setup.c revision 1.60
1 /* $NetBSD: setup.c,v 1.60 2003/04/06 17:23:26 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 1.60 2003/04/06 17:23:26 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/dir.h> 55 #include <ufs/ufs/ufs_bswap.h> 56 #include <ufs/ffs/fs.h> 57 #include <ufs/ffs/ffs_extern.h> 58 59 #include <ctype.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 66 #include "fsck.h" 67 #include "extern.h" 68 #include "fsutil.h" 69 70 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 71 72 static void badsb __P((int, char *)); 73 static int calcsb __P((const char *, int, struct fs *)); 74 static struct disklabel *getdisklabel __P((const char *, int)); 75 static struct partition *getdisklabelpart __P((const char *, struct disklabel *)); 76 static int readsb __P((int)); 77 static int readappleufs __P((void)); 78 79 /* 80 * Read in a superblock finding an alternate if necessary. 81 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 82 * is already clean (preen mode only). 83 */ 84 int 85 setup(dev) 86 const char *dev; 87 { 88 long cg, size, asked, i, j; 89 long bmapsize; 90 struct disklabel *lp; 91 off_t sizepb; 92 struct stat statb; 93 struct fs proto; 94 int doskipclean; 95 u_int64_t maxfilesize; 96 struct csum *ccsp; 97 98 havesb = 0; 99 fswritefd = -1; 100 doskipclean = skipclean; 101 if (stat(dev, &statb) < 0) { 102 printf("Can't stat %s: %s\n", dev, strerror(errno)); 103 return (0); 104 } 105 if (!forceimage && !S_ISCHR(statb.st_mode)) { 106 pfatal("%s is not a character device", dev); 107 if (reply("CONTINUE") == 0) 108 return (0); 109 } 110 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 111 printf("Can't open %s: %s\n", dev, strerror(errno)); 112 return (0); 113 } 114 if (preen == 0) 115 printf("** %s", dev); 116 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 117 fswritefd = -1; 118 if (preen) 119 pfatal("NO WRITE ACCESS"); 120 printf(" (NO WRITE)"); 121 } 122 if (preen == 0) 123 printf("\n"); 124 fsmodified = 0; 125 lfdir = 0; 126 initbarea(&sblk); 127 initbarea(&asblk); 128 sblk.b_un.b_buf = malloc(SBLOCKSIZE); 129 sblock = malloc(SBLOCKSIZE); 130 asblk.b_un.b_buf = malloc(SBLOCKSIZE); 131 altsblock = malloc(SBLOCKSIZE); 132 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL || 133 sblock == NULL || altsblock == NULL) 134 errx(EEXIT, "cannot allocate space for superblock"); 135 if (!forceimage && (lp = getdisklabel(NULL, fsreadfd)) != NULL) 136 dev_bsize = secsize = lp->d_secsize; 137 else 138 dev_bsize = secsize = DEV_BSIZE; 139 /* 140 * Read in the superblock, looking for alternates if necessary 141 */ 142 if (readsb(1) == 0) { 143 if (bflag || preen || forceimage || 144 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_old_postblformat == FS_42POSTBLFMT) { 171 pwarn("%sile system is in 4.2BSD format, check skipped\n", 172 preen ? "f" : "** F"); 173 return -1; 174 } 175 if (sblock->fs_clean & FS_ISCLEAN) { 176 if (doskipclean) { 177 pwarn("%sile system is clean; not checking\n", 178 preen ? "f" : "** F"); 179 return (-1); 180 } 181 if (!preen && !doswap) 182 pwarn("** File system is already clean\n"); 183 } 184 maxfsblock = sblock->fs_size; 185 maxino = sblock->fs_ncg * sblock->fs_ipg; 186 sizepb = sblock->fs_bsize; 187 maxfilesize = sblock->fs_bsize * NDADDR - 1; 188 for (i = 0; i < NIADDR; i++) { 189 sizepb *= NINDIR(sblock); 190 maxfilesize += sizepb; 191 } 192 /* 193 * Check and potentially fix certain fields in the super block. 194 */ 195 if (sblock->fs_optim != FS_OPTTIME && sblock->fs_optim != FS_OPTSPACE) { 196 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 197 if (reply("SET TO DEFAULT") == 1) { 198 sblock->fs_optim = FS_OPTTIME; 199 sbdirty(); 200 } 201 } 202 if ((sblock->fs_minfree < 0 || sblock->fs_minfree > 99)) { 203 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 204 sblock->fs_minfree); 205 if (reply("SET TO DEFAULT") == 1) { 206 sblock->fs_minfree = 10; 207 sbdirty(); 208 } 209 } 210 if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && 211 (sblock->fs_old_interleave < 1 || 212 sblock->fs_old_interleave > sblock->fs_old_nsect)) { 213 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 214 sblock->fs_old_interleave); 215 sblock->fs_old_interleave = 1; 216 if (preen) 217 printf(" (FIXED)\n"); 218 if (preen || reply("SET TO DEFAULT") == 1) { 219 sbdirty(); 220 dirty(&asblk); 221 } 222 } 223 if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && 224 (sblock->fs_old_npsect < sblock->fs_old_nsect || 225 sblock->fs_old_npsect > sblock->fs_old_nsect*2)) { 226 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 227 sblock->fs_old_npsect); 228 sblock->fs_old_npsect = sblock->fs_old_nsect; 229 if (preen) 230 printf(" (FIXED)\n"); 231 if (preen || reply("SET TO DEFAULT") == 1) { 232 sbdirty(); 233 dirty(&asblk); 234 } 235 } 236 if (sblock->fs_bmask != ~(sblock->fs_bsize - 1)) { 237 pwarn("INCORRECT BMASK=0x%x IN SUPERBLOCK", 238 sblock->fs_bmask); 239 sblock->fs_bmask = ~(sblock->fs_bsize - 1); 240 if (preen) 241 printf(" (FIXED)\n"); 242 if (preen || reply("FIX") == 1) { 243 sbdirty(); 244 dirty(&asblk); 245 } 246 } 247 if (sblock->fs_fmask != ~(sblock->fs_fsize - 1)) { 248 pwarn("INCORRECT FMASK=0x%x IN SUPERBLOCK", 249 sblock->fs_fmask); 250 sblock->fs_fmask = ~(sblock->fs_fsize - 1); 251 if (preen) 252 printf(" (FIXED)\n"); 253 if (preen || reply("FIX") == 1) { 254 sbdirty(); 255 dirty(&asblk); 256 } 257 } 258 if (sblock->fs_old_inodefmt >= FS_44INODEFMT) { 259 if (sblock->fs_maxfilesize != maxfilesize) { 260 pwarn("INCORRECT MAXFILESIZE=%lld IN SUPERBLOCK", 261 (unsigned long long)sblock->fs_maxfilesize); 262 sblock->fs_maxfilesize = maxfilesize; 263 if (preen) 264 printf(" (FIXED)\n"); 265 if (preen || reply("FIX") == 1) { 266 sbdirty(); 267 dirty(&asblk); 268 } 269 } 270 if ((is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS2) 271 || 272 (!is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS1)) 273 { 274 pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", 275 sblock->fs_maxsymlinklen); 276 sblock->fs_maxsymlinklen = is_ufs2 ? 277 MAXSYMLINKLEN_UFS2 : MAXSYMLINKLEN_UFS1; 278 if (preen) 279 printf(" (FIXED)\n"); 280 if (preen || reply("FIX") == 1) { 281 sbdirty(); 282 dirty(&asblk); 283 } 284 } 285 if (sblock->fs_qbmask != ~sblock->fs_bmask) { 286 pwarn("INCORRECT QBMASK=%llx IN SUPERBLOCK", 287 (unsigned long long)sblock->fs_qbmask); 288 sblock->fs_qbmask = ~sblock->fs_bmask; 289 if (preen) 290 printf(" (FIXED)\n"); 291 if (preen || reply("FIX") == 1) { 292 sbdirty(); 293 dirty(&asblk); 294 } 295 } 296 if (sblock->fs_qfmask != ~sblock->fs_fmask) { 297 pwarn("INCORRECT QFMASK=%llx IN SUPERBLOCK", 298 (unsigned long long)sblock->fs_qfmask); 299 sblock->fs_qfmask = ~sblock->fs_fmask; 300 if (preen) 301 printf(" (FIXED)\n"); 302 if (preen || reply("FIX") == 1) { 303 sbdirty(); 304 dirty(&asblk); 305 } 306 } 307 newinofmt = 1; 308 } else { 309 sblock->fs_qbmask = ~sblock->fs_bmask; 310 sblock->fs_qfmask = ~sblock->fs_fmask; 311 newinofmt = 0; 312 } 313 /* 314 * Convert to new inode format. 315 */ 316 if (!is_ufs2 && cvtlevel >= 2 && 317 sblock->fs_old_inodefmt < FS_44INODEFMT) { 318 if (preen) 319 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 320 else if (!reply("CONVERT TO NEW INODE FORMAT")) 321 return(0); 322 doinglevel2++; 323 sblock->fs_old_inodefmt = FS_44INODEFMT; 324 sblock->fs_maxfilesize = maxfilesize; 325 sblock->fs_maxsymlinklen = MAXSYMLINKLEN_UFS1; 326 sblock->fs_qbmask = ~sblock->fs_bmask; 327 sblock->fs_qfmask = ~sblock->fs_fmask; 328 sbdirty(); 329 dirty(&asblk); 330 } 331 /* 332 * Convert to new cylinder group format. 333 */ 334 if (!is_ufs2 && cvtlevel >= 1 && 335 sblock->fs_old_postblformat == FS_42POSTBLFMT) { 336 if (preen) 337 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 338 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 339 return(0); 340 doinglevel1++; 341 sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT; 342 sblock->fs_old_nrpos = 0; 343 sbdirty(); 344 dirty(&asblk); 345 } 346 if (asblk.b_dirty && !bflag) { 347 memmove((struct fs*)sblk.b_un.b_fs, sblock, SBLOCKSIZE); 348 if (needswap) 349 ffs_sb_swap(sblock, (struct fs*)sblk.b_un.b_fs); 350 memmove(asblk.b_un.b_fs, sblk.b_un.b_fs, (size_t)sblock->fs_sbsize); 351 flush(fswritefd, &asblk); 352 } 353 /* 354 * read in the summary info. 355 */ 356 asked = 0; 357 sblock->fs_csp = (struct csum *)calloc(1, sblock->fs_cssize); 358 for (i = 0, j = 0; i < sblock->fs_cssize; i += sblock->fs_bsize, j++) { 359 size = sblock->fs_cssize - i < sblock->fs_bsize ? 360 sblock->fs_cssize - i : sblock->fs_bsize; 361 ccsp = (struct csum *)((char *)sblock->fs_csp + i); 362 if (bread(fsreadfd, (char *)ccsp, 363 fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag), 364 size) != 0 && !asked) { 365 pfatal("BAD SUMMARY INFORMATION"); 366 if (reply("CONTINUE") == 0) { 367 markclean = 0; 368 exit(EEXIT); 369 } 370 asked++; 371 } 372 if (doswap) { 373 ffs_csum_swap(ccsp, ccsp, size); 374 bwrite(fswritefd, (char *)ccsp, 375 fsbtodb(sblock, 376 sblock->fs_csaddr + j * sblock->fs_frag), 377 size); 378 } 379 if (needswap) 380 ffs_csum_swap(ccsp, ccsp, size); 381 } 382 /* 383 * allocate and initialize the necessary maps 384 */ 385 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 386 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 387 if (blockmap == NULL) { 388 printf("cannot alloc %u bytes for blockmap\n", 389 (unsigned)bmapsize); 390 goto badsblabel; 391 } 392 inostathead = calloc((unsigned)(sblock->fs_ncg), 393 sizeof(struct inostatlist)); 394 if (inostathead == NULL) { 395 printf("cannot alloc %u bytes for inostathead\n", 396 (unsigned)(sizeof(struct inostatlist) * (sblock->fs_ncg))); 397 goto badsblabel; 398 } 399 /* 400 * cs_ndir may be inaccurate, particularly if we're using the -b 401 * option, so set a minimum to prevent bogus subdirectory reconnects 402 * and really inefficient directory scans. 403 * Also set a maximum in case the value is too large. 404 */ 405 numdirs = sblock->fs_cstotal.cs_ndir; 406 if (numdirs < 1024) 407 numdirs = 1024; 408 if (numdirs > maxino + 1) 409 numdirs = maxino + 1; 410 dirhash = numdirs; 411 inplast = 0; 412 listmax = numdirs + 10; 413 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 414 sizeof(struct inoinfo *)); 415 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 416 sizeof(struct inoinfo *)); 417 if (inpsort == NULL || inphead == NULL) { 418 printf("cannot alloc %u bytes for inphead\n", 419 (unsigned)(numdirs * sizeof(struct inoinfo *))); 420 goto badsblabel; 421 } 422 cgrp = malloc(sblock->fs_cgsize); 423 if (cgrp == NULL) { 424 printf("cannot alloc %u bytes for cylinder group\n", 425 sblock->fs_cgsize); 426 goto badsblabel; 427 } 428 bufinit(); 429 if (sblock->fs_flags & FS_DOSOFTDEP) 430 usedsoftdep = 1; 431 else 432 usedsoftdep = 0; 433 434 { 435 struct partition *pp = 0; 436 if (!forceimage && lp) 437 pp = getdisklabelpart(dev,lp); 438 if (pp && (pp->p_fstype == FS_APPLEUFS)) { 439 isappleufs = 1; 440 } 441 } 442 if (readappleufs()) { 443 isappleufs = 1; 444 } 445 446 dirblksiz = DIRBLKSIZ; 447 if (isappleufs) 448 dirblksiz = APPLEUFS_DIRBLKSIZ; 449 450 if (debug) 451 printf("isappleufs = %d, dirblksiz = %d\n", isappleufs, dirblksiz); 452 453 return (1); 454 455 badsblabel: 456 markclean=0; 457 ckfini(); 458 return (0); 459 } 460 461 static int 462 readappleufs() 463 { 464 daddr_t label = APPLEUFS_LABEL_OFFSET / dev_bsize; 465 struct appleufslabel *appleufs; 466 int i; 467 468 /* XXX do we have to deal with APPLEUFS_LABEL_OFFSET not 469 * being block aligned (CD's?) 470 */ 471 if (bread(fsreadfd, (char *)appleufsblk.b_un.b_fs, label, (long)APPLEUFS_LABEL_SIZE) != 0) 472 return 0; 473 appleufsblk.b_bno = label; 474 appleufsblk.b_size = APPLEUFS_LABEL_SIZE; 475 476 appleufs = appleufsblk.b_un.b_appleufs; 477 478 if (ntohl(appleufs->ul_magic) != APPLEUFS_LABEL_MAGIC) { 479 if (!isappleufs) { 480 return 0; 481 } else { 482 pfatal("MISSING APPLEUFS VOLUME LABEL\n"); 483 if (reply("FIX") == 0) { 484 return 1; 485 } 486 ffs_appleufs_set(appleufs,NULL,-1); 487 appleufsdirty(); 488 } 489 } 490 491 if (ntohl(appleufs->ul_version) != APPLEUFS_LABEL_VERSION) { 492 pwarn("INCORRECT APPLE UFS VERSION NUMBER (%d should be %d)", 493 ntohl(appleufs->ul_version),APPLEUFS_LABEL_VERSION); 494 if (preen) { 495 printf(" (CORRECTED)\n"); 496 } 497 if (preen || reply("CORRECT")) { 498 appleufs->ul_version = htonl(APPLEUFS_LABEL_VERSION); 499 appleufsdirty(); 500 } 501 } 502 503 if (ntohs(appleufs->ul_namelen) > APPLEUFS_MAX_LABEL_NAME) { 504 pwarn("APPLE UFS LABEL NAME TOO LONG"); 505 if (preen) { 506 printf(" (TRUNCATED)\n"); 507 } 508 if (preen || reply("TRUNCATE")) { 509 appleufs->ul_namelen = htons(APPLEUFS_MAX_LABEL_NAME); 510 appleufsdirty(); 511 } 512 } 513 514 if (ntohs(appleufs->ul_namelen) == 0) { 515 pwarn("MISSING APPLE UFS LABEL NAME"); 516 if (preen) { 517 printf(" (FIXED)\n"); 518 } 519 if (preen || reply("FIX")) { 520 ffs_appleufs_set(appleufs,NULL,-1); 521 appleufsdirty(); 522 } 523 } 524 525 /* Scan name for first illegal character */ 526 for (i=0;i<ntohs(appleufs->ul_namelen);i++) { 527 if ((appleufs->ul_name[i] == '\0') || 528 (appleufs->ul_name[i] == ':') || 529 (appleufs->ul_name[i] == '/')) { 530 pwarn("APPLE UFS LABEL NAME CONTAINS ILLEGAL CHARACTER"); 531 if (preen) { 532 printf(" (TRUNCATED)\n"); 533 } 534 if (preen || reply("TRUNCATE")) { 535 appleufs->ul_namelen = i+1; 536 appleufsdirty(); 537 } 538 break; 539 } 540 } 541 542 /* Check the checksum last, because if anything else was wrong, 543 * then the checksum gets reset anyway. 544 */ 545 appleufs->ul_checksum = 0; 546 appleufs->ul_checksum = ffs_appleufs_cksum(appleufs); 547 if (appleufsblk.b_un.b_appleufs->ul_checksum != appleufs->ul_checksum) { 548 pwarn("INVALID APPLE UFS CHECKSUM (%#04x should be %#04x)", 549 appleufsblk.b_un.b_appleufs->ul_checksum, appleufs->ul_checksum); 550 if (preen) { 551 printf(" (CORRECTED)\n"); 552 } 553 if (preen || reply("CORRECT")) { 554 appleufsdirty(); 555 } else { 556 /* put the incorrect checksum back in place */ 557 appleufs->ul_checksum = appleufsblk.b_un.b_appleufs->ul_checksum; 558 } 559 } 560 return 1; 561 } 562 563 /* 564 * Detect byte order. Return 0 if valid magic found, -1 otherwise. 565 */ 566 static int 567 detect_byteorder(struct fs *fs) 568 { 569 if (fs->fs_magic == FS_UFS1_MAGIC || fs->fs_magic == FS_UFS2_MAGIC) { 570 if (endian == 0 || BYTE_ORDER == endian) { 571 needswap = 0; 572 doswap = do_blkswap = do_dirswap = 0; 573 } else { 574 needswap = 1; 575 doswap = do_blkswap = do_dirswap = 1; 576 } 577 return 0; 578 } else if (fs->fs_magic == bswap32(FS_UFS2_MAGIC) || 579 fs->fs_magic == bswap32(FS_UFS2_MAGIC)) { 580 if (endian == 0 || BYTE_ORDER != endian) { 581 needswap = 1; 582 doswap = do_blkswap = do_dirswap = 0; 583 } else { 584 needswap = 0; 585 doswap = do_blkswap = do_dirswap = 1; 586 } 587 return 0; 588 } 589 return -1; 590 } 591 592 /* 593 * Possible superblock locations ordered from most to least likely. 594 */ 595 static off_t sblock_try[] = SBLOCKSEARCH; 596 597 /* 598 * Read in the super block and its summary info. 599 */ 600 static int 601 readsb(listerr) 602 int listerr; 603 { 604 daddr_t super; 605 struct fs *fs; 606 int i; 607 608 if (bflag) { 609 super = bflag; 610 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, 611 (long)SBLOCKSIZE) != 0) 612 return (0); 613 fs = sblk.b_un.b_fs; 614 if (detect_byteorder(fs) < 0) { 615 badsb(listerr, "MAGIC NUMBER WRONG"); 616 return (0); 617 } 618 } else { 619 for (i = 0; sblock_try[i] != -1; i++) { 620 super = sblock_try[i] / dev_bsize; 621 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, 622 super, (long)SBLOCKSIZE) != 0) 623 continue; 624 fs = sblk.b_un.b_fs; 625 if (detect_byteorder(fs) == 0) 626 break; 627 } 628 if (sblock_try[i] == -1) { 629 badsb(listerr, "CAN'T FIND SUPERBLOCK"); 630 return (0); 631 } 632 } 633 if (doswap) { 634 if (preen) 635 errx(EEXIT, "incompatible options -B and -p"); 636 if (nflag) 637 errx(EEXIT, "incompatible options -B and -n"); 638 if (endian == LITTLE_ENDIAN) { 639 if (!reply("CONVERT TO LITTLE ENDIAN")) 640 return 0; 641 } else if (endian == BIG_ENDIAN) { 642 if (!reply("CONVERT TO BIG ENDIAN")) 643 return 0; 644 } else 645 pfatal("INTERNAL ERROR: unknown endian"); 646 } 647 if (needswap) 648 printf("** Swapped byte order\n"); 649 /* swap SB byte order if asked */ 650 if (doswap) 651 ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs); 652 653 memmove(sblock, sblk.b_un.b_fs, SBLOCKSIZE); 654 if (needswap) 655 ffs_sb_swap(sblk.b_un.b_fs, sblock); 656 657 is_ufs2 = sblock->fs_magic == FS_UFS2_MAGIC; 658 659 /* 660 * run a few consistency checks of the super block 661 */ 662 if (sblock->fs_sbsize > SBLOCKSIZE) 663 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 664 /* 665 * Compute block size that the filesystem is based on, 666 * according to fsbtodb, and adjust superblock block number 667 * so we can tell if this is an alternate later. 668 */ 669 super *= dev_bsize; 670 dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1); 671 sblk.b_bno = super / dev_bsize; 672 sblk.b_size = SBLOCKSIZE; 673 if (bflag) 674 goto out; 675 /* 676 * Set all possible fields that could differ, then do check 677 * of whole super block against an alternate super block-> 678 * When an alternate super-block is specified this check is skipped. 679 */ 680 getblk(&asblk, cgsblock(sblock, sblock->fs_ncg - 1), sblock->fs_sbsize); 681 if (asblk.b_errs) 682 return (0); 683 /* swap SB byte order if asked */ 684 if (doswap) 685 ffs_sb_swap(asblk.b_un.b_fs, asblk.b_un.b_fs); 686 687 memmove(altsblock, asblk.b_un.b_fs, sblock->fs_sbsize); 688 if (needswap) 689 ffs_sb_swap(asblk.b_un.b_fs, altsblock); 690 if (cmpsblks(sblock, altsblock)) { 691 badsb(listerr, 692 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 693 return (0); 694 } 695 out: 696 /* 697 * If not yet done, update UFS1 superblock with new wider fields. 698 */ 699 if (sblock->fs_magic == FS_UFS1_MAGIC) { 700 if (sblock->fs_maxbsize != sblock->fs_bsize || 701 sblock->fs_time < sblock->fs_old_time) { 702 sblock->fs_cstotal.cs_ndir = 703 sblock->fs_old_cstotal.cs_ndir; 704 sblock->fs_cstotal.cs_nbfree = 705 sblock->fs_old_cstotal.cs_nbfree; 706 sblock->fs_cstotal.cs_nifree = 707 sblock->fs_old_cstotal.cs_nifree; 708 sblock->fs_cstotal.cs_nffree = 709 sblock->fs_old_cstotal.cs_nffree; 710 } 711 if (sblock->fs_maxbsize != sblock->fs_bsize) { 712 sblock->fs_maxbsize = sblock->fs_bsize; 713 sblock->fs_time = sblock->fs_old_time; 714 sblock->fs_size = sblock->fs_old_size; 715 sblock->fs_dsize = sblock->fs_old_dsize; 716 sblock->fs_csaddr = sblock->fs_old_csaddr; 717 } 718 } 719 720 /* Now we know the SB is valid, we can write it back if needed */ 721 if (doswap) { 722 sbdirty(); 723 dirty(&asblk); 724 } 725 havesb = 1; 726 return (1); 727 } 728 729 int 730 cmpsblks(const struct fs *sb, struct fs *asb) 731 { 732 if (asb->fs_sblkno != sb->fs_sblkno || 733 asb->fs_cblkno != sb->fs_cblkno || 734 asb->fs_iblkno != sb->fs_iblkno || 735 asb->fs_dblkno != sb->fs_dblkno || 736 asb->fs_ncg != sb->fs_ncg || 737 asb->fs_bsize != sb->fs_bsize || 738 asb->fs_fsize != sb->fs_fsize || 739 asb->fs_frag != sb->fs_frag || 740 asb->fs_bmask != sb->fs_bmask || 741 asb->fs_fmask != sb->fs_fmask || 742 asb->fs_bshift != sb->fs_bshift || 743 asb->fs_fshift != sb->fs_fshift || 744 asb->fs_fragshift != sb->fs_fragshift || 745 asb->fs_fsbtodb != sb->fs_fsbtodb || 746 asb->fs_sbsize != sb->fs_sbsize || 747 asb->fs_nindir != sb->fs_nindir || 748 asb->fs_inopb != sb->fs_inopb || 749 asb->fs_cssize != sb->fs_cssize || 750 asb->fs_ipg != sb->fs_ipg || 751 asb->fs_fpg != sb->fs_fpg || 752 asb->fs_magic != sb->fs_magic) 753 return 1; 754 return 0; 755 } 756 757 static void 758 badsb(listerr, s) 759 int listerr; 760 char *s; 761 { 762 763 if (!listerr) 764 return; 765 if (preen) 766 printf("%s: ", cdevname()); 767 pfatal("BAD SUPER BLOCK: %s\n", s); 768 } 769 770 /* 771 * Calculate a prototype superblock based on information in the disk label. 772 * When done the cgsblock macro can be calculated and the fs_ncg field 773 * can be used. Do NOT attempt to use other macros without verifying that 774 * their needed information is available! 775 */ 776 static int 777 calcsb(dev, devfd, fs) 778 const char *dev; 779 int devfd; 780 struct fs *fs; 781 { 782 struct disklabel *lp; 783 struct partition *pp; 784 int i, nspf; 785 786 lp = getdisklabel(dev, devfd); 787 pp = getdisklabelpart(dev,lp); 788 if (pp == 0) { 789 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 790 return (0); 791 } 792 if ((pp->p_fstype != FS_BSDFFS) && (pp->p_fstype != FS_APPLEUFS)) { 793 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 794 dev, pp->p_fstype < FSMAXTYPES ? 795 fstypenames[pp->p_fstype] : "unknown"); 796 return (0); 797 } 798 /* avoid divide by 0 */ 799 if (pp->p_fsize == 0 || pp->p_frag == 0) 800 return (0); 801 memset(fs, 0, sizeof(struct fs)); 802 fs->fs_fsize = pp->p_fsize; 803 fs->fs_frag = pp->p_frag; 804 fs->fs_size = pp->p_size; 805 fs->fs_sblkno = roundup( 806 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 807 fs->fs_frag); 808 nspf = fs->fs_fsize / lp->d_secsize; 809 fs->fs_old_nspf = nspf; 810 for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1) 811 fs->fs_fsbtodb++; 812 dev_bsize = lp->d_secsize; 813 if (fs->fs_magic == FS_UFS2_MAGIC) { 814 fs->fs_fpg = pp->p_cpg; 815 fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg); 816 } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ { 817 fs->fs_old_cpg = pp->p_cpg; 818 fs->fs_old_cgmask = 0xffffffff; 819 for (i = lp->d_ntracks; i > 1; i >>= 1) 820 fs->fs_old_cgmask <<= 1; 821 if (!POWEROF2(lp->d_ntracks)) 822 fs->fs_old_cgmask <<= 1; 823 fs->fs_old_cgoffset = roundup( 824 howmany(lp->d_nsectors, nspf), fs->fs_frag); 825 fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf; 826 fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl, 827 fs->fs_old_cpg); 828 } 829 return (1); 830 } 831 832 static struct disklabel * 833 getdisklabel(s, fd) 834 const char *s; 835 int fd; 836 { 837 static struct disklabel lab; 838 839 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 840 if (s == NULL) 841 return ((struct disklabel *)NULL); 842 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 843 errx(EEXIT, "%s: can't read disk label", s); 844 } 845 return (&lab); 846 } 847 848 static struct partition * 849 getdisklabelpart(dev, lp) 850 const char *dev; 851 struct disklabel *lp; 852 { 853 char *cp; 854 855 cp = strchr(dev, '\0') - 1; 856 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'p')) && !isdigit(*cp)) { 857 return 0; 858 } 859 if (isdigit(*cp)) 860 return &lp->d_partitions[0]; 861 else 862 return &lp->d_partitions[*cp - 'a']; 863 } 864 865
Indexes created Fri Sep 26 08:10:20 GMT 2025