1 /* $NetBSD: setup.c,v 1.39 2019/03/31 13:16:52 mlelstv 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 1.39 2019/03/31 13:16:52 mlelstv Exp $"); 62 #endif 63 #endif /* not lint */ 64 65 #define FSTYPENAMES 66 #include <sys/param.h> 67 #include <sys/time.h> 68 #include <sys/bitops.h> 69 #include <ufs/ext2fs/ext2fs_dinode.h> 70 #include <ufs/ext2fs/ext2fs.h> 71 #include <sys/stat.h> 72 #include <sys/ioctl.h> 73 #include <sys/disk.h> 74 #include <sys/file.h> 75 76 #include <errno.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <ctype.h> 81 82 #include <util.h> 83 84 #include "fsck.h" 85 #include "extern.h" 86 #include "fsutil.h" 87 #include "partutil.h" 88 #include "exitvalues.h" 89 90 void badsb(int, const char *); 91 int calcsb(const char *, int, struct m_ext2fs *); 92 static int readsb(int); 93 94 /* 95 * For file systems smaller than SMALL_FSSIZE we use the S_DFL_* defaults, 96 * otherwise if less than MEDIUM_FSSIZE use M_DFL_*, otherwise use 97 * L_DFL_*. 98 */ 99 #define SMALL_FSSIZE ((4 * 1024 * 1024) / secsize) /* 4MB */ 100 #define S_DFL_BSIZE 1024 101 #define MEDIUM_FSSIZE ((512 * 1024 * 1024) / secsize) /* 512MB */ 102 #define M_DFL_BSIZE 1024 103 #define L_DFL_BSIZE 4096 104 105 int 106 setup(const char *dev) 107 { 108 long cg, asked, i; 109 long bmapsize; 110 struct disk_geom geo; 111 struct dkwedge_info dkw; 112 off_t sizepb; 113 struct stat statb; 114 struct m_ext2fs proto; 115 int doskipclean; 116 u_int64_t maxfilesize; 117 118 havesb = 0; 119 fswritefd = -1; 120 doskipclean = skipclean; 121 if (stat(dev, &statb) < 0) { 122 printf("Can't stat %s: %s\n", dev, strerror(errno)); 123 return 0; 124 } 125 if (!S_ISCHR(statb.st_mode)) { 126 pfatal("%s is not a character device", dev); 127 if (reply("CONTINUE") == 0) 128 return 0; 129 } 130 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 131 printf("Can't open %s: %s\n", dev, strerror(errno)); 132 return 0; 133 } 134 if (preen == 0) 135 printf("** %s", dev); 136 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 137 fswritefd = -1; 138 if (preen) 139 pfatal("NO WRITE ACCESS"); 140 printf(" (NO WRITE)"); 141 } 142 if (preen == 0) 143 printf("\n"); 144 fsmodified = 0; 145 lfdir = 0; 146 initbarea(&sblk); 147 initbarea(&asblk); 148 sblk.b_un.b_buf = malloc(SBSIZE); 149 asblk.b_un.b_buf = malloc(SBSIZE); 150 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 151 errexit("cannot allocate space for superblock"); 152 if (getdiskinfo(dev, fsreadfd, NULL, &geo, &dkw) != -1) 153 dev_bsize = secsize = geo.dg_secsize; 154 else 155 dev_bsize = secsize = DEV_BSIZE; 156 /* 157 * Read in the superblock, looking for alternates if necessary 158 */ 159 if (readsb(1) == 0) { 160 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 161 return 0; 162 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 163 return 0; 164 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 165 bflag = EXT2_FSBTODB(&proto, 166 cg * proto.e2fs.e2fs_bpg + 167 proto.e2fs.e2fs_first_dblock); 168 if (readsb(0) != 0) 169 break; 170 } 171 if (cg >= proto.e2fs_ncg) { 172 printf("%s %s\n%s %s\n%s %s\n", 173 "SEARCH FOR ALTERNATE SUPER-BLOCK", 174 "FAILED. YOU MUST USE THE", 175 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 176 "LOCATION OF AN ALTERNATE", 177 "SUPER-BLOCK TO SUPPLY NEEDED", 178 "INFORMATION; SEE fsck_ext2fs(8)."); 179 return 0; 180 } 181 doskipclean = 0; 182 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 183 } 184 if (debug) 185 printf("state = %d\n", sblock.e2fs.e2fs_state); 186 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 187 if (doskipclean) { 188 pwarn("%sile system is clean; not checking\n", 189 preen ? "f" : "** F"); 190 return -1; 191 } 192 if (!preen) 193 pwarn("** File system is already clean\n"); 194 } 195 maxfsblock = sblock.e2fs.e2fs_bcount; 196 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 197 sizepb = sblock.e2fs_bsize; 198 maxfilesize = sblock.e2fs_bsize * EXT2FS_NDADDR - 1; 199 for (i = 0; i < EXT2FS_NIADDR; i++) { 200 sizepb *= EXT2_NINDIR(&sblock); 201 maxfilesize += sizepb; 202 } 203 /* 204 * Check and potentially fix certain fields in the super block. 205 */ 206 if (/* (sblock.e2fs.e2fs_rbcount < 0) || */ 207 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 208 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 209 sblock.e2fs.e2fs_rbcount); 210 if (reply("SET TO DEFAULT") == 1) { 211 sblock.e2fs.e2fs_rbcount = 212 sblock.e2fs.e2fs_bcount * MINFREE / 100; 213 sbdirty(); 214 dirty(&asblk); 215 } 216 } 217 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 218 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 219 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 220 return 0; 221 } 222 if (asblk.b_dirty && !bflag) { 223 copyback_sb(&asblk); 224 flush(fswritefd, &asblk); 225 } 226 /* 227 * read in the summary info. 228 */ 229 230 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 231 if (sblock.e2fs_gd == NULL) 232 errexit("out of memory"); 233 asked = 0; 234 for (i = 0; i < sblock.e2fs_ngdb; i++) { 235 if (bread(fsreadfd, 236 (char *)&sblock.e2fs_gd[i * sblock.e2fs_bsize / 237 sizeof(struct ext2_gd)], 238 EXT2_FSBTODB(&sblock, ((sblock.e2fs_bsize > 1024) ? 0 : 1) + 239 i + 1), 240 sblock.e2fs_bsize) != 0 && !asked) { 241 pfatal("BAD SUMMARY INFORMATION"); 242 if (reply("CONTINUE") == 0) 243 exit(FSCK_EXIT_CHECK_FAILED); 244 asked++; 245 } 246 } 247 /* 248 * allocate and initialize the necessary maps 249 */ 250 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 251 blockmap = calloc((unsigned int)bmapsize, sizeof(char)); 252 if (blockmap == NULL) { 253 printf("cannot alloc %u bytes for blockmap\n", 254 (unsigned int)bmapsize); 255 goto badsblabel; 256 } 257 statemap = calloc((unsigned int)(maxino + 2), sizeof(char)); 258 if (statemap == NULL) { 259 printf("cannot alloc %u bytes for statemap\n", 260 (unsigned int)(maxino + 1)); 261 goto badsblabel; 262 } 263 typemap = calloc((unsigned int)(maxino + 1), sizeof(char)); 264 if (typemap == NULL) { 265 printf("cannot alloc %u bytes for typemap\n", 266 (unsigned int)(maxino + 1)); 267 goto badsblabel; 268 } 269 lncntp = calloc((unsigned)(maxino + 1), sizeof(int16_t)); 270 if (lncntp == NULL) { 271 printf("cannot alloc %u bytes for lncntp\n", 272 (unsigned int)((maxino + 1) * sizeof(int16_t))); 273 goto badsblabel; 274 } 275 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 276 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 277 } 278 inplast = 0; 279 listmax = numdirs + 10; 280 inpsort = calloc((unsigned int)listmax, sizeof(struct inoinfo *)); 281 inphead = calloc((unsigned int)numdirs, sizeof(struct inoinfo *)); 282 if (inpsort == NULL || inphead == NULL) { 283 printf("cannot alloc %u bytes for inphead\n", 284 (unsigned int)(numdirs * sizeof(struct inoinfo *))); 285 goto badsblabel; 286 } 287 bufinit(); 288 return 1; 289 290 badsblabel: 291 ckfini(0); 292 return 0; 293 } 294 295 /* 296 * Read in the super block and its summary info, convert to host byte order. 297 */ 298 static int 299 readsb(int listerr) 300 { 301 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 302 303 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 304 return 0; 305 sblk.b_bno = super; 306 sblk.b_size = SBSIZE; 307 308 /* Copy the superblock in memory */ 309 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 310 311 /* 312 * run a few consistency checks of the super block 313 */ 314 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 315 badsb(listerr, "MAGIC NUMBER WRONG"); 316 return 0; 317 } 318 if (sblock.e2fs.e2fs_log_bsize > 2) { 319 badsb(listerr, "BAD LOG_BSIZE"); 320 return 0; 321 } 322 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 323 (!powerof2(sblock.e2fs.e2fs_inode_size) || 324 sblock.e2fs.e2fs_inode_size < EXT2_REV0_DINODE_SIZE || 325 sblock.e2fs.e2fs_inode_size > 326 (1024 << sblock.e2fs.e2fs_log_bsize))) { 327 badsb(listerr, "BAD INODE_SIZE"); 328 return 0; 329 } 330 331 /* compute the dynamic fields of the in-memory sb */ 332 /* compute dynamic sb infos */ 333 sblock.e2fs_ncg = 334 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 335 sblock.e2fs.e2fs_bpg); 336 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + ilog2(1024 / dev_bsize); 337 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 338 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 339 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 340 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 341 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 342 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 343 sblock.e2fs_ipb = sblock.e2fs_bsize / EXT2_DINODE_SIZE(&sblock); 344 sblock.e2fs_itpg = howmany(sblock.e2fs.e2fs_ipg, sblock.e2fs_ipb); 345 346 /* 347 * Compute block size that the filesystem is based on, 348 * according to fsbtodb, and adjust superblock block number 349 * so we can tell if this is an alternate later. 350 */ 351 super *= dev_bsize; 352 dev_bsize = sblock.e2fs_bsize / EXT2_FSBTODB(&sblock, 1); 353 sblk.b_bno = super / dev_bsize; 354 355 if (sblock.e2fs_ncg == 1) { 356 /* no alternate superblock; assume it's okay */ 357 havesb = 1; 358 return 1; 359 } 360 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 361 (long)SBSIZE); 362 if (asblk.b_errs) 363 return 0; 364 if (bflag) { 365 havesb = 1; 366 return 1; 367 } 368 369 /* 370 * Set all possible fields that could differ, then do check 371 * of whole super block against an alternate super block. 372 * When an alternate super-block is specified this check is skipped. 373 */ 374 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 375 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 376 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 377 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 378 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 379 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 380 asblk.b_un.b_fs->e2fs_max_mnt_count = 381 sblk.b_un.b_fs->e2fs_max_mnt_count; 382 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 383 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 384 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 385 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 386 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 387 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 388 asblk.b_un.b_fs->e2fs_block_group_nr = 389 sblk.b_un.b_fs->e2fs_block_group_nr; 390 asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE; 391 asblk.b_un.b_fs->e2fs_features_rocompat |= 392 sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE; 393 memcpy(asblk.b_un.b_fs->e2fs_fsmnt, sblk.b_un.b_fs->e2fs_fsmnt, 394 sizeof(asblk.b_un.b_fs->e2fs_fsmnt)); 395 asblk.b_un.b_fs->e4fs_kbytes_written = 396 sblk.b_un.b_fs->e4fs_kbytes_written; 397 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 398 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP_FSCK) || 399 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP_FSCK))) { 400 if (debug) { 401 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 402 "0x%08x\n", 403 sblock.e2fs.e2fs_features_compat, 404 sblock.e2fs.e2fs_features_incompat, 405 sblock.e2fs.e2fs_features_rocompat); 406 407 if ((sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP_FSCK)) { 408 char buf[512]; 409 410 snprintb(buf, sizeof(buf), EXT2F_ROCOMPAT_BITS, 411 sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP_FSCK); 412 printf("unsupported rocompat features: %s\n", buf); 413 } 414 if ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP_FSCK)) { 415 char buf[512]; 416 417 snprintb(buf, sizeof(buf), EXT2F_INCOMPAT_BITS, 418 sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP_FSCK); 419 printf("unsupported incompat features: %s\n", buf); 420 } 421 } 422 badsb(listerr, "INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 423 return 0; 424 } 425 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 426 if (debug) { 427 u_int32_t *nlp, *olp, *endlp; 428 429 printf("superblock mismatches\n"); 430 nlp = (u_int32_t *)asblk.b_un.b_fs; 431 olp = (u_int32_t *)sblk.b_un.b_fs; 432 endlp = olp + (SBSIZE / sizeof(*olp)); 433 for ( ; olp < endlp; olp++, nlp++) { 434 if (*olp == *nlp) 435 continue; 436 printf("offset %ld, original %ld, " 437 "alternate %ld\n", 438 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 439 (long)fs2h32(*olp), 440 (long)fs2h32(*nlp)); 441 } 442 } 443 badsb(listerr, 444 "VALUES IN SUPER BLOCK DISAGREE WITH " 445 "THOSE IN FIRST ALTERNATE"); 446 return 0; 447 } 448 havesb = 1; 449 return 1; 450 } 451 452 void 453 copyback_sb(struct bufarea *bp) 454 { 455 /* Copy the in-memory superblock back to buffer */ 456 bp->b_un.b_fs->e2fs_icount = h2fs32(sblock.e2fs.e2fs_icount); 457 bp->b_un.b_fs->e2fs_bcount = h2fs32(sblock.e2fs.e2fs_bcount); 458 bp->b_un.b_fs->e2fs_rbcount = h2fs32(sblock.e2fs.e2fs_rbcount); 459 bp->b_un.b_fs->e2fs_fbcount = h2fs32(sblock.e2fs.e2fs_fbcount); 460 bp->b_un.b_fs->e2fs_ficount = h2fs32(sblock.e2fs.e2fs_ficount); 461 bp->b_un.b_fs->e2fs_first_dblock = 462 h2fs32(sblock.e2fs.e2fs_first_dblock); 463 bp->b_un.b_fs->e2fs_log_bsize = h2fs32(sblock.e2fs.e2fs_log_bsize); 464 bp->b_un.b_fs->e2fs_fsize = h2fs32(sblock.e2fs.e2fs_fsize); 465 bp->b_un.b_fs->e2fs_bpg = h2fs32(sblock.e2fs.e2fs_bpg); 466 bp->b_un.b_fs->e2fs_fpg = h2fs32(sblock.e2fs.e2fs_fpg); 467 bp->b_un.b_fs->e2fs_ipg = h2fs32(sblock.e2fs.e2fs_ipg); 468 bp->b_un.b_fs->e2fs_mtime = h2fs32(sblock.e2fs.e2fs_mtime); 469 bp->b_un.b_fs->e2fs_wtime = h2fs32(sblock.e2fs.e2fs_wtime); 470 bp->b_un.b_fs->e2fs_lastfsck = h2fs32(sblock.e2fs.e2fs_lastfsck); 471 bp->b_un.b_fs->e2fs_fsckintv = h2fs32(sblock.e2fs.e2fs_fsckintv); 472 bp->b_un.b_fs->e2fs_creator = h2fs32(sblock.e2fs.e2fs_creator); 473 bp->b_un.b_fs->e2fs_rev = h2fs32(sblock.e2fs.e2fs_rev); 474 bp->b_un.b_fs->e2fs_mnt_count = h2fs16(sblock.e2fs.e2fs_mnt_count); 475 bp->b_un.b_fs->e2fs_max_mnt_count = 476 h2fs16(sblock.e2fs.e2fs_max_mnt_count); 477 bp->b_un.b_fs->e2fs_magic = h2fs16(sblock.e2fs.e2fs_magic); 478 bp->b_un.b_fs->e2fs_state = h2fs16(sblock.e2fs.e2fs_state); 479 bp->b_un.b_fs->e2fs_beh = h2fs16(sblock.e2fs.e2fs_beh); 480 bp->b_un.b_fs->e2fs_ruid = h2fs16(sblock.e2fs.e2fs_ruid); 481 bp->b_un.b_fs->e2fs_rgid = h2fs16(sblock.e2fs.e2fs_rgid); 482 } 483 484 void 485 badsb(int listerr, const char *s) 486 { 487 488 if (!listerr) 489 return; 490 if (preen) 491 printf("%s: ", cdevname()); 492 pfatal("BAD SUPER BLOCK: %s\n", s); 493 } 494 495 /* 496 * Calculate a prototype superblock based on information in the disk label. 497 * When done the cgsblock macro can be calculated and the fs_ncg field 498 * can be used. Do NOT attempt to use other macros without verifying that 499 * their needed information is available! 500 */ 501 502 int 503 calcsb(const char *dev, int devfd, struct m_ext2fs *fs) 504 { 505 struct dkwedge_info dkw; 506 struct disk_geom geo; 507 508 if (getdiskinfo(dev, devfd, NULL, &geo, &dkw) == -1) 509 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 510 if (dkw.dkw_parent[0] == '\0') { 511 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 512 return 0; 513 } 514 515 memset(fs, 0, sizeof(struct m_ext2fs)); 516 517 if (dkw.dkw_size < (uint64_t)SMALL_FSSIZE) 518 fs->e2fs_bsize = S_DFL_BSIZE; 519 else if (dkw.dkw_size < (uint64_t)MEDIUM_FSSIZE) 520 fs->e2fs_bsize = M_DFL_BSIZE; 521 else 522 fs->e2fs_bsize = L_DFL_BSIZE; 523 524 fs->e2fs.e2fs_log_bsize = ilog2(fs->e2fs_bsize / 1024); 525 fs->e2fs.e2fs_bcount = (fs->e2fs_bsize * DEV_BSIZE) / fs->e2fs_bsize; 526 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 527 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 528 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 529 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 530 fs->e2fs_bmask = ~fs->e2fs_qbmask; 531 fs->e2fs_ncg = 532 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 533 fs->e2fs.e2fs_bpg); 534 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 535 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 536 fs->e2fs_bsize / sizeof(struct ext2_gd)); 537 538 return 1; 539 } 540 541 daddr_t 542 cgoverhead(int c) 543 { 544 int overh; 545 overh = 546 1 /* block bitmap */ + 547 1 /* inode bitmap */ + 548 sblock.e2fs_itpg; 549 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 550 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 551 if (cg_has_sb(c) == 0) 552 return overh; 553 } 554 overh += 1 /* superblock */ + sblock.e2fs_ngdb; 555 return overh; 556 } 557
Indexes created Mon Sep 22 13:09:51 GMT 2025