[1] = ~sblock.fs_bmask; 192 sblock.fs_qfmask.val[0] = 0; 193 sblock.fs_qfmask.val[1] = ~sblock.fs_fmask; 194 # endif /* BIG_ENDIAN */ 195 # if (BYTE_ORDER == LITTLE_ENDIAN) 196 sblock.fs_qbmask.val[0] = ~sblock.fs_bmask; 197 sblock.fs_qbmask.val[1] = 0; 198 sblock.fs_qfmask.val[0] = ~sblock.fs_fmask; 199 sblock.fs_qfmask.val[1] = 0; 200 # endif /* LITTLE_ENDIAN */ 201 sbdirty(); 202 dirty(&asblk); 203 } else if (sblock.fs_postblformat == FS_DYNAMICPOSTBLFMT) { 204 /* 205 * Requested to convert from new format to old format 206 */ 207 if (sblock.fs_nrpos != 8 || sblock.fs_ipg > 2048 || 208 sblock.fs_cpg > 32 || sblock.fs_cpc > 16) { 209 printf( 210 "PARAMETERS OF CURRENT FILE SYSTEM DO NOT\n\t"); 211 errexit( 212 "ALLOW CONVERSION TO OLD FILE SYSTEM FORMAT\n"); 213 } 214 if (preen) 215 pwarn("CONVERTING TO OLD FILE SYSTEM FORMAT\n"); 216 else if (!reply("CONVERT TO OLD FILE SYSTEM FORMAT")) 217 return(0); 218 sblock.fs_postblformat = FS_42POSTBLFMT; 219 sblock.fs_cgsize = fragroundup(&sblock, 220 sizeof(struct ocg) + howmany(sblock.fs_fpg, NBBY)); 221 sbdirty(); 222 dirty(&asblk); 223 } else { 224 errexit("UNKNOWN FILE SYSTEM FORMAT\n"); 225 } 226 } 227 if (asblk.b_dirty) { 228 bcopy((char *)&sblock, (char *)&altsblock, sblock.fs_sbsize); 229 flush(&dfile, &asblk); 230 } 231 /* 232 * read in the summary info. 233 */ 234 asked = 0; 235 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 236 size = sblock.fs_cssize - i < sblock.fs_bsize ? 237 sblock.fs_cssize - i : sblock.fs_bsize; 238 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 239 if (bread(&dfile, (char *)sblock.fs_csp[j], 240 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 241 size) != 0 && !asked) { 242 pfatal("BAD SUMMARY INFORMATION"); 243 if (reply("CONTINUE") == 0) 244 errexit(""); 245 asked++; 246 } 247 } 248 /* 249 * allocate and initialize the necessary maps 250 */ 251 bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); 252 blockmap = calloc((unsigned)bmapsz, sizeof (char)); 253 if (blockmap == NULL) { 254 printf("cannot alloc %d bytes for blockmap\n", bmapsz); 255 goto badsb; 256 } 257 statemap = calloc((unsigned)(imax + 1), sizeof(char)); 258 if (statemap == NULL) { 259 printf("cannot alloc %d bytes for statemap\n", imax + 1); 260 goto badsb; 261 } 262 lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); 263 if (lncntp == NULL) { 264 printf("cannot alloc %d bytes for lncntp\n", 265 (imax + 1) * sizeof(short)); 266 goto badsb; 267 } 268 269 bufinit(); 270 return (1); 271 272 badsb: 273 ckfini(); 274 return (0); 275 } 276 277 /* 278 * Read in the super block and its summary info. 279 */ 280 readsb(listerr) 281 int listerr; 282 { 283 off_t sboff; 284 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 285 286 if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) 287 return (0); 288 sblk.b_bno = super; 289 sblk.b_size = SBSIZE; 290 /* 291 * run a few consistency checks of the super block 292 */ 293 if (sblock.fs_magic != FS_MAGIC) 294 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 295 if (sblock.fs_ncg < 1) 296 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 297 if (sblock.fs_cpg < 1) 298 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 299 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 300 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 301 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 302 if (sblock.fs_sbsize > SBSIZE) 303 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 304 /* 305 * Compute block size that the filesystem is based on, 306 * according to fsbtodb, and adjust superblock block number 307 * so we can tell if this is an alternate later. 308 */ 309 super *= dev_bsize; 310 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 311 sblk.b_bno = super / dev_bsize; 312 /* 313 * Set all possible fields that could differ, then do check 314 * of whole super block against an alternate super block. 315 * When an alternate super-block is specified this check is skipped. 316 */ 317 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 318 if (asblk.b_errs != NULL) 319 return (0); 320 if (bflag) { 321 havesb = 1; 322 return (1); 323 } 324 altsblock.fs_link = sblock.fs_link; 325 altsblock.fs_rlink = sblock.fs_rlink; 326 altsblock.fs_time = sblock.fs_time; 327 altsblock.fs_cstotal = sblock.fs_cstotal; 328 altsblock.fs_cgrotor = sblock.fs_cgrotor; 329 altsblock.fs_fmod = sblock.fs_fmod; 330 altsblock.fs_clean = sblock.fs_clean; 331 altsblock.fs_ronly = sblock.fs_ronly; 332 altsblock.fs_flags = sblock.fs_flags; 333 altsblock.fs_maxcontig = sblock.fs_maxcontig; 334 altsblock.fs_minfree = sblock.fs_minfree; 335 altsblock.fs_optim = sblock.fs_optim; 336 altsblock.fs_rotdelay = sblock.fs_rotdelay; 337 altsblock.fs_maxbpg = sblock.fs_maxbpg; 338 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 339 sizeof sblock.fs_csp); 340 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 341 sizeof sblock.fs_fsmnt); 342 bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon, 343 sizeof sblock.fs_sparecon); 344 /* 345 * The following should not have to be copied. 346 */ 347 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 348 altsblock.fs_interleave = sblock.fs_interleave; 349 altsblock.fs_npsect = sblock.fs_npsect; 350 altsblock.fs_nrpos = sblock.fs_nrpos; 351 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) { 352 badsb(listerr, 353 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 354 return (0); 355 } 356 havesb = 1; 357 return (1); 358 } 359 360 badsb(listerr, s) 361 int listerr; 362 char *s; 363 { 364 365 if (!listerr) 366 return; 367 if (preen) 368 printf("%s: ", devname); 369 pfatal("BAD SUPER BLOCK: %s\n", s); 370 } 371 372 /* 373 * Calculate a prototype superblock based on information in the disk label. 374 * When done the cgsblock macro can be calculated and the fs_ncg field 375 * can be used. Do NOT attempt to use other macros without verifying that 376 * their needed information is available! 377 */ 378 calcsb(dev, devfd, fs) 379 char *dev; 380 int devfd; 381 register struct fs *fs; 382 { 383 register struct disklabel *lp; 384 register struct partition *pp; 385 register char *cp; 386 int i; 387 struct disklabel *getdisklabel(); 388 389 cp = index(dev, '\0') - 1; 390 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 391 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 392 return (0); 393 } 394 lp = getdisklabel(dev, devfd); 395 if (isdigit(*cp)) 396 pp = &lp->d_partitions[0]; 397 else 398 pp = &lp->d_partitions[*cp - 'a']; 399 if (pp->p_fstype != FS_BSDFFS) { 400 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 401 dev, pp->p_fstype < FSMAXTYPES ? 402 fstypenames[pp->p_fstype] : "unknown"); 403 return (0); 404 } 405 bzero(fs, sizeof(struct fs)); 406 fs->fs_fsize = pp->p_fsize; 407 fs->fs_frag = pp->p_frag; 408 fs->fs_cpg = pp->p_cpg; 409 fs->fs_size = pp->p_size; 410 fs->fs_ntrak = lp->d_ntracks; 411 fs->fs_nsect = lp->d_nsectors; 412 fs->fs_spc = lp->d_secpercyl; 413 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 414 fs->fs_sblkno = roundup( 415 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 416 fs->fs_frag); 417 fs->fs_cgmask = 0xffffffff; 418 for (i = fs->fs_ntrak; i > 1; i >>= 1) 419 fs->fs_cgmask <<= 1; 420 if (!POWEROF2(fs->fs_ntrak)) 421 fs->fs_cgmask <<= 1; 422 fs->fs_cgoffset = roundup( 423 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 424 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 425 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 426 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 427 fs->fs_fsbtodb++; 428 dev_bsize = lp->d_secsize; 429 return (1); 430 } 431 432 struct disklabel * 433 getdisklabel(s, fd) 434 char *s; 435 int fd; 436 { 437 static struct disklabel lab; 438 439 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 440 if (s == NULL) 441 return ((struct disklabel *)NULL); 442 pwarn(""); 443 perror("ioctl (GDINFO)"); 444 errexit("%s: can't read disk label", s); 445 } 446 return (&lab); 447 } 448