e2fsck/pass2.c

   1 /*
   2  * pass2.c --- check directory structure
   3  *
   4  * Copyright (C) 1993, 1994, 1995, 1996, 1997 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 2 of e2fsck iterates through all active directory inodes, and
  12  * applies to following tests to each directory entry in the directory
  13  * blocks in the inodes:
  14  *
  15  *      - The length of the directory entry (rec_len) should be at
  16  *              least 8 bytes, and no more than the remaining space
  17  *              left in the directory block.
  18  *      - The length of the name in the directory entry (name_len)
  19  *              should be less than (rec_len - 8).
  20  *      - The inode number in the directory entry should be within
  21  *              legal bounds.
  22  *      - The inode number should refer to a in-use inode.
  23  *      - The first entry should be '.', and its inode should be
  24  *              the inode of the directory.
  25  *      - The second entry should be '..'.
  26  *
  27  * To minimize disk seek time, the directory blocks are processed in
  28  * sorted order of block numbers.
  29  *
  30  * Pass 2 also collects the following information:
  31  *      - The inode numbers of the subdirectories for each directory.
  32  *
  33  * Pass 2 relies on the following information from previous passes:
  34  *      - The directory information collected in pass 1.
  35  *      - The inode_used_map bitmap
  36  *      - The inode_bad_map bitmap
  37  *      - The inode_dir_map bitmap
  38  *
  39  * Pass 2 frees the following data structures
  40  *      - The inode_bad_map bitmap
  41  *      - The inode_reg_map bitmap
  42  */
  43
  44 #define _GNU_SOURCE 1 /* get strnlen() */
  45 #include <string.h>
  46
  47 #include "e2fsck.h"
  48 #include "problem.h"
  49 #include "dict.h"
  50
  51 #ifdef NO_INLINE_FUNCS
  52 #define _INLINE_
  53 #else
  54 #define _INLINE_ inline
  55 #endif
  56
  57 /* #define DX_DEBUG */
  58
  59 /*
  60  * Keeps track of how many times an inode is referenced.
  61  */
  62 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf);
  63 static int check_dir_block(ext2_filsys fs,
  64                            struct ext2_db_entry *dir_blocks_info,
  65                            void *priv_data);
  66 static int allocate_dir_block(e2fsck_t ctx,
  67                               struct ext2_db_entry *dir_blocks_info,
  68                               char *buf, struct problem_context *pctx);
  69 static int update_dir_block(ext2_filsys fs,
  70                             blk_t       *block_nr,
  71                             e2_blkcnt_t blockcnt,
  72                             blk_t       ref_block,
  73                             int         ref_offset,
  74                             void        *priv_data);
  75 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino);
  76 static int htree_depth(struct dx_dir_info *dx_dir,
  77                        struct dx_dirblock_info *dx_db);
  78 static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b);
  79
  80 struct check_dir_struct {
  81         char *buf;
  82         struct problem_context  pctx;
  83         int     count, max;
  84         e2fsck_t ctx;
  85 };
  86
  87 void e2fsck_pass2(e2fsck_t ctx)
  88 {
  89         struct ext2_super_block *sb = ctx->fs->super;
  90         struct problem_context  pctx;
  91         ext2_filsys             fs = ctx->fs;
  92         char                    *buf;
  93 #ifdef RESOURCE_TRACK
  94         struct resource_track   rtrack;
  95 #endif
  96         struct check_dir_struct cd;
  97         struct dx_dir_info      *dx_dir;
  98         struct dx_dirblock_info *dx_db, *dx_parent;
  99         int                     b;
 100         int                     i, depth;
 101         problem_t               code;
 102         int                     bad_dir;
 103
 104 #ifdef RESOURCE_TRACK
 105         init_resource_track(&rtrack, ctx->fs->io);
 106 #endif
 107
 108         clear_problem_context(&cd.pctx);
 109
 110 #ifdef MTRACE
 111         mtrace_print("Pass 2");
 112 #endif
 113
 114         if (!(ctx->options & E2F_OPT_PREEN))
 115                 fix_problem(ctx, PR_2_PASS_HEADER, &cd.pctx);
 116
 117         e2fsck_setup_tdb_icount(ctx, EXT2_ICOUNT_OPT_INCREMENT,
 118                                 &ctx->inode_count);
 119         if (ctx->inode_count)
 120                 cd.pctx.errcode = 0;
 121         else
 122                 cd.pctx.errcode = ext2fs_create_icount2(fs,
 123                                                 EXT2_ICOUNT_OPT_INCREMENT,
 124                                                 0, ctx->inode_link_info,
 125                                                 &ctx->inode_count);
 126         if (cd.pctx.errcode) {
 127                 fix_problem(ctx, PR_2_ALLOCATE_ICOUNT, &cd.pctx);
 128                 ctx->flags |= E2F_FLAG_ABORT;
 129                 return;
 130         }
 131         buf = (char *) e2fsck_allocate_memory(ctx, 2*fs->blocksize,
 132                                               "directory scan buffer");
 133
 134         /*
 135          * Set up the parent pointer for the root directory, if
 136          * present.  (If the root directory is not present, we will
 137          * create it in pass 3.)
 138          */
 139         (void) e2fsck_dir_info_set_parent(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO);
 140
 141         cd.buf = buf;
 142         cd.ctx = ctx;
 143         cd.count = 1;
 144         cd.max = ext2fs_dblist_count(fs->dblist);
 145
 146         if (ctx->progress)
 147                 (void) (ctx->progress)(ctx, 2, 0, cd.max);
 148
 149         if (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX)
 150                 ext2fs_dblist_sort(fs->dblist, special_dir_block_cmp);
 151
 152         cd.pctx.errcode = ext2fs_dblist_iterate(fs->dblist, check_dir_block,
 153                                                 &cd);
 154         if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
 155                 return;
 156         if (cd.pctx.errcode) {
 157                 fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
 158                 ctx->flags |= E2F_FLAG_ABORT;
 159                 return;
 160         }
 161
 162 #ifdef ENABLE_HTREE
 163         for (i=0; (dx_dir = e2fsck_dx_dir_info_iter(ctx, &i)) != 0;) {
 164                 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 165                         return;
 166                 if (dx_dir->numblocks == 0)
 167                         continue;
 168                 clear_problem_context(&pctx);
 169                 bad_dir = 0;
 170                 pctx.dir = dx_dir->ino;
 171                 dx_db = dx_dir->dx_block;
 172                 if (dx_db->flags & DX_FLAG_REFERENCED)
 173                         dx_db->flags |= DX_FLAG_DUP_REF;
 174                 else
 175                         dx_db->flags |= DX_FLAG_REFERENCED;
 176                 /*
 177                  * Find all of the first and last leaf blocks, and
 178                  * update their parent's min and max hash values
 179                  */
 180                 for (b=0, dx_db = dx_dir->dx_block;
 181                      b < dx_dir->numblocks;
 182                      b++, dx_db++) {
 183                         if ((dx_db->type != DX_DIRBLOCK_LEAF) ||
 184                             !(dx_db->flags & (DX_FLAG_FIRST | DX_FLAG_LAST)))
 185                                 continue;
 186                         dx_parent = &dx_dir->dx_block[dx_db->parent];
 187                         /*
 188                          * XXX Make sure dx_parent->min_hash > dx_db->min_hash
 189                          */
 190                         if (dx_db->flags & DX_FLAG_FIRST)
 191                                 dx_parent->min_hash = dx_db->min_hash;
 192                         /*
 193                          * XXX Make sure dx_parent->max_hash < dx_db->max_hash
 194                          */
 195                         if (dx_db->flags & DX_FLAG_LAST)
 196                                 dx_parent->max_hash = dx_db->max_hash;
 197                 }
 198
 199                 for (b=0, dx_db = dx_dir->dx_block;
 200                      b < dx_dir->numblocks;
 201                      b++, dx_db++) {
 202                         pctx.blkcount = b;
 203                         pctx.group = dx_db->parent;
 204                         code = 0;
 205                         if (!(dx_db->flags & DX_FLAG_FIRST) &&
 206                             (dx_db->min_hash < dx_db->node_min_hash)) {
 207                                 pctx.blk = dx_db->min_hash;
 208                                 pctx.blk2 = dx_db->node_min_hash;
 209                                 code = PR_2_HTREE_MIN_HASH;
 210                                 fix_problem(ctx, code, &pctx);
 211                                 bad_dir++;
 212                         }
 213                         if (dx_db->type == DX_DIRBLOCK_LEAF) {
 214                                 depth = htree_depth(dx_dir, dx_db);
 215                                 if (depth != dx_dir->depth) {
 216                                         pctx.num = dx_dir->depth;
 217                                         code = PR_2_HTREE_BAD_DEPTH;
 218                                         fix_problem(ctx, code, &pctx);
 219                                         bad_dir++;
 220                                 }
 221                         }
 222                         /*
 223                          * This test doesn't apply for the root block
 224                          * at block #0
 225                          */
 226                         if (b &&
 227                             (dx_db->max_hash > dx_db->node_max_hash)) {
 228                                 pctx.blk = dx_db->max_hash;
 229                                 pctx.blk2 = dx_db->node_max_hash;
 230                                 code = PR_2_HTREE_MAX_HASH;
 231                                 fix_problem(ctx, code, &pctx);
 232                                 bad_dir++;
 233                         }
 234                         if (!(dx_db->flags & DX_FLAG_REFERENCED)) {
 235                                 code = PR_2_HTREE_NOTREF;
 236                                 fix_problem(ctx, code, &pctx);
 237                                 bad_dir++;
 238                         } else if (dx_db->flags & DX_FLAG_DUP_REF) {
 239                                 code = PR_2_HTREE_DUPREF;
 240                                 fix_problem(ctx, code, &pctx);
 241                                 bad_dir++;
 242                         }
 243                         if (code == 0)
 244                                 continue;
 245                 }
 246                 if (bad_dir && fix_problem(ctx, PR_2_HTREE_CLEAR, &pctx)) {
 247                         clear_htree(ctx, dx_dir->ino);
 248                         dx_dir->numblocks = 0;
 249                 }
 250         }
 251 #endif
 252         ext2fs_free_mem(&buf);
 253         ext2fs_free_dblist(fs->dblist);
 254
 255         if (ctx->inode_bad_map) {
 256                 ext2fs_free_inode_bitmap(ctx->inode_bad_map);
 257                 ctx->inode_bad_map = 0;
 258         }
 259         if (ctx->inode_reg_map) {
 260                 ext2fs_free_inode_bitmap(ctx->inode_reg_map);
 261                 ctx->inode_reg_map = 0;
 262         }
 263
 264         clear_problem_context(&pctx);
 265         if (ctx->large_files) {
 266                 if (!(sb->s_feature_ro_compat &
 267                       EXT2_FEATURE_RO_COMPAT_LARGE_FILE) &&
 268                     fix_problem(ctx, PR_2_FEATURE_LARGE_FILES, &pctx)) {
 269                         sb->s_feature_ro_compat |=
 270                                 EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
 271                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 272                         ext2fs_mark_super_dirty(fs);
 273                 }
 274                 if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 275                     fix_problem(ctx, PR_1_FS_REV_LEVEL, &pctx)) {
 276                         ext2fs_update_dynamic_rev(fs);
 277                         ext2fs_mark_super_dirty(fs);
 278                 }
 279         }
 280
 281 #ifdef RESOURCE_TRACK
 282         if (ctx->options & E2F_OPT_TIME2) {
 283                 e2fsck_clear_progbar(ctx);
 284                 print_resource_track(_("Pass 2"), &rtrack, fs->io);
 285         }
 286 #endif
 287 }
 288
 289 #define MAX_DEPTH 32000
 290 static int htree_depth(struct dx_dir_info *dx_dir,
 291                        struct dx_dirblock_info *dx_db)
 292 {
 293         int     depth = 0;
 294
 295         while (dx_db->type != DX_DIRBLOCK_ROOT && depth < MAX_DEPTH) {
 296                 dx_db = &dx_dir->dx_block[dx_db->parent];
 297                 depth++;
 298         }
 299         return depth;
 300 }
 301
 302 static int dict_de_cmp(const void *a, const void *b)
 303 {
 304         const struct ext2_dir_entry *de_a, *de_b;
 305         int     a_len, b_len;
 306
 307         de_a = (const struct ext2_dir_entry *) a;
 308         a_len = de_a->name_len & 0xFF;
 309         de_b = (const struct ext2_dir_entry *) b;
 310         b_len = de_b->name_len & 0xFF;
 311
 312         if (a_len != b_len)
 313                 return (a_len - b_len);
 314
 315         return strncmp(de_a->name, de_b->name, a_len);
 316 }
 317
 318 /*
 319  * This is special sort function that makes sure that directory blocks
 320  * with a dirblock of zero are sorted to the beginning of the list.
 321  * This guarantees that the root node of the htree directories are
 322  * processed first, so we know what hash version to use.
 323  */
 324 static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b)
 325 {
 326         const struct ext2_db_entry *db_a =
 327                 (const struct ext2_db_entry *) a;
 328         const struct ext2_db_entry *db_b =
 329                 (const struct ext2_db_entry *) b;
 330
 331         if (db_a->blockcnt && !db_b->blockcnt)
 332                 return 1;
 333
 334         if (!db_a->blockcnt && db_b->blockcnt)
 335                 return -1;
 336
 337         if (db_a->blk != db_b->blk)
 338                 return (int) (db_a->blk - db_b->blk);
 339
 340         if (db_a->ino != db_b->ino)
 341                 return (int) (db_a->ino - db_b->ino);
 342
 343         return (int) (db_a->blockcnt - db_b->blockcnt);
 344 }
 345
 346
 347 /*
 348  * Make sure the first entry in the directory is '.', and that the
 349  * directory entry is sane.
 350  */
 351 static int check_dot(e2fsck_t ctx,
 352                      struct ext2_dir_entry *dirent,
 353                      ext2_ino_t ino, struct problem_context *pctx)
 354 {
 355         struct ext2_dir_entry *nextdir;
 356         int     status = 0;
 357         int     created = 0;
 358         int     rec_len, new_len;
 359         int     problem = 0;
 360
 361         if (!dirent->inode)
 362                 problem = PR_2_MISSING_DOT;
 363         else if (((dirent->name_len & 0xFF) != 1) ||
 364                  (dirent->name[0] != '.'))
 365                 problem = PR_2_1ST_NOT_DOT;
 366         else if (dirent->name[1] != '\0')
 367                 problem = PR_2_DOT_NULL_TERM;
 368
 369         rec_len = (dirent->rec_len || ctx->fs->blocksize < 65536) ?
 370                 dirent->rec_len : 65536;
 371         if (problem) {
 372                 if (fix_problem(ctx, problem, pctx)) {
 373                         if (rec_len < 12)
 374                                 rec_len = dirent->rec_len = 12;
 375                         dirent->inode = ino;
 376                         dirent->name_len = 1;
 377                         dirent->name[0] = '.';
 378                         dirent->name[1] = '\0';
 379                         status = 1;
 380                         created = 1;
 381                 }
 382         }
 383         if (dirent->inode != ino) {
 384                 if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
 385                         dirent->inode = ino;
 386                         status = 1;
 387                 }
 388         }
 389         if (rec_len > 12) {
 390                 new_len = rec_len - 12;
 391                 if (new_len > 12) {
 392                         if (created ||
 393                             fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
 394                                 nextdir = (struct ext2_dir_entry *)
 395                                         ((char *) dirent + 12);
 396                                 dirent->rec_len = 12;
 397                                 nextdir->rec_len = new_len;
 398                                 nextdir->inode = 0;
 399                                 nextdir->name_len = 0;
 400                                 status = 1;
 401                         }
 402                 }
 403         }
 404         return status;
 405 }
 406
 407 /*
 408  * Make sure the second entry in the directory is '..', and that the
 409  * directory entry is sane.  We do not check the inode number of '..'
 410  * here; this gets done in pass 3.
 411  */
 412 static int check_dotdot(e2fsck_t ctx,
 413                         struct ext2_dir_entry *dirent,
 414                         ext2_ino_t ino, struct problem_context *pctx)
 415 {
 416         int     rec_len, problem = 0;
 417
 418         if (!dirent->inode)
 419                 problem = PR_2_MISSING_DOT_DOT;
 420         else if (((dirent->name_len & 0xFF) != 2) ||
 421                  (dirent->name[0] != '.') ||
 422                  (dirent->name[1] != '.'))
 423                 problem = PR_2_2ND_NOT_DOT_DOT;
 424         else if (dirent->name[2] != '\0')
 425                 problem = PR_2_DOT_DOT_NULL_TERM;
 426
 427         rec_len = (dirent->rec_len || ctx->fs->blocksize < 65536) ?
 428                 dirent->rec_len : 65536;
 429         if (problem) {
 430                 if (fix_problem(ctx, problem, pctx)) {
 431                         if (rec_len < 12)
 432                                 dirent->rec_len = 12;
 433                         /*
 434                          * Note: we don't have the parent inode just
 435                          * yet, so we will fill it in with the root
 436                          * inode.  This will get fixed in pass 3.
 437                          */
 438                         dirent->inode = EXT2_ROOT_INO;
 439                         dirent->name_len = 2;
 440                         dirent->name[0] = '.';
 441                         dirent->name[1] = '.';
 442                         dirent->name[2] = '\0';
 443                         return 1;
 444                 }
 445                 return 0;
 446         }
 447         if (e2fsck_dir_info_set_dotdot(ctx, ino, dirent->inode)) {
 448                 fix_problem(ctx, PR_2_NO_DIRINFO, pctx);
 449                 return -1;
 450         }
 451         return 0;
 452 }
 453
 454 /*
 455  * Check to make sure a directory entry doesn't contain any illegal
 456  * characters.
 457  */
 458 static int check_name(e2fsck_t ctx,
 459                       struct ext2_dir_entry *dirent,
 460                       ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 461                       struct problem_context *pctx)
 462 {
 463         int     i;
 464         int     fixup = -1;
 465         int     ret = 0;
 466
 467         for ( i = 0; i < (dirent->name_len & 0xFF); i++) {
 468                 if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
 469                         if (fixup < 0) {
 470                                 fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
 471                         }
 472                         if (fixup) {
 473                                 dirent->name[i] = '.';
 474                                 ret = 1;
 475                         }
 476                 }
 477         }
 478         return ret;
 479 }
 480
 481 /*
 482  * Check the directory filetype (if present)
 483  */
 484 static _INLINE_ int check_filetype(e2fsck_t ctx,
 485                                    struct ext2_dir_entry *dirent,
 486                                    ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 487                                    struct problem_context *pctx)
 488 {
 489         int     filetype = dirent->name_len >> 8;
 490         int     should_be = EXT2_FT_UNKNOWN;
 491         struct ext2_inode       inode;
 492
 493         if (!(ctx->fs->super->s_feature_incompat &
 494               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 495                 if (filetype == 0 ||
 496                     !fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
 497                         return 0;
 498                 dirent->name_len = dirent->name_len & 0xFF;
 499                 return 1;
 500         }
 501
 502         if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, dirent->inode)) {
 503                 should_be = EXT2_FT_DIR;
 504         } else if (ext2fs_test_inode_bitmap(ctx->inode_reg_map,
 505                                             dirent->inode)) {
 506                 should_be = EXT2_FT_REG_FILE;
 507         } else if (ctx->inode_bad_map &&
 508                    ext2fs_test_inode_bitmap(ctx->inode_bad_map,
 509                                             dirent->inode))
 510                 should_be = 0;
 511         else {
 512                 e2fsck_read_inode(ctx, dirent->inode, &inode,
 513                                   "check_filetype");
 514                 should_be = ext2_file_type(inode.i_mode);
 515         }
 516         if (filetype == should_be)
 517                 return 0;
 518         pctx->num = should_be;
 519
 520         if (fix_problem(ctx, filetype ? PR_2_BAD_FILETYPE : PR_2_SET_FILETYPE,
 521                         pctx) == 0)
 522                 return 0;
 523
 524         dirent->name_len = (dirent->name_len & 0xFF) | should_be << 8;
 525         return 1;
 526 }
 527
 528 #ifdef ENABLE_HTREE
 529 static void parse_int_node(ext2_filsys fs,
 530                            struct ext2_db_entry *db,
 531                            struct check_dir_struct *cd,
 532                            struct dx_dir_info   *dx_dir,
 533                            char *block_buf)
 534 {
 535         struct          ext2_dx_root_info  *root;
 536         struct          ext2_dx_entry *ent;
 537         struct          ext2_dx_countlimit *limit;
 538         struct dx_dirblock_info *dx_db;
 539         int             i, expect_limit, count;
 540         blk_t           blk;
 541         ext2_dirhash_t  min_hash = 0xffffffff;
 542         ext2_dirhash_t  max_hash = 0;
 543         ext2_dirhash_t  hash = 0, prev_hash;
 544
 545         if (db->blockcnt == 0) {
 546                 root = (struct ext2_dx_root_info *) (block_buf + 24);
 547
 548 #ifdef DX_DEBUG
 549                 printf("Root node dump:\n");
 550                 printf("\t Reserved zero: %u\n", root->reserved_zero);
 551                 printf("\t Hash Version: %d\n", root->hash_version);
 552                 printf("\t Info length: %d\n", root->info_length);
 553                 printf("\t Indirect levels: %d\n", root->indirect_levels);
 554                 printf("\t Flags: %d\n", root->unused_flags);
 555 #endif
 556
 557                 ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length);
 558         } else {
 559                 ent = (struct ext2_dx_entry *) (block_buf+8);
 560         }
 561         limit = (struct ext2_dx_countlimit *) ent;
 562
 563 #ifdef DX_DEBUG
 564         printf("Number of entries (count): %d\n",
 565                ext2fs_le16_to_cpu(limit->count));
 566         printf("Number of entries (limit): %d\n",
 567                ext2fs_le16_to_cpu(limit->limit));
 568 #endif
 569
 570         count = ext2fs_le16_to_cpu(limit->count);
 571         expect_limit = (fs->blocksize - ((char *) ent - block_buf)) /
 572                 sizeof(struct ext2_dx_entry);
 573         if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
 574                 cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
 575                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
 576                         goto clear_and_exit;
 577         }
 578         if (count > expect_limit) {
 579                 cd->pctx.num = count;
 580                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_COUNT, &cd->pctx))
 581                         goto clear_and_exit;
 582                 count = expect_limit;
 583         }
 584
 585         for (i=0; i < count; i++) {
 586                 prev_hash = hash;
 587                 hash = i ? (ext2fs_le32_to_cpu(ent[i].hash) & ~1) : 0;
 588 #ifdef DX_DEBUG
 589                 printf("Entry #%d: Hash 0x%08x, block %u\n", i,
 590                        hash, ext2fs_le32_to_cpu(ent[i].block));
 591 #endif
 592                 blk = ext2fs_le32_to_cpu(ent[i].block) & 0x0ffffff;
 593                 /* Check to make sure the block is valid */
 594                 if (blk >= (blk_t) dx_dir->numblocks) {
 595                         cd->pctx.blk = blk;
 596                         if (fix_problem(cd->ctx, PR_2_HTREE_BADBLK,
 597                                         &cd->pctx))
 598                                 goto clear_and_exit;
 599                         continue;
 600                 }
 601                 if (hash < prev_hash &&
 602                     fix_problem(cd->ctx, PR_2_HTREE_HASH_ORDER, &cd->pctx))
 603                         goto clear_and_exit;
 604                 dx_db = &dx_dir->dx_block[blk];
 605                 if (dx_db->flags & DX_FLAG_REFERENCED) {
 606                         dx_db->flags |= DX_FLAG_DUP_REF;
 607                 } else {
 608                         dx_db->flags |= DX_FLAG_REFERENCED;
 609                         dx_db->parent = db->blockcnt;
 610                 }
 611                 if (hash < min_hash)
 612                         min_hash = hash;
 613                 if (hash > max_hash)
 614                         max_hash = hash;
 615                 dx_db->node_min_hash = hash;
 616                 if ((i+1) < count)
 617                         dx_db->node_max_hash =
 618                           ext2fs_le32_to_cpu(ent[i+1].hash) & ~1;
 619                 else {
 620                         dx_db->node_max_hash = 0xfffffffe;
 621                         dx_db->flags |= DX_FLAG_LAST;
 622                 }
 623                 if (i == 0)
 624                         dx_db->flags |= DX_FLAG_FIRST;
 625         }
 626 #ifdef DX_DEBUG
 627         printf("Blockcnt = %d, min hash 0x%08x, max hash 0x%08x\n",
 628                db->blockcnt, min_hash, max_hash);
 629 #endif
 630         dx_db = &dx_dir->dx_block[db->blockcnt];
 631         dx_db->min_hash = min_hash;
 632         dx_db->max_hash = max_hash;
 633         return;
 634
 635 clear_and_exit:
 636         clear_htree(cd->ctx, cd->pctx.ino);
 637         dx_dir->numblocks = 0;
 638 }
 639 #endif /* ENABLE_HTREE */
 640
 641 /*
 642  * Given a busted directory, try to salvage it somehow.
 643  *
 644  */
 645 static void salvage_directory(ext2_filsys fs,
 646                               struct ext2_dir_entry *dirent,
 647                               struct ext2_dir_entry *prev,
 648                               unsigned int *offset)
 649 {
 650         char    *cp = (char *) dirent;
 651         int     left, rec_len;
 652         unsigned int name_len = dirent->name_len & 0xFF;
 653
 654         rec_len = (dirent->rec_len || fs->blocksize < 65536) ?
 655                 dirent->rec_len : 65536;
 656         left = fs->blocksize - *offset - rec_len;
 657
 658         /*
 659          * Special case of directory entry of size 8: copy what's left
 660          * of the directory block up to cover up the invalid hole.
 661          */
 662         if ((left >= 12) && (rec_len == 8)) {
 663                 memmove(cp, cp+8, left);
 664                 memset(cp + left, 0, 8);
 665                 return;
 666         }
 667         /*
 668          * If the directory entry overruns the end of the directory
 669          * block, and the name is small enough to fit, then adjust the
 670          * record length.
 671          */
 672         if ((left < 0) &&
 673             (name_len + 8 <= rec_len + (unsigned) left) &&
 674             dirent->inode <= fs->super->s_inodes_count &&
 675             strnlen(dirent->name, name_len) == name_len) {
 676                 dirent->rec_len += left;
 677                 return;
 678         }
 679         /*
 680          * If the record length of the directory entry is a multiple
 681          * of four, and not too big, such that it is valid, let the
 682          * previous directory entry absorb the invalid one.
 683          */
 684         if (prev && rec_len && (rec_len % 4) == 0 &&
 685             (*offset + rec_len <= fs->blocksize)) {
 686                 prev->rec_len += rec_len;
 687                 *offset += rec_len;
 688                 return;
 689         }
 690         /*
 691          * Default salvage method --- kill all of the directory
 692          * entries for the rest of the block.  We will either try to
 693          * absorb it into the previous directory entry, or create a
 694          * new empty directory entry the rest of the directory block.
 695          */
 696         if (prev) {
 697                 prev->rec_len += fs->blocksize - *offset;
 698                 *offset = fs->blocksize;
 699         } else {
 700                 dirent->rec_len = fs->blocksize - *offset;
 701                 dirent->name_len = 0;
 702                 dirent->inode = 0;
 703         }
 704 }
 705
 706 static int check_dir_block(ext2_filsys fs,
 707                            struct ext2_db_entry *db,
 708                            void *priv_data)
 709 {
 710         struct dx_dir_info      *dx_dir;
 711 #ifdef ENABLE_HTREE
 712         struct dx_dirblock_info *dx_db = 0;
 713 #endif /* ENABLE_HTREE */
 714         struct ext2_dir_entry   *dirent, *prev;
 715         ext2_dirhash_t          hash;
 716         unsigned int            offset = 0;
 717         const char *            old_op;
 718         int                     dir_modified = 0;
 719         int                     dot_state;
 720         int                     rec_len;
 721         blk_t                   block_nr = db->blk;
 722         ext2_ino_t              ino = db->ino;
 723         ext2_ino_t              subdir_parent;
 724         __u16                   links;
 725         struct check_dir_struct *cd;
 726         char                    *buf;
 727         e2fsck_t                ctx;
 728         int                     problem;
 729         struct ext2_dx_root_info *root;
 730         struct ext2_dx_countlimit *limit;
 731         static dict_t de_dict;
 732         struct problem_context  pctx;
 733         int     dups_found = 0;
 734         int     ret;
 735
 736         cd = (struct check_dir_struct *) priv_data;
 737         buf = cd->buf;
 738         ctx = cd->ctx;
 739
 740         if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
 741                 return DIRENT_ABORT;
 742
 743         if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
 744                 return DIRENT_ABORT;
 745
 746         /*
 747          * Make sure the inode is still in use (could have been
 748          * deleted in the duplicate/bad blocks pass.
 749          */
 750         if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, ino)))
 751                 return 0;
 752
 753         cd->pctx.ino = ino;
 754         cd->pctx.blk = block_nr;
 755         cd->pctx.blkcount = db->blockcnt;
 756         cd->pctx.ino2 = 0;
 757         cd->pctx.dirent = 0;
 758         cd->pctx.num = 0;
 759
 760         if (db->blk == 0) {
 761                 if (allocate_dir_block(ctx, db, buf, &cd->pctx))
 762                         return 0;
 763                 block_nr = db->blk;
 764         }
 765
 766         if (db->blockcnt)
 767                 dot_state = 2;
 768         else
 769                 dot_state = 0;
 770
 771         if (ctx->dirs_to_hash &&
 772             ext2fs_u32_list_test(ctx->dirs_to_hash, ino))
 773                 dups_found++;
 774
 775 #if 0
 776         printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
 777                db->blockcnt, ino);
 778 #endif
 779
 780         old_op = ehandler_operation(_("reading directory block"));
 781         cd->pctx.errcode = ext2fs_read_dir_block(fs, block_nr, buf);
 782         ehandler_operation(0);
 783         if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
 784                 cd->pctx.errcode = 0; /* We'll handle this ourselves */
 785         if (cd->pctx.errcode) {
 786                 if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
 787                         ctx->flags |= E2F_FLAG_ABORT;
 788                         return DIRENT_ABORT;
 789                 }
 790                 memset(buf, 0, fs->blocksize);
 791         }
 792 #ifdef ENABLE_HTREE
 793         dx_dir = e2fsck_get_dx_dir_info(ctx, ino);
 794         if (dx_dir && dx_dir->numblocks) {
 795                 if (db->blockcnt >= dx_dir->numblocks) {
 796                         if (fix_problem(ctx, PR_2_UNEXPECTED_HTREE_BLOCK,
 797                                         &pctx)) {
 798                                 clear_htree(ctx, ino);
 799                                 dx_dir->numblocks = 0;
 800                                 dx_db = 0;
 801                                 goto out_htree;
 802                         }
 803                         fatal_error(ctx, _("Can not continue."));
 804                 }
 805                 dx_db = &dx_dir->dx_block[db->blockcnt];
 806                 dx_db->type = DX_DIRBLOCK_LEAF;
 807                 dx_db->phys = block_nr;
 808                 dx_db->min_hash = ~0;
 809                 dx_db->max_hash = 0;
 810
 811                 dirent = (struct ext2_dir_entry *) buf;
 812                 rec_len = (dirent->rec_len || fs->blocksize < 65536) ?
 813                         dirent->rec_len : 65536;
 814                 limit = (struct ext2_dx_countlimit *) (buf+8);
 815                 if (db->blockcnt == 0) {
 816                         root = (struct ext2_dx_root_info *) (buf + 24);
 817                         dx_db->type = DX_DIRBLOCK_ROOT;
 818                         dx_db->flags |= DX_FLAG_FIRST | DX_FLAG_LAST;
 819                         if ((root->reserved_zero ||
 820                              root->info_length < 8 ||
 821                              root->indirect_levels > 1) &&
 822                             fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
 823                                 clear_htree(ctx, ino);
 824                                 dx_dir->numblocks = 0;
 825                                 dx_db = 0;
 826                         }
 827                         dx_dir->hashversion = root->hash_version;
 828                         if ((dx_dir->hashversion <= EXT2_HASH_TEA) &&
 829                             (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
 830                                 dx_dir->hashversion += 3;
 831                         dx_dir->depth = root->indirect_levels + 1;
 832                 } else if ((dirent->inode == 0) &&
 833                            (rec_len == fs->blocksize) &&
 834                            (dirent->name_len == 0) &&
 835                            (ext2fs_le16_to_cpu(limit->limit) ==
 836                             ((fs->blocksize-8) /
 837                              sizeof(struct ext2_dx_entry))))
 838                         dx_db->type = DX_DIRBLOCK_NODE;
 839         }
 840 out_htree:
 841 #endif /* ENABLE_HTREE */
 842
 843         dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
 844         prev = 0;
 845         do {
 846                 int group;
 847                 ext2_ino_t first_unused_inode;
 848
 849                 problem = 0;
 850                 dirent = (struct ext2_dir_entry *) (buf + offset);
 851                 rec_len = (dirent->rec_len || fs->blocksize < 65536) ?
 852                         dirent->rec_len : 65536;
 853                 cd->pctx.dirent = dirent;
 854                 cd->pctx.num = offset;
 855                 if (((offset + rec_len) > fs->blocksize) ||
 856                     (rec_len < 12) ||
 857                     ((rec_len % 4) != 0) ||
 858                     (((dirent->name_len & 0xFF)+8) > rec_len)) {
 859                         if (fix_problem(ctx, PR_2_DIR_CORRUPTED, &cd->pctx)) {
 860                                 salvage_directory(fs, dirent, prev, &offset);
 861                                 dir_modified++;
 862                                 continue;
 863                         } else
 864                                 goto abort_free_dict;
 865                 }
 866                 if ((dirent->name_len & 0xFF) > EXT2_NAME_LEN) {
 867                         if (fix_problem(ctx, PR_2_FILENAME_LONG, &cd->pctx)) {
 868                                 dirent->name_len = EXT2_NAME_LEN;
 869                                 dir_modified++;
 870                         }
 871                 }
 872
 873                 if (dot_state == 0) {
 874                         if (check_dot(ctx, dirent, ino, &cd->pctx))
 875                                 dir_modified++;
 876                 } else if (dot_state == 1) {
 877                         ret = check_dotdot(ctx, dirent, ino, &cd->pctx);
 878                         if (ret < 0)
 879                                 goto abort_free_dict;
 880                         if (ret)
 881                                 dir_modified++;
 882                 } else if (dirent->inode == ino) {
 883                         problem = PR_2_LINK_DOT;
 884                         if (fix_problem(ctx, PR_2_LINK_DOT, &cd->pctx)) {
 885                                 dirent->inode = 0;
 886                                 dir_modified++;
 887                                 goto next;
 888                         }
 889                 }
 890                 if (!dirent->inode)
 891                         goto next;
 892
 893                 /*
 894                  * Make sure the inode listed is a legal one.
 895                  */
 896                 if (((dirent->inode != EXT2_ROOT_INO) &&
 897                      (dirent->inode < EXT2_FIRST_INODE(fs->super))) ||
 898                     (dirent->inode > fs->super->s_inodes_count)) {
 899                         problem = PR_2_BAD_INO;
 900                 } else if (ctx->inode_bb_map &&
 901                            (ext2fs_test_inode_bitmap(ctx->inode_bb_map,
 902                                                      dirent->inode))) {
 903                         /*
 904                          * If the inode is in a bad block, offer to
 905                          * clear it.
 906                          */
 907                         problem = PR_2_BB_INODE;
 908                 } else if ((dot_state > 1) &&
 909                            ((dirent->name_len & 0xFF) == 1) &&
 910                            (dirent->name[0] == '.')) {
 911                         /*
 912                          * If there's a '.' entry in anything other
 913                          * than the first directory entry, it's a
 914                          * duplicate entry that should be removed.
 915                          */
 916                         problem = PR_2_DUP_DOT;
 917                 } else if ((dot_state > 1) &&
 918                            ((dirent->name_len & 0xFF) == 2) &&
 919                            (dirent->name[0] == '.') &&
 920                            (dirent->name[1] == '.')) {
 921                         /*
 922                          * If there's a '..' entry in anything other
 923                          * than the second directory entry, it's a
 924                          * duplicate entry that should be removed.
 925                          */
 926                         problem = PR_2_DUP_DOT_DOT;
 927                 } else if ((dot_state > 1) &&
 928                            (dirent->inode == EXT2_ROOT_INO)) {
 929                         /*
 930                          * Don't allow links to the root directory.
 931                          * We check this specially to make sure we
 932                          * catch this error case even if the root
 933                          * directory hasn't been created yet.
 934                          */
 935                         problem = PR_2_LINK_ROOT;
 936                 } else if ((dot_state > 1) &&
 937                            (dirent->name_len & 0xFF) == 0) {
 938                         /*
 939                          * Don't allow zero-length directory names.
 940                          */
 941                         problem = PR_2_NULL_NAME;
 942                 }
 943
 944                 if (problem) {
 945                         if (fix_problem(ctx, problem, &cd->pctx)) {
 946                                 dirent->inode = 0;
 947                                 dir_modified++;
 948                                 goto next;
 949                         } else {
 950                                 ext2fs_unmark_valid(fs);
 951                                 if (problem == PR_2_BAD_INO)
 952                                         goto next;
 953                         }
 954                 }
 955
 956                 /*
 957                  * If the inode was marked as having bad fields in
 958                  * pass1, process it and offer to fix/clear it.
 959                  * (We wait until now so that we can display the
 960                  * pathname to the user.)
 961                  */
 962                 if (ctx->inode_bad_map &&
 963                     ext2fs_test_inode_bitmap(ctx->inode_bad_map,
 964                                              dirent->inode)) {
 965                         if (e2fsck_process_bad_inode(ctx, ino,
 966                                                      dirent->inode,
 967                                                      buf + fs->blocksize)) {
 968                                 dirent->inode = 0;
 969                                 dir_modified++;
 970                                 goto next;
 971                         }
 972                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 973                                 return DIRENT_ABORT;
 974                 }
 975
 976                 group = ext2fs_group_of_ino(fs, dirent->inode);
 977                 first_unused_inode = group * fs->super->s_inodes_per_group +
 978                                         1 + fs->super->s_inodes_per_group -
 979                                         fs->group_desc[group].bg_itable_unused;
 980                 cd->pctx.group = group;
 981
 982                 /*
 983                  * Check if the inode was missed out because _INODE_UNINIT
 984                  * flag was set or bg_itable_unused was incorrect.
 985                  * If that is the case restart e2fsck.
 986                  * XXX Optimisations TODO:
 987                  * 1. only restart e2fsck once
 988                  * 2. only exposed inodes are checked again.
 989                  */
 990                 if (fs->group_desc[group].bg_flags & EXT2_BG_INODE_UNINIT) {
 991                         if (fix_problem(ctx, PR_2_INOREF_BG_INO_UNINIT,
 992                                         &cd->pctx)){
 993                                 fs->group_desc[group].bg_flags &=
 994                                         ~EXT2_BG_INODE_UNINIT;
 995                                 ctx->flags |= E2F_FLAG_RESTART |
 996                                         E2F_FLAG_SIGNAL_MASK;
 997                         } else {
 998                                 ext2fs_unmark_valid(fs);
 999                                 if (problem == PR_2_BAD_INO)
1000                                         goto next;
1001                         }
1002                 } else if (dirent->inode >= first_unused_inode) {
1003                         if (fix_problem(ctx, PR_2_INOREF_IN_UNUSED, &cd->pctx)){
1004                                 fs->group_desc[group].bg_itable_unused = 0;
1005                                 fs->group_desc[group].bg_flags &=
1006                                         ~EXT2_BG_INODE_UNINIT;
1007                                 ext2fs_mark_super_dirty(fs);
1008                                 ctx->flags |= E2F_FLAG_RESTART;
1009                                 goto restart_fsck;
1010                         } else {
1011                                 ext2fs_unmark_valid(fs);
1012                                 if (problem == PR_2_BAD_INO)
1013                                         goto next;
1014                         }
1015                 }
1016
1017                 if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map,
1018                                                dirent->inode))) {
1019                         /*
1020                          * If the inode is unused, offer to clear it.
1021                          */
1022                         problem = PR_2_UNUSED_INODE;
1023                 }
1024
1025                 if (problem) {
1026                         if (fix_problem(ctx, problem, &cd->pctx)) {
1027                                 dirent->inode = 0;
1028                                 dir_modified++;
1029                                 goto next;
1030                         } else {
1031                                 ext2fs_unmark_valid(fs);
1032                                 if (problem == PR_2_BAD_INO)
1033                                         goto next;
1034                         }
1035                 }
1036
1037                 if (check_name(ctx, dirent, ino, &cd->pctx))
1038                         dir_modified++;
1039
1040                 if (check_filetype(ctx, dirent, ino, &cd->pctx))
1041                         dir_modified++;
1042
1043 #ifdef ENABLE_HTREE
1044                 if (dx_db) {
1045                         ext2fs_dirhash(dx_dir->hashversion, dirent->name,
1046                                        (dirent->name_len & 0xFF),
1047                                        fs->super->s_hash_seed, &hash, 0);
1048                         if (hash < dx_db->min_hash)
1049                                 dx_db->min_hash = hash;
1050                         if (hash > dx_db->max_hash)
1051                                 dx_db->max_hash = hash;
1052                 }
1053 #endif
1054
1055                 /*
1056                  * If this is a directory, then mark its parent in its
1057                  * dir_info structure.  If the parent field is already
1058                  * filled in, then this directory has more than one
1059                  * hard link.  We assume the first link is correct,
1060                  * and ask the user if he/she wants to clear this one.
1061                  */
1062                 if ((dot_state > 1) &&
1063                     (ext2fs_test_inode_bitmap(ctx->inode_dir_map,
1064                                               dirent->inode))) {
1065                         if (e2fsck_dir_info_get_parent(ctx, dirent->inode,
1066                                                        &subdir_parent)) {
1067                                 cd->pctx.ino = dirent->inode;
1068                                 fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
1069                                 goto abort_free_dict;
1070                         }
1071                         if (subdir_parent) {
1072                                 cd->pctx.ino2 = subdir_parent;
1073                                 if (fix_problem(ctx, PR_2_LINK_DIR,
1074                                                 &cd->pctx)) {
1075                                         dirent->inode = 0;
1076                                         dir_modified++;
1077                                         goto next;
1078                                 }
1079                                 cd->pctx.ino2 = 0;
1080                         } else {
1081                                 (void) e2fsck_dir_info_set_parent(ctx,
1082                                                   dirent->inode, ino);
1083                         }
1084                 }
1085
1086                 if (dups_found) {
1087                         ;
1088                 } else if (dict_lookup(&de_dict, dirent)) {
1089                         clear_problem_context(&pctx);
1090                         pctx.ino = ino;
1091                         pctx.dirent = dirent;
1092                         fix_problem(ctx, PR_2_REPORT_DUP_DIRENT, &pctx);
1093                         if (!ctx->dirs_to_hash)
1094                                 ext2fs_u32_list_create(&ctx->dirs_to_hash, 50);
1095                         if (ctx->dirs_to_hash)
1096                                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1097                         dups_found++;
1098                 } else
1099                         dict_alloc_insert(&de_dict, dirent, dirent);
1100
1101                 ext2fs_icount_increment(ctx->inode_count, dirent->inode,
1102                                         &links);
1103                 if (links > 1)
1104                         ctx->fs_links_count++;
1105                 ctx->fs_total_count++;
1106         next:
1107                 prev = dirent;
1108                 if (dir_modified)
1109                         rec_len = (dirent->rec_len || fs->blocksize < 65536) ?
1110                                 dirent->rec_len : 65536;
1111                 offset += rec_len;
1112                 dot_state++;
1113         } while (offset < fs->blocksize);
1114 #if 0
1115         printf("\n");
1116 #endif
1117 #ifdef ENABLE_HTREE
1118         if (dx_db) {
1119 #ifdef DX_DEBUG
1120                 printf("db_block %d, type %d, min_hash 0x%0x, max_hash 0x%0x\n",
1121                        db->blockcnt, dx_db->type,
1122                        dx_db->min_hash, dx_db->max_hash);
1123 #endif
1124                 cd->pctx.dir = cd->pctx.ino;
1125                 if ((dx_db->type == DX_DIRBLOCK_ROOT) ||
1126                     (dx_db->type == DX_DIRBLOCK_NODE))
1127                         parse_int_node(fs, db, cd, dx_dir, buf);
1128         }
1129 #endif /* ENABLE_HTREE */
1130         if (offset != fs->blocksize) {
1131                 cd->pctx.num = rec_len - fs->blocksize + offset;
1132                 if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
1133                         dirent->rec_len = cd->pctx.num;
1134                         dir_modified++;
1135                 }
1136         }
1137         if (dir_modified) {
1138                 cd->pctx.errcode = ext2fs_write_dir_block(fs, block_nr, buf);
1139                 if (cd->pctx.errcode) {
1140                         if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
1141                                          &cd->pctx))
1142                                 goto abort_free_dict;
1143                 }
1144                 ext2fs_mark_changed(fs);
1145         }
1146         dict_free_nodes(&de_dict);
1147         return 0;
1148 abort_free_dict:
1149         ctx->flags |= E2F_FLAG_ABORT;
1150 restart_fsck:
1151         dict_free_nodes(&de_dict);
1152         return DIRENT_ABORT;
1153 }
1154
1155 /*
1156  * This function is called to deallocate a block, and is an interator
1157  * functioned called by deallocate inode via ext2fs_iterate_block().
1158  */
1159 static int deallocate_inode_block(ext2_filsys fs,
1160                                   blk_t *block_nr,
1161                                   e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
1162                                   blk_t ref_block EXT2FS_ATTR((unused)),
1163                                   int ref_offset EXT2FS_ATTR((unused)),
1164                                   void *priv_data)
1165 {
1166         e2fsck_t        ctx = (e2fsck_t) priv_data;
1167
1168         if (HOLE_BLKADDR(*block_nr))
1169                 return 0;
1170         if ((*block_nr < fs->super->s_first_data_block) ||
1171             (*block_nr >= fs->super->s_blocks_count))
1172                 return 0;
1173         ext2fs_unmark_block_bitmap(ctx->block_found_map, *block_nr);
1174         ext2fs_block_alloc_stats(fs, *block_nr, -1);
1175         return 0;
1176 }
1177
1178 /*
1179  * This fuction deallocates an inode
1180  */
1181 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
1182 {
1183         ext2_filsys fs = ctx->fs;
1184         struct ext2_inode       inode;
1185         struct problem_context  pctx;
1186         __u32                   count;
1187
1188         e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
1189         e2fsck_clear_inode(ctx, ino, &inode, 0, "deallocate_inode");
1190         clear_problem_context(&pctx);
1191         pctx.ino = ino;
1192
1193         /*
1194          * Fix up the bitmaps...
1195          */
1196         e2fsck_read_bitmaps(ctx);
1197         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode));
1198
1199         if (inode.i_file_acl &&
1200             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1201                 pctx.errcode = ext2fs_adjust_ea_refcount(fs, inode.i_file_acl,
1202                                                    block_buf, -1, &count);
1203                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
1204                         pctx.errcode = 0;
1205                         count = 1;
1206                 }
1207                 if (pctx.errcode) {
1208                         pctx.blk = inode.i_file_acl;
1209                         fix_problem(ctx, PR_2_ADJ_EA_REFCOUNT, &pctx);
1210                         ctx->flags |= E2F_FLAG_ABORT;
1211                         return;
1212                 }
1213                 if (count == 0) {
1214                         ext2fs_unmark_block_bitmap(ctx->block_found_map,
1215                                                    inode.i_file_acl);
1216                         ext2fs_block_alloc_stats(fs, inode.i_file_acl, -1);
1217                 }
1218                 inode.i_file_acl = 0;
1219         }
1220
1221         if (!ext2fs_inode_has_valid_blocks(&inode))
1222                 return;
1223
1224         if (LINUX_S_ISREG(inode.i_mode) &&
1225             (inode.i_size_high || inode.i_size & 0x80000000UL))
1226                 ctx->large_files--;
1227
1228         pctx.errcode = ext2fs_block_iterate2(fs, ino, 0, block_buf,
1229                                             deallocate_inode_block, ctx);
1230         if (pctx.errcode) {
1231                 fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
1232                 ctx->flags |= E2F_FLAG_ABORT;
1233                 return;
1234         }
1235 }
1236
1237 /*
1238  * This fuction clears the htree flag on an inode
1239  */
1240 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino)
1241 {
1242         struct ext2_inode       inode;
1243
1244         e2fsck_read_inode(ctx, ino, &inode, "clear_htree");
1245         inode.i_flags = inode.i_flags & ~EXT2_INDEX_FL;
1246         e2fsck_write_inode(ctx, ino, &inode, "clear_htree");
1247         if (ctx->dirs_to_hash)
1248                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1249 }
1250
1251
1252 extern int e2fsck_process_bad_inode(e2fsck_t ctx, ext2_ino_t dir,
1253                                     ext2_ino_t ino, char *buf)
1254 {
1255         ext2_filsys fs = ctx->fs;
1256         struct ext2_inode       inode;
1257         int                     inode_modified = 0;
1258         int                     not_fixed = 0;
1259         unsigned char           *frag, *fsize;
1260         struct problem_context  pctx;
1261         int     problem = 0;
1262
1263         e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");
1264
1265         clear_problem_context(&pctx);
1266         pctx.ino = ino;
1267         pctx.dir = dir;
1268         pctx.inode = &inode;
1269
1270         if (inode.i_file_acl &&
1271             !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1272                 if (fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
1273                         inode.i_file_acl = 0;
1274                         inode_modified++;
1275                 } else
1276                         not_fixed++;
1277         }
1278
1279         if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) &&
1280             !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) &&
1281             !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) &&
1282             !(LINUX_S_ISSOCK(inode.i_mode)))
1283                 problem = PR_2_BAD_MODE;
1284         else if (LINUX_S_ISCHR(inode.i_mode)
1285                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1286                 problem = PR_2_BAD_CHAR_DEV;
1287         else if (LINUX_S_ISBLK(inode.i_mode)
1288                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1289                 problem = PR_2_BAD_BLOCK_DEV;
1290         else if (LINUX_S_ISFIFO(inode.i_mode)
1291                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1292                 problem = PR_2_BAD_FIFO;
1293         else if (LINUX_S_ISSOCK(inode.i_mode)
1294                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1295                 problem = PR_2_BAD_SOCKET;
1296         else if (LINUX_S_ISLNK(inode.i_mode)
1297                  && !e2fsck_pass1_check_symlink(fs, ino, &inode, buf)) {
1298                 problem = PR_2_INVALID_SYMLINK;
1299         }
1300
1301         if (problem) {
1302                 if (fix_problem(ctx, problem, &pctx)) {
1303                         deallocate_inode(ctx, ino, 0);
1304                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
1305                                 return 0;
1306                         return 1;
1307                 } else
1308                         not_fixed++;
1309                 problem = 0;
1310         }
1311
1312         if (inode.i_faddr) {
1313                 if (fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
1314                         inode.i_faddr = 0;
1315                         inode_modified++;
1316                 } else
1317                         not_fixed++;
1318         }
1319
1320         switch (fs->super->s_creator_os) {
1321             case EXT2_OS_HURD:
1322                 frag = &inode.osd2.hurd2.h_i_frag;
1323                 fsize = &inode.osd2.hurd2.h_i_fsize;
1324                 break;
1325             default:
1326                 frag = fsize = 0;
1327         }
1328         if (frag && *frag) {
1329                 pctx.num = *frag;
1330                 if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
1331                         *frag = 0;
1332                         inode_modified++;
1333                 } else
1334                         not_fixed++;
1335                 pctx.num = 0;
1336         }
1337         if (fsize && *fsize) {
1338                 pctx.num = *fsize;
1339                 if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
1340                         *fsize = 0;
1341                         inode_modified++;
1342                 } else
1343                         not_fixed++;
1344                 pctx.num = 0;
1345         }
1346
1347         if ((fs->super->s_creator_os == EXT2_OS_LINUX) &&
1348             !(fs->super->s_feature_ro_compat &
1349               EXT4_FEATURE_RO_COMPAT_HUGE_FILE) &&
1350             (inode.osd2.linux2.l_i_blocks_hi != 0)) {
1351                 pctx.num = inode.osd2.linux2.l_i_blocks_hi;
1352                 if (fix_problem(ctx, PR_2_BLOCKS_HI_ZERO, &pctx)) {
1353                         inode.osd2.linux2.l_i_blocks_hi = 0;
1354                         inode_modified++;
1355                 }
1356         }
1357
1358         if (inode.i_file_acl &&
1359             ((inode.i_file_acl < fs->super->s_first_data_block) ||
1360              (inode.i_file_acl >= fs->super->s_blocks_count))) {
1361                 if (fix_problem(ctx, PR_2_FILE_ACL_BAD, &pctx)) {
1362                         inode.i_file_acl = 0;
1363                         inode_modified++;
1364                 } else
1365                         not_fixed++;
1366         }
1367         if (inode.i_dir_acl &&
1368             LINUX_S_ISDIR(inode.i_mode)) {
1369                 if (fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
1370                         inode.i_dir_acl = 0;
1371                         inode_modified++;
1372                 } else
1373                         not_fixed++;
1374         }
1375
1376         if (inode_modified)
1377                 e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
1378         if (!not_fixed && ctx->inode_bad_map)
1379                 ext2fs_unmark_inode_bitmap(ctx->inode_bad_map, ino);
1380         return 0;
1381 }
1382
1383
1384 /*
1385  * allocate_dir_block --- this function allocates a new directory
1386  *      block for a particular inode; this is done if a directory has
1387  *      a "hole" in it, or if a directory has a illegal block number
1388  *      that was zeroed out and now needs to be replaced.
1389  */
1390 static int allocate_dir_block(e2fsck_t ctx,
1391                               struct ext2_db_entry *db,
1392                               char *buf EXT2FS_ATTR((unused)),
1393                               struct problem_context *pctx)
1394 {
1395         ext2_filsys fs = ctx->fs;
1396         blk_t                   blk;
1397         char                    *block;
1398         struct ext2_inode       inode;
1399
1400         if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
1401                 return 1;
1402
1403         /*
1404          * Read the inode and block bitmaps in; we'll be messing with
1405          * them.
1406          */
1407         e2fsck_read_bitmaps(ctx);
1408
1409         /*
1410          * First, find a free block
1411          */
1412         pctx->errcode = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk);
1413         if (pctx->errcode) {
1414                 pctx->str = "ext2fs_new_block";
1415                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1416                 return 1;
1417         }
1418         ext2fs_mark_block_bitmap(ctx->block_found_map, blk);
1419         ext2fs_mark_block_bitmap(fs->block_map, blk);
1420         ext2fs_mark_bb_dirty(fs);
1421
1422         /*
1423          * Now let's create the actual data block for the inode
1424          */
1425         if (db->blockcnt)
1426                 pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
1427         else
1428                 pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
1429                                                      EXT2_ROOT_INO, &block);
1430
1431         if (pctx->errcode) {
1432                 pctx->str = "ext2fs_new_dir_block";
1433                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1434                 return 1;
1435         }
1436
1437         pctx->errcode = ext2fs_write_dir_block(fs, blk, block);
1438         ext2fs_free_mem(&block);
1439         if (pctx->errcode) {
1440                 pctx->str = "ext2fs_write_dir_block";
1441                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1442                 return 1;
1443         }
1444
1445         /*
1446          * Update the inode block count
1447          */
1448         e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
1449         ext2fs_iblk_add_blocks(fs, &inode, 1);
1450         if (inode.i_size < (db->blockcnt+1) * fs->blocksize)
1451                 inode.i_size = (db->blockcnt+1) * fs->blocksize;
1452         e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");
1453
1454         /*
1455          * Finally, update the block pointers for the inode
1456          */
1457         db->blk = blk;
1458         pctx->errcode = ext2fs_block_iterate2(fs, db->ino, BLOCK_FLAG_HOLE,
1459                                       0, update_dir_block, db);
1460         if (pctx->errcode) {
1461                 pctx->str = "ext2fs_block_iterate";
1462                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1463                 return 1;
1464         }
1465
1466         return 0;
1467 }
1468
1469 /*
1470  * This is a helper function for allocate_dir_block().
1471  */
1472 static int update_dir_block(ext2_filsys fs EXT2FS_ATTR((unused)),
1473                             blk_t       *block_nr,
1474                             e2_blkcnt_t blockcnt,
1475                             blk_t ref_block EXT2FS_ATTR((unused)),
1476                             int ref_offset EXT2FS_ATTR((unused)),
1477                             void *priv_data)
1478 {
1479         struct ext2_db_entry *db;
1480
1481         db = (struct ext2_db_entry *) priv_data;
1482         if (db->blockcnt == (int) blockcnt) {
1483                 *block_nr = db->blk;
1484                 return BLOCK_CHANGED;
1485         }
1486         return 0;
1487 }