1 /* $NetBSD: setup.c,v 1.14 2003/10/05 17:48:49 bouyer 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1997 Manuel Bouyer. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. All advertising materials mentioning features or use of this software 44 * must display the following acknowledgement: 45 * This product includes software developed by Manuel Bouyer. 46 * 4. The name of the author may not be used to endorse or promote products 47 * derived from this software without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62 #include <sys/cdefs.h> 63 #ifndef lint 64 #if 0 65 static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94"; 66 #else 67 __RCSID("$NetBSD: setup.c,v 1.14 2003/10/05 17:48:49 bouyer Exp $"); 68 #endif 69 #endif /* not lint */ 70 71 #define FSTYPENAMES 72 #include <sys/param.h> 73 #include <sys/time.h> 74 #include <ufs/ext2fs/ext2fs_dinode.h> 75 #include <ufs/ext2fs/ext2fs.h> 76 #include <sys/stat.h> 77 #include <sys/ioctl.h> 78 #include <sys/disklabel.h> 79 #include <sys/file.h> 80 81 #include <errno.h> 82 #include <stdio.h> 83 #include <stdlib.h> 84 #include <string.h> 85 #include <ctype.h> 86 87 #include "fsck.h" 88 #include "extern.h" 89 #include "fsutil.h" 90 91 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 92 93 void badsb __P((int, char *)); 94 int calcsb __P((const char *, int, struct m_ext2fs *)); 95 static struct disklabel *getdisklabel __P((const char *, int)); 96 static int readsb __P((int)); 97 98 int 99 setup(dev) 100 const char *dev; 101 { 102 long cg, asked, i; 103 long bmapsize; 104 struct disklabel *lp; 105 off_t sizepb; 106 struct stat statb; 107 struct m_ext2fs proto; 108 int doskipclean; 109 u_int64_t maxfilesize; 110 111 havesb = 0; 112 fswritefd = -1; 113 doskipclean = skipclean; 114 if (stat(dev, &statb) < 0) { 115 printf("Can't stat %s: %s\n", dev, strerror(errno)); 116 return (0); 117 } 118 if (!S_ISCHR(statb.st_mode)) { 119 pfatal("%s is not a character device", dev); 120 if (reply("CONTINUE") == 0) 121 return (0); 122 } 123 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 124 printf("Can't open %s: %s\n", dev, strerror(errno)); 125 return (0); 126 } 127 if (preen == 0) 128 printf("** %s", dev); 129 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 130 fswritefd = -1; 131 if (preen) 132 pfatal("NO WRITE ACCESS"); 133 printf(" (NO WRITE)"); 134 } 135 if (preen == 0) 136 printf("\n"); 137 fsmodified = 0; 138 lfdir = 0; 139 initbarea(&sblk); 140 initbarea(&asblk); 141 sblk.b_un.b_buf = malloc(SBSIZE); 142 asblk.b_un.b_buf = malloc(SBSIZE); 143 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 144 errexit("cannot allocate space for superblock\n"); 145 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 146 dev_bsize = secsize = lp->d_secsize; 147 else 148 dev_bsize = secsize = DEV_BSIZE; 149 /* 150 * Read in the superblock, looking for alternates if necessary 151 */ 152 if (readsb(1) == 0) { 153 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 154 return(0); 155 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 156 return (0); 157 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 158 bflag = fsbtodb(&proto, 159 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); 160 if (readsb(0) != 0) 161 break; 162 } 163 if (cg >= proto.e2fs_ncg) { 164 printf("%s %s\n%s %s\n%s %s\n", 165 "SEARCH FOR ALTERNATE SUPER-BLOCK", 166 "FAILED. YOU MUST USE THE", 167 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 168 "LOCATION OF AN ALTERNATE", 169 "SUPER-BLOCK TO SUPPLY NEEDED", 170 "INFORMATION; SEE fsck_ext2fs(8)."); 171 return(0); 172 } 173 doskipclean = 0; 174 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 175 } 176 if (debug) 177 printf("state = %d\n", sblock.e2fs.e2fs_state); 178 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 179 if (doskipclean) { 180 pwarn("%sile system is clean; not checking\n", 181 preen ? "f" : "** F"); 182 return (-1); 183 } 184 if (!preen) 185 pwarn("** File system is already clean\n"); 186 } 187 maxfsblock = sblock.e2fs.e2fs_bcount; 188 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 189 sizepb = sblock.e2fs_bsize; 190 maxfilesize = sblock.e2fs_bsize * NDADDR - 1; 191 for (i = 0; i < NIADDR; i++) { 192 sizepb *= NINDIR(&sblock); 193 maxfilesize += sizepb; 194 } 195 /* 196 * Check and potentially fix certain fields in the super block. 197 */ 198 if ((sblock.e2fs.e2fs_rbcount < 0) || 199 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 200 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 201 sblock.e2fs.e2fs_rbcount); 202 if (reply("SET TO DEFAULT") == 1) { 203 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; 204 sbdirty(); 205 dirty(&asblk); 206 } 207 } 208 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 209 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 210 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 211 return 0; 212 } 213 if (asblk.b_dirty && !bflag) { 214 copyback_sb(&asblk); 215 flush(fswritefd, &asblk); 216 } 217 /* 218 * read in the summary info. 219 */ 220 221 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 222 if (sblock.e2fs_gd == NULL) 223 errexit("out of memory\n"); 224 asked = 0; 225 for (i=0; i < sblock.e2fs_ngdb; i++) { 226 if (bread(fsreadfd,(char *) 227 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 228 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 229 sblock.e2fs_bsize) != 0 && !asked) { 230 pfatal("BAD SUMMARY INFORMATION"); 231 if (reply("CONTINUE") == 0) 232 errexit("%s\n", ""); 233 asked++; 234 } 235 } 236 /* 237 * allocate and initialize the necessary maps 238 */ 239 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 240 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 241 if (blockmap == NULL) { 242 printf("cannot alloc %u bytes for blockmap\n", 243 (unsigned)bmapsize); 244 goto badsblabel; 245 } 246 statemap = calloc((unsigned)(maxino + 2), sizeof(char)); 247 if (statemap == NULL) { 248 printf("cannot alloc %u bytes for statemap\n", 249 (unsigned)(maxino + 1)); 250 goto badsblabel; 251 } 252 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 253 if (typemap == NULL) { 254 printf("cannot alloc %u bytes for typemap\n", 255 (unsigned)(maxino + 1)); 256 goto badsblabel; 257 } 258 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 259 if (lncntp == NULL) { 260 printf("cannot alloc %u bytes for lncntp\n", 261 (unsigned)((maxino + 1) * sizeof(int16_t))); 262 goto badsblabel; 263 } 264 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 265 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 266 } 267 inplast = 0; 268 listmax = numdirs + 10; 269 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 270 sizeof(struct inoinfo *)); 271 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 272 sizeof(struct inoinfo *)); 273 if (inpsort == NULL || inphead == NULL) { 274 printf("cannot alloc %u bytes for inphead\n", 275 (unsigned)(numdirs * sizeof(struct inoinfo *))); 276 goto badsblabel; 277 } 278 bufinit(); 279 return (1); 280 281 badsblabel: 282 ckfini(0); 283 return (0); 284 } 285 286 /* 287 * Read in the super block and its summary info, convert to host byte order. 288 */ 289 static int 290 readsb(listerr) 291 int listerr; 292 { 293 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 294 295 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 296 return (0); 297 sblk.b_bno = super; 298 sblk.b_size = SBSIZE; 299 300 /* Copy the superblock in memory */ 301 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 302 303 /* 304 * run a few consistency checks of the super block 305 */ 306 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 307 badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 308 } 309 if (sblock.e2fs.e2fs_log_bsize > 2) { 310 badsb(listerr, "BAD LOG_BSIZE"); return (0); 311 } 312 313 /* compute the dynamic fields of the in-memory sb */ 314 /* compute dynamic sb infos */ 315 sblock.e2fs_ncg = 316 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 317 sblock.e2fs.e2fs_bpg); 318 /* XXX assume hw bsize = 512 */ 319 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 320 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 321 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 322 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 323 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 324 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 325 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 326 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 327 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 328 329 /* 330 * Compute block size that the filesystem is based on, 331 * according to fsbtodb, and adjust superblock block number 332 * so we can tell if this is an alternate later. 333 */ 334 super *= dev_bsize; 335 dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1); 336 sblk.b_bno = super / dev_bsize; 337 338 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 339 (long)SBSIZE); 340 if (asblk.b_errs) 341 return (0); 342 if (bflag) { 343 havesb = 1; 344 return (1); 345 } 346 347 /* 348 * Set all possible fields that could differ, then do check 349 * of whole super block against an alternate super block. 350 * When an alternate super-block is specified this check is skipped. 351 */ 352 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 353 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 354 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 355 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 356 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 357 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 358 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 359 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 360 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 361 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 362 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 363 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 364 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 365 asblk.b_un.b_fs->e2fs_block_group_nr = 366 sblk.b_un.b_fs->e2fs_block_group_nr; 367 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 368 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || 369 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { 370 if (debug) { 371 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 372 "0x%08x\n", 373 sblock.e2fs.e2fs_features_compat, 374 sblock.e2fs.e2fs_features_incompat, 375 sblock.e2fs.e2fs_features_rocompat); 376 } 377 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 378 return 0; 379 } 380 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 381 if (debug) { 382 u_int32_t *nlp, *olp, *endlp; 383 384 printf("superblock mismatches\n"); 385 nlp = (u_int32_t *)asblk.b_un.b_fs; 386 olp = (u_int32_t *)sblk.b_un.b_fs; 387 endlp = olp + (SBSIZE / sizeof *olp); 388 for ( ; olp < endlp; olp++, nlp++) { 389 if (*olp == *nlp) 390 continue; 391 printf("offset %ld, original %ld, alternate %ld\n", 392 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 393 (long)fs2h32(*olp), 394 (long)fs2h32(*nlp)); 395 } 396 } 397 badsb(listerr, 398 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 399 return (0); 400 } 401 havesb = 1; 402 return (1); 403 } 404 405 void 406 copyback_sb(bp) 407 struct bufarea *bp; 408 { 409 /* Copy the in-memory superblock back to buffer */ 410 bp->b_un.b_fs->e2fs_icount = fs2h32(sblock.e2fs.e2fs_icount); 411 bp->b_un.b_fs->e2fs_bcount = fs2h32(sblock.e2fs.e2fs_bcount); 412 bp->b_un.b_fs->e2fs_rbcount = fs2h32(sblock.e2fs.e2fs_rbcount); 413 bp->b_un.b_fs->e2fs_fbcount = fs2h32(sblock.e2fs.e2fs_fbcount); 414 bp->b_un.b_fs->e2fs_ficount = fs2h32(sblock.e2fs.e2fs_ficount); 415 bp->b_un.b_fs->e2fs_first_dblock = 416 fs2h32(sblock.e2fs.e2fs_first_dblock); 417 bp->b_un.b_fs->e2fs_log_bsize = fs2h32(sblock.e2fs.e2fs_log_bsize); 418 bp->b_un.b_fs->e2fs_fsize = fs2h32(sblock.e2fs.e2fs_fsize); 419 bp->b_un.b_fs->e2fs_bpg = fs2h32(sblock.e2fs.e2fs_bpg); 420 bp->b_un.b_fs->e2fs_fpg = fs2h32(sblock.e2fs.e2fs_fpg); 421 bp->b_un.b_fs->e2fs_ipg = fs2h32(sblock.e2fs.e2fs_ipg); 422 bp->b_un.b_fs->e2fs_mtime = fs2h32(sblock.e2fs.e2fs_mtime); 423 bp->b_un.b_fs->e2fs_wtime = fs2h32(sblock.e2fs.e2fs_wtime); 424 bp->b_un.b_fs->e2fs_lastfsck = fs2h32(sblock.e2fs.e2fs_lastfsck); 425 bp->b_un.b_fs->e2fs_fsckintv = fs2h32(sblock.e2fs.e2fs_fsckintv); 426 bp->b_un.b_fs->e2fs_creator = fs2h32(sblock.e2fs.e2fs_creator); 427 bp->b_un.b_fs->e2fs_rev = fs2h32(sblock.e2fs.e2fs_rev); 428 bp->b_un.b_fs->e2fs_mnt_count = fs2h16(sblock.e2fs.e2fs_mnt_count); 429 bp->b_un.b_fs->e2fs_max_mnt_count = 430 fs2h16(sblock.e2fs.e2fs_max_mnt_count); 431 bp->b_un.b_fs->e2fs_magic = fs2h16(sblock.e2fs.e2fs_magic); 432 bp->b_un.b_fs->e2fs_state = fs2h16(sblock.e2fs.e2fs_state); 433 bp->b_un.b_fs->e2fs_beh = fs2h16(sblock.e2fs.e2fs_beh); 434 bp->b_un.b_fs->e2fs_ruid = fs2h16(sblock.e2fs.e2fs_ruid); 435 bp->b_un.b_fs->e2fs_rgid = fs2h16(sblock.e2fs.e2fs_rgid); 436 } 437 438 void 439 badsb(listerr, s) 440 int listerr; 441 char *s; 442 { 443 444 if (!listerr) 445 return; 446 if (preen) 447 printf("%s: ", cdevname()); 448 pfatal("BAD SUPER BLOCK: %s\n", s); 449 } 450 451 /* 452 * Calculate a prototype superblock based on information in the disk label. 453 * When done the cgsblock macro can be calculated and the fs_ncg field 454 * can be used. Do NOT attempt to use other macros without verifying that 455 * their needed information is available! 456 */ 457 458 int 459 calcsb(dev, devfd, fs) 460 const char *dev; 461 int devfd; 462 struct m_ext2fs *fs; 463 { 464 struct disklabel *lp; 465 struct partition *pp; 466 char *cp; 467 468 cp = strchr(dev, '\0') - 1; 469 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 470 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 471 return (0); 472 } 473 lp = getdisklabel(dev, devfd); 474 if (isdigit(*cp)) 475 pp = &lp->d_partitions[0]; 476 else 477 pp = &lp->d_partitions[*cp - 'a']; 478 if (pp->p_fstype != FS_EX2FS) { 479 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 480 dev, pp->p_fstype < FSMAXTYPES ? 481 fstypenames[pp->p_fstype] : "unknown"); 482 return (0); 483 } 484 memset(fs, 0, sizeof(struct m_ext2fs)); 485 fs->e2fs_bsize = pp->p_fsize; 486 fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024; 487 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 488 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 489 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 490 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 491 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 492 fs->e2fs_bmask = ~fs->e2fs_qbmask; 493 fs->e2fs_ncg = 494 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 495 fs->e2fs.e2fs_bpg); 496 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 497 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 498 fs->e2fs_bsize / sizeof(struct ext2_gd)); 499 500 return (1); 501 } 502 503 static struct disklabel * 504 getdisklabel(s, fd) 505 const char *s; 506 int fd; 507 { 508 static struct disklabel lab; 509 510 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 511 if (s == NULL) 512 return ((struct disklabel *)NULL); 513 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 514 errexit("%s: can't read disk label\n", s); 515 } 516 return (&lab); 517 } 518 519 daddr_t 520 cgoverhead(c) 521 int c; 522 { 523 int overh; 524 overh = 1 /* block bitmap */ + 525 1 /* inode bitmap */ + 526 sblock.e2fs_itpg; 527 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 528 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 529 if (cg_has_sb(c) == 0) 530 return overh; 531 } 532 overh += 1 + sblock.e2fs_ngdb; 533 return overh; 534 } 535