1 /* $NetBSD: setup.c,v 1.13 2003/08/07 10:04:18 agc 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 the University of 46 * California, Berkeley and its contributors. 47 * 4. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/cdefs.h> 65 #ifndef lint 66 #if 0 67 static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94"; 68 #else 69 __RCSID("$NetBSD: setup.c,v 1.13 2003/08/07 10:04:18 agc Exp $"); 70 #endif 71 #endif /* not lint */ 72 73 #define FSTYPENAMES 74 #include <sys/param.h> 75 #include <sys/time.h> 76 #include <ufs/ext2fs/ext2fs_dinode.h> 77 #include <ufs/ext2fs/ext2fs.h> 78 #include <sys/stat.h> 79 #include <sys/ioctl.h> 80 #include <sys/disklabel.h> 81 #include <sys/file.h> 82 83 #include <errno.h> 84 #include <stdio.h> 85 #include <stdlib.h> 86 #include <string.h> 87 #include <ctype.h> 88 89 #include "fsck.h" 90 #include "extern.h" 91 #include "fsutil.h" 92 93 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 94 95 void badsb __P((int, char *)); 96 int calcsb __P((const char *, int, struct m_ext2fs *)); 97 static struct disklabel *getdisklabel __P((const char *, int)); 98 static int readsb __P((int)); 99 100 int 101 setup(dev) 102 const char *dev; 103 { 104 long cg, asked, i; 105 long bmapsize; 106 struct disklabel *lp; 107 off_t sizepb; 108 struct stat statb; 109 struct m_ext2fs proto; 110 int doskipclean; 111 u_int64_t maxfilesize; 112 113 havesb = 0; 114 fswritefd = -1; 115 doskipclean = skipclean; 116 if (stat(dev, &statb) < 0) { 117 printf("Can't stat %s: %s\n", dev, strerror(errno)); 118 return (0); 119 } 120 if (!S_ISCHR(statb.st_mode)) { 121 pfatal("%s is not a character device", dev); 122 if (reply("CONTINUE") == 0) 123 return (0); 124 } 125 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 126 printf("Can't open %s: %s\n", dev, strerror(errno)); 127 return (0); 128 } 129 if (preen == 0) 130 printf("** %s", dev); 131 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 132 fswritefd = -1; 133 if (preen) 134 pfatal("NO WRITE ACCESS"); 135 printf(" (NO WRITE)"); 136 } 137 if (preen == 0) 138 printf("\n"); 139 fsmodified = 0; 140 lfdir = 0; 141 initbarea(&sblk); 142 initbarea(&asblk); 143 sblk.b_un.b_buf = malloc(SBSIZE); 144 asblk.b_un.b_buf = malloc(SBSIZE); 145 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 146 errexit("cannot allocate space for superblock\n"); 147 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 148 dev_bsize = secsize = lp->d_secsize; 149 else 150 dev_bsize = secsize = DEV_BSIZE; 151 /* 152 * Read in the superblock, looking for alternates if necessary 153 */ 154 if (readsb(1) == 0) { 155 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 156 return(0); 157 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 158 return (0); 159 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 160 bflag = fsbtodb(&proto, 161 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); 162 if (readsb(0) != 0) 163 break; 164 } 165 if (cg >= proto.e2fs_ncg) { 166 printf("%s %s\n%s %s\n%s %s\n", 167 "SEARCH FOR ALTERNATE SUPER-BLOCK", 168 "FAILED. YOU MUST USE THE", 169 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 170 "LOCATION OF AN ALTERNATE", 171 "SUPER-BLOCK TO SUPPLY NEEDED", 172 "INFORMATION; SEE fsck_ext2fs(8)."); 173 return(0); 174 } 175 doskipclean = 0; 176 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 177 } 178 if (debug) 179 printf("state = %d\n", sblock.e2fs.e2fs_state); 180 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 181 if (doskipclean) { 182 pwarn("%sile system is clean; not checking\n", 183 preen ? "f" : "** F"); 184 return (-1); 185 } 186 if (!preen) 187 pwarn("** File system is already clean\n"); 188 } 189 maxfsblock = sblock.e2fs.e2fs_bcount; 190 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 191 sizepb = sblock.e2fs_bsize; 192 maxfilesize = sblock.e2fs_bsize * NDADDR - 1; 193 for (i = 0; i < NIADDR; i++) { 194 sizepb *= NINDIR(&sblock); 195 maxfilesize += sizepb; 196 } 197 /* 198 * Check and potentially fix certain fields in the super block. 199 */ 200 if ((sblock.e2fs.e2fs_rbcount < 0) || 201 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 202 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 203 sblock.e2fs.e2fs_rbcount); 204 if (reply("SET TO DEFAULT") == 1) { 205 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; 206 sbdirty(); 207 dirty(&asblk); 208 } 209 } 210 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 211 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 212 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 213 return 0; 214 } 215 if (asblk.b_dirty && !bflag) { 216 copyback_sb(&asblk); 217 flush(fswritefd, &asblk); 218 } 219 /* 220 * read in the summary info. 221 */ 222 223 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 224 if (sblock.e2fs_gd == NULL) 225 errexit("out of memory\n"); 226 asked = 0; 227 for (i=0; i < sblock.e2fs_ngdb; i++) { 228 if (bread(fsreadfd,(char *) 229 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 230 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 231 sblock.e2fs_bsize) != 0 && !asked) { 232 pfatal("BAD SUMMARY INFORMATION"); 233 if (reply("CONTINUE") == 0) 234 errexit("%s\n", ""); 235 asked++; 236 } 237 } 238 /* 239 * allocate and initialize the necessary maps 240 */ 241 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 242 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 243 if (blockmap == NULL) { 244 printf("cannot alloc %u bytes for blockmap\n", 245 (unsigned)bmapsize); 246 goto badsblabel; 247 } 248 statemap = calloc((unsigned)(maxino + 2), sizeof(char)); 249 if (statemap == NULL) { 250 printf("cannot alloc %u bytes for statemap\n", 251 (unsigned)(maxino + 1)); 252 goto badsblabel; 253 } 254 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 255 if (typemap == NULL) { 256 printf("cannot alloc %u bytes for typemap\n", 257 (unsigned)(maxino + 1)); 258 goto badsblabel; 259 } 260 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 261 if (lncntp == NULL) { 262 printf("cannot alloc %u bytes for lncntp\n", 263 (unsigned)((maxino + 1) * sizeof(int16_t))); 264 goto badsblabel; 265 } 266 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 267 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 268 } 269 inplast = 0; 270 listmax = numdirs + 10; 271 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 272 sizeof(struct inoinfo *)); 273 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 274 sizeof(struct inoinfo *)); 275 if (inpsort == NULL || inphead == NULL) { 276 printf("cannot alloc %u bytes for inphead\n", 277 (unsigned)(numdirs * sizeof(struct inoinfo *))); 278 goto badsblabel; 279 } 280 bufinit(); 281 return (1); 282 283 badsblabel: 284 ckfini(0); 285 return (0); 286 } 287 288 /* 289 * Read in the super block and its summary info, convert to host byte order. 290 */ 291 static int 292 readsb(listerr) 293 int listerr; 294 { 295 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 296 297 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 298 return (0); 299 sblk.b_bno = super; 300 sblk.b_size = SBSIZE; 301 302 /* Copy the superblock in memory */ 303 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 304 305 /* 306 * run a few consistency checks of the super block 307 */ 308 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 309 badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 310 } 311 if (sblock.e2fs.e2fs_log_bsize > 2) { 312 badsb(listerr, "BAD LOG_BSIZE"); return (0); 313 } 314 315 /* compute the dynamic fields of the in-memory sb */ 316 /* compute dynamic sb infos */ 317 sblock.e2fs_ncg = 318 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 319 sblock.e2fs.e2fs_bpg); 320 /* XXX assume hw bsize = 512 */ 321 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 322 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 323 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 324 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 325 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 326 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 327 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 328 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 329 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 330 331 /* 332 * Compute block size that the filesystem is based on, 333 * according to fsbtodb, and adjust superblock block number 334 * so we can tell if this is an alternate later. 335 */ 336 super *= dev_bsize; 337 dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1); 338 sblk.b_bno = super / dev_bsize; 339 340 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 341 (long)SBSIZE); 342 if (asblk.b_errs) 343 return (0); 344 if (bflag) { 345 havesb = 1; 346 return (1); 347 } 348 349 /* 350 * Set all possible fields that could differ, then do check 351 * of whole super block against an alternate super block. 352 * When an alternate super-block is specified this check is skipped. 353 */ 354 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 355 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 356 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 357 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 358 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 359 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 360 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 361 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 362 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 363 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 364 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 365 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 366 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 367 asblk.b_un.b_fs->e2fs_block_group_nr = 368 sblk.b_un.b_fs->e2fs_block_group_nr; 369 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 370 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || 371 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { 372 if (debug) { 373 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 374 "0x%08x\n", 375 sblock.e2fs.e2fs_features_compat, 376 sblock.e2fs.e2fs_features_incompat, 377 sblock.e2fs.e2fs_features_rocompat); 378 } 379 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 380 return 0; 381 } 382 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 383 if (debug) { 384 u_int32_t *nlp, *olp, *endlp; 385 386 printf("superblock mismatches\n"); 387 nlp = (u_int32_t *)asblk.b_un.b_fs; 388 olp = (u_int32_t *)sblk.b_un.b_fs; 389 endlp = olp + (SBSIZE / sizeof *olp); 390 for ( ; olp < endlp; olp++, nlp++) { 391 if (*olp == *nlp) 392 continue; 393 printf("offset %ld, original %ld, alternate %ld\n", 394 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 395 (long)fs2h32(*olp), 396 (long)fs2h32(*nlp)); 397 } 398 } 399 badsb(listerr, 400 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 401 return (0); 402 } 403 havesb = 1; 404 return (1); 405 } 406 407 void 408 copyback_sb(bp) 409 struct bufarea *bp; 410 { 411 /* Copy the in-memory superblock back to buffer */ 412 bp->b_un.b_fs->e2fs_icount = fs2h32(sblock.e2fs.e2fs_icount); 413 bp->b_un.b_fs->e2fs_bcount = fs2h32(sblock.e2fs.e2fs_bcount); 414 bp->b_un.b_fs->e2fs_rbcount = fs2h32(sblock.e2fs.e2fs_rbcount); 415 bp->b_un.b_fs->e2fs_fbcount = fs2h32(sblock.e2fs.e2fs_fbcount); 416 bp->b_un.b_fs->e2fs_ficount = fs2h32(sblock.e2fs.e2fs_ficount); 417 bp->b_un.b_fs->e2fs_first_dblock = 418 fs2h32(sblock.e2fs.e2fs_first_dblock); 419 bp->b_un.b_fs->e2fs_log_bsize = fs2h32(sblock.e2fs.e2fs_log_bsize); 420 bp->b_un.b_fs->e2fs_fsize = fs2h32(sblock.e2fs.e2fs_fsize); 421 bp->b_un.b_fs->e2fs_bpg = fs2h32(sblock.e2fs.e2fs_bpg); 422 bp->b_un.b_fs->e2fs_fpg = fs2h32(sblock.e2fs.e2fs_fpg); 423 bp->b_un.b_fs->e2fs_ipg = fs2h32(sblock.e2fs.e2fs_ipg); 424 bp->b_un.b_fs->e2fs_mtime = fs2h32(sblock.e2fs.e2fs_mtime); 425 bp->b_un.b_fs->e2fs_wtime = fs2h32(sblock.e2fs.e2fs_wtime); 426 bp->b_un.b_fs->e2fs_lastfsck = fs2h32(sblock.e2fs.e2fs_lastfsck); 427 bp->b_un.b_fs->e2fs_fsckintv = fs2h32(sblock.e2fs.e2fs_fsckintv); 428 bp->b_un.b_fs->e2fs_creator = fs2h32(sblock.e2fs.e2fs_creator); 429 bp->b_un.b_fs->e2fs_rev = fs2h32(sblock.e2fs.e2fs_rev); 430 bp->b_un.b_fs->e2fs_mnt_count = fs2h16(sblock.e2fs.e2fs_mnt_count); 431 bp->b_un.b_fs->e2fs_max_mnt_count = 432 fs2h16(sblock.e2fs.e2fs_max_mnt_count); 433 bp->b_un.b_fs->e2fs_magic = fs2h16(sblock.e2fs.e2fs_magic); 434 bp->b_un.b_fs->e2fs_state = fs2h16(sblock.e2fs.e2fs_state); 435 bp->b_un.b_fs->e2fs_beh = fs2h16(sblock.e2fs.e2fs_beh); 436 bp->b_un.b_fs->e2fs_ruid = fs2h16(sblock.e2fs.e2fs_ruid); 437 bp->b_un.b_fs->e2fs_rgid = fs2h16(sblock.e2fs.e2fs_rgid); 438 } 439 440 void 441 badsb(listerr, s) 442 int listerr; 443 char *s; 444 { 445 446 if (!listerr) 447 return; 448 if (preen) 449 printf("%s: ", cdevname()); 450 pfatal("BAD SUPER BLOCK: %s\n", s); 451 } 452 453 /* 454 * Calculate a prototype superblock based on information in the disk label. 455 * When done the cgsblock macro can be calculated and the fs_ncg field 456 * can be used. Do NOT attempt to use other macros without verifying that 457 * their needed information is available! 458 */ 459 460 int 461 calcsb(dev, devfd, fs) 462 const char *dev; 463 int devfd; 464 struct m_ext2fs *fs; 465 { 466 struct disklabel *lp; 467 struct partition *pp; 468 char *cp; 469 470 cp = strchr(dev, '\0') - 1; 471 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 472 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 473 return (0); 474 } 475 lp = getdisklabel(dev, devfd); 476 if (isdigit(*cp)) 477 pp = &lp->d_partitions[0]; 478 else 479 pp = &lp->d_partitions[*cp - 'a']; 480 if (pp->p_fstype != FS_EX2FS) { 481 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 482 dev, pp->p_fstype < FSMAXTYPES ? 483 fstypenames[pp->p_fstype] : "unknown"); 484 return (0); 485 } 486 memset(fs, 0, sizeof(struct m_ext2fs)); 487 fs->e2fs_bsize = pp->p_fsize; 488 fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024; 489 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 490 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 491 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 492 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 493 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 494 fs->e2fs_bmask = ~fs->e2fs_qbmask; 495 fs->e2fs_ncg = 496 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 497 fs->e2fs.e2fs_bpg); 498 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 499 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 500 fs->e2fs_bsize / sizeof(struct ext2_gd)); 501 502 return (1); 503 } 504 505 static struct disklabel * 506 getdisklabel(s, fd) 507 const char *s; 508 int fd; 509 { 510 static struct disklabel lab; 511 512 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 513 if (s == NULL) 514 return ((struct disklabel *)NULL); 515 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 516 errexit("%s: can't read disk label\n", s); 517 } 518 return (&lab); 519 } 520 521 daddr_t 522 cgoverhead(c) 523 int c; 524 { 525 int overh; 526 overh = 1 /* block bitmap */ + 527 1 /* inode bitmap */ + 528 sblock.e2fs_itpg; 529 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 530 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 531 if (cg_has_sb(c) == 0) 532 return overh; 533 } 534 overh += 1 + sblock.e2fs_ngdb; 535 return overh; 536 } 537