1 /* $NetBSD: setup.c,v 1.27 1996/09/27 22:45:19 christos 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 1.27 1996/09/27 22:45:19 christos 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 60 #include "fsck.h" 61 #include "extern.h" 62 #include "fsutil.h" 63 64 struct bufarea asblk; 65 #define altsblock (*asblk.b_un.b_fs) 66 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 67 68 void badsb __P((int, char *)); 69 int calcsb __P((char *, int, struct fs *)); 70 static struct disklabel *getdisklabel __P((char *, int)); 71 static int readsb __P((int)); 72 73 int 74 setup(dev) 75 char *dev; 76 { 77 long cg, size, asked, i, j; 78 long bmapsize; 79 struct disklabel *lp; 80 off_t sizepb; 81 struct stat statb; 82 struct fs proto; 83 int doskipclean; 84 u_int64_t maxfilesize; 85 86 havesb = 0; 87 fswritefd = -1; 88 doskipclean = skipclean; 89 if (stat(dev, &statb) < 0) { 90 printf("Can't stat %s: %s\n", dev, strerror(errno)); 91 return (0); 92 } 93 if (!S_ISCHR(statb.st_mode)) { 94 pfatal("%s is not a character device", dev); 95 if (reply("CONTINUE") == 0) 96 return (0); 97 } 98 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 99 printf("Can't open %s: %s\n", dev, strerror(errno)); 100 return (0); 101 } 102 if (preen == 0) 103 printf("** %s", dev); 104 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 105 fswritefd = -1; 106 if (preen) 107 pfatal("NO WRITE ACCESS"); 108 printf(" (NO WRITE)"); 109 } 110 if (preen == 0) 111 printf("\n"); 112 fsmodified = 0; 113 lfdir = 0; 114 initbarea(&sblk); 115 initbarea(&asblk); 116 sblk.b_un.b_buf = malloc(SBSIZE); 117 asblk.b_un.b_buf = malloc(SBSIZE); 118 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 119 errexit("cannot allocate space for superblock\n"); 120 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 121 dev_bsize = secsize = lp->d_secsize; 122 else 123 dev_bsize = secsize = DEV_BSIZE; 124 /* 125 * Read in the superblock, looking for alternates if necessary 126 */ 127 if (readsb(1) == 0) { 128 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 129 return(0); 130 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 131 return (0); 132 for (cg = 0; cg < proto.fs_ncg; cg++) { 133 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 134 if (readsb(0) != 0) 135 break; 136 } 137 if (cg >= proto.fs_ncg) { 138 printf("%s %s\n%s %s\n%s %s\n", 139 "SEARCH FOR ALTERNATE SUPER-BLOCK", 140 "FAILED. YOU MUST USE THE", 141 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 142 "LOCATION OF AN ALTERNATE", 143 "SUPER-BLOCK TO SUPPLY NEEDED", 144 "INFORMATION; SEE fsck_ffs(8)."); 145 return(0); 146 } 147 doskipclean = 0; 148 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 149 } 150 if (debug) 151 printf("clean = %d\n", sblock.fs_clean); 152 if (sblock.fs_clean & FS_ISCLEAN) { 153 if (doskipclean) { 154 pwarn("%sile system is clean; not checking\n", 155 preen ? "f" : "** F"); 156 return (-1); 157 } 158 if (!preen) 159 pwarn("** File system is already clean\n"); 160 } 161 maxfsblock = sblock.fs_size; 162 maxino = sblock.fs_ncg * sblock.fs_ipg; 163 sizepb = sblock.fs_bsize; 164 maxfilesize = sblock.fs_bsize * NDADDR - 1; 165 for (i = 0; i < NIADDR; i++) { 166 sizepb *= NINDIR(&sblock); 167 maxfilesize += sizepb; 168 } 169 /* 170 * Check and potentially fix certain fields in the super block. 171 */ 172 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 173 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 174 if (reply("SET TO DEFAULT") == 1) { 175 sblock.fs_optim = FS_OPTTIME; 176 sbdirty(); 177 } 178 } 179 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 180 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 181 sblock.fs_minfree); 182 if (reply("SET TO DEFAULT") == 1) { 183 sblock.fs_minfree = 10; 184 sbdirty(); 185 } 186 } 187 if (sblock.fs_interleave < 1 || 188 sblock.fs_interleave > sblock.fs_nsect) { 189 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 190 sblock.fs_interleave); 191 sblock.fs_interleave = 1; 192 if (preen) 193 printf(" (FIXED)\n"); 194 if (preen || reply("SET TO DEFAULT") == 1) { 195 sbdirty(); 196 dirty(&asblk); 197 } 198 } 199 if (sblock.fs_npsect < sblock.fs_nsect || 200 sblock.fs_npsect > sblock.fs_nsect*2) { 201 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 202 sblock.fs_npsect); 203 sblock.fs_npsect = sblock.fs_nsect; 204 if (preen) 205 printf(" (FIXED)\n"); 206 if (preen || reply("SET TO DEFAULT") == 1) { 207 sbdirty(); 208 dirty(&asblk); 209 } 210 } 211 if (sblock.fs_bmask != ~(sblock.fs_bsize - 1)) { 212 pwarn("INCORRECT BMASK=%x IN SUPERBLOCK", 213 sblock.fs_bmask); 214 sblock.fs_bmask = ~(sblock.fs_bsize - 1); 215 if (preen) 216 printf(" (FIXED)\n"); 217 if (preen || reply("FIX") == 1) { 218 sbdirty(); 219 dirty(&asblk); 220 } 221 } 222 if (sblock.fs_fmask != ~(sblock.fs_fsize - 1)) { 223 pwarn("INCORRECT FMASK=%x IN SUPERBLOCK", 224 sblock.fs_fmask); 225 sblock.fs_fmask = ~(sblock.fs_fsize - 1); 226 if (preen) 227 printf(" (FIXED)\n"); 228 if (preen || reply("FIX") == 1) { 229 sbdirty(); 230 dirty(&asblk); 231 } 232 } 233 if (sblock.fs_inodefmt >= FS_44INODEFMT) { 234 if (sblock.fs_maxfilesize != maxfilesize) { 235 pwarn("INCORRECT MAXFILESIZE=%qd IN SUPERBLOCK", 236 sblock.fs_maxfilesize); 237 sblock.fs_maxfilesize = maxfilesize; 238 if (preen) 239 printf(" (FIXED)\n"); 240 if (preen || reply("FIX") == 1) { 241 sbdirty(); 242 dirty(&asblk); 243 } 244 } 245 if (sblock.fs_maxsymlinklen != MAXSYMLINKLEN) { 246 pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", 247 sblock.fs_maxsymlinklen); 248 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 249 if (preen) 250 printf(" (FIXED)\n"); 251 if (preen || reply("FIX") == 1) { 252 sbdirty(); 253 dirty(&asblk); 254 } 255 } 256 if (sblock.fs_qbmask != ~sblock.fs_bmask) { 257 pwarn("INCORRECT QBMASK=%qx IN SUPERBLOCK", 258 sblock.fs_qbmask); 259 sblock.fs_qbmask = ~sblock.fs_bmask; 260 if (preen) 261 printf(" (FIXED)\n"); 262 if (preen || reply("FIX") == 1) { 263 sbdirty(); 264 dirty(&asblk); 265 } 266 } 267 if (sblock.fs_qfmask != ~sblock.fs_fmask) { 268 pwarn("INCORRECT QFMASK=%qx IN SUPERBLOCK", 269 sblock.fs_qfmask); 270 sblock.fs_qfmask = ~sblock.fs_fmask; 271 if (preen) 272 printf(" (FIXED)\n"); 273 if (preen || reply("FIX") == 1) { 274 sbdirty(); 275 dirty(&asblk); 276 } 277 } 278 newinofmt = 1; 279 } else { 280 sblock.fs_qbmask = ~sblock.fs_bmask; 281 sblock.fs_qfmask = ~sblock.fs_fmask; 282 newinofmt = 0; 283 } 284 /* 285 * Convert to new inode format. 286 */ 287 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 288 if (preen) 289 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 290 else if (!reply("CONVERT TO NEW INODE FORMAT")) 291 return(0); 292 doinglevel2++; 293 sblock.fs_inodefmt = FS_44INODEFMT; 294 sblock.fs_maxfilesize = maxfilesize; 295 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 296 sblock.fs_qbmask = ~sblock.fs_bmask; 297 sblock.fs_qfmask = ~sblock.fs_fmask; 298 sbdirty(); 299 dirty(&asblk); 300 } 301 /* 302 * Convert to new cylinder group format. 303 */ 304 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 305 if (preen) 306 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 307 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 308 return(0); 309 doinglevel1++; 310 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 311 sblock.fs_nrpos = 8; 312 sblock.fs_postbloff = 313 (char *)(&sblock.fs_opostbl[0][0]) - 314 (char *)(&sblock.fs_firstfield); 315 sblock.fs_rotbloff = &sblock.fs_space[0] - 316 (u_char *)(&sblock.fs_firstfield); 317 sblock.fs_cgsize = 318 fragroundup(&sblock, CGSIZE(&sblock)); 319 sbdirty(); 320 dirty(&asblk); 321 } 322 if (asblk.b_dirty && !bflag) { 323 memcpy(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 324 flush(fswritefd, &asblk); 325 } 326 /* 327 * read in the summary info. 328 */ 329 asked = 0; 330 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 331 size = sblock.fs_cssize - i < sblock.fs_bsize ? 332 sblock.fs_cssize - i : sblock.fs_bsize; 333 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 334 if (bread(fsreadfd, (char *)sblock.fs_csp[j], 335 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 336 size) != 0 && !asked) { 337 pfatal("BAD SUMMARY INFORMATION"); 338 if (reply("CONTINUE") == 0) 339 errexit("%s", ""); 340 asked++; 341 } 342 } 343 /* 344 * allocate and initialize the necessary maps 345 */ 346 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 347 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 348 if (blockmap == NULL) { 349 printf("cannot alloc %u bytes for blockmap\n", 350 (unsigned)bmapsize); 351 goto badsblabel; 352 } 353 statemap = calloc((unsigned)(maxino + 1), sizeof(char)); 354 if (statemap == NULL) { 355 printf("cannot alloc %u bytes for statemap\n", 356 (unsigned)(maxino + 1)); 357 goto badsblabel; 358 } 359 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 360 if (typemap == NULL) { 361 printf("cannot alloc %u bytes for typemap\n", 362 (unsigned)(maxino + 1)); 363 goto badsblabel; 364 } 365 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 366 if (lncntp == NULL) { 367 printf("cannot alloc %u bytes for lncntp\n", 368 (unsigned)(maxino + 1) * sizeof(int16_t)); 369 goto badsblabel; 370 } 371 numdirs = sblock.fs_cstotal.cs_ndir; 372 inplast = 0; 373 listmax = numdirs + 10; 374 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 375 sizeof(struct inoinfo *)); 376 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 377 sizeof(struct inoinfo *)); 378 if (inpsort == NULL || inphead == NULL) { 379 printf("cannot alloc %u bytes for inphead\n", 380 (unsigned)numdirs * sizeof(struct inoinfo *)); 381 goto badsblabel; 382 } 383 bufinit(); 384 return (1); 385 386 badsblabel: 387 ckfini(0); 388 return (0); 389 } 390 391 /* 392 * Read in the super block and its summary info. 393 */ 394 static int 395 readsb(listerr) 396 int listerr; 397 { 398 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 399 400 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 401 return (0); 402 sblk.b_bno = super; 403 sblk.b_size = SBSIZE; 404 /* 405 * run a few consistency checks of the super block 406 */ 407 if (sblock.fs_magic != FS_MAGIC) 408 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 409 if (sblock.fs_ncg < 1) 410 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 411 if (sblock.fs_cpg < 1) 412 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 413 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 414 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 415 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 416 if (sblock.fs_sbsize > SBSIZE) 417 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 418 /* 419 * Compute block size that the filesystem is based on, 420 * according to fsbtodb, and adjust superblock block number 421 * so we can tell if this is an alternate later. 422 */ 423 super *= dev_bsize; 424 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 425 sblk.b_bno = super / dev_bsize; 426 if (bflag) { 427 havesb = 1; 428 return (1); 429 } 430 /* 431 * Set all possible fields that could differ, then do check 432 * of whole super block against an alternate super block. 433 * When an alternate super-block is specified this check is skipped. 434 */ 435 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 436 if (asblk.b_errs) 437 return (0); 438 altsblock.fs_firstfield = sblock.fs_firstfield; 439 altsblock.fs_fscktime = sblock.fs_fscktime; 440 altsblock.fs_time = sblock.fs_time; 441 altsblock.fs_cstotal = sblock.fs_cstotal; 442 altsblock.fs_cgrotor = sblock.fs_cgrotor; 443 altsblock.fs_fmod = sblock.fs_fmod; 444 altsblock.fs_clean = sblock.fs_clean; 445 altsblock.fs_ronly = sblock.fs_ronly; 446 altsblock.fs_flags = sblock.fs_flags; 447 altsblock.fs_maxcontig = sblock.fs_maxcontig; 448 altsblock.fs_minfree = sblock.fs_minfree; 449 altsblock.fs_optim = sblock.fs_optim; 450 altsblock.fs_rotdelay = sblock.fs_rotdelay; 451 altsblock.fs_maxbpg = sblock.fs_maxbpg; 452 memcpy(altsblock.fs_csp, sblock.fs_csp, 453 sizeof sblock.fs_csp); 454 altsblock.fs_maxcluster = sblock.fs_maxcluster; 455 memcpy(altsblock.fs_fsmnt, sblock.fs_fsmnt, 456 sizeof sblock.fs_fsmnt); 457 memcpy(altsblock.fs_sparecon, sblock.fs_sparecon, 458 sizeof sblock.fs_sparecon); 459 /* 460 * The following should not have to be copied. 461 */ 462 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 463 altsblock.fs_interleave = sblock.fs_interleave; 464 altsblock.fs_npsect = sblock.fs_npsect; 465 altsblock.fs_nrpos = sblock.fs_nrpos; 466 altsblock.fs_state = sblock.fs_state; 467 altsblock.fs_qbmask = sblock.fs_qbmask; 468 altsblock.fs_qfmask = sblock.fs_qfmask; 469 altsblock.fs_state = sblock.fs_state; 470 altsblock.fs_maxfilesize = sblock.fs_maxfilesize; 471 if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) { 472 if (debug) { 473 long *nlp, *olp, *endlp; 474 475 printf("superblock mismatches\n"); 476 nlp = (long *)&altsblock; 477 olp = (long *)&sblock; 478 endlp = olp + (sblock.fs_sbsize / sizeof *olp); 479 for ( ; olp < endlp; olp++, nlp++) { 480 if (*olp == *nlp) 481 continue; 482 printf("offset %d, original %ld, alternate %ld\n", 483 olp - (long *)&sblock, *olp, *nlp); 484 } 485 } 486 badsb(listerr, 487 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 488 return (0); 489 } 490 havesb = 1; 491 return (1); 492 } 493 494 void 495 badsb(listerr, s) 496 int listerr; 497 char *s; 498 { 499 500 if (!listerr) 501 return; 502 if (preen) 503 printf("%s: ", cdevname()); 504 pfatal("BAD SUPER BLOCK: %s\n", s); 505 } 506 507 /* 508 * Calculate a prototype superblock based on information in the disk label. 509 * When done the cgsblock macro can be calculated and the fs_ncg field 510 * can be used. Do NOT attempt to use other macros without verifying that 511 * their needed information is available! 512 */ 513 int 514 calcsb(dev, devfd, fs) 515 char *dev; 516 int devfd; 517 register struct fs *fs; 518 { 519 register struct disklabel *lp; 520 register struct partition *pp; 521 register char *cp; 522 int i; 523 524 cp = strchr(dev, '\0') - 1; 525 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 526 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 527 return (0); 528 } 529 lp = getdisklabel(dev, devfd); 530 if (isdigit(*cp)) 531 pp = &lp->d_partitions[0]; 532 else 533 pp = &lp->d_partitions[*cp - 'a']; 534 if (pp->p_fstype != FS_BSDFFS) { 535 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 536 dev, pp->p_fstype < FSMAXTYPES ? 537 fstypenames[pp->p_fstype] : "unknown"); 538 return (0); 539 } 540 memset(fs, 0, sizeof(struct fs)); 541 fs->fs_fsize = pp->p_fsize; 542 fs->fs_frag = pp->p_frag; 543 fs->fs_cpg = pp->p_cpg; 544 fs->fs_size = pp->p_size; 545 fs->fs_ntrak = lp->d_ntracks; 546 fs->fs_nsect = lp->d_nsectors; 547 fs->fs_spc = lp->d_secpercyl; 548 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 549 fs->fs_sblkno = roundup( 550 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 551 fs->fs_frag); 552 fs->fs_cgmask = 0xffffffff; 553 for (i = fs->fs_ntrak; i > 1; i >>= 1) 554 fs->fs_cgmask <<= 1; 555 if (!POWEROF2(fs->fs_ntrak)) 556 fs->fs_cgmask <<= 1; 557 fs->fs_cgoffset = roundup( 558 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 559 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 560 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 561 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 562 fs->fs_fsbtodb++; 563 dev_bsize = lp->d_secsize; 564 return (1); 565 } 566 567 static struct disklabel * 568 getdisklabel(s, fd) 569 char *s; 570 int fd; 571 { 572 static struct disklabel lab; 573 574 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 575 if (s == NULL) 576 return ((struct disklabel *)NULL); 577 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 578 errexit("%s: can't read disk label\n", s); 579 } 580 return (&lab); 581 } 582