e2fsck/pass3.c

   1 /*
   2  * pass3.c -- pass #3 of e2fsck: Check for directory connectivity
   3  *
   4  * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Public
   8  * License.
   9  * %End-Header%
  10  *
  11  * Pass #3 assures that all directories are connected to the
  12  * filesystem tree, using the following algorithm:
  13  *
  14  * First, the root directory is checked to make sure it exists; if
  15  * not, e2fsck will offer to create a new one.  It is then marked as
  16  * "done".
  17  *
  18  * Then, pass3 interates over all directory inodes; for each directory
  19  * it attempts to trace up the filesystem tree, using dirinfo.parent
  20  * until it reaches a directory which has been marked "done".  If it
  21  * can not do so, then the directory must be disconnected, and e2fsck
  22  * will offer to reconnect it to /lost+found.  While it is chasing
  23  * parent pointers up the filesystem tree, if pass3 sees a directory
  24  * twice, then it has detected a filesystem loop, and it will again
  25  * offer to reconnect the directory to /lost+found in to break the
  26  * filesystem loop.
  27  *
  28  * Pass 3 also contains the subroutine, e2fsck_reconnect_file() to
  29  * reconnect inodes to /lost+found; this subroutine is also used by
  30  * pass 4.  e2fsck_reconnect_file() calls get_lost_and_found(), which
  31  * is responsible for creating /lost+found if it does not exist.
  32  *
  33  * Pass 3 frees the following data structures:
  34  *      - The dirinfo directory information cache.
  35  */
  36
  37 #include "config.h"
  38 #ifdef HAVE_ERRNO_H
  39 #include <errno.h>
  40 #endif
  41
  42 #include "e2fsck.h"
  43 #include "problem.h"
  44
  45 static void check_root(e2fsck_t ctx);
  46 static int check_directory(e2fsck_t ctx, ext2_ino_t ino,
  47                            struct problem_context *pctx);
  48 static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent);
  49
  50 static ext2fs_inode_bitmap inode_loop_detect = 0;
  51 static ext2fs_inode_bitmap inode_done_map = 0;
  52
  53 void e2fsck_pass3(e2fsck_t ctx)
  54 {
  55         ext2_filsys fs = ctx->fs;
  56         struct dir_info_iter *iter = NULL;
  57 #ifdef RESOURCE_TRACK
  58         struct resource_track   rtrack;
  59 #endif
  60         struct problem_context  pctx;
  61         struct dir_info *dir;
  62         unsigned long maxdirs, count;
  63
  64         init_resource_track(&rtrack, ctx->fs->io);
  65         clear_problem_context(&pctx);
  66
  67 #ifdef MTRACE
  68         mtrace_print("Pass 3");
  69 #endif
  70
  71         if (!(ctx->options & E2F_OPT_PREEN))
  72                 fix_problem(ctx, PR_3_PASS_HEADER, &pctx);
  73
  74         /*
  75          * Allocate some bitmaps to do loop detection.
  76          */
  77         pctx.errcode = e2fsck_allocate_inode_bitmap(fs, _("inode done bitmap"),
  78                                         EXT2FS_BMAP64_AUTODIR,
  79                                         "inode_done_map", &inode_done_map);
  80         if (pctx.errcode) {
  81                 pctx.num = 2;
  82                 fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx);
  83                 ctx->flags |= E2F_FLAG_ABORT;
  84                 goto abort_exit;
  85         }
  86         print_resource_track(ctx, _("Peak memory"), &ctx->global_rtrack, NULL);
  87
  88         check_root(ctx);
  89         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
  90                 goto abort_exit;
  91
  92         ext2fs_mark_inode_bitmap2(inode_done_map, EXT2_ROOT_INO);
  93
  94         maxdirs = e2fsck_get_num_dirinfo(ctx);
  95         count = 1;
  96
  97         if (ctx->progress)
  98                 if ((ctx->progress)(ctx, 3, 0, maxdirs))
  99                         goto abort_exit;
 100
 101         iter = e2fsck_dir_info_iter_begin(ctx);
 102         while ((dir = e2fsck_dir_info_iter(ctx, iter)) != 0) {
 103                 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 104                         goto abort_exit;
 105                 if (ctx->progress && (ctx->progress)(ctx, 3, count++, maxdirs))
 106                         goto abort_exit;
 107                 if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dir->ino))
 108                         if (check_directory(ctx, dir->ino, &pctx))
 109                                 goto abort_exit;
 110         }
 111
 112         /*
 113          * Force the creation of /lost+found if not present
 114          */
 115         if ((ctx->flags & E2F_OPT_READONLY) == 0)
 116                 e2fsck_get_lost_and_found(ctx, 1);
 117
 118         /*
 119          * If there are any directories that need to be indexed or
 120          * optimized, do it here.
 121          */
 122         e2fsck_rehash_directories(ctx);
 123
 124 abort_exit:
 125         if (iter)
 126                 e2fsck_dir_info_iter_end(ctx, iter);
 127         e2fsck_free_dir_info(ctx);
 128         if (inode_loop_detect) {
 129                 ext2fs_free_inode_bitmap(inode_loop_detect);
 130                 inode_loop_detect = 0;
 131         }
 132         if (inode_done_map) {
 133                 ext2fs_free_inode_bitmap(inode_done_map);
 134                 inode_done_map = 0;
 135         }
 136
 137         print_resource_track(ctx, _("Pass 3"), &rtrack, ctx->fs->io);
 138 }
 139
 140 /*
 141  * This makes sure the root inode is present; if not, we ask if the
 142  * user wants us to create it.  Not creating it is a fatal error.
 143  */
 144 static void check_root(e2fsck_t ctx)
 145 {
 146         ext2_filsys fs = ctx->fs;
 147         blk64_t                 blk;
 148         struct ext2_inode       inode;
 149         char *                  block;
 150         struct problem_context  pctx;
 151
 152         clear_problem_context(&pctx);
 153
 154         if (ext2fs_test_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO)) {
 155                 /*
 156                  * If the root inode is not a directory, die here.  The
 157                  * user must have answered 'no' in pass1 when we
 158                  * offered to clear it.
 159                  */
 160                 if (!(ext2fs_test_inode_bitmap2(ctx->inode_dir_map,
 161                                                EXT2_ROOT_INO))) {
 162                         fix_problem(ctx, PR_3_ROOT_NOT_DIR_ABORT, &pctx);
 163                         ctx->flags |= E2F_FLAG_ABORT;
 164                 }
 165                 return;
 166         }
 167
 168         if (!fix_problem(ctx, PR_3_NO_ROOT_INODE, &pctx)) {
 169                 fix_problem(ctx, PR_3_NO_ROOT_INODE_ABORT, &pctx);
 170                 ctx->flags |= E2F_FLAG_ABORT;
 171                 return;
 172         }
 173
 174         e2fsck_read_bitmaps(ctx);
 175
 176         /*
 177          * First, find a free block
 178          */
 179         pctx.errcode = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk);
 180         if (pctx.errcode) {
 181                 pctx.str = "ext2fs_new_block";
 182                 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
 183                 ctx->flags |= E2F_FLAG_ABORT;
 184                 return;
 185         }
 186         ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
 187         ext2fs_mark_block_bitmap2(fs->block_map, blk);
 188         ext2fs_mark_bb_dirty(fs);
 189
 190         /*
 191          * Now let's create the actual data block for the inode
 192          */
 193         pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO,
 194                                             &block);
 195         if (pctx.errcode) {
 196                 pctx.str = "ext2fs_new_dir_block";
 197                 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
 198                 ctx->flags |= E2F_FLAG_ABORT;
 199                 return;
 200         }
 201
 202         pctx.errcode = ext2fs_write_dir_block3(fs, blk, block, 0);
 203         if (pctx.errcode) {
 204                 pctx.str = "ext2fs_write_dir_block3";
 205                 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
 206                 ctx->flags |= E2F_FLAG_ABORT;
 207                 return;
 208         }
 209         ext2fs_free_mem(&block);
 210
 211         /*
 212          * Set up the inode structure
 213          */
 214         memset(&inode, 0, sizeof(inode));
 215         inode.i_mode = 040755;
 216         inode.i_size = fs->blocksize;
 217         inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now;
 218         inode.i_links_count = 2;
 219         ext2fs_iblk_set(fs, &inode, 1);
 220         inode.i_block[0] = blk;
 221
 222         /*
 223          * Write out the inode.
 224          */
 225         pctx.errcode = ext2fs_write_new_inode(fs, EXT2_ROOT_INO, &inode);
 226         if (pctx.errcode) {
 227                 pctx.str = "ext2fs_write_inode";
 228                 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
 229                 ctx->flags |= E2F_FLAG_ABORT;
 230                 return;
 231         }
 232
 233         /*
 234          * Miscellaneous bookkeeping...
 235          */
 236         e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO);
 237         ext2fs_icount_store(ctx->inode_count, EXT2_ROOT_INO, 2);
 238         ext2fs_icount_store(ctx->inode_link_info, EXT2_ROOT_INO, 2);
 239
 240         ext2fs_mark_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO);
 241         ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, EXT2_ROOT_INO);
 242         ext2fs_mark_inode_bitmap2(fs->inode_map, EXT2_ROOT_INO);
 243         ext2fs_mark_ib_dirty(fs);
 244 }
 245
 246 /*
 247  * This subroutine is responsible for making sure that a particular
 248  * directory is connected to the root; if it isn't we trace it up as
 249  * far as we can go, and then offer to connect the resulting parent to
 250  * the lost+found.  We have to do loop detection; if we ever discover
 251  * a loop, we treat that as a disconnected directory and offer to
 252  * reparent it to lost+found.
 253  *
 254  * However, loop detection is expensive, because for very large
 255  * filesystems, the inode_loop_detect bitmap is huge, and clearing it
 256  * is non-trivial.  Loops in filesystems are also a rare error case,
 257  * and we shouldn't optimize for error cases.  So we try two passes of
 258  * the algorithm.  The first time, we ignore loop detection and merely
 259  * increment a counter; if the counter exceeds some extreme threshold,
 260  * then we try again with the loop detection bitmap enabled.
 261  */
 262 static int check_directory(e2fsck_t ctx, ext2_ino_t dir,
 263                            struct problem_context *pctx)
 264 {
 265         ext2_filsys     fs = ctx->fs;
 266         ext2_ino_t      ino = dir, parent;
 267         int             loop_pass = 0, parent_count = 0;
 268
 269         while (1) {
 270                 /*
 271                  * Mark this inode as being "done"; by the time we
 272                  * return from this function, the inode we either be
 273                  * verified as being connected to the directory tree,
 274                  * or we will have offered to reconnect this to
 275                  * lost+found.
 276                  *
 277                  * If it was marked done already, then we've reached a
 278                  * parent we've already checked.
 279                  */
 280                 if (ext2fs_mark_inode_bitmap2(inode_done_map, ino))
 281                         break;
 282
 283                 if (e2fsck_dir_info_get_parent(ctx, ino, &parent)) {
 284                         fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
 285                         return 0;
 286                 }
 287
 288                 /*
 289                  * If this directory doesn't have a parent, or we've
 290                  * seen the parent once already, then offer to
 291                  * reparent it to lost+found
 292                  */
 293                 if (!parent ||
 294                     (loop_pass &&
 295                      (ext2fs_test_inode_bitmap2(inode_loop_detect,
 296                                                parent)))) {
 297                         pctx->ino = ino;
 298                         if (fix_problem(ctx, PR_3_UNCONNECTED_DIR, pctx)) {
 299                                 if (e2fsck_reconnect_file(ctx, pctx->ino))
 300                                         ext2fs_unmark_valid(fs);
 301                                 else {
 302                                         fix_dotdot(ctx, pctx->ino,
 303                                                    ctx->lost_and_found);
 304                                         parent = ctx->lost_and_found;
 305                                 }
 306                         }
 307                         break;
 308                 }
 309                 ino = parent;
 310                 if (loop_pass) {
 311                         ext2fs_mark_inode_bitmap2(inode_loop_detect, ino);
 312                 } else if (parent_count++ > 2048) {
 313                         /*
 314                          * If we've run into a path depth that's
 315                          * greater than 2048, try again with the inode
 316                          * loop bitmap turned on and start from the
 317                          * top.
 318                          */
 319                         loop_pass = 1;
 320                         if (inode_loop_detect)
 321                                 ext2fs_clear_inode_bitmap(inode_loop_detect);
 322                         else {
 323                                 pctx->errcode = e2fsck_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), EXT2FS_BMAP64_AUTODIR, "inode_loop_detect", &inode_loop_detect);
 324                                 if (pctx->errcode) {
 325                                         pctx->num = 1;
 326                                         fix_problem(ctx,
 327                                     PR_3_ALLOCATE_IBITMAP_ERROR, pctx);
 328                                         ctx->flags |= E2F_FLAG_ABORT;
 329                                         return -1;
 330                                 }
 331                         }
 332                         ino = dir;
 333                 }
 334         }
 335
 336         /*
 337          * Make sure that .. and the parent directory are the same;
 338          * offer to fix it if not.
 339          */
 340         pctx->ino = dir;
 341         if (e2fsck_dir_info_get_dotdot(ctx, dir, &pctx->ino2) ||
 342             e2fsck_dir_info_get_parent(ctx, dir, &pctx->dir)) {
 343                 fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
 344                 return 0;
 345         }
 346         if (pctx->ino2 != pctx->dir) {
 347                 if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx))
 348                         fix_dotdot(ctx, dir, pctx->dir);
 349         }
 350         return 0;
 351 }
 352
 353 /*
 354  * This routine gets the lost_and_found inode, making it a directory
 355  * if necessary
 356  */
 357 ext2_ino_t e2fsck_get_lost_and_found(e2fsck_t ctx, int fix)
 358 {
 359         ext2_filsys fs = ctx->fs;
 360         ext2_ino_t                      ino;
 361         blk64_t                 blk;
 362         errcode_t               retval;
 363         struct ext2_inode       inode;
 364         char *                  block;
 365         static const char       name[] = "lost+found";
 366         struct  problem_context pctx;
 367
 368         if (ctx->lost_and_found)
 369                 return ctx->lost_and_found;
 370
 371         clear_problem_context(&pctx);
 372
 373         retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name,
 374                                sizeof(name)-1, 0, &ino);
 375         if (retval && !fix)
 376                 return 0;
 377         if (!retval) {
 378                 if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, ino)) {
 379                         ctx->lost_and_found = ino;
 380                         return ino;
 381                 }
 382
 383                 /* Lost+found isn't a directory! */
 384                 if (!fix)
 385                         return 0;
 386                 pctx.ino = ino;
 387                 if (!fix_problem(ctx, PR_3_LPF_NOTDIR, &pctx))
 388                         return 0;
 389
 390                 /* OK, unlink the old /lost+found file. */
 391                 pctx.errcode = ext2fs_unlink(fs, EXT2_ROOT_INO, name, ino, 0);
 392                 if (pctx.errcode) {
 393                         pctx.str = "ext2fs_unlink";
 394                         fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
 395                         return 0;
 396                 }
 397                 (void) e2fsck_dir_info_set_parent(ctx, ino, 0);
 398                 e2fsck_adjust_inode_count(ctx, ino, -1);
 399         } else if (retval != EXT2_ET_FILE_NOT_FOUND) {
 400                 pctx.errcode = retval;
 401                 fix_problem(ctx, PR_3_ERR_FIND_LPF, &pctx);
 402         }
 403         if (!fix_problem(ctx, PR_3_NO_LF_DIR, 0))
 404                 return 0;
 405
 406         /*
 407          * Read the inode and block bitmaps in; we'll be messing with
 408          * them.
 409          */
 410         e2fsck_read_bitmaps(ctx);
 411
 412         /*
 413          * First, find a free block
 414          */
 415         retval = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk);
 416         if (retval) {
 417                 pctx.errcode = retval;
 418                 fix_problem(ctx, PR_3_ERR_LPF_NEW_BLOCK, &pctx);
 419                 return 0;
 420         }
 421         ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
 422         ext2fs_block_alloc_stats2(fs, blk, +1);
 423
 424         /*
 425          * Next find a free inode.
 426          */
 427         retval = ext2fs_new_inode(fs, EXT2_ROOT_INO, 040700,
 428                                   ctx->inode_used_map, &ino);
 429         if (retval) {
 430                 pctx.errcode = retval;
 431                 fix_problem(ctx, PR_3_ERR_LPF_NEW_INODE, &pctx);
 432                 return 0;
 433         }
 434         ext2fs_mark_inode_bitmap2(ctx->inode_used_map, ino);
 435         ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, ino);
 436         ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
 437
 438         /*
 439          * Now let's create the actual data block for the inode
 440          */
 441         retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block);
 442         if (retval) {
 443                 pctx.errcode = retval;
 444                 fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx);
 445                 return 0;
 446         }
 447
 448         retval = ext2fs_write_dir_block3(fs, blk, block, 0);
 449         ext2fs_free_mem(&block);
 450         if (retval) {
 451                 pctx.errcode = retval;
 452                 fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx);
 453                 return 0;
 454         }
 455
 456         /*
 457          * Set up the inode structure
 458          */
 459         memset(&inode, 0, sizeof(inode));
 460         inode.i_mode = 040700;
 461         inode.i_size = fs->blocksize;
 462         inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now;
 463         inode.i_links_count = 2;
 464         ext2fs_iblk_set(fs, &inode, 1);
 465         inode.i_block[0] = blk;
 466
 467         /*
 468          * Next, write out the inode.
 469          */
 470         pctx.errcode = ext2fs_write_new_inode(fs, ino, &inode);
 471         if (pctx.errcode) {
 472                 pctx.str = "ext2fs_write_inode";
 473                 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
 474                 return 0;
 475         }
 476         /*
 477          * Finally, create the directory link
 478          */
 479         pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, EXT2_FT_DIR);
 480         if (pctx.errcode) {
 481                 pctx.str = "ext2fs_link";
 482                 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
 483                 return 0;
 484         }
 485
 486         /*
 487          * Miscellaneous bookkeeping that needs to be kept straight.
 488          */
 489         e2fsck_add_dir_info(ctx, ino, EXT2_ROOT_INO);
 490         e2fsck_adjust_inode_count(ctx, EXT2_ROOT_INO, 1);
 491         ext2fs_icount_store(ctx->inode_count, ino, 2);
 492         ext2fs_icount_store(ctx->inode_link_info, ino, 2);
 493         ctx->lost_and_found = ino;
 494         quota_data_add(ctx->qctx, &inode, ino, fs->blocksize);
 495         quota_data_inodes(ctx->qctx, &inode, ino, +1);
 496 #if 0
 497         printf("/lost+found created; inode #%lu\n", ino);
 498 #endif
 499         return ino;
 500 }
 501
 502 /*
 503  * This routine will connect a file to lost+found
 504  */
 505 int e2fsck_reconnect_file(e2fsck_t ctx, ext2_ino_t ino)
 506 {
 507         ext2_filsys fs = ctx->fs;
 508         errcode_t       retval;
 509         char            name[80];
 510         struct problem_context  pctx;
 511         struct ext2_inode       inode;
 512         int             file_type = 0;
 513
 514         clear_problem_context(&pctx);
 515         pctx.ino = ino;
 516
 517         if (!ctx->bad_lost_and_found && !ctx->lost_and_found) {
 518                 if (e2fsck_get_lost_and_found(ctx, 1) == 0)
 519                         ctx->bad_lost_and_found++;
 520         }
 521         if (ctx->bad_lost_and_found) {
 522                 fix_problem(ctx, PR_3_NO_LPF, &pctx);
 523                 return 1;
 524         }
 525
 526         sprintf(name, "#%u", ino);
 527         if (ext2fs_read_inode(fs, ino, &inode) == 0)
 528                 file_type = ext2_file_type(inode.i_mode);
 529         retval = ext2fs_link(fs, ctx->lost_and_found, name, ino, file_type);
 530         if (retval == EXT2_ET_DIR_NO_SPACE) {
 531                 if (!fix_problem(ctx, PR_3_EXPAND_LF_DIR, &pctx))
 532                         return 1;
 533                 retval = e2fsck_expand_directory(ctx, ctx->lost_and_found,
 534                                                  1, 0);
 535                 if (retval) {
 536                         pctx.errcode = retval;
 537                         fix_problem(ctx, PR_3_CANT_EXPAND_LPF, &pctx);
 538                         return 1;
 539                 }
 540                 retval = ext2fs_link(fs, ctx->lost_and_found, name,
 541                                      ino, file_type);
 542         }
 543         if (retval) {
 544                 pctx.errcode = retval;
 545                 fix_problem(ctx, PR_3_CANT_RECONNECT, &pctx);
 546                 return 1;
 547         }
 548         e2fsck_adjust_inode_count(ctx, ino, 1);
 549
 550         return 0;
 551 }
 552
 553 /*
 554  * Utility routine to adjust the inode counts on an inode.
 555  */
 556 errcode_t e2fsck_adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj)
 557 {
 558         ext2_filsys fs = ctx->fs;
 559         errcode_t               retval;
 560         struct ext2_inode       inode;
 561
 562         if (!ino)
 563                 return 0;
 564
 565         retval = ext2fs_read_inode(fs, ino, &inode);
 566         if (retval)
 567                 return retval;
 568
 569 #if 0
 570         printf("Adjusting link count for inode %lu by %d (from %d)\n", ino, adj,
 571                inode.i_links_count);
 572 #endif
 573
 574         if (adj == 1) {
 575                 ext2fs_icount_increment(ctx->inode_count, ino, 0);
 576                 if (inode.i_links_count == (__u16) ~0)
 577                         return 0;
 578                 ext2fs_icount_increment(ctx->inode_link_info, ino, 0);
 579                 inode.i_links_count++;
 580         } else if (adj == -1) {
 581                 ext2fs_icount_decrement(ctx->inode_count, ino, 0);
 582                 if (inode.i_links_count == 0)
 583                         return 0;
 584                 ext2fs_icount_decrement(ctx->inode_link_info, ino, 0);
 585                 inode.i_links_count--;
 586         }
 587
 588         retval = ext2fs_write_inode(fs, ino, &inode);
 589         if (retval)
 590                 return retval;
 591
 592         return 0;
 593 }
 594
 595 /*
 596  * Fix parent --- this routine fixes up the parent of a directory.
 597  */
 598 struct fix_dotdot_struct {
 599         ext2_filsys     fs;
 600         ext2_ino_t      parent;
 601         int             done;
 602         e2fsck_t        ctx;
 603 };
 604
 605 static int fix_dotdot_proc(struct ext2_dir_entry *dirent,
 606                            int  offset EXT2FS_ATTR((unused)),
 607                            int  blocksize EXT2FS_ATTR((unused)),
 608                            char *buf EXT2FS_ATTR((unused)),
 609                            void *priv_data)
 610 {
 611         struct fix_dotdot_struct *fp = (struct fix_dotdot_struct *) priv_data;
 612         errcode_t       retval;
 613         struct problem_context pctx;
 614
 615         if ((dirent->name_len & 0xFF) != 2)
 616                 return 0;
 617         if (strncmp(dirent->name, "..", 2))
 618                 return 0;
 619
 620         clear_problem_context(&pctx);
 621
 622         retval = e2fsck_adjust_inode_count(fp->ctx, dirent->inode, -1);
 623         if (retval) {
 624                 pctx.errcode = retval;
 625                 fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx);
 626         }
 627         retval = e2fsck_adjust_inode_count(fp->ctx, fp->parent, 1);
 628         if (retval) {
 629                 pctx.errcode = retval;
 630                 fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx);
 631         }
 632         dirent->inode = fp->parent;
 633         if (fp->ctx->fs->super->s_feature_incompat &
 634             EXT2_FEATURE_INCOMPAT_FILETYPE)
 635                 dirent->name_len = (dirent->name_len & 0xFF) |
 636                         (EXT2_FT_DIR << 8);
 637         else
 638                 dirent->name_len = dirent->name_len & 0xFF;
 639
 640         fp->done++;
 641         return DIRENT_ABORT | DIRENT_CHANGED;
 642 }
 643
 644 static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent)
 645 {
 646         ext2_filsys fs = ctx->fs;
 647         errcode_t       retval;
 648         struct fix_dotdot_struct fp;
 649         struct problem_context pctx;
 650
 651         fp.fs = fs;
 652         fp.parent = parent;
 653         fp.done = 0;
 654         fp.ctx = ctx;
 655
 656 #if 0
 657         printf("Fixing '..' of inode %lu to be %lu...\n", ino, parent);
 658 #endif
 659
 660         clear_problem_context(&pctx);
 661         pctx.ino = ino;
 662         retval = ext2fs_dir_iterate(fs, ino, DIRENT_FLAG_INCLUDE_EMPTY,
 663                                     0, fix_dotdot_proc, &fp);
 664         if (retval || !fp.done) {
 665                 pctx.errcode = retval;
 666                 fix_problem(ctx, retval ? PR_3_FIX_PARENT_ERR :
 667                             PR_3_FIX_PARENT_NOFIND, &pctx);
 668                 ext2fs_unmark_valid(fs);
 669         }
 670         (void) e2fsck_dir_info_set_dotdot(ctx, ino, parent);
 671         if (e2fsck_dir_info_set_parent(ctx, ino, ctx->lost_and_found))
 672                 fix_problem(ctx, PR_3_NO_DIRINFO, &pctx);
 673
 674         return;
 675 }
 676
 677 /*
 678  * These routines are responsible for expanding a /lost+found if it is
 679  * too small.
 680  */
 681
 682 struct expand_dir_struct {
 683         blk64_t                 num;
 684         e2_blkcnt_t             guaranteed_size;
 685         blk64_t                 newblocks;
 686         blk64_t                 last_block;
 687         errcode_t               err;
 688         e2fsck_t                ctx;
 689 };
 690
 691 static int expand_dir_proc(ext2_filsys fs,
 692                            blk64_t      *blocknr,
 693                            e2_blkcnt_t  blockcnt,
 694                            blk64_t ref_block EXT2FS_ATTR((unused)),
 695                            int ref_offset EXT2FS_ATTR((unused)),
 696                            void *priv_data)
 697 {
 698         struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
 699         blk64_t new_blk;
 700         static blk64_t  last_blk = 0;
 701         char            *block;
 702         errcode_t       retval;
 703         e2fsck_t        ctx;
 704
 705         ctx = es->ctx;
 706
 707         if (es->guaranteed_size && blockcnt >= es->guaranteed_size)
 708                 return BLOCK_ABORT;
 709
 710         if (blockcnt > 0)
 711                 es->last_block = blockcnt;
 712         if (*blocknr) {
 713                 last_blk = *blocknr;
 714                 return 0;
 715         }
 716         retval = ext2fs_new_block2(fs, last_blk, ctx->block_found_map,
 717                                   &new_blk);
 718         if (retval) {
 719                 es->err = retval;
 720                 return BLOCK_ABORT;
 721         }
 722         if (blockcnt > 0) {
 723                 retval = ext2fs_new_dir_block(fs, 0, 0, &block);
 724                 if (retval) {
 725                         es->err = retval;
 726                         return BLOCK_ABORT;
 727                 }
 728                 es->num--;
 729                 retval = ext2fs_write_dir_block3(fs, new_blk, block, 0);
 730         } else {
 731                 retval = ext2fs_get_mem(fs->blocksize, &block);
 732                 if (retval) {
 733                         es->err = retval;
 734                         return BLOCK_ABORT;
 735                 }
 736                 memset(block, 0, fs->blocksize);
 737                 retval = io_channel_write_blk64(fs->io, new_blk, 1, block);
 738         }
 739         if (retval) {
 740                 es->err = retval;
 741                 return BLOCK_ABORT;
 742         }
 743         ext2fs_free_mem(&block);
 744         *blocknr = new_blk;
 745         ext2fs_mark_block_bitmap2(ctx->block_found_map, new_blk);
 746         ext2fs_block_alloc_stats2(fs, new_blk, +1);
 747         es->newblocks++;
 748
 749         if (es->num == 0)
 750                 return (BLOCK_CHANGED | BLOCK_ABORT);
 751         else
 752                 return BLOCK_CHANGED;
 753 }
 754
 755 /*
 756  * Ensure that all blocks are marked in the block_found_map, since it's
 757  * possible that the library allocated an extent node block or a block map
 758  * block during the directory rebuilding; these new allocations are not
 759  * captured in block_found_map.  This is bad since we could later use
 760  * block_found_map to allocate more blocks.
 761  */
 762 static int find_new_blocks_proc(ext2_filsys fs,
 763                                 blk64_t *blocknr,
 764                                 e2_blkcnt_t     blockcnt,
 765                                 blk64_t ref_block EXT2FS_ATTR((unused)),
 766                                 int ref_offset EXT2FS_ATTR((unused)),
 767                                 void    *priv_data)
 768 {
 769         struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
 770         e2fsck_t        ctx = es->ctx;
 771
 772         ext2fs_mark_block_bitmap2(ctx->block_found_map, *blocknr);
 773         return 0;
 774 }
 775
 776 errcode_t e2fsck_expand_directory(e2fsck_t ctx, ext2_ino_t dir,
 777                                   int num, int guaranteed_size)
 778 {
 779         ext2_filsys fs = ctx->fs;
 780         errcode_t       retval;
 781         struct expand_dir_struct es;
 782         struct ext2_inode       inode;
 783         blk64_t         sz, before, after;
 784
 785         if (!(fs->flags & EXT2_FLAG_RW))
 786                 return EXT2_ET_RO_FILSYS;
 787
 788         /*
 789          * Read the inode and block bitmaps in; we'll be messing with
 790          * them.
 791          */
 792         e2fsck_read_bitmaps(ctx);
 793
 794         retval = ext2fs_check_directory(fs, dir);
 795         if (retval)
 796                 return retval;
 797
 798         es.num = num;
 799         es.guaranteed_size = guaranteed_size;
 800         es.last_block = 0;
 801         es.err = 0;
 802         es.newblocks = 0;
 803         es.ctx = ctx;
 804
 805         before = ext2fs_free_blocks_count(fs->super);
 806         retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND,
 807                                        0, expand_dir_proc, &es);
 808
 809         if (es.err)
 810                 return es.err;
 811         after = ext2fs_free_blocks_count(fs->super);
 812
 813         /*
 814          * If the free block count has dropped by more than the blocks we
 815          * allocated ourselves, then we must've allocated some extent/map
 816          * blocks.  Therefore, we must iterate this dir's blocks again to
 817          * ensure that all newly allocated blocks are captured in
 818          * block_found_map.
 819          */
 820         if ((before - after) > es.newblocks) {
 821                 retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_READ_ONLY,
 822                                                0, find_new_blocks_proc, &es);
 823                 if (es.err)
 824                         return es.err;
 825         }
 826
 827         /*
 828          * Update the size and block count fields in the inode.
 829          */
 830         retval = ext2fs_read_inode(fs, dir, &inode);
 831         if (retval)
 832                 return retval;
 833
 834         sz = (es.last_block + 1) * fs->blocksize;
 835         inode.i_size = sz;
 836         inode.i_size_high = sz >> 32;
 837         ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
 838         quota_data_add(ctx->qctx, &inode, dir, es.newblocks * fs->blocksize);
 839
 840         e2fsck_write_inode(ctx, dir, &inode, "expand_directory");
 841
 842         return 0;
 843 }
 844