1 /* $NetBSD: setup.c,v 1.35 2016/08/15 19:13:24 jdolecek 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 * 44 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 45 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 47 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 48 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 49 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 53 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 */ 55 56 #include <sys/cdefs.h> 57 #ifndef lint 58 #if 0 59 static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94"; 60 #else 61 __RCSID("$NetBSD: setup.c,v 1.35 2016/08/15 19:13:24 jdolecek Exp $"); 62 #endif 63 #endif /* not lint */ 64 65 #define FSTYPENAMES 66 #include <sys/param.h> 67 #include <sys/time.h> 68 #include <ufs/ext2fs/ext2fs_dinode.h> 69 #include <ufs/ext2fs/ext2fs.h> 70 #include <sys/stat.h> 71 #include <sys/ioctl.h> 72 #include <sys/disklabel.h> 73 #include <sys/file.h> 74 75 #include <errno.h> 76 #include <stdio.h> 77 #include <stdlib.h> 78 #include <string.h> 79 #include <ctype.h> 80 81 #include <util.h> 82 83 #include "fsck.h" 84 #include "extern.h" 85 #include "fsutil.h" 86 #include "exitvalues.h" 87 88 void badsb(int, const char *); 89 int calcsb(const char *, int, struct m_ext2fs *); 90 static struct disklabel *getdisklabel(const char *, int); 91 static int readsb(int); 92 93 int 94 setup(const char *dev) 95 { 96 long cg, asked, i; 97 long bmapsize; 98 struct disklabel *lp; 99 off_t sizepb; 100 struct stat statb; 101 struct m_ext2fs proto; 102 int doskipclean; 103 u_int64_t maxfilesize; 104 105 havesb = 0; 106 fswritefd = -1; 107 doskipclean = skipclean; 108 if (stat(dev, &statb) < 0) { 109 printf("Can't stat %s: %s\n", dev, strerror(errno)); 110 return 0; 111 } 112 if (!S_ISCHR(statb.st_mode)) { 113 pfatal("%s is not a character device", dev); 114 if (reply("CONTINUE") == 0) 115 return 0; 116 } 117 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 118 printf("Can't open %s: %s\n", dev, strerror(errno)); 119 return 0; 120 } 121 if (preen == 0) 122 printf("** %s", dev); 123 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 124 fswritefd = -1; 125 if (preen) 126 pfatal("NO WRITE ACCESS"); 127 printf(" (NO WRITE)"); 128 } 129 if (preen == 0) 130 printf("\n"); 131 fsmodified = 0; 132 lfdir = 0; 133 initbarea(&sblk); 134 initbarea(&asblk); 135 sblk.b_un.b_buf = malloc(SBSIZE); 136 asblk.b_un.b_buf = malloc(SBSIZE); 137 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 138 errexit("cannot allocate space for superblock"); 139 if ((lp = getdisklabel(NULL, fsreadfd)) != NULL) 140 dev_bsize = secsize = lp->d_secsize; 141 else 142 dev_bsize = secsize = DEV_BSIZE; 143 /* 144 * Read in the superblock, looking for alternates if necessary 145 */ 146 if (readsb(1) == 0) { 147 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 148 return 0; 149 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 150 return 0; 151 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 152 bflag = EXT2_FSBTODB(&proto, 153 cg * proto.e2fs.e2fs_bpg + 154 proto.e2fs.e2fs_first_dblock); 155 if (readsb(0) != 0) 156 break; 157 } 158 if (cg >= proto.e2fs_ncg) { 159 printf("%s %s\n%s %s\n%s %s\n", 160 "SEARCH FOR ALTERNATE SUPER-BLOCK", 161 "FAILED. YOU MUST USE THE", 162 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 163 "LOCATION OF AN ALTERNATE", 164 "SUPER-BLOCK TO SUPPLY NEEDED", 165 "INFORMATION; SEE fsck_ext2fs(8)."); 166 return 0; 167 } 168 doskipclean = 0; 169 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 170 } 171 if (debug) 172 printf("state = %d\n", sblock.e2fs.e2fs_state); 173 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 174 if (doskipclean) { 175 pwarn("%sile system is clean; not checking\n", 176 preen ? "f" : "** F"); 177 return -1; 178 } 179 if (!preen) 180 pwarn("** File system is already clean\n"); 181 } 182 maxfsblock = sblock.e2fs.e2fs_bcount; 183 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 184 sizepb = sblock.e2fs_bsize; 185 maxfilesize = sblock.e2fs_bsize * EXT2FS_NDADDR - 1; 186 for (i = 0; i < EXT2FS_NIADDR; i++) { 187 sizepb *= EXT2_NINDIR(&sblock); 188 maxfilesize += sizepb; 189 } 190 /* 191 * Check and potentially fix certain fields in the super block. 192 */ 193 if (/* (sblock.e2fs.e2fs_rbcount < 0) || */ 194 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 195 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 196 sblock.e2fs.e2fs_rbcount); 197 if (reply("SET TO DEFAULT") == 1) { 198 sblock.e2fs.e2fs_rbcount = 199 sblock.e2fs.e2fs_bcount * MINFREE / 100; 200 sbdirty(); 201 dirty(&asblk); 202 } 203 } 204 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 205 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 206 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 207 return 0; 208 } 209 if (asblk.b_dirty && !bflag) { 210 copyback_sb(&asblk); 211 flush(fswritefd, &asblk); 212 } 213 /* 214 * read in the summary info. 215 */ 216 217 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 218 if (sblock.e2fs_gd == NULL) 219 errexit("out of memory"); 220 asked = 0; 221 for (i = 0; i < sblock.e2fs_ngdb; i++) { 222 if (bread(fsreadfd, 223 (char *)&sblock.e2fs_gd[i * sblock.e2fs_bsize / 224 sizeof(struct ext2_gd)], 225 EXT2_FSBTODB(&sblock, ((sblock.e2fs_bsize > 1024) ? 0 : 1) + 226 i + 1), 227 sblock.e2fs_bsize) != 0 && !asked) { 228 pfatal("BAD SUMMARY INFORMATION"); 229 if (reply("CONTINUE") == 0) 230 exit(FSCK_EXIT_CHECK_FAILED); 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 int)bmapsize, sizeof(char)); 239 if (blockmap == NULL) { 240 printf("cannot alloc %u bytes for blockmap\n", 241 (unsigned int)bmapsize); 242 goto badsblabel; 243 } 244 statemap = calloc((unsigned int)(maxino + 2), sizeof(char)); 245 if (statemap == NULL) { 246 printf("cannot alloc %u bytes for statemap\n", 247 (unsigned int)(maxino + 1)); 248 goto badsblabel; 249 } 250 typemap = calloc((unsigned int)(maxino + 1), sizeof(char)); 251 if (typemap == NULL) { 252 printf("cannot alloc %u bytes for typemap\n", 253 (unsigned int)(maxino + 1)); 254 goto badsblabel; 255 } 256 lncntp = calloc((unsigned)(maxino + 1), sizeof(int16_t)); 257 if (lncntp == NULL) { 258 printf("cannot alloc %u bytes for lncntp\n", 259 (unsigned int)((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 = calloc((unsigned int)listmax, sizeof(struct inoinfo *)); 268 inphead = calloc((unsigned int)numdirs, sizeof(struct inoinfo *)); 269 if (inpsort == NULL || inphead == NULL) { 270 printf("cannot alloc %u bytes for inphead\n", 271 (unsigned int)(numdirs * sizeof(struct inoinfo *))); 272 goto badsblabel; 273 } 274 bufinit(); 275 return 1; 276 277 badsblabel: 278 ckfini(0); 279 return 0; 280 } 281 282 /* 283 * Read in the super block and its summary info, convert to host byte order. 284 */ 285 static int 286 readsb(int listerr) 287 { 288 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 289 290 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 291 return 0; 292 sblk.b_bno = super; 293 sblk.b_size = SBSIZE; 294 295 /* Copy the superblock in memory */ 296 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 297 298 /* 299 * run a few consistency checks of the super block 300 */ 301 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 302 badsb(listerr, "MAGIC NUMBER WRONG"); 303 return 0; 304 } 305 if (sblock.e2fs.e2fs_log_bsize > 2) { 306 badsb(listerr, "BAD LOG_BSIZE"); 307 return 0; 308 } 309 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 310 (!powerof2(sblock.e2fs.e2fs_inode_size) || 311 sblock.e2fs.e2fs_inode_size < EXT2_REV0_DINODE_SIZE || 312 sblock.e2fs.e2fs_inode_size > 313 (1024 << sblock.e2fs.e2fs_log_bsize))) { 314 badsb(listerr, "BAD INODE_SIZE"); 315 return 0; 316 } 317 318 /* compute the dynamic fields of the in-memory sb */ 319 /* compute dynamic sb infos */ 320 sblock.e2fs_ncg = 321 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 322 sblock.e2fs.e2fs_bpg); 323 /* XXX assume hw bsize = 512 */ 324 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 325 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 326 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 327 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 328 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 329 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 330 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 331 sblock.e2fs_ipb = sblock.e2fs_bsize / EXT2_DINODE_SIZE(&sblock); 332 sblock.e2fs_itpg = howmany(sblock.e2fs.e2fs_ipg, sblock.e2fs_ipb); 333 334 /* 335 * Compute block size that the filesystem is based on, 336 * according to fsbtodb, and adjust superblock block number 337 * so we can tell if this is an alternate later. 338 */ 339 super *= dev_bsize; 340 dev_bsize = sblock.e2fs_bsize / EXT2_FSBTODB(&sblock, 1); 341 sblk.b_bno = super / dev_bsize; 342 343 if (sblock.e2fs_ncg == 1) { 344 /* no alternate superblock; assume it's okay */ 345 havesb = 1; 346 return 1; 347 } 348 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 349 (long)SBSIZE); 350 if (asblk.b_errs) 351 return 0; 352 if (bflag) { 353 havesb = 1; 354 return 1; 355 } 356 357 /* 358 * Set all possible fields that could differ, then do check 359 * of whole super block against an alternate super block. 360 * When an alternate super-block is specified this check is skipped. 361 */ 362 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 363 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 364 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 365 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 366 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 367 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 368 asblk.b_un.b_fs->e2fs_max_mnt_count = 369 sblk.b_un.b_fs->e2fs_max_mnt_count; 370 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 371 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 372 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 373 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 374 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 375 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 376 asblk.b_un.b_fs->e2fs_block_group_nr = 377 sblk.b_un.b_fs->e2fs_block_group_nr; 378 asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE; 379 asblk.b_un.b_fs->e2fs_features_rocompat |= 380 sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE; 381 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 382 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP_FSCK) || 383 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP_FSCK))) { 384 if (debug) { 385 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 386 "0x%08x\n", 387 sblock.e2fs.e2fs_features_compat, 388 sblock.e2fs.e2fs_features_incompat, 389 sblock.e2fs.e2fs_features_rocompat); 390 391 if ((sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP_FSCK)) { 392 char buf[512]; 393 394 snprintb(buf, sizeof(buf), EXT2F_ROCOMPAT_BITS, 395 sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP_FSCK); 396 printf("unsupported rocompat features: %s\n", buf); 397 } 398 if ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP_FSCK)) { 399 char buf[512]; 400 401 snprintb(buf, sizeof(buf), EXT2F_INCOMPAT_BITS, 402 sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP_FSCK); 403 printf("unsupported incompat features: %s\n", buf); 404 } 405 } 406 badsb(listerr, "INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 407 return 0; 408 } 409 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 410 if (debug) { 411 u_int32_t *nlp, *olp, *endlp; 412 413 printf("superblock mismatches\n"); 414 nlp = (u_int32_t *)asblk.b_un.b_fs; 415 olp = (u_int32_t *)sblk.b_un.b_fs; 416 endlp = olp + (SBSIZE / sizeof(*olp)); 417 for ( ; olp < endlp; olp++, nlp++) { 418 if (*olp == *nlp) 419 continue; 420 printf("offset %ld, original %ld, " 421 "alternate %ld\n", 422 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 423 (long)fs2h32(*olp), 424 (long)fs2h32(*nlp)); 425 } 426 } 427 badsb(listerr, 428 "VALUES IN SUPER BLOCK DISAGREE WITH " 429 "THOSE IN FIRST ALTERNATE"); 430 return 0; 431 } 432 havesb = 1; 433 return 1; 434 } 435 436 void 437 copyback_sb(struct bufarea *bp) 438 { 439 /* Copy the in-memory superblock back to buffer */ 440 bp->b_un.b_fs->e2fs_icount = h2fs32(sblock.e2fs.e2fs_icount); 441 bp->b_un.b_fs->e2fs_bcount = h2fs32(sblock.e2fs.e2fs_bcount); 442 bp->b_un.b_fs->e2fs_rbcount = h2fs32(sblock.e2fs.e2fs_rbcount); 443 bp->b_un.b_fs->e2fs_fbcount = h2fs32(sblock.e2fs.e2fs_fbcount); 444 bp->b_un.b_fs->e2fs_ficount = h2fs32(sblock.e2fs.e2fs_ficount); 445 bp->b_un.b_fs->e2fs_first_dblock = 446 h2fs32(sblock.e2fs.e2fs_first_dblock); 447 bp->b_un.b_fs->e2fs_log_bsize = h2fs32(sblock.e2fs.e2fs_log_bsize); 448 bp->b_un.b_fs->e2fs_fsize = h2fs32(sblock.e2fs.e2fs_fsize); 449 bp->b_un.b_fs->e2fs_bpg = h2fs32(sblock.e2fs.e2fs_bpg); 450 bp->b_un.b_fs->e2fs_fpg = h2fs32(sblock.e2fs.e2fs_fpg); 451 bp->b_un.b_fs->e2fs_ipg = h2fs32(sblock.e2fs.e2fs_ipg); 452 bp->b_un.b_fs->e2fs_mtime = h2fs32(sblock.e2fs.e2fs_mtime); 453 bp->b_un.b_fs->e2fs_wtime = h2fs32(sblock.e2fs.e2fs_wtime); 454 bp->b_un.b_fs->e2fs_lastfsck = h2fs32(sblock.e2fs.e2fs_lastfsck); 455 bp->b_un.b_fs->e2fs_fsckintv = h2fs32(sblock.e2fs.e2fs_fsckintv); 456 bp->b_un.b_fs->e2fs_creator = h2fs32(sblock.e2fs.e2fs_creator); 457 bp->b_un.b_fs->e2fs_rev = h2fs32(sblock.e2fs.e2fs_rev); 458 bp->b_un.b_fs->e2fs_mnt_count = h2fs16(sblock.e2fs.e2fs_mnt_count); 459 bp->b_un.b_fs->e2fs_max_mnt_count = 460 h2fs16(sblock.e2fs.e2fs_max_mnt_count); 461 bp->b_un.b_fs->e2fs_magic = h2fs16(sblock.e2fs.e2fs_magic); 462 bp->b_un.b_fs->e2fs_state = h2fs16(sblock.e2fs.e2fs_state); 463 bp->b_un.b_fs->e2fs_beh = h2fs16(sblock.e2fs.e2fs_beh); 464 bp->b_un.b_fs->e2fs_ruid = h2fs16(sblock.e2fs.e2fs_ruid); 465 bp->b_un.b_fs->e2fs_rgid = h2fs16(sblock.e2fs.e2fs_rgid); 466 } 467 468 void 469 badsb(int listerr, const char *s) 470 { 471 472 if (!listerr) 473 return; 474 if (preen) 475 printf("%s: ", cdevname()); 476 pfatal("BAD SUPER BLOCK: %s\n", s); 477 } 478 479 /* 480 * Calculate a prototype superblock based on information in the disk label. 481 * When done the cgsblock macro can be calculated and the fs_ncg field 482 * can be used. Do NOT attempt to use other macros without verifying that 483 * their needed information is available! 484 */ 485 486 int 487 calcsb(const char *dev, int devfd, struct m_ext2fs *fs) 488 { 489 struct disklabel *lp; 490 struct partition *pp; 491 char *cp; 492 493 cp = strchr(dev, '\0'); 494 if (cp-- == dev || 495 ((*cp < 'a' || *cp > 'h') && !isdigit((unsigned char)*cp))) { 496 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 497 return 0; 498 } 499 lp = getdisklabel(dev, devfd); 500 if (isdigit((unsigned char)*cp)) 501 pp = &lp->d_partitions[0]; 502 else 503 pp = &lp->d_partitions[*cp - 'a']; 504 if (pp->p_fstype != FS_EX2FS) { 505 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 506 dev, pp->p_fstype < FSMAXTYPES ? 507 fstypenames[pp->p_fstype] : "unknown"); 508 return 0; 509 } 510 if (pp->p_fsize == 0) { 511 pfatal("%s: PARTITION SIZE IS 0\n", dev); 512 return 0; 513 } 514 memset(fs, 0, sizeof(struct m_ext2fs)); 515 fs->e2fs_bsize = pp->p_fsize; 516 fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024; 517 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 518 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 519 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 520 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 521 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 522 fs->e2fs_bmask = ~fs->e2fs_qbmask; 523 fs->e2fs_ncg = 524 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 525 fs->e2fs.e2fs_bpg); 526 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 527 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 528 fs->e2fs_bsize / sizeof(struct ext2_gd)); 529 530 return 1; 531 } 532 533 static struct disklabel * 534 getdisklabel(const char *s, int fd) 535 { 536 static struct disklabel lab; 537 538 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 539 if (s == NULL) 540 return NULL; 541 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 542 errexit("%s: can't read disk label", s); 543 } 544 return &lab; 545 } 546 547 daddr_t 548 cgoverhead(int c) 549 { 550 int overh; 551 overh = 552 1 /* block bitmap */ + 553 1 /* inode bitmap */ + 554 sblock.e2fs_itpg; 555 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 556 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 557 if (cg_has_sb(c) == 0) 558 return overh; 559 } 560 overh += 1 /* superblock */ + sblock.e2fs_ngdb; 561 return overh; 562 } 563