e2fsck/pass2.c

   1 /*
   2  * pass2.c --- check directory structure
   3  *
   4  * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Public
   8  * License.
   9  * %End-Header%
  10  *
  11  * Pass 2 of e2fsck iterates through all active directory inodes, and
  12  * applies to following tests to each directory entry in the directory
  13  * blocks in the inodes:
  14  *
  15  *      - The length of the directory entry (rec_len) should be at
  16  *              least 8 bytes, and no more than the remaining space
  17  *              left in the directory block.
  18  *      - The length of the name in the directory entry (name_len)
  19  *              should be less than (rec_len - 8).
  20  *      - The inode number in the directory entry should be within
  21  *              legal bounds.
  22  *      - The inode number should refer to a in-use inode.
  23  *      - The first entry should be '.', and its inode should be
  24  *              the inode of the directory.
  25  *      - The second entry should be '..'.
  26  *
  27  * To minimize disk seek time, the directory blocks are processed in
  28  * sorted order of block numbers.
  29  *
  30  * Pass 2 also collects the following information:
  31  *      - The inode numbers of the subdirectories for each directory.
  32  *
  33  * Pass 2 relies on the following information from previous passes:
  34  *      - The directory information collected in pass 1.
  35  *      - The inode_used_map bitmap
  36  *      - The inode_bad_map bitmap
  37  *      - The inode_dir_map bitmap
  38  *
  39  * Pass 2 frees the following data structures
  40  *      - The inode_bad_map bitmap
  41  *      - The inode_reg_map bitmap
  42  */
  43
  44 #define _GNU_SOURCE 1 /* get strnlen() */
  45 #include <string.h>
  46
  47 #include "e2fsck.h"
  48 #include "problem.h"
  49 #include "dict.h"
  50
  51 #ifdef NO_INLINE_FUNCS
  52 #define _INLINE_
  53 #else
  54 #define _INLINE_ inline
  55 #endif
  56
  57 /* #define DX_DEBUG */
  58
  59 /*
  60  * Keeps track of how many times an inode is referenced.
  61  */
  62 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf);
  63 static int check_dir_block(ext2_filsys fs,
  64                            struct ext2_db_entry *dir_blocks_info,
  65                            void *priv_data);
  66 static int allocate_dir_block(e2fsck_t ctx,
  67                               struct ext2_db_entry *dir_blocks_info,
  68                               char *buf, struct problem_context *pctx);
  69 static int update_dir_block(ext2_filsys fs,
  70                             blk_t       *block_nr,
  71                             e2_blkcnt_t blockcnt,
  72                             blk_t       ref_block,
  73                             int         ref_offset,
  74                             void        *priv_data);
  75 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino);
  76 static int htree_depth(struct dx_dir_info *dx_dir,
  77                        struct dx_dirblock_info *dx_db);
  78 static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b);
  79
  80 struct check_dir_struct {
  81         char *buf;
  82         struct problem_context  pctx;
  83         int     count, max;
  84         e2fsck_t ctx;
  85 };
  86
  87 void e2fsck_pass2(e2fsck_t ctx)
  88 {
  89         struct ext2_super_block *sb = ctx->fs->super;
  90         struct problem_context  pctx;
  91         ext2_filsys             fs = ctx->fs;
  92         char                    *buf;
  93 #ifdef RESOURCE_TRACK
  94         struct resource_track   rtrack;
  95 #endif
  96         struct check_dir_struct cd;
  97         struct dx_dir_info      *dx_dir;
  98         struct dx_dirblock_info *dx_db, *dx_parent;
  99         int                     b;
 100         int                     i, depth;
 101         problem_t               code;
 102         int                     bad_dir;
 103
 104 #ifdef RESOURCE_TRACK
 105         init_resource_track(&rtrack);
 106 #endif
 107
 108         clear_problem_context(&cd.pctx);
 109
 110 #ifdef MTRACE
 111         mtrace_print("Pass 2");
 112 #endif
 113
 114         if (!(ctx->options & E2F_OPT_PREEN))
 115                 fix_problem(ctx, PR_2_PASS_HEADER, &cd.pctx);
 116
 117         e2fsck_setup_tdb_icount(ctx, EXT2_ICOUNT_OPT_INCREMENT,
 118                                 &ctx->inode_count);
 119         if (ctx->inode_count)
 120                 cd.pctx.errcode = 0;
 121         else
 122                 cd.pctx.errcode = ext2fs_create_icount2(fs,
 123                                                 EXT2_ICOUNT_OPT_INCREMENT,
 124                                                 0, ctx->inode_link_info,
 125                                                 &ctx->inode_count);
 126         if (cd.pctx.errcode) {
 127                 fix_problem(ctx, PR_2_ALLOCATE_ICOUNT, &cd.pctx);
 128                 ctx->flags |= E2F_FLAG_ABORT;
 129                 return;
 130         }
 131         buf = (char *) e2fsck_allocate_memory(ctx, 2*fs->blocksize,
 132                                               "directory scan buffer");
 133
 134         /*
 135          * Set up the parent pointer for the root directory, if
 136          * present.  (If the root directory is not present, we will
 137          * create it in pass 3.)
 138          */
 139         (void) e2fsck_dir_info_set_parent(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO);
 140
 141         cd.buf = buf;
 142         cd.ctx = ctx;
 143         cd.count = 1;
 144         cd.max = ext2fs_dblist_count(fs->dblist);
 145
 146         if (ctx->progress)
 147                 (void) (ctx->progress)(ctx, 2, 0, cd.max);
 148
 149         if (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX)
 150                 ext2fs_dblist_sort(fs->dblist, special_dir_block_cmp);
 151
 152         cd.pctx.errcode = ext2fs_dblist_iterate(fs->dblist, check_dir_block,
 153                                                 &cd);
 154         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 155                 return;
 156         if (cd.pctx.errcode) {
 157                 fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
 158                 ctx->flags |= E2F_FLAG_ABORT;
 159                 return;
 160         }
 161
 162 #ifdef ENABLE_HTREE
 163         for (i=0; (dx_dir = e2fsck_dx_dir_info_iter(ctx, &i)) != 0;) {
 164                 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 165                         return;
 166                 if (dx_dir->numblocks == 0)
 167                         continue;
 168                 clear_problem_context(&pctx);
 169                 bad_dir = 0;
 170                 pctx.dir = dx_dir->ino;
 171                 dx_db = dx_dir->dx_block;
 172                 if (dx_db->flags & DX_FLAG_REFERENCED)
 173                         dx_db->flags |= DX_FLAG_DUP_REF;
 174                 else
 175                         dx_db->flags |= DX_FLAG_REFERENCED;
 176                 /*
 177                  * Find all of the first and last leaf blocks, and
 178                  * update their parent's min and max hash values
 179                  */
 180                 for (b=0, dx_db = dx_dir->dx_block;
 181                      b < dx_dir->numblocks;
 182                      b++, dx_db++) {
 183                         if ((dx_db->type != DX_DIRBLOCK_LEAF) ||
 184                             !(dx_db->flags & (DX_FLAG_FIRST | DX_FLAG_LAST)))
 185                                 continue;
 186                         dx_parent = &dx_dir->dx_block[dx_db->parent];
 187                         /*
 188                          * XXX Make sure dx_parent->min_hash > dx_db->min_hash
 189                          */
 190                         if (dx_db->flags & DX_FLAG_FIRST)
 191                                 dx_parent->min_hash = dx_db->min_hash;
 192                         /*
 193                          * XXX Make sure dx_parent->max_hash < dx_db->max_hash
 194                          */
 195                         if (dx_db->flags & DX_FLAG_LAST)
 196                                 dx_parent->max_hash = dx_db->max_hash;
 197                 }
 198
 199                 for (b=0, dx_db = dx_dir->dx_block;
 200                      b < dx_dir->numblocks;
 201                      b++, dx_db++) {
 202                         pctx.blkcount = b;
 203                         pctx.group = dx_db->parent;
 204                         code = 0;
 205                         if (!(dx_db->flags & DX_FLAG_FIRST) &&
 206                             (dx_db->min_hash < dx_db->node_min_hash)) {
 207                                 pctx.blk = dx_db->min_hash;
 208                                 pctx.blk2 = dx_db->node_min_hash;
 209                                 code = PR_2_HTREE_MIN_HASH;
 210                                 fix_problem(ctx, code, &pctx);
 211                                 bad_dir++;
 212                         }
 213                         if (dx_db->type == DX_DIRBLOCK_LEAF) {
 214                                 depth = htree_depth(dx_dir, dx_db);
 215                                 if (depth != dx_dir->depth) {
 216                                         code = PR_2_HTREE_BAD_DEPTH;
 217                                         fix_problem(ctx, code, &pctx);
 218                                         bad_dir++;
 219                                 }
 220                         }
 221                         /*
 222                          * This test doesn't apply for the root block
 223                          * at block #0
 224                          */
 225                         if (b &&
 226                             (dx_db->max_hash > dx_db->node_max_hash)) {
 227                                 pctx.blk = dx_db->max_hash;
 228                                 pctx.blk2 = dx_db->node_max_hash;
 229                                 code = PR_2_HTREE_MAX_HASH;
 230                                 fix_problem(ctx, code, &pctx);
 231                                 bad_dir++;
 232                         }
 233                         if (!(dx_db->flags & DX_FLAG_REFERENCED)) {
 234                                 code = PR_2_HTREE_NOTREF;
 235                                 fix_problem(ctx, code, &pctx);
 236                                 bad_dir++;
 237                         } else if (dx_db->flags & DX_FLAG_DUP_REF) {
 238                                 code = PR_2_HTREE_DUPREF;
 239                                 fix_problem(ctx, code, &pctx);
 240                                 bad_dir++;
 241                         }
 242                         if (code == 0)
 243                                 continue;
 244                 }
 245                 if (bad_dir && fix_problem(ctx, PR_2_HTREE_CLEAR, &pctx)) {
 246                         clear_htree(ctx, dx_dir->ino);
 247                         dx_dir->numblocks = 0;
 248                 }
 249         }
 250 #endif
 251         ext2fs_free_mem(&buf);
 252         ext2fs_free_dblist(fs->dblist);
 253
 254         if (ctx->inode_bad_map) {
 255                 ext2fs_free_inode_bitmap(ctx->inode_bad_map);
 256                 ctx->inode_bad_map = 0;
 257         }
 258         if (ctx->inode_reg_map) {
 259                 ext2fs_free_inode_bitmap(ctx->inode_reg_map);
 260                 ctx->inode_reg_map = 0;
 261         }
 262
 263         clear_problem_context(&pctx);
 264         if (ctx->large_files) {
 265                 if (!(sb->s_feature_ro_compat &
 266                       EXT2_FEATURE_RO_COMPAT_LARGE_FILE) &&
 267                     fix_problem(ctx, PR_2_FEATURE_LARGE_FILES, &pctx)) {
 268                         sb->s_feature_ro_compat |=
 269                                 EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
 270                         ext2fs_mark_super_dirty(fs);
 271                 }
 272                 if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 273                     fix_problem(ctx, PR_1_FS_REV_LEVEL, &pctx)) {
 274                         ext2fs_update_dynamic_rev(fs);
 275                         ext2fs_mark_super_dirty(fs);
 276                 }
 277         } else if (!ctx->large_files &&
 278             (sb->s_feature_ro_compat &
 279               EXT2_FEATURE_RO_COMPAT_LARGE_FILE)) {
 280                 if (fs->flags & EXT2_FLAG_RW) {
 281                         sb->s_feature_ro_compat &=
 282                                 ~EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
 283                         ext2fs_mark_super_dirty(fs);
 284                 }
 285         }
 286
 287 #ifdef RESOURCE_TRACK
 288         if (ctx->options & E2F_OPT_TIME2) {
 289                 e2fsck_clear_progbar(ctx);
 290                 print_resource_track(_("Pass 2"), &rtrack);
 291         }
 292 #endif
 293 }
 294
 295 #define MAX_DEPTH 32000
 296 static int htree_depth(struct dx_dir_info *dx_dir,
 297                        struct dx_dirblock_info *dx_db)
 298 {
 299         int     depth = 0;
 300
 301         while (dx_db->type != DX_DIRBLOCK_ROOT && depth < MAX_DEPTH) {
 302                 dx_db = &dx_dir->dx_block[dx_db->parent];
 303                 depth++;
 304         }
 305         return depth;
 306 }
 307
 308 static int dict_de_cmp(const void *a, const void *b)
 309 {
 310         const struct ext2_dir_entry *de_a, *de_b;
 311         int     a_len, b_len;
 312
 313         de_a = (const struct ext2_dir_entry *) a;
 314         a_len = de_a->name_len & 0xFF;
 315         de_b = (const struct ext2_dir_entry *) b;
 316         b_len = de_b->name_len & 0xFF;
 317
 318         if (a_len != b_len)
 319                 return (a_len - b_len);
 320
 321         return strncmp(de_a->name, de_b->name, a_len);
 322 }
 323
 324 /*
 325  * This is special sort function that makes sure that directory blocks
 326  * with a dirblock of zero are sorted to the beginning of the list.
 327  * This guarantees that the root node of the htree directories are
 328  * processed first, so we know what hash version to use.
 329  */
 330 static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b)
 331 {
 332         const struct ext2_db_entry *db_a =
 333                 (const struct ext2_db_entry *) a;
 334         const struct ext2_db_entry *db_b =
 335                 (const struct ext2_db_entry *) b;
 336
 337         if (db_a->blockcnt && !db_b->blockcnt)
 338                 return 1;
 339
 340         if (!db_a->blockcnt && db_b->blockcnt)
 341                 return -1;
 342
 343         if (db_a->blk != db_b->blk)
 344                 return (int) (db_a->blk - db_b->blk);
 345
 346         if (db_a->ino != db_b->ino)
 347                 return (int) (db_a->ino - db_b->ino);
 348
 349         return (int) (db_a->blockcnt - db_b->blockcnt);
 350 }
 351
 352
 353 /*
 354  * Make sure the first entry in the directory is '.', and that the
 355  * directory entry is sane.
 356  */
 357 static int check_dot(e2fsck_t ctx,
 358                      struct ext2_dir_entry *dirent,
 359                      ext2_ino_t ino, struct problem_context *pctx)
 360 {
 361         struct ext2_dir_entry *nextdir;
 362         int     status = 0;
 363         int     created = 0;
 364         int     new_len;
 365         int     problem = 0;
 366
 367         if (!dirent->inode)
 368                 problem = PR_2_MISSING_DOT;
 369         else if (((dirent->name_len & 0xFF) != 1) ||
 370                  (dirent->name[0] != '.'))
 371                 problem = PR_2_1ST_NOT_DOT;
 372         else if (dirent->name[1] != '\0')
 373                 problem = PR_2_DOT_NULL_TERM;
 374
 375         if (problem) {
 376                 if (fix_problem(ctx, problem, pctx)) {
 377                         if (dirent->rec_len < 12)
 378                                 dirent->rec_len = 12;
 379                         dirent->inode = ino;
 380                         dirent->name_len = 1;
 381                         dirent->name[0] = '.';
 382                         dirent->name[1] = '\0';
 383                         status = 1;
 384                         created = 1;
 385                 }
 386         }
 387         if (dirent->inode != ino) {
 388                 if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
 389                         dirent->inode = ino;
 390                         status = 1;
 391                 }
 392         }
 393         if (dirent->rec_len > 12) {
 394                 new_len = dirent->rec_len - 12;
 395                 if (new_len > 12) {
 396                         if (created ||
 397                             fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
 398                                 nextdir = (struct ext2_dir_entry *)
 399                                         ((char *) dirent + 12);
 400                                 dirent->rec_len = 12;
 401                                 nextdir->rec_len = new_len;
 402                                 nextdir->inode = 0;
 403                                 nextdir->name_len = 0;
 404                                 status = 1;
 405                         }
 406                 }
 407         }
 408         return status;
 409 }
 410
 411 /*
 412  * Make sure the second entry in the directory is '..', and that the
 413  * directory entry is sane.  We do not check the inode number of '..'
 414  * here; this gets done in pass 3.
 415  */
 416 static int check_dotdot(e2fsck_t ctx,
 417                         struct ext2_dir_entry *dirent,
 418                         ext2_ino_t ino, struct problem_context *pctx)
 419 {
 420         int                     problem = 0;
 421
 422         if (!dirent->inode)
 423                 problem = PR_2_MISSING_DOT_DOT;
 424         else if (((dirent->name_len & 0xFF) != 2) ||
 425                  (dirent->name[0] != '.') ||
 426                  (dirent->name[1] != '.'))
 427                 problem = PR_2_2ND_NOT_DOT_DOT;
 428         else if (dirent->name[2] != '\0')
 429                 problem = PR_2_DOT_DOT_NULL_TERM;
 430
 431         if (problem) {
 432                 if (fix_problem(ctx, problem, pctx)) {
 433                         if (dirent->rec_len < 12)
 434                                 dirent->rec_len = 12;
 435                         /*
 436                          * Note: we don't have the parent inode just
 437                          * yet, so we will fill it in with the root
 438                          * inode.  This will get fixed in pass 3.
 439                          */
 440                         dirent->inode = EXT2_ROOT_INO;
 441                         dirent->name_len = 2;
 442                         dirent->name[0] = '.';
 443                         dirent->name[1] = '.';
 444                         dirent->name[2] = '\0';
 445                         return 1;
 446                 }
 447                 return 0;
 448         }
 449         if (e2fsck_dir_info_set_dotdot(ctx, ino, dirent->inode)) {
 450                 fix_problem(ctx, PR_2_NO_DIRINFO, pctx);
 451                 return -1;
 452         }
 453         return 0;
 454 }
 455
 456 /*
 457  * Check to make sure a directory entry doesn't contain any illegal
 458  * characters.
 459  */
 460 static int check_name(e2fsck_t ctx,
 461                       struct ext2_dir_entry *dirent,
 462                       ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 463                       struct problem_context *pctx)
 464 {
 465         int     i;
 466         int     fixup = -1;
 467         int     ret = 0;
 468
 469         for ( i = 0; i < (dirent->name_len & 0xFF); i++) {
 470                 if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
 471                         if (fixup < 0) {
 472                                 fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
 473                         }
 474                         if (fixup) {
 475                                 dirent->name[i] = '.';
 476                                 ret = 1;
 477                         }
 478                 }
 479         }
 480         return ret;
 481 }
 482
 483 /*
 484  * Check the directory filetype (if present)
 485  */
 486 static _INLINE_ int check_filetype(e2fsck_t ctx,
 487                                    struct ext2_dir_entry *dirent,
 488                                    ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 489                                    struct problem_context *pctx)
 490 {
 491         int     filetype = dirent->name_len >> 8;
 492         int     should_be = EXT2_FT_UNKNOWN;
 493         struct ext2_inode       inode;
 494
 495         if (!(ctx->fs->super->s_feature_incompat &
 496               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 497                 if (filetype == 0 ||
 498                     !fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
 499                         return 0;
 500                 dirent->name_len = dirent->name_len & 0xFF;
 501                 return 1;
 502         }
 503
 504         if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, dirent->inode)) {
 505                 should_be = EXT2_FT_DIR;
 506         } else if (ext2fs_test_inode_bitmap(ctx->inode_reg_map,
 507                                             dirent->inode)) {
 508                 should_be = EXT2_FT_REG_FILE;
 509         } else if (ctx->inode_bad_map &&
 510                    ext2fs_test_inode_bitmap(ctx->inode_bad_map,
 511                                             dirent->inode))
 512                 should_be = 0;
 513         else {
 514                 e2fsck_read_inode(ctx, dirent->inode, &inode,
 515                                   "check_filetype");
 516                 should_be = ext2_file_type(inode.i_mode);
 517         }
 518         if (filetype == should_be)
 519                 return 0;
 520         pctx->num = should_be;
 521
 522         if (fix_problem(ctx, filetype ? PR_2_BAD_FILETYPE : PR_2_SET_FILETYPE,
 523                         pctx) == 0)
 524                 return 0;
 525
 526         dirent->name_len = (dirent->name_len & 0xFF) | should_be << 8;
 527         return 1;
 528 }
 529
 530 #ifdef ENABLE_HTREE
 531 static void parse_int_node(ext2_filsys fs,
 532                            struct ext2_db_entry *db,
 533                            struct check_dir_struct *cd,
 534                            struct dx_dir_info   *dx_dir,
 535                            char *block_buf)
 536 {
 537         struct          ext2_dx_root_info  *root;
 538         struct          ext2_dx_entry *ent;
 539         struct          ext2_dx_countlimit *limit;
 540         struct dx_dirblock_info *dx_db;
 541         int             i, expect_limit, count;
 542         blk_t           blk;
 543         ext2_dirhash_t  min_hash = 0xffffffff;
 544         ext2_dirhash_t  max_hash = 0;
 545         ext2_dirhash_t  hash = 0, prev_hash;
 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         } else {
 561                 ent = (struct ext2_dx_entry *) (block_buf+8);
 562         }
 563         limit = (struct ext2_dx_countlimit *) ent;
 564
 565 #ifdef DX_DEBUG
 566         printf("Number of entries (count): %d\n",
 567                ext2fs_le16_to_cpu(limit->count));
 568         printf("Number of entries (limit): %d\n",
 569                ext2fs_le16_to_cpu(limit->limit));
 570 #endif
 571
 572         count = ext2fs_le16_to_cpu(limit->count);
 573         expect_limit = (fs->blocksize - ((char *) ent - block_buf)) /
 574                 sizeof(struct ext2_dx_entry);
 575         if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
 576                 cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
 577                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
 578                         goto clear_and_exit;
 579         }
 580         if (count > expect_limit) {
 581                 cd->pctx.num = count;
 582                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_COUNT, &cd->pctx))
 583                         goto clear_and_exit;
 584                 count = expect_limit;
 585         }
 586
 587         for (i=0; i < count; i++) {
 588                 prev_hash = hash;
 589                 hash = i ? (ext2fs_le32_to_cpu(ent[i].hash) & ~1) : 0;
 590 #ifdef DX_DEBUG
 591                 printf("Entry #%d: Hash 0x%08x, block %u\n", i,
 592                        hash, ext2fs_le32_to_cpu(ent[i].block));
 593 #endif
 594                 blk = ext2fs_le32_to_cpu(ent[i].block) & 0x0ffffff;
 595                 /* Check to make sure the block is valid */
 596                 if (blk >= (blk_t) dx_dir->numblocks) {
 597                         cd->pctx.blk = blk;
 598                         if (fix_problem(cd->ctx, PR_2_HTREE_BADBLK,
 599                                         &cd->pctx))
 600                                 goto clear_and_exit;
 601                         continue;
 602                 }
 603                 if (hash < prev_hash &&
 604                     fix_problem(cd->ctx, PR_2_HTREE_HASH_ORDER, &cd->pctx))
 605                         goto clear_and_exit;
 606                 dx_db = &dx_dir->dx_block[blk];
 607                 if (dx_db->flags & DX_FLAG_REFERENCED) {
 608                         dx_db->flags |= DX_FLAG_DUP_REF;
 609                 } else {
 610                         dx_db->flags |= DX_FLAG_REFERENCED;
 611                         dx_db->parent = db->blockcnt;
 612                 }
 613                 if (hash < min_hash)
 614                         min_hash = hash;
 615                 if (hash > max_hash)
 616                         max_hash = hash;
 617                 dx_db->node_min_hash = hash;
 618                 if ((i+1) < count)
 619                         dx_db->node_max_hash =
 620                           ext2fs_le32_to_cpu(ent[i+1].hash) & ~1;
 621                 else {
 622                         dx_db->node_max_hash = 0xfffffffe;
 623                         dx_db->flags |= DX_FLAG_LAST;
 624                 }
 625                 if (i == 0)
 626                         dx_db->flags |= DX_FLAG_FIRST;
 627         }
 628 #ifdef DX_DEBUG
 629         printf("Blockcnt = %d, min hash 0x%08x, max hash 0x%08x\n",
 630                db->blockcnt, min_hash, max_hash);
 631 #endif
 632         dx_db = &dx_dir->dx_block[db->blockcnt];
 633         dx_db->min_hash = min_hash;
 634         dx_db->max_hash = max_hash;
 635         return;
 636
 637 clear_and_exit:
 638         clear_htree(cd->ctx, cd->pctx.ino);
 639         dx_dir->numblocks = 0;
 640 }
 641 #endif /* ENABLE_HTREE */
 642
 643 /*
 644  * Given a busted directory, try to salvage it somehow.
 645  *
 646  */
 647 static void salvage_directory(ext2_filsys fs,
 648                               struct ext2_dir_entry *dirent,
 649                               struct ext2_dir_entry *prev,
 650                               unsigned int *offset)
 651 {
 652         char    *cp = (char *) dirent;
 653         int left = fs->blocksize - *offset - dirent->rec_len;
 654         unsigned int name_len = dirent->name_len & 0xFF;
 655
 656         /*
 657          * Special case of directory entry of size 8: copy what's left
 658          * of the directory block up to cover up the invalid hole.
 659          */
 660         if ((left >= 12) && (dirent->rec_len == 8)) {
 661                 memmove(cp, cp+8, left);
 662                 memset(cp + left, 0, 8);
 663                 return;
 664         }
 665         /*
 666          * If the directory entry overruns the end of the directory
 667          * block, and the name is small enough to fit, then adjust the
 668          * record length.
 669          */
 670         if ((left < 0) &&
 671             (name_len + 8 <= dirent->rec_len + (unsigned) left) &&
 672             dirent->inode <= fs->super->s_inodes_count &&
 673             strnlen(dirent->name, name_len) == name_len) {
 674                 dirent->rec_len += left;
 675                 return;
 676         }
 677         /*
 678          * If the directory entry is a multiple of four, so it is
 679          * valid, let the previous directory entry absorb the invalid
 680          * one.
 681          */
 682         if (prev && dirent->rec_len && (dirent->rec_len % 4) == 0) {
 683                 prev->rec_len += dirent->rec_len;
 684                 *offset += dirent->rec_len;
 685                 return;
 686         }
 687         /*
 688          * Default salvage method --- kill all of the directory
 689          * entries for the rest of the block.  We will either try to
 690          * absorb it into the previous directory entry, or create a
 691          * new empty directory entry the rest of the directory block.
 692          */
 693         if (prev) {
 694                 prev->rec_len += fs->blocksize - *offset;
 695                 *offset = fs->blocksize;
 696         } else {
 697                 dirent->rec_len = fs->blocksize - *offset;
 698                 dirent->name_len = 0;
 699                 dirent->inode = 0;
 700         }
 701 }
 702
 703 static int check_dir_block(ext2_filsys fs,
 704                            struct ext2_db_entry *db,
 705                            void *priv_data)
 706 {
 707         struct dir_info         *subdir;
 708         struct dx_dir_info      *dx_dir;
 709 #ifdef ENABLE_HTREE
 710         struct dx_dirblock_info *dx_db = 0;
 711 #endif /* ENABLE_HTREE */
 712         struct ext2_dir_entry   *dirent, *prev;
 713         ext2_dirhash_t          hash;
 714         unsigned int            offset = 0;
 715         int                     dir_modified = 0;
 716         int                     dot_state;
 717         blk_t                   block_nr = db->blk;
 718         ext2_ino_t              ino = db->ino;
 719         ext2_ino_t              subdir_parent;
 720         __u16                   links;
 721         struct check_dir_struct *cd;
 722         char                    *buf;
 723         e2fsck_t                ctx;
 724         int                     problem;
 725         struct ext2_dx_root_info *root;
 726         struct ext2_dx_countlimit *limit;
 727         static dict_t de_dict;
 728         struct problem_context  pctx;
 729         int     dups_found = 0;
 730         int     ret;
 731
 732         cd = (struct check_dir_struct *) priv_data;
 733         buf = cd->buf;
 734         ctx = cd->ctx;
 735
 736         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 737                 return DIRENT_ABORT;
 738
 739         if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
 740                 return DIRENT_ABORT;
 741
 742         /*
 743          * Make sure the inode is still in use (could have been
 744          * deleted in the duplicate/bad blocks pass.
 745          */
 746         if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, ino)))
 747                 return 0;
 748
 749         cd->pctx.ino = ino;
 750         cd->pctx.blk = block_nr;
 751         cd->pctx.blkcount = db->blockcnt;
 752         cd->pctx.ino2 = 0;
 753         cd->pctx.dirent = 0;
 754         cd->pctx.num = 0;
 755
 756         if (db->blk == 0) {
 757                 if (allocate_dir_block(ctx, db, buf, &cd->pctx))
 758                         return 0;
 759                 block_nr = db->blk;
 760         }
 761
 762         if (db->blockcnt)
 763                 dot_state = 2;
 764         else
 765                 dot_state = 0;
 766
 767         if (ctx->dirs_to_hash &&
 768             ext2fs_u32_list_test(ctx->dirs_to_hash, ino))
 769                 dups_found++;
 770
 771 #if 0
 772         printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
 773                db->blockcnt, ino);
 774 #endif
 775
 776         cd->pctx.errcode = ext2fs_read_dir_block(fs, block_nr, buf);
 777         if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
 778                 cd->pctx.errcode = 0; /* We'll handle this ourselves */
 779         if (cd->pctx.errcode) {
 780                 if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
 781                         ctx->flags |= E2F_FLAG_ABORT;
 782                         return DIRENT_ABORT;
 783                 }
 784                 memset(buf, 0, fs->blocksize);
 785         }
 786 #ifdef ENABLE_HTREE
 787         dx_dir = e2fsck_get_dx_dir_info(ctx, ino);
 788         if (dx_dir && dx_dir->numblocks) {
 789                 if (db->blockcnt >= dx_dir->numblocks) {
 790                         printf("XXX should never happen!!!\n");
 791                         abort();
 792                 }
 793                 dx_db = &dx_dir->dx_block[db->blockcnt];
 794                 dx_db->type = DX_DIRBLOCK_LEAF;
 795                 dx_db->phys = block_nr;
 796                 dx_db->min_hash = ~0;
 797                 dx_db->max_hash = 0;
 798
 799                 dirent = (struct ext2_dir_entry *) buf;
 800                 limit = (struct ext2_dx_countlimit *) (buf+8);
 801                 if (db->blockcnt == 0) {
 802                         root = (struct ext2_dx_root_info *) (buf + 24);
 803                         dx_db->type = DX_DIRBLOCK_ROOT;
 804                         dx_db->flags |= DX_FLAG_FIRST | DX_FLAG_LAST;
 805                         if ((root->reserved_zero ||
 806                              root->info_length < 8 ||
 807                              root->indirect_levels > 1) &&
 808                             fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
 809                                 clear_htree(ctx, ino);
 810                                 dx_dir->numblocks = 0;
 811                                 dx_db = 0;
 812                         }
 813                         dx_dir->hashversion = root->hash_version;
 814                         if ((dx_dir->hashversion <= EXT2_HASH_TEA) &&
 815                             (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
 816                                 dx_dir->hashversion += 3;
 817                         dx_dir->depth = root->indirect_levels + 1;
 818                 } else if ((dirent->inode == 0) &&
 819                            (dirent->rec_len == fs->blocksize) &&
 820                            (dirent->name_len == 0) &&
 821                            (ext2fs_le16_to_cpu(limit->limit) ==
 822                             ((fs->blocksize-8) /
 823                              sizeof(struct ext2_dx_entry))))
 824                         dx_db->type = DX_DIRBLOCK_NODE;
 825         }
 826 #endif /* ENABLE_HTREE */
 827
 828         dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
 829         prev = 0;
 830         do {
 831                 problem = 0;
 832                 dirent = (struct ext2_dir_entry *) (buf + offset);
 833                 cd->pctx.dirent = dirent;
 834                 cd->pctx.num = offset;
 835                 if (((offset + dirent->rec_len) > fs->blocksize) ||
 836                     (dirent->rec_len < 12) ||
 837                     ((dirent->rec_len % 4) != 0) ||
 838                     (((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
 839                         if (fix_problem(ctx, PR_2_DIR_CORRUPTED, &cd->pctx)) {
 840                                 salvage_directory(fs, dirent, prev, &offset);
 841                                 dir_modified++;
 842                                 continue;
 843                         } else
 844                                 goto abort_free_dict;
 845                 }
 846                 if ((dirent->name_len & 0xFF) > EXT2_NAME_LEN) {
 847                         if (fix_problem(ctx, PR_2_FILENAME_LONG, &cd->pctx)) {
 848                                 dirent->name_len = EXT2_NAME_LEN;
 849                                 dir_modified++;
 850                         }
 851                 }
 852
 853                 if (dot_state == 0) {
 854                         if (check_dot(ctx, dirent, ino, &cd->pctx))
 855                                 dir_modified++;
 856                 } else if (dot_state == 1) {
 857                         ret = check_dotdot(ctx, dirent, ino, &cd->pctx);
 858                         if (ret < 0)
 859                                 goto abort_free_dict;
 860                         if (ret)
 861                                 dir_modified++;
 862                 } else if (dirent->inode == ino) {
 863                         problem = PR_2_LINK_DOT;
 864                         if (fix_problem(ctx, PR_2_LINK_DOT, &cd->pctx)) {
 865                                 dirent->inode = 0;
 866                                 dir_modified++;
 867                                 goto next;
 868                         }
 869                 }
 870                 if (!dirent->inode)
 871                         goto next;
 872
 873                 /*
 874                  * Make sure the inode listed is a legal one.
 875                  */
 876                 if (((dirent->inode != EXT2_ROOT_INO) &&
 877                      (dirent->inode < EXT2_FIRST_INODE(fs->super))) ||
 878                     (dirent->inode > fs->super->s_inodes_count)) {
 879                         problem = PR_2_BAD_INO;
 880                 } else if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map,
 881                                                dirent->inode))) {
 882                         /*
 883                          * If the inode is unused, offer to clear it.
 884                          */
 885                         problem = PR_2_UNUSED_INODE;
 886                 } else if (ctx->inode_bb_map &&
 887                            (ext2fs_test_inode_bitmap(ctx->inode_bb_map,
 888                                                      dirent->inode))) {
 889                         /*
 890                          * If the inode is in a bad block, offer to
 891                          * clear it.
 892                          */
 893                         problem = PR_2_BB_INODE;
 894                 } else if ((dot_state > 1) &&
 895                            ((dirent->name_len & 0xFF) == 1) &&
 896                            (dirent->name[0] == '.')) {
 897                         /*
 898                          * If there's a '.' entry in anything other
 899                          * than the first directory entry, it's a
 900                          * duplicate entry that should be removed.
 901                          */
 902                         problem = PR_2_DUP_DOT;
 903                 } else if ((dot_state > 1) &&
 904                            ((dirent->name_len & 0xFF) == 2) &&
 905                            (dirent->name[0] == '.') &&
 906                            (dirent->name[1] == '.')) {
 907                         /*
 908                          * If there's a '..' entry in anything other
 909                          * than the second directory entry, it's a
 910                          * duplicate entry that should be removed.
 911                          */
 912                         problem = PR_2_DUP_DOT_DOT;
 913                 } else if ((dot_state > 1) &&
 914                            (dirent->inode == EXT2_ROOT_INO)) {
 915                         /*
 916                          * Don't allow links to the root directory.
 917                          * We check this specially to make sure we
 918                          * catch this error case even if the root
 919                          * directory hasn't been created yet.
 920                          */
 921                         problem = PR_2_LINK_ROOT;
 922                 } else if ((dot_state > 1) &&
 923                            (dirent->name_len & 0xFF) == 0) {
 924                         /*
 925                          * Don't allow zero-length directory names.
 926                          */
 927                         problem = PR_2_NULL_NAME;
 928                 }
 929
 930                 if (problem) {
 931                         if (fix_problem(ctx, problem, &cd->pctx)) {
 932                                 dirent->inode = 0;
 933                                 dir_modified++;
 934                                 goto next;
 935                         } else {
 936                                 ext2fs_unmark_valid(fs);
 937                                 if (problem == PR_2_BAD_INO)
 938                                         goto next;
 939                         }
 940                 }
 941
 942                 /*
 943                  * If the inode was marked as having bad fields in
 944                  * pass1, process it and offer to fix/clear it.
 945                  * (We wait until now so that we can display the
 946                  * pathname to the user.)
 947                  */
 948                 if (ctx->inode_bad_map &&
 949                     ext2fs_test_inode_bitmap(ctx->inode_bad_map,
 950                                              dirent->inode)) {
 951                         if (e2fsck_process_bad_inode(ctx, ino,
 952                                                      dirent->inode,
 953                                                      buf + fs->blocksize)) {
 954                                 dirent->inode = 0;
 955                                 dir_modified++;
 956                                 goto next;
 957                         }
 958                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 959                                 return DIRENT_ABORT;
 960                 }
 961
 962                 if (check_name(ctx, dirent, ino, &cd->pctx))
 963                         dir_modified++;
 964
 965                 if (check_filetype(ctx, dirent, ino, &cd->pctx))
 966                         dir_modified++;
 967
 968 #ifdef ENABLE_HTREE
 969                 if (dx_db) {
 970                         ext2fs_dirhash(dx_dir->hashversion, dirent->name,
 971                                        (dirent->name_len & 0xFF),
 972                                        fs->super->s_hash_seed, &hash, 0);
 973                         if (hash < dx_db->min_hash)
 974                                 dx_db->min_hash = hash;
 975                         if (hash > dx_db->max_hash)
 976                                 dx_db->max_hash = hash;
 977                 }
 978 #endif
 979
 980                 /*
 981                  * If this is a directory, then mark its parent in its
 982                  * dir_info structure.  If the parent field is already
 983                  * filled in, then this directory has more than one
 984                  * hard link.  We assume the first link is correct,
 985                  * and ask the user if he/she wants to clear this one.
 986                  */
 987                 if ((dot_state > 1) &&
 988                     (ext2fs_test_inode_bitmap(ctx->inode_dir_map,
 989                                               dirent->inode))) {
 990                         if (e2fsck_dir_info_get_parent(ctx, dirent->inode,
 991                                                        &subdir_parent)) {
 992                                 cd->pctx.ino = dirent->inode;
 993                                 fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
 994                                 goto abort_free_dict;
 995                         }
 996                         if (subdir_parent) {
 997                                 cd->pctx.ino2 = subdir_parent;
 998                                 if (fix_problem(ctx, PR_2_LINK_DIR,
 999                                                 &cd->pctx)) {
1000                                         dirent->inode = 0;
1001                                         dir_modified++;
1002                                         goto next;
1003                                 }
1004                                 cd->pctx.ino2 = 0;
1005                         } else {
1006                                 (void) e2fsck_dir_info_set_parent(ctx,
1007                                                   dirent->inode, ino);
1008                         }
1009                 }
1010
1011                 if (dups_found) {
1012                         ;
1013                 } else if (dict_lookup(&de_dict, dirent)) {
1014                         clear_problem_context(&pctx);
1015                         pctx.ino = ino;
1016                         pctx.dirent = dirent;
1017                         fix_problem(ctx, PR_2_REPORT_DUP_DIRENT, &pctx);
1018                         if (!ctx->dirs_to_hash)
1019                                 ext2fs_u32_list_create(&ctx->dirs_to_hash, 50);
1020                         if (ctx->dirs_to_hash)
1021                                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1022                         dups_found++;
1023                 } else
1024                         dict_alloc_insert(&de_dict, dirent, dirent);
1025
1026                 ext2fs_icount_increment(ctx->inode_count, dirent->inode,
1027                                         &links);
1028                 if (links > 1)
1029                         ctx->fs_links_count++;
1030                 ctx->fs_total_count++;
1031         next:
1032                 prev = dirent;
1033                 offset += dirent->rec_len;
1034                 dot_state++;
1035         } while (offset < fs->blocksize);
1036 #if 0
1037         printf("\n");
1038 #endif
1039 #ifdef ENABLE_HTREE
1040         if (dx_db) {
1041 #ifdef DX_DEBUG
1042                 printf("db_block %d, type %d, min_hash 0x%0x, max_hash 0x%0x\n",
1043                        db->blockcnt, dx_db->type,
1044                        dx_db->min_hash, dx_db->max_hash);
1045 #endif
1046                 cd->pctx.dir = cd->pctx.ino;
1047                 if ((dx_db->type == DX_DIRBLOCK_ROOT) ||
1048                     (dx_db->type == DX_DIRBLOCK_NODE))
1049                         parse_int_node(fs, db, cd, dx_dir, buf);
1050         }
1051 #endif /* ENABLE_HTREE */
1052         if (offset != fs->blocksize) {
1053                 cd->pctx.num = dirent->rec_len - fs->blocksize + offset;
1054                 if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
1055                         dirent->rec_len = cd->pctx.num;
1056                         dir_modified++;
1057                 }
1058         }
1059         if (dir_modified) {
1060                 cd->pctx.errcode = ext2fs_write_dir_block(fs, block_nr, buf);
1061                 if (cd->pctx.errcode) {
1062                         if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
1063                                          &cd->pctx))
1064                                 goto abort_free_dict;
1065                 }
1066                 ext2fs_mark_changed(fs);
1067         }
1068         dict_free_nodes(&de_dict);
1069         return 0;
1070 abort_free_dict:
1071         dict_free_nodes(&de_dict);
1072         ctx->flags |= E2F_FLAG_ABORT;
1073         return DIRENT_ABORT;
1074 }
1075
1076 /*
1077  * This function is called to deallocate a block, and is an interator
1078  * functioned called by deallocate inode via ext2fs_iterate_block().
1079  */
1080 static int deallocate_inode_block(ext2_filsys fs,
1081                                   blk_t *block_nr,
1082                                   e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
1083                                   blk_t ref_block EXT2FS_ATTR((unused)),
1084                                   int ref_offset EXT2FS_ATTR((unused)),
1085                                   void *priv_data)
1086 {
1087         e2fsck_t        ctx = (e2fsck_t) priv_data;
1088
1089         if (HOLE_BLKADDR(*block_nr))
1090                 return 0;
1091         if ((*block_nr < fs->super->s_first_data_block) ||
1092             (*block_nr >= fs->super->s_blocks_count))
1093                 return 0;
1094         ext2fs_unmark_block_bitmap(ctx->block_found_map, *block_nr);
1095         ext2fs_block_alloc_stats(fs, *block_nr, -1);
1096         return 0;
1097 }
1098
1099 /*
1100  * This fuction deallocates an inode
1101  */
1102 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
1103 {
1104         ext2_filsys fs = ctx->fs;
1105         struct ext2_inode       inode;
1106         struct problem_context  pctx;
1107         __u32                   count;
1108
1109         ext2fs_icount_store(ctx->inode_link_info, ino, 0);
1110         e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
1111         inode.i_links_count = 0;
1112         inode.i_dtime = ctx->now;
1113         e2fsck_write_inode(ctx, ino, &inode, "deallocate_inode");
1114         clear_problem_context(&pctx);
1115         pctx.ino = ino;
1116
1117         /*
1118          * Fix up the bitmaps...
1119          */
1120         e2fsck_read_bitmaps(ctx);
1121         ext2fs_unmark_inode_bitmap(ctx->inode_used_map, ino);
1122         ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, ino);
1123         if (ctx->inode_bad_map)
1124                 ext2fs_unmark_inode_bitmap(ctx->inode_bad_map, ino);
1125         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode));
1126
1127         if (inode.i_file_acl &&
1128             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1129                 pctx.errcode = ext2fs_adjust_ea_refcount(fs, inode.i_file_acl,
1130                                                    block_buf, -1, &count);
1131                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
1132                         pctx.errcode = 0;
1133                         count = 1;
1134                 }
1135                 if (pctx.errcode) {
1136                         pctx.blk = inode.i_file_acl;
1137                         fix_problem(ctx, PR_2_ADJ_EA_REFCOUNT, &pctx);
1138                         ctx->flags |= E2F_FLAG_ABORT;
1139                         return;
1140                 }
1141                 if (count == 0) {
1142                         ext2fs_unmark_block_bitmap(ctx->block_found_map,
1143                                                    inode.i_file_acl);
1144                         ext2fs_block_alloc_stats(fs, inode.i_file_acl, -1);
1145                 }
1146                 inode.i_file_acl = 0;
1147         }
1148
1149         if (!ext2fs_inode_has_valid_blocks(&inode))
1150                 return;
1151
1152         if (LINUX_S_ISREG(inode.i_mode) &&
1153             (inode.i_size_high || inode.i_size & 0x80000000UL))
1154                 ctx->large_files--;
1155
1156         pctx.errcode = ext2fs_block_iterate2(fs, ino, 0, block_buf,
1157                                             deallocate_inode_block, ctx);
1158         if (pctx.errcode) {
1159                 fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
1160                 ctx->flags |= E2F_FLAG_ABORT;
1161                 return;
1162         }
1163 }
1164
1165 /*
1166  * This fuction clears the htree flag on an inode
1167  */
1168 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino)
1169 {
1170         struct ext2_inode       inode;
1171
1172         e2fsck_read_inode(ctx, ino, &inode, "clear_htree");
1173         inode.i_flags = inode.i_flags & ~EXT2_INDEX_FL;
1174         e2fsck_write_inode(ctx, ino, &inode, "clear_htree");
1175         if (ctx->dirs_to_hash)
1176                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1177 }
1178
1179
1180 extern int e2fsck_process_bad_inode(e2fsck_t ctx, ext2_ino_t dir,
1181                                     ext2_ino_t ino, char *buf)
1182 {
1183         ext2_filsys fs = ctx->fs;
1184         struct ext2_inode       inode;
1185         int                     inode_modified = 0;
1186         int                     not_fixed = 0;
1187         unsigned char           *frag, *fsize;
1188         struct problem_context  pctx;
1189         int     problem = 0;
1190
1191         e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");
1192
1193         clear_problem_context(&pctx);
1194         pctx.ino = ino;
1195         pctx.dir = dir;
1196         pctx.inode = &inode;
1197
1198         if (inode.i_file_acl &&
1199             !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1200                 if (fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
1201                         inode.i_file_acl = 0;
1202 #ifdef EXT2FS_ENABLE_SWAPFS
1203                         /*
1204                          * This is a special kludge to deal with long
1205                          * symlinks on big endian systems.  i_blocks
1206                          * had already been decremented earlier in
1207                          * pass 1, but since i_file_acl hadn't yet
1208                          * been cleared, ext2fs_read_inode() assumed
1209                          * that the file was short symlink and would
1210                          * not have byte swapped i_block[0].  Hence,
1211                          * we have to byte-swap it here.
1212                          */
1213                         if (LINUX_S_ISLNK(inode.i_mode) &&
1214                             (fs->flags & EXT2_FLAG_SWAP_BYTES) &&
1215                             (inode.i_blocks == fs->blocksize >> 9))
1216                                 inode.i_block[0] = ext2fs_swab32(inode.i_block[0]);
1217 #endif
1218                         inode_modified++;
1219                 } else
1220                         not_fixed++;
1221         }
1222
1223         if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) &&
1224             !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) &&
1225             !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) &&
1226             !(LINUX_S_ISSOCK(inode.i_mode)))
1227                 problem = PR_2_BAD_MODE;
1228         else if (LINUX_S_ISCHR(inode.i_mode)
1229                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1230                 problem = PR_2_BAD_CHAR_DEV;
1231         else if (LINUX_S_ISBLK(inode.i_mode)
1232                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1233                 problem = PR_2_BAD_BLOCK_DEV;
1234         else if (LINUX_S_ISFIFO(inode.i_mode)
1235                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1236                 problem = PR_2_BAD_FIFO;
1237         else if (LINUX_S_ISSOCK(inode.i_mode)
1238                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1239                 problem = PR_2_BAD_SOCKET;
1240         else if (LINUX_S_ISLNK(inode.i_mode)
1241                  && !e2fsck_pass1_check_symlink(fs, &inode, buf)) {
1242                 problem = PR_2_INVALID_SYMLINK;
1243         }
1244
1245         if (problem) {
1246                 if (fix_problem(ctx, problem, &pctx)) {
1247                         deallocate_inode(ctx, ino, 0);
1248                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
1249                                 return 0;
1250                         return 1;
1251                 } else
1252                         not_fixed++;
1253                 problem = 0;
1254         }
1255
1256         if (inode.i_faddr) {
1257                 if (fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
1258                         inode.i_faddr = 0;
1259                         inode_modified++;
1260                 } else
1261                         not_fixed++;
1262         }
1263
1264         switch (fs->super->s_creator_os) {
1265             case EXT2_OS_HURD:
1266                 frag = &inode.osd2.hurd2.h_i_frag;
1267                 fsize = &inode.osd2.hurd2.h_i_fsize;
1268                 break;
1269             case EXT2_OS_MASIX:
1270                 frag = &inode.osd2.masix2.m_i_frag;
1271                 fsize = &inode.osd2.masix2.m_i_fsize;
1272                 break;
1273             default:
1274                 frag = fsize = 0;
1275         }
1276         if (frag && *frag) {
1277                 pctx.num = *frag;
1278                 if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
1279                         *frag = 0;
1280                         inode_modified++;
1281                 } else
1282                         not_fixed++;
1283                 pctx.num = 0;
1284         }
1285         if (fsize && *fsize) {
1286                 pctx.num = *fsize;
1287                 if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
1288                         *fsize = 0;
1289                         inode_modified++;
1290                 } else
1291                         not_fixed++;
1292                 pctx.num = 0;
1293         }
1294
1295         if ((fs->super->s_creator_os == EXT2_OS_LINUX) &&
1296             !(fs->super->s_feature_ro_compat &
1297               EXT4_FEATURE_RO_COMPAT_HUGE_FILE) &&
1298             (inode.osd2.linux2.l_i_blocks_hi != 0)) {
1299                 pctx.num = inode.osd2.linux2.l_i_blocks_hi;
1300                 if (fix_problem(ctx, PR_2_BLOCKS_HI_ZERO, &pctx)) {
1301                         inode.osd2.linux2.l_i_blocks_hi = 0;
1302                         inode_modified++;
1303                 }
1304         }
1305
1306         if (inode.i_file_acl &&
1307             ((inode.i_file_acl < fs->super->s_first_data_block) ||
1308              (inode.i_file_acl >= fs->super->s_blocks_count))) {
1309                 if (fix_problem(ctx, PR_2_FILE_ACL_BAD, &pctx)) {
1310                         inode.i_file_acl = 0;
1311                         inode_modified++;
1312                 } else
1313                         not_fixed++;
1314         }
1315         if (inode.i_dir_acl &&
1316             LINUX_S_ISDIR(inode.i_mode)) {
1317                 if (fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
1318                         inode.i_dir_acl = 0;
1319                         inode_modified++;
1320                 } else
1321                         not_fixed++;
1322         }
1323
1324         if (inode_modified)
1325                 e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
1326         if (!not_fixed && ctx->inode_bad_map)
1327                 ext2fs_unmark_inode_bitmap(ctx->inode_bad_map, ino);
1328         return 0;
1329 }
1330
1331
1332 /*
1333  * allocate_dir_block --- this function allocates a new directory
1334  *      block for a particular inode; this is done if a directory has
1335  *      a "hole" in it, or if a directory has a illegal block number
1336  *      that was zeroed out and now needs to be replaced.
1337  */
1338 static int allocate_dir_block(e2fsck_t ctx,
1339                               struct ext2_db_entry *db,
1340                               char *buf EXT2FS_ATTR((unused)),
1341                               struct problem_context *pctx)
1342 {
1343         ext2_filsys fs = ctx->fs;
1344         blk_t                   blk;
1345         char                    *block;
1346         struct ext2_inode       inode;
1347
1348         if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
1349                 return 1;
1350
1351         /*
1352          * Read the inode and block bitmaps in; we'll be messing with
1353          * them.
1354          */
1355         e2fsck_read_bitmaps(ctx);
1356
1357         /*
1358          * First, find a free block
1359          */
1360         pctx->errcode = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk);
1361         if (pctx->errcode) {
1362                 pctx->str = "ext2fs_new_block";
1363                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1364                 return 1;
1365         }
1366         ext2fs_mark_block_bitmap(ctx->block_found_map, blk);
1367         ext2fs_mark_block_bitmap(fs->block_map, blk);
1368         ext2fs_mark_bb_dirty(fs);
1369
1370         /*
1371          * Now let's create the actual data block for the inode
1372          */
1373         if (db->blockcnt)
1374                 pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
1375         else
1376                 pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
1377                                                      EXT2_ROOT_INO, &block);
1378
1379         if (pctx->errcode) {
1380                 pctx->str = "ext2fs_new_dir_block";
1381                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1382                 return 1;
1383         }
1384
1385         pctx->errcode = ext2fs_write_dir_block(fs, blk, block);
1386         ext2fs_free_mem(&block);
1387         if (pctx->errcode) {
1388                 pctx->str = "ext2fs_write_dir_block";
1389                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1390                 return 1;
1391         }
1392
1393         /*
1394          * Update the inode block count
1395          */
1396         e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
1397         inode.i_blocks += fs->blocksize / 512;
1398         if (inode.i_size < (db->blockcnt+1) * fs->blocksize)
1399                 inode.i_size = (db->blockcnt+1) * fs->blocksize;
1400         e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");
1401
1402         /*
1403          * Finally, update the block pointers for the inode
1404          */
1405         db->blk = blk;
1406         pctx->errcode = ext2fs_block_iterate2(fs, db->ino, BLOCK_FLAG_HOLE,
1407                                       0, update_dir_block, db);
1408         if (pctx->errcode) {
1409                 pctx->str = "ext2fs_block_iterate";
1410                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1411                 return 1;
1412         }
1413
1414         return 0;
1415 }
1416
1417 /*
1418  * This is a helper function for allocate_dir_block().
1419  */
1420 static int update_dir_block(ext2_filsys fs EXT2FS_ATTR((unused)),
1421                             blk_t       *block_nr,
1422                             e2_blkcnt_t blockcnt,
1423                             blk_t ref_block EXT2FS_ATTR((unused)),
1424                             int ref_offset EXT2FS_ATTR((unused)),
1425                             void *priv_data)
1426 {
1427         struct ext2_db_entry *db;
1428
1429         db = (struct ext2_db_entry *) priv_data;
1430         if (db->blockcnt == (int) blockcnt) {
1431                 *block_nr = db->blk;
1432                 return BLOCK_CHANGED;
1433         }
1434         return 0;
1435 }