setup.c revision 1.24
1 /* $NetBSD: setup.c,v 1.24 1996/05/21 17:25:56 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94"; 39 #else 40 static char rcsid[] = "$NetBSD: setup.c,v 1.24 1996/05/21 17:25:56 mycroft Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #define DKTYPENAMES 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <ufs/ufs/dinode.h> 48 #include <ufs/ffs/fs.h> 49 #include <sys/stat.h> 50 #include <sys/ioctl.h> 51 #include <sys/disklabel.h> 52 #include <sys/file.h> 53 54 #include <errno.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <ctype.h> 59 #include "fsck.h" 60 #include "extern.h" 61 62 struct bufarea asblk; 63 #define altsblock (*asblk.b_un.b_fs) 64 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 65 66 void badsb __P((int, char *)); 67 int calcsb __P((char *, int, struct fs *)); 68 struct disklabel *getdisklabel(); 69 int readsb __P((int)); 70 71 int 72 setup(dev) 73 char *dev; 74 { 75 long cg, size, asked, i, j; 76 long bmapsize; 77 struct disklabel *lp; 78 off_t sizepb; 79 struct stat statb; 80 struct fs proto; 81 int doskipclean; 82 u_int64_t maxfilesize; 83 84 havesb = 0; 85 fswritefd = -1; 86 doskipclean = skipclean; 87 if (stat(dev, &statb) < 0) { 88 printf("Can't stat %s: %s\n", dev, strerror(errno)); 89 return (0); 90 } 91 if (!S_ISCHR(statb.st_mode)) { 92 pfatal("%s is not a character device", dev); 93 if (reply("CONTINUE") == 0) 94 return (0); 95 } 96 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 97 printf("Can't open %s: %s\n", dev, strerror(errno)); 98 return (0); 99 } 100 if (preen == 0) 101 printf("** %s", dev); 102 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 103 fswritefd = -1; 104 if (preen) 105 pfatal("NO WRITE ACCESS"); 106 printf(" (NO WRITE)"); 107 } 108 if (preen == 0) 109 printf("\n"); 110 fsmodified = 0; 111 lfdir = 0; 112 initbarea(&sblk); 113 initbarea(&asblk); 114 sblk.b_un.b_buf = malloc(SBSIZE); 115 asblk.b_un.b_buf = malloc(SBSIZE); 116 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 117 errexit("cannot allocate space for superblock\n"); 118 if (lp = getdisklabel((char *)NULL, fsreadfd)) 119 dev_bsize = secsize = lp->d_secsize; 120 else 121 dev_bsize = secsize = DEV_BSIZE; 122 /* 123 * Read in the superblock, looking for alternates if necessary 124 */ 125 if (readsb(1) == 0) { 126 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 127 return(0); 128 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 129 return (0); 130 for (cg = 0; cg < proto.fs_ncg; cg++) { 131 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 132 if (readsb(0) != 0) 133 break; 134 } 135 if (cg >= proto.fs_ncg) { 136 printf("%s %s\n%s %s\n%s %s\n", 137 "SEARCH FOR ALTERNATE SUPER-BLOCK", 138 "FAILED. YOU MUST USE THE", 139 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 140 "LOCATION OF AN ALTERNATE", 141 "SUPER-BLOCK TO SUPPLY NEEDED", 142 "INFORMATION; SEE fsck_ffs(8)."); 143 return(0); 144 } 145 doskipclean = 0; 146 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 147 } 148 if (debug) 149 printf("clean = %d\n", sblock.fs_clean); 150 if (sblock.fs_clean & FS_ISCLEAN) { 151 if (doskipclean) { 152 pwarn("%sile system is clean; not checking\n", 153 preen ? "f" : "** F"); 154 return (-1); 155 } 156 if (!preen) 157 pwarn("** File system is already clean\n"); 158 } 159 maxfsblock = sblock.fs_size; 160 maxino = sblock.fs_ncg * sblock.fs_ipg; 161 sizepb = sblock.fs_bsize; 162 maxfilesize = sblock.fs_bsize * NDADDR - 1; 163 for (i = 0; i < NIADDR; i++) { 164 sizepb *= NINDIR(&sblock); 165 maxfilesize += sizepb; 166 } 167 /* 168 * Check and potentially fix certain fields in the super block. 169 */ 170 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 171 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 172 if (reply("SET TO DEFAULT") == 1) { 173 sblock.fs_optim = FS_OPTTIME; 174 sbdirty(); 175 } 176 } 177 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 178 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 179 sblock.fs_minfree); 180 if (reply("SET TO DEFAULT") == 1) { 181 sblock.fs_minfree = 10; 182 sbdirty(); 183 } 184 } 185 if (sblock.fs_interleave < 1 || 186 sblock.fs_interleave > sblock.fs_nsect) { 187 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 188 sblock.fs_interleave); 189 sblock.fs_interleave = 1; 190 if (preen) 191 printf(" (FIXED)\n"); 192 if (preen || reply("SET TO DEFAULT") == 1) { 193 sbdirty(); 194 dirty(&asblk); 195 } 196 } 197 if (sblock.fs_npsect < sblock.fs_nsect || 198 sblock.fs_npsect > sblock.fs_nsect*2) { 199 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 200 sblock.fs_npsect); 201 sblock.fs_npsect = sblock.fs_nsect; 202 if (preen) 203 printf(" (FIXED)\n"); 204 if (preen || reply("SET TO DEFAULT") == 1) { 205 sbdirty(); 206 dirty(&asblk); 207 } 208 } 209 if (sblock.fs_bmask != ~(sblock.fs_bsize - 1)) { 210 pwarn("INVALID BMASK=%d IN SUPERBLOCK", 211 sblock.fs_bmask); 212 sblock.fs_bmask = ~(sblock.fs_bsize - 1); 213 if (preen) 214 printf(" (FIXED)\n"); 215 if (preen || reply("FIX") == 1) { 216 sbdirty(); 217 dirty(&asblk); 218 } 219 } 220 if (sblock.fs_fmask != ~(sblock.fs_fsize - 1)) { 221 pwarn("INVALID FMASK=%d IN SUPERBLOCK", 222 sblock.fs_fmask); 223 sblock.fs_fmask = ~(sblock.fs_fsize - 1); 224 if (preen) 225 printf(" (FIXED)\n"); 226 if (preen || reply("FIX") == 1) { 227 sbdirty(); 228 dirty(&asblk); 229 } 230 } 231 if (sblock.fs_inodefmt >= FS_44INODEFMT) { 232 if (sblock.fs_maxfilesize != maxfilesize) { 233 pwarn("INCORRECT MAXFILESIZE=%qd IN SUPERBLOCK", 234 sblock.fs_maxfilesize); 235 sblock.fs_maxfilesize = maxfilesize; 236 if (preen) 237 printf(" (FIXED)\n"); 238 if (preen || reply("FIX") == 1) { 239 sbdirty(); 240 dirty(&asblk); 241 } 242 } 243 if (sblock.fs_maxsymlinklen != MAXSYMLINKLEN) { 244 pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", 245 sblock.fs_maxsymlinklen); 246 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 247 if (preen) 248 printf(" (FIXED)\n"); 249 if (preen || reply("FIX") == 1) { 250 sbdirty(); 251 dirty(&asblk); 252 } 253 } 254 if (sblock.fs_qbmask != ~sblock.fs_bmask) { 255 pwarn("INCORRECT QBMASK=%qd IN SUPERBLOCK", 256 sblock.fs_qbmask); 257 sblock.fs_qbmask = ~sblock.fs_bmask; 258 if (preen) 259 printf(" (FIXED)\n"); 260 if (preen || reply("FIX") == 1) { 261 sbdirty(); 262 dirty(&asblk); 263 } 264 } 265 if (sblock.fs_qfmask != ~sblock.fs_fmask) { 266 pwarn("INCORRECT QFMASK=%qd IN SUPERBLOCK", 267 sblock.fs_qfmask); 268 sblock.fs_qfmask = ~sblock.fs_fmask; 269 if (preen) 270 printf(" (FIXED)\n"); 271 if (preen || reply("FIX") == 1) { 272 sbdirty(); 273 dirty(&asblk); 274 } 275 } 276 newinofmt = 1; 277 } else { 278 sblock.fs_qbmask = ~sblock.fs_bmask; 279 sblock.fs_qfmask = ~sblock.fs_fmask; 280 newinofmt = 0; 281 } 282 /* 283 * Convert to new inode format. 284 */ 285 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 286 if (preen) 287 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 288 else if (!reply("CONVERT TO NEW INODE FORMAT")) 289 return(0); 290 doinglevel2++; 291 sblock.fs_inodefmt = FS_44INODEFMT; 292 sblock.fs_maxfilesize = maxfilesize; 293 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 294 sblock.fs_qbmask = ~sblock.fs_bmask; 295 sblock.fs_qfmask = ~sblock.fs_fmask; 296 sbdirty(); 297 dirty(&asblk); 298 } 299 /* 300 * Convert to new cylinder group format. 301 */ 302 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 303 if (preen) 304 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 305 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 306 return(0); 307 doinglevel1++; 308 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 309 sblock.fs_nrpos = 8; 310 sblock.fs_postbloff = 311 (char *)(&sblock.fs_opostbl[0][0]) - 312 (char *)(&sblock.fs_firstfield); 313 sblock.fs_rotbloff = &sblock.fs_space[0] - 314 (u_char *)(&sblock.fs_firstfield); 315 sblock.fs_cgsize = 316 fragroundup(&sblock, CGSIZE(&sblock)); 317 sbdirty(); 318 dirty(&asblk); 319 } 320 if (asblk.b_dirty && !bflag) { 321 memcpy(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 322 flush(fswritefd, &asblk); 323 } 324 /* 325 * read in the summary info. 326 */ 327 asked = 0; 328 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 329 size = sblock.fs_cssize - i < sblock.fs_bsize ? 330 sblock.fs_cssize - i : sblock.fs_bsize; 331 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 332 if (bread(fsreadfd, (char *)sblock.fs_csp[j], 333 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 334 size) != 0 && !asked) { 335 pfatal("BAD SUMMARY INFORMATION"); 336 if (reply("CONTINUE") == 0) 337 errexit(""); 338 asked++; 339 } 340 } 341 /* 342 * allocate and initialize the necessary maps 343 */ 344 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 345 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 346 if (blockmap == NULL) { 347 printf("cannot alloc %u bytes for blockmap\n", 348 (unsigned)bmapsize); 349 goto badsblabel; 350 } 351 statemap = calloc((unsigned)(maxino + 1), sizeof(char)); 352 if (statemap == NULL) { 353 printf("cannot alloc %u bytes for statemap\n", 354 (unsigned)(maxino + 1)); 355 goto badsblabel; 356 } 357 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 358 if (typemap == NULL) { 359 printf("cannot alloc %u bytes for typemap\n", 360 (unsigned)(maxino + 1)); 361 goto badsblabel; 362 } 363 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 364 if (lncntp == NULL) { 365 printf("cannot alloc %u bytes for lncntp\n", 366 (unsigned)(maxino + 1) * sizeof(int16_t)); 367 goto badsblabel; 368 } 369 numdirs = sblock.fs_cstotal.cs_ndir; 370 inplast = 0; 371 listmax = numdirs + 10; 372 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 373 sizeof(struct inoinfo *)); 374 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 375 sizeof(struct inoinfo *)); 376 if (inpsort == NULL || inphead == NULL) { 377 printf("cannot alloc %u bytes for inphead\n", 378 (unsigned)numdirs * sizeof(struct inoinfo *)); 379 goto badsblabel; 380 } 381 bufinit(); 382 return (1); 383 384 badsblabel: 385 ckfini(0); 386 return (0); 387 } 388 389 /* 390 * Read in the super block and its summary info. 391 */ 392 int 393 readsb(listerr) 394 int listerr; 395 { 396 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 397 398 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 399 return (0); 400 sblk.b_bno = super; 401 sblk.b_size = SBSIZE; 402 /* 403 * run a few consistency checks of the super block 404 */ 405 if (sblock.fs_magic != FS_MAGIC) 406 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 407 if (sblock.fs_ncg < 1) 408 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 409 if (sblock.fs_cpg < 1) 410 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 411 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 412 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 413 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 414 if (sblock.fs_sbsize > SBSIZE) 415 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 416 /* 417 * Compute block size that the filesystem is based on, 418 * according to fsbtodb, and adjust superblock block number 419 * so we can tell if this is an alternate later. 420 */ 421 super *= dev_bsize; 422 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 423 sblk.b_bno = super / dev_bsize; 424 if (bflag) { 425 havesb = 1; 426 return (1); 427 } 428 /* 429 * Set all possible fields that could differ, then do check 430 * of whole super block against an alternate super block. 431 * When an alternate super-block is specified this check is skipped. 432 */ 433 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 434 if (asblk.b_errs) 435 return (0); 436 altsblock.fs_firstfield = sblock.fs_firstfield; 437 altsblock.fs_fscktime = sblock.fs_fscktime; 438 altsblock.fs_time = sblock.fs_time; 439 altsblock.fs_cstotal = sblock.fs_cstotal; 440 altsblock.fs_cgrotor = sblock.fs_cgrotor; 441 altsblock.fs_fmod = sblock.fs_fmod; 442 altsblock.fs_clean = sblock.fs_clean; 443 altsblock.fs_ronly = sblock.fs_ronly; 444 altsblock.fs_flags = sblock.fs_flags; 445 altsblock.fs_maxcontig = sblock.fs_maxcontig; 446 altsblock.fs_minfree = sblock.fs_minfree; 447 altsblock.fs_optim = sblock.fs_optim; 448 altsblock.fs_rotdelay = sblock.fs_rotdelay; 449 altsblock.fs_maxbpg = sblock.fs_maxbpg; 450 memcpy(altsblock.fs_csp, sblock.fs_csp, 451 sizeof sblock.fs_csp); 452 altsblock.fs_maxcluster = sblock.fs_maxcluster; 453 memcpy(altsblock.fs_fsmnt, sblock.fs_fsmnt, 454 sizeof sblock.fs_fsmnt); 455 memcpy(altsblock.fs_sparecon, sblock.fs_sparecon, 456 sizeof sblock.fs_sparecon); 457 /* 458 * The following should not have to be copied. 459 */ 460 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 461 altsblock.fs_interleave = sblock.fs_interleave; 462 altsblock.fs_npsect = sblock.fs_npsect; 463 altsblock.fs_nrpos = sblock.fs_nrpos; 464 altsblock.fs_state = sblock.fs_state; 465 altsblock.fs_qbmask = sblock.fs_qbmask; 466 altsblock.fs_qfmask = sblock.fs_qfmask; 467 altsblock.fs_state = sblock.fs_state; 468 altsblock.fs_maxfilesize = sblock.fs_maxfilesize; 469 if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) { 470 if (debug) { 471 long *nlp, *olp, *endlp; 472 473 printf("superblock mismatches\n"); 474 nlp = (long *)&altsblock; 475 olp = (long *)&sblock; 476 endlp = olp + (sblock.fs_sbsize / sizeof *olp); 477 for ( ; olp < endlp; olp++, nlp++) { 478 if (*olp == *nlp) 479 continue; 480 printf("offset %d, original %d, alternate %d\n", 481 olp - (long *)&sblock, *olp, *nlp); 482 } 483 } 484 badsb(listerr, 485 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 486 return (0); 487 } 488 havesb = 1; 489 return (1); 490 } 491 492 void 493 badsb(listerr, s) 494 int listerr; 495 char *s; 496 { 497 498 if (!listerr) 499 return; 500 if (preen) 501 printf("%s: ", cdevname); 502 pfatal("BAD SUPER BLOCK: %s\n", s); 503 } 504 505 /* 506 * Calculate a prototype superblock based on information in the disk label. 507 * When done the cgsblock macro can be calculated and the fs_ncg field 508 * can be used. Do NOT attempt to use other macros without verifying that 509 * their needed information is available! 510 */ 511 int 512 calcsb(dev, devfd, fs) 513 char *dev; 514 int devfd; 515 register struct fs *fs; 516 { 517 register struct disklabel *lp; 518 register struct partition *pp; 519 register char *cp; 520 int i; 521 522 cp = strchr(dev, '\0') - 1; 523 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 524 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 525 return (0); 526 } 527 lp = getdisklabel(dev, devfd); 528 if (isdigit(*cp)) 529 pp = &lp->d_partitions[0]; 530 else 531 pp = &lp->d_partitions[*cp - 'a']; 532 if (pp->p_fstype != FS_BSDFFS) { 533 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 534 dev, pp->p_fstype < FSMAXTYPES ? 535 fstypenames[pp->p_fstype] : "unknown"); 536 return (0); 537 } 538 memset(fs, 0, sizeof(struct fs)); 539 fs->fs_fsize = pp->p_fsize; 540 fs->fs_frag = pp->p_frag; 541 fs->fs_cpg = pp->p_cpg; 542 fs->fs_size = pp->p_size; 543 fs->fs_ntrak = lp->d_ntracks; 544 fs->fs_nsect = lp->d_nsectors; 545 fs->fs_spc = lp->d_secpercyl; 546 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 547 fs->fs_sblkno = roundup( 548 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 549 fs->fs_frag); 550 fs->fs_cgmask = 0xffffffff; 551 for (i = fs->fs_ntrak; i > 1; i >>= 1) 552 fs->fs_cgmask <<= 1; 553 if (!POWEROF2(fs->fs_ntrak)) 554 fs->fs_cgmask <<= 1; 555 fs->fs_cgoffset = roundup( 556 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 557 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 558 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 559 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 560 fs->fs_fsbtodb++; 561 dev_bsize = lp->d_secsize; 562 return (1); 563 } 564 565 struct disklabel * 566 getdisklabel(s, fd) 567 char *s; 568 int fd; 569 { 570 static struct disklabel lab; 571 572 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 573 if (s == NULL) 574 return ((struct disklabel *)NULL); 575 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 576 errexit("%s: can't read disk label\n", s); 577 } 578 return (&lab); 579 } 580
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