sbin/fsck_ext2fs/dir.c

   1 /*      $NetBSD: dir.c,v 1.23 2009/10/19 18:41:07 bouyer Exp $  */
   2
   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 /*
  33  * Copyright (c) 1997 Manuel Bouyer.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  45  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  47  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  48  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  49  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  53  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 #include <sys/cdefs.h>
  57 #ifndef lint
  58 #if 0
  59 static char sccsid[] = "@(#)dir.c       8.5 (Berkeley) 12/8/94";
  60 #else
  61 __RCSID("$NetBSD: dir.c,v 1.23 2009/10/19 18:41:07 bouyer Exp $");
  62 #endif
  63 #endif /* not lint */
  64
  65 #include <sys/param.h>
  66 #include <sys/time.h>
  67 #include <ufs/ufs/dir.h>
  68 #include <ufs/ext2fs/ext2fs_dinode.h>
  69 #include <ufs/ext2fs/ext2fs_dir.h>
  70 #include <ufs/ext2fs/ext2fs.h>
  71
  72 #include <ufs/ufs/dinode.h> /* for IFMT & friends */
  73
  74 #include <stdio.h>
  75 #include <stdlib.h>
  76 #include <string.h>
  77 #include <err.h>
  78
  79 #include "fsck.h"
  80 #include "fsutil.h"
  81 #include "extern.h"
  82
  83 const char      *lfname = "lost+found";
  84 int     lfmode = 01700;
  85 struct  ext2fs_dirtemplate emptydir = {
  86         .dot_ino = 0,
  87         .dot_reclen = DIRBLKSIZ,
  88 };
  89 struct  ext2fs_dirtemplate dirhead = {
  90         .dot_ino = 0,
  91         .dot_reclen = 12,
  92         .dot_namlen = 1,
  93         .dot_type = EXT2_FT_DIR,
  94         .dot_name = ".",
  95         .dotdot_ino = 0,
  96         .dotdot_reclen = DIRBLKSIZ - 12,
  97         .dotdot_namlen = 2,
  98         .dotdot_type = EXT2_FT_DIR,
  99         .dotdot_name = "..",
 100 };
 101 #undef DIRBLKSIZ
 102
 103 static int expanddir(struct ext2fs_dinode *, char *);
 104 static void freedir(ino_t, ino_t);
 105 static struct ext2fs_direct *fsck_readdir(struct inodesc *);
 106 static struct bufarea *getdirblk(daddr_t, long);
 107 static int lftempname(char *, ino_t);
 108 static int mkentry(struct inodesc *);
 109 static int chgino(struct  inodesc *);
 110
 111 /*
 112  * Propagate connected state through the tree.
 113  */
 114 void
 115 propagate(void)
 116 {
 117         struct inoinfo **inpp, *inp, *pinp;
 118         struct inoinfo **inpend;
 119
 120         /*
 121          * Create a list of children for each directory.
 122          */
 123         inpend = &inpsort[inplast];
 124         for (inpp = inpsort; inpp < inpend; inpp++) {
 125                 inp = *inpp;
 126                 if (inp->i_parent == 0 ||
 127                     inp->i_number == EXT2_ROOTINO)
 128                         continue;
 129                 pinp = getinoinfo(inp->i_parent);
 130                 inp->i_parentp = pinp;
 131                 inp->i_sibling = pinp->i_child;
 132                 pinp->i_child = inp;
 133         }
 134         inp = getinoinfo(EXT2_ROOTINO);
 135         while (inp) {
 136                 statemap[inp->i_number] = DFOUND;
 137                 if (inp->i_child &&
 138                     statemap[inp->i_child->i_number] == DSTATE)
 139                         inp = inp->i_child;
 140                 else if (inp->i_sibling)
 141                         inp = inp->i_sibling;
 142                 else
 143                         inp = inp->i_parentp;
 144         }
 145 }
 146
 147 /*
 148  * Scan each entry in a directory block.
 149  */
 150 int
 151 dirscan(struct inodesc *idesc)
 152 {
 153         struct ext2fs_direct *dp;
 154         struct bufarea *bp;
 155         int dsize, n;
 156         long blksiz;
 157         char *dbuf = NULL;
 158
 159         if ((dbuf = malloc(sblock.e2fs_bsize)) == NULL)
 160                 err(8, "Can't allocate directory block");
 161
 162         if (idesc->id_type != DATA)
 163                 errexit("wrong type to dirscan %d", idesc->id_type);
 164         if (idesc->id_entryno == 0 &&
 165             (idesc->id_filesize & (sblock.e2fs_bsize - 1)) != 0)
 166                 idesc->id_filesize = roundup(idesc->id_filesize, sblock.e2fs_bsize);
 167         blksiz = idesc->id_numfrags * sblock.e2fs_bsize;
 168         if (chkrange(idesc->id_blkno, idesc->id_numfrags)) {
 169                 idesc->id_filesize -= blksiz;
 170                 free(dbuf);
 171                 return (SKIP);
 172         }
 173         idesc->id_loc = 0;
 174         for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
 175                 dsize = fs2h16(dp->e2d_reclen);
 176                 memcpy(dbuf, dp, (size_t)dsize);
 177                 idesc->id_dirp = (struct ext2fs_direct *)dbuf;
 178                 if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
 179                         bp = getdirblk(idesc->id_blkno, blksiz);
 180                         memcpy(bp->b_un.b_buf + idesc->id_loc - dsize, dbuf,
 181                             (size_t)dsize);
 182                         dirty(bp);
 183                         sbdirty();
 184                 }
 185                 if (n & STOP) {
 186                         free(dbuf);
 187                         return (n);
 188                 }
 189         }
 190         free(dbuf);
 191         return (idesc->id_filesize > 0 ? KEEPON : STOP);
 192 }
 193
 194 /*
 195  * get next entry in a directory.
 196  */
 197 static struct ext2fs_direct *
 198 fsck_readdir(struct inodesc *idesc)
 199 {
 200         struct ext2fs_direct *dp, *ndp;
 201         struct bufarea *bp;
 202         long size, blksiz, fix, dploc;
 203
 204         blksiz = idesc->id_numfrags * sblock.e2fs_bsize;
 205         bp = getdirblk(idesc->id_blkno, blksiz);
 206         if (idesc->id_loc % sblock.e2fs_bsize == 0 && idesc->id_filesize > 0 &&
 207             idesc->id_loc < blksiz) {
 208                 dp = (struct ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
 209                 if (dircheck(idesc, dp))
 210                         goto dpok;
 211                 if (idesc->id_fix == IGNORE)
 212                         return (0);
 213                 fix = dofix(idesc, "DIRECTORY CORRUPTED");
 214                 bp = getdirblk(idesc->id_blkno, blksiz);
 215                 dp = (struct ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
 216                 dp->e2d_reclen = h2fs16(sblock.e2fs_bsize);
 217                 dp->e2d_ino = 0;
 218                 dp->e2d_namlen = 0;
 219                 dp->e2d_type = 0;
 220                 dp->e2d_name[0] = '\0';
 221                 if (fix)
 222                         dirty(bp);
 223                 idesc->id_loc += sblock.e2fs_bsize;
 224                 idesc->id_filesize -= sblock.e2fs_bsize;
 225                 return (dp);
 226         }
 227 dpok:
 228         if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
 229                 return NULL;
 230         dploc = idesc->id_loc;
 231         dp = (struct ext2fs_direct *)(bp->b_un.b_buf + dploc);
 232         idesc->id_loc += fs2h16(dp->e2d_reclen);
 233         idesc->id_filesize -= fs2h16(dp->e2d_reclen);
 234         if ((idesc->id_loc % sblock.e2fs_bsize) == 0)
 235                 return (dp);
 236         ndp = (struct ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
 237         if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
 238             dircheck(idesc, ndp) == 0) {
 239                 size = sblock.e2fs_bsize - (idesc->id_loc % sblock.e2fs_bsize);
 240                 idesc->id_loc += size;
 241                 idesc->id_filesize -= size;
 242                 if (idesc->id_fix == IGNORE)
 243                         return (0);
 244                 fix = dofix(idesc, "DIRECTORY CORRUPTED");
 245                 bp = getdirblk(idesc->id_blkno, blksiz);
 246                 dp = (struct ext2fs_direct *)(bp->b_un.b_buf + dploc);
 247                 dp->e2d_reclen = h2fs16(fs2h16(dp->e2d_reclen) + size);
 248                 if (fix)
 249                         dirty(bp);
 250         }
 251         return (dp);
 252 }
 253
 254 /*
 255  * Verify that a directory entry is valid.
 256  * This is a superset of the checks made in the kernel.
 257  */
 258 int
 259 dircheck(struct inodesc *idesc, struct ext2fs_direct *dp)
 260 {
 261         int size;
 262         char *cp;
 263         int spaceleft;
 264         u_int16_t reclen = fs2h16(dp->e2d_reclen);
 265
 266         spaceleft = sblock.e2fs_bsize - (idesc->id_loc % sblock.e2fs_bsize);
 267         if (fs2h32(dp->e2d_ino) > maxino ||
 268             reclen == 0 ||
 269             reclen > spaceleft ||
 270             (reclen & 0x3) != 0)
 271                 return (0);
 272         if (dp->e2d_ino == 0)
 273                 return (1);
 274         if (sblock.e2fs.e2fs_rev < E2FS_REV1 ||
 275             (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE) == 0)
 276                 if (dp->e2d_type != 0)
 277                         return (1);
 278         size = EXT2FS_DIRSIZ(dp->e2d_namlen);
 279         if (reclen < size ||
 280             idesc->id_filesize < size /* ||
 281             dp->e2d_namlen > EXT2FS_MAXNAMLEN */)
 282                 return (0);
 283         for (cp = dp->e2d_name, size = 0; size < dp->e2d_namlen; size++)
 284                 if (*cp == '\0' || (*cp++ == '/'))
 285                         return (0);
 286         return (1);
 287 }
 288
 289 void
 290 direrror(ino_t ino, const char *errmesg)
 291 {
 292
 293         fileerror(ino, ino, errmesg);
 294 }
 295
 296 void
 297 fileerror(ino_t cwd, ino_t ino, const char *errmesg)
 298 {
 299         struct ext2fs_dinode *dp;
 300         char pathbuf[MAXPATHLEN + 1];
 301
 302         pwarn("%s ", errmesg);
 303         pinode(ino);
 304         printf("\n");
 305         getpathname(pathbuf, sizeof(pathbuf), cwd, ino);
 306         if ((ino < EXT2_FIRSTINO && ino != EXT2_ROOTINO) || ino > maxino) {
 307                 pfatal("NAME=%s\n", pathbuf);
 308                 return;
 309         }
 310         dp = ginode(ino);
 311         if (ftypeok(dp))
 312                 pfatal("%s=%s\n",
 313                     (fs2h16(dp->e2di_mode) & IFMT) == IFDIR ? "DIR" : "FILE", pathbuf);
 314         else
 315                 pfatal("NAME=%s\n", pathbuf);
 316 }
 317
 318 void
 319 adjust(struct inodesc *idesc, short lcnt)
 320 {
 321         struct ext2fs_dinode *dp;
 322
 323         dp = ginode(idesc->id_number);
 324         if (fs2h16(dp->e2di_nlink) == lcnt) {
 325                 if (linkup(idesc->id_number, (ino_t)0) == 0)
 326                         clri(idesc, "UNREF", 0);
 327         } else {
 328                 pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
 329                         ((fs2h16(dp->e2di_mode) & IFMT) == IFDIR ? "DIR" : "FILE"));
 330                 pinode(idesc->id_number);
 331                 printf(" COUNT %d SHOULD BE %d",
 332                         fs2h16(dp->e2di_nlink), fs2h16(dp->e2di_nlink) - lcnt);
 333                 if (preen) {
 334                         if (lcnt < 0) {
 335                                 printf("\n");
 336                                 pfatal("LINK COUNT INCREASING");
 337                         }
 338                         printf(" (ADJUSTED)\n");
 339                 }
 340                 if (preen || reply("ADJUST") == 1) {
 341                         dp->e2di_nlink = h2fs16(fs2h16(dp->e2di_nlink) - lcnt);
 342                         inodirty();
 343                 }
 344         }
 345 }
 346
 347 static int
 348 mkentry(struct inodesc *idesc)
 349 {
 350         struct ext2fs_direct *dirp = idesc->id_dirp;
 351         struct ext2fs_direct newent;
 352         int newlen, oldlen;
 353
 354         newent.e2d_type = 0;    /* XXX gcc */
 355         newent.e2d_namlen = strlen(idesc->id_name);
 356         if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
 357             (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
 358                 newent.e2d_type = inot2ext2dt(typemap[idesc->id_parent]);
 359         newlen = EXT2FS_DIRSIZ(newent.e2d_namlen);
 360         if (dirp->e2d_ino != 0)
 361                 oldlen = EXT2FS_DIRSIZ(dirp->e2d_namlen);
 362         else
 363                 oldlen = 0;
 364         if (fs2h16(dirp->e2d_reclen) - oldlen < newlen)
 365                 return (KEEPON);
 366         newent.e2d_reclen = h2fs16(fs2h16(dirp->e2d_reclen) - oldlen);
 367         dirp->e2d_reclen = h2fs16(oldlen);
 368         dirp = (struct ext2fs_direct *)(((char *)dirp) + oldlen);
 369         dirp->e2d_ino = h2fs32(idesc->id_parent); /* ino to be entered is in id_parent */
 370         dirp->e2d_reclen = newent.e2d_reclen;
 371         dirp->e2d_namlen = newent.e2d_namlen;
 372         dirp->e2d_type = newent.e2d_type;
 373         memcpy(dirp->e2d_name, idesc->id_name, (size_t)(dirp->e2d_namlen));
 374         return (ALTERED|STOP);
 375 }
 376
 377 static int
 378 chgino(struct inodesc *idesc)
 379 {
 380         struct ext2fs_direct *dirp = idesc->id_dirp;
 381         u_int16_t namlen = dirp->e2d_namlen;
 382
 383         if (strlen(idesc->id_name) != namlen ||
 384                 strncmp(dirp->e2d_name, idesc->id_name, (int)namlen))
 385                 return (KEEPON);
 386         dirp->e2d_ino = h2fs32(idesc->id_parent);
 387         if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
 388             (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
 389                 dirp->e2d_type = inot2ext2dt(typemap[idesc->id_parent]);
 390         else
 391                 dirp->e2d_type = 0;
 392         return (ALTERED|STOP);
 393 }
 394
 395 int
 396 linkup(ino_t orphan, ino_t parentdir)
 397 {
 398         struct ext2fs_dinode *dp;
 399         int lostdir;
 400         ino_t oldlfdir;
 401         struct inodesc idesc;
 402         char tempname[BUFSIZ];
 403
 404         memset(&idesc, 0, sizeof(struct inodesc));
 405         dp = ginode(orphan);
 406         lostdir = (fs2h16(dp->e2di_mode) & IFMT) == IFDIR;
 407         pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
 408         pinode(orphan);
 409         if (preen && inosize(dp) == 0)
 410                 return (0);
 411         if (preen)
 412                 printf(" (RECONNECTED)\n");
 413         else
 414                 if (reply("RECONNECT") == 0)
 415                         return (0);
 416         if (lfdir == 0) {
 417                 dp = ginode(EXT2_ROOTINO);
 418                 idesc.id_name = lfname;
 419                 idesc.id_type = DATA;
 420                 idesc.id_func = findino;
 421                 idesc.id_number = EXT2_ROOTINO;
 422                 if ((ckinode(dp, &idesc) & FOUND) != 0) {
 423                         lfdir = idesc.id_parent;
 424                 } else {
 425                         pwarn("NO lost+found DIRECTORY");
 426                         if (preen || reply("CREATE")) {
 427                                 lfdir = allocdir(EXT2_ROOTINO, (ino_t)0, lfmode);
 428                                 if (lfdir != 0) {
 429                                         if (makeentry(EXT2_ROOTINO, lfdir, lfname) != 0) {
 430                                                 if (preen)
 431                                                         printf(" (CREATED)\n");
 432                                         } else {
 433                                                 freedir(lfdir, EXT2_ROOTINO);
 434                                                 lfdir = 0;
 435                                                 if (preen)
 436                                                         printf("\n");
 437                                         }
 438                                 }
 439                         }
 440                 }
 441                 if (lfdir == 0) {
 442                         pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY");
 443                         printf("\n\n");
 444                         return (0);
 445                 }
 446         }
 447         dp = ginode(lfdir);
 448         if ((fs2h16(dp->e2di_mode) & IFMT) != IFDIR) {
 449                 pfatal("lost+found IS NOT A DIRECTORY");
 450                 if (reply("REALLOCATE") == 0)
 451                         return (0);
 452                 oldlfdir = lfdir;
 453                 if ((lfdir = allocdir(EXT2_ROOTINO, (ino_t)0, lfmode)) == 0) {
 454                         pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
 455                         return (0);
 456                 }
 457                 if ((changeino(EXT2_ROOTINO, lfname, lfdir) & ALTERED) == 0) {
 458                         pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
 459                         return (0);
 460                 }
 461                 inodirty();
 462                 idesc.id_type = ADDR;
 463                 idesc.id_func = pass4check;
 464                 idesc.id_number = oldlfdir;
 465                 adjust(&idesc, lncntp[oldlfdir] + 1);
 466                 lncntp[oldlfdir] = 0;
 467                 dp = ginode(lfdir);
 468         }
 469         if (statemap[lfdir] != DFOUND) {
 470                 pfatal("SORRY. NO lost+found DIRECTORY\n\n");
 471                 return (0);
 472         }
 473         (void)lftempname(tempname, orphan);
 474         if (makeentry(lfdir, orphan, tempname) == 0) {
 475                 pfatal("SORRY. NO SPACE IN lost+found DIRECTORY");
 476                 printf("\n\n");
 477                 return (0);
 478         }
 479         lncntp[orphan]--;
 480         if (lostdir) {
 481                 if ((changeino(orphan, "..", lfdir) & ALTERED) == 0 &&
 482                     parentdir != (ino_t)-1)
 483                         (void)makeentry(orphan, lfdir, "..");
 484                 dp = ginode(lfdir);
 485                 dp->e2di_nlink = h2fs16(fs2h16(dp->e2di_nlink) +1);
 486                 inodirty();
 487                 lncntp[lfdir]++;
 488                 pwarn("DIR I=%llu CONNECTED. ", (unsigned long long)orphan);
 489                 if (parentdir != (ino_t)-1)
 490                         printf("PARENT WAS I=%llu\n",
 491                             (unsigned long long)parentdir);
 492                 if (preen == 0)
 493                         printf("\n");
 494         }
 495         return (1);
 496 }
 497
 498 /*
 499  * fix an entry in a directory.
 500  */
 501 int
 502 changeino(ino_t dir, const char *name, ino_t newnum)
 503 {
 504         struct inodesc idesc;
 505
 506         memset(&idesc, 0, sizeof(struct inodesc));
 507         idesc.id_type = DATA;
 508         idesc.id_func = chgino;
 509         idesc.id_number = dir;
 510         idesc.id_fix = DONTKNOW;
 511         idesc.id_name = name;
 512         idesc.id_parent = newnum;       /* new value for name */
 513         return (ckinode(ginode(dir), &idesc));
 514 }
 515
 516 /*
 517  * make an entry in a directory
 518  */
 519 int
 520 makeentry(ino_t parent, ino_t ino, const char *name)
 521 {
 522         struct ext2fs_dinode *dp;
 523         struct inodesc idesc;
 524         char pathbuf[MAXPATHLEN + 1];
 525
 526         if ((parent < EXT2_FIRSTINO && parent != EXT2_ROOTINO)
 527                 || parent >= maxino ||
 528             (ino < EXT2_FIRSTINO && ino < EXT2_ROOTINO) || ino >= maxino)
 529                 return (0);
 530         memset(&idesc, 0, sizeof(struct inodesc));
 531         idesc.id_type = DATA;
 532         idesc.id_func = mkentry;
 533         idesc.id_number = parent;
 534         idesc.id_parent = ino;  /* this is the inode to enter */
 535         idesc.id_fix = DONTKNOW;
 536         idesc.id_name = name;
 537         dp = ginode(parent);
 538         if (inosize(dp) % sblock.e2fs_bsize) {
 539                 inossize(dp, roundup(inosize(dp), sblock.e2fs_bsize));
 540                 inodirty();
 541         }
 542         if ((ckinode(dp, &idesc) & ALTERED) != 0)
 543                 return (1);
 544         getpathname(pathbuf, sizeof(pathbuf), parent, parent);
 545         dp = ginode(parent);
 546         if (expanddir(dp, pathbuf) == 0)
 547                 return (0);
 548         return (ckinode(dp, &idesc) & ALTERED);
 549 }
 550
 551 /*
 552  * Attempt to expand the size of a directory
 553  */
 554 static int
 555 expanddir(struct ext2fs_dinode *dp, char *name)
 556 {
 557         daddr_t lastbn, newblk;
 558         struct bufarea *bp;
 559         char *firstblk;
 560
 561         lastbn = lblkno(&sblock, inosize(dp));
 562         if (lastbn >= NDADDR - 1 || fs2h32(dp->e2di_blocks[lastbn]) == 0 ||
 563                 inosize(dp) == 0) {
 564                 return (0);
 565         }
 566         if ((newblk = allocblk()) == 0) {
 567                 return (0);
 568         }
 569         dp->e2di_blocks[lastbn + 1] = dp->e2di_blocks[lastbn];
 570         dp->e2di_blocks[lastbn] = h2fs32(newblk);
 571         inossize(dp, inosize(dp) + sblock.e2fs_bsize);
 572         dp->e2di_nblock = h2fs32(fs2h32(dp->e2di_nblock) + 1);
 573         bp = getdirblk(fs2h32(dp->e2di_blocks[lastbn + 1]),
 574                 sblock.e2fs_bsize);
 575         if (bp->b_errs)
 576                 goto bad;
 577         if ((firstblk = malloc(sblock.e2fs_bsize)) == NULL)
 578                 err(8, "cannot allocate first block");
 579         memcpy(firstblk, bp->b_un.b_buf, sblock.e2fs_bsize);
 580         bp = getdirblk(newblk, sblock.e2fs_bsize);
 581         if (bp->b_errs) {
 582                 free(firstblk);
 583                 goto bad;
 584         }
 585         memcpy(bp->b_un.b_buf, firstblk, sblock.e2fs_bsize);
 586         free(firstblk);
 587         dirty(bp);
 588         bp = getdirblk(fs2h32(dp->e2di_blocks[lastbn + 1]),
 589                 sblock.e2fs_bsize);
 590         if (bp->b_errs)
 591                 goto bad;
 592         emptydir.dot_reclen = h2fs16(sblock.e2fs_bsize);
 593         memcpy(bp->b_un.b_buf, &emptydir, sizeof emptydir);
 594         pwarn("NO SPACE LEFT IN %s", name);
 595         if (preen)
 596                 printf(" (EXPANDED)\n");
 597         else if (reply("EXPAND") == 0)
 598                 goto bad;
 599         dirty(bp);
 600         inodirty();
 601         return (1);
 602 bad:
 603         dp->e2di_blocks[lastbn] = dp->e2di_blocks[lastbn + 1];
 604         dp->e2di_blocks[lastbn + 1] = 0;
 605         inossize(dp, inosize(dp) - sblock.e2fs_bsize);
 606         dp->e2di_nblock = h2fs32(fs2h32(dp->e2di_nblock) - 1);
 607         freeblk(newblk);
 608         return (0);
 609 }
 610
 611 /*
 612  * allocate a new directory
 613  */
 614 int
 615 allocdir(ino_t parent, ino_t request, int mode)
 616 {
 617         ino_t ino;
 618         struct ext2fs_dinode *dp;
 619         struct bufarea *bp;
 620         struct ext2fs_dirtemplate *dirp;
 621
 622         ino = allocino(request, IFDIR|mode);
 623         dirhead.dot_reclen = h2fs16(12); /* XXX */
 624         dirhead.dotdot_reclen = h2fs16(sblock.e2fs_bsize - 12); /* XXX */
 625         dirhead.dot_namlen = 1;
 626         if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
 627             (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
 628                 dirhead.dot_type = EXT2_FT_DIR;
 629         else
 630                 dirhead.dot_type = 0;
 631         dirhead.dotdot_namlen = 2;
 632         if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
 633             (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
 634                 dirhead.dotdot_type = EXT2_FT_DIR;
 635         else
 636                 dirhead.dotdot_type = 0;
 637         dirp = &dirhead;
 638         dirp->dot_ino = h2fs32(ino);
 639         dirp->dotdot_ino = h2fs32(parent);
 640         dp = ginode(ino);
 641         bp = getdirblk(fs2h32(dp->e2di_blocks[0]), sblock.e2fs_bsize);
 642         if (bp->b_errs) {
 643                 freeino(ino);
 644                 return (0);
 645         }
 646         memcpy(bp->b_un.b_buf, dirp, sizeof(struct ext2fs_dirtemplate));
 647         dirty(bp);
 648         dp->e2di_nlink = h2fs16(2);
 649         inodirty();
 650         if (ino == EXT2_ROOTINO) {
 651                 lncntp[ino] = fs2h16(dp->e2di_nlink);
 652                 cacheino(dp, ino);
 653                 return(ino);
 654         }
 655         if (statemap[parent] != DSTATE && statemap[parent] != DFOUND) {
 656                 freeino(ino);
 657                 return (0);
 658         }
 659         cacheino(dp, ino);
 660         statemap[ino] = statemap[parent];
 661         if (statemap[ino] == DSTATE) {
 662                 lncntp[ino] = fs2h16(dp->e2di_nlink);
 663                 lncntp[parent]++;
 664         }
 665         dp = ginode(parent);
 666         dp->e2di_nlink = h2fs16(fs2h16(dp->e2di_nlink) + 1);
 667         inodirty();
 668         return (ino);
 669 }
 670
 671 /*
 672  * free a directory inode
 673  */
 674 static void
 675 freedir(ino_t ino, ino_t parent)
 676 {
 677         struct ext2fs_dinode *dp;
 678
 679         if (ino != parent) {
 680                 dp = ginode(parent);
 681                 dp->e2di_nlink = h2fs16(fs2h16(dp->e2di_nlink) - 1);
 682                 inodirty();
 683         }
 684         freeino(ino);
 685 }
 686
 687 /*
 688  * generate a temporary name for the lost+found directory.
 689  */
 690 static int
 691 lftempname(char *bufp, ino_t ino)
 692 {
 693         ino_t in;
 694         char *cp;
 695         int namlen;
 696
 697         cp = bufp + 2;
 698         for (in = maxino; in > 0; in /= 10)
 699                 cp++;
 700         *--cp = 0;
 701         namlen = cp - bufp;
 702         in = ino;
 703         while (cp > bufp) {
 704                 *--cp = (in % 10) + '0';
 705                 in /= 10;
 706         }
 707         *cp = '#';
 708         return (namlen);
 709 }
 710
 711 /*
 712  * Get a directory block.
 713  * Insure that it is held until another is requested.
 714  */
 715 static struct bufarea *
 716 getdirblk(daddr_t blkno, long size)
 717 {
 718
 719         if (pdirbp != 0)
 720                 pdirbp->b_flags &= ~B_INUSE;
 721         pdirbp = getdatablk(blkno, size);
 722         return (pdirbp);
 723 }