setup.c revision 1.65
1 /* $NetBSD: setup.c,v 1.65 2004/01/09 19:12:31 dbj 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 1.65 2004/01/09 19:12:31 dbj 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 int16_t sblkpostbl[256]; 76 77 /* 78 * Read in a superblock finding an alternate if necessary. 79 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 80 * is already clean (preen mode only). 81 */ 82 int 83 setup(dev) 84 const char *dev; 85 { 86 long cg, size, asked, i, j; 87 long bmapsize; 88 struct disklabel *lp; 89 off_t sizepb; 90 struct stat statb; 91 struct fs proto; 92 int doskipclean; 93 u_int64_t maxfilesize; 94 struct csum *ccsp; 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 (!forceimage && !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 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 113 fswritefd = -1; 114 if (preen) 115 pfatal("NO WRITE ACCESS"); 116 printf("** %s (NO WRITE)\n", dev); 117 quiet = 0; 118 } else 119 if (!preen && !quiet) 120 printf("** %s\n", dev); 121 fsmodified = 0; 122 lfdir = 0; 123 initbarea(&sblk); 124 initbarea(&asblk); 125 sblk.b_un.b_buf = malloc(SBLOCKSIZE); 126 sblock = malloc(SBLOCKSIZE); 127 asblk.b_un.b_buf = malloc(SBLOCKSIZE); 128 altsblock = malloc(SBLOCKSIZE); 129 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL || 130 sblock == NULL || altsblock == NULL) 131 errx(EEXIT, "cannot allocate space for superblock"); 132 if (!forceimage && (lp = getdisklabel(NULL, fsreadfd)) != NULL) 133 dev_bsize = secsize = lp->d_secsize; 134 else 135 dev_bsize = secsize = DEV_BSIZE; 136 /* 137 * Read in the superblock, looking for alternates if necessary 138 */ 139 if (readsb(1) == 0) { 140 if (bflag || preen || forceimage || 141 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 if (!quiet) 170 pwarn("%sile system is clean; not checking\n", 171 preen ? "f" : "** F"); 172 return (-1); 173 } 174 if (!preen && !doswap) 175 pwarn("** File system is already clean\n"); 176 } 177 maxfsblock = sblock->fs_size; 178 maxino = sblock->fs_ncg * sblock->fs_ipg; 179 sizepb = sblock->fs_bsize; 180 maxfilesize = sblock->fs_bsize * NDADDR - 1; 181 for (i = 0; i < NIADDR; i++) { 182 sizepb *= NINDIR(sblock); 183 maxfilesize += sizepb; 184 } 185 if ((!is_ufs2 && cvtlevel >= 4) && 186 (sblock->fs_old_flags & FS_FLAGS_UPDATED) == 0) { 187 if (preen) 188 pwarn("CONVERTING TO FFSv2 SUPERBLOCK\n"); 189 else if (!reply("CONVERT TO FFSv2 SUPERBLOCK")) 190 return(0); 191 sblock->fs_old_flags |= FS_FLAGS_UPDATED; 192 /* Disable the postbl tables */ 193 sblock->fs_old_cpc = 0; 194 sblock->fs_old_nrpos = 0; 195 sblock->fs_old_trackskew = 0; 196 /* The other fields have already been updated by 197 * sb_oldfscompat_read 198 */ 199 sbdirty(); 200 } 201 /* 202 * Check and potentially fix certain fields in the super block. 203 */ 204 if (sblock->fs_optim != FS_OPTTIME && sblock->fs_optim != FS_OPTSPACE) { 205 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 206 if (reply("SET TO DEFAULT") == 1) { 207 sblock->fs_optim = FS_OPTTIME; 208 sbdirty(); 209 } 210 } 211 if ((sblock->fs_minfree < 0 || sblock->fs_minfree > 99)) { 212 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 213 sblock->fs_minfree); 214 if (reply("SET TO DEFAULT") == 1) { 215 sblock->fs_minfree = 10; 216 sbdirty(); 217 } 218 } 219 if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && 220 (sblock->fs_old_interleave < 1 || 221 sblock->fs_old_interleave > sblock->fs_old_nsect)) { 222 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 223 sblock->fs_old_interleave); 224 sblock->fs_old_interleave = 1; 225 if (preen) 226 printf(" (FIXED)\n"); 227 if (preen || reply("SET TO DEFAULT") == 1) { 228 sbdirty(); 229 dirty(&asblk); 230 } 231 } 232 if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && 233 (sblock->fs_old_npsect < sblock->fs_old_nsect || 234 sblock->fs_old_npsect > sblock->fs_old_nsect*2)) { 235 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 236 sblock->fs_old_npsect); 237 sblock->fs_old_npsect = sblock->fs_old_nsect; 238 if (preen) 239 printf(" (FIXED)\n"); 240 if (preen || reply("SET TO DEFAULT") == 1) { 241 sbdirty(); 242 dirty(&asblk); 243 } 244 } 245 if (sblock->fs_bmask != ~(sblock->fs_bsize - 1)) { 246 pwarn("INCORRECT BMASK=0x%x IN SUPERBLOCK", 247 sblock->fs_bmask); 248 sblock->fs_bmask = ~(sblock->fs_bsize - 1); 249 if (preen) 250 printf(" (FIXED)\n"); 251 if (preen || reply("FIX") == 1) { 252 sbdirty(); 253 dirty(&asblk); 254 } 255 } 256 if (sblock->fs_fmask != ~(sblock->fs_fsize - 1)) { 257 pwarn("INCORRECT FMASK=0x%x IN SUPERBLOCK", 258 sblock->fs_fmask); 259 sblock->fs_fmask = ~(sblock->fs_fsize - 1); 260 if (preen) 261 printf(" (FIXED)\n"); 262 if (preen || reply("FIX") == 1) { 263 sbdirty(); 264 dirty(&asblk); 265 } 266 } 267 if (sblock->fs_old_inodefmt >= FS_44INODEFMT) { 268 if (sblock->fs_maxfilesize != maxfilesize) { 269 pwarn("INCORRECT MAXFILESIZE=%lld IN SUPERBLOCK", 270 (unsigned long long)sblock->fs_maxfilesize); 271 sblock->fs_maxfilesize = maxfilesize; 272 if (preen) 273 printf(" (FIXED)\n"); 274 if (preen || reply("FIX") == 1) { 275 sbdirty(); 276 dirty(&asblk); 277 } 278 } 279 if ((is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS2) 280 || 281 (!is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS1)) 282 { 283 pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", 284 sblock->fs_maxsymlinklen); 285 sblock->fs_maxsymlinklen = is_ufs2 ? 286 MAXSYMLINKLEN_UFS2 : MAXSYMLINKLEN_UFS1; 287 if (preen) 288 printf(" (FIXED)\n"); 289 if (preen || reply("FIX") == 1) { 290 sbdirty(); 291 dirty(&asblk); 292 } 293 } 294 if (sblock->fs_qbmask != ~sblock->fs_bmask) { 295 pwarn("INCORRECT QBMASK=%llx IN SUPERBLOCK", 296 (unsigned long long)sblock->fs_qbmask); 297 sblock->fs_qbmask = ~sblock->fs_bmask; 298 if (preen) 299 printf(" (FIXED)\n"); 300 if (preen || reply("FIX") == 1) { 301 sbdirty(); 302 dirty(&asblk); 303 } 304 } 305 if (sblock->fs_qfmask != ~sblock->fs_fmask) { 306 pwarn("INCORRECT QFMASK=%llx IN SUPERBLOCK", 307 (unsigned long long)sblock->fs_qfmask); 308 sblock->fs_qfmask = ~sblock->fs_fmask; 309 if (preen) 310 printf(" (FIXED)\n"); 311 if (preen || reply("FIX") == 1) { 312 sbdirty(); 313 dirty(&asblk); 314 } 315 } 316 newinofmt = 1; 317 } else { 318 sblock->fs_qbmask = ~sblock->fs_bmask; 319 sblock->fs_qfmask = ~sblock->fs_fmask; 320 newinofmt = 0; 321 } 322 /* 323 * Convert to new inode format. 324 */ 325 if (!is_ufs2 && cvtlevel >= 2 && 326 sblock->fs_old_inodefmt < FS_44INODEFMT) { 327 if (preen) 328 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 329 else if (!reply("CONVERT TO NEW INODE FORMAT")) 330 return(0); 331 doinglevel2++; 332 sblock->fs_old_inodefmt = FS_44INODEFMT; 333 sblock->fs_maxfilesize = maxfilesize; 334 sblock->fs_maxsymlinklen = MAXSYMLINKLEN_UFS1; 335 sblock->fs_qbmask = ~sblock->fs_bmask; 336 sblock->fs_qfmask = ~sblock->fs_fmask; 337 sbdirty(); 338 dirty(&asblk); 339 } 340 /* 341 * Convert to new cylinder group format. 342 */ 343 if (!is_ufs2 && cvtlevel >= 1 && 344 sblock->fs_old_postblformat == FS_42POSTBLFMT) { 345 if (preen) 346 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 347 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 348 return(0); 349 doinglevel1++; 350 sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT; 351 sblock->fs_old_nrpos = 8; 352 sblock->fs_old_postbloff = 353 (char *)(&sblock->fs_old_postbl_start) - 354 (char *)(&sblock->fs_firstfield); 355 sblock->fs_old_rotbloff = 356 (char *)(&sblock->fs_magic+1) - 357 (char *)(&sblock->fs_firstfield); 358 sblock->fs_cgsize = 359 fragroundup(sblock, CGSIZE(sblock)); 360 sbdirty(); 361 dirty(&asblk); 362 } 363 if (asblk.b_dirty && !bflag) { 364 memmove(sblk.b_un.b_fs, sblock, SBLOCKSIZE); 365 sb_oldfscompat_write(sblk.b_un.b_fs, sblocksave); 366 if (needswap) 367 ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs); 368 memmove(asblk.b_un.b_fs, sblk.b_un.b_fs, (size_t)sblock->fs_sbsize); 369 flush(fswritefd, &asblk); 370 } 371 /* 372 * read in the summary info. 373 */ 374 asked = 0; 375 sblock->fs_csp = (struct csum *)calloc(1, sblock->fs_cssize); 376 for (i = 0, j = 0; i < sblock->fs_cssize; i += sblock->fs_bsize, j++) { 377 size = sblock->fs_cssize - i < sblock->fs_bsize ? 378 sblock->fs_cssize - i : sblock->fs_bsize; 379 ccsp = (struct csum *)((char *)sblock->fs_csp + i); 380 if (bread(fsreadfd, (char *)ccsp, 381 fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag), 382 size) != 0 && !asked) { 383 pfatal("BAD SUMMARY INFORMATION"); 384 if (reply("CONTINUE") == 0) { 385 markclean = 0; 386 exit(EEXIT); 387 } 388 asked++; 389 } 390 if (doswap) { 391 ffs_csum_swap(ccsp, ccsp, size); 392 bwrite(fswritefd, (char *)ccsp, 393 fsbtodb(sblock, 394 sblock->fs_csaddr + j * sblock->fs_frag), 395 size); 396 } 397 if (needswap) 398 ffs_csum_swap(ccsp, ccsp, size); 399 } 400 /* 401 * allocate and initialize the necessary maps 402 */ 403 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 404 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 405 if (blockmap == NULL) { 406 pwarn("cannot alloc %u bytes for blockmap\n", 407 (unsigned)bmapsize); 408 goto badsblabel; 409 } 410 inostathead = calloc((unsigned)(sblock->fs_ncg), 411 sizeof(struct inostatlist)); 412 if (inostathead == NULL) { 413 pwarn("cannot alloc %u bytes for inostathead\n", 414 (unsigned)(sizeof(struct inostatlist) * (sblock->fs_ncg))); 415 goto badsblabel; 416 } 417 /* 418 * cs_ndir may be inaccurate, particularly if we're using the -b 419 * option, so set a minimum to prevent bogus subdirectory reconnects 420 * and really inefficient directory scans. 421 * Also set a maximum in case the value is too large. 422 */ 423 numdirs = sblock->fs_cstotal.cs_ndir; 424 if (numdirs < 1024) 425 numdirs = 1024; 426 if (numdirs > maxino + 1) 427 numdirs = maxino + 1; 428 dirhash = numdirs; 429 inplast = 0; 430 listmax = numdirs + 10; 431 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 432 sizeof(struct inoinfo *)); 433 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 434 sizeof(struct inoinfo *)); 435 if (inpsort == NULL || inphead == NULL) { 436 pwarn("cannot alloc %u bytes for inphead\n", 437 (unsigned)(numdirs * sizeof(struct inoinfo *))); 438 goto badsblabel; 439 } 440 cgrp = malloc(sblock->fs_cgsize); 441 if (cgrp == NULL) { 442 pwarn("cannot alloc %u bytes for cylinder group\n", 443 sblock->fs_cgsize); 444 goto badsblabel; 445 } 446 bufinit(); 447 if (sblock->fs_flags & FS_DOSOFTDEP) 448 usedsoftdep = 1; 449 else 450 usedsoftdep = 0; 451 452 { 453 struct partition *pp = 0; 454 if (!forceimage && lp) 455 pp = getdisklabelpart(dev,lp); 456 if (pp && (pp->p_fstype == FS_APPLEUFS)) { 457 isappleufs = 1; 458 } 459 } 460 if (readappleufs()) { 461 isappleufs = 1; 462 } 463 464 dirblksiz = DIRBLKSIZ; 465 if (isappleufs) 466 dirblksiz = APPLEUFS_DIRBLKSIZ; 467 468 if (debug) 469 printf("isappleufs = %d, dirblksiz = %d\n", isappleufs, dirblksiz); 470 471 return (1); 472 473 badsblabel: 474 markclean=0; 475 ckfini(); 476 return (0); 477 } 478 479 static int 480 readappleufs() 481 { 482 daddr_t label = APPLEUFS_LABEL_OFFSET / dev_bsize; 483 struct appleufslabel *appleufs; 484 int i; 485 486 /* XXX do we have to deal with APPLEUFS_LABEL_OFFSET not 487 * being block aligned (CD's?) 488 */ 489 if (bread(fsreadfd, (char *)appleufsblk.b_un.b_fs, label, (long)APPLEUFS_LABEL_SIZE) != 0) 490 return 0; 491 appleufsblk.b_bno = label; 492 appleufsblk.b_size = APPLEUFS_LABEL_SIZE; 493 494 appleufs = appleufsblk.b_un.b_appleufs; 495 496 if (ntohl(appleufs->ul_magic) != APPLEUFS_LABEL_MAGIC) { 497 if (!isappleufs) { 498 return 0; 499 } else { 500 pfatal("MISSING APPLEUFS VOLUME LABEL\n"); 501 if (reply("FIX") == 0) { 502 return 1; 503 } 504 ffs_appleufs_set(appleufs, NULL, -1, 0); 505 appleufsdirty(); 506 } 507 } 508 509 if (ntohl(appleufs->ul_version) != APPLEUFS_LABEL_VERSION) { 510 pwarn("INCORRECT APPLE UFS VERSION NUMBER (%d should be %d)", 511 ntohl(appleufs->ul_version),APPLEUFS_LABEL_VERSION); 512 if (preen) { 513 printf(" (CORRECTED)\n"); 514 } 515 if (preen || reply("CORRECT")) { 516 appleufs->ul_version = htonl(APPLEUFS_LABEL_VERSION); 517 appleufsdirty(); 518 } 519 } 520 521 if (ntohs(appleufs->ul_namelen) > APPLEUFS_MAX_LABEL_NAME) { 522 pwarn("APPLE UFS LABEL NAME TOO LONG"); 523 if (preen) { 524 printf(" (TRUNCATED)\n"); 525 } 526 if (preen || reply("TRUNCATE")) { 527 appleufs->ul_namelen = htons(APPLEUFS_MAX_LABEL_NAME); 528 appleufsdirty(); 529 } 530 } 531 532 if (ntohs(appleufs->ul_namelen) == 0) { 533 pwarn("MISSING APPLE UFS LABEL NAME"); 534 if (preen) { 535 printf(" (FIXED)\n"); 536 } 537 if (preen || reply("FIX")) { 538 ffs_appleufs_set(appleufs, NULL, -1, 0); 539 appleufsdirty(); 540 } 541 } 542 543 /* Scan name for first illegal character */ 544 for (i=0;i<ntohs(appleufs->ul_namelen);i++) { 545 if ((appleufs->ul_name[i] == '\0') || 546 (appleufs->ul_name[i] == ':') || 547 (appleufs->ul_name[i] == '/')) { 548 pwarn("APPLE UFS LABEL NAME CONTAINS ILLEGAL CHARACTER"); 549 if (preen) { 550 printf(" (TRUNCATED)\n"); 551 } 552 if (preen || reply("TRUNCATE")) { 553 appleufs->ul_namelen = i+1; 554 appleufsdirty(); 555 } 556 break; 557 } 558 } 559 560 /* Check the checksum last, because if anything else was wrong, 561 * then the checksum gets reset anyway. 562 */ 563 appleufs->ul_checksum = 0; 564 appleufs->ul_checksum = ffs_appleufs_cksum(appleufs); 565 if (appleufsblk.b_un.b_appleufs->ul_checksum != appleufs->ul_checksum) { 566 pwarn("INVALID APPLE UFS CHECKSUM (%#04x should be %#04x)", 567 appleufsblk.b_un.b_appleufs->ul_checksum, appleufs->ul_checksum); 568 if (preen) { 569 printf(" (CORRECTED)\n"); 570 } 571 if (preen || reply("CORRECT")) { 572 appleufsdirty(); 573 } else { 574 /* put the incorrect checksum back in place */ 575 appleufs->ul_checksum = appleufsblk.b_un.b_appleufs->ul_checksum; 576 } 577 } 578 return 1; 579 } 580 581 /* 582 * Detect byte order. Return 0 if valid magic found, -1 otherwise. 583 */ 584 static int 585 detect_byteorder(struct fs *fs) 586 { 587 if (fs->fs_magic == FS_UFS1_MAGIC || fs->fs_magic == FS_UFS2_MAGIC) { 588 if (endian == 0 || BYTE_ORDER == endian) { 589 needswap = 0; 590 doswap = do_blkswap = do_dirswap = 0; 591 } else { 592 needswap = 1; 593 doswap = do_blkswap = do_dirswap = 1; 594 } 595 return 0; 596 } else if (fs->fs_magic == bswap32(FS_UFS1_MAGIC) || 597 fs->fs_magic == bswap32(FS_UFS2_MAGIC)) { 598 if (endian == 0 || BYTE_ORDER != endian) { 599 needswap = 1; 600 doswap = do_blkswap = do_dirswap = 0; 601 } else { 602 needswap = 0; 603 doswap = do_blkswap = do_dirswap = 1; 604 } 605 return 0; 606 } 607 return -1; 608 } 609 610 /* 611 * Possible superblock locations ordered from most to least likely. 612 */ 613 static off_t sblock_try[] = SBLOCKSEARCH; 614 615 /* 616 * Read in the super block and its summary info. 617 */ 618 static int 619 readsb(listerr) 620 int listerr; 621 { 622 daddr_t super; 623 struct fs *fs; 624 int i; 625 626 if (bflag) { 627 super = bflag; 628 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, 629 (long)SBLOCKSIZE) != 0) 630 return (0); 631 fs = sblk.b_un.b_fs; 632 if (detect_byteorder(fs) < 0) { 633 badsb(listerr, "MAGIC NUMBER WRONG"); 634 return (0); 635 } 636 } else { 637 for (i = 0; sblock_try[i] != -1; i++) { 638 super = sblock_try[i] / dev_bsize; 639 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, 640 super, (long)SBLOCKSIZE) != 0) 641 continue; 642 fs = sblk.b_un.b_fs; 643 if (detect_byteorder(fs) == 0) 644 break; 645 } 646 if (sblock_try[i] == -1) { 647 badsb(listerr, "CAN'T FIND SUPERBLOCK"); 648 return (0); 649 } 650 } 651 if (doswap) { 652 if (preen) 653 errx(EEXIT, "incompatible options -B and -p"); 654 if (nflag) 655 errx(EEXIT, "incompatible options -B and -n"); 656 if (endian == LITTLE_ENDIAN) { 657 if (!reply("CONVERT TO LITTLE ENDIAN")) 658 return 0; 659 } else if (endian == BIG_ENDIAN) { 660 if (!reply("CONVERT TO BIG ENDIAN")) 661 return 0; 662 } else 663 pfatal("INTERNAL ERROR: unknown endian"); 664 } 665 if (needswap) 666 pwarn("** Swapped byte order\n"); 667 /* swap SB byte order if asked */ 668 if (doswap) 669 ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs); 670 671 memmove(sblock, sblk.b_un.b_fs, SBLOCKSIZE); 672 if (needswap) 673 ffs_sb_swap(sblk.b_un.b_fs, sblock); 674 675 is_ufs2 = sblock->fs_magic == FS_UFS2_MAGIC; 676 677 /* 678 * run a few consistency checks of the super block 679 */ 680 if (sblock->fs_sbsize > SBLOCKSIZE) 681 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 682 /* 683 * Compute block size that the filesystem is based on, 684 * according to fsbtodb, and adjust superblock block number 685 * so we can tell if this is an alternate later. 686 */ 687 super *= dev_bsize; 688 dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1); 689 sblk.b_bno = super / dev_bsize; 690 sblk.b_size = SBLOCKSIZE; 691 if (bflag) 692 goto out; 693 /* 694 * Set all possible fields that could differ, then do check 695 * of whole super block against an alternate super block-> 696 * When an alternate super-block is specified this check is skipped. 697 */ 698 getblk(&asblk, cgsblock(sblock, sblock->fs_ncg - 1), sblock->fs_sbsize); 699 if (asblk.b_errs) 700 return (0); 701 /* swap SB byte order if asked */ 702 if (doswap) 703 ffs_sb_swap(asblk.b_un.b_fs, asblk.b_un.b_fs); 704 705 memmove(altsblock, asblk.b_un.b_fs, sblock->fs_sbsize); 706 if (needswap) 707 ffs_sb_swap(asblk.b_un.b_fs, altsblock); 708 if (cmpsblks(sblock, altsblock)) { 709 if (debug) { 710 uint32_t *nlp, *olp, *endlp; 711 712 printf("superblock mismatches\n"); 713 nlp = (uint32_t *)altsblock; 714 olp = (uint32_t *)sblock; 715 endlp = olp + (sblock->fs_sbsize / sizeof *olp); 716 for ( ; olp < endlp; olp++, nlp++) { 717 if (*olp == *nlp) 718 continue; 719 printf("offset %#x, original 0x%08x, alternate 0x%08x\n", 720 (uint8_t *)olp-(uint8_t *)sblock, *olp, *nlp); 721 } 722 } 723 badsb(listerr, 724 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 725 return (0); 726 } 727 out: 728 729 sb_oldfscompat_read(sblock, &sblocksave); 730 731 /* Now we know the SB is valid, we can write it back if needed */ 732 if (doswap) { 733 sbdirty(); 734 dirty(&asblk); 735 } 736 havesb = 1; 737 return (1); 738 } 739 740 int 741 cmpsblks(const struct fs *sb, struct fs *asb) 742 { 743 if (!is_ufs2 && ((sb->fs_old_flags & FS_FLAGS_UPDATED) == 0)) { 744 if (sb->fs_old_postblformat < FS_DYNAMICPOSTBLFMT) 745 return cmpsblks42(sb, asb); 746 else 747 return cmpsblks44(sb, asb); 748 } 749 if (asb->fs_sblkno != sb->fs_sblkno || 750 asb->fs_cblkno != sb->fs_cblkno || 751 asb->fs_iblkno != sb->fs_iblkno || 752 asb->fs_dblkno != sb->fs_dblkno || 753 asb->fs_ncg != sb->fs_ncg || 754 asb->fs_bsize != sb->fs_bsize || 755 asb->fs_fsize != sb->fs_fsize || 756 asb->fs_frag != sb->fs_frag || 757 asb->fs_bmask != sb->fs_bmask || 758 asb->fs_fmask != sb->fs_fmask || 759 asb->fs_bshift != sb->fs_bshift || 760 asb->fs_fshift != sb->fs_fshift || 761 asb->fs_fragshift != sb->fs_fragshift || 762 asb->fs_fsbtodb != sb->fs_fsbtodb || 763 asb->fs_sbsize != sb->fs_sbsize || 764 asb->fs_nindir != sb->fs_nindir || 765 asb->fs_inopb != sb->fs_inopb || 766 asb->fs_cssize != sb->fs_cssize || 767 asb->fs_ipg != sb->fs_ipg || 768 asb->fs_fpg != sb->fs_fpg || 769 asb->fs_magic != sb->fs_magic) 770 return 1; 771 return 0; 772 } 773 774 /* BSD 4.2 performed the following superblock comparison 775 * It should correspond to FS_42POSTBLFMT 776 * (although note that in 4.2, the fs_old_postblformat 777 * field didn't exist and the corresponding bits are 778 * located near the end of the postbl itself, where they 779 * are not likely to be used.) 780 */ 781 int 782 cmpsblks42(const struct fs *sb, struct fs *asb) 783 { 784 asb->fs_firstfield = sb->fs_firstfield; /* fs_link */ 785 asb->fs_unused_1 = sb->fs_unused_1; /* fs_rlink */ 786 asb->fs_old_time = sb->fs_old_time; /* fs_time */ 787 asb->fs_old_cstotal = sb->fs_old_cstotal; /* fs_cstotal */ 788 asb->fs_cgrotor = sb->fs_cgrotor; 789 asb->fs_fmod = sb->fs_fmod; 790 asb->fs_clean = sb->fs_clean; 791 asb->fs_ronly = sb->fs_ronly; 792 asb->fs_old_flags = sb->fs_old_flags; 793 asb->fs_maxcontig = sb->fs_maxcontig; 794 asb->fs_minfree = sb->fs_minfree; 795 asb->fs_old_rotdelay = sb->fs_old_rotdelay; 796 asb->fs_maxbpg = sb->fs_maxbpg; 797 798 /* The former fs_csp, totaling 128 bytes */ 799 memmove(asb->fs_ocsp, sb->fs_ocsp, sizeof sb->fs_ocsp); 800 asb->fs_contigdirs = sb->fs_contigdirs; 801 asb->fs_csp = sb->fs_csp; 802 asb->fs_maxcluster = sb->fs_maxcluster; 803 asb->fs_active = sb->fs_active; 804 805 /* The former fs_fsmnt, totaling 512 bytes */ 806 memmove(asb->fs_fsmnt, sb->fs_fsmnt, sizeof sb->fs_fsmnt); 807 memmove(asb->fs_volname, sb->fs_volname, sizeof sb->fs_volname); 808 809 return memcmp(sb, asb, sb->fs_sbsize); 810 } 811 812 /* BSD 4.4 performed the following superblock comparison 813 * This was used in NetBSD through 1.6.1 814 * 815 * Note that this implementation is destructive to asb. 816 */ 817 int 818 cmpsblks44(const struct fs *sb, struct fs *asb) 819 { 820 /* 821 * "Copy fields which we don't care if they're different in the 822 * alternate superblocks, as they're either likely to be 823 * different because they're per-cylinder-group specific, or 824 * because they're transient details which are only maintained 825 * in the primary superblock." 826 */ 827 asb->fs_firstfield = sb->fs_firstfield; 828 asb->fs_unused_1 = sb->fs_unused_1; 829 asb->fs_old_time = sb->fs_old_time; 830 asb->fs_old_cstotal = sb->fs_old_cstotal; 831 asb->fs_cgrotor = sb->fs_cgrotor; 832 asb->fs_fmod = sb->fs_fmod; 833 asb->fs_clean = sb->fs_clean; 834 asb->fs_ronly = sb->fs_ronly; 835 asb->fs_old_flags = sb->fs_old_flags; 836 asb->fs_maxcontig = sb->fs_maxcontig; 837 asb->fs_minfree = sb->fs_minfree; 838 asb->fs_optim = sb->fs_optim; 839 asb->fs_old_rotdelay = sb->fs_old_rotdelay; 840 asb->fs_maxbpg = sb->fs_maxbpg; 841 842 /* The former fs_csp and fs_maxcluster, totaling 128 bytes */ 843 memmove(asb->fs_ocsp, sb->fs_ocsp, sizeof sb->fs_ocsp); 844 asb->fs_contigdirs = sb->fs_contigdirs; 845 asb->fs_csp = sb->fs_csp; 846 asb->fs_maxcluster = sb->fs_maxcluster; 847 asb->fs_active = sb->fs_active; 848 849 /* The former fs_fsmnt, totaling 512 bytes */ 850 memmove(asb->fs_fsmnt, sb->fs_fsmnt, sizeof sb->fs_fsmnt); 851 memmove(asb->fs_volname, sb->fs_volname, sizeof sb->fs_volname); 852 853 /* The former fs_sparecon, totaling 200 bytes */ 854 memmove(asb->fs_snapinum, 855 sb->fs_snapinum, sizeof sb->fs_snapinum); 856 asb->fs_avgfilesize = sb->fs_avgfilesize; 857 asb->fs_avgfpdir = sb->fs_avgfpdir; 858 asb->fs_save_cgsize = sb->fs_save_cgsize; 859 memmove(asb->fs_sparecon32, 860 sb->fs_sparecon32, sizeof sb->fs_sparecon32); 861 asb->fs_flags = sb->fs_flags; 862 863 /* Original comment: 864 * "The following should not have to be copied, but need to be." 865 */ 866 asb->fs_fsbtodb = sb->fs_fsbtodb; 867 asb->fs_old_interleave = sb->fs_old_interleave; 868 asb->fs_old_npsect = sb->fs_old_npsect; 869 asb->fs_old_nrpos = sb->fs_old_nrpos; 870 asb->fs_state = sb->fs_state; 871 asb->fs_qbmask = sb->fs_qbmask; 872 asb->fs_qfmask = sb->fs_qfmask; 873 asb->fs_state = sb->fs_state; 874 asb->fs_maxfilesize = sb->fs_maxfilesize; 875 876 /* 877 * "Compare the superblocks, effectively checking every other 878 * field to see if they differ." 879 */ 880 return memcmp(sb, asb, sb->fs_sbsize); 881 } 882 883 884 static void 885 badsb(listerr, s) 886 int listerr; 887 char *s; 888 { 889 890 if (!listerr) 891 return; 892 if (preen) 893 printf("%s: ", cdevname()); 894 pfatal("BAD SUPER BLOCK: %s\n", s); 895 } 896 897 /* 898 * Calculate a prototype superblock based on information in the disk label. 899 * When done the cgsblock macro can be calculated and the fs_ncg field 900 * can be used. Do NOT attempt to use other macros without verifying that 901 * their needed information is available! 902 */ 903 static int 904 calcsb(dev, devfd, fs) 905 const char *dev; 906 int devfd; 907 struct fs *fs; 908 { 909 struct disklabel *lp; 910 struct partition *pp; 911 int i, nspf; 912 913 lp = getdisklabel(dev, devfd); 914 pp = getdisklabelpart(dev,lp); 915 if (pp == 0) { 916 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 917 return (0); 918 } 919 if ((pp->p_fstype != FS_BSDFFS) && (pp->p_fstype != FS_APPLEUFS)) { 920 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 921 dev, pp->p_fstype < FSMAXTYPES ? 922 fstypenames[pp->p_fstype] : "unknown"); 923 return (0); 924 } 925 /* avoid divide by 0 */ 926 if (pp->p_fsize == 0 || pp->p_frag == 0) 927 return (0); 928 memset(fs, 0, sizeof(struct fs)); 929 fs->fs_fsize = pp->p_fsize; 930 fs->fs_frag = pp->p_frag; 931 fs->fs_size = pp->p_size; 932 fs->fs_sblkno = roundup( 933 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 934 fs->fs_frag); 935 nspf = fs->fs_fsize / lp->d_secsize; 936 fs->fs_old_nspf = nspf; 937 for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1) 938 fs->fs_fsbtodb++; 939 dev_bsize = lp->d_secsize; 940 if (fs->fs_magic == FS_UFS2_MAGIC) { 941 fs->fs_fpg = pp->p_cpg; 942 fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg); 943 } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ { 944 fs->fs_old_cpg = pp->p_cpg; 945 fs->fs_old_cgmask = 0xffffffff; 946 for (i = lp->d_ntracks; i > 1; i >>= 1) 947 fs->fs_old_cgmask <<= 1; 948 if (!POWEROF2(lp->d_ntracks)) 949 fs->fs_old_cgmask <<= 1; 950 fs->fs_old_cgoffset = roundup( 951 howmany(lp->d_nsectors, nspf), fs->fs_frag); 952 fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf; 953 fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl, 954 fs->fs_old_cpg); 955 } 956 return (1); 957 } 958 959 static struct disklabel * 960 getdisklabel(s, fd) 961 const char *s; 962 int fd; 963 { 964 static struct disklabel lab; 965 966 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 967 if (s == NULL) 968 return ((struct disklabel *)NULL); 969 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 970 errx(EEXIT, "%s: can't read disk label", s); 971 } 972 return (&lab); 973 } 974 975 static struct partition * 976 getdisklabelpart(dev, lp) 977 const char *dev; 978 struct disklabel *lp; 979 { 980 char *cp; 981 982 cp = strchr(dev, '\0') - 1; 983 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'p')) && !isdigit(*cp)) { 984 return 0; 985 } 986 if (isdigit(*cp)) 987 return &lp->d_partitions[0]; 988 else 989 return &lp->d_partitions[*cp - 'a']; 990 } 991 992
Indexes created Thu Sep 25 16:09:42 GMT 2025