1 /* $OpenBSD: setup.c,v 1.6 2000/04/26 23:26:06 jasoni Exp $ */ 2 /* $NetBSD: setup.c,v 1.1 1997/06/11 11:22:01 bouyer Exp $ */ 3 4 /* 5 * Copyright (c) 1997 Manuel Bouyer. 6 * Copyright (c) 1980, 1986, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94"; 41 #else 42 #if 0 43 static char rcsid[] = "$NetBSD: setup.c,v 1.1 1997/06/11 11:22:01 bouyer Exp $"; 44 #else 45 static char rcsid[] = "$OpenBSD: setup.c,v 1.6 2000/04/26 23:26:06 jasoni Exp $"; 46 #endif 47 #endif 48 #endif /* not lint */ 49 50 #define DKTYPENAMES 51 #include <sys/param.h> 52 #include <sys/time.h> 53 #include <ufs/ext2fs/ext2fs_dinode.h> 54 #include <ufs/ext2fs/ext2fs.h> 55 #include <sys/stat.h> 56 #include <sys/ioctl.h> 57 #include <sys/disklabel.h> 58 #include <sys/file.h> 59 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <ctype.h> 66 67 #include "fsck.h" 68 #include "extern.h" 69 #include "fsutil.h" 70 71 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 72 73 void badsb __P((int, char *)); 74 int calcsb __P((char *, int, struct m_ext2fs *)); 75 static struct disklabel *getdisklabel __P((char *, int)); 76 static int readsb __P((int)); 77 78 int 79 setup(dev) 80 char *dev; 81 { 82 long cg, asked, i; 83 long bmapsize; 84 struct disklabel *lp; 85 off_t sizepb; 86 struct stat statb; 87 struct m_ext2fs proto; 88 int doskipclean; 89 u_int64_t maxfilesize; 90 91 havesb = 0; 92 fswritefd = -1; 93 doskipclean = skipclean; 94 if (stat(dev, &statb) < 0) { 95 printf("Can't stat %s: %s\n", dev, strerror(errno)); 96 return (0); 97 } 98 if (!S_ISCHR(statb.st_mode)) { 99 pfatal("%s is not a character device", dev); 100 if (reply("CONTINUE") == 0) 101 return (0); 102 } 103 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 104 printf("Can't open %s: %s\n", dev, strerror(errno)); 105 return (0); 106 } 107 if (preen == 0) 108 printf("** %s", dev); 109 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 110 fswritefd = -1; 111 if (preen) 112 pfatal("NO WRITE ACCESS"); 113 printf(" (NO WRITE)"); 114 } 115 if (preen == 0) 116 printf("\n"); 117 fsmodified = 0; 118 lfdir = 0; 119 initbarea(&sblk); 120 initbarea(&asblk); 121 sblk.b_un.b_buf = malloc(SBSIZE); 122 asblk.b_un.b_buf = malloc(SBSIZE); 123 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 124 errexit("cannot allocate space for superblock\n"); 125 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 126 dev_bsize = secsize = lp->d_secsize; 127 else 128 dev_bsize = secsize = DEV_BSIZE; 129 /* 130 * Read in the superblock, looking for alternates if necessary 131 */ 132 if (readsb(1) == 0) { 133 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 134 return(0); 135 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 136 return (0); 137 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 138 bflag = fsbtodb(&proto, 139 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); 140 if (readsb(0) != 0) 141 break; 142 } 143 if (cg >= proto.e2fs_ncg) { 144 printf("%s %s\n%s %s\n%s %s\n", 145 "SEARCH FOR ALTERNATE SUPER-BLOCK", 146 "FAILED. YOU MUST USE THE", 147 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 148 "LOCATION OF AN ALTERNATE", 149 "SUPER-BLOCK TO SUPPLY NEEDED", 150 "INFORMATION; SEE fsck_ext2fs(8)."); 151 return(0); 152 } 153 doskipclean = 0; 154 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 155 } 156 if (debug) 157 printf("state = %d\n", sblock.e2fs.e2fs_state); 158 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 159 if (doskipclean) { 160 pwarn("%sile system is clean; not checking\n", 161 preen ? "f" : "** F"); 162 return (-1); 163 } 164 if (!preen) 165 pwarn("** File system is already clean\n"); 166 } 167 maxfsblock = sblock.e2fs.e2fs_bcount; 168 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 169 sizepb = sblock.e2fs_bsize; 170 maxfilesize = sblock.e2fs_bsize * NDADDR - 1; 171 for (i = 0; i < NIADDR; i++) { 172 sizepb *= NINDIR(&sblock); 173 maxfilesize += sizepb; 174 } 175 /* 176 * Check and potentially fix certain fields in the super block. 177 */ 178 if ((sblock.e2fs.e2fs_rbcount < 0) || 179 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 180 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 181 sblock.e2fs.e2fs_rbcount); 182 if (reply("SET TO DEFAULT") == 1) { 183 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; 184 sbdirty(); 185 dirty(&asblk); 186 } 187 } 188 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 189 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 190 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 191 return 0; 192 } 193 if (asblk.b_dirty && !bflag) { 194 copyback_sb(&asblk); 195 flush(fswritefd, &asblk); 196 } 197 /* 198 * read in the summary info. 199 */ 200 201 sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize); 202 if (sblock.e2fs_gd == NULL) 203 errexit("out of memory\n"); 204 asked = 0; 205 for (i=0; i < sblock.e2fs_ngdb; i++) { 206 if (bread(fsreadfd,(char *) 207 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 208 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 209 sblock.e2fs_bsize) != 0 && !asked) { 210 pfatal("BAD SUMMARY INFORMATION"); 211 if (reply("CONTINUE") == 0) 212 errexit("%s\n", ""); 213 asked++; 214 } 215 } 216 /* 217 * allocate and initialize the necessary maps 218 */ 219 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 220 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 221 if (blockmap == NULL) { 222 printf("cannot alloc %u bytes for blockmap\n", 223 (unsigned)bmapsize); 224 goto badsblabel; 225 } 226 statemap = calloc((unsigned)(maxino + 2), sizeof(char)); 227 if (statemap == NULL) { 228 printf("cannot alloc %u bytes for statemap\n", 229 (unsigned)(maxino + 1)); 230 goto badsblabel; 231 } 232 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 233 if (typemap == NULL) { 234 printf("cannot alloc %u bytes for typemap\n", 235 (unsigned)(maxino + 1)); 236 goto badsblabel; 237 } 238 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 239 if (lncntp == NULL) { 240 printf("cannot alloc %u bytes for lncntp\n", 241 (unsigned)((maxino + 1) * sizeof(int16_t))); 242 goto badsblabel; 243 } 244 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 245 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 246 } 247 inplast = 0; 248 listmax = numdirs + 10; 249 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 250 sizeof(struct inoinfo *)); 251 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 252 sizeof(struct inoinfo *)); 253 if (inpsort == NULL || inphead == NULL) { 254 printf("cannot alloc %u bytes for inphead\n", 255 (unsigned)(numdirs * sizeof(struct inoinfo *))); 256 goto badsblabel; 257 } 258 bufinit(); 259 return (1); 260 261 badsblabel: 262 ckfini(0); 263 return (0); 264 } 265 266 /* 267 * Read in the super block and its summary info. 268 */ 269 static int 270 readsb(listerr) 271 int listerr; 272 { 273 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 274 275 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 276 return (0); 277 sblk.b_bno = super; 278 sblk.b_size = SBSIZE; 279 280 /* Copy the superblock in memory */ 281 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 282 283 /* 284 * run a few consistency checks of the super block 285 */ 286 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 287 badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 288 } 289 if (sblock.e2fs.e2fs_log_bsize > 2) { 290 badsb(listerr, "BAD LOG_BSIZE"); return (0); 291 } 292 293 /* compute the dynamic fields of the in-memory sb */ 294 /* compute dynamic sb infos */ 295 sblock.e2fs_ncg = 296 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 297 sblock.e2fs.e2fs_bpg); 298 /* XXX assume hw bsize = 512 */ 299 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 300 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 301 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 302 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 303 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 304 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 305 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 306 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 307 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 308 309 /* 310 * Compute block size that the filesystem is based on, 311 * according to fsbtodb, and adjust superblock block number 312 * so we can tell if this is an alternate later. 313 */ 314 super *= dev_bsize; 315 dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1); 316 sblk.b_bno = super / dev_bsize; 317 318 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 319 (long)SBSIZE); 320 if (asblk.b_errs) 321 return (0); 322 if (bflag) { 323 havesb = 1; 324 return (1); 325 } 326 327 /* 328 * Set all possible fields that could differ, then do check 329 * of whole super block against an alternate super block. 330 * When an alternate super-block is specified this check is skipped. 331 */ 332 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 333 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 334 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 335 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 336 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 337 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 338 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 339 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 340 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 341 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 342 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 343 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 344 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 345 asblk.b_un.b_fs->e2fs_block_group_nr = 346 sblk.b_un.b_fs->e2fs_block_group_nr; 347 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 348 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || 349 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { 350 if (debug) { 351 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 352 "0x%08x\n", 353 sblock.e2fs.e2fs_features_compat, 354 sblock.e2fs.e2fs_features_incompat, 355 sblock.e2fs.e2fs_features_rocompat); 356 } 357 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 358 return 0; 359 } 360 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 361 if (debug) { 362 u_int32_t *nlp, *olp, *endlp; 363 364 printf("superblock mismatches\n"); 365 nlp = (u_int32_t *)asblk.b_un.b_fs; 366 olp = (u_int32_t *)sblk.b_un.b_fs; 367 endlp = olp + (SBSIZE / sizeof *olp); 368 for ( ; olp < endlp; olp++, nlp++) { 369 if (*olp == *nlp) 370 continue; 371 printf("offset %ld, original %ld, alternate %ld\n", 372 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 373 (long)fs2h32(*olp), 374 (long)fs2h32(*nlp)); 375 } 376 } 377 badsb(listerr, 378 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 379 return (0); 380 } 381 havesb = 1; 382 return (1); 383 } 384 385 void 386 copyback_sb(bp) 387 struct bufarea *bp; 388 { 389 /* Copy the in-memory superblock back to buffer */ 390 bp->b_un.b_fs->e2fs_icount = fs2h32(sblock.e2fs.e2fs_icount); 391 bp->b_un.b_fs->e2fs_bcount = fs2h32(sblock.e2fs.e2fs_bcount); 392 bp->b_un.b_fs->e2fs_rbcount = fs2h32(sblock.e2fs.e2fs_rbcount); 393 bp->b_un.b_fs->e2fs_fbcount = fs2h32(sblock.e2fs.e2fs_fbcount); 394 bp->b_un.b_fs->e2fs_ficount = fs2h32(sblock.e2fs.e2fs_ficount); 395 bp->b_un.b_fs->e2fs_first_dblock = 396 fs2h32(sblock.e2fs.e2fs_first_dblock); 397 bp->b_un.b_fs->e2fs_log_bsize = fs2h32(sblock.e2fs.e2fs_log_bsize); 398 bp->b_un.b_fs->e2fs_fsize = fs2h32(sblock.e2fs.e2fs_fsize); 399 bp->b_un.b_fs->e2fs_bpg = fs2h32(sblock.e2fs.e2fs_bpg); 400 bp->b_un.b_fs->e2fs_fpg = fs2h32(sblock.e2fs.e2fs_fpg); 401 bp->b_un.b_fs->e2fs_ipg = fs2h32(sblock.e2fs.e2fs_ipg); 402 bp->b_un.b_fs->e2fs_mtime = fs2h32(sblock.e2fs.e2fs_mtime); 403 bp->b_un.b_fs->e2fs_wtime = fs2h32(sblock.e2fs.e2fs_wtime); 404 bp->b_un.b_fs->e2fs_lastfsck = fs2h32(sblock.e2fs.e2fs_lastfsck); 405 bp->b_un.b_fs->e2fs_fsckintv = fs2h32(sblock.e2fs.e2fs_fsckintv); 406 bp->b_un.b_fs->e2fs_creator = fs2h32(sblock.e2fs.e2fs_creator); 407 bp->b_un.b_fs->e2fs_rev = fs2h32(sblock.e2fs.e2fs_rev); 408 bp->b_un.b_fs->e2fs_mnt_count = fs2h16(sblock.e2fs.e2fs_mnt_count); 409 bp->b_un.b_fs->e2fs_max_mnt_count = 410 fs2h16(sblock.e2fs.e2fs_max_mnt_count); 411 bp->b_un.b_fs->e2fs_magic = fs2h16(sblock.e2fs.e2fs_magic); 412 bp->b_un.b_fs->e2fs_state = fs2h16(sblock.e2fs.e2fs_state); 413 bp->b_un.b_fs->e2fs_beh = fs2h16(sblock.e2fs.e2fs_beh); 414 bp->b_un.b_fs->e2fs_ruid = fs2h16(sblock.e2fs.e2fs_ruid); 415 bp->b_un.b_fs->e2fs_rgid = fs2h16(sblock.e2fs.e2fs_rgid); 416 } 417 418 void 419 badsb(listerr, s) 420 int listerr; 421 char *s; 422 { 423 424 if (!listerr) 425 return; 426 if (preen) 427 printf("%s: ", cdevname()); 428 pfatal("BAD SUPER BLOCK: %s\n", s); 429 } 430 431 /* 432 * Calculate a prototype superblock based on information in the disk label. 433 * When done the cgsblock macro can be calculated and the fs_ncg field 434 * can be used. Do NOT attempt to use other macros without verifying that 435 * their needed information is available! 436 */ 437 438 int 439 calcsb(dev, devfd, fs) 440 char *dev; 441 int devfd; 442 register struct m_ext2fs *fs; 443 { 444 register struct disklabel *lp; 445 register struct partition *pp; 446 register char *cp; 447 448 cp = strchr(dev, '\0') - 1; 449 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 450 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 451 return (0); 452 } 453 lp = getdisklabel(dev, devfd); 454 if (isdigit(*cp)) 455 pp = &lp->d_partitions[0]; 456 else 457 pp = &lp->d_partitions[*cp - 'a']; 458 if (pp->p_fstype != FS_EXT2FS) { 459 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 460 dev, pp->p_fstype < FSMAXTYPES ? 461 fstypenames[pp->p_fstype] : "unknown"); 462 return (0); 463 } 464 memset(fs, 0, sizeof(struct m_ext2fs)); 465 fs->e2fs_bsize = pp->p_fsize; 466 fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024; 467 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 468 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 469 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 470 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 471 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 472 fs->e2fs_bmask = ~fs->e2fs_qbmask; 473 fs->e2fs_ncg = 474 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 475 fs->e2fs.e2fs_bpg); 476 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 477 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 478 fs->e2fs_bsize / sizeof(struct ext2_gd)); 479 480 return (1); 481 } 482 483 static struct disklabel * 484 getdisklabel(s, fd) 485 char *s; 486 int fd; 487 { 488 static struct disklabel lab; 489 490 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 491 if (s == NULL) 492 return ((struct disklabel *)NULL); 493 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 494 errexit("%s: can't read disk label\n", s); 495 } 496 return (&lab); 497 } 498 499 daddr_t 500 cgoverhead(c) 501 int c; 502 { 503 int overh; 504 overh = 1 /* block bitmap */ + 505 1 /* inode bitmap */ + 506 sblock.e2fs_itpg; 507 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 508 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 509 if (cg_has_sb(c) == 0) 510 return overh; 511 } 512 overh += 1 + sblock.e2fs_ngdb; 513 return overh; 514 } 515