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                         if (debug)
 221                                 fileerror(inp->i_parent, inp->i_number,
 222                                     "DEFERRED MISSING '..' FIX");
 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, *newdirp;
 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                         if (reply("FIX") == 1) {
 305                                 dirp->d_ino = idesc->id_number;
 306                                 ret |= ALTERED;
 307                         }
 308                 }
 309                 if (dirp->d_type != DT_DIR) {
 310                         direrror(idesc->id_number, "BAD TYPE VALUE FOR '.'");
 311                         if (reply("FIX") == 1) {
 312                                 dirp->d_type = DT_DIR;
 313                                 ret |= ALTERED;
 314                         }
 315                 }
 316                 goto chk1;
 317         }
 318         proto.d_ino = idesc->id_number;
 319         proto.d_type = DT_DIR;
 320         proto.d_namlen = 1;
 321         (void)strcpy(proto.d_name, ".");
 322         entrysize = DIRSIZ(0, &proto);
 323         direrror(idesc->id_number, "MISSING '.'");
 324         errmsg = "ADD '.' ENTRY";
 325         if (dirp->d_reclen < entrysize + DIRSIZ(0, dirp)) {
 326                 /* Not enough space to add '.', replace first entry with '.' */
 327                 if (dirp->d_ino != 0) {
 328                         pwarn("\nFIRST ENTRY IN DIRECTORY CONTAINS %s\n",
 329                              dirp->d_name);
 330                         errmsg = "REPLACE WITH '.'";
 331                 }
 332                 if (reply(errmsg) == 0)
 333                         goto chk1;
 334                 proto.d_reclen = dirp->d_reclen;
 335                 memmove(dirp, &proto, (size_t)entrysize);
 336                 ret |= ALTERED;
 337         } else {
 338                 /* Move over first entry and add '.' entry */
 339                 if (reply(errmsg) == 0)
 340                         goto chk1;
 341                 newdirp = (struct direct *)((char *)(dirp) + entrysize);
 342                 dirp->d_reclen -= entrysize;
 343                 memmove(newdirp, dirp, dirp->d_reclen);
 344                 proto.d_reclen = entrysize;
 345                 memmove(dirp, &proto, (size_t)entrysize);
 346                 idesc->id_entryno++;
 347                 inoinfo(idesc->id_number)->ino_linkcnt--;
 348                 dirp = newdirp;
 349                 ret |= ALTERED;
 350         }
 351 chk1:
 352         if (idesc->id_entryno > 1)
 353                 goto chk2;
 354         inp = getinoinfo(idesc->id_number);
 355         proto.d_ino = inp->i_parent;
 356         proto.d_type = DT_DIR;
 357         proto.d_namlen = 2;
 358         (void)strcpy(proto.d_name, "..");
 359         entrysize = DIRSIZ(0, &proto);
 360         if (idesc->id_entryno == 0) {
 361                 n = DIRSIZ(0, dirp);
 362                 if (dirp->d_reclen < n + entrysize)
 363                         goto chk2;
 364                 proto.d_reclen = dirp->d_reclen - n;
 365                 dirp->d_reclen = n;
 366                 idesc->id_entryno++;
 367                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 368                 dirp = (struct direct *)((char *)(dirp) + n);
 369                 memset(dirp, 0, (size_t)proto.d_reclen);
 370                 dirp->d_reclen = proto.d_reclen;
 371         }
 372         if (dirp->d_ino != 0 && strcmp(dirp->d_name, "..") == 0) {
 373                 inp->i_dotdot = dirp->d_ino;
 374                 if (dirp->d_type != DT_DIR) {
 375                         direrror(idesc->id_number, "BAD TYPE VALUE FOR '..'");
 376                         dirp->d_type = DT_DIR;
 377                         if (reply("FIX") == 1)
 378                                 ret |= ALTERED;
 379                 }
 380                 goto chk2;
 381         }
 382         fileerror(inp->i_parent != 0 ? inp->i_parent : idesc->id_number,
 383             idesc->id_number, "MISSING '..'");
 384         errmsg = "ADD '..' ENTRY";
 385         if (dirp->d_reclen < entrysize + DIRSIZ(0, dirp)) {
 386                 /* No space to add '..', replace second entry with '..' */
 387                 if (dirp->d_ino != 0) {
 388                         pfatal("SECOND ENTRY IN DIRECTORY CONTAINS %s\n",
 389                             dirp->d_name);
 390                         errmsg = "REPLACE WITH '..'";
 391                 }
 392                 if (reply(errmsg) == 0) {
 393                         inp->i_dotdot = (ino_t)-1;
 394                         goto chk2;
 395                 }
 396                 if (proto.d_ino == 0) {
 397                         /* Defer processing until parent known */
 398                         idesc->id_entryno++;
 399                         if (debug)
 400                                 printf("(FIX DEFERRED)\n");
 401                 }
 402                 inp->i_dotdot = proto.d_ino;
 403                 proto.d_reclen = dirp->d_reclen;
 404                 memmove(dirp, &proto, (size_t)entrysize);
 405                 ret |= ALTERED;
 406         } else {
 407                 /* Move over second entry and add '..' entry */
 408                 if (reply(errmsg) == 0) {
 409                         inp->i_dotdot = (ino_t)-1;
 410                         goto chk2;
 411                 }
 412                 if (proto.d_ino == 0) {
 413                         /* Defer processing until parent known */
 414                         idesc->id_entryno++;
 415                         if (debug)
 416                                 printf("(FIX DEFERRED)\n");
 417                 }
 418                 inp->i_dotdot = proto.d_ino;
 419                 if (dirp->d_ino == 0) {
 420                         proto.d_reclen = dirp->d_reclen;
 421                         memmove(dirp, &proto, (size_t)entrysize);
 422                 } else {
 423                         newdirp = (struct direct *)((char *)(dirp) + entrysize);
 424                         dirp->d_reclen -= entrysize;
 425                         memmove(newdirp, dirp, dirp->d_reclen);
 426                         proto.d_reclen = entrysize;
 427                         memmove(dirp, &proto, (size_t)entrysize);
 428                         if (dirp->d_ino != 0) {
 429                                 idesc->id_entryno++;
 430                                 inoinfo(dirp->d_ino)->ino_linkcnt--;
 431                         }
 432                         dirp = newdirp;
 433                 }
 434                 ret |= ALTERED;
 435         }
 436 chk2:
 437         if (dirp->d_ino == 0)
 438                 return (ret|KEEPON);
 439         if (dirp->d_namlen <= 2 &&
 440             dirp->d_name[0] == '.' &&
 441             idesc->id_entryno >= 2) {
 442                 if (dirp->d_namlen == 1) {
 443                         direrror(idesc->id_number, "EXTRA '.' ENTRY");
 444                         dirp->d_ino = 0;
 445                         if (reply("FIX") == 1)
 446                                 ret |= ALTERED;
 447                         return (KEEPON | ret);
 448                 }
 449                 if (dirp->d_name[1] == '.') {
 450                         direrror(idesc->id_number, "EXTRA '..' ENTRY");
 451                         dirp->d_ino = 0;
 452                         if (reply("FIX") == 1)
 453                                 ret |= ALTERED;
 454                         return (KEEPON | ret);
 455                 }
 456         }
 457         idesc->id_entryno++;
 458         n = 0;
 459         if (dirp->d_ino > maxino) {
 460                 fileerror(idesc->id_number, dirp->d_ino, "I OUT OF RANGE");
 461                 n = reply("REMOVE");
 462         } else if (((dirp->d_ino == UFS_WINO && dirp->d_type != DT_WHT) ||
 463                     (dirp->d_ino != UFS_WINO && dirp->d_type == DT_WHT))) {
 464                 fileerror(idesc->id_number, dirp->d_ino, "BAD WHITEOUT ENTRY");
 465                 dirp->d_ino = UFS_WINO;
 466                 dirp->d_type = DT_WHT;
 467                 if (reply("FIX") == 1)
 468                         ret |= ALTERED;
 469         } else {
 470 again:
 471                 switch (inoinfo(dirp->d_ino)->ino_state) {
 472                 case USTATE:
 473                         if (idesc->id_entryno <= 2)
 474                                 break;
 475                         fileerror(idesc->id_number, dirp->d_ino, "UNALLOCATED");
 476                         n = reply("REMOVE");
 477                         break;
 478
 479                 case DCLEAR:
 480                 case FCLEAR:
 481                         if (idesc->id_entryno <= 2)
 482                                 break;
 483                         if (inoinfo(dirp->d_ino)->ino_state == FCLEAR)
 484                                 errmsg = "DUP/BAD";
 485                         else if (!preen && !usedsoftdep)
 486                                 errmsg = "ZERO LENGTH DIRECTORY";
 487                         else if (cursnapshot == 0) {
 488                                 n = 1;
 489                                 break;
 490                         } else {
 491                                 getpathname(dirname, idesc->id_number,
 492                                     dirp->d_ino);
 493                                 pwarn("ZERO LENGTH DIRECTORY %s I=%ju",
 494                                     dirname, (uintmax_t)dirp->d_ino);
 495                                 /*
 496                                  * We need to:
 497                                  *    setcwd(idesc->id_parent);
 498                                  *    rmdir(dirp->d_name);
 499                                  */
 500                                 cmd.value = idesc->id_number;
 501                                 if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 502                                     &cmd, sizeof cmd) == -1) {
 503                                         /* kernel lacks support */
 504                                         printf(" (IGNORED)\n");
 505                                         n = 1;
 506                                         break;
 507                                 }
 508                                 if (rmdir(dirp->d_name) == -1) {
 509                                         printf(" (REMOVAL FAILED: %s)\n",
 510                                             strerror(errno));
 511                                         n = 1;
 512                                         break;
 513                                 }
 514                                 /* ".." reference to parent is removed */
 515                                 inoinfo(idesc->id_number)->ino_linkcnt--;
 516                                 printf(" (REMOVED)\n");
 517                                 break;
 518                         }
 519                         fileerror(idesc->id_number, dirp->d_ino, errmsg);
 520                         if ((n = reply("REMOVE")) == 1)
 521                                 break;
 522                         ginode(dirp->d_ino, &ip);
 523                         dp = ip.i_dp;
 524                         inoinfo(dirp->d_ino)->ino_state =
 525                            (DIP(dp, di_mode) & IFMT) == IFDIR ? DSTATE : FSTATE;
 526                         inoinfo(dirp->d_ino)->ino_linkcnt = DIP(dp, di_nlink);
 527                         irelse(&ip);
 528                         goto again;
 529
 530                 case DSTATE:
 531                 case DZLINK:
 532                         if (inoinfo(idesc->id_number)->ino_state == DFOUND)
 533                                 inoinfo(dirp->d_ino)->ino_state = DFOUND;
 534                         /* FALLTHROUGH */
 535
 536                 case DFOUND:
 537                         inp = getinoinfo(dirp->d_ino);
 538                         if (idesc->id_entryno > 2) {
 539                                 if (inp->i_parent == 0)
 540                                         inp->i_parent = idesc->id_number;
 541                                 else if ((n = fix_extraneous(inp, idesc)) == 1)
 542                                         break;
 543                         }
 544                         /* FALLTHROUGH */
 545
 546                 case FSTATE:
 547                 case FZLINK:
 548                         if (dirp->d_type != inoinfo(dirp->d_ino)->ino_type) {
 549                                 fileerror(idesc->id_number, dirp->d_ino,
 550                                     "BAD TYPE VALUE");
 551                                 dirp->d_type = inoinfo(dirp->d_ino)->ino_type;
 552                                 if (reply("FIX") == 1)
 553                                         ret |= ALTERED;
 554                         }
 555                         inoinfo(dirp->d_ino)->ino_linkcnt--;
 556                         break;
 557
 558                 default:
 559                         errx(EEXIT, "BAD STATE %d FOR INODE I=%ju",
 560                             inoinfo(dirp->d_ino)->ino_state,
 561                             (uintmax_t)dirp->d_ino);
 562                 }
 563         }
 564         if (n == 0)
 565                 return (ret|KEEPON);
 566         dirp->d_ino = 0;
 567         return (ret|KEEPON|ALTERED);
 568 }
 569
 570 static int
 571 fix_extraneous(struct inoinfo *inp, struct inodesc *idesc)
 572 {
 573         char *cp;
 574         struct inode ip;
 575         struct inodesc dotdesc;
 576         char oldname[MAXPATHLEN + 1];
 577         char newname[MAXPATHLEN + 1];
 578
 579         /*
 580          * If we have not yet found "..", look it up now so we know
 581          * which inode the directory itself believes is its parent.
 582          */
 583         if (inp->i_dotdot == 0) {
 584                 memset(&dotdesc, 0, sizeof(struct inodesc));
 585                 dotdesc.id_type = DATA;
 586                 dotdesc.id_number = idesc->id_dirp->d_ino;
 587                 dotdesc.id_func = findino;
 588                 dotdesc.id_name = strdup("..");
 589                 ginode(dotdesc.id_number, &ip);
 590                 if ((ckinode(ip.i_dp, &dotdesc) & FOUND))
 591                         inp->i_dotdot = dotdesc.id_parent;
 592                 irelse(&ip);
 593         }
 594         /*
 595          * We have the previously found old name (inp->i_parent) and the
 596          * just found new name (idesc->id_number). We have five cases:
 597          * 1)  ".." is missing - can remove either name, choose to delete
 598          *     new one and let fsck create ".." pointing to old name.
 599          * 2) Both new and old are in same directory, choose to delete
 600          *    the new name and let fsck fix ".." if it is wrong.
 601          * 3) ".." does not point to the new name, so delete it and let
 602          *    fsck fix ".." to point to the old one if it is wrong.
 603          * 4) ".." points to the old name only, so delete the new one.
 604          * 5) ".." points to the new name only, so delete the old one.
 605          *
 606          * For cases 1-4 we eliminate the new name;
 607          * for case 5 we eliminate the old name.
 608          */
 609         if (inp->i_dotdot == 0 ||                   /* Case 1 */
 610             idesc->id_number == inp->i_parent ||    /* Case 2 */
 611             inp->i_dotdot != idesc->id_number ||    /* Case 3 */
 612             inp->i_dotdot == inp->i_parent) {       /* Case 4 */
 613                 getpathname(newname, idesc->id_number, idesc->id_number);
 614                 if (strcmp(newname, "/") != 0)
 615                         strcat (newname, "/");
 616                 strcat(newname, idesc->id_dirp->d_name);
 617                 getpathname(oldname, inp->i_number, inp->i_number);
 618                 pwarn("%s IS AN EXTRANEOUS HARD LINK TO DIRECTORY %s",
 619                     newname, oldname);
 620                 if (cursnapshot != 0) {
 621                         /*
 622                          * We need to
 623                          *    setcwd(idesc->id_number);
 624                          *    unlink(idesc->id_dirp->d_name);
 625                          */
 626                         cmd.value = idesc->id_number;
 627                         if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 628                             &cmd, sizeof cmd) == -1) {
 629                                 printf(" (IGNORED)\n");
 630                                 return (0);
 631                         }
 632                         cmd.value = (intptr_t)idesc->id_dirp->d_name;
 633                         cmd.size = inp->i_number; /* verify same name */
 634                         if (sysctlbyname("vfs.ffs.unlink", 0, 0,
 635                             &cmd, sizeof cmd) == -1) {
 636                                 printf(" (UNLINK FAILED: %s)\n",
 637                                     strerror(errno));
 638                                 return (0);
 639                         }
 640                         printf(" (REMOVED)\n");
 641                         return (0);
 642                 }
 643                 if (preen) {
 644                         printf(" (REMOVED)\n");
 645                         return (1);
 646                 }
 647                 return (reply("REMOVE"));
 648         }
 649         /*
 650          * None of the first four cases above, so must be case (5).
 651          * Eliminate the old name and make the new the name the parent.
 652          */
 653         getpathname(oldname, inp->i_parent, inp->i_number);
 654         getpathname(newname, inp->i_number, inp->i_number);
 655         pwarn("%s IS AN EXTRANEOUS HARD LINK TO DIRECTORY %s", oldname,
 656             newname);
 657         if (cursnapshot != 0) {
 658                 /*
 659                  * We need to
 660                  *    setcwd(inp->i_parent);
 661                  *    unlink(last component of oldname pathname);
 662                  */
 663                 cmd.value = inp->i_parent;
 664                 if (sysctlbyname("vfs.ffs.setcwd", 0, 0,
 665                     &cmd, sizeof cmd) == -1) {
 666                         printf(" (IGNORED)\n");
 667                         return (0);
 668                 }
 669                 if ((cp = strchr(oldname, '/')) == NULL) {
 670                         printf(" (IGNORED)\n");
 671                         return (0);
 672                 }
 673                 cmd.value = (intptr_t)(cp + 1);
 674                 cmd.size = inp->i_number; /* verify same name */
 675                 if (sysctlbyname("vfs.ffs.unlink", 0, 0,
 676                     &cmd, sizeof cmd) == -1) {
 677                         printf(" (UNLINK FAILED: %s)\n",
 678                             strerror(errno));
 679                         return (0);
 680                 }
 681                 printf(" (REMOVED)\n");
 682                 inp->i_parent = idesc->id_number;  /* reparent to correct dir */
 683                 return (0);
 684         }
 685         if (!preen && !reply("REMOVE"))
 686                 return (0);
 687         memset(&dotdesc, 0, sizeof(struct inodesc));
 688         dotdesc.id_type = DATA;
 689         dotdesc.id_number = inp->i_parent; /* directory in which name appears */
 690         dotdesc.id_parent = inp->i_number; /* inode number in entry to delete */
 691         dotdesc.id_func = deleteentry;
 692         ginode(dotdesc.id_number, &ip);
 693         if ((ckinode(ip.i_dp, &dotdesc) & FOUND) && preen)
 694                 printf(" (REMOVED)\n");
 695         irelse(&ip);
 696         inp->i_parent = idesc->id_number;  /* reparent to correct directory */
 697         inoinfo(inp->i_number)->ino_linkcnt++; /* name gone, return reference */
 698         return (0);
 699 }
 700
 701 static int
 702 deleteentry(struct inodesc *idesc)
 703 {
 704         struct direct *dirp = idesc->id_dirp;
 705
 706         if (idesc->id_entryno++ < 2 || dirp->d_ino != idesc->id_parent)
 707                 return (KEEPON);
 708         dirp->d_ino = 0;
 709         return (ALTERED|STOP|FOUND);
 710 }
 711
 712 /*
 713  * Routine to sort disk blocks.
 714  */
 715 static int
 716 blksort(const void *arg1, const void *arg2)
 717 {
 718
 719         return ((*(struct inoinfo * const *)arg1)->i_blks[0] -
 720                 (*(struct inoinfo * const *)arg2)->i_blks[0]);
 721 }