setup.c revision 1.11
1 /* $NetBSD: setup.c,v 1.11 2000/01/26 16:21:32 bouyer Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Manuel Bouyer. 5 * Copyright (c) 1980, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94"; 41 #else 42 __RCSID("$NetBSD: setup.c,v 1.11 2000/01/26 16:21:32 bouyer Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #define FSTYPENAMES 47 #include <sys/param.h> 48 #include <sys/time.h> 49 #include <ufs/ext2fs/ext2fs_dinode.h> 50 #include <ufs/ext2fs/ext2fs.h> 51 #include <sys/stat.h> 52 #include <sys/ioctl.h> 53 #include <sys/disklabel.h> 54 #include <sys/file.h> 55 56 #include <errno.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <ctype.h> 61 62 #include "fsck.h" 63 #include "extern.h" 64 #include "fsutil.h" 65 66 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 67 68 void badsb __P((int, char *)); 69 int calcsb __P((const char *, int, struct m_ext2fs *)); 70 static struct disklabel *getdisklabel __P((const char *, int)); 71 static int readsb __P((int)); 72 73 int 74 setup(dev) 75 const char *dev; 76 { 77 long cg, asked, i; 78 long bmapsize; 79 struct disklabel *lp; 80 off_t sizepb; 81 struct stat statb; 82 struct m_ext2fs proto; 83 int doskipclean; 84 u_int64_t maxfilesize; 85 86 havesb = 0; 87 fswritefd = -1; 88 doskipclean = skipclean; 89 if (stat(dev, &statb) < 0) { 90 printf("Can't stat %s: %s\n", dev, strerror(errno)); 91 return (0); 92 } 93 if (!S_ISCHR(statb.st_mode)) { 94 pfatal("%s is not a character device", dev); 95 if (reply("CONTINUE") == 0) 96 return (0); 97 } 98 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 99 printf("Can't open %s: %s\n", dev, strerror(errno)); 100 return (0); 101 } 102 if (preen == 0) 103 printf("** %s", dev); 104 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 105 fswritefd = -1; 106 if (preen) 107 pfatal("NO WRITE ACCESS"); 108 printf(" (NO WRITE)"); 109 } 110 if (preen == 0) 111 printf("\n"); 112 fsmodified = 0; 113 lfdir = 0; 114 initbarea(&sblk); 115 initbarea(&asblk); 116 sblk.b_un.b_buf = malloc(SBSIZE); 117 asblk.b_un.b_buf = malloc(SBSIZE); 118 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 119 errexit("cannot allocate space for superblock\n"); 120 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 121 dev_bsize = secsize = lp->d_secsize; 122 else 123 dev_bsize = secsize = DEV_BSIZE; 124 /* 125 * Read in the superblock, looking for alternates if necessary 126 */ 127 if (readsb(1) == 0) { 128 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 129 return(0); 130 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 131 return (0); 132 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 133 bflag = fsbtodb(&proto, 134 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); 135 if (readsb(0) != 0) 136 break; 137 } 138 if (cg >= proto.e2fs_ncg) { 139 printf("%s %s\n%s %s\n%s %s\n", 140 "SEARCH FOR ALTERNATE SUPER-BLOCK", 141 "FAILED. YOU MUST USE THE", 142 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 143 "LOCATION OF AN ALTERNATE", 144 "SUPER-BLOCK TO SUPPLY NEEDED", 145 "INFORMATION; SEE fsck_ext2fs(8)."); 146 return(0); 147 } 148 doskipclean = 0; 149 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 150 } 151 if (debug) 152 printf("state = %d\n", sblock.e2fs.e2fs_state); 153 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 154 if (doskipclean) { 155 pwarn("%sile system is clean; not checking\n", 156 preen ? "f" : "** F"); 157 return (-1); 158 } 159 if (!preen) 160 pwarn("** File system is already clean\n"); 161 } 162 maxfsblock = sblock.e2fs.e2fs_bcount; 163 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 164 sizepb = sblock.e2fs_bsize; 165 maxfilesize = sblock.e2fs_bsize * NDADDR - 1; 166 for (i = 0; i < NIADDR; i++) { 167 sizepb *= NINDIR(&sblock); 168 maxfilesize += sizepb; 169 } 170 /* 171 * Check and potentially fix certain fields in the super block. 172 */ 173 if ((sblock.e2fs.e2fs_rbcount < 0) || 174 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 175 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 176 sblock.e2fs.e2fs_rbcount); 177 if (reply("SET TO DEFAULT") == 1) { 178 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; 179 sbdirty(); 180 dirty(&asblk); 181 } 182 } 183 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 184 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 185 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 186 return 0; 187 } 188 if (asblk.b_dirty && !bflag) { 189 copyback_sb(&asblk); 190 flush(fswritefd, &asblk); 191 } 192 /* 193 * read in the summary info. 194 */ 195 196 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 197 if (sblock.e2fs_gd == NULL) 198 errexit("out of memory\n"); 199 asked = 0; 200 for (i=0; i < sblock.e2fs_ngdb; i++) { 201 if (bread(fsreadfd,(char *) 202 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 203 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 204 sblock.e2fs_bsize) != 0 && !asked) { 205 pfatal("BAD SUMMARY INFORMATION"); 206 if (reply("CONTINUE") == 0) 207 errexit("%s\n", ""); 208 asked++; 209 } 210 } 211 /* 212 * allocate and initialize the necessary maps 213 */ 214 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 215 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 216 if (blockmap == NULL) { 217 printf("cannot alloc %u bytes for blockmap\n", 218 (unsigned)bmapsize); 219 goto badsblabel; 220 } 221 statemap = calloc((unsigned)(maxino + 2), sizeof(char)); 222 if (statemap == NULL) { 223 printf("cannot alloc %u bytes for statemap\n", 224 (unsigned)(maxino + 1)); 225 goto badsblabel; 226 } 227 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 228 if (typemap == NULL) { 229 printf("cannot alloc %u bytes for typemap\n", 230 (unsigned)(maxino + 1)); 231 goto badsblabel; 232 } 233 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 234 if (lncntp == NULL) { 235 printf("cannot alloc %u bytes for lncntp\n", 236 (unsigned)((maxino + 1) * sizeof(int16_t))); 237 goto badsblabel; 238 } 239 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 240 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 241 } 242 inplast = 0; 243 listmax = numdirs + 10; 244 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 245 sizeof(struct inoinfo *)); 246 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 247 sizeof(struct inoinfo *)); 248 if (inpsort == NULL || inphead == NULL) { 249 printf("cannot alloc %u bytes for inphead\n", 250 (unsigned)(numdirs * sizeof(struct inoinfo *))); 251 goto badsblabel; 252 } 253 bufinit(); 254 return (1); 255 256 badsblabel: 257 ckfini(0); 258 return (0); 259 } 260 261 /* 262 * Read in the super block and its summary info, convert to host byte order. 263 */ 264 static int 265 readsb(listerr) 266 int listerr; 267 { 268 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 269 270 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 271 return (0); 272 sblk.b_bno = super; 273 sblk.b_size = SBSIZE; 274 275 /* Copy the superblock in memory */ 276 sblock.e2fs.e2fs_icount = fs2h32(sblk.b_un.b_fs->e2fs_icount); 277 sblock.e2fs.e2fs_bcount = fs2h32(sblk.b_un.b_fs->e2fs_bcount); 278 sblock.e2fs.e2fs_rbcount = fs2h32(sblk.b_un.b_fs->e2fs_rbcount); 279 sblock.e2fs.e2fs_fbcount = fs2h32(sblk.b_un.b_fs->e2fs_fbcount); 280 sblock.e2fs.e2fs_ficount = fs2h32(sblk.b_un.b_fs->e2fs_ficount); 281 sblock.e2fs.e2fs_first_dblock = fs2h32(sblk.b_un.b_fs->e2fs_first_dblock); 282 sblock.e2fs.e2fs_log_bsize = fs2h32(sblk.b_un.b_fs->e2fs_log_bsize); 283 sblock.e2fs.e2fs_fsize = fs2h32(sblk.b_un.b_fs->e2fs_fsize); 284 sblock.e2fs.e2fs_bpg = fs2h32(sblk.b_un.b_fs->e2fs_bpg); 285 sblock.e2fs.e2fs_fpg = fs2h32(sblk.b_un.b_fs->e2fs_fpg); 286 sblock.e2fs.e2fs_ipg = fs2h32(sblk.b_un.b_fs->e2fs_ipg); 287 sblock.e2fs.e2fs_mtime = fs2h32(sblk.b_un.b_fs->e2fs_mtime); 288 sblock.e2fs.e2fs_wtime = fs2h32(sblk.b_un.b_fs->e2fs_wtime); 289 sblock.e2fs.e2fs_lastfsck = fs2h32(sblk.b_un.b_fs->e2fs_lastfsck); 290 sblock.e2fs.e2fs_fsckintv = fs2h32(sblk.b_un.b_fs->e2fs_fsckintv); 291 sblock.e2fs.e2fs_creator = fs2h32(sblk.b_un.b_fs->e2fs_creator); 292 sblock.e2fs.e2fs_rev = fs2h32(sblk.b_un.b_fs->e2fs_rev); 293 sblock.e2fs.e2fs_mnt_count = fs2h16(sblk.b_un.b_fs->e2fs_mnt_count); 294 sblock.e2fs.e2fs_max_mnt_count = fs2h16(sblk.b_un.b_fs->e2fs_max_mnt_count); 295 sblock.e2fs.e2fs_magic = fs2h16(sblk.b_un.b_fs->e2fs_magic); 296 sblock.e2fs.e2fs_state = fs2h16(sblk.b_un.b_fs->e2fs_state); 297 sblock.e2fs.e2fs_beh = fs2h16(sblk.b_un.b_fs->e2fs_beh); 298 sblock.e2fs.e2fs_ruid = fs2h16(sblk.b_un.b_fs->e2fs_ruid); 299 sblock.e2fs.e2fs_rgid = fs2h16(sblk.b_un.b_fs->e2fs_rgid); 300 301 /* 302 * run a few consistency checks of the super block 303 */ 304 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 305 badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 306 } 307 if (sblock.e2fs.e2fs_log_bsize > 2) { 308 badsb(listerr, "BAD LOG_BSIZE"); return (0); 309 } 310 311 /* compute the dynamic fields of the in-memory sb */ 312 /* compute dynamic sb infos */ 313 sblock.e2fs_ncg = 314 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 315 sblock.e2fs.e2fs_bpg); 316 /* XXX assume hw bsize = 512 */ 317 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 318 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 319 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 320 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 321 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 322 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 323 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 324 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 325 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 326 327 cgoverhead = 1 /* super block */ + 328 sblock.e2fs_ngdb + 329 1 /* block bitmap */ + 330 1 /* inode bitmap */ + 331 sblock.e2fs_itpg; 332 333 if (debug) /* DDD */ 334 printf("cg overhead %d blocks \n", cgoverhead); 335 /* 336 * Compute block size that the filesystem is based on, 337 * according to fsbtodb, and adjust superblock block number 338 * so we can tell if this is an alternate later. 339 */ 340 super *= dev_bsize; 341 dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1); 342 sblk.b_bno = super / dev_bsize; 343 344 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 345 (long)SBSIZE); 346 if (asblk.b_errs) 347 return (0); 348 if (bflag) { 349 havesb = 1; 350 return (1); 351 } 352 353 /* 354 * Set all possible fields that could differ, then do check 355 * of whole super block against an alternate super block. 356 * When an alternate super-block is specified this check is skipped. 357 */ 358 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 359 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 360 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 361 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 362 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 363 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 364 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 365 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 366 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 367 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 368 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 369 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 370 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 371 asblk.b_un.b_fs->e2fs_block_group_nr = 372 sblk.b_un.b_fs->e2fs_block_group_nr; 373 if (sblk.b_un.b_fs->e2fs_rev > E2FS_REV0 && 374 ((sblk.b_un.b_fs->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || 375 (sblk.b_un.b_fs->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { 376 if (debug) { 377 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 378 "0x%08x\n", 379 sblk.b_un.b_fs->e2fs_features_compat, 380 sblk.b_un.b_fs->e2fs_features_incompat, 381 sblk.b_un.b_fs->e2fs_features_rocompat); 382 } 383 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 384 return 0; 385 } 386 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 387 if (debug) { 388 u_int32_t *nlp, *olp, *endlp; 389 390 printf("superblock mismatches\n"); 391 nlp = (u_int32_t *)asblk.b_un.b_fs; 392 olp = (u_int32_t *)sblk.b_un.b_fs; 393 endlp = olp + (SBSIZE / sizeof *olp); 394 for ( ; olp < endlp; olp++, nlp++) { 395 if (*olp == *nlp) 396 continue; 397 printf("offset %ld, original %ld, alternate %ld\n", 398 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 399 (long)fs2h32(*olp), 400 (long)fs2h32(*nlp)); 401 } 402 } 403 badsb(listerr, 404 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 405 return (0); 406 } 407 havesb = 1; 408 return (1); 409 } 410 411 void 412 copyback_sb(bp) 413 struct bufarea *bp; 414 { 415 /* Copy the in-memory superblock back to buffer */ 416 bp->b_un.b_fs->e2fs_icount = fs2h32(sblock.e2fs.e2fs_icount); 417 bp->b_un.b_fs->e2fs_bcount = fs2h32(sblock.e2fs.e2fs_bcount); 418 bp->b_un.b_fs->e2fs_rbcount = fs2h32(sblock.e2fs.e2fs_rbcount); 419 bp->b_un.b_fs->e2fs_fbcount = fs2h32(sblock.e2fs.e2fs_fbcount); 420 bp->b_un.b_fs->e2fs_ficount = fs2h32(sblock.e2fs.e2fs_ficount); 421 bp->b_un.b_fs->e2fs_first_dblock = 422 fs2h32(sblock.e2fs.e2fs_first_dblock); 423 bp->b_un.b_fs->e2fs_log_bsize = fs2h32(sblock.e2fs.e2fs_log_bsize); 424 bp->b_un.b_fs->e2fs_fsize = fs2h32(sblock.e2fs.e2fs_fsize); 425 bp->b_un.b_fs->e2fs_bpg = fs2h32(sblock.e2fs.e2fs_bpg); 426 bp->b_un.b_fs->e2fs_fpg = fs2h32(sblock.e2fs.e2fs_fpg); 427 bp->b_un.b_fs->e2fs_ipg = fs2h32(sblock.e2fs.e2fs_ipg); 428 bp->b_un.b_fs->e2fs_mtime = fs2h32(sblock.e2fs.e2fs_mtime); 429 bp->b_un.b_fs->e2fs_wtime = fs2h32(sblock.e2fs.e2fs_wtime); 430 bp->b_un.b_fs->e2fs_lastfsck = fs2h32(sblock.e2fs.e2fs_lastfsck); 431 bp->b_un.b_fs->e2fs_fsckintv = fs2h32(sblock.e2fs.e2fs_fsckintv); 432 bp->b_un.b_fs->e2fs_creator = fs2h32(sblock.e2fs.e2fs_creator); 433 bp->b_un.b_fs->e2fs_rev = fs2h32(sblock.e2fs.e2fs_rev); 434 bp->b_un.b_fs->e2fs_mnt_count = fs2h16(sblock.e2fs.e2fs_mnt_count); 435 bp->b_un.b_fs->e2fs_max_mnt_count = 436 fs2h16(sblock.e2fs.e2fs_max_mnt_count); 437 bp->b_un.b_fs->e2fs_magic = fs2h16(sblock.e2fs.e2fs_magic); 438 bp->b_un.b_fs->e2fs_state = fs2h16(sblock.e2fs.e2fs_state); 439 bp->b_un.b_fs->e2fs_beh = fs2h16(sblock.e2fs.e2fs_beh); 440 bp->b_un.b_fs->e2fs_ruid = fs2h16(sblock.e2fs.e2fs_ruid); 441 bp->b_un.b_fs->e2fs_rgid = fs2h16(sblock.e2fs.e2fs_rgid); 442 } 443 444 void 445 badsb(listerr, s) 446 int listerr; 447 char *s; 448 { 449 450 if (!listerr) 451 return; 452 if (preen) 453 printf("%s: ", cdevname()); 454 pfatal("BAD SUPER BLOCK: %s\n", s); 455 } 456 457 /* 458 * Calculate a prototype superblock based on information in the disk label. 459 * When done the cgsblock macro can be calculated and the fs_ncg field 460 * can be used. Do NOT attempt to use other macros without verifying that 461 * their needed information is available! 462 */ 463 464 int 465 calcsb(dev, devfd, fs) 466 const char *dev; 467 int devfd; 468 struct m_ext2fs *fs; 469 { 470 struct disklabel *lp; 471 struct partition *pp; 472 char *cp; 473 474 cp = strchr(dev, '\0') - 1; 475 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 476 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 477 return (0); 478 } 479 lp = getdisklabel(dev, devfd); 480 if (isdigit(*cp)) 481 pp = &lp->d_partitions[0]; 482 else 483 pp = &lp->d_partitions[*cp - 'a']; 484 if (pp->p_fstype != FS_EX2FS) { 485 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 486 dev, pp->p_fstype < FSMAXTYPES ? 487 fstypenames[pp->p_fstype] : "unknown"); 488 return (0); 489 } 490 memset(fs, 0, sizeof(struct m_ext2fs)); 491 fs->e2fs_bsize = pp->p_fsize; 492 fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024; 493 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 494 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 495 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 496 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 497 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 498 fs->e2fs_bmask = ~fs->e2fs_qbmask; 499 fs->e2fs_ncg = 500 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 501 fs->e2fs.e2fs_bpg); 502 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 503 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 504 fs->e2fs_bsize / sizeof(struct ext2_gd)); 505 506 return (1); 507 } 508 509 static struct disklabel * 510 getdisklabel(s, fd) 511 const char *s; 512 int fd; 513 { 514 static struct disklabel lab; 515 516 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 517 if (s == NULL) 518 return ((struct disklabel *)NULL); 519 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 520 errexit("%s: can't read disk label\n", s); 521 } 522 return (&lab); 523 } 524
Indexes created Thu Oct 23 22:10:10 GMT 2025