setup.c revision 92839
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 92839 2002-03-20 22:57:10Z imp $"; 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#include <sys/sysctl.h> 48 49#include <ufs/ufs/dinode.h> 50#include <ufs/ffs/fs.h> 51 52#include <ctype.h> 53#include <err.h> 54#include <errno.h> 55#include <string.h> 56 57#include "fsck.h" 58 59struct bufarea asblk; 60#define altsblock (*asblk.b_un.b_fs) 61#define POWEROF2(num) (((num) & ((num) - 1)) == 0) 62 63static void badsb(int listerr, char *s); 64static int calcsb(char *dev, int devfd, struct fs *fs); 65static struct disklabel *getdisklabel(char *s, int fd); 66 67/* 68 * Read in a superblock finding an alternate if necessary. 69 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 70 * is already clean (preen mode only). 71 */ 72int 73setup(char *dev) 74{ 75 long cg, asked, i, j; 76 long bmapsize; 77 off_t sizepb; 78 struct stat statb; 79 struct fs proto; 80 size_t size; 81 82 havesb = 0; 83 fswritefd = -1; 84 cursnapshot = 0; 85 if (stat(dev, &statb) < 0) { 86 printf("Can't stat %s: %s\n", dev, strerror(errno)); 87 if (bkgrdflag) { 88 unlink(snapname); 89 bkgrdflag = 0; 90 } 91 return (0); 92 } 93 if ((statb.st_mode & S_IFMT) != S_IFCHR && 94 (statb.st_mode & S_IFMT) != S_IFBLK) { 95 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 96 unlink(snapname); 97 printf("background fsck lacks a snapshot\n"); 98 exit(EEXIT); 99 } 100 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 101 cursnapshot = statb.st_ino; 102 } else { 103 if (cvtlevel == 0 || 104 (statb.st_flags & SF_SNAPSHOT) == 0) { 105 if (preen && bkgrdflag) { 106 unlink(snapname); 107 bkgrdflag = 0; 108 } 109 pfatal("%s is not a disk device", dev); 110 if (reply("CONTINUE") == 0) { 111 if (bkgrdflag) { 112 unlink(snapname); 113 bkgrdflag = 0; 114 } 115 return (0); 116 } 117 } else { 118 if (bkgrdflag) { 119 unlink(snapname); 120 bkgrdflag = 0; 121 } 122 pfatal("cannot convert a snapshot"); 123 exit(EEXIT); 124 } 125 } 126 } 127 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 128 if (bkgrdflag) { 129 unlink(snapname); 130 bkgrdflag = 0; 131 } 132 printf("Can't open %s: %s\n", dev, strerror(errno)); 133 return (0); 134 } 135 if (bkgrdflag) { 136 unlink(snapname); 137 size = MIBSIZE; 138 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 139 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 140 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 141 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 142 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 143 pfatal("kernel lacks background fsck support\n"); 144 exit(EEXIT); 145 } 146 cmd.version = FFS_CMD_VERSION; 147 cmd.handle = fsreadfd; 148 fswritefd = -1; 149 } 150 if (preen == 0) 151 printf("** %s", dev); 152 if (bkgrdflag == 0 && 153 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 154 fswritefd = -1; 155 if (preen) 156 pfatal("NO WRITE ACCESS"); 157 printf(" (NO WRITE)"); 158 } 159 if (preen == 0) 160 printf("\n"); 161 /* 162 * Read in the superblock, looking for alternates if necessary 163 */ 164 if (readsb(1) == 0) { 165 skipclean = 0; 166 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 167 return(0); 168 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 169 return (0); 170 for (cg = 0; cg < proto.fs_ncg; cg++) { 171 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 172 if (readsb(0) != 0) 173 break; 174 } 175 if (cg >= proto.fs_ncg) { 176 printf("%s %s\n%s %s\n%s %s\n", 177 "SEARCH FOR ALTERNATE SUPER-BLOCK", 178 "FAILED. YOU MUST USE THE", 179 "-b OPTION TO FSCK TO SPECIFY THE", 180 "LOCATION OF AN ALTERNATE", 181 "SUPER-BLOCK TO SUPPLY NEEDED", 182 "INFORMATION; SEE fsck(8)."); 183 bflag = 0; 184 return(0); 185 } 186 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 187 bflag = 0; 188 } 189 if (skipclean && preen && sblock.fs_clean) { 190 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 191 return (-1); 192 } 193 maxfsblock = sblock.fs_size; 194 maxino = sblock.fs_ncg * sblock.fs_ipg; 195 /* 196 * Check and potentially fix certain fields in the super block. 197 */ 198 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 199 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 200 if (reply("SET TO DEFAULT") == 1) { 201 sblock.fs_optim = FS_OPTTIME; 202 sbdirty(); 203 } 204 } 205 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 206 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 207 sblock.fs_minfree); 208 if (reply("SET TO DEFAULT") == 1) { 209 sblock.fs_minfree = 10; 210 sbdirty(); 211 } 212 } 213 if (sblock.fs_interleave < 1 || 214 sblock.fs_interleave > sblock.fs_nsect) { 215 pfatal("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 216 sblock.fs_interleave); 217 sblock.fs_interleave = 1; 218 if (preen) 219 printf(" (FIXED)\n"); 220 if (preen || reply("SET TO DEFAULT") == 1) { 221 sbdirty(); 222 dirty(&asblk); 223 } 224 } 225 if (sblock.fs_npsect < sblock.fs_nsect || 226 sblock.fs_npsect > sblock.fs_nsect*2) { 227 pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 228 sblock.fs_npsect); 229 sblock.fs_npsect = sblock.fs_nsect; 230 if (preen) 231 printf(" (FIXED)\n"); 232 if (preen || reply("SET TO DEFAULT") == 1) { 233 sbdirty(); 234 dirty(&asblk); 235 } 236 } 237 if (sblock.fs_inodefmt >= FS_44INODEFMT) { 238 newinofmt = 1; 239 } else { 240 sblock.fs_qbmask = ~sblock.fs_bmask; 241 sblock.fs_qfmask = ~sblock.fs_fmask; 242 /* This should match the kernel limit in ffs_oldfscompat(). */ 243 sblock.fs_maxfilesize = (u_int64_t)1 << 39; 244 newinofmt = 0; 245 } 246 /* 247 * Convert to new inode format. 248 */ 249 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 250 if (preen) 251 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 252 else if (!reply("CONVERT TO NEW INODE FORMAT")) 253 return(0); 254 doinglevel2++; 255 sblock.fs_inodefmt = FS_44INODEFMT; 256 sizepb = sblock.fs_bsize; 257 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1; 258 for (i = 0; i < NIADDR; i++) { 259 sizepb *= NINDIR(&sblock); 260 sblock.fs_maxfilesize += sizepb; 261 } 262 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 263 sblock.fs_qbmask = ~sblock.fs_bmask; 264 sblock.fs_qfmask = ~sblock.fs_fmask; 265 sbdirty(); 266 dirty(&asblk); 267 } 268 /* 269 * Convert to new cylinder group format. 270 */ 271 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 272 if (preen) 273 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 274 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 275 return(0); 276 doinglevel1++; 277 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 278 sblock.fs_nrpos = 8; 279 sblock.fs_postbloff = 280 (char *)(&sblock.fs_opostbl[0][0]) - 281 (char *)(&sblock.fs_firstfield); 282 sblock.fs_rotbloff = &sblock.fs_space[0] - 283 (u_char *)(&sblock.fs_firstfield); 284 sblock.fs_cgsize = 285 fragroundup(&sblock, CGSIZE(&sblock)); 286 sbdirty(); 287 dirty(&asblk); 288 } 289 if (asblk.b_dirty && !bflag) { 290 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 291 flush(fswritefd, &asblk); 292 } 293 /* 294 * read in the summary info. 295 */ 296 asked = 0; 297 sblock.fs_csp = calloc(1, sblock.fs_cssize); 298 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 299 size = sblock.fs_cssize - i < sblock.fs_bsize ? 300 sblock.fs_cssize - i : sblock.fs_bsize; 301 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 302 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 303 size) != 0 && !asked) { 304 pfatal("BAD SUMMARY INFORMATION"); 305 if (reply("CONTINUE") == 0) { 306 ckfini(0); 307 exit(EEXIT); 308 } 309 asked++; 310 } 311 } 312 /* 313 * allocate and initialize the necessary maps 314 */ 315 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 316 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 317 if (blockmap == NULL) { 318 printf("cannot alloc %u bytes for blockmap\n", 319 (unsigned)bmapsize); 320 goto badsb; 321 } 322 inostathead = calloc((unsigned)(sblock.fs_ncg), 323 sizeof(struct inostatlist)); 324 if (inostathead == NULL) { 325 printf("cannot alloc %u bytes for inostathead\n", 326 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 327 goto badsb; 328 } 329 numdirs = sblock.fs_cstotal.cs_ndir; 330 dirhash = numdirs; 331 if (numdirs == 0) { 332 printf("numdirs is zero, try using an alternate superblock\n"); 333 goto badsb; 334 } 335 inplast = 0; 336 listmax = numdirs + 10; 337 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 338 sizeof(struct inoinfo *)); 339 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 340 sizeof(struct inoinfo *)); 341 if (inpsort == NULL || inphead == NULL) { 342 printf("cannot alloc %u bytes for inphead\n", 343 (unsigned)numdirs * sizeof(struct inoinfo *)); 344 goto badsb; 345 } 346 bufinit(); 347 if (sblock.fs_flags & FS_DOSOFTDEP) 348 usedsoftdep = 1; 349 else 350 usedsoftdep = 0; 351 return (1); 352 353badsb: 354 ckfini(0); 355 return (0); 356} 357 358/* 359 * Read in the super block and its summary info. 360 */ 361int 362readsb(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_active = sblock.fs_active; 423 altsblock.fs_avgfilesize = sblock.fs_avgfilesize; 424 altsblock.fs_avgfpdir = sblock.fs_avgfpdir; 425 altsblock.fs_pendingblocks = sblock.fs_pendingblocks; 426 altsblock.fs_pendinginodes = sblock.fs_pendinginodes; 427 memmove(altsblock.fs_fsmnt, sblock.fs_fsmnt, sizeof sblock.fs_fsmnt); 428 memmove(altsblock.fs_snapinum, sblock.fs_snapinum, 429 sizeof sblock.fs_snapinum); 430 memmove(altsblock.fs_sparecon, 431 sblock.fs_sparecon, sizeof sblock.fs_sparecon); 432 /* 433 * The following should not have to be copied. 434 */ 435 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 436 altsblock.fs_interleave = sblock.fs_interleave; 437 altsblock.fs_npsect = sblock.fs_npsect; 438 altsblock.fs_nrpos = sblock.fs_nrpos; 439 altsblock.fs_state = sblock.fs_state; 440 altsblock.fs_qbmask = sblock.fs_qbmask; 441 altsblock.fs_qfmask = sblock.fs_qfmask; 442 altsblock.fs_state = sblock.fs_state; 443 altsblock.fs_maxfilesize = sblock.fs_maxfilesize; 444 if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) { 445 if (debug) { 446 long *nlp, *olp, *endlp; 447 448 printf("superblock mismatches\n"); 449 nlp = (long *)&altsblock; 450 olp = (long *)&sblock; 451 endlp = olp + (sblock.fs_sbsize / sizeof *olp); 452 for ( ; olp < endlp; olp++, nlp++) { 453 if (*olp == *nlp) 454 continue; 455 printf( 456 "offset %d, original %ld, alternate %ld\n", 457 olp - (long *)&sblock, *olp, *nlp); 458 } 459 } 460 badsb(listerr, 461 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 462 return (0); 463 } 464 havesb = 1; 465 return (1); 466} 467 468static void 469badsb(int listerr, char *s) 470{ 471 472 if (!listerr) 473 return; 474 if (preen) 475 printf("%s: ", cdevname); 476 pfatal("BAD SUPER BLOCK: %s\n", s); 477} 478 479void 480sblock_init(void) 481{ 482 struct disklabel *lp; 483 484 fswritefd = -1; 485 fsmodified = 0; 486 lfdir = 0; 487 initbarea(&sblk); 488 initbarea(&asblk); 489 sblk.b_un.b_buf = malloc(SBSIZE); 490 asblk.b_un.b_buf = malloc(SBSIZE); 491 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 492 errx(EEXIT, "cannot allocate space for superblock"); 493 if ((lp = getdisklabel(NULL, fsreadfd))) 494 dev_bsize = secsize = lp->d_secsize; 495 else 496 dev_bsize = secsize = DEV_BSIZE; 497} 498 499/* 500 * Calculate a prototype superblock based on information in the disk label. 501 * When done the cgsblock macro can be calculated and the fs_ncg field 502 * can be used. Do NOT attempt to use other macros without verifying that 503 * their needed information is available! 504 */ 505static int 506calcsb(char *dev, int devfd, struct fs *fs) 507{ 508 struct disklabel *lp; 509 struct partition *pp; 510 char *cp; 511 int i; 512 513 cp = strchr(dev, '\0') - 1; 514 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) { 515 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 516 return (0); 517 } 518 lp = getdisklabel(dev, devfd); 519 if (isdigit(*cp)) 520 pp = &lp->d_partitions[0]; 521 else 522 pp = &lp->d_partitions[*cp - 'a']; 523 if (pp->p_fstype != FS_BSDFFS) { 524 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 525 dev, pp->p_fstype < FSMAXTYPES ? 526 fstypenames[pp->p_fstype] : "unknown"); 527 return (0); 528 } 529 if (pp->p_fsize == 0 || pp->p_frag == 0 || 530 pp->p_cpg == 0 || pp->p_size == 0) { 531 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n", 532 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype], 533 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size); 534 return (0); 535 } 536 memset(fs, 0, sizeof(struct fs)); 537 fs->fs_fsize = pp->p_fsize; 538 fs->fs_frag = pp->p_frag; 539 fs->fs_cpg = pp->p_cpg; 540 fs->fs_size = pp->p_size; 541 fs->fs_ntrak = lp->d_ntracks; 542 fs->fs_nsect = lp->d_nsectors; 543 fs->fs_spc = lp->d_secpercyl; 544 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 545 fs->fs_sblkno = roundup( 546 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 547 fs->fs_frag); 548 fs->fs_cgmask = 0xffffffff; 549 for (i = fs->fs_ntrak; i > 1; i >>= 1) 550 fs->fs_cgmask <<= 1; 551 if (!POWEROF2(fs->fs_ntrak)) 552 fs->fs_cgmask <<= 1; 553 fs->fs_cgoffset = roundup( 554 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 555 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 556 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 557 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 558 fs->fs_fsbtodb++; 559 dev_bsize = lp->d_secsize; 560 return (1); 561} 562 563static struct disklabel * 564getdisklabel(char *s, int fd) 565{ 566 static struct disklabel lab; 567 568 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 569 if (s == NULL) 570 return ((struct disklabel *)NULL); 571 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 572 errx(EEXIT, "%s: can't read disk label", s); 573 } 574 return (&lab); 575} 576