sbin/fsck_ffs/pass1.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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 #if 0
  33 #ifndef lint
  34 static const char sccsid[] = "@(#)pass1.c       8.6 (Berkeley) 4/28/95";
  35 #endif /* not lint */
  36 #endif
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include <sys/param.h>
  41 #include <sys/stat.h>
  42 #include <sys/sysctl.h>
  43
  44 #include <ufs/ufs/dinode.h>
  45 #include <ufs/ufs/dir.h>
  46 #include <ufs/ffs/fs.h>
  47
  48 #include <err.h>
  49 #include <limits.h>
  50 #include <stdint.h>
  51 #include <string.h>
  52
  53 #include "fsck.h"
  54
  55 static ufs2_daddr_t badblk;
  56 static ufs2_daddr_t dupblk;
  57 static ino_t lastino;           /* last inode in use */
  58
  59 static int checkinode(ino_t inumber, struct inodesc *, int rebuildcg);
  60
  61 void
  62 pass1(void)
  63 {
  64         struct inostat *info;
  65         struct inodesc idesc;
  66         struct bufarea *cgbp;
  67         struct cg *cgp;
  68         ino_t inumber, inosused, mininos;
  69         ufs2_daddr_t i, cgd;
  70         u_int8_t *cp;
  71         int c, rebuildcg;
  72
  73         badblk = dupblk = lastino = 0;
  74
  75         /*
  76          * Set file system reserved blocks in used block map.
  77          */
  78         for (c = 0; c < sblock.fs_ncg; c++) {
  79                 cgd = cgdmin(&sblock, c);
  80                 if (c == 0) {
  81                         i = cgbase(&sblock, c);
  82                 } else
  83                         i = cgsblock(&sblock, c);
  84                 for (; i < cgd; i++)
  85                         setbmap(i);
  86         }
  87         i = sblock.fs_csaddr;
  88         cgd = i + howmany(sblock.fs_cssize, sblock.fs_fsize);
  89         for (; i < cgd; i++)
  90                 setbmap(i);
  91
  92         /*
  93          * Find all allocated blocks.
  94          */
  95         memset(&idesc, 0, sizeof(struct inodesc));
  96         idesc.id_func = pass1check;
  97         n_files = n_blks = 0;
  98         for (c = 0; c < sblock.fs_ncg; c++) {
  99                 inumber = c * sblock.fs_ipg;
 100                 setinodebuf(inumber);
 101                 cgbp = cglookup(c);
 102                 cgp = cgbp->b_un.b_cg;
 103                 rebuildcg = 0;
 104                 if (!check_cgmagic(c, cgbp))
 105                         rebuildcg = 1;
 106                 if (!rebuildcg && sblock.fs_magic == FS_UFS2_MAGIC) {
 107                         inosused = cgp->cg_initediblk;
 108                         if (inosused > sblock.fs_ipg) {
 109                                 pfatal(
 110 "Too many initialized inodes (%ju > %d) in cylinder group %d\nReset to %d\n",
 111                                     (uintmax_t)inosused,
 112                                     sblock.fs_ipg, c, sblock.fs_ipg);
 113                                 inosused = sblock.fs_ipg;
 114                         }
 115                 } else {
 116                         inosused = sblock.fs_ipg;
 117                 }
 118                 if (got_siginfo) {
 119                         printf("%s: phase 1: cyl group %d of %d (%d%%)\n",
 120                             cdevname, c, sblock.fs_ncg,
 121                             c * 100 / sblock.fs_ncg);
 122                         got_siginfo = 0;
 123                 }
 124                 if (got_sigalarm) {
 125                         setproctitle("%s p1 %d%%", cdevname,
 126                              c * 100 / sblock.fs_ncg);
 127                         got_sigalarm = 0;
 128                 }
 129                 /*
 130                  * If we are using soft updates, then we can trust the
 131                  * cylinder group inode allocation maps to tell us which
 132                  * inodes are allocated. We will scan the used inode map
 133                  * to find the inodes that are really in use, and then
 134                  * read only those inodes in from disk.
 135                  */
 136                 if ((preen || inoopt) && usedsoftdep && !rebuildcg) {
 137                         cp = &cg_inosused(cgp)[(inosused - 1) / CHAR_BIT];
 138                         for ( ; inosused != 0; cp--) {
 139                                 if (*cp == 0) {
 140                                         if (inosused > CHAR_BIT)
 141                                                 inosused -= CHAR_BIT;
 142                                         else
 143                                                 inosused = 0;
 144                                         continue;
 145                                 }
 146                                 for (i = 1 << (CHAR_BIT - 1); i > 0; i >>= 1) {
 147                                         if (*cp & i)
 148                                                 break;
 149                                         inosused--;
 150                                 }
 151                                 break;
 152                         }
 153                 }
 154                 /*
 155                  * Allocate inoinfo structures for the allocated inodes.
 156                  */
 157                 inostathead[c].il_numalloced = inosused;
 158                 if (inosused == 0) {
 159                         inostathead[c].il_stat = NULL;
 160                         continue;
 161                 }
 162                 info = Calloc((unsigned)inosused, sizeof(struct inostat));
 163                 if (info == NULL)
 164                         errx(EEXIT, "cannot alloc %u bytes for inoinfo",
 165                             (unsigned)(sizeof(struct inostat) * inosused));
 166                 inostathead[c].il_stat = info;
 167                 /*
 168                  * Scan the allocated inodes.
 169                  */
 170                 for (i = 0; i < inosused; i++, inumber++) {
 171                         if (inumber < UFS_ROOTINO) {
 172                                 (void)getnextinode(inumber, rebuildcg);
 173                                 continue;
 174                         }
 175                         /*
 176                          * NULL return indicates probable end of allocated
 177                          * inodes during cylinder group rebuild attempt.
 178                          * We always keep trying until we get to the minimum
 179                          * valid number for this cylinder group.
 180                          */
 181                         if (checkinode(inumber, &idesc, rebuildcg) == 0 &&
 182                             i > cgp->cg_initediblk)
 183                                 break;
 184                 }
 185                 /*
 186                  * This optimization speeds up future runs of fsck
 187                  * by trimming down the number of inodes in cylinder
 188                  * groups that formerly had many inodes but now have
 189                  * fewer in use.
 190                  */
 191                 mininos = roundup(inosused + INOPB(&sblock), INOPB(&sblock));
 192                 if (inoopt && !preen && !rebuildcg &&
 193                     sblock.fs_magic == FS_UFS2_MAGIC &&
 194                     cgp->cg_initediblk > 2 * INOPB(&sblock) &&
 195                     mininos < cgp->cg_initediblk) {
 196                         i = cgp->cg_initediblk;
 197                         if (mininos < 2 * INOPB(&sblock))
 198                                 cgp->cg_initediblk = 2 * INOPB(&sblock);
 199                         else
 200                                 cgp->cg_initediblk = mininos;
 201                         pwarn("CYLINDER GROUP %d: RESET FROM %ju TO %d %s\n",
 202                             c, i, cgp->cg_initediblk, "VALID INODES");
 203                         dirty(cgbp);
 204                 }
 205                 if (inosused < sblock.fs_ipg)
 206                         continue;
 207                 lastino += 1;
 208                 if (lastino < (c * sblock.fs_ipg))
 209                         inosused = 0;
 210                 else
 211                         inosused = lastino - (c * sblock.fs_ipg);
 212                 if (rebuildcg && inosused > cgp->cg_initediblk &&
 213                     sblock.fs_magic == FS_UFS2_MAGIC) {
 214                         cgp->cg_initediblk = roundup(inosused, INOPB(&sblock));
 215                         pwarn("CYLINDER GROUP %d: FOUND %d VALID INODES\n", c,
 216                             cgp->cg_initediblk);
 217                 }
 218                 /*
 219                  * If we were not able to determine in advance which inodes
 220                  * were in use, then reduce the size of the inoinfo structure
 221                  * to the size necessary to describe the inodes that we
 222                  * really found.
 223                  */
 224                 if (inumber == lastino)
 225                         continue;
 226                 inostathead[c].il_numalloced = inosused;
 227                 if (inosused == 0) {
 228                         free(inostathead[c].il_stat);
 229                         inostathead[c].il_stat = NULL;
 230                         continue;
 231                 }
 232                 info = Calloc((unsigned)inosused, sizeof(struct inostat));
 233                 if (info == NULL)
 234                         errx(EEXIT, "cannot alloc %u bytes for inoinfo",
 235                             (unsigned)(sizeof(struct inostat) * inosused));
 236                 memmove(info, inostathead[c].il_stat, inosused * sizeof(*info));
 237                 free(inostathead[c].il_stat);
 238                 inostathead[c].il_stat = info;
 239         }
 240         freeinodebuf();
 241 }
 242
 243 static int
 244 checkinode(ino_t inumber, struct inodesc *idesc, int rebuildcg)
 245 {
 246         union dinode *dp;
 247         off_t kernmaxfilesize;
 248         ufs2_daddr_t ndb;
 249         mode_t mode;
 250         intmax_t size, fixsize;
 251         int j, ret, offset;
 252
 253         if ((dp = getnextinode(inumber, rebuildcg)) == NULL)
 254                 goto unknown;
 255         mode = DIP(dp, di_mode) & IFMT;
 256         if (mode == 0) {
 257                 if ((sblock.fs_magic == FS_UFS1_MAGIC &&
 258                      (memcmp(dp->dp1.di_db, ufs1_zino.di_db,
 259                         UFS_NDADDR * sizeof(ufs1_daddr_t)) ||
 260                       memcmp(dp->dp1.di_ib, ufs1_zino.di_ib,
 261                         UFS_NIADDR * sizeof(ufs1_daddr_t)) ||
 262                       dp->dp1.di_mode || dp->dp1.di_size)) ||
 263                     (sblock.fs_magic == FS_UFS2_MAGIC &&
 264                      (memcmp(dp->dp2.di_db, ufs2_zino.di_db,
 265                         UFS_NDADDR * sizeof(ufs2_daddr_t)) ||
 266                       memcmp(dp->dp2.di_ib, ufs2_zino.di_ib,
 267                         UFS_NIADDR * sizeof(ufs2_daddr_t)) ||
 268                       dp->dp2.di_mode || dp->dp2.di_size))) {
 269                         pfatal("PARTIALLY ALLOCATED INODE I=%lu",
 270                             (u_long)inumber);
 271                         if (reply("CLEAR") == 1) {
 272                                 dp = ginode(inumber);
 273                                 clearinode(dp);
 274                                 inodirty(dp);
 275                         }
 276                 }
 277                 inoinfo(inumber)->ino_state = USTATE;
 278                 return (1);
 279         }
 280         lastino = inumber;
 281         /* This should match the file size limit in ffs_mountfs(). */
 282         if (sblock.fs_magic == FS_UFS1_MAGIC)
 283                 kernmaxfilesize = (off_t)0x40000000 * sblock.fs_bsize - 1;
 284         else
 285                 kernmaxfilesize = sblock.fs_maxfilesize;
 286         if (DIP(dp, di_size) > kernmaxfilesize ||
 287             DIP(dp, di_size) > sblock.fs_maxfilesize ||
 288             (mode == IFDIR && DIP(dp, di_size) > MAXDIRSIZE)) {
 289                 if (debug)
 290                         printf("bad size %ju:", (uintmax_t)DIP(dp, di_size));
 291                 goto unknown;
 292         }
 293         if (!preen && mode == IFMT && reply("HOLD BAD BLOCK") == 1) {
 294                 dp = ginode(inumber);
 295                 DIP_SET(dp, di_size, sblock.fs_fsize);
 296                 DIP_SET(dp, di_mode, IFREG|0600);
 297                 inodirty(dp);
 298         }
 299         if ((mode == IFBLK || mode == IFCHR || mode == IFIFO ||
 300              mode == IFSOCK) && DIP(dp, di_size) != 0) {
 301                 if (debug)
 302                         printf("bad special-file size %ju:",
 303                             (uintmax_t)DIP(dp, di_size));
 304                 goto unknown;
 305         }
 306         if ((mode == IFBLK || mode == IFCHR) &&
 307             (dev_t)DIP(dp, di_rdev) == NODEV) {
 308                 if (debug)
 309                         printf("bad special-file rdev NODEV:");
 310                 goto unknown;
 311         }
 312         ndb = howmany(DIP(dp, di_size), sblock.fs_bsize);
 313         if (ndb < 0) {
 314                 if (debug)
 315                         printf("bad size %ju ndb %ju:",
 316                                 (uintmax_t)DIP(dp, di_size), (uintmax_t)ndb);
 317                 goto unknown;
 318         }
 319         if (mode == IFBLK || mode == IFCHR)
 320                 ndb++;
 321         if (mode == IFLNK) {
 322                 /*
 323                  * Fake ndb value so direct/indirect block checks below
 324                  * will detect any garbage after symlink string.
 325                  */
 326                 if (DIP(dp, di_size) < (off_t)sblock.fs_maxsymlinklen) {
 327                         if (sblock.fs_magic == FS_UFS1_MAGIC)
 328                                 ndb = howmany(DIP(dp, di_size),
 329                                     sizeof(ufs1_daddr_t));
 330                         else
 331                                 ndb = howmany(DIP(dp, di_size),
 332                                     sizeof(ufs2_daddr_t));
 333                         if (ndb > UFS_NDADDR) {
 334                                 j = ndb - UFS_NDADDR;
 335                                 for (ndb = 1; j > 1; j--)
 336                                         ndb *= NINDIR(&sblock);
 337                                 ndb += UFS_NDADDR;
 338                         }
 339                 }
 340         }
 341         for (j = ndb; ndb < UFS_NDADDR && j < UFS_NDADDR; j++)
 342                 if (DIP(dp, di_db[j]) != 0) {
 343                         if (debug)
 344                                 printf("bad direct addr[%d]: %ju\n", j,
 345                                     (uintmax_t)DIP(dp, di_db[j]));
 346                         goto unknown;
 347                 }
 348         for (j = 0, ndb -= UFS_NDADDR; ndb > 0; j++)
 349                 ndb /= NINDIR(&sblock);
 350         for (; j < UFS_NIADDR; j++)
 351                 if (DIP(dp, di_ib[j]) != 0) {
 352                         if (debug)
 353                                 printf("bad indirect addr: %ju\n",
 354                                     (uintmax_t)DIP(dp, di_ib[j]));
 355                         goto unknown;
 356                 }
 357         if (ftypeok(dp) == 0)
 358                 goto unknown;
 359         n_files++;
 360         inoinfo(inumber)->ino_linkcnt = DIP(dp, di_nlink);
 361         if (mode == IFDIR) {
 362                 if (DIP(dp, di_size) == 0)
 363                         inoinfo(inumber)->ino_state = DCLEAR;
 364                 else if (DIP(dp, di_nlink) <= 0)
 365                         inoinfo(inumber)->ino_state = DZLINK;
 366                 else
 367                         inoinfo(inumber)->ino_state = DSTATE;
 368                 cacheino(dp, inumber);
 369                 countdirs++;
 370         } else if (DIP(dp, di_nlink) <= 0)
 371                 inoinfo(inumber)->ino_state = FZLINK;
 372         else
 373                 inoinfo(inumber)->ino_state = FSTATE;
 374         inoinfo(inumber)->ino_type = IFTODT(mode);
 375         badblk = dupblk = 0;
 376         idesc->id_number = inumber;
 377         if (DIP(dp, di_flags) & SF_SNAPSHOT)
 378                 idesc->id_type = SNAP;
 379         else
 380                 idesc->id_type = ADDR;
 381         (void)ckinode(dp, idesc);
 382         if (sblock.fs_magic == FS_UFS2_MAGIC && dp->dp2.di_extsize > 0) {
 383                 idesc->id_type = ADDR;
 384                 ndb = howmany(dp->dp2.di_extsize, sblock.fs_bsize);
 385                 for (j = 0; j < UFS_NXADDR; j++) {
 386                         if (--ndb == 0 &&
 387                             (offset = blkoff(&sblock, dp->dp2.di_extsize)) != 0)
 388                                 idesc->id_numfrags = numfrags(&sblock,
 389                                     fragroundup(&sblock, offset));
 390                         else
 391                                 idesc->id_numfrags = sblock.fs_frag;
 392                         if (dp->dp2.di_extb[j] == 0)
 393                                 continue;
 394                         idesc->id_blkno = dp->dp2.di_extb[j];
 395                         ret = (*idesc->id_func)(idesc);
 396                         if (ret & STOP)
 397                                 break;
 398                 }
 399         }
 400         if (sblock.fs_magic == FS_UFS2_MAGIC)
 401                 eascan(idesc, &dp->dp2);
 402         idesc->id_entryno *= btodb(sblock.fs_fsize);
 403         if (DIP(dp, di_blocks) != idesc->id_entryno) {
 404                 pwarn("INCORRECT BLOCK COUNT I=%lu (%ju should be %ju)",
 405                     (u_long)inumber, (uintmax_t)DIP(dp, di_blocks),
 406                     (uintmax_t)idesc->id_entryno);
 407                 if (preen)
 408                         printf(" (CORRECTED)\n");
 409                 else if (reply("CORRECT") == 0)
 410                         return (1);
 411                 if (bkgrdflag == 0) {
 412                         dp = ginode(inumber);
 413                         DIP_SET(dp, di_blocks, idesc->id_entryno);
 414                         inodirty(dp);
 415                 } else {
 416                         cmd.value = idesc->id_number;
 417                         cmd.size = idesc->id_entryno - DIP(dp, di_blocks);
 418                         if (debug)
 419                                 printf("adjblkcnt ino %ju amount %lld\n",
 420                                     (uintmax_t)cmd.value, (long long)cmd.size);
 421                         if (sysctl(adjblkcnt, MIBSIZE, 0, 0,
 422                             &cmd, sizeof cmd) == -1)
 423                                 rwerror("ADJUST INODE BLOCK COUNT", cmd.value);
 424                 }
 425         }
 426         /*
 427          * UFS does not allow files to end with a hole; it requires that
 428          * the last block of a file be allocated. The last allocated block
 429          * in a file is tracked in id_lballoc. Here, we check for a size
 430          * past the last allocated block of the file and if that is found,
 431          * shorten the file to reference the last allocated block to avoid
 432          * having it reference a hole at its end.
 433          *
 434          * Soft updates will always ensure that the file size is correct
 435          * for files that contain only direct block pointers. However
 436          * soft updates does not roll back sizes for files with indirect
 437          * blocks that it has set to unallocated because their contents
 438          * have not yet been written to disk. Hence, the file can appear
 439          * to have a hole at its end because the block pointer has been
 440          * rolled back to zero. Thus finding a hole at the end of a file
 441          * that is located in an indirect block receives only a warning
 442          * while finding a hole at the end of a file in a direct block
 443          * receives a fatal error message.
 444          */
 445         size = DIP(dp, di_size);
 446         if (idesc->id_lballoc < lblkno(&sblock, size - 1) &&
 447             /* exclude embedded symbolic links */
 448             ((mode != IFLNK) || size >= sblock.fs_maxsymlinklen)) {
 449                 fixsize = lblktosize(&sblock, idesc->id_lballoc + 1);
 450                 if (size > UFS_NDADDR * sblock.fs_bsize)
 451                         pwarn("INODE %lu: FILE SIZE %ju BEYOND END OF "
 452                               "ALLOCATED FILE, SIZE SHOULD BE %ju",
 453                               (u_long)inumber, size, fixsize);
 454                 else
 455                         pfatal("INODE %lu: FILE SIZE %ju BEYOND END OF "
 456                               "ALLOCATED FILE, SIZE SHOULD BE %ju",
 457                               (u_long)inumber, size, fixsize);
 458                 if (preen)
 459                         printf(" (ADJUSTED)\n");
 460                 else if (reply("ADJUST") == 0)
 461                         return (1);
 462                 if (bkgrdflag == 0) {
 463                         dp = ginode(inumber);
 464                         DIP_SET(dp, di_size, fixsize);
 465                         inodirty(dp);
 466                 } else {
 467                         cmd.value = idesc->id_number;
 468                         cmd.size = fixsize;
 469                         if (debug)
 470                                 printf("setsize ino %ju size set to %ju\n",
 471                                     (uintmax_t)cmd.value, (uintmax_t)cmd.size);
 472                         if (sysctl(setsize, MIBSIZE, 0, 0,
 473                             &cmd, sizeof cmd) == -1)
 474                                 rwerror("SET INODE SIZE", cmd.value);
 475                 }
 476
 477         }
 478         return (1);
 479 unknown:
 480         pfatal("UNKNOWN FILE TYPE I=%lu", (u_long)inumber);
 481         inoinfo(inumber)->ino_state = FCLEAR;
 482         if (reply("CLEAR") == 1) {
 483                 inoinfo(inumber)->ino_state = USTATE;
 484                 dp = ginode(inumber);
 485                 clearinode(dp);
 486                 inodirty(dp);
 487         }
 488         return (1);
 489 }
 490
 491 int
 492 pass1check(struct inodesc *idesc)
 493 {
 494         int res = KEEPON;
 495         int anyout, nfrags;
 496         ufs2_daddr_t blkno = idesc->id_blkno;
 497         struct dups *dlp;
 498         struct dups *new;
 499
 500         if (idesc->id_type == SNAP) {
 501                 if (blkno == BLK_NOCOPY)
 502                         return (KEEPON);
 503                 if (idesc->id_number == cursnapshot) {
 504                         if (blkno == blkstofrags(&sblock, idesc->id_lbn))
 505                                 return (KEEPON);
 506                         if (blkno == BLK_SNAP) {
 507                                 blkno = blkstofrags(&sblock, idesc->id_lbn);
 508                                 idesc->id_entryno -= idesc->id_numfrags;
 509                         }
 510                 } else {
 511                         if (blkno == BLK_SNAP)
 512                                 return (KEEPON);
 513                 }
 514         }
 515         if ((anyout = chkrange(blkno, idesc->id_numfrags)) != 0) {
 516                 blkerror(idesc->id_number, "BAD", blkno);
 517                 if (badblk++ >= MAXBAD) {
 518                         pwarn("EXCESSIVE BAD BLKS I=%lu",
 519                             (u_long)idesc->id_number);
 520                         if (preen)
 521                                 printf(" (SKIPPING)\n");
 522                         else if (reply("CONTINUE") == 0) {
 523                                 ckfini(0);
 524                                 exit(EEXIT);
 525                         }
 526                         rerun = 1;
 527                         return (STOP);
 528                 }
 529         }
 530         for (nfrags = idesc->id_numfrags; nfrags > 0; blkno++, nfrags--) {
 531                 if (anyout && chkrange(blkno, 1)) {
 532                         res = SKIP;
 533                 } else if (!testbmap(blkno)) {
 534                         n_blks++;
 535                         setbmap(blkno);
 536                 } else {
 537                         blkerror(idesc->id_number, "DUP", blkno);
 538                         if (dupblk++ >= MAXDUP) {
 539                                 pwarn("EXCESSIVE DUP BLKS I=%lu",
 540                                         (u_long)idesc->id_number);
 541                                 if (preen)
 542                                         printf(" (SKIPPING)\n");
 543                                 else if (reply("CONTINUE") == 0) {
 544                                         ckfini(0);
 545                                         exit(EEXIT);
 546                                 }
 547                                 rerun = 1;
 548                                 return (STOP);
 549                         }
 550                         new = (struct dups *)Malloc(sizeof(struct dups));
 551                         if (new == NULL) {
 552                                 pfatal("DUP TABLE OVERFLOW.");
 553                                 if (reply("CONTINUE") == 0) {
 554                                         ckfini(0);
 555                                         exit(EEXIT);
 556                                 }
 557                                 rerun = 1;
 558                                 return (STOP);
 559                         }
 560                         new->dup = blkno;
 561                         if (muldup == NULL) {
 562                                 duplist = muldup = new;
 563                                 new->next = NULL;
 564                         } else {
 565                                 new->next = muldup->next;
 566                                 muldup->next = new;
 567                         }
 568                         for (dlp = duplist; dlp != muldup; dlp = dlp->next)
 569                                 if (dlp->dup == blkno)
 570                                         break;
 571                         if (dlp == muldup && dlp->dup != blkno)
 572                                 muldup = new;
 573                 }
 574                 /*
 575                  * count the number of blocks found in id_entryno
 576                  */
 577                 idesc->id_entryno++;
 578         }
 579         if (idesc->id_level == 0 && idesc->id_lballoc < idesc->id_lbn)
 580                 idesc->id_lballoc = idesc->id_lbn;
 581         return (res);
 582 }