setup.c revision 1.15
1 /* $NetBSD: setup.c,v 1.15 2004/03/22 19:46:53 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 50 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 51 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 52 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 53 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 54 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 58 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 59 */ 60 61 #include <sys/cdefs.h> 62 #ifndef lint 63 #if 0 64 static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94"; 65 #else 66 __RCSID("$NetBSD: setup.c,v 1.15 2004/03/22 19:46:53 bouyer Exp $"); 67 #endif 68 #endif /* not lint */ 69 70 #define FSTYPENAMES 71 #include <sys/param.h> 72 #include <sys/time.h> 73 #include <ufs/ext2fs/ext2fs_dinode.h> 74 #include <ufs/ext2fs/ext2fs.h> 75 #include <sys/stat.h> 76 #include <sys/ioctl.h> 77 #include <sys/disklabel.h> 78 #include <sys/file.h> 79 80 #include <errno.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <ctype.h> 85 86 #include "fsck.h" 87 #include "extern.h" 88 #include "fsutil.h" 89 90 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 91 92 void badsb __P((int, char *)); 93 int calcsb __P((const char *, int, struct m_ext2fs *)); 94 static struct disklabel *getdisklabel __P((const char *, int)); 95 static int readsb __P((int)); 96 97 int 98 setup(dev) 99 const char *dev; 100 { 101 long cg, asked, i; 102 long bmapsize; 103 struct disklabel *lp; 104 off_t sizepb; 105 struct stat statb; 106 struct m_ext2fs proto; 107 int doskipclean; 108 u_int64_t maxfilesize; 109 110 havesb = 0; 111 fswritefd = -1; 112 doskipclean = skipclean; 113 if (stat(dev, &statb) < 0) { 114 printf("Can't stat %s: %s\n", dev, strerror(errno)); 115 return (0); 116 } 117 if (!S_ISCHR(statb.st_mode)) { 118 pfatal("%s is not a character device", dev); 119 if (reply("CONTINUE") == 0) 120 return (0); 121 } 122 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 123 printf("Can't open %s: %s\n", dev, strerror(errno)); 124 return (0); 125 } 126 if (preen == 0) 127 printf("** %s", dev); 128 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 129 fswritefd = -1; 130 if (preen) 131 pfatal("NO WRITE ACCESS"); 132 printf(" (NO WRITE)"); 133 } 134 if (preen == 0) 135 printf("\n"); 136 fsmodified = 0; 137 lfdir = 0; 138 initbarea(&sblk); 139 initbarea(&asblk); 140 sblk.b_un.b_buf = malloc(SBSIZE); 141 asblk.b_un.b_buf = malloc(SBSIZE); 142 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 143 errexit("cannot allocate space for superblock\n"); 144 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 145 dev_bsize = secsize = lp->d_secsize; 146 else 147 dev_bsize = secsize = DEV_BSIZE; 148 /* 149 * Read in the superblock, looking for alternates if necessary 150 */ 151 if (readsb(1) == 0) { 152 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 153 return(0); 154 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 155 return (0); 156 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 157 bflag = fsbtodb(&proto, 158 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); 159 if (readsb(0) != 0) 160 break; 161 } 162 if (cg >= proto.e2fs_ncg) { 163 printf("%s %s\n%s %s\n%s %s\n", 164 "SEARCH FOR ALTERNATE SUPER-BLOCK", 165 "FAILED. YOU MUST USE THE", 166 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 167 "LOCATION OF AN ALTERNATE", 168 "SUPER-BLOCK TO SUPPLY NEEDED", 169 "INFORMATION; SEE fsck_ext2fs(8)."); 170 return(0); 171 } 172 doskipclean = 0; 173 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 174 } 175 if (debug) 176 printf("state = %d\n", sblock.e2fs.e2fs_state); 177 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 178 if (doskipclean) { 179 pwarn("%sile system is clean; not checking\n", 180 preen ? "f" : "** F"); 181 return (-1); 182 } 183 if (!preen) 184 pwarn("** File system is already clean\n"); 185 } 186 maxfsblock = sblock.e2fs.e2fs_bcount; 187 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 188 sizepb = sblock.e2fs_bsize; 189 maxfilesize = sblock.e2fs_bsize * NDADDR - 1; 190 for (i = 0; i < NIADDR; i++) { 191 sizepb *= NINDIR(&sblock); 192 maxfilesize += sizepb; 193 } 194 /* 195 * Check and potentially fix certain fields in the super block. 196 */ 197 if ((sblock.e2fs.e2fs_rbcount < 0) || 198 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 199 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 200 sblock.e2fs.e2fs_rbcount); 201 if (reply("SET TO DEFAULT") == 1) { 202 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; 203 sbdirty(); 204 dirty(&asblk); 205 } 206 } 207 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 208 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 209 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 210 return 0; 211 } 212 if (asblk.b_dirty && !bflag) { 213 copyback_sb(&asblk); 214 flush(fswritefd, &asblk); 215 } 216 /* 217 * read in the summary info. 218 */ 219 220 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 221 if (sblock.e2fs_gd == NULL) 222 errexit("out of memory\n"); 223 asked = 0; 224 for (i=0; i < sblock.e2fs_ngdb; i++) { 225 if (bread(fsreadfd,(char *) 226 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 227 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 228 sblock.e2fs_bsize) != 0 && !asked) { 229 pfatal("BAD SUMMARY INFORMATION"); 230 if (reply("CONTINUE") == 0) 231 errexit("%s\n", ""); 232 asked++; 233 } 234 } 235 /* 236 * allocate and initialize the necessary maps 237 */ 238 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 239 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 240 if (blockmap == NULL) { 241 printf("cannot alloc %u bytes for blockmap\n", 242 (unsigned)bmapsize); 243 goto badsblabel; 244 } 245 statemap = calloc((unsigned)(maxino + 2), sizeof(char)); 246 if (statemap == NULL) { 247 printf("cannot alloc %u bytes for statemap\n", 248 (unsigned)(maxino + 1)); 249 goto badsblabel; 250 } 251 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 252 if (typemap == NULL) { 253 printf("cannot alloc %u bytes for typemap\n", 254 (unsigned)(maxino + 1)); 255 goto badsblabel; 256 } 257 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 258 if (lncntp == NULL) { 259 printf("cannot alloc %u bytes for lncntp\n", 260 (unsigned)((maxino + 1) * sizeof(int16_t))); 261 goto badsblabel; 262 } 263 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 264 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 265 } 266 inplast = 0; 267 listmax = numdirs + 10; 268 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 269 sizeof(struct inoinfo *)); 270 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 271 sizeof(struct inoinfo *)); 272 if (inpsort == NULL || inphead == NULL) { 273 printf("cannot alloc %u bytes for inphead\n", 274 (unsigned)(numdirs * sizeof(struct inoinfo *))); 275 goto badsblabel; 276 } 277 bufinit(); 278 return (1); 279 280 badsblabel: 281 ckfini(0); 282 return (0); 283 } 284 285 /* 286 * Read in the super block and its summary info, convert to host byte order. 287 */ 288 static int 289 readsb(listerr) 290 int listerr; 291 { 292 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 293 294 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 295 return (0); 296 sblk.b_bno = super; 297 sblk.b_size = SBSIZE; 298 299 /* Copy the superblock in memory */ 300 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 301 302 /* 303 * run a few consistency checks of the super block 304 */ 305 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 306 badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 307 } 308 if (sblock.e2fs.e2fs_log_bsize > 2) { 309 badsb(listerr, "BAD LOG_BSIZE"); return (0); 310 } 311 312 /* compute the dynamic fields of the in-memory sb */ 313 /* compute dynamic sb infos */ 314 sblock.e2fs_ncg = 315 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 316 sblock.e2fs.e2fs_bpg); 317 /* XXX assume hw bsize = 512 */ 318 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 319 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 320 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 321 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 322 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 323 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 324 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 325 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 326 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 327 328 /* 329 * Compute block size that the filesystem is based on, 330 * according to fsbtodb, and adjust superblock block number 331 * so we can tell if this is an alternate later. 332 */ 333 super *= dev_bsize; 334 dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1); 335 sblk.b_bno = super / dev_bsize; 336 337 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 338 (long)SBSIZE); 339 if (asblk.b_errs) 340 return (0); 341 if (bflag) { 342 havesb = 1; 343 return (1); 344 } 345 346 /* 347 * Set all possible fields that could differ, then do check 348 * of whole super block against an alternate super block. 349 * When an alternate super-block is specified this check is skipped. 350 */ 351 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 352 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 353 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 354 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 355 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 356 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 357 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 358 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 359 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 360 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 361 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 362 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 363 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 364 asblk.b_un.b_fs->e2fs_block_group_nr = 365 sblk.b_un.b_fs->e2fs_block_group_nr; 366 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 367 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || 368 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { 369 if (debug) { 370 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 371 "0x%08x\n", 372 sblock.e2fs.e2fs_features_compat, 373 sblock.e2fs.e2fs_features_incompat, 374 sblock.e2fs.e2fs_features_rocompat); 375 } 376 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 377 return 0; 378 } 379 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 380 if (debug) { 381 u_int32_t *nlp, *olp, *endlp; 382 383 printf("superblock mismatches\n"); 384 nlp = (u_int32_t *)asblk.b_un.b_fs; 385 olp = (u_int32_t *)sblk.b_un.b_fs; 386 endlp = olp + (SBSIZE / sizeof *olp); 387 for ( ; olp < endlp; olp++, nlp++) { 388 if (*olp == *nlp) 389 continue; 390 printf("offset %ld, original %ld, alternate %ld\n", 391 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 392 (long)fs2h32(*olp), 393 (long)fs2h32(*nlp)); 394 } 395 } 396 badsb(listerr, 397 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 398 return (0); 399 } 400 havesb = 1; 401 return (1); 402 } 403 404 void 405 copyback_sb(bp) 406 struct bufarea *bp; 407 { 408 /* Copy the in-memory superblock back to buffer */ 409 bp->b_un.b_fs->e2fs_icount = fs2h32(sblock.e2fs.e2fs_icount); 410 bp->b_un.b_fs->e2fs_bcount = fs2h32(sblock.e2fs.e2fs_bcount); 411 bp->b_un.b_fs->e2fs_rbcount = fs2h32(sblock.e2fs.e2fs_rbcount); 412 bp->b_un.b_fs->e2fs_fbcount = fs2h32(sblock.e2fs.e2fs_fbcount); 413 bp->b_un.b_fs->e2fs_ficount = fs2h32(sblock.e2fs.e2fs_ficount); 414 bp->b_un.b_fs->e2fs_first_dblock = 415 fs2h32(sblock.e2fs.e2fs_first_dblock); 416 bp->b_un.b_fs->e2fs_log_bsize = fs2h32(sblock.e2fs.e2fs_log_bsize); 417 bp->b_un.b_fs->e2fs_fsize = fs2h32(sblock.e2fs.e2fs_fsize); 418 bp->b_un.b_fs->e2fs_bpg = fs2h32(sblock.e2fs.e2fs_bpg); 419 bp->b_un.b_fs->e2fs_fpg = fs2h32(sblock.e2fs.e2fs_fpg); 420 bp->b_un.b_fs->e2fs_ipg = fs2h32(sblock.e2fs.e2fs_ipg); 421 bp->b_un.b_fs->e2fs_mtime = fs2h32(sblock.e2fs.e2fs_mtime); 422 bp->b_un.b_fs->e2fs_wtime = fs2h32(sblock.e2fs.e2fs_wtime); 423 bp->b_un.b_fs->e2fs_lastfsck = fs2h32(sblock.e2fs.e2fs_lastfsck); 424 bp->b_un.b_fs->e2fs_fsckintv = fs2h32(sblock.e2fs.e2fs_fsckintv); 425 bp->b_un.b_fs->e2fs_creator = fs2h32(sblock.e2fs.e2fs_creator); 426 bp->b_un.b_fs->e2fs_rev = fs2h32(sblock.e2fs.e2fs_rev); 427 bp->b_un.b_fs->e2fs_mnt_count = fs2h16(sblock.e2fs.e2fs_mnt_count); 428 bp->b_un.b_fs->e2fs_max_mnt_count = 429 fs2h16(sblock.e2fs.e2fs_max_mnt_count); 430 bp->b_un.b_fs->e2fs_magic = fs2h16(sblock.e2fs.e2fs_magic); 431 bp->b_un.b_fs->e2fs_state = fs2h16(sblock.e2fs.e2fs_state); 432 bp->b_un.b_fs->e2fs_beh = fs2h16(sblock.e2fs.e2fs_beh); 433 bp->b_un.b_fs->e2fs_ruid = fs2h16(sblock.e2fs.e2fs_ruid); 434 bp->b_un.b_fs->e2fs_rgid = fs2h16(sblock.e2fs.e2fs_rgid); 435 } 436 437 void 438 badsb(listerr, s) 439 int listerr; 440 char *s; 441 { 442 443 if (!listerr) 444 return; 445 if (preen) 446 printf("%s: ", cdevname()); 447 pfatal("BAD SUPER BLOCK: %s\n", s); 448 } 449 450 /* 451 * Calculate a prototype superblock based on information in the disk label. 452 * When done the cgsblock macro can be calculated and the fs_ncg field 453 * can be used. Do NOT attempt to use other macros without verifying that 454 * their needed information is available! 455 */ 456 457 int 458 calcsb(dev, devfd, fs) 459 const char *dev; 460 int devfd; 461 struct m_ext2fs *fs; 462 { 463 struct disklabel *lp; 464 struct partition *pp; 465 char *cp; 466 467 cp = strchr(dev, '\0') - 1; 468 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 469 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 470 return (0); 471 } 472 lp = getdisklabel(dev, devfd); 473 if (isdigit(*cp)) 474 pp = &lp->d_partitions[0]; 475 else 476 pp = &lp->d_partitions[*cp - 'a']; 477 if (pp->p_fstype != FS_EX2FS) { 478 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 479 dev, pp->p_fstype < FSMAXTYPES ? 480 fstypenames[pp->p_fstype] : "unknown"); 481 return (0); 482 } 483 memset(fs, 0, sizeof(struct m_ext2fs)); 484 fs->e2fs_bsize = pp->p_fsize; 485 fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024; 486 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 487 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 488 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 489 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 490 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 491 fs->e2fs_bmask = ~fs->e2fs_qbmask; 492 fs->e2fs_ncg = 493 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 494 fs->e2fs.e2fs_bpg); 495 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 496 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 497 fs->e2fs_bsize / sizeof(struct ext2_gd)); 498 499 return (1); 500 } 501 502 static struct disklabel * 503 getdisklabel(s, fd) 504 const char *s; 505 int fd; 506 { 507 static struct disklabel lab; 508 509 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 510 if (s == NULL) 511 return ((struct disklabel *)NULL); 512 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 513 errexit("%s: can't read disk label\n", s); 514 } 515 return (&lab); 516 } 517 518 daddr_t 519 cgoverhead(c) 520 int c; 521 { 522 int overh; 523 overh = 1 /* block bitmap */ + 524 1 /* inode bitmap */ + 525 sblock.e2fs_itpg; 526 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 527 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 528 if (cg_has_sb(c) == 0) 529 return overh; 530 } 531 overh += 1 + sblock.e2fs_ngdb; 532 return overh; 533 } 534
Indexes created Mon Oct 27 20:09:55 GMT 2025