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