sbin/fsck_ffs/pass1.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if 0
  31 #ifndef lint
  32 static const char sccsid[] = "@(#)pass1.c       8.6 (Berkeley) 4/28/95";
  33 #endif /* not lint */
  34 #endif
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40 #include <sys/sysctl.h>
  41
  42 #include <ufs/ufs/dinode.h>
  43 #include <ufs/ufs/dir.h>
  44 #include <ufs/ffs/fs.h>
  45
  46 #include <err.h>
  47 #include <limits.h>
  48 #include <stdint.h>
  49 #include <string.h>
  50
  51 #include "fsck.h"
  52
  53 static ufs2_daddr_t badblk;
  54 static ufs2_daddr_t dupblk;
  55 static ino_t lastino;           /* last inode in use */
  56
  57 static int checkinode(ino_t inumber, struct inodesc *, int rebuildcg);
  58
  59 void
  60 pass1(void)
  61 {
  62         struct inostat *info;
  63         struct inodesc idesc;
  64         struct bufarea *cgbp;
  65         struct cg *cgp;
  66         ino_t inumber, inosused, mininos;
  67         ufs2_daddr_t i, cgd;
  68         u_int8_t *cp;
  69         int c, rebuildcg;
  70
  71         badblk = dupblk = lastino = 0;
  72
  73         /*
  74          * Set file system reserved blocks in used block map.
  75          */
  76         for (c = 0; c < sblock.fs_ncg; c++) {
  77                 cgd = cgdmin(&sblock, c);
  78                 if (c == 0) {
  79                         i = cgbase(&sblock, c);
  80                 } else
  81                         i = cgsblock(&sblock, c);
  82                 for (; i < cgd; i++)
  83                         setbmap(i);
  84         }
  85         i = sblock.fs_csaddr;
  86         cgd = i + howmany(sblock.fs_cssize, sblock.fs_fsize);
  87         for (; i < cgd; i++)
  88                 setbmap(i);
  89
  90         /*
  91          * Find all allocated blocks.
  92          */
  93         memset(&idesc, 0, sizeof(struct inodesc));
  94         idesc.id_func = pass1check;
  95         n_files = n_blks = 0;
  96         for (c = 0; c < sblock.fs_ncg; c++) {
  97                 inumber = c * sblock.fs_ipg;
  98                 setinodebuf(inumber);
  99                 cgbp = cgget(c);
 100                 cgp = cgbp->b_un.b_cg;
 101                 rebuildcg = 0;
 102                 if (!check_cgmagic(c, cgbp))
 103                         rebuildcg = 1;
 104                 if (!rebuildcg && sblock.fs_magic == FS_UFS2_MAGIC) {
 105                         inosused = cgp->cg_initediblk;
 106                         if (inosused > sblock.fs_ipg) {
 107                                 pfatal(
 108 "Too many initialized inodes (%ju > %d) in cylinder group %d\nReset to %d\n",
 109                                     (uintmax_t)inosused,
 110                                     sblock.fs_ipg, c, sblock.fs_ipg);
 111                                 inosused = sblock.fs_ipg;
 112                         }
 113                 } else {
 114                         inosused = sblock.fs_ipg;
 115                 }
 116                 if (got_siginfo) {
 117                         printf("%s: phase 1: cyl group %d of %d (%d%%)\n",
 118                             cdevname, c, sblock.fs_ncg,
 119                             c * 100 / sblock.fs_ncg);
 120                         got_siginfo = 0;
 121                 }
 122                 if (got_sigalarm) {
 123                         setproctitle("%s p1 %d%%", cdevname,
 124                              c * 100 / sblock.fs_ncg);
 125                         got_sigalarm = 0;
 126                 }
 127                 /*
 128                  * If we are using soft updates, then we can trust the
 129                  * cylinder group inode allocation maps to tell us which
 130                  * inodes are allocated. We will scan the used inode map
 131                  * to find the inodes that are really in use, and then
 132                  * read only those inodes in from disk.
 133                  */
 134                 if ((preen || inoopt) && usedsoftdep && !rebuildcg) {
 135                         cp = &cg_inosused(cgp)[(inosused - 1) / CHAR_BIT];
 136                         for ( ; inosused != 0; cp--) {
 137                                 if (*cp == 0) {
 138                                         if (inosused > CHAR_BIT)
 139                                                 inosused -= CHAR_BIT;
 140                                         else
 141                                                 inosused = 0;
 142                                         continue;
 143                                 }
 144                                 for (i = 1 << (CHAR_BIT - 1); i > 0; i >>= 1) {
 145                                         if (*cp & i)
 146                                                 break;
 147                                         inosused--;
 148                                 }
 149                                 break;
 150                         }
 151                 }
 152                 /*
 153                  * Allocate inoinfo structures for the allocated inodes.
 154                  */
 155                 inostathead[c].il_numalloced = inosused;
 156                 if (inosused == 0) {
 157                         inostathead[c].il_stat = NULL;
 158                         continue;
 159                 }
 160                 info = Calloc((unsigned)inosused, sizeof(struct inostat));
 161                 if (info == NULL)
 162                         errx(EEXIT, "cannot alloc %u bytes for inoinfo",
 163                             (unsigned)(sizeof(struct inostat) * inosused));
 164                 inostathead[c].il_stat = info;
 165                 /*
 166                  * Scan the allocated inodes.
 167                  */
 168                 for (i = 0; i < inosused; i++, inumber++) {
 169                         if (inumber < ROOTINO) {
 170                                 (void)getnextinode(inumber, rebuildcg);
 171                                 continue;
 172                         }
 173                         /*
 174                          * NULL return indicates probable end of allocated
 175                          * inodes during cylinder group rebuild attempt.
 176                          * We always keep trying until we get to the minimum
 177                          * valid number for this cylinder group.
 178                          */
 179                         if (checkinode(inumber, &idesc, rebuildcg) == 0 &&
 180                             i > cgp->cg_initediblk)
 181                                 break;
 182                 }
 183                 /*
 184                  * This optimization speeds up future runs of fsck
 185                  * by trimming down the number of inodes in cylinder
 186                  * groups that formerly had many inodes but now have
 187                  * fewer in use.
 188                  */
 189                 mininos = roundup(inosused + INOPB(&sblock), INOPB(&sblock));
 190                 if (inoopt && !preen && !rebuildcg &&
 191                     sblock.fs_magic == FS_UFS2_MAGIC &&
 192                     cgp->cg_initediblk > 2 * INOPB(&sblock) &&
 193                     mininos < cgp->cg_initediblk) {
 194                         i = cgp->cg_initediblk;
 195                         if (mininos < 2 * INOPB(&sblock))
 196                                 cgp->cg_initediblk = 2 * INOPB(&sblock);
 197                         else
 198                                 cgp->cg_initediblk = mininos;
 199                         pwarn("CYLINDER GROUP %d: RESET FROM %ju TO %d %s\n",
 200                             c, i, cgp->cg_initediblk, "VALID INODES");
 201                         dirty(cgbp);
 202                 }
 203                 if (inosused < sblock.fs_ipg)
 204                         continue;
 205                 lastino += 1;
 206                 if (lastino < (c * sblock.fs_ipg))
 207                         inosused = 0;
 208                 else
 209                         inosused = lastino - (c * sblock.fs_ipg);
 210                 if (rebuildcg && inosused > cgp->cg_initediblk &&
 211                     sblock.fs_magic == FS_UFS2_MAGIC) {
 212                         cgp->cg_initediblk = roundup(inosused, INOPB(&sblock));
 213                         pwarn("CYLINDER GROUP %d: FOUND %d VALID INODES\n", c,
 214                             cgp->cg_initediblk);
 215                 }
 216                 /*
 217                  * If we were not able to determine in advance which inodes
 218                  * were in use, then reduce the size of the inoinfo structure
 219                  * to the size necessary to describe the inodes that we
 220                  * really found.
 221                  */
 222                 if (inumber == lastino)
 223                         continue;
 224                 inostathead[c].il_numalloced = inosused;
 225                 if (inosused == 0) {
 226                         free(inostathead[c].il_stat);
 227                         inostathead[c].il_stat = NULL;
 228                         continue;
 229                 }
 230                 info = Calloc((unsigned)inosused, sizeof(struct inostat));
 231                 if (info == NULL)
 232                         errx(EEXIT, "cannot alloc %u bytes for inoinfo",
 233                             (unsigned)(sizeof(struct inostat) * inosused));
 234                 memmove(info, inostathead[c].il_stat, inosused * sizeof(*info));
 235                 free(inostathead[c].il_stat);
 236                 inostathead[c].il_stat = info;
 237         }
 238         freeinodebuf();
 239 }
 240
 241 static int
 242 checkinode(ino_t inumber, struct inodesc *idesc, int rebuildcg)
 243 {
 244         union dinode *dp;
 245         off_t kernmaxfilesize;
 246         ufs2_daddr_t ndb;
 247         mode_t mode;
 248         uintmax_t fixsize;
 249         int j, ret, offset;
 250
 251         if ((dp = getnextinode(inumber, rebuildcg)) == NULL)
 252                 return (0);
 253         mode = DIP(dp, di_mode) & IFMT;
 254         if (mode == 0) {
 255                 if ((sblock.fs_magic == FS_UFS1_MAGIC &&
 256                      (memcmp(dp->dp1.di_db, ufs1_zino.di_db,
 257                         NDADDR * sizeof(ufs1_daddr_t)) ||
 258                       memcmp(dp->dp1.di_ib, ufs1_zino.di_ib,
 259                         NIADDR * sizeof(ufs1_daddr_t)) ||
 260                       dp->dp1.di_mode || dp->dp1.di_size)) ||
 261                     (sblock.fs_magic == FS_UFS2_MAGIC &&
 262                      (memcmp(dp->dp2.di_db, ufs2_zino.di_db,
 263                         NDADDR * sizeof(ufs2_daddr_t)) ||
 264                       memcmp(dp->dp2.di_ib, ufs2_zino.di_ib,
 265                         NIADDR * sizeof(ufs2_daddr_t)) ||
 266                       dp->dp2.di_mode || dp->dp2.di_size))) {
 267                         pfatal("PARTIALLY ALLOCATED INODE I=%lu",
 268                             (u_long)inumber);
 269                         if (reply("CLEAR") == 1) {
 270                                 dp = ginode(inumber);
 271                                 clearinode(dp);
 272                                 inodirty(dp);
 273                         }
 274                 }
 275                 inoinfo(inumber)->ino_state = USTATE;
 276                 return (1);
 277         }
 278         lastino = inumber;
 279         /* This should match the file size limit in ffs_mountfs(). */
 280         if (sblock.fs_magic == FS_UFS1_MAGIC)
 281                 kernmaxfilesize = (off_t)0x40000000 * sblock.fs_bsize - 1;
 282         else
 283                 kernmaxfilesize = sblock.fs_maxfilesize;
 284         if (DIP(dp, di_size) > kernmaxfilesize ||
 285             DIP(dp, di_size) > sblock.fs_maxfilesize ||
 286             (mode == IFDIR && DIP(dp, di_size) > MAXDIRSIZE)) {
 287                 if (debug)
 288                         printf("bad size %ju:", (uintmax_t)DIP(dp, di_size));
 289                 goto unknown;
 290         }
 291         if (!preen && mode == IFMT && reply("HOLD BAD BLOCK") == 1) {
 292                 dp = ginode(inumber);
 293                 DIP_SET(dp, di_size, sblock.fs_fsize);
 294                 DIP_SET(dp, di_mode, IFREG|0600);
 295                 inodirty(dp);
 296         }
 297         if ((mode == IFBLK || mode == IFCHR || mode == IFIFO ||
 298              mode == IFSOCK) && DIP(dp, di_size) != 0) {
 299                 if (debug)
 300                         printf("bad special-file size %ju:",
 301                             (uintmax_t)DIP(dp, di_size));
 302                 goto unknown;
 303         }
 304         if ((mode == IFBLK || mode == IFCHR) &&
 305             (dev_t)DIP(dp, di_rdev) == NODEV) {
 306                 if (debug)
 307                         printf("bad special-file rdev NODEV:");
 308                 goto unknown;
 309         }
 310         ndb = howmany(DIP(dp, di_size), sblock.fs_bsize);
 311         if (ndb < 0) {
 312                 if (debug)
 313                         printf("bad size %ju ndb %ju:",
 314                                 (uintmax_t)DIP(dp, di_size), (uintmax_t)ndb);
 315                 goto unknown;
 316         }
 317         if (mode == IFBLK || mode == IFCHR)
 318                 ndb++;
 319         if (mode == IFLNK) {
 320                 /*
 321                  * Fake ndb value so direct/indirect block checks below
 322                  * will detect any garbage after symlink string.
 323                  */
 324                 if (DIP(dp, di_size) < (off_t)sblock.fs_maxsymlinklen) {
 325                         if (sblock.fs_magic == FS_UFS1_MAGIC)
 326                                 ndb = howmany(DIP(dp, di_size),
 327                                     sizeof(ufs1_daddr_t));
 328                         else
 329                                 ndb = howmany(DIP(dp, di_size),
 330                                     sizeof(ufs2_daddr_t));
 331                         if (ndb > NDADDR) {
 332                                 j = ndb - NDADDR;
 333                                 for (ndb = 1; j > 1; j--)
 334                                         ndb *= NINDIR(&sblock);
 335                                 ndb += NDADDR;
 336                         }
 337                 }
 338         }
 339         for (j = ndb; ndb < NDADDR && j < NDADDR; j++)
 340                 if (DIP(dp, di_db[j]) != 0) {
 341                         if (debug)
 342                                 printf("bad direct addr[%d]: %ju\n", j,
 343                                     (uintmax_t)DIP(dp, di_db[j]));
 344                         goto unknown;
 345                 }
 346         for (j = 0, ndb -= NDADDR; ndb > 0; j++)
 347                 ndb /= NINDIR(&sblock);
 348         for (; j < NIADDR; j++)
 349                 if (DIP(dp, di_ib[j]) != 0) {
 350                         if (debug)
 351                                 printf("bad indirect addr: %ju\n",
 352                                     (uintmax_t)DIP(dp, di_ib[j]));
 353                         goto unknown;
 354                 }
 355         if (ftypeok(dp) == 0)
 356                 goto unknown;
 357         n_files++;
 358         inoinfo(inumber)->ino_linkcnt = DIP(dp, di_nlink);
 359         if (mode == IFDIR) {
 360                 if (DIP(dp, di_size) == 0)
 361                         inoinfo(inumber)->ino_state = DCLEAR;
 362                 else if (DIP(dp, di_nlink) <= 0)
 363                         inoinfo(inumber)->ino_state = DZLINK;
 364                 else
 365                         inoinfo(inumber)->ino_state = DSTATE;
 366                 cacheino(dp, inumber);
 367                 countdirs++;
 368         } else if (DIP(dp, di_nlink) <= 0)
 369                 inoinfo(inumber)->ino_state = FZLINK;
 370         else
 371                 inoinfo(inumber)->ino_state = FSTATE;
 372         inoinfo(inumber)->ino_type = IFTODT(mode);
 373         badblk = dupblk = 0;
 374         idesc->id_number = inumber;
 375         if (DIP(dp, di_flags) & SF_SNAPSHOT)
 376                 idesc->id_type = SNAP;
 377         else
 378                 idesc->id_type = ADDR;
 379         (void)ckinode(dp, idesc);
 380         if (sblock.fs_magic == FS_UFS2_MAGIC && dp->dp2.di_extsize > 0) {
 381                 idesc->id_type = ADDR;
 382                 ndb = howmany(dp->dp2.di_extsize, sblock.fs_bsize);
 383                 for (j = 0; j < NXADDR; j++) {
 384                         if (--ndb == 0 &&
 385                             (offset = blkoff(&sblock, dp->dp2.di_extsize)) != 0)
 386                                 idesc->id_numfrags = numfrags(&sblock,
 387                                     fragroundup(&sblock, offset));
 388                         else
 389                                 idesc->id_numfrags = sblock.fs_frag;
 390                         if (dp->dp2.di_extb[j] == 0)
 391                                 continue;
 392                         idesc->id_blkno = dp->dp2.di_extb[j];
 393                         ret = (*idesc->id_func)(idesc);
 394                         if (ret & STOP)
 395                                 break;
 396                 }
 397         }
 398         if (sblock.fs_magic == FS_UFS2_MAGIC)
 399                 eascan(idesc, &dp->dp2);
 400         idesc->id_entryno *= btodb(sblock.fs_fsize);
 401         if (DIP(dp, di_blocks) != idesc->id_entryno) {
 402                 pwarn("INCORRECT BLOCK COUNT I=%lu (%ju should be %ju)",
 403                     (u_long)inumber, (uintmax_t)DIP(dp, di_blocks),
 404                     (uintmax_t)idesc->id_entryno);
 405                 if (preen)
 406                         printf(" (CORRECTED)\n");
 407                 else if (reply("CORRECT") == 0)
 408                         return (1);
 409                 if (bkgrdflag == 0) {
 410                         dp = ginode(inumber);
 411                         DIP_SET(dp, di_blocks, idesc->id_entryno);
 412                         inodirty(dp);
 413                 } else {
 414                         cmd.value = idesc->id_number;
 415                         cmd.size = idesc->id_entryno - DIP(dp, di_blocks);
 416                         if (debug)
 417                                 printf("adjblkcnt ino %ju amount %lld\n",
 418                                     (uintmax_t)cmd.value, (long long)cmd.size);
 419                         if (sysctl(adjblkcnt, MIBSIZE, 0, 0,
 420                             &cmd, sizeof cmd) == -1)
 421                                 rwerror("ADJUST INODE BLOCK COUNT", cmd.value);
 422                 }
 423         }
 424         /*
 425          * Soft updates will always ensure that the file size is correct
 426          * for files that contain only direct block pointers. However
 427          * soft updates does not roll back sizes for files with indirect
 428          * blocks that it has set to unallocated because their contents
 429          * have not yet been written to disk. Hence, the file can appear
 430          * to have a hole at its end because the block pointer has been
 431          * rolled back to zero. Thus, id_lballoc tracks the last allocated
 432          * block in the file. Here, for files that extend into indirect
 433          * blocks, we check for a size past the last allocated block of
 434          * the file and if that is found, shorten the file to reference
 435          * the last allocated block to avoid having it reference a hole
 436          * at its end.
 437          */
 438         if (DIP(dp, di_size) > NDADDR * sblock.fs_bsize &&
 439             idesc->id_lballoc < lblkno(&sblock, DIP(dp, di_size) - 1)) {
 440                 fixsize = lblktosize(&sblock, idesc->id_lballoc + 1);
 441                 pwarn("INODE %lu: FILE SIZE %ju BEYOND END OF ALLOCATED FILE, "
 442                       "SIZE SHOULD BE %ju", (u_long)inumber,
 443                       (uintmax_t)DIP(dp, di_size), fixsize);
 444                 if (preen)
 445                         printf(" (ADJUSTED)\n");
 446                 else if (reply("ADJUST") == 0)
 447                         return (1);
 448                 if (bkgrdflag == 0) {
 449                         dp = ginode(inumber);
 450                         DIP_SET(dp, di_size, fixsize);
 451                         inodirty(dp);
 452                 } else {
 453                         cmd.value = idesc->id_number;
 454                         cmd.size = fixsize;
 455                         if (debug)
 456                                 printf("setsize ino %ju size set to %ju\n",
 457                                     (uintmax_t)cmd.value, (uintmax_t)cmd.size);
 458                         if (sysctl(setsize, MIBSIZE, 0, 0,
 459                             &cmd, sizeof cmd) == -1)
 460                                 rwerror("SET INODE SIZE", cmd.value);
 461                 }
 462
 463         }
 464         return (1);
 465 unknown:
 466         pfatal("UNKNOWN FILE TYPE I=%lu", (u_long)inumber);
 467         inoinfo(inumber)->ino_state = FCLEAR;
 468         if (reply("CLEAR") == 1) {
 469                 inoinfo(inumber)->ino_state = USTATE;
 470                 dp = ginode(inumber);
 471                 clearinode(dp);
 472                 inodirty(dp);
 473         }
 474         return (1);
 475 }
 476
 477 int
 478 pass1check(struct inodesc *idesc)
 479 {
 480         int res = KEEPON;
 481         int anyout, nfrags;
 482         ufs2_daddr_t blkno = idesc->id_blkno;
 483         struct dups *dlp;
 484         struct dups *new;
 485
 486         if (idesc->id_type == SNAP) {
 487                 if (blkno == BLK_NOCOPY)
 488                         return (KEEPON);
 489                 if (idesc->id_number == cursnapshot) {
 490                         if (blkno == blkstofrags(&sblock, idesc->id_lbn))
 491                                 return (KEEPON);
 492                         if (blkno == BLK_SNAP) {
 493                                 blkno = blkstofrags(&sblock, idesc->id_lbn);
 494                                 idesc->id_entryno -= idesc->id_numfrags;
 495                         }
 496                 } else {
 497                         if (blkno == BLK_SNAP)
 498                                 return (KEEPON);
 499                 }
 500         }
 501         if ((anyout = chkrange(blkno, idesc->id_numfrags)) != 0) {
 502                 blkerror(idesc->id_number, "BAD", blkno);
 503                 if (badblk++ >= MAXBAD) {
 504                         pwarn("EXCESSIVE BAD BLKS I=%lu",
 505                             (u_long)idesc->id_number);
 506                         if (preen)
 507                                 printf(" (SKIPPING)\n");
 508                         else if (reply("CONTINUE") == 0) {
 509                                 ckfini(0);
 510                                 exit(EEXIT);
 511                         }
 512                         rerun = 1;
 513                         return (STOP);
 514                 }
 515         }
 516         for (nfrags = idesc->id_numfrags; nfrags > 0; blkno++, nfrags--) {
 517                 if (anyout && chkrange(blkno, 1)) {
 518                         res = SKIP;
 519                 } else if (!testbmap(blkno)) {
 520                         n_blks++;
 521                         setbmap(blkno);
 522                 } else {
 523                         blkerror(idesc->id_number, "DUP", blkno);
 524                         if (dupblk++ >= MAXDUP) {
 525                                 pwarn("EXCESSIVE DUP BLKS I=%lu",
 526                                         (u_long)idesc->id_number);
 527                                 if (preen)
 528                                         printf(" (SKIPPING)\n");
 529                                 else if (reply("CONTINUE") == 0) {
 530                                         ckfini(0);
 531                                         exit(EEXIT);
 532                                 }
 533                                 rerun = 1;
 534                                 return (STOP);
 535                         }
 536                         new = (struct dups *)Malloc(sizeof(struct dups));
 537                         if (new == NULL) {
 538                                 pfatal("DUP TABLE OVERFLOW.");
 539                                 if (reply("CONTINUE") == 0) {
 540                                         ckfini(0);
 541                                         exit(EEXIT);
 542                                 }
 543                                 rerun = 1;
 544                                 return (STOP);
 545                         }
 546                         new->dup = blkno;
 547                         if (muldup == NULL) {
 548                                 duplist = muldup = new;
 549                                 new->next = NULL;
 550                         } else {
 551                                 new->next = muldup->next;
 552                                 muldup->next = new;
 553                         }
 554                         for (dlp = duplist; dlp != muldup; dlp = dlp->next)
 555                                 if (dlp->dup == blkno)
 556                                         break;
 557                         if (dlp == muldup && dlp->dup != blkno)
 558                                 muldup = new;
 559                 }
 560                 /*
 561                  * count the number of blocks found in id_entryno
 562                  */
 563                 idesc->id_entryno++;
 564         }
 565         if (idesc->id_level == 0 && idesc->id_lballoc < idesc->id_lbn)
 566                 idesc->id_lballoc = idesc->id_lbn;
 567         return (res);
 568 }