setup.c revision 75557
1/* 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35#if 0 36static const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; 37#endif 38static const char rcsid[] = 39 "$FreeBSD: head/sbin/fsck_ffs/setup.c 75557 2001-04-16 22:22:21Z mckusick $"; 40#endif /* not lint */ 41 42#define DKTYPENAMES 43#include <sys/param.h> 44#include <sys/stat.h> 45#include <sys/disklabel.h> 46#include <sys/file.h> 47 48#include <ufs/ufs/dinode.h> 49#include <ufs/ffs/fs.h> 50 51#include <ctype.h> 52#include <err.h> 53#include <errno.h> 54#include <string.h> 55 56#include "fsck.h" 57 58struct bufarea asblk; 59#define altsblock (*asblk.b_un.b_fs) 60#define POWEROF2(num) (((num) & ((num) - 1)) == 0) 61 62static void badsb __P((int listerr, char *s)); 63static int calcsb __P((char *dev, int devfd, struct fs *fs)); 64static struct disklabel *getdisklabel __P((char *s, int fd)); 65 66/* 67 * Read in a superblock finding an alternate if necessary. 68 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 69 * is already clean (preen mode only). 70 */ 71int 72setup(dev) 73 char *dev; 74{ 75 long cg, size, asked, i, j; 76 long bmapsize; 77 off_t sizepb; 78 struct stat statb; 79 struct fs proto; 80 81 havesb = 0; 82 fswritefd = -1; 83 cursnapshot = 0; 84 if (stat(dev, &statb) < 0) { 85 printf("Can't stat %s: %s\n", dev, strerror(errno)); 86 if (bkgrdflag) { 87 unlink(snapname); 88 bkgrdflag = 0; 89 } 90 return (0); 91 } 92 if ((statb.st_mode & S_IFMT) != S_IFCHR && 93 (statb.st_mode & S_IFMT) != S_IFBLK) { 94 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 95 unlink(snapname); 96 printf("background fsck lacks a snapshot\n"); 97 exit(EEXIT); 98 } 99 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 100 cursnapshot = statb.st_ino; 101 } else { 102 if (cvtlevel == 0 || 103 (statb.st_flags & SF_SNAPSHOT) == 0) { 104 if (preen && bkgrdflag) { 105 unlink(snapname); 106 bkgrdflag = 0; 107 } 108 pfatal("%s is not a disk device", dev); 109 if (reply("CONTINUE") == 0) { 110 if (bkgrdflag) { 111 unlink(snapname); 112 bkgrdflag = 0; 113 } 114 return (0); 115 } 116 } else { 117 if (bkgrdflag) { 118 unlink(snapname); 119 bkgrdflag = 0; 120 } 121 pfatal("cannot convert a snapshot"); 122 exit(EEXIT); 123 } 124 } 125 } 126 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 127 if (bkgrdflag) { 128 unlink(snapname); 129 bkgrdflag = 0; 130 } 131 printf("Can't open %s: %s\n", dev, strerror(errno)); 132 return (0); 133 } 134 if (bkgrdflag) { 135 unlink(snapname); 136 size = MIBSIZE; 137 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 138 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 139 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 140 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 141 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 142 pfatal("kernel lacks background fsck support\n"); 143 exit(EEXIT); 144 } 145 cmd.version = FFS_CMD_VERSION; 146 cmd.handle = fsreadfd; 147 fswritefd = -1; 148 } 149 if (preen == 0) 150 printf("** %s", dev); 151 if (bkgrdflag == 0 && 152 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 153 fswritefd = -1; 154 if (preen) 155 pfatal("NO WRITE ACCESS"); 156 printf(" (NO WRITE)"); 157 } 158 if (preen == 0) 159 printf("\n"); 160 /* 161 * Read in the superblock, looking for alternates if necessary 162 */ 163 if (readsb(1) == 0) { 164 skipclean = 0; 165 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 166 return(0); 167 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 168 return (0); 169 for (cg = 0; cg < proto.fs_ncg; cg++) { 170 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 171 if (readsb(0) != 0) 172 break; 173 } 174 if (cg >= proto.fs_ncg) { 175 printf("%s %s\n%s %s\n%s %s\n", 176 "SEARCH FOR ALTERNATE SUPER-BLOCK", 177 "FAILED. YOU MUST USE THE", 178 "-b OPTION TO FSCK TO SPECIFY THE", 179 "LOCATION OF AN ALTERNATE", 180 "SUPER-BLOCK TO SUPPLY NEEDED", 181 "INFORMATION; SEE fsck(8)."); 182 bflag = 0; 183 return(0); 184 } 185 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 186 bflag = 0; 187 } 188 if (skipclean && preen && sblock.fs_clean) { 189 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 190 return (-1); 191 } 192 maxfsblock = sblock.fs_size; 193 maxino = sblock.fs_ncg * sblock.fs_ipg; 194 /* 195 * Check and potentially fix certain fields in the super block. 196 */ 197 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 198 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 199 if (reply("SET TO DEFAULT") == 1) { 200 sblock.fs_optim = FS_OPTTIME; 201 sbdirty(); 202 } 203 } 204 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 205 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 206 sblock.fs_minfree); 207 if (reply("SET TO DEFAULT") == 1) { 208 sblock.fs_minfree = 10; 209 sbdirty(); 210 } 211 } 212 if (sblock.fs_interleave < 1 || 213 sblock.fs_interleave > sblock.fs_nsect) { 214 pfatal("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 215 sblock.fs_interleave); 216 sblock.fs_interleave = 1; 217 if (preen) 218 printf(" (FIXED)\n"); 219 if (preen || reply("SET TO DEFAULT") == 1) { 220 sbdirty(); 221 dirty(&asblk); 222 } 223 } 224 if (sblock.fs_npsect < sblock.fs_nsect || 225 sblock.fs_npsect > sblock.fs_nsect*2) { 226 pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 227 sblock.fs_npsect); 228 sblock.fs_npsect = sblock.fs_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_inodefmt >= FS_44INODEFMT) { 237 newinofmt = 1; 238 } else { 239 sblock.fs_qbmask = ~sblock.fs_bmask; 240 sblock.fs_qfmask = ~sblock.fs_fmask; 241 /* This should match the kernel limit in ffs_oldfscompat(). */ 242 sblock.fs_maxfilesize = (u_int64_t)1 << 39; 243 newinofmt = 0; 244 } 245 /* 246 * Convert to new inode format. 247 */ 248 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 249 if (preen) 250 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 251 else if (!reply("CONVERT TO NEW INODE FORMAT")) 252 return(0); 253 doinglevel2++; 254 sblock.fs_inodefmt = FS_44INODEFMT; 255 sizepb = sblock.fs_bsize; 256 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1; 257 for (i = 0; i < NIADDR; i++) { 258 sizepb *= NINDIR(&sblock); 259 sblock.fs_maxfilesize += sizepb; 260 } 261 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 262 sblock.fs_qbmask = ~sblock.fs_bmask; 263 sblock.fs_qfmask = ~sblock.fs_fmask; 264 sbdirty(); 265 dirty(&asblk); 266 } 267 /* 268 * Convert to new cylinder group format. 269 */ 270 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 271 if (preen) 272 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 273 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 274 return(0); 275 doinglevel1++; 276 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 277 sblock.fs_nrpos = 8; 278 sblock.fs_postbloff = 279 (char *)(&sblock.fs_opostbl[0][0]) - 280 (char *)(&sblock.fs_firstfield); 281 sblock.fs_rotbloff = &sblock.fs_space[0] - 282 (u_char *)(&sblock.fs_firstfield); 283 sblock.fs_cgsize = 284 fragroundup(&sblock, CGSIZE(&sblock)); 285 sbdirty(); 286 dirty(&asblk); 287 } 288 if (asblk.b_dirty && !bflag) { 289 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 290 flush(fswritefd, &asblk); 291 } 292 /* 293 * read in the summary info. 294 */ 295 asked = 0; 296 sblock.fs_csp = calloc(1, sblock.fs_cssize); 297 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 298 size = sblock.fs_cssize - i < sblock.fs_bsize ? 299 sblock.fs_cssize - i : sblock.fs_bsize; 300 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 301 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 302 size) != 0 && !asked) { 303 pfatal("BAD SUMMARY INFORMATION"); 304 if (reply("CONTINUE") == 0) { 305 ckfini(0); 306 exit(EEXIT); 307 } 308 asked++; 309 } 310 } 311 /* 312 * allocate and initialize the necessary maps 313 */ 314 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 315 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 316 if (blockmap == NULL) { 317 printf("cannot alloc %u bytes for blockmap\n", 318 (unsigned)bmapsize); 319 goto badsb; 320 } 321 inostathead = calloc((unsigned)(sblock.fs_ncg), 322 sizeof(struct inostatlist)); 323 if (inostathead == NULL) { 324 printf("cannot alloc %u bytes for inostathead\n", 325 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 326 goto badsb; 327 } 328 numdirs = sblock.fs_cstotal.cs_ndir; 329 dirhash = numdirs; 330 if (numdirs == 0) { 331 printf("numdirs is zero, try using an alternate superblock\n"); 332 goto badsb; 333 } 334 inplast = 0; 335 listmax = numdirs + 10; 336 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 337 sizeof(struct inoinfo *)); 338 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 339 sizeof(struct inoinfo *)); 340 if (inpsort == NULL || inphead == NULL) { 341 printf("cannot alloc %u bytes for inphead\n", 342 (unsigned)numdirs * sizeof(struct inoinfo *)); 343 goto badsb; 344 } 345 bufinit(); 346 if (sblock.fs_flags & FS_DOSOFTDEP) 347 usedsoftdep = 1; 348 else 349 usedsoftdep = 0; 350 return (1); 351 352badsb: 353 ckfini(0); 354 return (0); 355} 356 357/* 358 * Read in the super block and its summary info. 359 */ 360int 361readsb(listerr) 362 int listerr; 363{ 364 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 365 366 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 367 return (0); 368 sblk.b_bno = super; 369 sblk.b_size = SBSIZE; 370 /* 371 * run a few consistency checks of the super block 372 */ 373 if (sblock.fs_magic != FS_MAGIC) 374 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 375 if (sblock.fs_ncg < 1) 376 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 377 if (sblock.fs_cpg < 1) 378 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 379 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 380 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 381 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 382 if (sblock.fs_sbsize > SBSIZE) 383 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 384 /* 385 * Compute block size that the filesystem is based on, 386 * according to fsbtodb, and adjust superblock block number 387 * so we can tell if this is an alternate later. 388 */ 389 super *= dev_bsize; 390 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 391 sblk.b_bno = super / dev_bsize; 392 if (bflag) { 393 havesb = 1; 394 return (1); 395 } 396 /* 397 * Set all possible fields that could differ, then do check 398 * of whole super block against an alternate super block. 399 * When an alternate super-block is specified this check is skipped. 400 */ 401 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 402 if (asblk.b_errs) 403 return (0); 404 altsblock.fs_firstfield = sblock.fs_firstfield; 405 altsblock.fs_unused_1 = sblock.fs_unused_1; 406 altsblock.fs_time = sblock.fs_time; 407 altsblock.fs_cstotal = sblock.fs_cstotal; 408 altsblock.fs_cgrotor = sblock.fs_cgrotor; 409 altsblock.fs_fmod = sblock.fs_fmod; 410 altsblock.fs_clean = sblock.fs_clean; 411 altsblock.fs_ronly = sblock.fs_ronly; 412 altsblock.fs_flags = sblock.fs_flags; 413 altsblock.fs_maxcontig = sblock.fs_maxcontig; 414 altsblock.fs_minfree = sblock.fs_minfree; 415 altsblock.fs_optim = sblock.fs_optim; 416 altsblock.fs_rotdelay = sblock.fs_rotdelay; 417 altsblock.fs_maxbpg = sblock.fs_maxbpg; 418 memmove(altsblock.fs_ocsp, sblock.fs_ocsp, sizeof sblock.fs_ocsp); 419 altsblock.fs_csp = sblock.fs_csp; 420 altsblock.fs_maxcluster = sblock.fs_maxcluster; 421 altsblock.fs_contigdirs = sblock.fs_contigdirs; 422 altsblock.fs_avgfilesize = sblock.fs_avgfilesize; 423 altsblock.fs_avgfpdir = sblock.fs_avgfpdir; 424 memmove(altsblock.fs_fsmnt, sblock.fs_fsmnt, sizeof sblock.fs_fsmnt); 425 memmove(altsblock.fs_snapinum, sblock.fs_snapinum, 426 sizeof sblock.fs_snapinum); 427 memmove(altsblock.fs_sparecon, 428 sblock.fs_sparecon, sizeof sblock.fs_sparecon); 429 /* 430 * The following should not have to be copied. 431 */ 432 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 433 altsblock.fs_interleave = sblock.fs_interleave; 434 altsblock.fs_npsect = sblock.fs_npsect; 435 altsblock.fs_nrpos = sblock.fs_nrpos; 436 altsblock.fs_state = sblock.fs_state; 437 altsblock.fs_qbmask = sblock.fs_qbmask; 438 altsblock.fs_qfmask = sblock.fs_qfmask; 439 altsblock.fs_state = sblock.fs_state; 440 altsblock.fs_maxfilesize = sblock.fs_maxfilesize; 441 if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) { 442 if (debug) { 443 long *nlp, *olp, *endlp; 444 445 printf("superblock mismatches\n"); 446 nlp = (long *)&altsblock; 447 olp = (long *)&sblock; 448 endlp = olp + (sblock.fs_sbsize / sizeof *olp); 449 for ( ; olp < endlp; olp++, nlp++) { 450 if (*olp == *nlp) 451 continue; 452 printf( 453 "offset %d, original %ld, alternate %ld\n", 454 olp - (long *)&sblock, *olp, *nlp); 455 } 456 } 457 badsb(listerr, 458 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 459 return (0); 460 } 461 havesb = 1; 462 return (1); 463} 464 465static void 466badsb(listerr, s) 467 int listerr; 468 char *s; 469{ 470 471 if (!listerr) 472 return; 473 if (preen) 474 printf("%s: ", cdevname); 475 pfatal("BAD SUPER BLOCK: %s\n", s); 476} 477 478sblock_init() 479{ 480 struct disklabel *lp; 481 482 fswritefd = -1; 483 fsmodified = 0; 484 lfdir = 0; 485 initbarea(&sblk); 486 initbarea(&asblk); 487 sblk.b_un.b_buf = malloc(SBSIZE); 488 asblk.b_un.b_buf = malloc(SBSIZE); 489 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 490 errx(EEXIT, "cannot allocate space for superblock"); 491 if ((lp = getdisklabel(NULL, fsreadfd))) 492 dev_bsize = secsize = lp->d_secsize; 493 else 494 dev_bsize = secsize = DEV_BSIZE; 495} 496 497/* 498 * Calculate a prototype superblock based on information in the disk label. 499 * When done the cgsblock macro can be calculated and the fs_ncg field 500 * can be used. Do NOT attempt to use other macros without verifying that 501 * their needed information is available! 502 */ 503static int 504calcsb(dev, devfd, fs) 505 char *dev; 506 int devfd; 507 register struct fs *fs; 508{ 509 register struct disklabel *lp; 510 register struct partition *pp; 511 register char *cp; 512 int i; 513 514 cp = strchr(dev, '\0') - 1; 515 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) { 516 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 517 return (0); 518 } 519 lp = getdisklabel(dev, devfd); 520 if (isdigit(*cp)) 521 pp = &lp->d_partitions[0]; 522 else 523 pp = &lp->d_partitions[*cp - 'a']; 524 if (pp->p_fstype != FS_BSDFFS) { 525 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 526 dev, pp->p_fstype < FSMAXTYPES ? 527 fstypenames[pp->p_fstype] : "unknown"); 528 return (0); 529 } 530 if (pp->p_fsize == 0 || pp->p_frag == 0 || 531 pp->p_cpg == 0 || pp->p_size == 0) { 532 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n", 533 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype], 534 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size); 535 return (0); 536 } 537 memset(fs, 0, sizeof(struct fs)); 538 fs->fs_fsize = pp->p_fsize; 539 fs->fs_frag = pp->p_frag; 540 fs->fs_cpg = pp->p_cpg; 541 fs->fs_size = pp->p_size; 542 fs->fs_ntrak = lp->d_ntracks; 543 fs->fs_nsect = lp->d_nsectors; 544 fs->fs_spc = lp->d_secpercyl; 545 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 546 fs->fs_sblkno = roundup( 547 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 548 fs->fs_frag); 549 fs->fs_cgmask = 0xffffffff; 550 for (i = fs->fs_ntrak; i > 1; i >>= 1) 551 fs->fs_cgmask <<= 1; 552 if (!POWEROF2(fs->fs_ntrak)) 553 fs->fs_cgmask <<= 1; 554 fs->fs_cgoffset = roundup( 555 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 556 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 557 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 558 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 559 fs->fs_fsbtodb++; 560 dev_bsize = lp->d_secsize; 561 return (1); 562} 563 564static struct disklabel * 565getdisklabel(s, fd) 566 char *s; 567 int fd; 568{ 569 static struct disklabel lab; 570 571 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 572 if (s == NULL) 573 return ((struct disklabel *)NULL); 574 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 575 errx(EEXIT, "%s: can't read disk label", s); 576 } 577 return (&lab); 578} 579