1 /* $NetBSD: setup.c,v 1.40 2001/01/09 06:05:10 mycroft 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 1.40 2001/01/09 06:05:10 mycroft 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 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 142 return(0); 143 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 144 return (0); 145 for (cg = 0; cg < proto.fs_ncg; cg++) { 146 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 147 if (readsb(0) != 0) 148 break; 149 } 150 if (cg >= proto.fs_ncg) { 151 printf("%s %s\n%s %s\n%s %s\n", 152 "SEARCH FOR ALTERNATE SUPER-BLOCK", 153 "FAILED. YOU MUST USE THE", 154 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 155 "LOCATION OF AN ALTERNATE", 156 "SUPER-BLOCK TO SUPPLY NEEDED", 157 "INFORMATION; SEE fsck_ffs(8)."); 158 return(0); 159 } 160 doskipclean = 0; 161 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 162 } 163 if (debug) 164 printf("clean = %d\n", sblock->fs_clean); 165 if (doswap) 166 doskipclean = 0; 167 if (sblock->fs_clean & FS_ISCLEAN) { 168 if (doskipclean) { 169 pwarn("%sile system is clean; not checking\n", 170 preen ? "f" : "** F"); 171 return (-1); 172 } 173 if (!preen && !doswap) 174 pwarn("** File system is already clean\n"); 175 } 176 maxfsblock = sblock->fs_size; 177 maxino = sblock->fs_ncg * sblock->fs_ipg; 178 sizepb = sblock->fs_bsize; 179 maxfilesize = sblock->fs_bsize * NDADDR - 1; 180 for (i = 0; i < NIADDR; i++) { 181 sizepb *= NINDIR(sblock); 182 maxfilesize += sizepb; 183 } 184 /* 185 * Check and potentially fix certain fields in the super block. 186 */ 187 if (sblock->fs_optim != FS_OPTTIME && sblock->fs_optim != FS_OPTSPACE) { 188 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 189 if (reply("SET TO DEFAULT") == 1) { 190 sblock->fs_optim = FS_OPTTIME; 191 sbdirty(); 192 } 193 } 194 if ((sblock->fs_minfree < 0 || sblock->fs_minfree > 99)) { 195 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 196 sblock->fs_minfree); 197 if (reply("SET TO DEFAULT") == 1) { 198 sblock->fs_minfree = 10; 199 sbdirty(); 200 } 201 } 202 if (sblock->fs_interleave < 1 || 203 sblock->fs_interleave > sblock->fs_nsect) { 204 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 205 sblock->fs_interleave); 206 sblock->fs_interleave = 1; 207 if (preen) 208 printf(" (FIXED)\n"); 209 if (preen || reply("SET TO DEFAULT") == 1) { 210 sbdirty(); 211 dirty(&asblk); 212 } 213 } 214 if (sblock->fs_npsect < sblock->fs_nsect || 215 sblock->fs_npsect > sblock->fs_nsect*2) { 216 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 217 sblock->fs_npsect); 218 sblock->fs_npsect = sblock->fs_nsect; 219 if (preen) 220 printf(" (FIXED)\n"); 221 if (preen || reply("SET TO DEFAULT") == 1) { 222 sbdirty(); 223 dirty(&asblk); 224 } 225 } 226 if (sblock->fs_bmask != ~(sblock->fs_bsize - 1)) { 227 pwarn("INCORRECT BMASK=0x%x IN SUPERBLOCK", 228 sblock->fs_bmask); 229 sblock->fs_bmask = ~(sblock->fs_bsize - 1); 230 if (preen) 231 printf(" (FIXED)\n"); 232 if (preen || reply("FIX") == 1) { 233 sbdirty(); 234 dirty(&asblk); 235 } 236 } 237 if (sblock->fs_fmask != ~(sblock->fs_fsize - 1)) { 238 pwarn("INCORRECT FMASK=0x%x IN SUPERBLOCK", 239 sblock->fs_fmask); 240 sblock->fs_fmask = ~(sblock->fs_fsize - 1); 241 if (preen) 242 printf(" (FIXED)\n"); 243 if (preen || reply("FIX") == 1) { 244 sbdirty(); 245 dirty(&asblk); 246 } 247 } 248 if (sblock->fs_inodefmt >= FS_44INODEFMT) { 249 if (sblock->fs_maxfilesize != maxfilesize) { 250 pwarn("INCORRECT MAXFILESIZE=%lld IN SUPERBLOCK", 251 (unsigned long long)sblock->fs_maxfilesize); 252 sblock->fs_maxfilesize = maxfilesize; 253 if (preen) 254 printf(" (FIXED)\n"); 255 if (preen || reply("FIX") == 1) { 256 sbdirty(); 257 dirty(&asblk); 258 } 259 } 260 if (sblock->fs_maxsymlinklen != MAXSYMLINKLEN) { 261 pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", 262 sblock->fs_maxsymlinklen); 263 sblock->fs_maxsymlinklen = MAXSYMLINKLEN; 264 if (preen) 265 printf(" (FIXED)\n"); 266 if (preen || reply("FIX") == 1) { 267 sbdirty(); 268 dirty(&asblk); 269 } 270 } 271 if (sblock->fs_qbmask != ~sblock->fs_bmask) { 272 pwarn("INCORRECT QBMASK=%llx IN SUPERBLOCK", 273 (unsigned long long)sblock->fs_qbmask); 274 sblock->fs_qbmask = ~sblock->fs_bmask; 275 if (preen) 276 printf(" (FIXED)\n"); 277 if (preen || reply("FIX") == 1) { 278 sbdirty(); 279 dirty(&asblk); 280 } 281 } 282 if (sblock->fs_qfmask != ~sblock->fs_fmask) { 283 pwarn("INCORRECT QFMASK=%llx IN SUPERBLOCK", 284 (unsigned long long)sblock->fs_qfmask); 285 sblock->fs_qfmask = ~sblock->fs_fmask; 286 if (preen) 287 printf(" (FIXED)\n"); 288 if (preen || reply("FIX") == 1) { 289 sbdirty(); 290 dirty(&asblk); 291 } 292 } 293 newinofmt = 1; 294 } else { 295 sblock->fs_qbmask = ~sblock->fs_bmask; 296 sblock->fs_qfmask = ~sblock->fs_fmask; 297 newinofmt = 0; 298 } 299 /* 300 * Convert to new inode format. 301 */ 302 if (cvtlevel >= 2 && sblock->fs_inodefmt < FS_44INODEFMT) { 303 if (preen) 304 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 305 else if (!reply("CONVERT TO NEW INODE FORMAT")) 306 return(0); 307 doinglevel2++; 308 sblock->fs_inodefmt = FS_44INODEFMT; 309 sblock->fs_maxfilesize = maxfilesize; 310 sblock->fs_maxsymlinklen = MAXSYMLINKLEN; 311 sblock->fs_qbmask = ~sblock->fs_bmask; 312 sblock->fs_qfmask = ~sblock->fs_fmask; 313 sbdirty(); 314 dirty(&asblk); 315 } 316 /* 317 * Convert to new cylinder group format. 318 */ 319 if (cvtlevel >= 1 && sblock->fs_postblformat == FS_42POSTBLFMT) { 320 if (preen) 321 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 322 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 323 return(0); 324 doinglevel1++; 325 sblock->fs_postblformat = FS_DYNAMICPOSTBLFMT; 326 sblock->fs_nrpos = 8; 327 sblock->fs_postbloff = 328 (char *)(&sblock->fs_opostbl[0][0]) - 329 (char *)(&sblock->fs_firstfield); 330 sblock->fs_rotbloff = &sblock->fs_space[0] - 331 (u_char *)(&sblock->fs_firstfield); 332 sblock->fs_cgsize = 333 fragroundup(sblock, CGSIZE(sblock)); 334 sbdirty(); 335 dirty(&asblk); 336 } 337 if (asblk.b_dirty && !bflag) { 338 memmove((struct fs*)sblk.b_un.b_fs, sblock, SBSIZE); 339 if (needswap) 340 ffs_sb_swap(sblock, (struct fs*)sblk.b_un.b_fs, 1); 341 memmove(asblk.b_un.b_fs, sblk.b_un.b_fs, (size_t)sblock->fs_sbsize); 342 flush(fswritefd, &asblk); 343 } 344 /* 345 * read in the summary info. 346 */ 347 asked = 0; 348 for (i = 0, j = 0; i < sblock->fs_cssize; i += sblock->fs_bsize, j++) { 349 size = sblock->fs_cssize - i < sblock->fs_bsize ? 350 sblock->fs_cssize - i : sblock->fs_bsize; 351 sblock->fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 352 if (bread(fsreadfd, (char *)sblock->fs_csp[j], 353 fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag), 354 size) != 0 && !asked) { 355 pfatal("BAD SUMMARY INFORMATION"); 356 if (reply("CONTINUE") == 0) { 357 markclean = 0; 358 exit(EEXIT); 359 } 360 asked++; 361 } 362 /* 363 * The following assumes that struct csum is made of 364 * u_int32_t 365 */ 366 if (doswap) { 367 int k; 368 u_int32_t *cd = (u_int32_t *)sblock->fs_csp[j]; 369 370 for (k = 0; k < size / sizeof(u_int32_t); k++) 371 cd[k] = bswap32(cd[k]); 372 bwrite(fswritefd, (char *)sblock->fs_csp[j], 373 fsbtodb(sblock, 374 sblock->fs_csaddr + j * sblock->fs_frag), 375 size); 376 } 377 if (needswap) { 378 int k; 379 u_int32_t *cd = (u_int32_t *)sblock->fs_csp[j]; 380 381 for (k = 0; k < size / sizeof(u_int32_t); k++) 382 cd[k] = bswap32(cd[k]); 383 } 384 } 385 /* 386 * allocate and initialize the necessary maps 387 */ 388 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 389 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 390 if (blockmap == NULL) { 391 printf("cannot alloc %u bytes for blockmap\n", 392 (unsigned)bmapsize); 393 goto badsblabel; 394 } 395 statemap = calloc((unsigned)(maxino + 1), sizeof(char)); 396 if (statemap == NULL) { 397 printf("cannot alloc %u bytes for statemap\n", 398 (unsigned)(maxino + 1)); 399 goto badsblabel; 400 } 401 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 402 if (typemap == NULL) { 403 printf("cannot alloc %u bytes for typemap\n", 404 (unsigned)(maxino + 1)); 405 goto badsblabel; 406 } 407 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 408 if (lncntp == NULL) { 409 printf("cannot alloc %u bytes for lncntp\n", 410 (unsigned)((maxino + 1) * sizeof(int16_t))); 411 goto badsblabel; 412 } 413 /* 414 * cs_ndir may be inaccurate, particularly if we're using the -b 415 * option, so set a minimum to prevent bogus subdirectory reconnects 416 * and really inefficient directory scans. 417 * Also set a maximum in case the value is too large. 418 */ 419 numdirs = sblock->fs_cstotal.cs_ndir; 420 if (numdirs < 1024) 421 numdirs = 1024; 422 if (numdirs > maxino + 1) 423 numdirs = maxino + 1; 424 inplast = 0; 425 listmax = numdirs + 10; 426 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 427 sizeof(struct inoinfo *)); 428 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 429 sizeof(struct inoinfo *)); 430 if (inpsort == NULL || inphead == NULL) { 431 printf("cannot alloc %u bytes for inphead\n", 432 (unsigned)(numdirs * sizeof(struct inoinfo *))); 433 goto badsblabel; 434 } 435 cgrp = malloc(sblock->fs_cgsize); 436 if (cgrp == NULL) { 437 printf("cannot alloc %u bytes for cylinder group\n", 438 sblock->fs_cgsize); 439 goto badsblabel; 440 } 441 bufinit(); 442 if (sblock->fs_flags & FS_DOSOFTDEP) 443 usedsoftdep = 1; 444 else 445 usedsoftdep = 0; 446 return (1); 447 448 badsblabel: 449 markclean=0; 450 ckfini(); 451 return (0); 452 } 453 454 /* 455 * Read in the super block and its summary info. 456 */ 457 static int 458 readsb(listerr) 459 int listerr; 460 { 461 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 462 struct fs *fs; 463 464 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 465 return (0); 466 sblk.b_bno = super; 467 sblk.b_size = SBSIZE; 468 469 fs = sblk.b_un.b_fs; 470 /* auto detect byte order */ 471 if( fs->fs_magic == FS_MAGIC) { 472 if (endian == 0 || BYTE_ORDER == endian) { 473 needswap = 0; 474 doswap = do_blkswap = do_dirswap = 0; 475 } else { 476 needswap = 1; 477 doswap = do_blkswap = do_dirswap = 1; 478 } 479 } else if (fs->fs_magic == bswap32(FS_MAGIC)) { 480 if (endian == 0 || BYTE_ORDER != endian) { 481 needswap = 1; 482 doswap = do_blkswap = do_dirswap = 0; 483 } else { 484 needswap = 0; 485 doswap = do_blkswap = do_dirswap = 1; 486 } 487 } else { 488 badsb(listerr, "MAGIC NUMBER WRONG"); 489 return (0); 490 } 491 if (doswap) { 492 if (preen) 493 errx(EEXIT, "incompatible options -B and -p"); 494 if (nflag) 495 errx(EEXIT, "incompatible options -B and -n"); 496 if (endian == LITTLE_ENDIAN) { 497 if (!reply("CONVERT TO LITTLE ENDIAN")) 498 return 0; 499 } else if (endian == BIG_ENDIAN) { 500 if (!reply("CONVERT TO BIG ENDIAN")) 501 return 0; 502 } else 503 pfatal("INTERNAL ERROR: unknown endian"); 504 } 505 if (needswap) 506 printf("** Swapped byte order\n"); 507 /* swap SB byte order if asked */ 508 if (doswap) 509 ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs, needswap); 510 511 memmove(sblock, sblk.b_un.b_fs, SBSIZE); 512 if (needswap) 513 ffs_sb_swap(sblk.b_un.b_fs, sblock, 0); 514 515 /* 516 * run a few consistency checks of the super block 517 */ 518 if (sblock->fs_ncg < 1) 519 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 520 if (sblock->fs_cpg < 1) 521 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 522 if (sblock->fs_ncg * sblock->fs_cpg < sblock->fs_ncyl || 523 (sblock->fs_ncg - 1) * sblock->fs_cpg >= sblock->fs_ncyl) 524 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 525 if (sblock->fs_sbsize > SBSIZE) 526 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 527 /* 528 * Compute block size that the filesystem is based on, 529 * according to fsbtodb, and adjust superblock block number 530 * so we can tell if this is an alternate later. 531 */ 532 super *= dev_bsize; 533 dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1); 534 sblk.b_bno = super / dev_bsize; 535 536 if (bflag) { 537 havesb = 1; 538 return (1); 539 } 540 /* 541 * Set all possible fields that could differ, then do check 542 * of whole super block against an alternate super block. 543 * When an alternate super-block is specified this check is skipped. 544 */ 545 getblk(&asblk, cgsblock(sblock, sblock->fs_ncg - 1), sblock->fs_sbsize); 546 if (asblk.b_errs) 547 return (0); 548 /* swap SB byte order if asked */ 549 if (doswap) 550 ffs_sb_swap(asblk.b_un.b_fs, asblk.b_un.b_fs, needswap); 551 552 memmove(altsblock, asblk.b_un.b_fs, sblock->fs_sbsize); 553 if (needswap) 554 ffs_sb_swap(asblk.b_un.b_fs, altsblock, 0); 555 altsblock->fs_firstfield = sblock->fs_firstfield; 556 altsblock->fs_fscktime = sblock->fs_fscktime; 557 altsblock->fs_unused_1 = sblock->fs_unused_1; 558 altsblock->fs_time = sblock->fs_time; 559 altsblock->fs_cstotal = sblock->fs_cstotal; 560 altsblock->fs_cgrotor = sblock->fs_cgrotor; 561 altsblock->fs_fmod = sblock->fs_fmod; 562 altsblock->fs_clean = sblock->fs_clean; 563 altsblock->fs_ronly = sblock->fs_ronly; 564 altsblock->fs_flags = sblock->fs_flags; 565 altsblock->fs_maxcontig = sblock->fs_maxcontig; 566 altsblock->fs_minfree = sblock->fs_minfree; 567 altsblock->fs_optim = sblock->fs_optim; 568 altsblock->fs_rotdelay = sblock->fs_rotdelay; 569 altsblock->fs_maxbpg = sblock->fs_maxbpg; 570 memmove(altsblock->fs_csp, sblock->fs_csp, sizeof sblock->fs_csp); 571 altsblock->fs_maxcluster = sblock->fs_maxcluster; 572 memmove(altsblock->fs_fsmnt, sblock->fs_fsmnt, sizeof sblock->fs_fsmnt); 573 memmove(altsblock->fs_sparecon, 574 sblock->fs_sparecon, sizeof sblock->fs_sparecon); 575 /* 576 * The following should not have to be copied. 577 */ 578 altsblock->fs_fsbtodb = sblock->fs_fsbtodb; 579 altsblock->fs_interleave = sblock->fs_interleave; 580 altsblock->fs_npsect = sblock->fs_npsect; 581 altsblock->fs_nrpos = sblock->fs_nrpos; 582 altsblock->fs_state = sblock->fs_state; 583 altsblock->fs_qbmask = sblock->fs_qbmask; 584 altsblock->fs_qfmask = sblock->fs_qfmask; 585 altsblock->fs_state = sblock->fs_state; 586 altsblock->fs_maxfilesize = sblock->fs_maxfilesize; 587 if (memcmp(sblock, altsblock, (int)sblock->fs_sbsize)) { 588 if (debug) { 589 long *nlp, *olp, *endlp; 590 591 printf("superblock mismatches\n"); 592 nlp = (long *)altsblock; 593 olp = (long *)sblock; 594 endlp = olp + (sblock->fs_sbsize / sizeof *olp); 595 for ( ; olp < endlp; olp++, nlp++) { 596 if (*olp == *nlp) 597 continue; 598 printf("offset %ld, original %lx, alternate %lx\n", 599 (long)(olp - (long *)sblock), *olp, *nlp); 600 } 601 } 602 badsb(listerr, 603 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 604 return (0); 605 } 606 /* Now we know the SB is valid, we can write it back if needed */ 607 if (doswap) { 608 sbdirty(); 609 dirty(&asblk); 610 } 611 havesb = 1; 612 return (1); 613 } 614 615 static void 616 badsb(listerr, s) 617 int listerr; 618 char *s; 619 { 620 621 if (!listerr) 622 return; 623 if (preen) 624 printf("%s: ", cdevname()); 625 pfatal("BAD SUPER BLOCK: %s\n", s); 626 } 627 628 /* 629 * Calculate a prototype superblock based on information in the disk label. 630 * When done the cgsblock macro can be calculated and the fs_ncg field 631 * can be used. Do NOT attempt to use other macros without verifying that 632 * their needed information is available! 633 */ 634 static int 635 calcsb(dev, devfd, fs) 636 const char *dev; 637 int devfd; 638 struct fs *fs; 639 { 640 struct disklabel *lp; 641 struct partition *pp; 642 char *cp; 643 int i; 644 645 cp = strchr(dev, '\0') - 1; 646 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 647 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 648 return (0); 649 } 650 lp = getdisklabel(dev, devfd); 651 if (isdigit(*cp)) 652 pp = &lp->d_partitions[0]; 653 else 654 pp = &lp->d_partitions[*cp - 'a']; 655 if (pp->p_fstype != FS_BSDFFS) { 656 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 657 dev, pp->p_fstype < FSMAXTYPES ? 658 fstypenames[pp->p_fstype] : "unknown"); 659 return (0); 660 } 661 /* avoid divide by 0 */ 662 if (pp->p_fsize == 0 || pp->p_frag == 0) 663 return (0); 664 memset(fs, 0, sizeof(struct fs)); 665 fs->fs_fsize = pp->p_fsize; 666 fs->fs_frag = pp->p_frag; 667 fs->fs_cpg = pp->p_cpg; 668 fs->fs_size = pp->p_size; 669 fs->fs_ntrak = lp->d_ntracks; 670 fs->fs_nsect = lp->d_nsectors; 671 fs->fs_spc = lp->d_secpercyl; 672 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 673 fs->fs_sblkno = roundup( 674 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 675 fs->fs_frag); 676 fs->fs_cgmask = 0xffffffff; 677 for (i = fs->fs_ntrak; i > 1; i >>= 1) 678 fs->fs_cgmask <<= 1; 679 if (!POWEROF2(fs->fs_ntrak)) 680 fs->fs_cgmask <<= 1; 681 fs->fs_cgoffset = roundup( 682 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 683 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 684 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 685 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 686 fs->fs_fsbtodb++; 687 dev_bsize = lp->d_secsize; 688 return (1); 689 } 690 691 static struct disklabel * 692 getdisklabel(s, fd) 693 const char *s; 694 int fd; 695 { 696 static struct disklabel lab; 697 698 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 699 if (s == NULL) 700 return ((struct disklabel *)NULL); 701 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 702 errx(EEXIT, "%s: can't read disk label", s); 703 } 704 return (&lab); 705 } 706