setup.c revision 1.62
1 /* $NetBSD: setup.c,v 1.62 2003/08/07 10:04:21 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; 36 #else 37 __RCSID("$NetBSD: setup.c,v 1.62 2003/08/07 10:04:21 agc Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/time.h> 43 #include <sys/stat.h> 44 #include <sys/ioctl.h> 45 #define FSTYPENAMES 46 #include <sys/disklabel.h> 47 #include <sys/file.h> 48 49 #include <ufs/ufs/dinode.h> 50 #include <ufs/ufs/dir.h> 51 #include <ufs/ufs/ufs_bswap.h> 52 #include <ufs/ffs/fs.h> 53 #include <ufs/ffs/ffs_extern.h> 54 55 #include <ctype.h> 56 #include <err.h> 57 #include <errno.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 62 #include "fsck.h" 63 #include "extern.h" 64 #include "fsutil.h" 65 66 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 67 68 static void badsb __P((int, char *)); 69 static int calcsb __P((const char *, int, struct fs *)); 70 static struct disklabel *getdisklabel __P((const char *, int)); 71 static struct partition *getdisklabelpart __P((const char *, struct disklabel *)); 72 static int readsb __P((int)); 73 static int readappleufs __P((void)); 74 75 /* 76 * Read in a superblock finding an alternate if necessary. 77 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 78 * is already clean (preen mode only). 79 */ 80 int 81 setup(dev) 82 const char *dev; 83 { 84 long cg, size, asked, i, j; 85 long bmapsize; 86 struct disklabel *lp; 87 off_t sizepb; 88 struct stat statb; 89 struct fs proto; 90 int doskipclean; 91 u_int64_t maxfilesize; 92 struct csum *ccsp; 93 94 havesb = 0; 95 fswritefd = -1; 96 doskipclean = skipclean; 97 if (stat(dev, &statb) < 0) { 98 printf("Can't stat %s: %s\n", dev, strerror(errno)); 99 return (0); 100 } 101 if (!forceimage && !S_ISCHR(statb.st_mode)) { 102 pfatal("%s is not a character device", dev); 103 if (reply("CONTINUE") == 0) 104 return (0); 105 } 106 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 107 printf("Can't open %s: %s\n", dev, strerror(errno)); 108 return (0); 109 } 110 if (preen == 0) 111 printf("** %s", dev); 112 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 113 fswritefd = -1; 114 if (preen) 115 pfatal("NO WRITE ACCESS"); 116 printf(" (NO WRITE)"); 117 } 118 if (preen == 0) 119 printf("\n"); 120 fsmodified = 0; 121 lfdir = 0; 122 initbarea(&sblk); 123 initbarea(&asblk); 124 sblk.b_un.b_buf = malloc(SBLOCKSIZE); 125 sblock = malloc(SBLOCKSIZE); 126 asblk.b_un.b_buf = malloc(SBLOCKSIZE); 127 altsblock = malloc(SBLOCKSIZE); 128 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL || 129 sblock == NULL || altsblock == NULL) 130 errx(EEXIT, "cannot allocate space for superblock"); 131 if (!forceimage && (lp = getdisklabel(NULL, fsreadfd)) != NULL) 132 dev_bsize = secsize = lp->d_secsize; 133 else 134 dev_bsize = secsize = DEV_BSIZE; 135 /* 136 * Read in the superblock, looking for alternates if necessary 137 */ 138 if (readsb(1) == 0) { 139 if (bflag || preen || forceimage || 140 calcsb(dev, fsreadfd, &proto) == 0) 141 return(0); 142 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 143 return (0); 144 for (cg = 0; cg < proto.fs_ncg; cg++) { 145 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 146 if (readsb(0) != 0) 147 break; 148 } 149 if (cg >= proto.fs_ncg) { 150 printf("%s %s\n%s %s\n%s %s\n", 151 "SEARCH FOR ALTERNATE SUPER-BLOCK", 152 "FAILED. YOU MUST USE THE", 153 "-b OPTION TO fsck_ffs TO SPECIFY THE", 154 "LOCATION OF AN ALTERNATE", 155 "SUPER-BLOCK TO SUPPLY NEEDED", 156 "INFORMATION; SEE fsck_ffs(8)."); 157 return(0); 158 } 159 doskipclean = 0; 160 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 161 } 162 if (debug) 163 printf("clean = %d\n", sblock->fs_clean); 164 if (doswap) 165 doskipclean = 0; 166 if (sblock->fs_old_postblformat == FS_42POSTBLFMT) { 167 pwarn("%sile system is in 4.2BSD format, check skipped\n", 168 preen ? "f" : "** F"); 169 return -1; 170 } 171 if (sblock->fs_clean & FS_ISCLEAN) { 172 if (doskipclean) { 173 pwarn("%sile system is clean; not checking\n", 174 preen ? "f" : "** F"); 175 return (-1); 176 } 177 if (!preen && !doswap) 178 pwarn("** File system is already clean\n"); 179 } 180 maxfsblock = sblock->fs_size; 181 maxino = sblock->fs_ncg * sblock->fs_ipg; 182 sizepb = sblock->fs_bsize; 183 maxfilesize = sblock->fs_bsize * NDADDR - 1; 184 for (i = 0; i < NIADDR; i++) { 185 sizepb *= NINDIR(sblock); 186 maxfilesize += sizepb; 187 } 188 /* 189 * Check and potentially fix certain fields in the super block. 190 */ 191 if (sblock->fs_optim != FS_OPTTIME && sblock->fs_optim != FS_OPTSPACE) { 192 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 193 if (reply("SET TO DEFAULT") == 1) { 194 sblock->fs_optim = FS_OPTTIME; 195 sbdirty(); 196 } 197 } 198 if ((sblock->fs_minfree < 0 || sblock->fs_minfree > 99)) { 199 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 200 sblock->fs_minfree); 201 if (reply("SET TO DEFAULT") == 1) { 202 sblock->fs_minfree = 10; 203 sbdirty(); 204 } 205 } 206 if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && 207 (sblock->fs_old_interleave < 1 || 208 sblock->fs_old_interleave > sblock->fs_old_nsect)) { 209 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 210 sblock->fs_old_interleave); 211 sblock->fs_old_interleave = 1; 212 if (preen) 213 printf(" (FIXED)\n"); 214 if (preen || reply("SET TO DEFAULT") == 1) { 215 sbdirty(); 216 dirty(&asblk); 217 } 218 } 219 if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && 220 (sblock->fs_old_npsect < sblock->fs_old_nsect || 221 sblock->fs_old_npsect > sblock->fs_old_nsect*2)) { 222 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 223 sblock->fs_old_npsect); 224 sblock->fs_old_npsect = sblock->fs_old_nsect; 225 if (preen) 226 printf(" (FIXED)\n"); 227 if (preen || reply("SET TO DEFAULT") == 1) { 228 sbdirty(); 229 dirty(&asblk); 230 } 231 } 232 if (sblock->fs_bmask != ~(sblock->fs_bsize - 1)) { 233 pwarn("INCORRECT BMASK=0x%x IN SUPERBLOCK", 234 sblock->fs_bmask); 235 sblock->fs_bmask = ~(sblock->fs_bsize - 1); 236 if (preen) 237 printf(" (FIXED)\n"); 238 if (preen || reply("FIX") == 1) { 239 sbdirty(); 240 dirty(&asblk); 241 } 242 } 243 if (sblock->fs_fmask != ~(sblock->fs_fsize - 1)) { 244 pwarn("INCORRECT FMASK=0x%x IN SUPERBLOCK", 245 sblock->fs_fmask); 246 sblock->fs_fmask = ~(sblock->fs_fsize - 1); 247 if (preen) 248 printf(" (FIXED)\n"); 249 if (preen || reply("FIX") == 1) { 250 sbdirty(); 251 dirty(&asblk); 252 } 253 } 254 if (sblock->fs_old_inodefmt >= FS_44INODEFMT) { 255 if (sblock->fs_maxfilesize != maxfilesize) { 256 pwarn("INCORRECT MAXFILESIZE=%lld IN SUPERBLOCK", 257 (unsigned long long)sblock->fs_maxfilesize); 258 sblock->fs_maxfilesize = maxfilesize; 259 if (preen) 260 printf(" (FIXED)\n"); 261 if (preen || reply("FIX") == 1) { 262 sbdirty(); 263 dirty(&asblk); 264 } 265 } 266 if ((is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS2) 267 || 268 (!is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS1)) 269 { 270 pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", 271 sblock->fs_maxsymlinklen); 272 sblock->fs_maxsymlinklen = is_ufs2 ? 273 MAXSYMLINKLEN_UFS2 : MAXSYMLINKLEN_UFS1; 274 if (preen) 275 printf(" (FIXED)\n"); 276 if (preen || reply("FIX") == 1) { 277 sbdirty(); 278 dirty(&asblk); 279 } 280 } 281 if (sblock->fs_qbmask != ~sblock->fs_bmask) { 282 pwarn("INCORRECT QBMASK=%llx IN SUPERBLOCK", 283 (unsigned long long)sblock->fs_qbmask); 284 sblock->fs_qbmask = ~sblock->fs_bmask; 285 if (preen) 286 printf(" (FIXED)\n"); 287 if (preen || reply("FIX") == 1) { 288 sbdirty(); 289 dirty(&asblk); 290 } 291 } 292 if (sblock->fs_qfmask != ~sblock->fs_fmask) { 293 pwarn("INCORRECT QFMASK=%llx IN SUPERBLOCK", 294 (unsigned long long)sblock->fs_qfmask); 295 sblock->fs_qfmask = ~sblock->fs_fmask; 296 if (preen) 297 printf(" (FIXED)\n"); 298 if (preen || reply("FIX") == 1) { 299 sbdirty(); 300 dirty(&asblk); 301 } 302 } 303 newinofmt = 1; 304 } else { 305 sblock->fs_qbmask = ~sblock->fs_bmask; 306 sblock->fs_qfmask = ~sblock->fs_fmask; 307 newinofmt = 0; 308 } 309 /* 310 * Convert to new inode format. 311 */ 312 if (!is_ufs2 && cvtlevel >= 2 && 313 sblock->fs_old_inodefmt < FS_44INODEFMT) { 314 if (preen) 315 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 316 else if (!reply("CONVERT TO NEW INODE FORMAT")) 317 return(0); 318 doinglevel2++; 319 sblock->fs_old_inodefmt = FS_44INODEFMT; 320 sblock->fs_maxfilesize = maxfilesize; 321 sblock->fs_maxsymlinklen = MAXSYMLINKLEN_UFS1; 322 sblock->fs_qbmask = ~sblock->fs_bmask; 323 sblock->fs_qfmask = ~sblock->fs_fmask; 324 sbdirty(); 325 dirty(&asblk); 326 } 327 /* 328 * Convert to new cylinder group format. 329 */ 330 if (!is_ufs2 && cvtlevel >= 1 && 331 sblock->fs_old_postblformat == FS_42POSTBLFMT) { 332 if (preen) 333 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 334 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 335 return(0); 336 doinglevel1++; 337 sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT; 338 sblock->fs_old_nrpos = 0; 339 sbdirty(); 340 dirty(&asblk); 341 } 342 if (asblk.b_dirty && !bflag) { 343 memmove((struct fs*)sblk.b_un.b_fs, sblock, SBLOCKSIZE); 344 if (needswap) 345 ffs_sb_swap(sblock, (struct fs*)sblk.b_un.b_fs); 346 memmove(asblk.b_un.b_fs, sblk.b_un.b_fs, (size_t)sblock->fs_sbsize); 347 flush(fswritefd, &asblk); 348 } 349 /* 350 * read in the summary info. 351 */ 352 asked = 0; 353 sblock->fs_csp = (struct csum *)calloc(1, sblock->fs_cssize); 354 for (i = 0, j = 0; i < sblock->fs_cssize; i += sblock->fs_bsize, j++) { 355 size = sblock->fs_cssize - i < sblock->fs_bsize ? 356 sblock->fs_cssize - i : sblock->fs_bsize; 357 ccsp = (struct csum *)((char *)sblock->fs_csp + i); 358 if (bread(fsreadfd, (char *)ccsp, 359 fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag), 360 size) != 0 && !asked) { 361 pfatal("BAD SUMMARY INFORMATION"); 362 if (reply("CONTINUE") == 0) { 363 markclean = 0; 364 exit(EEXIT); 365 } 366 asked++; 367 } 368 if (doswap) { 369 ffs_csum_swap(ccsp, ccsp, size); 370 bwrite(fswritefd, (char *)ccsp, 371 fsbtodb(sblock, 372 sblock->fs_csaddr + j * sblock->fs_frag), 373 size); 374 } 375 if (needswap) 376 ffs_csum_swap(ccsp, ccsp, size); 377 } 378 /* 379 * allocate and initialize the necessary maps 380 */ 381 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 382 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 383 if (blockmap == NULL) { 384 printf("cannot alloc %u bytes for blockmap\n", 385 (unsigned)bmapsize); 386 goto badsblabel; 387 } 388 inostathead = calloc((unsigned)(sblock->fs_ncg), 389 sizeof(struct inostatlist)); 390 if (inostathead == NULL) { 391 printf("cannot alloc %u bytes for inostathead\n", 392 (unsigned)(sizeof(struct inostatlist) * (sblock->fs_ncg))); 393 goto badsblabel; 394 } 395 /* 396 * cs_ndir may be inaccurate, particularly if we're using the -b 397 * option, so set a minimum to prevent bogus subdirectory reconnects 398 * and really inefficient directory scans. 399 * Also set a maximum in case the value is too large. 400 */ 401 numdirs = sblock->fs_cstotal.cs_ndir; 402 if (numdirs < 1024) 403 numdirs = 1024; 404 if (numdirs > maxino + 1) 405 numdirs = maxino + 1; 406 dirhash = numdirs; 407 inplast = 0; 408 listmax = numdirs + 10; 409 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 410 sizeof(struct inoinfo *)); 411 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 412 sizeof(struct inoinfo *)); 413 if (inpsort == NULL || inphead == NULL) { 414 printf("cannot alloc %u bytes for inphead\n", 415 (unsigned)(numdirs * sizeof(struct inoinfo *))); 416 goto badsblabel; 417 } 418 cgrp = malloc(sblock->fs_cgsize); 419 if (cgrp == NULL) { 420 printf("cannot alloc %u bytes for cylinder group\n", 421 sblock->fs_cgsize); 422 goto badsblabel; 423 } 424 bufinit(); 425 if (sblock->fs_flags & FS_DOSOFTDEP) 426 usedsoftdep = 1; 427 else 428 usedsoftdep = 0; 429 430 { 431 struct partition *pp = 0; 432 if (!forceimage && lp) 433 pp = getdisklabelpart(dev,lp); 434 if (pp && (pp->p_fstype == FS_APPLEUFS)) { 435 isappleufs = 1; 436 } 437 } 438 if (readappleufs()) { 439 isappleufs = 1; 440 } 441 442 dirblksiz = DIRBLKSIZ; 443 if (isappleufs) 444 dirblksiz = APPLEUFS_DIRBLKSIZ; 445 446 if (debug) 447 printf("isappleufs = %d, dirblksiz = %d\n", isappleufs, dirblksiz); 448 449 return (1); 450 451 badsblabel: 452 markclean=0; 453 ckfini(); 454 return (0); 455 } 456 457 static int 458 readappleufs() 459 { 460 daddr_t label = APPLEUFS_LABEL_OFFSET / dev_bsize; 461 struct appleufslabel *appleufs; 462 int i; 463 464 /* XXX do we have to deal with APPLEUFS_LABEL_OFFSET not 465 * being block aligned (CD's?) 466 */ 467 if (bread(fsreadfd, (char *)appleufsblk.b_un.b_fs, label, (long)APPLEUFS_LABEL_SIZE) != 0) 468 return 0; 469 appleufsblk.b_bno = label; 470 appleufsblk.b_size = APPLEUFS_LABEL_SIZE; 471 472 appleufs = appleufsblk.b_un.b_appleufs; 473 474 if (ntohl(appleufs->ul_magic) != APPLEUFS_LABEL_MAGIC) { 475 if (!isappleufs) { 476 return 0; 477 } else { 478 pfatal("MISSING APPLEUFS VOLUME LABEL\n"); 479 if (reply("FIX") == 0) { 480 return 1; 481 } 482 ffs_appleufs_set(appleufs,NULL,-1); 483 appleufsdirty(); 484 } 485 } 486 487 if (ntohl(appleufs->ul_version) != APPLEUFS_LABEL_VERSION) { 488 pwarn("INCORRECT APPLE UFS VERSION NUMBER (%d should be %d)", 489 ntohl(appleufs->ul_version),APPLEUFS_LABEL_VERSION); 490 if (preen) { 491 printf(" (CORRECTED)\n"); 492 } 493 if (preen || reply("CORRECT")) { 494 appleufs->ul_version = htonl(APPLEUFS_LABEL_VERSION); 495 appleufsdirty(); 496 } 497 } 498 499 if (ntohs(appleufs->ul_namelen) > APPLEUFS_MAX_LABEL_NAME) { 500 pwarn("APPLE UFS LABEL NAME TOO LONG"); 501 if (preen) { 502 printf(" (TRUNCATED)\n"); 503 } 504 if (preen || reply("TRUNCATE")) { 505 appleufs->ul_namelen = htons(APPLEUFS_MAX_LABEL_NAME); 506 appleufsdirty(); 507 } 508 } 509 510 if (ntohs(appleufs->ul_namelen) == 0) { 511 pwarn("MISSING APPLE UFS LABEL NAME"); 512 if (preen) { 513 printf(" (FIXED)\n"); 514 } 515 if (preen || reply("FIX")) { 516 ffs_appleufs_set(appleufs,NULL,-1); 517 appleufsdirty(); 518 } 519 } 520 521 /* Scan name for first illegal character */ 522 for (i=0;i<ntohs(appleufs->ul_namelen);i++) { 523 if ((appleufs->ul_name[i] == '\0') || 524 (appleufs->ul_name[i] == ':') || 525 (appleufs->ul_name[i] == '/')) { 526 pwarn("APPLE UFS LABEL NAME CONTAINS ILLEGAL CHARACTER"); 527 if (preen) { 528 printf(" (TRUNCATED)\n"); 529 } 530 if (preen || reply("TRUNCATE")) { 531 appleufs->ul_namelen = i+1; 532 appleufsdirty(); 533 } 534 break; 535 } 536 } 537 538 /* Check the checksum last, because if anything else was wrong, 539 * then the checksum gets reset anyway. 540 */ 541 appleufs->ul_checksum = 0; 542 appleufs->ul_checksum = ffs_appleufs_cksum(appleufs); 543 if (appleufsblk.b_un.b_appleufs->ul_checksum != appleufs->ul_checksum) { 544 pwarn("INVALID APPLE UFS CHECKSUM (%#04x should be %#04x)", 545 appleufsblk.b_un.b_appleufs->ul_checksum, appleufs->ul_checksum); 546 if (preen) { 547 printf(" (CORRECTED)\n"); 548 } 549 if (preen || reply("CORRECT")) { 550 appleufsdirty(); 551 } else { 552 /* put the incorrect checksum back in place */ 553 appleufs->ul_checksum = appleufsblk.b_un.b_appleufs->ul_checksum; 554 } 555 } 556 return 1; 557 } 558 559 /* 560 * Detect byte order. Return 0 if valid magic found, -1 otherwise. 561 */ 562 static int 563 detect_byteorder(struct fs *fs) 564 { 565 if (fs->fs_magic == FS_UFS1_MAGIC || fs->fs_magic == FS_UFS2_MAGIC) { 566 if (endian == 0 || BYTE_ORDER == endian) { 567 needswap = 0; 568 doswap = do_blkswap = do_dirswap = 0; 569 } else { 570 needswap = 1; 571 doswap = do_blkswap = do_dirswap = 1; 572 } 573 return 0; 574 } else if (fs->fs_magic == bswap32(FS_UFS1_MAGIC) || 575 fs->fs_magic == bswap32(FS_UFS2_MAGIC)) { 576 if (endian == 0 || BYTE_ORDER != endian) { 577 needswap = 1; 578 doswap = do_blkswap = do_dirswap = 0; 579 } else { 580 needswap = 0; 581 doswap = do_blkswap = do_dirswap = 1; 582 } 583 return 0; 584 } 585 return -1; 586 } 587 588 /* 589 * Possible superblock locations ordered from most to least likely. 590 */ 591 static off_t sblock_try[] = SBLOCKSEARCH; 592 593 /* 594 * Read in the super block and its summary info. 595 */ 596 static int 597 readsb(listerr) 598 int listerr; 599 { 600 daddr_t super; 601 struct fs *fs; 602 int i; 603 604 if (bflag) { 605 super = bflag; 606 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, 607 (long)SBLOCKSIZE) != 0) 608 return (0); 609 fs = sblk.b_un.b_fs; 610 if (detect_byteorder(fs) < 0) { 611 badsb(listerr, "MAGIC NUMBER WRONG"); 612 return (0); 613 } 614 } else { 615 for (i = 0; sblock_try[i] != -1; i++) { 616 super = sblock_try[i] / dev_bsize; 617 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, 618 super, (long)SBLOCKSIZE) != 0) 619 continue; 620 fs = sblk.b_un.b_fs; 621 if (detect_byteorder(fs) == 0) 622 break; 623 } 624 if (sblock_try[i] == -1) { 625 badsb(listerr, "CAN'T FIND SUPERBLOCK"); 626 return (0); 627 } 628 } 629 if (doswap) { 630 if (preen) 631 errx(EEXIT, "incompatible options -B and -p"); 632 if (nflag) 633 errx(EEXIT, "incompatible options -B and -n"); 634 if (endian == LITTLE_ENDIAN) { 635 if (!reply("CONVERT TO LITTLE ENDIAN")) 636 return 0; 637 } else if (endian == BIG_ENDIAN) { 638 if (!reply("CONVERT TO BIG ENDIAN")) 639 return 0; 640 } else 641 pfatal("INTERNAL ERROR: unknown endian"); 642 } 643 if (needswap) 644 printf("** Swapped byte order\n"); 645 /* swap SB byte order if asked */ 646 if (doswap) 647 ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs); 648 649 memmove(sblock, sblk.b_un.b_fs, SBLOCKSIZE); 650 if (needswap) 651 ffs_sb_swap(sblk.b_un.b_fs, sblock); 652 653 is_ufs2 = sblock->fs_magic == FS_UFS2_MAGIC; 654 655 /* 656 * run a few consistency checks of the super block 657 */ 658 if (sblock->fs_sbsize > SBLOCKSIZE) 659 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 660 /* 661 * Compute block size that the filesystem is based on, 662 * according to fsbtodb, and adjust superblock block number 663 * so we can tell if this is an alternate later. 664 */ 665 super *= dev_bsize; 666 dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1); 667 sblk.b_bno = super / dev_bsize; 668 sblk.b_size = SBLOCKSIZE; 669 if (bflag) 670 goto out; 671 /* 672 * Set all possible fields that could differ, then do check 673 * of whole super block against an alternate super block-> 674 * When an alternate super-block is specified this check is skipped. 675 */ 676 getblk(&asblk, cgsblock(sblock, sblock->fs_ncg - 1), sblock->fs_sbsize); 677 if (asblk.b_errs) 678 return (0); 679 /* swap SB byte order if asked */ 680 if (doswap) 681 ffs_sb_swap(asblk.b_un.b_fs, asblk.b_un.b_fs); 682 683 memmove(altsblock, asblk.b_un.b_fs, sblock->fs_sbsize); 684 if (needswap) 685 ffs_sb_swap(asblk.b_un.b_fs, altsblock); 686 if (cmpsblks(sblock, altsblock)) { 687 badsb(listerr, 688 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 689 return (0); 690 } 691 out: 692 /* 693 * If not yet done, update UFS1 superblock with new wider fields. 694 */ 695 if (sblock->fs_magic == FS_UFS1_MAGIC) { 696 if (sblock->fs_maxbsize != sblock->fs_bsize || 697 sblock->fs_time < sblock->fs_old_time) { 698 sblock->fs_cstotal.cs_ndir = 699 sblock->fs_old_cstotal.cs_ndir; 700 sblock->fs_cstotal.cs_nbfree = 701 sblock->fs_old_cstotal.cs_nbfree; 702 sblock->fs_cstotal.cs_nifree = 703 sblock->fs_old_cstotal.cs_nifree; 704 sblock->fs_cstotal.cs_nffree = 705 sblock->fs_old_cstotal.cs_nffree; 706 } 707 if (sblock->fs_maxbsize != sblock->fs_bsize) { 708 sblock->fs_maxbsize = sblock->fs_bsize; 709 sblock->fs_time = sblock->fs_old_time; 710 sblock->fs_size = sblock->fs_old_size; 711 sblock->fs_dsize = sblock->fs_old_dsize; 712 sblock->fs_csaddr = sblock->fs_old_csaddr; 713 } 714 } 715 716 /* Now we know the SB is valid, we can write it back if needed */ 717 if (doswap) { 718 sbdirty(); 719 dirty(&asblk); 720 } 721 havesb = 1; 722 return (1); 723 } 724 725 int 726 cmpsblks(const struct fs *sb, struct fs *asb) 727 { 728 if (asb->fs_sblkno != sb->fs_sblkno || 729 asb->fs_cblkno != sb->fs_cblkno || 730 asb->fs_iblkno != sb->fs_iblkno || 731 asb->fs_dblkno != sb->fs_dblkno || 732 asb->fs_ncg != sb->fs_ncg || 733 asb->fs_bsize != sb->fs_bsize || 734 asb->fs_fsize != sb->fs_fsize || 735 asb->fs_frag != sb->fs_frag || 736 asb->fs_bmask != sb->fs_bmask || 737 asb->fs_fmask != sb->fs_fmask || 738 asb->fs_bshift != sb->fs_bshift || 739 asb->fs_fshift != sb->fs_fshift || 740 asb->fs_fragshift != sb->fs_fragshift || 741 asb->fs_fsbtodb != sb->fs_fsbtodb || 742 asb->fs_sbsize != sb->fs_sbsize || 743 asb->fs_nindir != sb->fs_nindir || 744 asb->fs_inopb != sb->fs_inopb || 745 asb->fs_cssize != sb->fs_cssize || 746 asb->fs_ipg != sb->fs_ipg || 747 asb->fs_fpg != sb->fs_fpg || 748 asb->fs_magic != sb->fs_magic) 749 return 1; 750 return 0; 751 } 752 753 static void 754 badsb(listerr, s) 755 int listerr; 756 char *s; 757 { 758 759 if (!listerr) 760 return; 761 if (preen) 762 printf("%s: ", cdevname()); 763 pfatal("BAD SUPER BLOCK: %s\n", s); 764 } 765 766 /* 767 * Calculate a prototype superblock based on information in the disk label. 768 * When done the cgsblock macro can be calculated and the fs_ncg field 769 * can be used. Do NOT attempt to use other macros without verifying that 770 * their needed information is available! 771 */ 772 static int 773 calcsb(dev, devfd, fs) 774 const char *dev; 775 int devfd; 776 struct fs *fs; 777 { 778 struct disklabel *lp; 779 struct partition *pp; 780 int i, nspf; 781 782 lp = getdisklabel(dev, devfd); 783 pp = getdisklabelpart(dev,lp); 784 if (pp == 0) { 785 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 786 return (0); 787 } 788 if ((pp->p_fstype != FS_BSDFFS) && (pp->p_fstype != FS_APPLEUFS)) { 789 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 790 dev, pp->p_fstype < FSMAXTYPES ? 791 fstypenames[pp->p_fstype] : "unknown"); 792 return (0); 793 } 794 /* avoid divide by 0 */ 795 if (pp->p_fsize == 0 || pp->p_frag == 0) 796 return (0); 797 memset(fs, 0, sizeof(struct fs)); 798 fs->fs_fsize = pp->p_fsize; 799 fs->fs_frag = pp->p_frag; 800 fs->fs_size = pp->p_size; 801 fs->fs_sblkno = roundup( 802 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 803 fs->fs_frag); 804 nspf = fs->fs_fsize / lp->d_secsize; 805 fs->fs_old_nspf = nspf; 806 for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1) 807 fs->fs_fsbtodb++; 808 dev_bsize = lp->d_secsize; 809 if (fs->fs_magic == FS_UFS2_MAGIC) { 810 fs->fs_fpg = pp->p_cpg; 811 fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg); 812 } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ { 813 fs->fs_old_cpg = pp->p_cpg; 814 fs->fs_old_cgmask = 0xffffffff; 815 for (i = lp->d_ntracks; i > 1; i >>= 1) 816 fs->fs_old_cgmask <<= 1; 817 if (!POWEROF2(lp->d_ntracks)) 818 fs->fs_old_cgmask <<= 1; 819 fs->fs_old_cgoffset = roundup( 820 howmany(lp->d_nsectors, nspf), fs->fs_frag); 821 fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf; 822 fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl, 823 fs->fs_old_cpg); 824 } 825 return (1); 826 } 827 828 static struct disklabel * 829 getdisklabel(s, fd) 830 const char *s; 831 int fd; 832 { 833 static struct disklabel lab; 834 835 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 836 if (s == NULL) 837 return ((struct disklabel *)NULL); 838 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 839 errx(EEXIT, "%s: can't read disk label", s); 840 } 841 return (&lab); 842 } 843 844 static struct partition * 845 getdisklabelpart(dev, lp) 846 const char *dev; 847 struct disklabel *lp; 848 { 849 char *cp; 850 851 cp = strchr(dev, '\0') - 1; 852 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'p')) && !isdigit(*cp)) { 853 return 0; 854 } 855 if (isdigit(*cp)) 856 return &lp->d_partitions[0]; 857 else 858 return &lp->d_partitions[*cp - 'a']; 859 } 860 861
Indexes created Tue Sep 23 07:09:52 GMT 2025