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 "config.h"
  46 #include <string.h>
  47
  48 #include "e2fsck.h"
  49 #include "problem.h"
  50 #include "dict.h"
  51
  52 #ifdef NO_INLINE_FUNCS
  53 #define _INLINE_
  54 #else
  55 #define _INLINE_ inline
  56 #endif
  57
  58 /* #define DX_DEBUG */
  59
  60 /*
  61  * Keeps track of how many times an inode is referenced.
  62  */
  63 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf);
  64 static int check_dir_block(ext2_filsys fs,
  65                            struct ext2_db_entry2 *dir_blocks_info,
  66                            void *priv_data);
  67 static int allocate_dir_block(e2fsck_t ctx,
  68                               struct ext2_db_entry2 *dir_blocks_info,
  69                               char *buf, struct problem_context *pctx);
  70 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino);
  71 static int htree_depth(struct dx_dir_info *dx_dir,
  72                        struct dx_dirblock_info *dx_db);
  73 static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b);
  74
  75 struct check_dir_struct {
  76         char *buf;
  77         struct problem_context  pctx;
  78         int     count, max;
  79         e2fsck_t ctx;
  80 };
  81
  82 void e2fsck_pass2(e2fsck_t ctx)
  83 {
  84         struct ext2_super_block *sb = ctx->fs->super;
  85         struct problem_context  pctx;
  86         ext2_filsys             fs = ctx->fs;
  87         char                    *buf;
  88 #ifdef RESOURCE_TRACK
  89         struct resource_track   rtrack;
  90 #endif
  91         struct check_dir_struct cd;
  92         struct dx_dir_info      *dx_dir;
  93         struct dx_dirblock_info *dx_db, *dx_parent;
  94         unsigned int            save_type;
  95         int                     b;
  96         int                     i, depth;
  97         problem_t               code;
  98         int                     bad_dir;
  99
 100         init_resource_track(&rtrack, ctx->fs->io);
 101         clear_problem_context(&cd.pctx);
 102
 103 #ifdef MTRACE
 104         mtrace_print("Pass 2");
 105 #endif
 106
 107         if (!(ctx->options & E2F_OPT_PREEN))
 108                 fix_problem(ctx, PR_2_PASS_HEADER, &cd.pctx);
 109
 110         e2fsck_setup_tdb_icount(ctx, EXT2_ICOUNT_OPT_INCREMENT,
 111                                 &ctx->inode_count);
 112         if (ctx->inode_count)
 113                 cd.pctx.errcode = 0;
 114         else {
 115                 e2fsck_set_bitmap_type(fs, EXT2FS_BMAP64_RBTREE,
 116                                        "inode_count", &save_type);
 117                 cd.pctx.errcode = ext2fs_create_icount2(fs,
 118                                                 EXT2_ICOUNT_OPT_INCREMENT,
 119                                                 0, ctx->inode_link_info,
 120                                                 &ctx->inode_count);
 121                 fs->default_bitmap_type = save_type;
 122         }
 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_count2(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_sort2(fs->dblist, special_dir_block_cmp);
 148
 149         cd.pctx.errcode = ext2fs_dblist_iterate2(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 = ext2fs_dirent_name_len(de_a);
 306         de_b = (const struct ext2_dir_entry *) b;
 307         b_len = ext2fs_dirent_name_len(de_b);
 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_entry2 *db_a =
 324                 (const struct ext2_db_entry2 *) a;
 325         const struct ext2_db_entry2 *db_b =
 326                 (const struct ext2_db_entry2 *) 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         problem_t       problem = 0;
 357
 358         if (!dirent->inode)
 359                 problem = PR_2_MISSING_DOT;
 360         else if ((ext2fs_dirent_name_len(dirent) != 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                         ext2fs_dirent_set_name_len(dirent, 1);
 373                         ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
 374                         dirent->name[0] = '.';
 375                         dirent->name[1] = '\0';
 376                         status = 1;
 377                         created = 1;
 378                 }
 379         }
 380         if (dirent->inode != ino) {
 381                 if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
 382                         dirent->inode = ino;
 383                         status = 1;
 384                 }
 385         }
 386         if (rec_len > 12) {
 387                 new_len = rec_len - 12;
 388                 if (new_len > 12) {
 389                         if (created ||
 390                             fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
 391                                 nextdir = (struct ext2_dir_entry *)
 392                                         ((char *) dirent + 12);
 393                                 dirent->rec_len = 12;
 394                                 (void) ext2fs_set_rec_len(ctx->fs, new_len,
 395                                                           nextdir);
 396                                 nextdir->inode = 0;
 397                                 ext2fs_dirent_set_name_len(nextdir, 0);
 398                                 ext2fs_dirent_set_file_type(nextdir,
 399                                                             EXT2_FT_UNKNOWN);
 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         problem_t       problem = 0;
 417         unsigned int    rec_len;
 418
 419         if (!dirent->inode)
 420                 problem = PR_2_MISSING_DOT_DOT;
 421         else if ((ext2fs_dirent_name_len(dirent) != 2) ||
 422                  (dirent->name[0] != '.') ||
 423                  (dirent->name[1] != '.'))
 424                 problem = PR_2_2ND_NOT_DOT_DOT;
 425         else if (dirent->name[2] != '\0')
 426                 problem = PR_2_DOT_DOT_NULL_TERM;
 427
 428         (void) ext2fs_get_rec_len(ctx->fs, dirent, &rec_len);
 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                         ext2fs_dirent_set_name_len(dirent, 2);
 440                         ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
 441                         dirent->name[0] = '.';
 442                         dirent->name[1] = '.';
 443                         dirent->name[2] = '\0';
 444                         return 1;
 445                 }
 446                 return 0;
 447         }
 448         if (e2fsck_dir_info_set_dotdot(ctx, ino, dirent->inode)) {
 449                 fix_problem(ctx, PR_2_NO_DIRINFO, pctx);
 450                 return -1;
 451         }
 452         return 0;
 453 }
 454
 455 /*
 456  * Check to make sure a directory entry doesn't contain any illegal
 457  * characters.
 458  */
 459 static int check_name(e2fsck_t ctx,
 460                       struct ext2_dir_entry *dirent,
 461                       ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 462                       struct problem_context *pctx)
 463 {
 464         int     i;
 465         int     fixup = -1;
 466         int     ret = 0;
 467
 468         for ( i = 0; i < ext2fs_dirent_name_len(dirent); i++) {
 469                 if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
 470                         if (fixup < 0) {
 471                                 fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
 472                         }
 473                         if (fixup) {
 474                                 dirent->name[i] = '.';
 475                                 ret = 1;
 476                         }
 477                 }
 478         }
 479         return ret;
 480 }
 481
 482 /*
 483  * Check the directory filetype (if present)
 484  */
 485 static _INLINE_ int check_filetype(e2fsck_t ctx,
 486                                    struct ext2_dir_entry *dirent,
 487                                    ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 488                                    struct problem_context *pctx)
 489 {
 490         int     filetype = ext2fs_dirent_file_type(dirent);
 491         int     should_be = EXT2_FT_UNKNOWN;
 492         struct ext2_inode       inode;
 493
 494         if (!(ctx->fs->super->s_feature_incompat &
 495               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 496                 if (filetype == 0 ||
 497                     !fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
 498                         return 0;
 499                 ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
 500                 return 1;
 501         }
 502
 503         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dirent->inode)) {
 504                 should_be = EXT2_FT_DIR;
 505         } else if (ext2fs_test_inode_bitmap2(ctx->inode_reg_map,
 506                                             dirent->inode)) {
 507                 should_be = EXT2_FT_REG_FILE;
 508         } else if (ctx->inode_bad_map &&
 509                    ext2fs_test_inode_bitmap2(ctx->inode_bad_map,
 510                                             dirent->inode))
 511                 should_be = 0;
 512         else {
 513                 e2fsck_read_inode(ctx, dirent->inode, &inode,
 514                                   "check_filetype");
 515                 should_be = ext2_file_type(inode.i_mode);
 516         }
 517         if (filetype == should_be)
 518                 return 0;
 519         pctx->num = should_be;
 520
 521         if (fix_problem(ctx, filetype ? PR_2_BAD_FILETYPE : PR_2_SET_FILETYPE,
 522                         pctx) == 0)
 523                 return 0;
 524
 525         ext2fs_dirent_set_file_type(dirent, should_be);
 526         return 1;
 527 }
 528
 529 #ifdef ENABLE_HTREE
 530 static void parse_int_node(ext2_filsys fs,
 531                            struct ext2_db_entry2 *db,
 532                            struct check_dir_struct *cd,
 533                            struct dx_dir_info   *dx_dir,
 534                            char *block_buf, int failed_csum)
 535 {
 536         struct          ext2_dx_root_info  *root;
 537         struct          ext2_dx_entry *ent;
 538         struct          ext2_dx_countlimit *limit;
 539         struct dx_dirblock_info *dx_db;
 540         int             i, expect_limit, count;
 541         blk_t           blk;
 542         ext2_dirhash_t  min_hash = 0xffffffff;
 543         ext2_dirhash_t  max_hash = 0;
 544         ext2_dirhash_t  hash = 0, prev_hash;
 545         int             csum_size = 0;
 546
 547         if (db->blockcnt == 0) {
 548                 root = (struct ext2_dx_root_info *) (block_buf + 24);
 549
 550 #ifdef DX_DEBUG
 551                 printf("Root node dump:\n");
 552                 printf("\t Reserved zero: %u\n", root->reserved_zero);
 553                 printf("\t Hash Version: %d\n", root->hash_version);
 554                 printf("\t Info length: %d\n", root->info_length);
 555                 printf("\t Indirect levels: %d\n", root->indirect_levels);
 556                 printf("\t Flags: %d\n", root->unused_flags);
 557 #endif
 558
 559                 ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length);
 560
 561                 if (failed_csum &&
 562                     (e2fsck_dir_will_be_rehashed(cd->ctx, cd->pctx.ino) ||
 563                      fix_problem(cd->ctx, PR_2_HTREE_ROOT_CSUM_INVALID,
 564                                 &cd->pctx)))
 565                         goto clear_and_exit;
 566         } else {
 567                 ent = (struct ext2_dx_entry *) (block_buf+8);
 568
 569                 if (failed_csum &&
 570                     (e2fsck_dir_will_be_rehashed(cd->ctx, cd->pctx.ino) ||
 571                      fix_problem(cd->ctx, PR_2_HTREE_NODE_CSUM_INVALID,
 572                                 &cd->pctx)))
 573                         goto clear_and_exit;
 574         }
 575
 576         limit = (struct ext2_dx_countlimit *) ent;
 577
 578 #ifdef DX_DEBUG
 579         printf("Number of entries (count): %d\n",
 580                ext2fs_le16_to_cpu(limit->count));
 581         printf("Number of entries (limit): %d\n",
 582                ext2fs_le16_to_cpu(limit->limit));
 583 #endif
 584
 585         count = ext2fs_le16_to_cpu(limit->count);
 586         if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 587                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
 588                 csum_size = sizeof(struct ext2_dx_tail);
 589         expect_limit = (fs->blocksize -
 590                         (csum_size + ((char *) ent - block_buf))) /
 591                        sizeof(struct ext2_dx_entry);
 592         if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
 593                 cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
 594                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
 595                         goto clear_and_exit;
 596         }
 597         if (count > expect_limit) {
 598                 cd->pctx.num = count;
 599                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_COUNT, &cd->pctx))
 600                         goto clear_and_exit;
 601                 count = expect_limit;
 602         }
 603
 604         for (i=0; i < count; i++) {
 605                 prev_hash = hash;
 606                 hash = i ? (ext2fs_le32_to_cpu(ent[i].hash) & ~1) : 0;
 607 #ifdef DX_DEBUG
 608                 printf("Entry #%d: Hash 0x%08x, block %u\n", i,
 609                        hash, ext2fs_le32_to_cpu(ent[i].block));
 610 #endif
 611                 blk = ext2fs_le32_to_cpu(ent[i].block) & 0x0ffffff;
 612                 /* Check to make sure the block is valid */
 613                 if (blk >= (blk_t) dx_dir->numblocks) {
 614                         cd->pctx.blk = blk;
 615                         if (fix_problem(cd->ctx, PR_2_HTREE_BADBLK,
 616                                         &cd->pctx))
 617                                 goto clear_and_exit;
 618                         continue;
 619                 }
 620                 if (hash < prev_hash &&
 621                     fix_problem(cd->ctx, PR_2_HTREE_HASH_ORDER, &cd->pctx))
 622                         goto clear_and_exit;
 623                 dx_db = &dx_dir->dx_block[blk];
 624                 if (dx_db->flags & DX_FLAG_REFERENCED) {
 625                         dx_db->flags |= DX_FLAG_DUP_REF;
 626                 } else {
 627                         dx_db->flags |= DX_FLAG_REFERENCED;
 628                         dx_db->parent = db->blockcnt;
 629                 }
 630                 if (hash < min_hash)
 631                         min_hash = hash;
 632                 if (hash > max_hash)
 633                         max_hash = hash;
 634                 dx_db->node_min_hash = hash;
 635                 if ((i+1) < count)
 636                         dx_db->node_max_hash =
 637                           ext2fs_le32_to_cpu(ent[i+1].hash) & ~1;
 638                 else {
 639                         dx_db->node_max_hash = 0xfffffffe;
 640                         dx_db->flags |= DX_FLAG_LAST;
 641                 }
 642                 if (i == 0)
 643                         dx_db->flags |= DX_FLAG_FIRST;
 644         }
 645 #ifdef DX_DEBUG
 646         printf("Blockcnt = %d, min hash 0x%08x, max hash 0x%08x\n",
 647                db->blockcnt, min_hash, max_hash);
 648 #endif
 649         dx_db = &dx_dir->dx_block[db->blockcnt];
 650         dx_db->min_hash = min_hash;
 651         dx_db->max_hash = max_hash;
 652         return;
 653
 654 clear_and_exit:
 655         clear_htree(cd->ctx, cd->pctx.ino);
 656         dx_dir->numblocks = 0;
 657         e2fsck_rehash_dir_later(cd->ctx, cd->pctx.ino);
 658 }
 659 #endif /* ENABLE_HTREE */
 660
 661 /*
 662  * Given a busted directory, try to salvage it somehow.
 663  *
 664  */
 665 static void salvage_directory(ext2_filsys fs,
 666                               struct ext2_dir_entry *dirent,
 667                               struct ext2_dir_entry *prev,
 668                               unsigned int *offset)
 669 {
 670         char    *cp = (char *) dirent;
 671         int left;
 672         unsigned int rec_len, prev_rec_len;
 673         unsigned int name_len = ext2fs_dirent_name_len(dirent);
 674
 675         (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 676         left = fs->blocksize - *offset - rec_len;
 677
 678         /*
 679          * Special case of directory entry of size 8: copy what's left
 680          * of the directory block up to cover up the invalid hole.
 681          */
 682         if ((left >= 12) && (rec_len == 8)) {
 683                 memmove(cp, cp+8, left);
 684                 memset(cp + left, 0, 8);
 685                 return;
 686         }
 687         /*
 688          * If the directory entry overruns the end of the directory
 689          * block, and the name is small enough to fit, then adjust the
 690          * record length.
 691          */
 692         if ((left < 0) &&
 693             ((int) rec_len + left > 8) &&
 694             ((int) name_len + 8 <= (int) rec_len + left) &&
 695             dirent->inode <= fs->super->s_inodes_count &&
 696             strnlen(dirent->name, name_len) == name_len) {
 697                 (void) ext2fs_set_rec_len(fs, (int) rec_len + left, dirent);
 698                 return;
 699         }
 700         /*
 701          * If the record length of the directory entry is a multiple
 702          * of four, and not too big, such that it is valid, let the
 703          * previous directory entry absorb the invalid one.
 704          */
 705         if (prev && rec_len && (rec_len % 4) == 0 &&
 706             (*offset + rec_len <= fs->blocksize)) {
 707                 (void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
 708                 prev_rec_len += rec_len;
 709                 (void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
 710                 *offset += rec_len;
 711                 return;
 712         }
 713         /*
 714          * Default salvage method --- kill all of the directory
 715          * entries for the rest of the block.  We will either try to
 716          * absorb it into the previous directory entry, or create a
 717          * new empty directory entry the rest of the directory block.
 718          */
 719         if (prev) {
 720                 (void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
 721                 prev_rec_len += fs->blocksize - *offset;
 722                 (void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
 723                 *offset = fs->blocksize;
 724         } else {
 725                 rec_len = fs->blocksize - *offset;
 726                 (void) ext2fs_set_rec_len(fs, rec_len, dirent);
 727                 ext2fs_dirent_set_name_len(dirent, 0);
 728                 ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
 729                 dirent->inode = 0;
 730         }
 731 }
 732
 733 static int is_last_entry(ext2_filsys fs, int inline_data_size,
 734                          unsigned int offset, int csum_size)
 735 {
 736         if (inline_data_size)
 737                 return (offset < inline_data_size);
 738         else
 739                 return (offset < fs->blocksize - csum_size);
 740 }
 741
 742 static int check_dir_block(ext2_filsys fs,
 743                            struct ext2_db_entry2 *db,
 744                            void *priv_data)
 745 {
 746         struct dx_dir_info      *dx_dir;
 747 #ifdef ENABLE_HTREE
 748         struct dx_dirblock_info *dx_db = 0;
 749 #endif /* ENABLE_HTREE */
 750         struct ext2_dir_entry   *dirent, *prev, dot, dotdot;
 751         ext2_dirhash_t          hash;
 752         unsigned int            offset = 0;
 753         int                     dir_modified = 0;
 754         int                     dot_state;
 755         unsigned int            rec_len;
 756         blk64_t                 block_nr = db->blk;
 757         ext2_ino_t              ino = db->ino;
 758         ext2_ino_t              subdir_parent;
 759         __u16                   links;
 760         struct check_dir_struct *cd;
 761         char                    *buf;
 762         e2fsck_t                ctx;
 763         problem_t               problem;
 764         struct ext2_dx_root_info *root;
 765         struct ext2_dx_countlimit *limit;
 766         static dict_t de_dict;
 767         struct problem_context  pctx;
 768         int     dups_found = 0;
 769         int     ret;
 770         int     dx_csum_size = 0, de_csum_size = 0;
 771         int     failed_csum = 0;
 772         int     is_leaf = 1;
 773         size_t  inline_data_size = 0;
 774         int     filetype = 0;
 775
 776         cd = (struct check_dir_struct *) priv_data;
 777         buf = cd->buf;
 778         ctx = cd->ctx;
 779
 780         if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
 781                 return DIRENT_ABORT;
 782
 783         if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
 784                 return DIRENT_ABORT;
 785
 786         if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 787                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
 788                 dx_csum_size = sizeof(struct ext2_dx_tail);
 789                 de_csum_size = sizeof(struct ext2_dir_entry_tail);
 790         }
 791
 792         if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
 793                                       EXT2_FEATURE_INCOMPAT_FILETYPE))
 794                 filetype = EXT2_FT_DIR << 8;
 795
 796         /*
 797          * Make sure the inode is still in use (could have been
 798          * deleted in the duplicate/bad blocks pass.
 799          */
 800         if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, ino)))
 801                 return 0;
 802
 803         cd->pctx.ino = ino;
 804         cd->pctx.blk = block_nr;
 805         cd->pctx.blkcount = db->blockcnt;
 806         cd->pctx.ino2 = 0;
 807         cd->pctx.dirent = 0;
 808         cd->pctx.num = 0;
 809
 810         if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
 811                                       EXT4_FEATURE_INCOMPAT_INLINE_DATA)) {
 812                 errcode_t ec;
 813
 814                 ec = ext2fs_inline_data_size(fs, ino, &inline_data_size);
 815                 if (ec && ec != EXT2_ET_NO_INLINE_DATA)
 816                         return DIRENT_ABORT;
 817         }
 818
 819         if (db->blk == 0 && !inline_data_size) {
 820                 if (allocate_dir_block(ctx, db, buf, &cd->pctx))
 821                         return 0;
 822                 block_nr = db->blk;
 823         }
 824
 825         if (db->blockcnt)
 826                 dot_state = 2;
 827         else
 828                 dot_state = 0;
 829
 830         if (ctx->dirs_to_hash &&
 831             ext2fs_u32_list_test(ctx->dirs_to_hash, ino))
 832                 dups_found++;
 833
 834 #if 0
 835         printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
 836                db->blockcnt, ino);
 837 #endif
 838
 839         ehandler_operation(_("reading directory block"));
 840         if (inline_data_size)
 841                 cd->pctx.errcode = ext2fs_inline_data_get(fs, ino, 0, buf, 0);
 842         else
 843                 cd->pctx.errcode = ext2fs_read_dir_block4(fs, block_nr,
 844                                                           buf, 0, ino);
 845         ehandler_operation(0);
 846         if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
 847                 cd->pctx.errcode = 0; /* We'll handle this ourselves */
 848         else if (cd->pctx.errcode == EXT2_ET_DIR_CSUM_INVALID) {
 849                 cd->pctx.errcode = 0; /* We'll handle this ourselves */
 850                 failed_csum = 1;
 851         }
 852         if (cd->pctx.errcode) {
 853                 char *buf2;
 854                 if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
 855                         ctx->flags |= E2F_FLAG_ABORT;
 856                         return DIRENT_ABORT;
 857                 }
 858                 ext2fs_new_dir_block(fs, db->blockcnt == 0 ? ino : 0,
 859                                      EXT2_ROOT_INO, &buf2);
 860                 memcpy(buf, buf2, fs->blocksize);
 861                 ext2fs_free_mem(&buf2);
 862         }
 863 #ifdef ENABLE_HTREE
 864         dx_dir = e2fsck_get_dx_dir_info(ctx, ino);
 865         if (dx_dir && dx_dir->numblocks) {
 866                 if (db->blockcnt >= dx_dir->numblocks) {
 867                         if (fix_problem(ctx, PR_2_UNEXPECTED_HTREE_BLOCK,
 868                                         &pctx)) {
 869                                 clear_htree(ctx, ino);
 870                                 dx_dir->numblocks = 0;
 871                                 dx_db = 0;
 872                                 goto out_htree;
 873                         }
 874                         fatal_error(ctx, _("Can not continue."));
 875                 }
 876                 dx_db = &dx_dir->dx_block[db->blockcnt];
 877                 dx_db->type = DX_DIRBLOCK_LEAF;
 878                 dx_db->phys = block_nr;
 879                 dx_db->min_hash = ~0;
 880                 dx_db->max_hash = 0;
 881
 882                 dirent = (struct ext2_dir_entry *) buf;
 883                 (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 884                 limit = (struct ext2_dx_countlimit *) (buf+8);
 885                 if (db->blockcnt == 0) {
 886                         root = (struct ext2_dx_root_info *) (buf + 24);
 887                         dx_db->type = DX_DIRBLOCK_ROOT;
 888                         dx_db->flags |= DX_FLAG_FIRST | DX_FLAG_LAST;
 889                         if ((root->reserved_zero ||
 890                              root->info_length < 8 ||
 891                              root->indirect_levels > 1) &&
 892                             fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
 893                                 clear_htree(ctx, ino);
 894                                 dx_dir->numblocks = 0;
 895                                 dx_db = 0;
 896                         }
 897                         dx_dir->hashversion = root->hash_version;
 898                         if ((dx_dir->hashversion <= EXT2_HASH_TEA) &&
 899                             (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
 900                                 dx_dir->hashversion += 3;
 901                         dx_dir->depth = root->indirect_levels + 1;
 902                 } else if ((dirent->inode == 0) &&
 903                            (rec_len == fs->blocksize) &&
 904                            (ext2fs_dirent_name_len(dirent) == 0) &&
 905                            (ext2fs_le16_to_cpu(limit->limit) ==
 906                             ((fs->blocksize - (8 + dx_csum_size)) /
 907                              sizeof(struct ext2_dx_entry))))
 908                         dx_db->type = DX_DIRBLOCK_NODE;
 909                 is_leaf = 0;
 910         }
 911 out_htree:
 912 #endif /* ENABLE_HTREE */
 913
 914         /* Verify checksum. */
 915         if (is_leaf && de_csum_size && !inline_data_size) {
 916                 /* No space for csum?  Rebuild dirs in pass 3A. */
 917                 if (!ext2fs_dirent_has_tail(fs, (struct ext2_dir_entry *)buf)) {
 918                         de_csum_size = 0;
 919                         if (e2fsck_dir_will_be_rehashed(ctx, ino))
 920                                 goto skip_checksum;
 921                         if (!fix_problem(cd->ctx, PR_2_LEAF_NODE_MISSING_CSUM,
 922                                          &cd->pctx))
 923                                 goto skip_checksum;
 924                         e2fsck_rehash_dir_later(ctx, ino);
 925                         goto skip_checksum;
 926                 }
 927                 if (failed_csum) {
 928                         char *buf2;
 929                         if (!fix_problem(cd->ctx, PR_2_LEAF_NODE_CSUM_INVALID,
 930                                          &cd->pctx))
 931                                 goto skip_checksum;
 932                         ext2fs_new_dir_block(fs,
 933                                              db->blockcnt == 0 ? ino : 0,
 934                                              EXT2_ROOT_INO, &buf2);
 935                         memcpy(buf, buf2, fs->blocksize);
 936                         ext2fs_free_mem(&buf2);
 937                         dir_modified++;
 938                         failed_csum = 0;
 939                 }
 940         }
 941         /* htree nodes don't use fake dirents to store checksums */
 942         if (!is_leaf)
 943                 de_csum_size = 0;
 944
 945 skip_checksum:
 946         dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
 947         prev = 0;
 948         do {
 949                 dgrp_t group;
 950                 ext2_ino_t first_unused_inode;
 951                 unsigned int name_len;
 952
 953                 problem = 0;
 954                 if (!inline_data_size || dot_state > 1) {
 955                         dirent = (struct ext2_dir_entry *) (buf + offset);
 956                         (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 957                         cd->pctx.dirent = dirent;
 958                         cd->pctx.num = offset;
 959                         if (((offset + rec_len) > fs->blocksize) ||
 960                             (rec_len < 12) ||
 961                             ((rec_len % 4) != 0) ||
 962                             ((ext2fs_dirent_name_len(dirent) + 8) > rec_len)) {
 963                                 if (fix_problem(ctx, PR_2_DIR_CORRUPTED, &cd->pctx)) {
 964                                         salvage_directory(fs, dirent, prev, &offset);
 965                                         dir_modified++;
 966                                         continue;
 967                                 } else
 968                                         goto abort_free_dict;
 969                         }
 970                 } else {
 971                         if (dot_state == 0) {
 972                                 memset(&dot, 0, sizeof(dot));
 973                                 dirent = &dot;
 974                                 dirent->inode = ino;
 975                                 dirent->rec_len = EXT2_DIR_REC_LEN(1);
 976                                 dirent->name_len = 1 | filetype;
 977                                 dirent->name[0] = '.';
 978                         } else if (dot_state == 1) {
 979                                 memset(&dotdot, 0, sizeof(dotdot));
 980                                 dirent = &dotdot;
 981                                 dirent->inode =
 982                                         ((struct ext2_dir_entry *)buf)->inode;
 983                                 dirent->rec_len = EXT2_DIR_REC_LEN(2);
 984                                 dirent->name_len = 2 | filetype;
 985                                 dirent->name[0] = '.';
 986                                 dirent->name[1] = '.';
 987                         } else {
 988                                 fatal_error(ctx, _("Can not continue."));
 989                         }
 990                         cd->pctx.dirent = dirent;
 991                         cd->pctx.num = offset;
 992                 }
 993
 994                 if (dot_state == 0) {
 995                         if (check_dot(ctx, dirent, ino, &cd->pctx))
 996                                 dir_modified++;
 997                 } else if (dot_state == 1) {
 998                         ret = check_dotdot(ctx, dirent, ino, &cd->pctx);
 999                         if (ret < 0)
1000                                 goto abort_free_dict;
1001                         if (ret)
1002                                 dir_modified++;
1003                 } else if (dirent->inode == ino) {
1004                         problem = PR_2_LINK_DOT;
1005                         if (fix_problem(ctx, PR_2_LINK_DOT, &cd->pctx)) {
1006                                 dirent->inode = 0;
1007                                 dir_modified++;
1008                                 goto next;
1009                         }
1010                 }
1011                 if (!dirent->inode)
1012                         goto next;
1013
1014                 /*
1015                  * Make sure the inode listed is a legal one.
1016                  */
1017                 name_len = ext2fs_dirent_name_len(dirent);
1018                 if (((dirent->inode != EXT2_ROOT_INO) &&
1019                      (dirent->inode < EXT2_FIRST_INODE(fs->super))) ||
1020                     (dirent->inode > fs->super->s_inodes_count)) {
1021                         problem = PR_2_BAD_INO;
1022                 } else if (ctx->inode_bb_map &&
1023                            (ext2fs_test_inode_bitmap2(ctx->inode_bb_map,
1024                                                      dirent->inode))) {
1025                         /*
1026                          * If the inode is in a bad block, offer to
1027                          * clear it.
1028                          */
1029                         problem = PR_2_BB_INODE;
1030                 } else if ((dot_state > 1) && (name_len == 1) &&
1031                            (dirent->name[0] == '.')) {
1032                         /*
1033                          * If there's a '.' entry in anything other
1034                          * than the first directory entry, it's a
1035                          * duplicate entry that should be removed.
1036                          */
1037                         problem = PR_2_DUP_DOT;
1038                 } else if ((dot_state > 1) && (name_len == 2) &&
1039                            (dirent->name[0] == '.') &&
1040                            (dirent->name[1] == '.')) {
1041                         /*
1042                          * If there's a '..' entry in anything other
1043                          * than the second directory entry, it's a
1044                          * duplicate entry that should be removed.
1045                          */
1046                         problem = PR_2_DUP_DOT_DOT;
1047                 } else if ((dot_state > 1) &&
1048                            (dirent->inode == EXT2_ROOT_INO)) {
1049                         /*
1050                          * Don't allow links to the root directory.
1051                          * We check this specially to make sure we
1052                          * catch this error case even if the root
1053                          * directory hasn't been created yet.
1054                          */
1055                         problem = PR_2_LINK_ROOT;
1056                 } else if ((dot_state > 1) && (name_len == 0)) {
1057                         /*
1058                          * Don't allow zero-length directory names.
1059                          */
1060                         problem = PR_2_NULL_NAME;
1061                 }
1062
1063                 if (problem) {
1064                         if (fix_problem(ctx, problem, &cd->pctx)) {
1065                                 dirent->inode = 0;
1066                                 dir_modified++;
1067                                 goto next;
1068                         } else {
1069                                 ext2fs_unmark_valid(fs);
1070                                 if (problem == PR_2_BAD_INO)
1071                                         goto next;
1072                         }
1073                 }
1074
1075                 /*
1076                  * If the inode was marked as having bad fields in
1077                  * pass1, process it and offer to fix/clear it.
1078                  * (We wait until now so that we can display the
1079                  * pathname to the user.)
1080                  */
1081                 if (ctx->inode_bad_map &&
1082                     ext2fs_test_inode_bitmap2(ctx->inode_bad_map,
1083                                              dirent->inode)) {
1084                         if (e2fsck_process_bad_inode(ctx, ino,
1085                                                      dirent->inode,
1086                                                      buf + fs->blocksize)) {
1087                                 dirent->inode = 0;
1088                                 dir_modified++;
1089                                 goto next;
1090                         }
1091                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
1092                                 return DIRENT_ABORT;
1093                 }
1094
1095                 group = ext2fs_group_of_ino(fs, dirent->inode);
1096                 first_unused_inode = group * fs->super->s_inodes_per_group +
1097                                         1 + fs->super->s_inodes_per_group -
1098                                         ext2fs_bg_itable_unused(fs, group);
1099                 cd->pctx.group = group;
1100
1101                 /*
1102                  * Check if the inode was missed out because
1103                  * _INODE_UNINIT flag was set or bg_itable_unused was
1104                  * incorrect.  If so, clear the _INODE_UNINIT flag and
1105                  * restart e2fsck.  In the future it would be nice if
1106                  * we could call a function in pass1.c that checks the
1107                  * newly visible inodes.
1108                  */
1109                 if (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)) {
1110                         pctx.num = dirent->inode;
1111                         if (fix_problem(ctx, PR_2_INOREF_BG_INO_UNINIT,
1112                                         &cd->pctx)){
1113                                 ext2fs_bg_flags_clear(fs, group,
1114                                                       EXT2_BG_INODE_UNINIT);
1115                                 ext2fs_mark_super_dirty(fs);
1116                                 ctx->flags |= E2F_FLAG_RESTART_LATER;
1117                         } else {
1118                                 ext2fs_unmark_valid(fs);
1119                                 if (problem == PR_2_BAD_INO)
1120                                         goto next;
1121                         }
1122                 } else if (dirent->inode >= first_unused_inode) {
1123                         pctx.num = dirent->inode;
1124                         if (fix_problem(ctx, PR_2_INOREF_IN_UNUSED, &cd->pctx)){
1125                                 ext2fs_bg_itable_unused_set(fs, group, 0);
1126                                 ext2fs_mark_super_dirty(fs);
1127                                 ctx->flags |= E2F_FLAG_RESTART_LATER;
1128                         } else {
1129                                 ext2fs_unmark_valid(fs);
1130                                 if (problem == PR_2_BAD_INO)
1131                                         goto next;
1132                         }
1133                 }
1134
1135                 /*
1136                  * Offer to clear unused inodes; if we are going to be
1137                  * restarting the scan due to bg_itable_unused being
1138                  * wrong, then don't clear any inodes to avoid zapping
1139                  * inodes that were skipped during pass1 due to an
1140                  * incorrect bg_itable_unused; we'll get any real
1141                  * problems after we restart.
1142                  */
1143                 if (!(ctx->flags & E2F_FLAG_RESTART_LATER) &&
1144                     !(ext2fs_test_inode_bitmap2(ctx->inode_used_map,
1145                                                 dirent->inode)))
1146                         problem = PR_2_UNUSED_INODE;
1147
1148                 if (problem) {
1149                         if (fix_problem(ctx, problem, &cd->pctx)) {
1150                                 dirent->inode = 0;
1151                                 dir_modified++;
1152                                 goto next;
1153                         } else {
1154                                 ext2fs_unmark_valid(fs);
1155                                 if (problem == PR_2_BAD_INO)
1156                                         goto next;
1157                         }
1158                 }
1159
1160                 if (check_name(ctx, dirent, ino, &cd->pctx))
1161                         dir_modified++;
1162
1163                 if (check_filetype(ctx, dirent, ino, &cd->pctx))
1164                         dir_modified++;
1165
1166 #ifdef ENABLE_HTREE
1167                 if (dx_db) {
1168                         ext2fs_dirhash(dx_dir->hashversion, dirent->name,
1169                                        ext2fs_dirent_name_len(dirent),
1170                                        fs->super->s_hash_seed, &hash, 0);
1171                         if (hash < dx_db->min_hash)
1172                                 dx_db->min_hash = hash;
1173                         if (hash > dx_db->max_hash)
1174                                 dx_db->max_hash = hash;
1175                 }
1176 #endif
1177
1178                 /*
1179                  * If this is a directory, then mark its parent in its
1180                  * dir_info structure.  If the parent field is already
1181                  * filled in, then this directory has more than one
1182                  * hard link.  We assume the first link is correct,
1183                  * and ask the user if he/she wants to clear this one.
1184                  */
1185                 if ((dot_state > 1) &&
1186                     (ext2fs_test_inode_bitmap2(ctx->inode_dir_map,
1187                                               dirent->inode))) {
1188                         if (e2fsck_dir_info_get_parent(ctx, dirent->inode,
1189                                                        &subdir_parent)) {
1190                                 cd->pctx.ino = dirent->inode;
1191                                 fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
1192                                 goto abort_free_dict;
1193                         }
1194                         if (subdir_parent) {
1195                                 cd->pctx.ino2 = subdir_parent;
1196                                 if (fix_problem(ctx, PR_2_LINK_DIR,
1197                                                 &cd->pctx)) {
1198                                         dirent->inode = 0;
1199                                         dir_modified++;
1200                                         goto next;
1201                                 }
1202                                 cd->pctx.ino2 = 0;
1203                         } else {
1204                                 (void) e2fsck_dir_info_set_parent(ctx,
1205                                                   dirent->inode, ino);
1206                         }
1207                 }
1208
1209                 if (dups_found) {
1210                         ;
1211                 } else if (dict_lookup(&de_dict, dirent)) {
1212                         clear_problem_context(&pctx);
1213                         pctx.ino = ino;
1214                         pctx.dirent = dirent;
1215                         fix_problem(ctx, PR_2_REPORT_DUP_DIRENT, &pctx);
1216                         e2fsck_rehash_dir_later(ctx, ino);
1217                         dups_found++;
1218                 } else
1219                         dict_alloc_insert(&de_dict, dirent, dirent);
1220
1221                 ext2fs_icount_increment(ctx->inode_count, dirent->inode,
1222                                         &links);
1223                 if (links > 1)
1224                         ctx->fs_links_count++;
1225                 ctx->fs_total_count++;
1226         next:
1227                 prev = dirent;
1228                 if (dir_modified)
1229                         (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
1230                 if (!inline_data_size || dot_state > 1) {
1231                         offset += rec_len;
1232                 } else {
1233                         if (dot_state == 1)
1234                                 offset = 4;
1235                 }
1236                 dot_state++;
1237         } while (is_last_entry(fs, inline_data_size, offset, de_csum_size));
1238 #if 0
1239         printf("\n");
1240 #endif
1241 #ifdef ENABLE_HTREE
1242         if (dx_db) {
1243 #ifdef DX_DEBUG
1244                 printf("db_block %d, type %d, min_hash 0x%0x, max_hash 0x%0x\n",
1245                        db->blockcnt, dx_db->type,
1246                        dx_db->min_hash, dx_db->max_hash);
1247 #endif
1248                 cd->pctx.dir = cd->pctx.ino;
1249                 if ((dx_db->type == DX_DIRBLOCK_ROOT) ||
1250                     (dx_db->type == DX_DIRBLOCK_NODE))
1251                         parse_int_node(fs, db, cd, dx_dir, buf, failed_csum);
1252         }
1253 #endif /* ENABLE_HTREE */
1254
1255         if (inline_data_size) {
1256                 if (offset != inline_data_size) {
1257                         cd->pctx.num = rec_len + offset - inline_data_size;
1258                         if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
1259                                 dirent->rec_len = cd->pctx.num;
1260                                 dir_modified++;
1261                         }
1262                 }
1263         } else {
1264                 if (offset != fs->blocksize - de_csum_size) {
1265                         cd->pctx.num = rec_len - (fs->blocksize - de_csum_size) +
1266                                        offset;
1267                         if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
1268                                 dirent->rec_len = cd->pctx.num;
1269                                 dir_modified++;
1270                         }
1271                 }
1272         }
1273         if (dir_modified) {
1274                 /* leaf block with no tail?  Rehash dirs later. */
1275                 if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
1276                                 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
1277                     is_leaf &&
1278                     !ext2fs_dirent_has_tail(fs, (struct ext2_dir_entry *)buf))
1279                         e2fsck_rehash_dir_later(ctx, ino);
1280
1281 write_and_fix:
1282                 if (e2fsck_dir_will_be_rehashed(ctx, ino))
1283                         ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
1284                 if (inline_data_size) {
1285                         cd->pctx.errcode =
1286                                 ext2fs_inline_data_set(fs, ino, 0, buf,
1287                                                        inline_data_size);
1288                 } else
1289                         cd->pctx.errcode = ext2fs_write_dir_block4(fs, block_nr,
1290                                                                    buf, 0, ino);
1291                 if (e2fsck_dir_will_be_rehashed(ctx, ino))
1292                         ctx->fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
1293                 if (cd->pctx.errcode) {
1294                         if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
1295                                          &cd->pctx))
1296                                 goto abort_free_dict;
1297                 }
1298                 ext2fs_mark_changed(fs);
1299         } else if (is_leaf && failed_csum && !dir_modified) {
1300                 /*
1301                  * If a leaf node that fails csum makes it this far without
1302                  * alteration, ask the user if the checksum should be fixed.
1303                  */
1304                 if (fix_problem(ctx, PR_2_LEAF_NODE_ONLY_CSUM_INVALID,
1305                                 &cd->pctx))
1306                         goto write_and_fix;
1307         }
1308         dict_free_nodes(&de_dict);
1309         return 0;
1310 abort_free_dict:
1311         ctx->flags |= E2F_FLAG_ABORT;
1312         dict_free_nodes(&de_dict);
1313         return DIRENT_ABORT;
1314 }
1315
1316 struct del_block {
1317         e2fsck_t        ctx;
1318         e2_blkcnt_t     num;
1319 };
1320
1321 /*
1322  * This function is called to deallocate a block, and is an interator
1323  * functioned called by deallocate inode via ext2fs_iterate_block().
1324  */
1325 static int deallocate_inode_block(ext2_filsys fs,
1326                                   blk64_t       *block_nr,
1327                                   e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
1328                                   blk64_t ref_block EXT2FS_ATTR((unused)),
1329                                   int ref_offset EXT2FS_ATTR((unused)),
1330                                   void *priv_data)
1331 {
1332         struct del_block *p = priv_data;
1333
1334         if (HOLE_BLKADDR(*block_nr))
1335                 return 0;
1336         if ((*block_nr < fs->super->s_first_data_block) ||
1337             (*block_nr >= ext2fs_blocks_count(fs->super)))
1338                 return 0;
1339         ext2fs_unmark_block_bitmap2(p->ctx->block_found_map, *block_nr);
1340         ext2fs_block_alloc_stats2(fs, *block_nr, -1);
1341         p->num++;
1342         return 0;
1343 }
1344
1345 /*
1346  * This fuction deallocates an inode
1347  */
1348 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
1349 {
1350         ext2_filsys fs = ctx->fs;
1351         struct ext2_inode       inode;
1352         struct problem_context  pctx;
1353         __u32                   count;
1354         struct del_block        del_block;
1355
1356         e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
1357         clear_problem_context(&pctx);
1358         pctx.ino = ino;
1359
1360         /*
1361          * Fix up the bitmaps...
1362          */
1363         e2fsck_read_bitmaps(ctx);
1364         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode));
1365
1366         if (ext2fs_file_acl_block(fs, &inode) &&
1367             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1368                 pctx.errcode = ext2fs_adjust_ea_refcount3(fs,
1369                                 ext2fs_file_acl_block(fs, &inode),
1370                                 block_buf, -1, &count, ino);
1371                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
1372                         pctx.errcode = 0;
1373                         count = 1;
1374                 }
1375                 if (pctx.errcode) {
1376                         pctx.blk = ext2fs_file_acl_block(fs, &inode);
1377                         fix_problem(ctx, PR_2_ADJ_EA_REFCOUNT, &pctx);
1378                         ctx->flags |= E2F_FLAG_ABORT;
1379                         return;
1380                 }
1381                 if (count == 0) {
1382                         ext2fs_unmark_block_bitmap2(ctx->block_found_map,
1383                                         ext2fs_file_acl_block(fs, &inode));
1384                         ext2fs_block_alloc_stats2(fs,
1385                                   ext2fs_file_acl_block(fs, &inode), -1);
1386                 }
1387                 ext2fs_file_acl_block_set(fs, &inode, 0);
1388         }
1389
1390         if (!ext2fs_inode_has_valid_blocks2(fs, &inode))
1391                 goto clear_inode;
1392
1393         if (LINUX_S_ISREG(inode.i_mode) &&
1394             ext2fs_needs_large_file_feature(EXT2_I_SIZE(&inode)))
1395                 ctx->large_files--;
1396
1397         del_block.ctx = ctx;
1398         del_block.num = 0;
1399         pctx.errcode = ext2fs_block_iterate3(fs, ino, 0, block_buf,
1400                                              deallocate_inode_block,
1401                                              &del_block);
1402         if (pctx.errcode) {
1403                 fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
1404                 ctx->flags |= E2F_FLAG_ABORT;
1405                 return;
1406         }
1407 clear_inode:
1408         /* Inode may have changed by block_iterate, so reread it */
1409         e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
1410         e2fsck_clear_inode(ctx, ino, &inode, 0, "deallocate_inode");
1411 }
1412
1413 /*
1414  * This fuction clears the htree flag on an inode
1415  */
1416 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino)
1417 {
1418         struct ext2_inode       inode;
1419
1420         e2fsck_read_inode(ctx, ino, &inode, "clear_htree");
1421         inode.i_flags = inode.i_flags & ~EXT2_INDEX_FL;
1422         e2fsck_write_inode(ctx, ino, &inode, "clear_htree");
1423         if (ctx->dirs_to_hash)
1424                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1425 }
1426
1427
1428 int e2fsck_process_bad_inode(e2fsck_t ctx, ext2_ino_t dir,
1429                              ext2_ino_t ino, char *buf)
1430 {
1431         ext2_filsys fs = ctx->fs;
1432         struct ext2_inode       inode;
1433         int                     inode_modified = 0;
1434         int                     not_fixed = 0;
1435         unsigned char           *frag, *fsize;
1436         struct problem_context  pctx;
1437         problem_t               problem = 0;
1438
1439         e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");
1440
1441         clear_problem_context(&pctx);
1442         pctx.ino = ino;
1443         pctx.dir = dir;
1444         pctx.inode = &inode;
1445
1446         if (ext2fs_file_acl_block(fs, &inode) &&
1447             !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1448                 if (fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
1449                         ext2fs_file_acl_block_set(fs, &inode, 0);
1450                         inode_modified++;
1451                 } else
1452                         not_fixed++;
1453         }
1454
1455         if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) &&
1456             !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) &&
1457             !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) &&
1458             !(LINUX_S_ISSOCK(inode.i_mode)))
1459                 problem = PR_2_BAD_MODE;
1460         else if (LINUX_S_ISCHR(inode.i_mode)
1461                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1462                 problem = PR_2_BAD_CHAR_DEV;
1463         else if (LINUX_S_ISBLK(inode.i_mode)
1464                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1465                 problem = PR_2_BAD_BLOCK_DEV;
1466         else if (LINUX_S_ISFIFO(inode.i_mode)
1467                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1468                 problem = PR_2_BAD_FIFO;
1469         else if (LINUX_S_ISSOCK(inode.i_mode)
1470                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1471                 problem = PR_2_BAD_SOCKET;
1472         else if (LINUX_S_ISLNK(inode.i_mode)
1473                  && !e2fsck_pass1_check_symlink(fs, ino, &inode, buf)) {
1474                 problem = PR_2_INVALID_SYMLINK;
1475         }
1476
1477         if (problem) {
1478                 if (fix_problem(ctx, problem, &pctx)) {
1479                         deallocate_inode(ctx, ino, 0);
1480                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
1481                                 return 0;
1482                         return 1;
1483                 } else
1484                         not_fixed++;
1485                 problem = 0;
1486         }
1487
1488         if (inode.i_faddr) {
1489                 if (fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
1490                         inode.i_faddr = 0;
1491                         inode_modified++;
1492                 } else
1493                         not_fixed++;
1494         }
1495
1496         switch (fs->super->s_creator_os) {
1497             case EXT2_OS_HURD:
1498                 frag = &inode.osd2.hurd2.h_i_frag;
1499                 fsize = &inode.osd2.hurd2.h_i_fsize;
1500                 break;
1501             default:
1502                 frag = fsize = 0;
1503         }
1504         if (frag && *frag) {
1505                 pctx.num = *frag;
1506                 if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
1507                         *frag = 0;
1508                         inode_modified++;
1509                 } else
1510                         not_fixed++;
1511                 pctx.num = 0;
1512         }
1513         if (fsize && *fsize) {
1514                 pctx.num = *fsize;
1515                 if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
1516                         *fsize = 0;
1517                         inode_modified++;
1518                 } else
1519                         not_fixed++;
1520                 pctx.num = 0;
1521         }
1522
1523         if ((fs->super->s_creator_os == EXT2_OS_LINUX) &&
1524             !(fs->super->s_feature_ro_compat &
1525               EXT4_FEATURE_RO_COMPAT_HUGE_FILE) &&
1526             (inode.osd2.linux2.l_i_blocks_hi != 0)) {
1527                 pctx.num = inode.osd2.linux2.l_i_blocks_hi;
1528                 if (fix_problem(ctx, PR_2_BLOCKS_HI_ZERO, &pctx)) {
1529                         inode.osd2.linux2.l_i_blocks_hi = 0;
1530                         inode_modified++;
1531                 }
1532         }
1533
1534         if (!(fs->super->s_feature_incompat &
1535              EXT4_FEATURE_INCOMPAT_64BIT) &&
1536             inode.osd2.linux2.l_i_file_acl_high != 0) {
1537                 pctx.num = inode.osd2.linux2.l_i_file_acl_high;
1538                 if (fix_problem(ctx, PR_2_I_FILE_ACL_HI_ZERO, &pctx)) {
1539                         inode.osd2.linux2.l_i_file_acl_high = 0;
1540                         inode_modified++;
1541                 } else
1542                         not_fixed++;
1543         }
1544
1545         if (ext2fs_file_acl_block(fs, &inode) &&
1546             ((ext2fs_file_acl_block(fs, &inode) < fs->super->s_first_data_block) ||
1547              (ext2fs_file_acl_block(fs, &inode) >= ext2fs_blocks_count(fs->super)))) {
1548                 if (fix_problem(ctx, PR_2_FILE_ACL_BAD, &pctx)) {
1549                         ext2fs_file_acl_block_set(fs, &inode, 0);
1550                         inode_modified++;
1551                 } else
1552                         not_fixed++;
1553         }
1554         if (inode.i_dir_acl &&
1555             LINUX_S_ISDIR(inode.i_mode)) {
1556                 if (fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
1557                         inode.i_dir_acl = 0;
1558                         inode_modified++;
1559                 } else
1560                         not_fixed++;
1561         }
1562
1563         if (inode_modified)
1564                 e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
1565         if (!not_fixed && ctx->inode_bad_map)
1566                 ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
1567         return 0;
1568 }
1569
1570
1571 /*
1572  * allocate_dir_block --- this function allocates a new directory
1573  *      block for a particular inode; this is done if a directory has
1574  *      a "hole" in it, or if a directory has a illegal block number
1575  *      that was zeroed out and now needs to be replaced.
1576  */
1577 static int allocate_dir_block(e2fsck_t ctx,
1578                               struct ext2_db_entry2 *db,
1579                               char *buf EXT2FS_ATTR((unused)),
1580                               struct problem_context *pctx)
1581 {
1582         ext2_filsys fs = ctx->fs;
1583         blk64_t                 blk;
1584         char                    *block;
1585         struct ext2_inode       inode;
1586
1587         if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
1588                 return 1;
1589
1590         /*
1591          * Read the inode and block bitmaps in; we'll be messing with
1592          * them.
1593          */
1594         e2fsck_read_bitmaps(ctx);
1595
1596         /*
1597          * First, find a free block
1598          */
1599         pctx->errcode = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk);
1600         if (pctx->errcode) {
1601                 pctx->str = "ext2fs_new_block";
1602                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1603                 return 1;
1604         }
1605         ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
1606         ext2fs_mark_block_bitmap2(fs->block_map, blk);
1607         ext2fs_mark_bb_dirty(fs);
1608
1609         /*
1610          * Now let's create the actual data block for the inode
1611          */
1612         if (db->blockcnt)
1613                 pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
1614         else
1615                 pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
1616                                                      EXT2_ROOT_INO, &block);
1617
1618         if (pctx->errcode) {
1619                 pctx->str = "ext2fs_new_dir_block";
1620                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1621                 return 1;
1622         }
1623
1624         pctx->errcode = ext2fs_write_dir_block4(fs, blk, block, 0, db->ino);
1625         ext2fs_free_mem(&block);
1626         if (pctx->errcode) {
1627                 pctx->str = "ext2fs_write_dir_block";
1628                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1629                 return 1;
1630         }
1631
1632         /*
1633          * Update the inode block count
1634          */
1635         e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
1636         ext2fs_iblk_add_blocks(fs, &inode, 1);
1637         if (inode.i_size < (db->blockcnt+1) * fs->blocksize)
1638                 inode.i_size = (db->blockcnt+1) * fs->blocksize;
1639         e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");
1640
1641         /*
1642          * Finally, update the block pointers for the inode
1643          */
1644         db->blk = blk;
1645         pctx->errcode = ext2fs_bmap2(fs, db->ino, &inode, 0, BMAP_SET,
1646                                      db->blockcnt, 0, &blk);
1647         if (pctx->errcode) {
1648                 pctx->str = "ext2fs_block_iterate";
1649                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1650                 return 1;
1651         }
1652
1653         return 0;
1654 }