sbin/fsck_ffs/pass2.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[] = "@(#)pass2.c       8.9 (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/sysctl.h>
  42
  43 #include <ufs/ufs/dinode.h>
  44 #include <ufs/ufs/dir.h>
  45 #include <ufs/ffs/fs.h>
  46
  47 #include <err.h>
  48 #include <errno.h>
  49 #include <stdint.h>
  50 #include <string.h>
  51
  52 #include "fsck.h"
  53
  54 #define MINDIRSIZE      (sizeof (struct dirtemplate))
  55
  56 static int fix_extraneous(struct inoinfo *, struct inodesc *);
  57 static int deleteentry(struct inodesc *);
  58 static int blksort(const void *, const void *);
  59 static int pass2check(struct inodesc *);
  60
  61 void
  62 pass2(void)
  63 {
  64         struct inode ip;
  65         union dinode *dp;
  66         struct inoinfo **inpp, *inp;
  67         struct inoinfo **inpend;
  68         struct inodesc curino;
  69         union dinode dino;
  70         int i;
  71         char pathbuf[MAXPATHLEN + 1];
  72
  73         switch (inoinfo(UFS_ROOTINO)->ino_state) {
  74
  75         case USTATE:
  76                 pfatal("ROOT INODE UNALLOCATED");
  77                 if (reply("ALLOCATE") == 0) {
  78                         ckfini(0);
  79                         exit(EEXIT);
  80                 }
  81                 if (allocdir(UFS_ROOTINO, UFS_ROOTINO, 0755) != UFS_ROOTINO)
  82                         errx(EEXIT, "CANNOT ALLOCATE ROOT INODE");
  83                 break;
  84
  85         case DCLEAR:
  86                 pfatal("DUPS/BAD IN ROOT INODE");
  87                 if (reply("REALLOCATE")) {
  88                         freeino(UFS_ROOTINO);
  89                         if (allocdir(UFS_ROOTINO, UFS_ROOTINO, 0755) !=
  90                             UFS_ROOTINO)
  91                                 errx(EEXIT, "CANNOT ALLOCATE ROOT INODE");
  92                         break;
  93                 }
  94                 if (reply("CONTINUE") == 0) {
  95                         ckfini(0);
  96                         exit(EEXIT);
  97                 }
  98                 break;
  99
 100         case FSTATE:
 101         case FCLEAR:
 102         case FZLINK:
 103                 pfatal("ROOT INODE NOT DIRECTORY");
 104                 if (reply("REALLOCATE")) {
 105                         freeino(UFS_ROOTINO);
 106                         if (allocdir(UFS_ROOTINO, UFS_ROOTINO, 0755) !=
 107                             UFS_ROOTINO)
 108                                 errx(EEXIT, "CANNOT ALLOCATE ROOT INODE");
 109                         break;
 110                 }
 111                 if (reply("FIX") == 0) {
 112                         ckfini(0);
 113                         exit(EEXIT);
 114                 }
 115                 ginode(UFS_ROOTINO, &ip);
 116                 dp = ip.i_dp;
 117                 DIP_SET(dp, di_mode, DIP(dp, di_mode) & ~IFMT);
 118                 DIP_SET(dp, di_mode, DIP(dp, di_mode) | IFDIR);
 119                 inodirty(&ip);
 120                 irelse(&ip);
 121                 break;
 122
 123         case DSTATE:
 124         case DZLINK:
 125                 break;
 126
 127         default:
 128                 errx(EEXIT, "BAD STATE %d FOR ROOT INODE",
 129                     inoinfo(UFS_ROOTINO)->ino_state);
 130         }
 131         inoinfo(UFS_ROOTINO)->ino_state = DFOUND;
 132         inoinfo(UFS_WINO)->ino_state = FSTATE;
 133         inoinfo(UFS_WINO)->ino_type = DT_WHT;
 134         /*
 135          * Sort the directory list into disk block order.
 136          */
 137         qsort((char *)inpsort, (size_t)inplast, sizeof *inpsort, blksort);
 138         /*
 139          * Check the integrity of each directory.
 140          */
 141         memset(&curino, 0, sizeof(struct inodesc));
 142         curino.id_type = DATA;
 143         curino.id_func = pass2check;
 144         inpend = &inpsort[inplast];
 145         for (inpp = inpsort; inpp < inpend; inpp++) {
 146                 if (got_siginfo) {
 147                         printf("%s: phase 2: dir %td of %d (%d%%)\n", cdevname,
 148                             inpp - inpsort, (int)inplast,
 149                             (int)((inpp - inpsort) * 100 / inplast));
 150                         got_siginfo = 0;
 151                 }
 152                 if (got_sigalarm) {
 153                         setproctitle("%s p2 %d%%", cdevname,
 154                             (int)((inpp - inpsort) * 100 / inplast));
 155                         got_sigalarm = 0;
 156                 }
 157                 inp = *inpp;
 158                 if (inp->i_isize == 0)
 159                         continue;
 160                 if (inp->i_isize < MINDIRSIZE) {
 161                         direrror(inp->i_number, "DIRECTORY TOO SHORT");
 162                         inp->i_isize = roundup(MINDIRSIZE, DIRBLKSIZ);
 163                         if (reply("FIX") == 1) {
 164                                 ginode(inp->i_number, &ip);
 165                                 DIP_SET(ip.i_dp, di_size, inp->i_isize);
 166                                 inodirty(&ip);
 167                                 irelse(&ip);
 168                         }
 169                 } else if ((inp->i_isize & (DIRBLKSIZ - 1)) != 0) {
 170                         getpathname(pathbuf, inp->i_number, inp->i_number);
 171                         if (usedsoftdep)
 172                                 pfatal("%s %s: LENGTH %jd NOT MULTIPLE OF %d",
 173                                         "DIRECTORY", pathbuf,
 174                                         (intmax_t)inp->i_isize, DIRBLKSIZ);
 175                         else
 176                                 pwarn("%s %s: LENGTH %jd NOT MULTIPLE OF %d",
 177                                         "DIRECTORY", pathbuf,
 178                                         (intmax_t)inp->i_isize, DIRBLKSIZ);
 179                         if (preen)
 180                                 printf(" (ADJUSTED)\n");
 181                         inp->i_isize = roundup(inp->i_isize, DIRBLKSIZ);
 182                         if (preen || reply("ADJUST") == 1) {
 183                                 ginode(inp->i_number, &ip);
 184                                 DIP_SET(ip.i_dp, di_size,
 185                                     roundup(inp->i_isize, DIRBLKSIZ));
 186                                 inodirty(&ip);
 187                                 irelse(&ip);
 188                         }
 189                 }
 190                 dp = &dino;
 191                 memset(dp, 0, sizeof(struct ufs2_dinode));
 192                 DIP_SET(dp, di_mode, IFDIR);
 193                 DIP_SET(dp, di_size, inp->i_isize);
 194                 for (i = 0; i < MIN(inp->i_numblks, UFS_NDADDR); i++)
 195                         DIP_SET(dp, di_db[i], inp->i_blks[i]);
 196                 if (inp->i_numblks > UFS_NDADDR)
 197                         for (i = 0; i < UFS_NIADDR; i++)
 198                                 DIP_SET(dp, di_ib[i],
 199                                     inp->i_blks[UFS_NDADDR + i]);
 200                 curino.id_number = inp->i_number;
 201                 curino.id_parent = inp->i_parent;
 202                 (void)ckinode(dp, &curino);
 203         }
 204         /*
 205          * Now that the parents of all directories have been found,
 206          * make another pass to verify the value of `..'
 207          */
 208         for (inpp = inpsort; inpp < inpend; inpp++) {
 209                 inp = *inpp;
 210                 if (inp->i_parent == 0 || inp->i_isize == 0)
 211                         continue;
 212                 if (inoinfo(inp->i_parent)->ino_state == DFOUND &&
 213                     INO_IS_DUNFOUND(inp->i_number))
 214                         inoinfo(inp->i_number)->ino_state = DFOUND;
 215                 if (inp->i_dotdot == inp->i_parent ||
 216                     inp->i_dotdot == (ino_t)-1)
 217                         continue;
 218                 if (inp->i_dotdot == 0) {
 219                         inp->i_dotdot = inp->i_parent;
 220                         fileerror(inp->i_parent, inp->i_number, "MISSING '..'");
 221                         if (reply("FIX") == 0)
 222                                 continue;
 223                         (void)makeentry(inp->i_number, inp->i_parent, "..");
 224                         inoinfo(inp->i_parent)->ino_linkcnt--;
 225                         continue;
 226                 }
 227                 /*
 228                  * Here we have:
 229                  *    inp->i_number is directory with bad ".." in it.
 230                  *    inp->i_dotdot is current value of "..".
 231                  *    inp->i_parent is directory to which ".." should point.
 232                  */
 233                 getpathname(pathbuf, inp->i_parent, inp->i_number);
 234                 printf("BAD INODE NUMBER FOR '..' in DIR I=%ju (%s)\n",
 235                     (uintmax_t)inp->i_number, pathbuf);
 236                 getpathname(pathbuf, inp->i_dotdot, inp->i_dotdot);
 237                 printf("CURRENTLY POINTS TO I=%ju (%s), ",
 238                     (uintmax_t)inp->i_dotdot, pathbuf);
 239                 getpathname(pathbuf, inp->i_parent, inp->i_parent);
 240                 printf("SHOULD POINT TO I=%ju (%s)",
 241                     (uintmax_t)inp->i_parent, pathbuf);
 242                 if (cursnapshot != 0) {
 243                         /*
 244                          * We need to:
 245                          *    setcwd(inp->i_number);
 246                          *    setdotdot(inp->i_dotdot, inp->i_parent);
 247                          */
 248                         cmd.value = inp->i_number;
 249                         if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 250                             &cmd, sizeof cmd) == -1) {
 251                                 /* kernel lacks support for these functions */
 252                                 printf(" (IGNORED)\n");
 253                                 continue;
 254                         }
 255                         cmd.value = inp->i_dotdot; /* verify same value */
 256                         cmd.size = inp->i_parent;  /* new parent */
 257                         if (sysctlbyname("vfs.ffs.setdotdot", 0, 0,
 258                             &cmd, sizeof cmd) == -1) {
 259                                 printf(" (FIX FAILED: %s)\n", strerror(errno));
 260                                 continue;
 261                         }
 262                         printf(" (FIXED)\n");
 263                         inoinfo(inp->i_parent)->ino_linkcnt--;
 264                         inp->i_dotdot = inp->i_parent;
 265                         continue;
 266                 }
 267                 if (preen)
 268                         printf(" (FIXED)\n");
 269                 else if (reply("FIX") == 0)
 270                         continue;
 271                 inoinfo(inp->i_dotdot)->ino_linkcnt++;
 272                 inoinfo(inp->i_parent)->ino_linkcnt--;
 273                 inp->i_dotdot = inp->i_parent;
 274                 (void)changeino(inp->i_number, "..", inp->i_parent);
 275         }
 276         /*
 277          * Mark all the directories that can be found from the root.
 278          */
 279         propagate();
 280 }
 281
 282 static int
 283 pass2check(struct inodesc *idesc)
 284 {
 285         struct direct *dirp = idesc->id_dirp;
 286         char dirname[MAXPATHLEN + 1];
 287         struct inoinfo *inp;
 288         int n, entrysize, ret = 0;
 289         struct inode ip;
 290         union dinode *dp;
 291         const char *errmsg;
 292         struct direct proto;
 293
 294         /*
 295          * check for "."
 296          */
 297         if (dirp->d_ino > maxino)
 298                 goto chk2;
 299         if (idesc->id_entryno != 0)
 300                 goto chk1;
 301         if (dirp->d_ino != 0 && strcmp(dirp->d_name, ".") == 0) {
 302                 if (dirp->d_ino != idesc->id_number) {
 303                         direrror(idesc->id_number, "BAD INODE NUMBER FOR '.'");
 304                         dirp->d_ino = idesc->id_number;
 305                         if (reply("FIX") == 1)
 306                                 ret |= ALTERED;
 307                 }
 308                 if (dirp->d_type != DT_DIR) {
 309                         direrror(idesc->id_number, "BAD TYPE VALUE FOR '.'");
 310                         dirp->d_type = DT_DIR;
 311                         if (reply("FIX") == 1)
 312                                 ret |= ALTERED;
 313                 }
 314                 goto chk1;
 315         }
 316         direrror(idesc->id_number, "MISSING '.'");
 317         proto.d_ino = idesc->id_number;
 318         proto.d_type = DT_DIR;
 319         proto.d_namlen = 1;
 320         (void)strcpy(proto.d_name, ".");
 321         entrysize = DIRSIZ(0, &proto);
 322         if (dirp->d_ino != 0 && strcmp(dirp->d_name, "..") != 0) {
 323                 pfatal("CANNOT FIX, FIRST ENTRY IN DIRECTORY CONTAINS %s\n",
 324                         dirp->d_name);
 325         } else if (dirp->d_reclen < entrysize) {
 326                 pfatal("CANNOT FIX, INSUFFICIENT SPACE TO ADD '.'\n");
 327         } else if (dirp->d_reclen < 2 * entrysize) {
 328                 proto.d_reclen = dirp->d_reclen;
 329                 memmove(dirp, &proto, (size_t)entrysize);
 330                 if (reply("FIX") == 1)
 331                         ret |= ALTERED;
 332         } else {
 333                 n = dirp->d_reclen - entrysize;
 334                 proto.d_reclen = entrysize;
 335                 memmove(dirp, &proto, (size_t)entrysize);
 336                 idesc->id_entryno++;
 337                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 338                 dirp = (struct direct *)((char *)(dirp) + entrysize);
 339                 memset(dirp, 0, (size_t)n);
 340                 dirp->d_reclen = n;
 341                 if (reply("FIX") == 1)
 342                         ret |= ALTERED;
 343         }
 344 chk1:
 345         if (idesc->id_entryno > 1)
 346                 goto chk2;
 347         inp = getinoinfo(idesc->id_number);
 348         proto.d_ino = inp->i_parent;
 349         proto.d_type = DT_DIR;
 350         proto.d_namlen = 2;
 351         (void)strcpy(proto.d_name, "..");
 352         entrysize = DIRSIZ(0, &proto);
 353         if (idesc->id_entryno == 0) {
 354                 n = DIRSIZ(0, dirp);
 355                 if (dirp->d_reclen < n + entrysize)
 356                         goto chk2;
 357                 proto.d_reclen = dirp->d_reclen - n;
 358                 dirp->d_reclen = n;
 359                 idesc->id_entryno++;
 360                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 361                 dirp = (struct direct *)((char *)(dirp) + n);
 362                 memset(dirp, 0, (size_t)proto.d_reclen);
 363                 dirp->d_reclen = proto.d_reclen;
 364         }
 365         if (dirp->d_ino != 0 && strcmp(dirp->d_name, "..") == 0) {
 366                 inp->i_dotdot = dirp->d_ino;
 367                 if (dirp->d_type != DT_DIR) {
 368                         direrror(idesc->id_number, "BAD TYPE VALUE FOR '..'");
 369                         dirp->d_type = DT_DIR;
 370                         if (reply("FIX") == 1)
 371                                 ret |= ALTERED;
 372                 }
 373                 goto chk2;
 374         }
 375         if (dirp->d_ino != 0 && strcmp(dirp->d_name, ".") != 0) {
 376                 fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
 377                 pfatal("CANNOT FIX, SECOND ENTRY IN DIRECTORY CONTAINS %s\n",
 378                         dirp->d_name);
 379                 inp->i_dotdot = (ino_t)-1;
 380         } else if (dirp->d_reclen < entrysize) {
 381                 fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
 382                 pfatal("CANNOT FIX, INSUFFICIENT SPACE TO ADD '..'\n");
 383                 inp->i_dotdot = (ino_t)-1;
 384         } else if (inp->i_parent != 0) {
 385                 /*
 386                  * We know the parent, so fix now.
 387                  */
 388                 inp->i_dotdot = inp->i_parent;
 389                 fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
 390                 proto.d_reclen = dirp->d_reclen;
 391                 memmove(dirp, &proto, (size_t)entrysize);
 392                 if (reply("FIX") == 1)
 393                         ret |= ALTERED;
 394         }
 395         idesc->id_entryno++;
 396         if (dirp->d_ino != 0)
 397                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 398         return (ret|KEEPON);
 399 chk2:
 400         if (dirp->d_ino == 0)
 401                 return (ret|KEEPON);
 402         if (dirp->d_namlen <= 2 &&
 403             dirp->d_name[0] == '.' &&
 404             idesc->id_entryno >= 2) {
 405                 if (dirp->d_namlen == 1) {
 406                         direrror(idesc->id_number, "EXTRA '.' ENTRY");
 407                         dirp->d_ino = 0;
 408                         if (reply("FIX") == 1)
 409                                 ret |= ALTERED;
 410                         return (KEEPON | ret);
 411                 }
 412                 if (dirp->d_name[1] == '.') {
 413                         direrror(idesc->id_number, "EXTRA '..' ENTRY");
 414                         dirp->d_ino = 0;
 415                         if (reply("FIX") == 1)
 416                                 ret |= ALTERED;
 417                         return (KEEPON | ret);
 418                 }
 419         }
 420         idesc->id_entryno++;
 421         n = 0;
 422         if (dirp->d_ino > maxino) {
 423                 fileerror(idesc->id_number, dirp->d_ino, "I OUT OF RANGE");
 424                 n = reply("REMOVE");
 425         } else if (((dirp->d_ino == UFS_WINO && dirp->d_type != DT_WHT) ||
 426                     (dirp->d_ino != UFS_WINO && dirp->d_type == DT_WHT))) {
 427                 fileerror(idesc->id_number, dirp->d_ino, "BAD WHITEOUT ENTRY");
 428                 dirp->d_ino = UFS_WINO;
 429                 dirp->d_type = DT_WHT;
 430                 if (reply("FIX") == 1)
 431                         ret |= ALTERED;
 432         } else {
 433 again:
 434                 switch (inoinfo(dirp->d_ino)->ino_state) {
 435                 case USTATE:
 436                         if (idesc->id_entryno <= 2)
 437                                 break;
 438                         fileerror(idesc->id_number, dirp->d_ino, "UNALLOCATED");
 439                         n = reply("REMOVE");
 440                         break;
 441
 442                 case DCLEAR:
 443                 case FCLEAR:
 444                         if (idesc->id_entryno <= 2)
 445                                 break;
 446                         if (inoinfo(dirp->d_ino)->ino_state == FCLEAR)
 447                                 errmsg = "DUP/BAD";
 448                         else if (!preen && !usedsoftdep)
 449                                 errmsg = "ZERO LENGTH DIRECTORY";
 450                         else if (cursnapshot == 0) {
 451                                 n = 1;
 452                                 break;
 453                         } else {
 454                                 getpathname(dirname, idesc->id_number,
 455                                     dirp->d_ino);
 456                                 pwarn("ZERO LENGTH DIRECTORY %s I=%ju",
 457                                     dirname, (uintmax_t)dirp->d_ino);
 458                                 /*
 459                                  * We need to:
 460                                  *    setcwd(idesc->id_parent);
 461                                  *    rmdir(dirp->d_name);
 462                                  */
 463                                 cmd.value = idesc->id_number;
 464                                 if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 465                                     &cmd, sizeof cmd) == -1) {
 466                                         /* kernel lacks support */
 467                                         printf(" (IGNORED)\n");
 468                                         n = 1;
 469                                         break;
 470                                 }
 471                                 if (rmdir(dirp->d_name) == -1) {
 472                                         printf(" (REMOVAL FAILED: %s)\n",
 473                                             strerror(errno));
 474                                         n = 1;
 475                                         break;
 476                                 }
 477                                 /* ".." reference to parent is removed */
 478                                 inoinfo(idesc->id_number)->ino_linkcnt--;
 479                                 printf(" (REMOVED)\n");
 480                                 break;
 481                         }
 482                         fileerror(idesc->id_number, dirp->d_ino, errmsg);
 483                         if ((n = reply("REMOVE")) == 1)
 484                                 break;
 485                         ginode(dirp->d_ino, &ip);
 486                         dp = ip.i_dp;
 487                         inoinfo(dirp->d_ino)->ino_state =
 488                            (DIP(dp, di_mode) & IFMT) == IFDIR ? DSTATE : FSTATE;
 489                         inoinfo(dirp->d_ino)->ino_linkcnt = DIP(dp, di_nlink);
 490                         irelse(&ip);
 491                         goto again;
 492
 493                 case DSTATE:
 494                 case DZLINK:
 495                         if (inoinfo(idesc->id_number)->ino_state == DFOUND)
 496                                 inoinfo(dirp->d_ino)->ino_state = DFOUND;
 497                         /* FALLTHROUGH */
 498
 499                 case DFOUND:
 500                         inp = getinoinfo(dirp->d_ino);
 501                         if (idesc->id_entryno > 2) {
 502                                 if (inp->i_parent == 0)
 503                                         inp->i_parent = idesc->id_number;
 504                                 else if ((n = fix_extraneous(inp, idesc)) == 1)
 505                                         break;
 506                         }
 507                         /* FALLTHROUGH */
 508
 509                 case FSTATE:
 510                 case FZLINK:
 511                         if (dirp->d_type != inoinfo(dirp->d_ino)->ino_type) {
 512                                 fileerror(idesc->id_number, dirp->d_ino,
 513                                     "BAD TYPE VALUE");
 514                                 dirp->d_type = inoinfo(dirp->d_ino)->ino_type;
 515                                 if (reply("FIX") == 1)
 516                                         ret |= ALTERED;
 517                         }
 518                         inoinfo(dirp->d_ino)->ino_linkcnt--;
 519                         break;
 520
 521                 default:
 522                         errx(EEXIT, "BAD STATE %d FOR INODE I=%ju",
 523                             inoinfo(dirp->d_ino)->ino_state,
 524                             (uintmax_t)dirp->d_ino);
 525                 }
 526         }
 527         if (n == 0)
 528                 return (ret|KEEPON);
 529         dirp->d_ino = 0;
 530         return (ret|KEEPON|ALTERED);
 531 }
 532
 533 static int
 534 fix_extraneous(struct inoinfo *inp, struct inodesc *idesc)
 535 {
 536         char *cp;
 537         struct inode ip;
 538         struct inodesc dotdesc;
 539         char oldname[MAXPATHLEN + 1];
 540         char newname[MAXPATHLEN + 1];
 541
 542         /*
 543          * If we have not yet found "..", look it up now so we know
 544          * which inode the directory itself believes is its parent.
 545          */
 546         if (inp->i_dotdot == 0) {
 547                 memset(&dotdesc, 0, sizeof(struct inodesc));
 548                 dotdesc.id_type = DATA;
 549                 dotdesc.id_number = idesc->id_dirp->d_ino;
 550                 dotdesc.id_func = findino;
 551                 dotdesc.id_name = strdup("..");
 552                 ginode(dotdesc.id_number, &ip);
 553                 if ((ckinode(ip.i_dp, &dotdesc) & FOUND))
 554                         inp->i_dotdot = dotdesc.id_parent;
 555                 irelse(&ip);
 556         }
 557         /*
 558          * We have the previously found old name (inp->i_parent) and the
 559          * just found new name (idesc->id_number). We have five cases:
 560          * 1)  ".." is missing - can remove either name, choose to delete
 561          *     new one and let fsck create ".." pointing to old name.
 562          * 2) Both new and old are in same directory, choose to delete
 563          *    the new name and let fsck fix ".." if it is wrong.
 564          * 3) ".." does not point to the new name, so delete it and let
 565          *    fsck fix ".." to point to the old one if it is wrong.
 566          * 4) ".." points to the old name only, so delete the new one.
 567          * 5) ".." points to the new name only, so delete the old one.
 568          *
 569          * For cases 1-4 we eliminate the new name;
 570          * for case 5 we eliminate the old name.
 571          */
 572         if (inp->i_dotdot == 0 ||                   /* Case 1 */
 573             idesc->id_number == inp->i_parent ||    /* Case 2 */
 574             inp->i_dotdot != idesc->id_number ||    /* Case 3 */
 575             inp->i_dotdot == inp->i_parent) {       /* Case 4 */
 576                 getpathname(newname, idesc->id_number, idesc->id_number);
 577                 if (strcmp(newname, "/") != 0)
 578                         strcat (newname, "/");
 579                 strcat(newname, idesc->id_dirp->d_name);
 580                 getpathname(oldname, inp->i_number, inp->i_number);
 581                 pwarn("%s IS AN EXTRANEOUS HARD LINK TO DIRECTORY %s",
 582                     newname, oldname);
 583                 if (cursnapshot != 0) {
 584                         /*
 585                          * We need to
 586                          *    setcwd(idesc->id_number);
 587                          *    unlink(idesc->id_dirp->d_name);
 588                          */
 589                         cmd.value = idesc->id_number;
 590                         if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 591                             &cmd, sizeof cmd) == -1) {
 592                                 printf(" (IGNORED)\n");
 593                                 return (0);
 594                         }
 595                         cmd.value = (intptr_t)idesc->id_dirp->d_name;
 596                         cmd.size = inp->i_number; /* verify same name */
 597                         if (sysctlbyname("vfs.ffs.unlink", 0, 0,
 598                             &cmd, sizeof cmd) == -1) {
 599                                 printf(" (UNLINK FAILED: %s)\n",
 600                                     strerror(errno));
 601                                 return (0);
 602                         }
 603                         printf(" (REMOVED)\n");
 604                         return (0);
 605                 }
 606                 if (preen) {
 607                         printf(" (REMOVED)\n");
 608                         return (1);
 609                 }
 610                 return (reply("REMOVE"));
 611         }
 612         /*
 613          * None of the first four cases above, so must be case (5).
 614          * Eliminate the old name and make the new the name the parent.
 615          */
 616         getpathname(oldname, inp->i_parent, inp->i_number);
 617         getpathname(newname, inp->i_number, inp->i_number);
 618         pwarn("%s IS AN EXTRANEOUS HARD LINK TO DIRECTORY %s", oldname,
 619             newname);
 620         if (cursnapshot != 0) {
 621                 /*
 622                  * We need to
 623                  *    setcwd(inp->i_parent);
 624                  *    unlink(last component of oldname pathname);
 625                  */
 626                 cmd.value = inp->i_parent;
 627                 if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 628                     &cmd, sizeof cmd) == -1) {
 629                         printf(" (IGNORED)\n");
 630                         return (0);
 631                 }
 632                 if ((cp = strchr(oldname, '/')) == NULL) {
 633                         printf(" (IGNORED)\n");
 634                         return (0);
 635                 }
 636                 cmd.value = (intptr_t)(cp + 1);
 637                 cmd.size = inp->i_number; /* verify same name */
 638                 if (sysctlbyname("vfs.ffs.unlink", 0, 0,
 639                     &cmd, sizeof cmd) == -1) {
 640                         printf(" (UNLINK FAILED: %s)\n",
 641                             strerror(errno));
 642                         return (0);
 643                 }
 644                 printf(" (REMOVED)\n");
 645                 inp->i_parent = idesc->id_number;  /* reparent to correct dir */
 646                 return (0);
 647         }
 648         if (!preen && !reply("REMOVE"))
 649                 return (0);
 650         memset(&dotdesc, 0, sizeof(struct inodesc));
 651         dotdesc.id_type = DATA;
 652         dotdesc.id_number = inp->i_parent; /* directory in which name appears */
 653         dotdesc.id_parent = inp->i_number; /* inode number in entry to delete */
 654         dotdesc.id_func = deleteentry;
 655         ginode(dotdesc.id_number, &ip);
 656         if ((ckinode(ip.i_dp, &dotdesc) & FOUND) && preen)
 657                 printf(" (REMOVED)\n");
 658         irelse(&ip);
 659         inp->i_parent = idesc->id_number;  /* reparent to correct directory */
 660         inoinfo(inp->i_number)->ino_linkcnt++; /* name gone, return reference */
 661         return (0);
 662 }
 663
 664 static int
 665 deleteentry(struct inodesc *idesc)
 666 {
 667         struct direct *dirp = idesc->id_dirp;
 668
 669         if (idesc->id_entryno++ < 2 || dirp->d_ino != idesc->id_parent)
 670                 return (KEEPON);
 671         dirp->d_ino = 0;
 672         return (ALTERED|STOP|FOUND);
 673 }
 674
 675 /*
 676  * Routine to sort disk blocks.
 677  */
 678 static int
 679 blksort(const void *arg1, const void *arg2)
 680 {
 681
 682         return ((*(struct inoinfo * const *)arg1)->i_blks[0] -
 683                 (*(struct inoinfo * const *)arg2)->i_blks[0]);
 684 }