setup.c revision 86514
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 86514 2001-11-17 23:48:21Z iedowse $"; 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 __P((int listerr, char *s)); 64static int calcsb __P((char *dev, int devfd, struct fs *fs)); 65static struct disklabel *getdisklabel __P((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(dev) 74 char *dev; 75{ 76 long cg, asked, i, j; 77 long bmapsize; 78 off_t sizepb; 79 struct stat statb; 80 struct fs proto; 81 size_t size; 82 83 havesb = 0; 84 fswritefd = -1; 85 cursnapshot = 0; 86 if (stat(dev, &statb) < 0) { 87 printf("Can't stat %s: %s\n", dev, strerror(errno)); 88 if (bkgrdflag) { 89 unlink(snapname); 90 bkgrdflag = 0; 91 } 92 return (0); 93 } 94 if ((statb.st_mode & S_IFMT) != S_IFCHR && 95 (statb.st_mode & S_IFMT) != S_IFBLK) { 96 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 97 unlink(snapname); 98 printf("background fsck lacks a snapshot\n"); 99 exit(EEXIT); 100 } 101 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 102 cursnapshot = statb.st_ino; 103 } else { 104 if (cvtlevel == 0 || 105 (statb.st_flags & SF_SNAPSHOT) == 0) { 106 if (preen && bkgrdflag) { 107 unlink(snapname); 108 bkgrdflag = 0; 109 } 110 pfatal("%s is not a disk device", dev); 111 if (reply("CONTINUE") == 0) { 112 if (bkgrdflag) { 113 unlink(snapname); 114 bkgrdflag = 0; 115 } 116 return (0); 117 } 118 } else { 119 if (bkgrdflag) { 120 unlink(snapname); 121 bkgrdflag = 0; 122 } 123 pfatal("cannot convert a snapshot"); 124 exit(EEXIT); 125 } 126 } 127 } 128 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 129 if (bkgrdflag) { 130 unlink(snapname); 131 bkgrdflag = 0; 132 } 133 printf("Can't open %s: %s\n", dev, strerror(errno)); 134 return (0); 135 } 136 if (bkgrdflag) { 137 unlink(snapname); 138 size = MIBSIZE; 139 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 140 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 141 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 142 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 143 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 144 pfatal("kernel lacks background fsck support\n"); 145 exit(EEXIT); 146 } 147 cmd.version = FFS_CMD_VERSION; 148 cmd.handle = fsreadfd; 149 fswritefd = -1; 150 } 151 if (preen == 0) 152 printf("** %s", dev); 153 if (bkgrdflag == 0 && 154 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 155 fswritefd = -1; 156 if (preen) 157 pfatal("NO WRITE ACCESS"); 158 printf(" (NO WRITE)"); 159 } 160 if (preen == 0) 161 printf("\n"); 162 /* 163 * Read in the superblock, looking for alternates if necessary 164 */ 165 if (readsb(1) == 0) { 166 skipclean = 0; 167 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 168 return(0); 169 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 170 return (0); 171 for (cg = 0; cg < proto.fs_ncg; cg++) { 172 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 173 if (readsb(0) != 0) 174 break; 175 } 176 if (cg >= proto.fs_ncg) { 177 printf("%s %s\n%s %s\n%s %s\n", 178 "SEARCH FOR ALTERNATE SUPER-BLOCK", 179 "FAILED. YOU MUST USE THE", 180 "-b OPTION TO FSCK TO SPECIFY THE", 181 "LOCATION OF AN ALTERNATE", 182 "SUPER-BLOCK TO SUPPLY NEEDED", 183 "INFORMATION; SEE fsck(8)."); 184 bflag = 0; 185 return(0); 186 } 187 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 188 bflag = 0; 189 } 190 if (skipclean && preen && sblock.fs_clean) { 191 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 192 return (-1); 193 } 194 maxfsblock = sblock.fs_size; 195 maxino = sblock.fs_ncg * sblock.fs_ipg; 196 /* 197 * Check and potentially fix certain fields in the super block. 198 */ 199 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 200 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 201 if (reply("SET TO DEFAULT") == 1) { 202 sblock.fs_optim = FS_OPTTIME; 203 sbdirty(); 204 } 205 } 206 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 207 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 208 sblock.fs_minfree); 209 if (reply("SET TO DEFAULT") == 1) { 210 sblock.fs_minfree = 10; 211 sbdirty(); 212 } 213 } 214 if (sblock.fs_interleave < 1 || 215 sblock.fs_interleave > sblock.fs_nsect) { 216 pfatal("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 217 sblock.fs_interleave); 218 sblock.fs_interleave = 1; 219 if (preen) 220 printf(" (FIXED)\n"); 221 if (preen || reply("SET TO DEFAULT") == 1) { 222 sbdirty(); 223 dirty(&asblk); 224 } 225 } 226 if (sblock.fs_npsect < sblock.fs_nsect || 227 sblock.fs_npsect > sblock.fs_nsect*2) { 228 pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 229 sblock.fs_npsect); 230 sblock.fs_npsect = sblock.fs_nsect; 231 if (preen) 232 printf(" (FIXED)\n"); 233 if (preen || reply("SET TO DEFAULT") == 1) { 234 sbdirty(); 235 dirty(&asblk); 236 } 237 } 238 if (sblock.fs_inodefmt >= FS_44INODEFMT) { 239 newinofmt = 1; 240 } else { 241 sblock.fs_qbmask = ~sblock.fs_bmask; 242 sblock.fs_qfmask = ~sblock.fs_fmask; 243 /* This should match the kernel limit in ffs_oldfscompat(). */ 244 sblock.fs_maxfilesize = (u_int64_t)1 << 39; 245 newinofmt = 0; 246 } 247 /* 248 * Convert to new inode format. 249 */ 250 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 251 if (preen) 252 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 253 else if (!reply("CONVERT TO NEW INODE FORMAT")) 254 return(0); 255 doinglevel2++; 256 sblock.fs_inodefmt = FS_44INODEFMT; 257 sizepb = sblock.fs_bsize; 258 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1; 259 for (i = 0; i < NIADDR; i++) { 260 sizepb *= NINDIR(&sblock); 261 sblock.fs_maxfilesize += sizepb; 262 } 263 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 264 sblock.fs_qbmask = ~sblock.fs_bmask; 265 sblock.fs_qfmask = ~sblock.fs_fmask; 266 sbdirty(); 267 dirty(&asblk); 268 } 269 /* 270 * Convert to new cylinder group format. 271 */ 272 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 273 if (preen) 274 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 275 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 276 return(0); 277 doinglevel1++; 278 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 279 sblock.fs_nrpos = 8; 280 sblock.fs_postbloff = 281 (char *)(&sblock.fs_opostbl[0][0]) - 282 (char *)(&sblock.fs_firstfield); 283 sblock.fs_rotbloff = &sblock.fs_space[0] - 284 (u_char *)(&sblock.fs_firstfield); 285 sblock.fs_cgsize = 286 fragroundup(&sblock, CGSIZE(&sblock)); 287 sbdirty(); 288 dirty(&asblk); 289 } 290 if (asblk.b_dirty && !bflag) { 291 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 292 flush(fswritefd, &asblk); 293 } 294 /* 295 * read in the summary info. 296 */ 297 asked = 0; 298 sblock.fs_csp = calloc(1, sblock.fs_cssize); 299 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 300 size = sblock.fs_cssize - i < sblock.fs_bsize ? 301 sblock.fs_cssize - i : sblock.fs_bsize; 302 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 303 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 304 size) != 0 && !asked) { 305 pfatal("BAD SUMMARY INFORMATION"); 306 if (reply("CONTINUE") == 0) { 307 ckfini(0); 308 exit(EEXIT); 309 } 310 asked++; 311 } 312 } 313 /* 314 * allocate and initialize the necessary maps 315 */ 316 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 317 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 318 if (blockmap == NULL) { 319 printf("cannot alloc %u bytes for blockmap\n", 320 (unsigned)bmapsize); 321 goto badsb; 322 } 323 inostathead = calloc((unsigned)(sblock.fs_ncg), 324 sizeof(struct inostatlist)); 325 if (inostathead == NULL) { 326 printf("cannot alloc %u bytes for inostathead\n", 327 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 328 goto badsb; 329 } 330 numdirs = sblock.fs_cstotal.cs_ndir; 331 dirhash = numdirs; 332 if (numdirs == 0) { 333 printf("numdirs is zero, try using an alternate superblock\n"); 334 goto badsb; 335 } 336 inplast = 0; 337 listmax = numdirs + 10; 338 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 339 sizeof(struct inoinfo *)); 340 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 341 sizeof(struct inoinfo *)); 342 if (inpsort == NULL || inphead == NULL) { 343 printf("cannot alloc %u bytes for inphead\n", 344 (unsigned)numdirs * sizeof(struct inoinfo *)); 345 goto badsb; 346 } 347 bufinit(); 348 if (sblock.fs_flags & FS_DOSOFTDEP) 349 usedsoftdep = 1; 350 else 351 usedsoftdep = 0; 352 return (1); 353 354badsb: 355 ckfini(0); 356 return (0); 357} 358 359/* 360 * Read in the super block and its summary info. 361 */ 362int 363readsb(listerr) 364 int listerr; 365{ 366 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 367 368 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 369 return (0); 370 sblk.b_bno = super; 371 sblk.b_size = SBSIZE; 372 /* 373 * run a few consistency checks of the super block 374 */ 375 if (sblock.fs_magic != FS_MAGIC) 376 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 377 if (sblock.fs_ncg < 1) 378 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 379 if (sblock.fs_cpg < 1) 380 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 381 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 382 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 383 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 384 if (sblock.fs_sbsize > SBSIZE) 385 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 386 /* 387 * Compute block size that the filesystem is based on, 388 * according to fsbtodb, and adjust superblock block number 389 * so we can tell if this is an alternate later. 390 */ 391 super *= dev_bsize; 392 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 393 sblk.b_bno = super / dev_bsize; 394 if (bflag) { 395 havesb = 1; 396 return (1); 397 } 398 /* 399 * Set all possible fields that could differ, then do check 400 * of whole super block against an alternate super block. 401 * When an alternate super-block is specified this check is skipped. 402 */ 403 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 404 if (asblk.b_errs) 405 return (0); 406 altsblock.fs_firstfield = sblock.fs_firstfield; 407 altsblock.fs_unused_1 = sblock.fs_unused_1; 408 altsblock.fs_time = sblock.fs_time; 409 altsblock.fs_cstotal = sblock.fs_cstotal; 410 altsblock.fs_cgrotor = sblock.fs_cgrotor; 411 altsblock.fs_fmod = sblock.fs_fmod; 412 altsblock.fs_clean = sblock.fs_clean; 413 altsblock.fs_ronly = sblock.fs_ronly; 414 altsblock.fs_flags = sblock.fs_flags; 415 altsblock.fs_maxcontig = sblock.fs_maxcontig; 416 altsblock.fs_minfree = sblock.fs_minfree; 417 altsblock.fs_optim = sblock.fs_optim; 418 altsblock.fs_rotdelay = sblock.fs_rotdelay; 419 altsblock.fs_maxbpg = sblock.fs_maxbpg; 420 memmove(altsblock.fs_ocsp, sblock.fs_ocsp, sizeof sblock.fs_ocsp); 421 altsblock.fs_csp = sblock.fs_csp; 422 altsblock.fs_maxcluster = sblock.fs_maxcluster; 423 altsblock.fs_contigdirs = sblock.fs_contigdirs; 424 altsblock.fs_avgfilesize = sblock.fs_avgfilesize; 425 altsblock.fs_avgfpdir = sblock.fs_avgfpdir; 426 altsblock.fs_pendingblocks = sblock.fs_pendingblocks; 427 altsblock.fs_pendinginodes = sblock.fs_pendinginodes; 428 memmove(altsblock.fs_fsmnt, sblock.fs_fsmnt, sizeof sblock.fs_fsmnt); 429 memmove(altsblock.fs_snapinum, sblock.fs_snapinum, 430 sizeof sblock.fs_snapinum); 431 memmove(altsblock.fs_sparecon, 432 sblock.fs_sparecon, sizeof sblock.fs_sparecon); 433 /* 434 * The following should not have to be copied. 435 */ 436 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 437 altsblock.fs_interleave = sblock.fs_interleave; 438 altsblock.fs_npsect = sblock.fs_npsect; 439 altsblock.fs_nrpos = sblock.fs_nrpos; 440 altsblock.fs_state = sblock.fs_state; 441 altsblock.fs_qbmask = sblock.fs_qbmask; 442 altsblock.fs_qfmask = sblock.fs_qfmask; 443 altsblock.fs_state = sblock.fs_state; 444 altsblock.fs_maxfilesize = sblock.fs_maxfilesize; 445 if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) { 446 if (debug) { 447 long *nlp, *olp, *endlp; 448 449 printf("superblock mismatches\n"); 450 nlp = (long *)&altsblock; 451 olp = (long *)&sblock; 452 endlp = olp + (sblock.fs_sbsize / sizeof *olp); 453 for ( ; olp < endlp; olp++, nlp++) { 454 if (*olp == *nlp) 455 continue; 456 printf( 457 "offset %d, original %ld, alternate %ld\n", 458 olp - (long *)&sblock, *olp, *nlp); 459 } 460 } 461 badsb(listerr, 462 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 463 return (0); 464 } 465 havesb = 1; 466 return (1); 467} 468 469static void 470badsb(listerr, s) 471 int listerr; 472 char *s; 473{ 474 475 if (!listerr) 476 return; 477 if (preen) 478 printf("%s: ", cdevname); 479 pfatal("BAD SUPER BLOCK: %s\n", s); 480} 481 482void 483sblock_init() 484{ 485 struct disklabel *lp; 486 487 fswritefd = -1; 488 fsmodified = 0; 489 lfdir = 0; 490 initbarea(&sblk); 491 initbarea(&asblk); 492 sblk.b_un.b_buf = malloc(SBSIZE); 493 asblk.b_un.b_buf = malloc(SBSIZE); 494 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 495 errx(EEXIT, "cannot allocate space for superblock"); 496 if ((lp = getdisklabel(NULL, fsreadfd))) 497 dev_bsize = secsize = lp->d_secsize; 498 else 499 dev_bsize = secsize = DEV_BSIZE; 500} 501 502/* 503 * Calculate a prototype superblock based on information in the disk label. 504 * When done the cgsblock macro can be calculated and the fs_ncg field 505 * can be used. Do NOT attempt to use other macros without verifying that 506 * their needed information is available! 507 */ 508static int 509calcsb(dev, devfd, fs) 510 char *dev; 511 int devfd; 512 register struct fs *fs; 513{ 514 register struct disklabel *lp; 515 register struct partition *pp; 516 register char *cp; 517 int i; 518 519 cp = strchr(dev, '\0') - 1; 520 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) { 521 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 522 return (0); 523 } 524 lp = getdisklabel(dev, devfd); 525 if (isdigit(*cp)) 526 pp = &lp->d_partitions[0]; 527 else 528 pp = &lp->d_partitions[*cp - 'a']; 529 if (pp->p_fstype != FS_BSDFFS) { 530 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 531 dev, pp->p_fstype < FSMAXTYPES ? 532 fstypenames[pp->p_fstype] : "unknown"); 533 return (0); 534 } 535 if (pp->p_fsize == 0 || pp->p_frag == 0 || 536 pp->p_cpg == 0 || pp->p_size == 0) { 537 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n", 538 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype], 539 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size); 540 return (0); 541 } 542 memset(fs, 0, sizeof(struct fs)); 543 fs->fs_fsize = pp->p_fsize; 544 fs->fs_frag = pp->p_frag; 545 fs->fs_cpg = pp->p_cpg; 546 fs->fs_size = pp->p_size; 547 fs->fs_ntrak = lp->d_ntracks; 548 fs->fs_nsect = lp->d_nsectors; 549 fs->fs_spc = lp->d_secpercyl; 550 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 551 fs->fs_sblkno = roundup( 552 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 553 fs->fs_frag); 554 fs->fs_cgmask = 0xffffffff; 555 for (i = fs->fs_ntrak; i > 1; i >>= 1) 556 fs->fs_cgmask <<= 1; 557 if (!POWEROF2(fs->fs_ntrak)) 558 fs->fs_cgmask <<= 1; 559 fs->fs_cgoffset = roundup( 560 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 561 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 562 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 563 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 564 fs->fs_fsbtodb++; 565 dev_bsize = lp->d_secsize; 566 return (1); 567} 568 569static struct disklabel * 570getdisklabel(s, fd) 571 char *s; 572 int fd; 573{ 574 static struct disklabel lab; 575 576 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 577 if (s == NULL) 578 return ((struct disklabel *)NULL); 579 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 580 errx(EEXIT, "%s: can't read disk label", s); 581 } 582 return (&lab); 583} 584