sbin/fsck_ffs/pass2.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[] = "@(#)pass2.c       8.9 (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/sysctl.h>
  40
  41 #include <ufs/ufs/dinode.h>
  42 #include <ufs/ufs/dir.h>
  43 #include <ufs/ffs/fs.h>
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <stdint.h>
  48 #include <string.h>
  49
  50 #include "fsck.h"
  51
  52 #define MINDIRSIZE      (sizeof (struct dirtemplate))
  53
  54 static int fix_extraneous(struct inoinfo *, struct inodesc *);
  55 static int deleteentry(struct inodesc *);
  56 static int blksort(const void *, const void *);
  57 static int pass2check(struct inodesc *);
  58
  59 void
  60 pass2(void)
  61 {
  62         union dinode *dp;
  63         struct inoinfo **inpp, *inp;
  64         struct inoinfo **inpend;
  65         struct inodesc curino;
  66         union dinode dino;
  67         int i;
  68         char pathbuf[MAXPATHLEN + 1];
  69
  70         switch (inoinfo(ROOTINO)->ino_state) {
  71
  72         case USTATE:
  73                 pfatal("ROOT INODE UNALLOCATED");
  74                 if (reply("ALLOCATE") == 0) {
  75                         ckfini(0);
  76                         exit(EEXIT);
  77                 }
  78                 if (allocdir(ROOTINO, ROOTINO, 0755) != ROOTINO)
  79                         errx(EEXIT, "CANNOT ALLOCATE ROOT INODE");
  80                 break;
  81
  82         case DCLEAR:
  83                 pfatal("DUPS/BAD IN ROOT INODE");
  84                 if (reply("REALLOCATE")) {
  85                         freeino(ROOTINO);
  86                         if (allocdir(ROOTINO, ROOTINO, 0755) != ROOTINO)
  87                                 errx(EEXIT, "CANNOT ALLOCATE ROOT INODE");
  88                         break;
  89                 }
  90                 if (reply("CONTINUE") == 0) {
  91                         ckfini(0);
  92                         exit(EEXIT);
  93                 }
  94                 break;
  95
  96         case FSTATE:
  97         case FCLEAR:
  98         case FZLINK:
  99                 pfatal("ROOT INODE NOT DIRECTORY");
 100                 if (reply("REALLOCATE")) {
 101                         freeino(ROOTINO);
 102                         if (allocdir(ROOTINO, ROOTINO, 0755) != ROOTINO)
 103                                 errx(EEXIT, "CANNOT ALLOCATE ROOT INODE");
 104                         break;
 105                 }
 106                 if (reply("FIX") == 0) {
 107                         ckfini(0);
 108                         exit(EEXIT);
 109                 }
 110                 dp = ginode(ROOTINO);
 111                 DIP_SET(dp, di_mode, DIP(dp, di_mode) & ~IFMT);
 112                 DIP_SET(dp, di_mode, DIP(dp, di_mode) | IFDIR);
 113                 inodirty();
 114                 break;
 115
 116         case DSTATE:
 117         case DZLINK:
 118                 break;
 119
 120         default:
 121                 errx(EEXIT, "BAD STATE %d FOR ROOT INODE",
 122                     inoinfo(ROOTINO)->ino_state);
 123         }
 124         inoinfo(ROOTINO)->ino_state = DFOUND;
 125         inoinfo(WINO)->ino_state = FSTATE;
 126         inoinfo(WINO)->ino_type = DT_WHT;
 127         /*
 128          * Sort the directory list into disk block order.
 129          */
 130         qsort((char *)inpsort, (size_t)inplast, sizeof *inpsort, blksort);
 131         /*
 132          * Check the integrity of each directory.
 133          */
 134         memset(&curino, 0, sizeof(struct inodesc));
 135         curino.id_type = DATA;
 136         curino.id_func = pass2check;
 137         inpend = &inpsort[inplast];
 138         for (inpp = inpsort; inpp < inpend; inpp++) {
 139                 if (got_siginfo) {
 140                         printf("%s: phase 2: dir %td of %d (%d%%)\n", cdevname,
 141                             inpp - inpsort, (int)inplast,
 142                             (int)((inpp - inpsort) * 100 / inplast));
 143                         got_siginfo = 0;
 144                 }
 145                 if (got_sigalarm) {
 146                         setproctitle("%s p2 %d%%", cdevname,
 147                             (int)((inpp - inpsort) * 100 / inplast));
 148                         got_sigalarm = 0;
 149                 }
 150                 inp = *inpp;
 151                 if (inp->i_isize == 0)
 152                         continue;
 153                 if (inp->i_isize < MINDIRSIZE) {
 154                         direrror(inp->i_number, "DIRECTORY TOO SHORT");
 155                         inp->i_isize = roundup(MINDIRSIZE, DIRBLKSIZ);
 156                         if (reply("FIX") == 1) {
 157                                 dp = ginode(inp->i_number);
 158                                 DIP_SET(dp, di_size, inp->i_isize);
 159                                 inodirty();
 160                         }
 161                 } else if ((inp->i_isize & (DIRBLKSIZ - 1)) != 0) {
 162                         getpathname(pathbuf, inp->i_number, inp->i_number);
 163                         if (usedsoftdep)
 164                                 pfatal("%s %s: LENGTH %jd NOT MULTIPLE OF %d",
 165                                         "DIRECTORY", pathbuf,
 166                                         (intmax_t)inp->i_isize, DIRBLKSIZ);
 167                         else
 168                                 pwarn("%s %s: LENGTH %jd NOT MULTIPLE OF %d",
 169                                         "DIRECTORY", pathbuf,
 170                                         (intmax_t)inp->i_isize, DIRBLKSIZ);
 171                         if (preen)
 172                                 printf(" (ADJUSTED)\n");
 173                         inp->i_isize = roundup(inp->i_isize, DIRBLKSIZ);
 174                         if (preen || reply("ADJUST") == 1) {
 175                                 dp = ginode(inp->i_number);
 176                                 DIP_SET(dp, di_size,
 177                                     roundup(inp->i_isize, DIRBLKSIZ));
 178                                 inodirty();
 179                         }
 180                 }
 181                 dp = &dino;
 182                 memset(dp, 0, sizeof(struct ufs2_dinode));
 183                 DIP_SET(dp, di_mode, IFDIR);
 184                 DIP_SET(dp, di_size, inp->i_isize);
 185                 for (i = 0;
 186                      i < (inp->i_numblks<NDADDR ? inp->i_numblks : NDADDR);
 187                      i++)
 188                         DIP_SET(dp, di_db[i], inp->i_blks[i]);
 189                 if (inp->i_numblks > NDADDR)
 190                         for (i = 0; i < NIADDR; i++)
 191                                 DIP_SET(dp, di_ib[i], inp->i_blks[NDADDR + i]);
 192                 curino.id_number = inp->i_number;
 193                 curino.id_parent = inp->i_parent;
 194                 (void)ckinode(dp, &curino);
 195         }
 196         /*
 197          * Now that the parents of all directories have been found,
 198          * make another pass to verify the value of `..'
 199          */
 200         for (inpp = inpsort; inpp < inpend; inpp++) {
 201                 inp = *inpp;
 202                 if (inp->i_parent == 0 || inp->i_isize == 0)
 203                         continue;
 204                 if (inoinfo(inp->i_parent)->ino_state == DFOUND &&
 205                     INO_IS_DUNFOUND(inp->i_number))
 206                         inoinfo(inp->i_number)->ino_state = DFOUND;
 207                 if (inp->i_dotdot == inp->i_parent ||
 208                     inp->i_dotdot == (ino_t)-1)
 209                         continue;
 210                 if (inp->i_dotdot == 0) {
 211                         inp->i_dotdot = inp->i_parent;
 212                         fileerror(inp->i_parent, inp->i_number, "MISSING '..'");
 213                         if (reply("FIX") == 0)
 214                                 continue;
 215                         (void)makeentry(inp->i_number, inp->i_parent, "..");
 216                         inoinfo(inp->i_parent)->ino_linkcnt--;
 217                         continue;
 218                 }
 219                 /*
 220                  * Here we have:
 221                  *    inp->i_number is directory with bad ".." in it.
 222                  *    inp->i_dotdot is current value of "..".
 223                  *    inp->i_parent is directory to which ".." should point.
 224                  */
 225                 getpathname(pathbuf, inp->i_parent, inp->i_number);
 226                 printf("BAD INODE NUMBER FOR '..' in DIR I=%ju (%s)\n",
 227                     (uintmax_t)inp->i_number, pathbuf);
 228                 getpathname(pathbuf, inp->i_dotdot, inp->i_dotdot);
 229                 printf("CURRENTLY POINTS TO I=%ju (%s), ",
 230                     (uintmax_t)inp->i_dotdot, pathbuf);
 231                 getpathname(pathbuf, inp->i_parent, inp->i_parent);
 232                 printf("SHOULD POINT TO I=%ju (%s)",
 233                     (uintmax_t)inp->i_parent, pathbuf);
 234                 if (cursnapshot != 0) {
 235                         /*
 236                          * We need to:
 237                          *    setcwd(inp->i_number);
 238                          *    setdotdot(inp->i_dotdot, inp->i_parent);
 239                          */
 240                         cmd.value = inp->i_number;
 241                         if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 242                             &cmd, sizeof cmd) == -1) {
 243                                 /* kernel lacks support for these functions */
 244                                 printf(" (IGNORED)\n");
 245                                 continue;
 246                         }
 247                         cmd.value = inp->i_dotdot; /* verify same value */
 248                         cmd.size = inp->i_parent;  /* new parent */
 249                         if (sysctlbyname("vfs.ffs.setdotdot", 0, 0,
 250                             &cmd, sizeof cmd) == -1) {
 251                                 printf(" (FIX FAILED: %s)\n", strerror(errno));
 252                                 continue;
 253                         }
 254                         printf(" (FIXED)\n");
 255                         inoinfo(inp->i_parent)->ino_linkcnt--;
 256                         inp->i_dotdot = inp->i_parent;
 257                         continue;
 258                 }
 259                 if (preen)
 260                         printf(" (FIXED)\n");
 261                 else if (reply("FIX") == 0)
 262                         continue;
 263                 inoinfo(inp->i_dotdot)->ino_linkcnt++;
 264                 inoinfo(inp->i_parent)->ino_linkcnt--;
 265                 inp->i_dotdot = inp->i_parent;
 266                 (void)changeino(inp->i_number, "..", inp->i_parent);
 267         }
 268         /*
 269          * Mark all the directories that can be found from the root.
 270          */
 271         propagate();
 272 }
 273
 274 static int
 275 pass2check(struct inodesc *idesc)
 276 {
 277         struct direct *dirp = idesc->id_dirp;
 278         char dirname[MAXPATHLEN + 1];
 279         struct inoinfo *inp;
 280         int n, entrysize, ret = 0;
 281         union dinode *dp;
 282         const char *errmsg;
 283         struct direct proto;
 284
 285         /*
 286          * check for "."
 287          */
 288         if (dirp->d_ino > maxino)
 289                 goto chk2;
 290         if (idesc->id_entryno != 0)
 291                 goto chk1;
 292         if (dirp->d_ino != 0 && strcmp(dirp->d_name, ".") == 0) {
 293                 if (dirp->d_ino != idesc->id_number) {
 294                         direrror(idesc->id_number, "BAD INODE NUMBER FOR '.'");
 295                         dirp->d_ino = idesc->id_number;
 296                         if (reply("FIX") == 1)
 297                                 ret |= ALTERED;
 298                 }
 299                 if (dirp->d_type != DT_DIR) {
 300                         direrror(idesc->id_number, "BAD TYPE VALUE FOR '.'");
 301                         dirp->d_type = DT_DIR;
 302                         if (reply("FIX") == 1)
 303                                 ret |= ALTERED;
 304                 }
 305                 goto chk1;
 306         }
 307         direrror(idesc->id_number, "MISSING '.'");
 308         proto.d_ino = idesc->id_number;
 309         proto.d_type = DT_DIR;
 310         proto.d_namlen = 1;
 311         (void)strcpy(proto.d_name, ".");
 312         entrysize = DIRSIZ(0, &proto);
 313         if (dirp->d_ino != 0 && strcmp(dirp->d_name, "..") != 0) {
 314                 pfatal("CANNOT FIX, FIRST ENTRY IN DIRECTORY CONTAINS %s\n",
 315                         dirp->d_name);
 316         } else if (dirp->d_reclen < entrysize) {
 317                 pfatal("CANNOT FIX, INSUFFICIENT SPACE TO ADD '.'\n");
 318         } else if (dirp->d_reclen < 2 * entrysize) {
 319                 proto.d_reclen = dirp->d_reclen;
 320                 memmove(dirp, &proto, (size_t)entrysize);
 321                 if (reply("FIX") == 1)
 322                         ret |= ALTERED;
 323         } else {
 324                 n = dirp->d_reclen - entrysize;
 325                 proto.d_reclen = entrysize;
 326                 memmove(dirp, &proto, (size_t)entrysize);
 327                 idesc->id_entryno++;
 328                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 329                 dirp = (struct direct *)((char *)(dirp) + entrysize);
 330                 memset(dirp, 0, (size_t)n);
 331                 dirp->d_reclen = n;
 332                 if (reply("FIX") == 1)
 333                         ret |= ALTERED;
 334         }
 335 chk1:
 336         if (idesc->id_entryno > 1)
 337                 goto chk2;
 338         inp = getinoinfo(idesc->id_number);
 339         proto.d_ino = inp->i_parent;
 340         proto.d_type = DT_DIR;
 341         proto.d_namlen = 2;
 342         (void)strcpy(proto.d_name, "..");
 343         entrysize = DIRSIZ(0, &proto);
 344         if (idesc->id_entryno == 0) {
 345                 n = DIRSIZ(0, dirp);
 346                 if (dirp->d_reclen < n + entrysize)
 347                         goto chk2;
 348                 proto.d_reclen = dirp->d_reclen - n;
 349                 dirp->d_reclen = n;
 350                 idesc->id_entryno++;
 351                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 352                 dirp = (struct direct *)((char *)(dirp) + n);
 353                 memset(dirp, 0, (size_t)proto.d_reclen);
 354                 dirp->d_reclen = proto.d_reclen;
 355         }
 356         if (dirp->d_ino != 0 && strcmp(dirp->d_name, "..") == 0) {
 357                 inp->i_dotdot = dirp->d_ino;
 358                 if (dirp->d_type != DT_DIR) {
 359                         direrror(idesc->id_number, "BAD TYPE VALUE FOR '..'");
 360                         dirp->d_type = DT_DIR;
 361                         if (reply("FIX") == 1)
 362                                 ret |= ALTERED;
 363                 }
 364                 goto chk2;
 365         }
 366         if (dirp->d_ino != 0 && strcmp(dirp->d_name, ".") != 0) {
 367                 fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
 368                 pfatal("CANNOT FIX, SECOND ENTRY IN DIRECTORY CONTAINS %s\n",
 369                         dirp->d_name);
 370                 inp->i_dotdot = (ino_t)-1;
 371         } else if (dirp->d_reclen < entrysize) {
 372                 fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
 373                 pfatal("CANNOT FIX, INSUFFICIENT SPACE TO ADD '..'\n");
 374                 inp->i_dotdot = (ino_t)-1;
 375         } else if (inp->i_parent != 0) {
 376                 /*
 377                  * We know the parent, so fix now.
 378                  */
 379                 inp->i_dotdot = inp->i_parent;
 380                 fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
 381                 proto.d_reclen = dirp->d_reclen;
 382                 memmove(dirp, &proto, (size_t)entrysize);
 383                 if (reply("FIX") == 1)
 384                         ret |= ALTERED;
 385         }
 386         idesc->id_entryno++;
 387         if (dirp->d_ino != 0)
 388                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 389         return (ret|KEEPON);
 390 chk2:
 391         if (dirp->d_ino == 0)
 392                 return (ret|KEEPON);
 393         if (dirp->d_namlen <= 2 &&
 394             dirp->d_name[0] == '.' &&
 395             idesc->id_entryno >= 2) {
 396                 if (dirp->d_namlen == 1) {
 397                         direrror(idesc->id_number, "EXTRA '.' ENTRY");
 398                         dirp->d_ino = 0;
 399                         if (reply("FIX") == 1)
 400                                 ret |= ALTERED;
 401                         return (KEEPON | ret);
 402                 }
 403                 if (dirp->d_name[1] == '.') {
 404                         direrror(idesc->id_number, "EXTRA '..' ENTRY");
 405                         dirp->d_ino = 0;
 406                         if (reply("FIX") == 1)
 407                                 ret |= ALTERED;
 408                         return (KEEPON | ret);
 409                 }
 410         }
 411         idesc->id_entryno++;
 412         n = 0;
 413         if (dirp->d_ino > maxino) {
 414                 fileerror(idesc->id_number, dirp->d_ino, "I OUT OF RANGE");
 415                 n = reply("REMOVE");
 416         } else if (((dirp->d_ino == WINO && dirp->d_type != DT_WHT) ||
 417                     (dirp->d_ino != WINO && dirp->d_type == DT_WHT))) {
 418                 fileerror(idesc->id_number, dirp->d_ino, "BAD WHITEOUT ENTRY");
 419                 dirp->d_ino = WINO;
 420                 dirp->d_type = DT_WHT;
 421                 if (reply("FIX") == 1)
 422                         ret |= ALTERED;
 423         } else {
 424 again:
 425                 switch (inoinfo(dirp->d_ino)->ino_state) {
 426                 case USTATE:
 427                         if (idesc->id_entryno <= 2)
 428                                 break;
 429                         fileerror(idesc->id_number, dirp->d_ino, "UNALLOCATED");
 430                         n = reply("REMOVE");
 431                         break;
 432
 433                 case DCLEAR:
 434                 case FCLEAR:
 435                         if (idesc->id_entryno <= 2)
 436                                 break;
 437                         if (inoinfo(dirp->d_ino)->ino_state == FCLEAR)
 438                                 errmsg = "DUP/BAD";
 439                         else if (!preen && !usedsoftdep)
 440                                 errmsg = "ZERO LENGTH DIRECTORY";
 441                         else if (cursnapshot == 0) {
 442                                 n = 1;
 443                                 break;
 444                         } else {
 445                                 getpathname(dirname, idesc->id_number,
 446                                     dirp->d_ino);
 447                                 pwarn("ZERO LENGTH DIRECTORY %s I=%ju",
 448                                     dirname, (uintmax_t)dirp->d_ino);
 449                                 /*
 450                                  * We need to:
 451                                  *    setcwd(idesc->id_parent);
 452                                  *    rmdir(dirp->d_name);
 453                                  */
 454                                 cmd.value = idesc->id_number;
 455                                 if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 456                                     &cmd, sizeof cmd) == -1) {
 457                                         /* kernel lacks support */
 458                                         printf(" (IGNORED)\n");
 459                                         n = 1;
 460                                         break;
 461                                 }
 462                                 if (rmdir(dirp->d_name) == -1) {
 463                                         printf(" (REMOVAL FAILED: %s)\n",
 464                                             strerror(errno));
 465                                         n = 1;
 466                                         break;
 467                                 }
 468                                 /* ".." reference to parent is removed */
 469                                 inoinfo(idesc->id_number)->ino_linkcnt--;
 470                                 printf(" (REMOVED)\n");
 471                                 break;
 472                         }
 473                         fileerror(idesc->id_number, dirp->d_ino, errmsg);
 474                         if ((n = reply("REMOVE")) == 1)
 475                                 break;
 476                         dp = ginode(dirp->d_ino);
 477                         inoinfo(dirp->d_ino)->ino_state =
 478                            (DIP(dp, di_mode) & IFMT) == IFDIR ? DSTATE : FSTATE;
 479                         inoinfo(dirp->d_ino)->ino_linkcnt = DIP(dp, di_nlink);
 480                         goto again;
 481
 482                 case DSTATE:
 483                 case DZLINK:
 484                         if (inoinfo(idesc->id_number)->ino_state == DFOUND)
 485                                 inoinfo(dirp->d_ino)->ino_state = DFOUND;
 486                         /* FALLTHROUGH */
 487
 488                 case DFOUND:
 489                         inp = getinoinfo(dirp->d_ino);
 490                         if (idesc->id_entryno > 2) {
 491                                 if (inp->i_parent == 0)
 492                                         inp->i_parent = idesc->id_number;
 493                                 else if ((n = fix_extraneous(inp, idesc)) == 1)
 494                                         break;
 495                         }
 496                         /* FALLTHROUGH */
 497
 498                 case FSTATE:
 499                 case FZLINK:
 500                         if (dirp->d_type != inoinfo(dirp->d_ino)->ino_type) {
 501                                 fileerror(idesc->id_number, dirp->d_ino,
 502                                     "BAD TYPE VALUE");
 503                                 dirp->d_type = inoinfo(dirp->d_ino)->ino_type;
 504                                 if (reply("FIX") == 1)
 505                                         ret |= ALTERED;
 506                         }
 507                         inoinfo(dirp->d_ino)->ino_linkcnt--;
 508                         break;
 509
 510                 default:
 511                         errx(EEXIT, "BAD STATE %d FOR INODE I=%ju",
 512                             inoinfo(dirp->d_ino)->ino_state,
 513                             (uintmax_t)dirp->d_ino);
 514                 }
 515         }
 516         if (n == 0)
 517                 return (ret|KEEPON);
 518         dirp->d_ino = 0;
 519         return (ret|KEEPON|ALTERED);
 520 }
 521
 522 static int
 523 fix_extraneous(struct inoinfo *inp, struct inodesc *idesc)
 524 {
 525         char *cp;
 526         struct inodesc dotdesc;
 527         char oldname[MAXPATHLEN + 1];
 528         char newname[MAXPATHLEN + 1];
 529
 530         /*
 531          * If we have not yet found "..", look it up now so we know
 532          * which inode the directory itself believes is its parent.
 533          */
 534         if (inp->i_dotdot == 0) {
 535                 memset(&dotdesc, 0, sizeof(struct inodesc));
 536                 dotdesc.id_type = DATA;
 537                 dotdesc.id_number = idesc->id_dirp->d_ino;
 538                 dotdesc.id_func = findino;
 539                 dotdesc.id_name = strdup("..");
 540                 if ((ckinode(ginode(dotdesc.id_number), &dotdesc) & FOUND))
 541                         inp->i_dotdot = dotdesc.id_parent;
 542         }
 543         /*
 544          * We have the previously found old name (inp->i_parent) and the
 545          * just found new name (idesc->id_number). We have five cases:
 546          * 1)  ".." is missing - can remove either name, choose to delete
 547          *     new one and let fsck create ".." pointing to old name.
 548          * 2) Both new and old are in same directory, choose to delete
 549          *    the new name and let fsck fix ".." if it is wrong.
 550          * 3) ".." does not point to the new name, so delete it and let
 551          *    fsck fix ".." to point to the old one if it is wrong.
 552          * 4) ".." points to the old name only, so delete the new one.
 553          * 5) ".." points to the new name only, so delete the old one.
 554          *
 555          * For cases 1-4 we eliminate the new name;
 556          * for case 5 we eliminate the old name.
 557          */
 558         if (inp->i_dotdot == 0 ||                   /* Case 1 */
 559             idesc->id_number == inp->i_parent ||    /* Case 2 */
 560             inp->i_dotdot != idesc->id_number ||    /* Case 3 */
 561             inp->i_dotdot == inp->i_parent) {       /* Case 4 */
 562                 getpathname(newname, idesc->id_number, idesc->id_number);
 563                 if (strcmp(newname, "/") != 0)
 564                         strcat (newname, "/");
 565                 strcat(newname, idesc->id_dirp->d_name);
 566                 getpathname(oldname, inp->i_number, inp->i_number);
 567                 pwarn("%s IS AN EXTRANEOUS HARD LINK TO DIRECTORY %s",
 568                     newname, oldname);
 569                 if (cursnapshot != 0) {
 570                         /*
 571                          * We need to
 572                          *    setcwd(idesc->id_number);
 573                          *    unlink(idesc->id_dirp->d_name);
 574                          */
 575                         cmd.value = idesc->id_number;
 576                         if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 577                             &cmd, sizeof cmd) == -1) {
 578                                 printf(" (IGNORED)\n");
 579                                 return (0);
 580                         }
 581                         cmd.value = (intptr_t)idesc->id_dirp->d_name;
 582                         cmd.size = inp->i_number; /* verify same name */
 583                         if (sysctlbyname("vfs.ffs.unlink", 0, 0,
 584                             &cmd, sizeof cmd) == -1) {
 585                                 printf(" (UNLINK FAILED: %s)\n",
 586                                     strerror(errno));
 587                                 return (0);
 588                         }
 589                         printf(" (REMOVED)\n");
 590                         return (0);
 591                 }
 592                 if (preen) {
 593                         printf(" (REMOVED)\n");
 594                         return (1);
 595                 }
 596                 return (reply("REMOVE"));
 597         }
 598         /*
 599          * None of the first four cases above, so must be case (5).
 600          * Eliminate the old name and make the new the name the parent.
 601          */
 602         getpathname(oldname, inp->i_parent, inp->i_number);
 603         getpathname(newname, inp->i_number, inp->i_number);
 604         pwarn("%s IS AN EXTRANEOUS HARD LINK TO DIRECTORY %s", oldname,
 605             newname);
 606         if (cursnapshot != 0) {
 607                 /*
 608                  * We need to
 609                  *    setcwd(inp->i_parent);
 610                  *    unlink(last component of oldname pathname);
 611                  */
 612                 cmd.value = inp->i_parent;
 613                 if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 614                     &cmd, sizeof cmd) == -1) {
 615                         printf(" (IGNORED)\n");
 616                         return (0);
 617                 }
 618                 if ((cp = strchr(oldname, '/')) == NULL) {
 619                         printf(" (IGNORED)\n");
 620                         return (0);
 621                 }
 622                 cmd.value = (intptr_t)(cp + 1);
 623                 cmd.size = inp->i_number; /* verify same name */
 624                 if (sysctlbyname("vfs.ffs.unlink", 0, 0,
 625                     &cmd, sizeof cmd) == -1) {
 626                         printf(" (UNLINK FAILED: %s)\n",
 627                             strerror(errno));
 628                         return (0);
 629                 }
 630                 printf(" (REMOVED)\n");
 631                 inp->i_parent = idesc->id_number;  /* reparent to correct dir */
 632                 return (0);
 633         }
 634         if (!preen && !reply("REMOVE"))
 635                 return (0);
 636         memset(&dotdesc, 0, sizeof(struct inodesc));
 637         dotdesc.id_type = DATA;
 638         dotdesc.id_number = inp->i_parent; /* directory in which name appears */
 639         dotdesc.id_parent = inp->i_number; /* inode number in entry to delete */
 640         dotdesc.id_func = deleteentry;
 641         if ((ckinode(ginode(dotdesc.id_number), &dotdesc) & FOUND) && preen)
 642                 printf(" (REMOVED)\n");
 643         inp->i_parent = idesc->id_number;  /* reparent to correct directory */
 644         inoinfo(inp->i_number)->ino_linkcnt++; /* name gone, return reference */
 645         return (0);
 646 }
 647
 648 static int
 649 deleteentry(struct inodesc *idesc)
 650 {
 651         struct direct *dirp = idesc->id_dirp;
 652
 653         if (idesc->id_entryno++ < 2 || dirp->d_ino != idesc->id_parent)
 654                 return (KEEPON);
 655         dirp->d_ino = 0;
 656         return (ALTERED|STOP|FOUND);
 657 }
 658
 659 /*
 660  * Routine to sort disk blocks.
 661  */
 662 static int
 663 blksort(const void *arg1, const void *arg2)
 664 {
 665
 666         return ((*(struct inoinfo * const *)arg1)->i_blks[0] -
 667                 (*(struct inoinfo * const *)arg2)->i_blks[0]);
 668 }