setup.c revision 1.37
1 /* $NetBSD: setup.c,v 1.37 1999/11/15 19:18:26 fvdl Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1986, 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 #if 0 39 static char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; 40 #else 41 __RCSID("$NetBSD: setup.c,v 1.37 1999/11/15 19:18:26 fvdl Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/stat.h> 48 #include <sys/ioctl.h> 49 #define FSTYPENAMES 50 #include <sys/disklabel.h> 51 #include <sys/file.h> 52 53 #include <ufs/ufs/dinode.h> 54 #include <ufs/ufs/ufs_bswap.h> 55 #include <ufs/ffs/fs.h> 56 #include <ufs/ffs/ffs_extern.h> 57 58 #include <ctype.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 65 #include "fsck.h" 66 #include "extern.h" 67 #include "fsutil.h" 68 69 struct bufarea asblk; 70 struct fs *altsblock; 71 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 72 73 static void badsb __P((int, char *)); 74 static int calcsb __P((const char *, int, struct fs *)); 75 static struct disklabel *getdisklabel __P((const char *, int)); 76 static int readsb __P((int)); 77 78 /* 79 * Read in a superblock finding an alternate if necessary. 80 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 81 * is already clean (preen mode only). 82 */ 83 int 84 setup(dev) 85 const char *dev; 86 { 87 long cg, size, asked, i, j; 88 long bmapsize; 89 struct disklabel *lp; 90 off_t sizepb; 91 struct stat statb; 92 struct fs proto; 93 int doskipclean; 94 u_int64_t maxfilesize; 95 96 havesb = 0; 97 fswritefd = -1; 98 doskipclean = skipclean; 99 if (stat(dev, &statb) < 0) { 100 printf("Can't stat %s: %s\n", dev, strerror(errno)); 101 return (0); 102 } 103 if (!S_ISCHR(statb.st_mode)) { 104 pfatal("%s is not a character device", dev); 105 if (reply("CONTINUE") == 0) 106 return (0); 107 } 108 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 109 printf("Can't open %s: %s\n", dev, strerror(errno)); 110 return (0); 111 } 112 if (preen == 0) 113 printf("** %s", dev); 114 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 115 fswritefd = -1; 116 if (preen) 117 pfatal("NO WRITE ACCESS"); 118 printf(" (NO WRITE)"); 119 } 120 if (preen == 0) 121 printf("\n"); 122 fsmodified = 0; 123 lfdir = 0; 124 initbarea(&sblk); 125 initbarea(&asblk); 126 sblk.b_un.b_buf = malloc(SBSIZE); 127 sblock = malloc(SBSIZE); 128 asblk.b_un.b_buf = malloc(SBSIZE); 129 altsblock = malloc(SBSIZE); 130 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL || 131 sblock == NULL || altsblock == NULL) 132 errx(EEXIT, "cannot allocate space for superblock"); 133 if ((lp = getdisklabel(NULL, fsreadfd)) != NULL) 134 dev_bsize = secsize = lp->d_secsize; 135 else 136 dev_bsize = secsize = DEV_BSIZE; 137 /* 138 * Read in the superblock, looking for alternates if necessary 139 */ 140 if (readsb(1) == 0) { 141 #ifdef LITE2BORKEN 142 skipclean = 0; 143 #endif 144 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 145 return(0); 146 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 147 return (0); 148 for (cg = 0; cg < proto.fs_ncg; cg++) { 149 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 150 if (readsb(0) != 0) 151 break; 152 } 153 if (cg >= proto.fs_ncg) { 154 printf("%s %s\n%s %s\n%s %s\n", 155 "SEARCH FOR ALTERNATE SUPER-BLOCK", 156 "FAILED. YOU MUST USE THE", 157 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 158 "LOCATION OF AN ALTERNATE", 159 "SUPER-BLOCK TO SUPPLY NEEDED", 160 "INFORMATION; SEE fsck_ffs(8)."); 161 return(0); 162 } 163 doskipclean = 0; 164 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 165 } 166 if (debug) 167 printf("clean = %d\n", sblock->fs_clean); 168 if (doswap) 169 doskipclean = 0; 170 if (sblock->fs_clean & FS_ISCLEAN) { 171 if (doskipclean) { 172 pwarn("%sile system is clean; not checking\n", 173 preen ? "f" : "** F"); 174 return (-1); 175 } 176 if (!preen && !doswap) 177 pwarn("** File system is already clean\n"); 178 } 179 maxfsblock = sblock->fs_size; 180 maxino = sblock->fs_ncg * sblock->fs_ipg; 181 sizepb = sblock->fs_bsize; 182 maxfilesize = sblock->fs_bsize * NDADDR - 1; 183 for (i = 0; i < NIADDR; i++) { 184 sizepb *= NINDIR(sblock); 185 maxfilesize += sizepb; 186 } 187 /* 188 * Check and potentially fix certain fields in the super block. 189 */ 190 if (sblock->fs_optim != FS_OPTTIME && sblock->fs_optim != FS_OPTSPACE) { 191 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 192 if (reply("SET TO DEFAULT") == 1) { 193 sblock->fs_optim = FS_OPTTIME; 194 sbdirty(); 195 } 196 } 197 if ((sblock->fs_minfree < 0 || sblock->fs_minfree > 99)) { 198 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 199 sblock->fs_minfree); 200 if (reply("SET TO DEFAULT") == 1) { 201 sblock->fs_minfree = 10; 202 sbdirty(); 203 } 204 } 205 if (sblock->fs_interleave < 1 || 206 sblock->fs_interleave > sblock->fs_nsect) { 207 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 208 sblock->fs_interleave); 209 sblock->fs_interleave = 1; 210 if (preen) 211 printf(" (FIXED)\n"); 212 if (preen || reply("SET TO DEFAULT") == 1) { 213 sbdirty(); 214 dirty(&asblk); 215 } 216 } 217 if (sblock->fs_npsect < sblock->fs_nsect || 218 sblock->fs_npsect > sblock->fs_nsect*2) { 219 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 220 sblock->fs_npsect); 221 sblock->fs_npsect = sblock->fs_nsect; 222 if (preen) 223 printf(" (FIXED)\n"); 224 if (preen || reply("SET TO DEFAULT") == 1) { 225 sbdirty(); 226 dirty(&asblk); 227 } 228 } 229 if (sblock->fs_bmask != ~(sblock->fs_bsize - 1)) { 230 pwarn("INCORRECT BMASK=0x%x IN SUPERBLOCK", 231 sblock->fs_bmask); 232 sblock->fs_bmask = ~(sblock->fs_bsize - 1); 233 if (preen) 234 printf(" (FIXED)\n"); 235 if (preen || reply("FIX") == 1) { 236 sbdirty(); 237 dirty(&asblk); 238 } 239 } 240 if (sblock->fs_fmask != ~(sblock->fs_fsize - 1)) { 241 pwarn("INCORRECT FMASK=0x%x IN SUPERBLOCK", 242 sblock->fs_fmask); 243 sblock->fs_fmask = ~(sblock->fs_fsize - 1); 244 if (preen) 245 printf(" (FIXED)\n"); 246 if (preen || reply("FIX") == 1) { 247 sbdirty(); 248 dirty(&asblk); 249 } 250 } 251 if (sblock->fs_inodefmt >= FS_44INODEFMT) { 252 if (sblock->fs_maxfilesize != maxfilesize) { 253 pwarn("INCORRECT MAXFILESIZE=%qd IN SUPERBLOCK", 254 (unsigned long long)sblock->fs_maxfilesize); 255 sblock->fs_maxfilesize = maxfilesize; 256 if (preen) 257 printf(" (FIXED)\n"); 258 if (preen || reply("FIX") == 1) { 259 sbdirty(); 260 dirty(&asblk); 261 } 262 } 263 if (sblock->fs_maxsymlinklen != MAXSYMLINKLEN) { 264 pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", 265 sblock->fs_maxsymlinklen); 266 sblock->fs_maxsymlinklen = MAXSYMLINKLEN; 267 if (preen) 268 printf(" (FIXED)\n"); 269 if (preen || reply("FIX") == 1) { 270 sbdirty(); 271 dirty(&asblk); 272 } 273 } 274 if (sblock->fs_qbmask != ~sblock->fs_bmask) { 275 pwarn("INCORRECT QBMASK=%qx IN SUPERBLOCK", 276 (unsigned long long)sblock->fs_qbmask); 277 sblock->fs_qbmask = ~sblock->fs_bmask; 278 if (preen) 279 printf(" (FIXED)\n"); 280 if (preen || reply("FIX") == 1) { 281 sbdirty(); 282 dirty(&asblk); 283 } 284 } 285 if (sblock->fs_qfmask != ~sblock->fs_fmask) { 286 pwarn("INCORRECT QFMASK=%qx IN SUPERBLOCK", 287 (unsigned long long)sblock->fs_qfmask); 288 sblock->fs_qfmask = ~sblock->fs_fmask; 289 if (preen) 290 printf(" (FIXED)\n"); 291 if (preen || reply("FIX") == 1) { 292 sbdirty(); 293 dirty(&asblk); 294 } 295 } 296 newinofmt = 1; 297 } else { 298 sblock->fs_qbmask = ~sblock->fs_bmask; 299 sblock->fs_qfmask = ~sblock->fs_fmask; 300 newinofmt = 0; 301 } 302 /* 303 * Convert to new inode format. 304 */ 305 if (cvtlevel >= 2 && sblock->fs_inodefmt < FS_44INODEFMT) { 306 if (preen) 307 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 308 else if (!reply("CONVERT TO NEW INODE FORMAT")) 309 return(0); 310 doinglevel2++; 311 sblock->fs_inodefmt = FS_44INODEFMT; 312 sblock->fs_maxfilesize = maxfilesize; 313 sblock->fs_maxsymlinklen = MAXSYMLINKLEN; 314 sblock->fs_qbmask = ~sblock->fs_bmask; 315 sblock->fs_qfmask = ~sblock->fs_fmask; 316 sbdirty(); 317 dirty(&asblk); 318 } 319 /* 320 * Convert to new cylinder group format. 321 */ 322 if (cvtlevel >= 1 && sblock->fs_postblformat == FS_42POSTBLFMT) { 323 if (preen) 324 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 325 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 326 return(0); 327 doinglevel1++; 328 sblock->fs_postblformat = FS_DYNAMICPOSTBLFMT; 329 sblock->fs_nrpos = 8; 330 sblock->fs_postbloff = 331 (char *)(&sblock->fs_opostbl[0][0]) - 332 (char *)(&sblock->fs_firstfield); 333 sblock->fs_rotbloff = &sblock->fs_space[0] - 334 (u_char *)(&sblock->fs_firstfield); 335 sblock->fs_cgsize = 336 fragroundup(sblock, CGSIZE(sblock)); 337 sbdirty(); 338 dirty(&asblk); 339 } 340 if (asblk.b_dirty && !bflag) { 341 memmove((struct fs*)sblk.b_un.b_fs, sblock, SBSIZE); 342 if (needswap) 343 ffs_sb_swap(sblock, (struct fs*)sblk.b_un.b_fs, 1); 344 memmove(asblk.b_un.b_fs, sblk.b_un.b_fs, (size_t)sblock->fs_sbsize); 345 flush(fswritefd, &asblk); 346 } 347 /* 348 * read in the summary info. 349 */ 350 asked = 0; 351 for (i = 0, j = 0; i < sblock->fs_cssize; i += sblock->fs_bsize, j++) { 352 size = sblock->fs_cssize - i < sblock->fs_bsize ? 353 sblock->fs_cssize - i : sblock->fs_bsize; 354 sblock->fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 355 if (bread(fsreadfd, (char *)sblock->fs_csp[j], 356 fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag), 357 size) != 0 && !asked) { 358 pfatal("BAD SUMMARY INFORMATION"); 359 if (reply("CONTINUE") == 0) { 360 markclean = 0; 361 exit(EEXIT); 362 } 363 asked++; 364 } 365 /* 366 * The following assumes that struct csum is made of 367 * u_int32_t 368 */ 369 if (doswap) { 370 int k; 371 u_int32_t *cd = (u_int32_t *)sblock->fs_csp[j]; 372 373 for (k = 0; k < size / sizeof(u_int32_t); k++) 374 cd[k] = bswap32(cd[k]); 375 bwrite(fswritefd, (char *)sblock->fs_csp[j], 376 fsbtodb(sblock, 377 sblock->fs_csaddr + j * sblock->fs_frag), 378 size); 379 } 380 if (needswap) { 381 int k; 382 u_int32_t *cd = (u_int32_t *)sblock->fs_csp[j]; 383 384 for (k = 0; k < size / sizeof(u_int32_t); k++) 385 cd[k] = bswap32(cd[k]); 386 } 387 } 388 /* 389 * allocate and initialize the necessary maps 390 */ 391 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 392 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 393 if (blockmap == NULL) { 394 printf("cannot alloc %u bytes for blockmap\n", 395 (unsigned)bmapsize); 396 goto badsblabel; 397 } 398 statemap = calloc((unsigned)(maxino + 1), sizeof(char)); 399 if (statemap == NULL) { 400 printf("cannot alloc %u bytes for statemap\n", 401 (unsigned)(maxino + 1)); 402 goto badsblabel; 403 } 404 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 405 if (typemap == NULL) { 406 printf("cannot alloc %u bytes for typemap\n", 407 (unsigned)(maxino + 1)); 408 goto badsblabel; 409 } 410 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 411 if (lncntp == NULL) { 412 printf("cannot alloc %u bytes for lncntp\n", 413 (unsigned)((maxino + 1) * sizeof(int16_t))); 414 goto badsblabel; 415 } 416 numdirs = sblock->fs_cstotal.cs_ndir; 417 inplast = 0; 418 listmax = numdirs + 10; 419 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 420 sizeof(struct inoinfo *)); 421 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 422 sizeof(struct inoinfo *)); 423 if (inpsort == NULL || inphead == NULL) { 424 printf("cannot alloc %u bytes for inphead\n", 425 (unsigned)(numdirs * sizeof(struct inoinfo *))); 426 goto badsblabel; 427 } 428 cgrp = malloc(sblock->fs_cgsize); 429 if (cgrp == NULL) { 430 printf("cannot alloc %u bytes for cylinder group\n", 431 sblock->fs_cgsize); 432 goto badsblabel; 433 } 434 bufinit(); 435 if (sblock->fs_flags & FS_DOSOFTDEP) 436 usedsoftdep = 1; 437 else 438 usedsoftdep = 0; 439 return (1); 440 441 badsblabel: 442 markclean=0; 443 ckfini(); 444 return (0); 445 } 446 447 /* 448 * Read in the super block and its summary info. 449 */ 450 static int 451 readsb(listerr) 452 int listerr; 453 { 454 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 455 struct fs *fs; 456 457 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 458 return (0); 459 sblk.b_bno = super; 460 sblk.b_size = SBSIZE; 461 462 fs = sblk.b_un.b_fs; 463 /* auto detect byte order */ 464 if( fs->fs_magic == FS_MAGIC) { 465 if (endian == 0 || BYTE_ORDER == endian) { 466 needswap = 0; 467 doswap = do_blkswap = do_dirswap = 0; 468 } else { 469 needswap = 1; 470 doswap = do_blkswap = do_dirswap = 1; 471 } 472 } else if (fs->fs_magic == bswap32(FS_MAGIC)) { 473 if (endian == 0 || BYTE_ORDER != endian) { 474 needswap = 1; 475 doswap = do_blkswap = do_dirswap = 0; 476 } else { 477 needswap = 0; 478 doswap = do_blkswap = do_dirswap = 1; 479 } 480 } else { 481 badsb(listerr, "MAGIC NUMBER WRONG"); 482 return (0); 483 } 484 if (doswap) { 485 if (preen) 486 errx(EEXIT, "incompatible options -B and -p"); 487 if (nflag) 488 errx(EEXIT, "incompatible options -B and -n"); 489 if (endian == LITTLE_ENDIAN) { 490 if (!reply("CONVERT TO LITTLE ENDIAN")) 491 return 0; 492 } else if (endian == BIG_ENDIAN) { 493 if (!reply("CONVERT TO BIG ENDIAN")) 494 return 0; 495 } else 496 pfatal("INTERNAL ERROR: unknown endian"); 497 } 498 if (needswap) 499 printf("** Swapped byte order\n"); 500 /* swap SB byte order if asked */ 501 if (doswap) 502 ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs, needswap); 503 504 memmove(sblock, sblk.b_un.b_fs, SBSIZE); 505 if (needswap) 506 ffs_sb_swap(sblk.b_un.b_fs, sblock, 0); 507 508 /* 509 * run a few consistency checks of the super block 510 */ 511 if (sblock->fs_ncg < 1) 512 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 513 if (sblock->fs_cpg < 1) 514 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 515 if (sblock->fs_ncg * sblock->fs_cpg < sblock->fs_ncyl || 516 (sblock->fs_ncg - 1) * sblock->fs_cpg >= sblock->fs_ncyl) 517 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 518 if (sblock->fs_sbsize > SBSIZE) 519 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 520 /* 521 * Compute block size that the filesystem is based on, 522 * according to fsbtodb, and adjust superblock block number 523 * so we can tell if this is an alternate later. 524 */ 525 super *= dev_bsize; 526 dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1); 527 sblk.b_bno = super / dev_bsize; 528 529 if (bflag) { 530 havesb = 1; 531 return (1); 532 } 533 /* 534 * Set all possible fields that could differ, then do check 535 * of whole super block against an alternate super block. 536 * When an alternate super-block is specified this check is skipped. 537 */ 538 getblk(&asblk, cgsblock(sblock, sblock->fs_ncg - 1), sblock->fs_sbsize); 539 if (asblk.b_errs) 540 return (0); 541 /* swap SB byte order if asked */ 542 if (doswap) 543 ffs_sb_swap(asblk.b_un.b_fs, asblk.b_un.b_fs, needswap); 544 545 memmove(altsblock, asblk.b_un.b_fs, sblock->fs_sbsize); 546 if (needswap) 547 ffs_sb_swap(asblk.b_un.b_fs, altsblock, 0); 548 altsblock->fs_firstfield = sblock->fs_firstfield; 549 altsblock->fs_fscktime = sblock->fs_fscktime; 550 altsblock->fs_unused_1 = sblock->fs_unused_1; 551 altsblock->fs_time = sblock->fs_time; 552 altsblock->fs_cstotal = sblock->fs_cstotal; 553 altsblock->fs_cgrotor = sblock->fs_cgrotor; 554 altsblock->fs_fmod = sblock->fs_fmod; 555 altsblock->fs_clean = sblock->fs_clean; 556 altsblock->fs_ronly = sblock->fs_ronly; 557 altsblock->fs_flags = sblock->fs_flags; 558 altsblock->fs_maxcontig = sblock->fs_maxcontig; 559 altsblock->fs_minfree = sblock->fs_minfree; 560 altsblock->fs_optim = sblock->fs_optim; 561 altsblock->fs_rotdelay = sblock->fs_rotdelay; 562 altsblock->fs_maxbpg = sblock->fs_maxbpg; 563 memmove(altsblock->fs_csp, sblock->fs_csp, sizeof sblock->fs_csp); 564 altsblock->fs_maxcluster = sblock->fs_maxcluster; 565 memmove(altsblock->fs_fsmnt, sblock->fs_fsmnt, sizeof sblock->fs_fsmnt); 566 memmove(altsblock->fs_sparecon, 567 sblock->fs_sparecon, sizeof sblock->fs_sparecon); 568 /* 569 * The following should not have to be copied. 570 */ 571 altsblock->fs_fsbtodb = sblock->fs_fsbtodb; 572 altsblock->fs_interleave = sblock->fs_interleave; 573 altsblock->fs_npsect = sblock->fs_npsect; 574 altsblock->fs_nrpos = sblock->fs_nrpos; 575 altsblock->fs_state = sblock->fs_state; 576 altsblock->fs_qbmask = sblock->fs_qbmask; 577 altsblock->fs_qfmask = sblock->fs_qfmask; 578 altsblock->fs_state = sblock->fs_state; 579 altsblock->fs_maxfilesize = sblock->fs_maxfilesize; 580 if (memcmp(sblock, altsblock, (int)sblock->fs_sbsize)) { 581 if (debug) { 582 long *nlp, *olp, *endlp; 583 584 printf("superblock mismatches\n"); 585 nlp = (long *)altsblock; 586 olp = (long *)sblock; 587 endlp = olp + (sblock->fs_sbsize / sizeof *olp); 588 for ( ; olp < endlp; olp++, nlp++) { 589 if (*olp == *nlp) 590 continue; 591 printf("offset %ld, original %lx, alternate %lx\n", 592 (long)(olp - (long *)sblock), *olp, *nlp); 593 } 594 } 595 badsb(listerr, 596 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 597 return (0); 598 } 599 /* Now we know the SB is valid, we can write it back if needed */ 600 if (doswap) { 601 sbdirty(); 602 dirty(&asblk); 603 } 604 havesb = 1; 605 return (1); 606 } 607 608 static void 609 badsb(listerr, s) 610 int listerr; 611 char *s; 612 { 613 614 if (!listerr) 615 return; 616 if (preen) 617 printf("%s: ", cdevname()); 618 pfatal("BAD SUPER BLOCK: %s\n", s); 619 } 620 621 /* 622 * Calculate a prototype superblock based on information in the disk label. 623 * When done the cgsblock macro can be calculated and the fs_ncg field 624 * can be used. Do NOT attempt to use other macros without verifying that 625 * their needed information is available! 626 */ 627 static int 628 calcsb(dev, devfd, fs) 629 const char *dev; 630 int devfd; 631 struct fs *fs; 632 { 633 struct disklabel *lp; 634 struct partition *pp; 635 char *cp; 636 int i; 637 638 cp = strchr(dev, '\0') - 1; 639 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 640 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 641 return (0); 642 } 643 lp = getdisklabel(dev, devfd); 644 if (isdigit(*cp)) 645 pp = &lp->d_partitions[0]; 646 else 647 pp = &lp->d_partitions[*cp - 'a']; 648 if (pp->p_fstype != FS_BSDFFS) { 649 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 650 dev, pp->p_fstype < FSMAXTYPES ? 651 fstypenames[pp->p_fstype] : "unknown"); 652 return (0); 653 } 654 /* avoid divide by 0 */ 655 if (pp->p_fsize == 0 || pp->p_frag == 0) 656 return (0); 657 memset(fs, 0, sizeof(struct fs)); 658 fs->fs_fsize = pp->p_fsize; 659 fs->fs_frag = pp->p_frag; 660 fs->fs_cpg = pp->p_cpg; 661 fs->fs_size = pp->p_size; 662 fs->fs_ntrak = lp->d_ntracks; 663 fs->fs_nsect = lp->d_nsectors; 664 fs->fs_spc = lp->d_secpercyl; 665 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 666 fs->fs_sblkno = roundup( 667 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 668 fs->fs_frag); 669 fs->fs_cgmask = 0xffffffff; 670 for (i = fs->fs_ntrak; i > 1; i >>= 1) 671 fs->fs_cgmask <<= 1; 672 if (!POWEROF2(fs->fs_ntrak)) 673 fs->fs_cgmask <<= 1; 674 fs->fs_cgoffset = roundup( 675 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 676 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 677 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 678 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 679 fs->fs_fsbtodb++; 680 dev_bsize = lp->d_secsize; 681 return (1); 682 } 683 684 static struct disklabel * 685 getdisklabel(s, fd) 686 const char *s; 687 int fd; 688 { 689 static struct disklabel lab; 690 691 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 692 if (s == NULL) 693 return ((struct disklabel *)NULL); 694 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 695 errx(EEXIT, "%s: can't read disk label", s); 696 } 697 return (&lab); 698 } 699
Indexes created Wed Sep 24 05:09:52 GMT 2025