sbin/fsck_ext2fs/setup.c

   1 /*      $NetBSD: setup.c,v 1.28 2011/09/16 16:13:18 plunky 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 1.28 2011/09/16 16:13:18 plunky 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 "fsck.h"
  82 #include "extern.h"
  83 #include "fsutil.h"
  84 #include "exitvalues.h"
  85
  86 void badsb(int, const char *);
  87 int calcsb(const char *, int, struct m_ext2fs *);
  88 static struct disklabel *getdisklabel(const char *, int);
  89 static int readsb(int);
  90
  91 int
  92 setup(const char *dev)
  93 {
  94         long cg, asked, i;
  95         long bmapsize;
  96         struct disklabel *lp;
  97 #ifndef __minix
  98         off_t sizepb;
  99 #else
 100         u64_t sizepb;
 101 #endif
 102         struct stat statb;
 103         struct m_ext2fs proto;
 104         int doskipclean;
 105         u_int64_t maxfilesize;
 106
 107         havesb = 0;
 108         fswritefd = -1;
 109         doskipclean = skipclean;
 110         if (stat(dev, &statb) < 0) {
 111                 printf("Can't stat %s: %s\n", dev, strerror(errno));
 112                 return 0;
 113         }
 114
 115 #ifndef __minix
 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 #endif
 122
 123         if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
 124                 printf("Can't open %s: %s\n", dev, strerror(errno));
 125                 return 0;
 126         }
 127         if (preen == 0)
 128                 printf("** %s", dev);
 129         if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
 130                 fswritefd = -1;
 131                 if (preen)
 132                         pfatal("NO WRITE ACCESS");
 133                 printf(" (NO WRITE)");
 134         }
 135         if (preen == 0)
 136                 printf("\n");
 137         fsmodified = 0;
 138         lfdir = 0;
 139         initbarea(&sblk);
 140         initbarea(&asblk);
 141         sblk.b_un.b_buf = malloc(SBSIZE);
 142         asblk.b_un.b_buf = malloc(SBSIZE);
 143         if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
 144                 errexit("cannot allocate space for superblock");
 145         if ((lp = getdisklabel(NULL, fsreadfd)) != NULL)
 146                 dev_bsize = secsize = lp->d_secsize;
 147         else
 148                 dev_bsize = secsize = DEV_BSIZE;
 149         /*
 150          * Read in the superblock, looking for alternates if necessary
 151          */
 152         if (readsb(1) == 0) {
 153                 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0)
 154                         return 0;
 155                 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
 156                         return 0;
 157                 for (cg = 1; cg < proto.e2fs_ncg; cg++) {
 158                         bflag = fsbtodb(&proto,
 159                             cg * proto.e2fs.e2fs_bpg +
 160                             proto.e2fs.e2fs_first_dblock);
 161                         if (readsb(0) != 0)
 162                                 break;
 163                 }
 164                 if (cg >= proto.e2fs_ncg) {
 165                         printf("%s %s\n%s %s\n%s %s\n",
 166                             "SEARCH FOR ALTERNATE SUPER-BLOCK",
 167                             "FAILED. YOU MUST USE THE",
 168                             "-b OPTION TO FSCK_FFS TO SPECIFY THE",
 169                             "LOCATION OF AN ALTERNATE",
 170                             "SUPER-BLOCK TO SUPPLY NEEDED",
 171                             "INFORMATION; SEE fsck_ext2fs(8).");
 172                         return 0;
 173                 }
 174                 doskipclean = 0;
 175                 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
 176         }
 177         if (debug)
 178                 printf("state = %d\n", sblock.e2fs.e2fs_state);
 179         if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) {
 180                 if (doskipclean) {
 181                         pwarn("%sile system is clean; not checking\n",
 182                             preen ? "f" : "** F");
 183                         return -1;
 184                 }
 185                 if (!preen)
 186                         pwarn("** File system is already clean\n");
 187         }
 188         maxfsblock = sblock.e2fs.e2fs_bcount;
 189         maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg;
 190         sizepb = sblock.e2fs_bsize;
 191         maxfilesize = sblock.e2fs_bsize * NDADDR - 1;
 192         for (i = 0; i < NIADDR; i++) {
 193                 sizepb *= NINDIR(&sblock);
 194                 maxfilesize += sizepb;
 195         }
 196         /*
 197          * Check and potentially fix certain fields in the super block.
 198          */
 199         if (/* (sblock.e2fs.e2fs_rbcount < 0) || */
 200             (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) {
 201                 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK",
 202                     sblock.e2fs.e2fs_rbcount);
 203                 if (reply("SET TO DEFAULT") == 1) {
 204                         sblock.e2fs.e2fs_rbcount =
 205                             sblock.e2fs.e2fs_bcount * MINFREE / 100;
 206                         sbdirty();
 207                         dirty(&asblk);
 208                 }
 209         }
 210         if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) {
 211                 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK",
 212                     sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg);
 213                 return 0;
 214         }
 215         if (asblk.b_dirty && !bflag) {
 216                 copyback_sb(&asblk);
 217                 flush(fswritefd, &asblk);
 218         }
 219         /*
 220          * read in the summary info.
 221          */
 222
 223         sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize);
 224         if (sblock.e2fs_gd == NULL)
 225                 errexit("out of memory");
 226         asked = 0;
 227         for (i = 0; i < sblock.e2fs_ngdb; i++) {
 228                 if (bread(fsreadfd,
 229                     (char *)&sblock.e2fs_gd[i * sblock.e2fs_bsize /
 230                     sizeof(struct ext2_gd)],
 231                     fsbtodb(&sblock, ((sblock.e2fs_bsize > 1024) ? 0 : 1) +
 232                     i + 1),
 233                     sblock.e2fs_bsize) != 0 && !asked) {
 234                         pfatal("BAD SUMMARY INFORMATION");
 235                         if (reply("CONTINUE") == 0)
 236                                 exit(FSCK_EXIT_CHECK_FAILED);
 237                         asked++;
 238                 }
 239         }
 240         /*
 241          * allocate and initialize the necessary maps
 242          */
 243         bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t));
 244         blockmap = calloc((unsigned int)bmapsize, sizeof(char));
 245         if (blockmap == NULL) {
 246                 printf("cannot alloc %u bytes for blockmap\n",
 247                     (unsigned int)bmapsize);
 248                 goto badsblabel;
 249         }
 250         statemap = calloc((unsigned int)(maxino + 2), sizeof(char));
 251         if (statemap == NULL) {
 252                 printf("cannot alloc %u bytes for statemap\n",
 253                     (unsigned int)(maxino + 1));
 254                 goto badsblabel;
 255         }
 256         typemap = calloc((unsigned int)(maxino + 1), sizeof(char));
 257         if (typemap == NULL) {
 258                 printf("cannot alloc %u bytes for typemap\n",
 259                     (unsigned int)(maxino + 1));
 260                 goto badsblabel;
 261         }
 262         lncntp = calloc((unsigned)(maxino + 1), sizeof(int16_t));
 263         if (lncntp == NULL) {
 264                 printf("cannot alloc %u bytes for lncntp\n",
 265                     (unsigned int)((maxino + 1) * sizeof(int16_t)));
 266                 goto badsblabel;
 267         }
 268         for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) {
 269                 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs);
 270         }
 271         inplast = 0;
 272         listmax = numdirs + 10;
 273         inpsort = calloc((unsigned int)listmax, sizeof(struct inoinfo *));
 274         inphead = calloc((unsigned int)numdirs, sizeof(struct inoinfo *));
 275         if (inpsort == NULL || inphead == NULL) {
 276                 printf("cannot alloc %u bytes for inphead\n",
 277                     (unsigned int)(numdirs * sizeof(struct inoinfo *)));
 278                 goto badsblabel;
 279         }
 280         bufinit();
 281         return 1;
 282
 283 badsblabel:
 284         ckfini(0);
 285         return 0;
 286 }
 287
 288 /*
 289  * Read in the super block and its summary info, convert to host byte order.
 290  */
 291 static int
 292 readsb(int listerr)
 293 {
 294         daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
 295
 296         if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0)
 297                 return 0;
 298         sblk.b_bno = super;
 299         sblk.b_size = SBSIZE;
 300
 301         /* Copy the superblock in memory */
 302         e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs);
 303
 304         /*
 305          * run a few consistency checks of the super block
 306          */
 307         if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) {
 308                 badsb(listerr, "MAGIC NUMBER WRONG");
 309                 return 0;
 310         }
 311         if (sblock.e2fs.e2fs_log_bsize > 2) {
 312                 badsb(listerr, "BAD LOG_BSIZE");
 313                 return 0;
 314         }
 315         if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
 316             (!powerof2(sblock.e2fs.e2fs_inode_size) ||
 317              sblock.e2fs.e2fs_inode_size < sizeof(struct ext2fs_dinode) ||
 318              sblock.e2fs.e2fs_inode_size >
 319               (1024 << sblock.e2fs.e2fs_log_bsize))) {
 320                 badsb(listerr, "BAD INODE_SIZE");
 321                 return 0;
 322         }
 323
 324         /* compute the dynamic fields of the in-memory sb */
 325         /* compute dynamic sb infos */
 326         sblock.e2fs_ncg =
 327             howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock,
 328             sblock.e2fs.e2fs_bpg);
 329         /* XXX assume hw bsize = 512 */
 330         sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1;
 331         sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize;
 332         sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize;
 333         sblock.e2fs_qbmask = sblock.e2fs_bsize - 1;
 334         sblock.e2fs_bmask = ~sblock.e2fs_qbmask;
 335         sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg,
 336             sblock.e2fs_bsize / sizeof(struct ext2_gd));
 337         sblock.e2fs_ipb = sblock.e2fs_bsize / EXT2_DINODE_SIZE(&sblock);
 338         sblock.e2fs_itpg = howmany(sblock.e2fs.e2fs_ipg, sblock.e2fs_ipb);
 339
 340         /*
 341          * Compute block size that the filesystem is based on,
 342          * according to fsbtodb, and adjust superblock block number
 343          * so we can tell if this is an alternate later.
 344          */
 345         super *= dev_bsize;
 346         dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1);
 347         sblk.b_bno = super / dev_bsize;
 348
 349         if (sblock.e2fs_ncg == 1) {
 350                 /* no alternate superblock; assume it's okay */
 351                 havesb = 1;
 352                 return 1;
 353         }
 354         getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock,
 355                 (long)SBSIZE);
 356         if (asblk.b_errs)
 357                 return 0;
 358         if (bflag) {
 359                 havesb = 1;
 360                 return 1;
 361         }
 362
 363         /*
 364          * Set all possible fields that could differ, then do check
 365          * of whole super block against an alternate super block.
 366          * When an alternate super-block is specified this check is skipped.
 367          */
 368         asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount;
 369         asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount;
 370         asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount;
 371         asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime;
 372         asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime;
 373         asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count;
 374         asblk.b_un.b_fs->e2fs_max_mnt_count =
 375             sblk.b_un.b_fs->e2fs_max_mnt_count;
 376         asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state;
 377         asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh;
 378         asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck;
 379         asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv;
 380         asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid;
 381         asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid;
 382         asblk.b_un.b_fs->e2fs_block_group_nr =
 383             sblk.b_un.b_fs->e2fs_block_group_nr;
 384         asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE;
 385         asblk.b_un.b_fs->e2fs_features_rocompat |=
 386             sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE;
 387         if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
 388             ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) ||
 389             (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) {
 390                 if (debug) {
 391                         printf("compat 0x%08x, incompat 0x%08x, compat_ro "
 392                             "0x%08x\n",
 393                             sblock.e2fs.e2fs_features_compat,
 394                             sblock.e2fs.e2fs_features_incompat,
 395                             sblock.e2fs.e2fs_features_rocompat);
 396                 }
 397                 badsb(listerr, "INCOMPATIBLE FEATURE BITS IN SUPER BLOCK");
 398                 return 0;
 399         }
 400         if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) {
 401                 if (debug) {
 402                         u_int32_t *nlp, *olp, *endlp;
 403
 404                         printf("superblock mismatches\n");
 405                         nlp = (u_int32_t *)asblk.b_un.b_fs;
 406                         olp = (u_int32_t *)sblk.b_un.b_fs;
 407                         endlp = olp + (SBSIZE / sizeof(*olp));
 408                         for ( ; olp < endlp; olp++, nlp++) {
 409                                 if (*olp == *nlp)
 410                                         continue;
 411                                 printf("offset %ld, original %ld, "
 412                                     "alternate %ld\n",
 413                                     (long)(olp - (u_int32_t *)sblk.b_un.b_fs),
 414                                     (long)fs2h32(*olp),
 415                                     (long)fs2h32(*nlp));
 416                         }
 417                 }
 418                 badsb(listerr,
 419                     "VALUES IN SUPER BLOCK DISAGREE WITH "
 420                     "THOSE IN FIRST ALTERNATE");
 421                 return 0;
 422         }
 423         havesb = 1;
 424         return 1;
 425 }
 426
 427 void
 428 copyback_sb(struct bufarea *bp)
 429 {
 430         /* Copy the in-memory superblock back to buffer */
 431         bp->b_un.b_fs->e2fs_icount = h2fs32(sblock.e2fs.e2fs_icount);
 432         bp->b_un.b_fs->e2fs_bcount = h2fs32(sblock.e2fs.e2fs_bcount);
 433         bp->b_un.b_fs->e2fs_rbcount = h2fs32(sblock.e2fs.e2fs_rbcount);
 434         bp->b_un.b_fs->e2fs_fbcount = h2fs32(sblock.e2fs.e2fs_fbcount);
 435         bp->b_un.b_fs->e2fs_ficount = h2fs32(sblock.e2fs.e2fs_ficount);
 436         bp->b_un.b_fs->e2fs_first_dblock =
 437             h2fs32(sblock.e2fs.e2fs_first_dblock);
 438         bp->b_un.b_fs->e2fs_log_bsize = h2fs32(sblock.e2fs.e2fs_log_bsize);
 439         bp->b_un.b_fs->e2fs_fsize = h2fs32(sblock.e2fs.e2fs_fsize);
 440         bp->b_un.b_fs->e2fs_bpg = h2fs32(sblock.e2fs.e2fs_bpg);
 441         bp->b_un.b_fs->e2fs_fpg = h2fs32(sblock.e2fs.e2fs_fpg);
 442         bp->b_un.b_fs->e2fs_ipg = h2fs32(sblock.e2fs.e2fs_ipg);
 443         bp->b_un.b_fs->e2fs_mtime = h2fs32(sblock.e2fs.e2fs_mtime);
 444         bp->b_un.b_fs->e2fs_wtime = h2fs32(sblock.e2fs.e2fs_wtime);
 445         bp->b_un.b_fs->e2fs_lastfsck = h2fs32(sblock.e2fs.e2fs_lastfsck);
 446         bp->b_un.b_fs->e2fs_fsckintv = h2fs32(sblock.e2fs.e2fs_fsckintv);
 447         bp->b_un.b_fs->e2fs_creator = h2fs32(sblock.e2fs.e2fs_creator);
 448         bp->b_un.b_fs->e2fs_rev = h2fs32(sblock.e2fs.e2fs_rev);
 449         bp->b_un.b_fs->e2fs_mnt_count = h2fs16(sblock.e2fs.e2fs_mnt_count);
 450         bp->b_un.b_fs->e2fs_max_mnt_count =
 451             h2fs16(sblock.e2fs.e2fs_max_mnt_count);
 452         bp->b_un.b_fs->e2fs_magic = h2fs16(sblock.e2fs.e2fs_magic);
 453         bp->b_un.b_fs->e2fs_state = h2fs16(sblock.e2fs.e2fs_state);
 454         bp->b_un.b_fs->e2fs_beh = h2fs16(sblock.e2fs.e2fs_beh);
 455         bp->b_un.b_fs->e2fs_ruid = h2fs16(sblock.e2fs.e2fs_ruid);
 456         bp->b_un.b_fs->e2fs_rgid = h2fs16(sblock.e2fs.e2fs_rgid);
 457 }
 458
 459 void
 460 badsb(int listerr, const char *s)
 461 {
 462
 463         if (!listerr)
 464                 return;
 465         if (preen)
 466                 printf("%s: ", cdevname());
 467         pfatal("BAD SUPER BLOCK: %s\n", s);
 468 }
 469
 470 /*
 471  * Calculate a prototype superblock based on information in the disk label.
 472  * When done the cgsblock macro can be calculated and the fs_ncg field
 473  * can be used. Do NOT attempt to use other macros without verifying that
 474  * their needed information is available!
 475  */
 476
 477 int
 478 calcsb(const char *dev, int devfd, struct m_ext2fs *fs)
 479 {
 480 #ifdef __minix
 481         errexit("%s: calcsb: can't read disk label under minix", dev);
 482 #else
 483         struct disklabel *lp;
 484         struct partition *pp;
 485         char *cp;
 486
 487         cp = strchr(dev, '\0');
 488         if (cp-- == dev ||
 489             ((*cp < 'a' || *cp > 'h') && !isdigit((unsigned char)*cp))) {
 490                 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
 491                 return 0;
 492         }
 493         lp = getdisklabel(dev, devfd);
 494         if (isdigit((unsigned char)*cp))
 495                 pp = &lp->d_partitions[0];
 496         else
 497                 pp = &lp->d_partitions[*cp - 'a'];
 498         if (pp->p_fstype != FS_EX2FS) {
 499                 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n",
 500                     dev, pp->p_fstype < FSMAXTYPES ?
 501                     fstypenames[pp->p_fstype] : "unknown");
 502                 return 0;
 503         }
 504         memset(fs, 0, sizeof(struct m_ext2fs));
 505         fs->e2fs_bsize = pp->p_fsize;
 506         fs->e2fs.e2fs_log_bsize = pp->p_fsize / 1024;
 507         fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize;
 508         fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0;
 509         fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY;
 510         fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize;
 511         fs->e2fs_qbmask = fs->e2fs_bsize - 1;
 512         fs->e2fs_bmask = ~fs->e2fs_qbmask;
 513         fs->e2fs_ncg =
 514             howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,
 515             fs->e2fs.e2fs_bpg);
 516         fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
 517         fs->e2fs_ngdb = howmany(fs->e2fs_ncg,
 518             fs->e2fs_bsize / sizeof(struct ext2_gd));
 519
 520         return 1;
 521 #endif
 522 }
 523
 524 static struct disklabel *
 525 getdisklabel(const char *s, int fd)
 526 {
 527         static struct disklabel lab;
 528
 529 #ifdef __minix
 530         if (s == NULL)
 531                 return NULL;
 532         errexit("%s: can't read disk label under minix", s);
 533 #else
 534         if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
 535                 if (s == NULL)
 536                         return NULL;
 537                 pwarn("ioctl (GCINFO): %s\n", strerror(errno));
 538                 errexit("%s: can't read disk label", s);
 539         }
 540 #endif
 541         return &lab;
 542 }
 543
 544 daddr_t
 545 cgoverhead(int c)
 546 {
 547         int overh;
 548         overh =
 549             1 /* block bitmap */ +
 550             1 /* inode bitmap */ +
 551             sblock.e2fs_itpg;
 552         if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
 553             sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
 554                 if (cg_has_sb(c) == 0)
 555                         return overh;
 556         }
 557         overh += 1 /* superblock */ + sblock.e2fs_ngdb;
 558         return overh;
 559 }