setup.c revision 1.20
1 /* $NetBSD: setup.c,v 1.20 2006/10/16 03:01:36 christos 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 1.20 2006/10/16 03:01:36 christos 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(int, const char *); 93 int calcsb(const char *, int, struct m_ext2fs *); 94 static struct disklabel *getdisklabel(const char *, int); 95 static int readsb(int); 96 97 int 98 setup(const char *dev) 99 { 100 long cg, asked, i; 101 long bmapsize; 102 struct disklabel *lp; 103 off_t sizepb; 104 struct stat statb; 105 struct m_ext2fs proto; 106 int doskipclean; 107 u_int64_t maxfilesize; 108 109 havesb = 0; 110 fswritefd = -1; 111 doskipclean = skipclean; 112 if (stat(dev, &statb) < 0) { 113 printf("Can't stat %s: %s\n", dev, strerror(errno)); 114 return (0); 115 } 116 if (!S_ISCHR(statb.st_mode)) { 117 pfatal("%s is not a character device", dev); 118 if (reply("CONTINUE") == 0) 119 return (0); 120 } 121 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 122 printf("Can't open %s: %s\n", dev, strerror(errno)); 123 return (0); 124 } 125 if (preen == 0) 126 printf("** %s", dev); 127 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 128 fswritefd = -1; 129 if (preen) 130 pfatal("NO WRITE ACCESS"); 131 printf(" (NO WRITE)"); 132 } 133 if (preen == 0) 134 printf("\n"); 135 fsmodified = 0; 136 lfdir = 0; 137 initbarea(&sblk); 138 initbarea(&asblk); 139 sblk.b_un.b_buf = malloc(SBSIZE); 140 asblk.b_un.b_buf = malloc(SBSIZE); 141 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 142 errexit("cannot allocate space for superblock\n"); 143 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 144 dev_bsize = secsize = lp->d_secsize; 145 else 146 dev_bsize = secsize = DEV_BSIZE; 147 /* 148 * Read in the superblock, looking for alternates if necessary 149 */ 150 if (readsb(1) == 0) { 151 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 152 return(0); 153 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 154 return (0); 155 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 156 bflag = fsbtodb(&proto, 157 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); 158 if (readsb(0) != 0) 159 break; 160 } 161 if (cg >= proto.e2fs_ncg) { 162 printf("%s %s\n%s %s\n%s %s\n", 163 "SEARCH FOR ALTERNATE SUPER-BLOCK", 164 "FAILED. YOU MUST USE THE", 165 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 166 "LOCATION OF AN ALTERNATE", 167 "SUPER-BLOCK TO SUPPLY NEEDED", 168 "INFORMATION; SEE fsck_ext2fs(8)."); 169 return(0); 170 } 171 doskipclean = 0; 172 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 173 } 174 if (debug) 175 printf("state = %d\n", sblock.e2fs.e2fs_state); 176 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 177 if (doskipclean) { 178 pwarn("%sile system is clean; not checking\n", 179 preen ? "f" : "** F"); 180 return (-1); 181 } 182 if (!preen) 183 pwarn("** File system is already clean\n"); 184 } 185 maxfsblock = sblock.e2fs.e2fs_bcount; 186 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 187 sizepb = sblock.e2fs_bsize; 188 maxfilesize = sblock.e2fs_bsize * NDADDR - 1; 189 for (i = 0; i < NIADDR; i++) { 190 sizepb *= NINDIR(&sblock); 191 maxfilesize += sizepb; 192 } 193 /* 194 * Check and potentially fix certain fields in the super block. 195 */ 196 if (/* (sblock.e2fs.e2fs_rbcount < 0) || */ 197 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 198 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 199 sblock.e2fs.e2fs_rbcount); 200 if (reply("SET TO DEFAULT") == 1) { 201 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; 202 sbdirty(); 203 dirty(&asblk); 204 } 205 } 206 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 207 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 208 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 209 return 0; 210 } 211 if (asblk.b_dirty && !bflag) { 212 copyback_sb(&asblk); 213 flush(fswritefd, &asblk); 214 } 215 /* 216 * read in the summary info. 217 */ 218 219 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 220 if (sblock.e2fs_gd == NULL) 221 errexit("out of memory\n"); 222 asked = 0; 223 for (i=0; i < sblock.e2fs_ngdb; i++) { 224 if (bread(fsreadfd,(char *) 225 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 226 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 227 sblock.e2fs_bsize) != 0 && !asked) { 228 pfatal("BAD SUMMARY INFORMATION"); 229 if (reply("CONTINUE") == 0) 230 errexit("%s\n", ""); 231 asked++; 232 } 233 } 234 /* 235 * allocate and initialize the necessary maps 236 */ 237 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 238 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 239 if (blockmap == NULL) { 240 printf("cannot alloc %u bytes for blockmap\n", 241 (unsigned)bmapsize); 242 goto badsblabel; 243 } 244 statemap = calloc((unsigned)(maxino + 2), sizeof(char)); 245 if (statemap == NULL) { 246 printf("cannot alloc %u bytes for statemap\n", 247 (unsigned)(maxino + 1)); 248 goto badsblabel; 249 } 250 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 251 if (typemap == NULL) { 252 printf("cannot alloc %u bytes for typemap\n", 253 (unsigned)(maxino + 1)); 254 goto badsblabel; 255 } 256 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 257 if (lncntp == NULL) { 258 printf("cannot alloc %u bytes for lncntp\n", 259 (unsigned)((maxino + 1) * sizeof(int16_t))); 260 goto badsblabel; 261 } 262 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 263 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 264 } 265 inplast = 0; 266 listmax = numdirs + 10; 267 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 268 sizeof(struct inoinfo *)); 269 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 270 sizeof(struct inoinfo *)); 271 if (inpsort == NULL || inphead == NULL) { 272 printf("cannot alloc %u bytes for inphead\n", 273 (unsigned)(numdirs * sizeof(struct inoinfo *))); 274 goto badsblabel; 275 } 276 bufinit(); 277 return (1); 278 279 badsblabel: 280 ckfini(0); 281 return (0); 282 } 283 284 /* 285 * Read in the super block and its summary info, convert to host byte order. 286 */ 287 static int 288 readsb(int listerr) 289 { 290 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 291 292 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 293 return (0); 294 sblk.b_bno = super; 295 sblk.b_size = SBSIZE; 296 297 /* Copy the superblock in memory */ 298 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 299 300 /* 301 * run a few consistency checks of the super block 302 */ 303 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 304 badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 305 } 306 if (sblock.e2fs.e2fs_log_bsize > 2) { 307 badsb(listerr, "BAD LOG_BSIZE"); return (0); 308 } 309 310 /* compute the dynamic fields of the in-memory sb */ 311 /* compute dynamic sb infos */ 312 sblock.e2fs_ncg = 313 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 314 sblock.e2fs.e2fs_bpg); 315 /* XXX assume hw bsize = 512 */ 316 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 317 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 318 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 319 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 320 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 321 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 322 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 323 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 324 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 325 326 /* 327 * Compute block size that the filesystem is based on, 328 * according to fsbtodb, and adjust superblock block number 329 * so we can tell if this is an alternate later. 330 */ 331 super *= dev_bsize; 332 dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1); 333 sblk.b_bno = super / dev_bsize; 334 335 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 336 (long)SBSIZE); 337 if (asblk.b_errs) 338 return (0); 339 if (bflag) { 340 havesb = 1; 341 return (1); 342 } 343 344 /* 345 * Set all possible fields that could differ, then do check 346 * of whole super block against an alternate super block. 347 * When an alternate super-block is specified this check is skipped. 348 */ 349 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 350 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 351 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 352 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 353 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 354 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 355 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 356 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 357 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 358 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 359 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 360 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 361 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 362 asblk.b_un.b_fs->e2fs_block_group_nr = 363 sblk.b_un.b_fs->e2fs_block_group_nr; 364 asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE; 365 asblk.b_un.b_fs->e2fs_features_rocompat |= 366 sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE; 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(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(int listerr, const char *s) 439 { 440 441 if (!listerr) 442 return; 443 if (preen) 444 printf("%s: ", cdevname()); 445 pfatal("BAD SUPER BLOCK: %s\n", s); 446 } 447 448 /* 449 * Calculate a prototype superblock based on information in the disk label. 450 * When done the cgsblock macro can be calculated and the fs_ncg field 451 * can be used. Do NOT attempt to use other macros without verifying that 452 * their needed information is available! 453 */ 454 455 int 456 calcsb(const char *dev, int devfd, struct m_ext2fs *fs) 457 { 458 struct disklabel *lp; 459 struct partition *pp; 460 char *cp; 461 462 cp = strchr(dev, '\0'); 463 if (cp-- == dev || 464 ((*cp < 'a' || *cp > 'h') && !isdigit((unsigned char)*cp))) { 465 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 466 return (0); 467 } 468 lp = getdisklabel(dev, devfd); 469 if (isdigit((unsigned char)*cp)) 470 pp = &lp->d_partitions[0]; 471 else 472 pp = &lp->d_partitions[*cp - 'a']; 473 if (pp->p_fstype != FS_EX2FS) { 474 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 475 dev, pp->p_fstype < FSMAXTYPES ? 476 fstypenames[pp->p_fstype] : "unknown"); 477 return (0); 478 } 479 memset(fs, 0, sizeof(struct m_ext2fs)); 480 fs->e2fs_bsize = pp->p_fsize; 481 fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024; 482 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 483 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 484 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 485 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 486 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 487 fs->e2fs_bmask = ~fs->e2fs_qbmask; 488 fs->e2fs_ncg = 489 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 490 fs->e2fs.e2fs_bpg); 491 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 492 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 493 fs->e2fs_bsize / sizeof(struct ext2_gd)); 494 495 return (1); 496 } 497 498 static struct disklabel * 499 getdisklabel(const char *s, int fd) 500 { 501 static struct disklabel lab; 502 503 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 504 if (s == NULL) 505 return ((struct disklabel *)NULL); 506 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 507 errexit("%s: can't read disk label\n", s); 508 } 509 return (&lab); 510 } 511 512 daddr_t 513 cgoverhead(int c) 514 { 515 int overh; 516 overh = 1 /* block bitmap */ + 517 1 /* inode bitmap */ + 518 sblock.e2fs_itpg; 519 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 520 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 521 if (cg_has_sb(c) == 0) 522 return overh; 523 } 524 overh += 1 + sblock.e2fs_ngdb; 525 return overh; 526 } 527
Indexes created Mon Oct 20 11:09:49 GMT 2025