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         init_resource_track(&rtrack, ctx->fs->io);
 105         clear_problem_context(&cd.pctx);
 106
 107 #ifdef MTRACE
 108         mtrace_print("Pass 2");
 109 #endif
 110
 111         if (!(ctx->options & E2F_OPT_PREEN))
 112                 fix_problem(ctx, PR_2_PASS_HEADER, &cd.pctx);
 113
 114         e2fsck_setup_tdb_icount(ctx, EXT2_ICOUNT_OPT_INCREMENT,
 115                                 &ctx->inode_count);
 116         if (ctx->inode_count)
 117                 cd.pctx.errcode = 0;
 118         else
 119                 cd.pctx.errcode = ext2fs_create_icount2(fs,
 120                                                 EXT2_ICOUNT_OPT_INCREMENT,
 121                                                 0, ctx->inode_link_info,
 122                                                 &ctx->inode_count);
 123         if (cd.pctx.errcode) {
 124                 fix_problem(ctx, PR_2_ALLOCATE_ICOUNT, &cd.pctx);
 125                 ctx->flags |= E2F_FLAG_ABORT;
 126                 return;
 127         }
 128         buf = (char *) e2fsck_allocate_memory(ctx, 2*fs->blocksize,
 129                                               "directory scan buffer");
 130
 131         /*
 132          * Set up the parent pointer for the root directory, if
 133          * present.  (If the root directory is not present, we will
 134          * create it in pass 3.)
 135          */
 136         (void) e2fsck_dir_info_set_parent(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO);
 137
 138         cd.buf = buf;
 139         cd.ctx = ctx;
 140         cd.count = 1;
 141         cd.max = ext2fs_dblist_count(fs->dblist);
 142
 143         if (ctx->progress)
 144                 (void) (ctx->progress)(ctx, 2, 0, cd.max);
 145
 146         if (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX)
 147                 ext2fs_dblist_sort(fs->dblist, special_dir_block_cmp);
 148
 149         cd.pctx.errcode = ext2fs_dblist_iterate(fs->dblist, check_dir_block,
 150                                                 &cd);
 151         if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
 152                 return;
 153
 154         if (ctx->flags & E2F_FLAG_RESTART_LATER) {
 155                 ctx->flags |= E2F_FLAG_RESTART;
 156                 return;
 157         }
 158
 159         if (cd.pctx.errcode) {
 160                 fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
 161                 ctx->flags |= E2F_FLAG_ABORT;
 162                 return;
 163         }
 164
 165 #ifdef ENABLE_HTREE
 166         for (i=0; (dx_dir = e2fsck_dx_dir_info_iter(ctx, &i)) != 0;) {
 167                 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 168                         return;
 169                 if (dx_dir->numblocks == 0)
 170                         continue;
 171                 clear_problem_context(&pctx);
 172                 bad_dir = 0;
 173                 pctx.dir = dx_dir->ino;
 174                 dx_db = dx_dir->dx_block;
 175                 if (dx_db->flags & DX_FLAG_REFERENCED)
 176                         dx_db->flags |= DX_FLAG_DUP_REF;
 177                 else
 178                         dx_db->flags |= DX_FLAG_REFERENCED;
 179                 /*
 180                  * Find all of the first and last leaf blocks, and
 181                  * update their parent's min and max hash values
 182                  */
 183                 for (b=0, dx_db = dx_dir->dx_block;
 184                      b < dx_dir->numblocks;
 185                      b++, dx_db++) {
 186                         if ((dx_db->type != DX_DIRBLOCK_LEAF) ||
 187                             !(dx_db->flags & (DX_FLAG_FIRST | DX_FLAG_LAST)))
 188                                 continue;
 189                         dx_parent = &dx_dir->dx_block[dx_db->parent];
 190                         /*
 191                          * XXX Make sure dx_parent->min_hash > dx_db->min_hash
 192                          */
 193                         if (dx_db->flags & DX_FLAG_FIRST)
 194                                 dx_parent->min_hash = dx_db->min_hash;
 195                         /*
 196                          * XXX Make sure dx_parent->max_hash < dx_db->max_hash
 197                          */
 198                         if (dx_db->flags & DX_FLAG_LAST)
 199                                 dx_parent->max_hash = dx_db->max_hash;
 200                 }
 201
 202                 for (b=0, dx_db = dx_dir->dx_block;
 203                      b < dx_dir->numblocks;
 204                      b++, dx_db++) {
 205                         pctx.blkcount = b;
 206                         pctx.group = dx_db->parent;
 207                         code = 0;
 208                         if (!(dx_db->flags & DX_FLAG_FIRST) &&
 209                             (dx_db->min_hash < dx_db->node_min_hash)) {
 210                                 pctx.blk = dx_db->min_hash;
 211                                 pctx.blk2 = dx_db->node_min_hash;
 212                                 code = PR_2_HTREE_MIN_HASH;
 213                                 fix_problem(ctx, code, &pctx);
 214                                 bad_dir++;
 215                         }
 216                         if (dx_db->type == DX_DIRBLOCK_LEAF) {
 217                                 depth = htree_depth(dx_dir, dx_db);
 218                                 if (depth != dx_dir->depth) {
 219                                         pctx.num = dx_dir->depth;
 220                                         code = PR_2_HTREE_BAD_DEPTH;
 221                                         fix_problem(ctx, code, &pctx);
 222                                         bad_dir++;
 223                                 }
 224                         }
 225                         /*
 226                          * This test doesn't apply for the root block
 227                          * at block #0
 228                          */
 229                         if (b &&
 230                             (dx_db->max_hash > dx_db->node_max_hash)) {
 231                                 pctx.blk = dx_db->max_hash;
 232                                 pctx.blk2 = dx_db->node_max_hash;
 233                                 code = PR_2_HTREE_MAX_HASH;
 234                                 fix_problem(ctx, code, &pctx);
 235                                 bad_dir++;
 236                         }
 237                         if (!(dx_db->flags & DX_FLAG_REFERENCED)) {
 238                                 code = PR_2_HTREE_NOTREF;
 239                                 fix_problem(ctx, code, &pctx);
 240                                 bad_dir++;
 241                         } else if (dx_db->flags & DX_FLAG_DUP_REF) {
 242                                 code = PR_2_HTREE_DUPREF;
 243                                 fix_problem(ctx, code, &pctx);
 244                                 bad_dir++;
 245                         }
 246                 }
 247                 if (bad_dir && fix_problem(ctx, PR_2_HTREE_CLEAR, &pctx)) {
 248                         clear_htree(ctx, dx_dir->ino);
 249                         dx_dir->numblocks = 0;
 250                 }
 251         }
 252         e2fsck_free_dx_dir_info(ctx);
 253 #endif
 254         ext2fs_free_mem(&buf);
 255         ext2fs_free_dblist(fs->dblist);
 256
 257         if (ctx->inode_bad_map) {
 258                 ext2fs_free_inode_bitmap(ctx->inode_bad_map);
 259                 ctx->inode_bad_map = 0;
 260         }
 261         if (ctx->inode_reg_map) {
 262                 ext2fs_free_inode_bitmap(ctx->inode_reg_map);
 263                 ctx->inode_reg_map = 0;
 264         }
 265
 266         clear_problem_context(&pctx);
 267         if (ctx->large_files) {
 268                 if (!(sb->s_feature_ro_compat &
 269                       EXT2_FEATURE_RO_COMPAT_LARGE_FILE) &&
 270                     fix_problem(ctx, PR_2_FEATURE_LARGE_FILES, &pctx)) {
 271                         sb->s_feature_ro_compat |=
 272                                 EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
 273                         fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 274                         ext2fs_mark_super_dirty(fs);
 275                 }
 276                 if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 277                     fix_problem(ctx, PR_1_FS_REV_LEVEL, &pctx)) {
 278                         ext2fs_update_dynamic_rev(fs);
 279                         ext2fs_mark_super_dirty(fs);
 280                 }
 281         }
 282
 283         print_resource_track(ctx, _("Pass 2"), &rtrack, fs->io);
 284 }
 285
 286 #define MAX_DEPTH 32000
 287 static int htree_depth(struct dx_dir_info *dx_dir,
 288                        struct dx_dirblock_info *dx_db)
 289 {
 290         int     depth = 0;
 291
 292         while (dx_db->type != DX_DIRBLOCK_ROOT && depth < MAX_DEPTH) {
 293                 dx_db = &dx_dir->dx_block[dx_db->parent];
 294                 depth++;
 295         }
 296         return depth;
 297 }
 298
 299 static int dict_de_cmp(const void *a, const void *b)
 300 {
 301         const struct ext2_dir_entry *de_a, *de_b;
 302         int     a_len, b_len;
 303
 304         de_a = (const struct ext2_dir_entry *) a;
 305         a_len = de_a->name_len & 0xFF;
 306         de_b = (const struct ext2_dir_entry *) b;
 307         b_len = de_b->name_len & 0xFF;
 308
 309         if (a_len != b_len)
 310                 return (a_len - b_len);
 311
 312         return strncmp(de_a->name, de_b->name, a_len);
 313 }
 314
 315 /*
 316  * This is special sort function that makes sure that directory blocks
 317  * with a dirblock of zero are sorted to the beginning of the list.
 318  * This guarantees that the root node of the htree directories are
 319  * processed first, so we know what hash version to use.
 320  */
 321 static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b)
 322 {
 323         const struct ext2_db_entry *db_a =
 324                 (const struct ext2_db_entry *) a;
 325         const struct ext2_db_entry *db_b =
 326                 (const struct ext2_db_entry *) b;
 327
 328         if (db_a->blockcnt && !db_b->blockcnt)
 329                 return 1;
 330
 331         if (!db_a->blockcnt && db_b->blockcnt)
 332                 return -1;
 333
 334         if (db_a->blk != db_b->blk)
 335                 return (int) (db_a->blk - db_b->blk);
 336
 337         if (db_a->ino != db_b->ino)
 338                 return (int) (db_a->ino - db_b->ino);
 339
 340         return (int) (db_a->blockcnt - db_b->blockcnt);
 341 }
 342
 343
 344 /*
 345  * Make sure the first entry in the directory is '.', and that the
 346  * directory entry is sane.
 347  */
 348 static int check_dot(e2fsck_t ctx,
 349                      struct ext2_dir_entry *dirent,
 350                      ext2_ino_t ino, struct problem_context *pctx)
 351 {
 352         struct ext2_dir_entry *nextdir;
 353         unsigned int    rec_len, new_len;
 354         int     status = 0;
 355         int     created = 0;
 356         int     problem = 0;
 357
 358         if (!dirent->inode)
 359                 problem = PR_2_MISSING_DOT;
 360         else if (((dirent->name_len & 0xFF) != 1) ||
 361                  (dirent->name[0] != '.'))
 362                 problem = PR_2_1ST_NOT_DOT;
 363         else if (dirent->name[1] != '\0')
 364                 problem = PR_2_DOT_NULL_TERM;
 365
 366         (void) ext2fs_get_rec_len(ctx->fs, dirent, &rec_len);
 367         if (problem) {
 368                 if (fix_problem(ctx, problem, pctx)) {
 369                         if (rec_len < 12)
 370                                 rec_len = dirent->rec_len = 12;
 371                         dirent->inode = ino;
 372                         dirent->name_len = 1;
 373                         dirent->name[0] = '.';
 374                         dirent->name[1] = '\0';
 375                         status = 1;
 376                         created = 1;
 377                 }
 378         }
 379         if (dirent->inode != ino) {
 380                 if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
 381                         dirent->inode = ino;
 382                         status = 1;
 383                 }
 384         }
 385         if (rec_len > 12) {
 386                 new_len = rec_len - 12;
 387                 if (new_len > 12) {
 388                         if (created ||
 389                             fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
 390                                 nextdir = (struct ext2_dir_entry *)
 391                                         ((char *) dirent + 12);
 392                                 dirent->rec_len = 12;
 393                                 (void) ext2fs_set_rec_len(ctx->fs, new_len,
 394                                                           nextdir);
 395                                 nextdir->inode = 0;
 396                                 nextdir->name_len = 0;
 397                                 status = 1;
 398                         }
 399                 }
 400         }
 401         return status;
 402 }
 403
 404 /*
 405  * Make sure the second entry in the directory is '..', and that the
 406  * directory entry is sane.  We do not check the inode number of '..'
 407  * here; this gets done in pass 3.
 408  */
 409 static int check_dotdot(e2fsck_t ctx,
 410                         struct ext2_dir_entry *dirent,
 411                         ext2_ino_t ino, struct problem_context *pctx)
 412 {
 413         int     rec_len, problem = 0;
 414
 415         if (!dirent->inode)
 416                 problem = PR_2_MISSING_DOT_DOT;
 417         else if (((dirent->name_len & 0xFF) != 2) ||
 418                  (dirent->name[0] != '.') ||
 419                  (dirent->name[1] != '.'))
 420                 problem = PR_2_2ND_NOT_DOT_DOT;
 421         else if (dirent->name[2] != '\0')
 422                 problem = PR_2_DOT_DOT_NULL_TERM;
 423
 424         (void) ext2fs_get_rec_len(ctx->fs, dirent, &rec_len);
 425         if (problem) {
 426                 if (fix_problem(ctx, problem, pctx)) {
 427                         if (rec_len < 12)
 428                                 dirent->rec_len = 12;
 429                         /*
 430                          * Note: we don't have the parent inode just
 431                          * yet, so we will fill it in with the root
 432                          * inode.  This will get fixed in pass 3.
 433                          */
 434                         dirent->inode = EXT2_ROOT_INO;
 435                         dirent->name_len = 2;
 436                         dirent->name[0] = '.';
 437                         dirent->name[1] = '.';
 438                         dirent->name[2] = '\0';
 439                         return 1;
 440                 }
 441                 return 0;
 442         }
 443         if (e2fsck_dir_info_set_dotdot(ctx, ino, dirent->inode)) {
 444                 fix_problem(ctx, PR_2_NO_DIRINFO, pctx);
 445                 return -1;
 446         }
 447         return 0;
 448 }
 449
 450 /*
 451  * Check to make sure a directory entry doesn't contain any illegal
 452  * characters.
 453  */
 454 static int check_name(e2fsck_t ctx,
 455                       struct ext2_dir_entry *dirent,
 456                       ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 457                       struct problem_context *pctx)
 458 {
 459         int     i;
 460         int     fixup = -1;
 461         int     ret = 0;
 462
 463         for ( i = 0; i < (dirent->name_len & 0xFF); i++) {
 464                 if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
 465                         if (fixup < 0) {
 466                                 fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
 467                         }
 468                         if (fixup) {
 469                                 dirent->name[i] = '.';
 470                                 ret = 1;
 471                         }
 472                 }
 473         }
 474         return ret;
 475 }
 476
 477 /*
 478  * Check the directory filetype (if present)
 479  */
 480 static _INLINE_ int check_filetype(e2fsck_t ctx,
 481                                    struct ext2_dir_entry *dirent,
 482                                    ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 483                                    struct problem_context *pctx)
 484 {
 485         int     filetype = dirent->name_len >> 8;
 486         int     should_be = EXT2_FT_UNKNOWN;
 487         struct ext2_inode       inode;
 488
 489         if (!(ctx->fs->super->s_feature_incompat &
 490               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 491                 if (filetype == 0 ||
 492                     !fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
 493                         return 0;
 494                 dirent->name_len = dirent->name_len & 0xFF;
 495                 return 1;
 496         }
 497
 498         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dirent->inode)) {
 499                 should_be = EXT2_FT_DIR;
 500         } else if (ext2fs_test_inode_bitmap2(ctx->inode_reg_map,
 501                                             dirent->inode)) {
 502                 should_be = EXT2_FT_REG_FILE;
 503         } else if (ctx->inode_bad_map &&
 504                    ext2fs_test_inode_bitmap2(ctx->inode_bad_map,
 505                                             dirent->inode))
 506                 should_be = 0;
 507         else {
 508                 e2fsck_read_inode(ctx, dirent->inode, &inode,
 509                                   "check_filetype");
 510                 should_be = ext2_file_type(inode.i_mode);
 511         }
 512         if (filetype == should_be)
 513                 return 0;
 514         pctx->num = should_be;
 515
 516         if (fix_problem(ctx, filetype ? PR_2_BAD_FILETYPE : PR_2_SET_FILETYPE,
 517                         pctx) == 0)
 518                 return 0;
 519
 520         dirent->name_len = (dirent->name_len & 0xFF) | should_be << 8;
 521         return 1;
 522 }
 523
 524 #ifdef ENABLE_HTREE
 525 static void parse_int_node(ext2_filsys fs,
 526                            struct ext2_db_entry *db,
 527                            struct check_dir_struct *cd,
 528                            struct dx_dir_info   *dx_dir,
 529                            char *block_buf)
 530 {
 531         struct          ext2_dx_root_info  *root;
 532         struct          ext2_dx_entry *ent;
 533         struct          ext2_dx_countlimit *limit;
 534         struct dx_dirblock_info *dx_db;
 535         int             i, expect_limit, count;
 536         blk_t           blk;
 537         ext2_dirhash_t  min_hash = 0xffffffff;
 538         ext2_dirhash_t  max_hash = 0;
 539         ext2_dirhash_t  hash = 0, prev_hash;
 540
 541         if (db->blockcnt == 0) {
 542                 root = (struct ext2_dx_root_info *) (block_buf + 24);
 543
 544 #ifdef DX_DEBUG
 545                 printf("Root node dump:\n");
 546                 printf("\t Reserved zero: %u\n", root->reserved_zero);
 547                 printf("\t Hash Version: %d\n", root->hash_version);
 548                 printf("\t Info length: %d\n", root->info_length);
 549                 printf("\t Indirect levels: %d\n", root->indirect_levels);
 550                 printf("\t Flags: %d\n", root->unused_flags);
 551 #endif
 552
 553                 ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length);
 554         } else {
 555                 ent = (struct ext2_dx_entry *) (block_buf+8);
 556         }
 557         limit = (struct ext2_dx_countlimit *) ent;
 558
 559 #ifdef DX_DEBUG
 560         printf("Number of entries (count): %d\n",
 561                ext2fs_le16_to_cpu(limit->count));
 562         printf("Number of entries (limit): %d\n",
 563                ext2fs_le16_to_cpu(limit->limit));
 564 #endif
 565
 566         count = ext2fs_le16_to_cpu(limit->count);
 567         expect_limit = (fs->blocksize - ((char *) ent - block_buf)) /
 568                 sizeof(struct ext2_dx_entry);
 569         if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
 570                 cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
 571                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
 572                         goto clear_and_exit;
 573         }
 574         if (count > expect_limit) {
 575                 cd->pctx.num = count;
 576                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_COUNT, &cd->pctx))
 577                         goto clear_and_exit;
 578                 count = expect_limit;
 579         }
 580
 581         for (i=0; i < count; i++) {
 582                 prev_hash = hash;
 583                 hash = i ? (ext2fs_le32_to_cpu(ent[i].hash) & ~1) : 0;
 584 #ifdef DX_DEBUG
 585                 printf("Entry #%d: Hash 0x%08x, block %u\n", i,
 586                        hash, ext2fs_le32_to_cpu(ent[i].block));
 587 #endif
 588                 blk = ext2fs_le32_to_cpu(ent[i].block) & 0x0ffffff;
 589                 /* Check to make sure the block is valid */
 590                 if (blk >= (blk_t) dx_dir->numblocks) {
 591                         cd->pctx.blk = blk;
 592                         if (fix_problem(cd->ctx, PR_2_HTREE_BADBLK,
 593                                         &cd->pctx))
 594                                 goto clear_and_exit;
 595                         continue;
 596                 }
 597                 if (hash < prev_hash &&
 598                     fix_problem(cd->ctx, PR_2_HTREE_HASH_ORDER, &cd->pctx))
 599                         goto clear_and_exit;
 600                 dx_db = &dx_dir->dx_block[blk];
 601                 if (dx_db->flags & DX_FLAG_REFERENCED) {
 602                         dx_db->flags |= DX_FLAG_DUP_REF;
 603                 } else {
 604                         dx_db->flags |= DX_FLAG_REFERENCED;
 605                         dx_db->parent = db->blockcnt;
 606                 }
 607                 if (hash < min_hash)
 608                         min_hash = hash;
 609                 if (hash > max_hash)
 610                         max_hash = hash;
 611                 dx_db->node_min_hash = hash;
 612                 if ((i+1) < count)
 613                         dx_db->node_max_hash =
 614                           ext2fs_le32_to_cpu(ent[i+1].hash) & ~1;
 615                 else {
 616                         dx_db->node_max_hash = 0xfffffffe;
 617                         dx_db->flags |= DX_FLAG_LAST;
 618                 }
 619                 if (i == 0)
 620                         dx_db->flags |= DX_FLAG_FIRST;
 621         }
 622 #ifdef DX_DEBUG
 623         printf("Blockcnt = %d, min hash 0x%08x, max hash 0x%08x\n",
 624                db->blockcnt, min_hash, max_hash);
 625 #endif
 626         dx_db = &dx_dir->dx_block[db->blockcnt];
 627         dx_db->min_hash = min_hash;
 628         dx_db->max_hash = max_hash;
 629         return;
 630
 631 clear_and_exit:
 632         clear_htree(cd->ctx, cd->pctx.ino);
 633         dx_dir->numblocks = 0;
 634 }
 635 #endif /* ENABLE_HTREE */
 636
 637 /*
 638  * Given a busted directory, try to salvage it somehow.
 639  *
 640  */
 641 static void salvage_directory(ext2_filsys fs,
 642                               struct ext2_dir_entry *dirent,
 643                               struct ext2_dir_entry *prev,
 644                               unsigned int *offset)
 645 {
 646         char    *cp = (char *) dirent;
 647         int left;
 648         unsigned int rec_len, prev_rec_len;
 649         unsigned int name_len = dirent->name_len & 0xFF;
 650
 651         (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 652         left = fs->blocksize - *offset - rec_len;
 653
 654         /*
 655          * Special case of directory entry of size 8: copy what's left
 656          * of the directory block up to cover up the invalid hole.
 657          */
 658         if ((left >= 12) && (rec_len == 8)) {
 659                 memmove(cp, cp+8, left);
 660                 memset(cp + left, 0, 8);
 661                 return;
 662         }
 663         /*
 664          * If the directory entry overruns the end of the directory
 665          * block, and the name is small enough to fit, then adjust the
 666          * record length.
 667          */
 668         if ((left < 0) &&
 669             ((int) rec_len + left > 8) &&
 670             (name_len + 8 <= (int) rec_len + left) &&
 671             dirent->inode <= fs->super->s_inodes_count &&
 672             strnlen(dirent->name, name_len) == name_len) {
 673                 (void) ext2fs_set_rec_len(fs, (int) rec_len + left, dirent);
 674                 return;
 675         }
 676         /*
 677          * If the record length of the directory entry is a multiple
 678          * of four, and not too big, such that it is valid, let the
 679          * previous directory entry absorb the invalid one.
 680          */
 681         if (prev && rec_len && (rec_len % 4) == 0 &&
 682             (*offset + rec_len <= fs->blocksize)) {
 683                 (void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
 684                 prev_rec_len += rec_len;
 685                 (void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
 686                 *offset += rec_len;
 687                 return;
 688         }
 689         /*
 690          * Default salvage method --- kill all of the directory
 691          * entries for the rest of the block.  We will either try to
 692          * absorb it into the previous directory entry, or create a
 693          * new empty directory entry the rest of the directory block.
 694          */
 695         if (prev) {
 696                 (void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
 697                 prev_rec_len += fs->blocksize - *offset;
 698                 (void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
 699                 *offset = fs->blocksize;
 700         } else {
 701                 rec_len = fs->blocksize - *offset;
 702                 (void) ext2fs_set_rec_len(fs, rec_len, dirent);
 703                 dirent->name_len = 0;
 704                 dirent->inode = 0;
 705         }
 706 }
 707
 708 static int check_dir_block(ext2_filsys fs,
 709                            struct ext2_db_entry *db,
 710                            void *priv_data)
 711 {
 712         struct dx_dir_info      *dx_dir;
 713 #ifdef ENABLE_HTREE
 714         struct dx_dirblock_info *dx_db = 0;
 715 #endif /* ENABLE_HTREE */
 716         struct ext2_dir_entry   *dirent, *prev;
 717         ext2_dirhash_t          hash;
 718         unsigned int            offset = 0;
 719         const char *            old_op;
 720         int                     dir_modified = 0;
 721         int                     dot_state;
 722         unsigned int            rec_len;
 723         blk_t                   block_nr = db->blk;
 724         ext2_ino_t              ino = db->ino;
 725         ext2_ino_t              subdir_parent;
 726         __u16                   links;
 727         struct check_dir_struct *cd;
 728         char                    *buf;
 729         e2fsck_t                ctx;
 730         int                     problem;
 731         struct ext2_dx_root_info *root;
 732         struct ext2_dx_countlimit *limit;
 733         static dict_t de_dict;
 734         struct problem_context  pctx;
 735         int     dups_found = 0;
 736         int     ret;
 737
 738         cd = (struct check_dir_struct *) priv_data;
 739         buf = cd->buf;
 740         ctx = cd->ctx;
 741
 742         if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
 743                 return DIRENT_ABORT;
 744
 745         if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
 746                 return DIRENT_ABORT;
 747
 748         /*
 749          * Make sure the inode is still in use (could have been
 750          * deleted in the duplicate/bad blocks pass.
 751          */
 752         if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, ino)))
 753                 return 0;
 754
 755         cd->pctx.ino = ino;
 756         cd->pctx.blk = block_nr;
 757         cd->pctx.blkcount = db->blockcnt;
 758         cd->pctx.ino2 = 0;
 759         cd->pctx.dirent = 0;
 760         cd->pctx.num = 0;
 761
 762         if (db->blk == 0) {
 763                 if (allocate_dir_block(ctx, db, buf, &cd->pctx))
 764                         return 0;
 765                 block_nr = db->blk;
 766         }
 767
 768         if (db->blockcnt)
 769                 dot_state = 2;
 770         else
 771                 dot_state = 0;
 772
 773         if (ctx->dirs_to_hash &&
 774             ext2fs_u32_list_test(ctx->dirs_to_hash, ino))
 775                 dups_found++;
 776
 777 #if 0
 778         printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
 779                db->blockcnt, ino);
 780 #endif
 781
 782         old_op = ehandler_operation(_("reading directory block"));
 783         cd->pctx.errcode = ext2fs_read_dir_block(fs, block_nr, buf);
 784         ehandler_operation(0);
 785         if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
 786                 cd->pctx.errcode = 0; /* We'll handle this ourselves */
 787         if (cd->pctx.errcode) {
 788                 if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
 789                         ctx->flags |= E2F_FLAG_ABORT;
 790                         return DIRENT_ABORT;
 791                 }
 792                 memset(buf, 0, fs->blocksize);
 793         }
 794 #ifdef ENABLE_HTREE
 795         dx_dir = e2fsck_get_dx_dir_info(ctx, ino);
 796         if (dx_dir && dx_dir->numblocks) {
 797                 if (db->blockcnt >= dx_dir->numblocks) {
 798                         if (fix_problem(ctx, PR_2_UNEXPECTED_HTREE_BLOCK,
 799                                         &pctx)) {
 800                                 clear_htree(ctx, ino);
 801                                 dx_dir->numblocks = 0;
 802                                 dx_db = 0;
 803                                 goto out_htree;
 804                         }
 805                         fatal_error(ctx, _("Can not continue."));
 806                 }
 807                 dx_db = &dx_dir->dx_block[db->blockcnt];
 808                 dx_db->type = DX_DIRBLOCK_LEAF;
 809                 dx_db->phys = block_nr;
 810                 dx_db->min_hash = ~0;
 811                 dx_db->max_hash = 0;
 812
 813                 dirent = (struct ext2_dir_entry *) buf;
 814                 (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 815                 limit = (struct ext2_dx_countlimit *) (buf+8);
 816                 if (db->blockcnt == 0) {
 817                         root = (struct ext2_dx_root_info *) (buf + 24);
 818                         dx_db->type = DX_DIRBLOCK_ROOT;
 819                         dx_db->flags |= DX_FLAG_FIRST | DX_FLAG_LAST;
 820                         if ((root->reserved_zero ||
 821                              root->info_length < 8 ||
 822                              root->indirect_levels > 1) &&
 823                             fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
 824                                 clear_htree(ctx, ino);
 825                                 dx_dir->numblocks = 0;
 826                                 dx_db = 0;
 827                         }
 828                         dx_dir->hashversion = root->hash_version;
 829                         if ((dx_dir->hashversion <= EXT2_HASH_TEA) &&
 830                             (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
 831                                 dx_dir->hashversion += 3;
 832                         dx_dir->depth = root->indirect_levels + 1;
 833                 } else if ((dirent->inode == 0) &&
 834                            (rec_len == fs->blocksize) &&
 835                            (dirent->name_len == 0) &&
 836                            (ext2fs_le16_to_cpu(limit->limit) ==
 837                             ((fs->blocksize-8) /
 838                              sizeof(struct ext2_dx_entry))))
 839                         dx_db->type = DX_DIRBLOCK_NODE;
 840         }
 841 out_htree:
 842 #endif /* ENABLE_HTREE */
 843
 844         dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
 845         prev = 0;
 846         do {
 847                 int group;
 848                 ext2_ino_t first_unused_inode;
 849
 850                 problem = 0;
 851                 dirent = (struct ext2_dir_entry *) (buf + offset);
 852                 (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 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 & (unsigned) 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_bitmap2(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_bitmap2(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
 984                  * _INODE_UNINIT flag was set or bg_itable_unused was
 985                  * incorrect.  If so, clear the _INODE_UNINIT flag and
 986                  * restart e2fsck.  In the future it would be nice if
 987                  * we could call a function in pass1.c that checks the
 988                  * newly visible inodes.
 989                  */
 990                 if (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)) {
 991                         pctx.num = dirent->inode;
 992                         if (fix_problem(ctx, PR_2_INOREF_BG_INO_UNINIT,
 993                                         &cd->pctx)){
 994                                 ext2fs_bg_flags_clear(fs, group,
 995                                                       EXT2_BG_INODE_UNINIT);
 996                                 ext2fs_mark_super_dirty(fs);
 997                                 ctx->flags |= E2F_FLAG_RESTART_LATER;
 998                         } else {
 999                                 ext2fs_unmark_valid(fs);
1000                                 if (problem == PR_2_BAD_INO)
1001                                         goto next;
1002                         }
1003                 } else if (dirent->inode >= first_unused_inode) {
1004                         pctx.num = dirent->inode;
1005                         if (fix_problem(ctx, PR_2_INOREF_IN_UNUSED, &cd->pctx)){
1006                                 fs->group_desc[group].bg_itable_unused = 0;
1007                                 ext2fs_mark_super_dirty(fs);
1008                                 ctx->flags |= E2F_FLAG_RESTART_LATER;
1009                         } else {
1010                                 ext2fs_unmark_valid(fs);
1011                                 if (problem == PR_2_BAD_INO)
1012                                         goto next;
1013                         }
1014                 }
1015
1016                 if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map,
1017                                                dirent->inode))) {
1018                         /*
1019                          * If the inode is unused, offer to clear it.
1020                          */
1021                         problem = PR_2_UNUSED_INODE;
1022                 }
1023
1024                 if (problem) {
1025                         if (fix_problem(ctx, problem, &cd->pctx)) {
1026                                 dirent->inode = 0;
1027                                 dir_modified++;
1028                                 goto next;
1029                         } else {
1030                                 ext2fs_unmark_valid(fs);
1031                                 if (problem == PR_2_BAD_INO)
1032                                         goto next;
1033                         }
1034                 }
1035
1036                 if (check_name(ctx, dirent, ino, &cd->pctx))
1037                         dir_modified++;
1038
1039                 if (check_filetype(ctx, dirent, ino, &cd->pctx))
1040                         dir_modified++;
1041
1042 #ifdef ENABLE_HTREE
1043                 if (dx_db) {
1044                         ext2fs_dirhash(dx_dir->hashversion, dirent->name,
1045                                        (dirent->name_len & 0xFF),
1046                                        fs->super->s_hash_seed, &hash, 0);
1047                         if (hash < dx_db->min_hash)
1048                                 dx_db->min_hash = hash;
1049                         if (hash > dx_db->max_hash)
1050                                 dx_db->max_hash = hash;
1051                 }
1052 #endif
1053
1054                 /*
1055                  * If this is a directory, then mark its parent in its
1056                  * dir_info structure.  If the parent field is already
1057                  * filled in, then this directory has more than one
1058                  * hard link.  We assume the first link is correct,
1059                  * and ask the user if he/she wants to clear this one.
1060                  */
1061                 if ((dot_state > 1) &&
1062                     (ext2fs_test_inode_bitmap2(ctx->inode_dir_map,
1063                                               dirent->inode))) {
1064                         if (e2fsck_dir_info_get_parent(ctx, dirent->inode,
1065                                                        &subdir_parent)) {
1066                                 cd->pctx.ino = dirent->inode;
1067                                 fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
1068                                 goto abort_free_dict;
1069                         }
1070                         if (subdir_parent) {
1071                                 cd->pctx.ino2 = subdir_parent;
1072                                 if (fix_problem(ctx, PR_2_LINK_DIR,
1073                                                 &cd->pctx)) {
1074                                         dirent->inode = 0;
1075                                         dir_modified++;
1076                                         goto next;
1077                                 }
1078                                 cd->pctx.ino2 = 0;
1079                         } else {
1080                                 (void) e2fsck_dir_info_set_parent(ctx,
1081                                                   dirent->inode, ino);
1082                         }
1083                 }
1084
1085                 if (dups_found) {
1086                         ;
1087                 } else if (dict_lookup(&de_dict, dirent)) {
1088                         clear_problem_context(&pctx);
1089                         pctx.ino = ino;
1090                         pctx.dirent = dirent;
1091                         fix_problem(ctx, PR_2_REPORT_DUP_DIRENT, &pctx);
1092                         if (!ctx->dirs_to_hash)
1093                                 ext2fs_u32_list_create(&ctx->dirs_to_hash, 50);
1094                         if (ctx->dirs_to_hash)
1095                                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1096                         dups_found++;
1097                 } else
1098                         dict_alloc_insert(&de_dict, dirent, dirent);
1099
1100                 ext2fs_icount_increment(ctx->inode_count, dirent->inode,
1101                                         &links);
1102                 if (links > 1)
1103                         ctx->fs_links_count++;
1104                 ctx->fs_total_count++;
1105         next:
1106                 prev = dirent;
1107                 if (dir_modified)
1108                         (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
1109                 offset += rec_len;
1110                 dot_state++;
1111         } while (offset < fs->blocksize);
1112 #if 0
1113         printf("\n");
1114 #endif
1115 #ifdef ENABLE_HTREE
1116         if (dx_db) {
1117 #ifdef DX_DEBUG
1118                 printf("db_block %d, type %d, min_hash 0x%0x, max_hash 0x%0x\n",
1119                        db->blockcnt, dx_db->type,
1120                        dx_db->min_hash, dx_db->max_hash);
1121 #endif
1122                 cd->pctx.dir = cd->pctx.ino;
1123                 if ((dx_db->type == DX_DIRBLOCK_ROOT) ||
1124                     (dx_db->type == DX_DIRBLOCK_NODE))
1125                         parse_int_node(fs, db, cd, dx_dir, buf);
1126         }
1127 #endif /* ENABLE_HTREE */
1128         if (offset != fs->blocksize) {
1129                 cd->pctx.num = rec_len - fs->blocksize + offset;
1130                 if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
1131                         dirent->rec_len = cd->pctx.num;
1132                         dir_modified++;
1133                 }
1134         }
1135         if (dir_modified) {
1136                 cd->pctx.errcode = ext2fs_write_dir_block(fs, block_nr, buf);
1137                 if (cd->pctx.errcode) {
1138                         if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
1139                                          &cd->pctx))
1140                                 goto abort_free_dict;
1141                 }
1142                 ext2fs_mark_changed(fs);
1143         }
1144         dict_free_nodes(&de_dict);
1145         return 0;
1146 abort_free_dict:
1147         ctx->flags |= E2F_FLAG_ABORT;
1148         dict_free_nodes(&de_dict);
1149         return DIRENT_ABORT;
1150 }
1151
1152 /*
1153  * This function is called to deallocate a block, and is an interator
1154  * functioned called by deallocate inode via ext2fs_iterate_block().
1155  */
1156 static int deallocate_inode_block(ext2_filsys fs,
1157                                   blk_t *block_nr,
1158                                   e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
1159                                   blk_t ref_block EXT2FS_ATTR((unused)),
1160                                   int ref_offset EXT2FS_ATTR((unused)),
1161                                   void *priv_data)
1162 {
1163         e2fsck_t        ctx = (e2fsck_t) priv_data;
1164
1165         if (HOLE_BLKADDR(*block_nr))
1166                 return 0;
1167         if ((*block_nr < fs->super->s_first_data_block) ||
1168             (*block_nr >= ext2fs_blocks_count(fs->super)))
1169                 return 0;
1170         ext2fs_unmark_block_bitmap2(ctx->block_found_map, *block_nr);
1171         ext2fs_block_alloc_stats(fs, *block_nr, -1);
1172         return 0;
1173 }
1174
1175 /*
1176  * This fuction deallocates an inode
1177  */
1178 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
1179 {
1180         ext2_filsys fs = ctx->fs;
1181         struct ext2_inode       inode;
1182         struct problem_context  pctx;
1183         __u32                   count;
1184
1185         e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
1186         e2fsck_clear_inode(ctx, ino, &inode, 0, "deallocate_inode");
1187         clear_problem_context(&pctx);
1188         pctx.ino = ino;
1189
1190         /*
1191          * Fix up the bitmaps...
1192          */
1193         e2fsck_read_bitmaps(ctx);
1194         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode));
1195
1196         if (ext2fs_file_acl_block(&inode) &&
1197             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1198                 pctx.errcode = ext2fs_adjust_ea_refcount(fs, ext2fs_file_acl_block(&inode),
1199                                                    block_buf, -1, &count);
1200                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
1201                         pctx.errcode = 0;
1202                         count = 1;
1203                 }
1204                 if (pctx.errcode) {
1205                         pctx.blk = ext2fs_file_acl_block(&inode);
1206                         fix_problem(ctx, PR_2_ADJ_EA_REFCOUNT, &pctx);
1207                         ctx->flags |= E2F_FLAG_ABORT;
1208                         return;
1209                 }
1210                 if (count == 0) {
1211                         ext2fs_unmark_block_bitmap2(ctx->block_found_map,
1212                                                    ext2fs_file_acl_block(&inode));
1213                         ext2fs_block_alloc_stats(fs, ext2fs_file_acl_block(&inode), -1);
1214                 }
1215                 ext2fs_file_acl_block_set(&inode, 0);
1216         }
1217
1218         if (!ext2fs_inode_has_valid_blocks(&inode))
1219                 return;
1220
1221         if (LINUX_S_ISREG(inode.i_mode) &&
1222             (inode.i_size_high || inode.i_size & 0x80000000UL))
1223                 ctx->large_files--;
1224
1225         pctx.errcode = ext2fs_block_iterate2(fs, ino, 0, block_buf,
1226                                             deallocate_inode_block, ctx);
1227         if (pctx.errcode) {
1228                 fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
1229                 ctx->flags |= E2F_FLAG_ABORT;
1230                 return;
1231         }
1232 }
1233
1234 /*
1235  * This fuction clears the htree flag on an inode
1236  */
1237 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino)
1238 {
1239         struct ext2_inode       inode;
1240
1241         e2fsck_read_inode(ctx, ino, &inode, "clear_htree");
1242         inode.i_flags = inode.i_flags & ~EXT2_INDEX_FL;
1243         e2fsck_write_inode(ctx, ino, &inode, "clear_htree");
1244         if (ctx->dirs_to_hash)
1245                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1246 }
1247
1248
1249 extern int e2fsck_process_bad_inode(e2fsck_t ctx, ext2_ino_t dir,
1250                                     ext2_ino_t ino, char *buf)
1251 {
1252         ext2_filsys fs = ctx->fs;
1253         struct ext2_inode       inode;
1254         int                     inode_modified = 0;
1255         int                     not_fixed = 0;
1256         unsigned char           *frag, *fsize;
1257         struct problem_context  pctx;
1258         int     problem = 0;
1259
1260         e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");
1261
1262         clear_problem_context(&pctx);
1263         pctx.ino = ino;
1264         pctx.dir = dir;
1265         pctx.inode = &inode;
1266
1267         if (ext2fs_file_acl_block(&inode) &&
1268             !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1269                 if (fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
1270                         ext2fs_file_acl_block_set(&inode, 0);
1271                         inode_modified++;
1272                 } else
1273                         not_fixed++;
1274         }
1275
1276         if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) &&
1277             !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) &&
1278             !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) &&
1279             !(LINUX_S_ISSOCK(inode.i_mode)))
1280                 problem = PR_2_BAD_MODE;
1281         else if (LINUX_S_ISCHR(inode.i_mode)
1282                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1283                 problem = PR_2_BAD_CHAR_DEV;
1284         else if (LINUX_S_ISBLK(inode.i_mode)
1285                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1286                 problem = PR_2_BAD_BLOCK_DEV;
1287         else if (LINUX_S_ISFIFO(inode.i_mode)
1288                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1289                 problem = PR_2_BAD_FIFO;
1290         else if (LINUX_S_ISSOCK(inode.i_mode)
1291                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1292                 problem = PR_2_BAD_SOCKET;
1293         else if (LINUX_S_ISLNK(inode.i_mode)
1294                  && !e2fsck_pass1_check_symlink(fs, ino, &inode, buf)) {
1295                 problem = PR_2_INVALID_SYMLINK;
1296         }
1297
1298         if (problem) {
1299                 if (fix_problem(ctx, problem, &pctx)) {
1300                         deallocate_inode(ctx, ino, 0);
1301                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
1302                                 return 0;
1303                         return 1;
1304                 } else
1305                         not_fixed++;
1306                 problem = 0;
1307         }
1308
1309         if (inode.i_faddr) {
1310                 if (fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
1311                         inode.i_faddr = 0;
1312                         inode_modified++;
1313                 } else
1314                         not_fixed++;
1315         }
1316
1317         switch (fs->super->s_creator_os) {
1318             case EXT2_OS_HURD:
1319                 frag = &inode.osd2.hurd2.h_i_frag;
1320                 fsize = &inode.osd2.hurd2.h_i_fsize;
1321                 break;
1322             default:
1323                 frag = fsize = 0;
1324         }
1325         if (frag && *frag) {
1326                 pctx.num = *frag;
1327                 if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
1328                         *frag = 0;
1329                         inode_modified++;
1330                 } else
1331                         not_fixed++;
1332                 pctx.num = 0;
1333         }
1334         if (fsize && *fsize) {
1335                 pctx.num = *fsize;
1336                 if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
1337                         *fsize = 0;
1338                         inode_modified++;
1339                 } else
1340                         not_fixed++;
1341                 pctx.num = 0;
1342         }
1343
1344         if ((fs->super->s_creator_os == EXT2_OS_LINUX) &&
1345             !(fs->super->s_feature_ro_compat &
1346               EXT4_FEATURE_RO_COMPAT_HUGE_FILE) &&
1347             (inode.osd2.linux2.l_i_blocks_hi != 0)) {
1348                 pctx.num = inode.osd2.linux2.l_i_blocks_hi;
1349                 if (fix_problem(ctx, PR_2_BLOCKS_HI_ZERO, &pctx)) {
1350                         inode.osd2.linux2.l_i_blocks_hi = 0;
1351                         inode_modified++;
1352                 }
1353         }
1354
1355         if (!(fs->super->s_feature_incompat &
1356              EXT4_FEATURE_INCOMPAT_64BIT) &&
1357             inode.osd2.linux2.l_i_file_acl_high != 0) {
1358                 pctx.num = inode.osd2.linux2.l_i_file_acl_high;
1359                 if (fix_problem(ctx, PR_2_I_FILE_ACL_HI_ZERO, &pctx)) {
1360                         inode.osd2.linux2.l_i_file_acl_high = 0;
1361                         inode_modified++;
1362                 } else
1363                         not_fixed++;
1364         }
1365
1366         if (ext2fs_file_acl_block(&inode) &&
1367             ((ext2fs_file_acl_block(&inode) < fs->super->s_first_data_block) ||
1368              (ext2fs_file_acl_block(&inode) >= ext2fs_blocks_count(fs->super)))) {
1369                 if (fix_problem(ctx, PR_2_FILE_ACL_BAD, &pctx)) {
1370                         ext2fs_file_acl_block_set(&inode, 0);
1371                         inode_modified++;
1372                 } else
1373                         not_fixed++;
1374         }
1375         if (inode.i_dir_acl &&
1376             LINUX_S_ISDIR(inode.i_mode)) {
1377                 if (fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
1378                         inode.i_dir_acl = 0;
1379                         inode_modified++;
1380                 } else
1381                         not_fixed++;
1382         }
1383
1384         if (inode_modified)
1385                 e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
1386         if (!not_fixed && ctx->inode_bad_map)
1387                 ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
1388         return 0;
1389 }
1390
1391
1392 /*
1393  * allocate_dir_block --- this function allocates a new directory
1394  *      block for a particular inode; this is done if a directory has
1395  *      a "hole" in it, or if a directory has a illegal block number
1396  *      that was zeroed out and now needs to be replaced.
1397  */
1398 static int allocate_dir_block(e2fsck_t ctx,
1399                               struct ext2_db_entry *db,
1400                               char *buf EXT2FS_ATTR((unused)),
1401                               struct problem_context *pctx)
1402 {
1403         ext2_filsys fs = ctx->fs;
1404         blk64_t                 blk;
1405         char                    *block;
1406         struct ext2_inode       inode;
1407
1408         if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
1409                 return 1;
1410
1411         /*
1412          * Read the inode and block bitmaps in; we'll be messing with
1413          * them.
1414          */
1415         e2fsck_read_bitmaps(ctx);
1416
1417         /*
1418          * First, find a free block
1419          */
1420         pctx->errcode = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk);
1421         if (pctx->errcode) {
1422                 pctx->str = "ext2fs_new_block";
1423                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1424                 return 1;
1425         }
1426         ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
1427         ext2fs_mark_block_bitmap2(fs->block_map, blk);
1428         ext2fs_mark_bb_dirty(fs);
1429
1430         /*
1431          * Now let's create the actual data block for the inode
1432          */
1433         if (db->blockcnt)
1434                 pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
1435         else
1436                 pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
1437                                                      EXT2_ROOT_INO, &block);
1438
1439         if (pctx->errcode) {
1440                 pctx->str = "ext2fs_new_dir_block";
1441                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1442                 return 1;
1443         }
1444
1445         pctx->errcode = ext2fs_write_dir_block(fs, blk, block);
1446         ext2fs_free_mem(&block);
1447         if (pctx->errcode) {
1448                 pctx->str = "ext2fs_write_dir_block";
1449                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1450                 return 1;
1451         }
1452
1453         /*
1454          * Update the inode block count
1455          */
1456         e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
1457         ext2fs_iblk_add_blocks(fs, &inode, 1);
1458         if (inode.i_size < (db->blockcnt+1) * fs->blocksize)
1459                 inode.i_size = (db->blockcnt+1) * fs->blocksize;
1460         e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");
1461
1462         /*
1463          * Finally, update the block pointers for the inode
1464          */
1465         db->blk = blk;
1466         pctx->errcode = ext2fs_block_iterate2(fs, db->ino, BLOCK_FLAG_HOLE,
1467                                       0, update_dir_block, db);
1468         if (pctx->errcode) {
1469                 pctx->str = "ext2fs_block_iterate";
1470                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1471                 return 1;
1472         }
1473
1474         return 0;
1475 }
1476
1477 /*
1478  * This is a helper function for allocate_dir_block().
1479  */
1480 static int update_dir_block(ext2_filsys fs EXT2FS_ATTR((unused)),
1481                             blk_t       *block_nr,
1482                             e2_blkcnt_t blockcnt,
1483                             blk_t ref_block EXT2FS_ATTR((unused)),
1484                             int ref_offset EXT2FS_ATTR((unused)),
1485                             void *priv_data)
1486 {
1487         struct ext2_db_entry *db;
1488
1489         db = (struct ext2_db_entry *) priv_data;
1490         if (db->blockcnt == (int) blockcnt) {
1491                 *block_nr = db->blk;
1492                 return BLOCK_CHANGED;
1493         }
1494         return 0;
1495 }