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 = de_a->name_len & 0xFF;
 306         de_b = (const struct ext2_dir_entry *) b;
 307         b_len = de_b->name_len & 0xFF;
 308
 309         if (a_len != b_len)
 310                 return (a_len - b_len);
 311
 312         return strncmp(de_a->name, de_b->name, a_len);
 313 }
 314
 315 /*
 316  * This is special sort function that makes sure that directory blocks
 317  * with a dirblock of zero are sorted to the beginning of the list.
 318  * This guarantees that the root node of the htree directories are
 319  * processed first, so we know what hash version to use.
 320  */
 321 static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b)
 322 {
 323         const struct ext2_db_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 (((dirent->name_len & 0xFF) != 1) ||
 361                  (dirent->name[0] != '.'))
 362                 problem = PR_2_1ST_NOT_DOT;
 363         else if (dirent->name[1] != '\0')
 364                 problem = PR_2_DOT_NULL_TERM;
 365
 366         (void) ext2fs_get_rec_len(ctx->fs, dirent, &rec_len);
 367         if (problem) {
 368                 if (fix_problem(ctx, problem, pctx)) {
 369                         if (rec_len < 12)
 370                                 rec_len = dirent->rec_len = 12;
 371                         dirent->inode = ino;
 372                         dirent->name_len = 1;
 373                         dirent->name[0] = '.';
 374                         dirent->name[1] = '\0';
 375                         status = 1;
 376                         created = 1;
 377                 }
 378         }
 379         if (dirent->inode != ino) {
 380                 if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
 381                         dirent->inode = ino;
 382                         status = 1;
 383                 }
 384         }
 385         if (rec_len > 12) {
 386                 new_len = rec_len - 12;
 387                 if (new_len > 12) {
 388                         if (created ||
 389                             fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
 390                                 nextdir = (struct ext2_dir_entry *)
 391                                         ((char *) dirent + 12);
 392                                 dirent->rec_len = 12;
 393                                 (void) ext2fs_set_rec_len(ctx->fs, new_len,
 394                                                           nextdir);
 395                                 nextdir->inode = 0;
 396                                 nextdir->name_len = 0;
 397                                 status = 1;
 398                         }
 399                 }
 400         }
 401         return status;
 402 }
 403
 404 /*
 405  * Make sure the second entry in the directory is '..', and that the
 406  * directory entry is sane.  We do not check the inode number of '..'
 407  * here; this gets done in pass 3.
 408  */
 409 static int check_dotdot(e2fsck_t ctx,
 410                         struct ext2_dir_entry *dirent,
 411                         ext2_ino_t ino, struct problem_context *pctx)
 412 {
 413         problem_t       problem = 0;
 414         unsigned int    rec_len;
 415
 416         if (!dirent->inode)
 417                 problem = PR_2_MISSING_DOT_DOT;
 418         else if (((dirent->name_len & 0xFF) != 2) ||
 419                  (dirent->name[0] != '.') ||
 420                  (dirent->name[1] != '.'))
 421                 problem = PR_2_2ND_NOT_DOT_DOT;
 422         else if (dirent->name[2] != '\0')
 423                 problem = PR_2_DOT_DOT_NULL_TERM;
 424
 425         (void) ext2fs_get_rec_len(ctx->fs, dirent, &rec_len);
 426         if (problem) {
 427                 if (fix_problem(ctx, problem, pctx)) {
 428                         if (rec_len < 12)
 429                                 dirent->rec_len = 12;
 430                         /*
 431                          * Note: we don't have the parent inode just
 432                          * yet, so we will fill it in with the root
 433                          * inode.  This will get fixed in pass 3.
 434                          */
 435                         dirent->inode = EXT2_ROOT_INO;
 436                         dirent->name_len = 2;
 437                         dirent->name[0] = '.';
 438                         dirent->name[1] = '.';
 439                         dirent->name[2] = '\0';
 440                         return 1;
 441                 }
 442                 return 0;
 443         }
 444         if (e2fsck_dir_info_set_dotdot(ctx, ino, dirent->inode)) {
 445                 fix_problem(ctx, PR_2_NO_DIRINFO, pctx);
 446                 return -1;
 447         }
 448         return 0;
 449 }
 450
 451 /*
 452  * Check to make sure a directory entry doesn't contain any illegal
 453  * characters.
 454  */
 455 static int check_name(e2fsck_t ctx,
 456                       struct ext2_dir_entry *dirent,
 457                       ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 458                       struct problem_context *pctx)
 459 {
 460         int     i;
 461         int     fixup = -1;
 462         int     ret = 0;
 463
 464         for ( i = 0; i < (dirent->name_len & 0xFF); i++) {
 465                 if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
 466                         if (fixup < 0) {
 467                                 fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
 468                         }
 469                         if (fixup) {
 470                                 dirent->name[i] = '.';
 471                                 ret = 1;
 472                         }
 473                 }
 474         }
 475         return ret;
 476 }
 477
 478 /*
 479  * Check the directory filetype (if present)
 480  */
 481 static _INLINE_ int check_filetype(e2fsck_t ctx,
 482                                    struct ext2_dir_entry *dirent,
 483                                    ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
 484                                    struct problem_context *pctx)
 485 {
 486         int     filetype = dirent->name_len >> 8;
 487         int     should_be = EXT2_FT_UNKNOWN;
 488         struct ext2_inode       inode;
 489
 490         if (!(ctx->fs->super->s_feature_incompat &
 491               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 492                 if (filetype == 0 ||
 493                     !fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
 494                         return 0;
 495                 dirent->name_len = dirent->name_len & 0xFF;
 496                 return 1;
 497         }
 498
 499         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dirent->inode)) {
 500                 should_be = EXT2_FT_DIR;
 501         } else if (ext2fs_test_inode_bitmap2(ctx->inode_reg_map,
 502                                             dirent->inode)) {
 503                 should_be = EXT2_FT_REG_FILE;
 504         } else if (ctx->inode_bad_map &&
 505                    ext2fs_test_inode_bitmap2(ctx->inode_bad_map,
 506                                             dirent->inode))
 507                 should_be = 0;
 508         else {
 509                 e2fsck_read_inode(ctx, dirent->inode, &inode,
 510                                   "check_filetype");
 511                 should_be = ext2_file_type(inode.i_mode);
 512         }
 513         if (filetype == should_be)
 514                 return 0;
 515         pctx->num = should_be;
 516
 517         if (fix_problem(ctx, filetype ? PR_2_BAD_FILETYPE : PR_2_SET_FILETYPE,
 518                         pctx) == 0)
 519                 return 0;
 520
 521         dirent->name_len = (dirent->name_len & 0xFF) | should_be << 8;
 522         return 1;
 523 }
 524
 525 #ifdef ENABLE_HTREE
 526 static void parse_int_node(ext2_filsys fs,
 527                            struct ext2_db_entry2 *db,
 528                            struct check_dir_struct *cd,
 529                            struct dx_dir_info   *dx_dir,
 530                            char *block_buf)
 531 {
 532         struct          ext2_dx_root_info  *root;
 533         struct          ext2_dx_entry *ent;
 534         struct          ext2_dx_countlimit *limit;
 535         struct dx_dirblock_info *dx_db;
 536         int             i, expect_limit, count;
 537         blk_t           blk;
 538         ext2_dirhash_t  min_hash = 0xffffffff;
 539         ext2_dirhash_t  max_hash = 0;
 540         ext2_dirhash_t  hash = 0, prev_hash;
 541
 542         if (db->blockcnt == 0) {
 543                 root = (struct ext2_dx_root_info *) (block_buf + 24);
 544
 545 #ifdef DX_DEBUG
 546                 printf("Root node dump:\n");
 547                 printf("\t Reserved zero: %u\n", root->reserved_zero);
 548                 printf("\t Hash Version: %d\n", root->hash_version);
 549                 printf("\t Info length: %d\n", root->info_length);
 550                 printf("\t Indirect levels: %d\n", root->indirect_levels);
 551                 printf("\t Flags: %d\n", root->unused_flags);
 552 #endif
 553
 554                 ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length);
 555         } else {
 556                 ent = (struct ext2_dx_entry *) (block_buf+8);
 557         }
 558         limit = (struct ext2_dx_countlimit *) ent;
 559
 560 #ifdef DX_DEBUG
 561         printf("Number of entries (count): %d\n",
 562                ext2fs_le16_to_cpu(limit->count));
 563         printf("Number of entries (limit): %d\n",
 564                ext2fs_le16_to_cpu(limit->limit));
 565 #endif
 566
 567         count = ext2fs_le16_to_cpu(limit->count);
 568         expect_limit = (fs->blocksize - ((char *) ent - block_buf)) /
 569                 sizeof(struct ext2_dx_entry);
 570         if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
 571                 cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
 572                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
 573                         goto clear_and_exit;
 574         }
 575         if (count > expect_limit) {
 576                 cd->pctx.num = count;
 577                 if (fix_problem(cd->ctx, PR_2_HTREE_BAD_COUNT, &cd->pctx))
 578                         goto clear_and_exit;
 579                 count = expect_limit;
 580         }
 581
 582         for (i=0; i < count; i++) {
 583                 prev_hash = hash;
 584                 hash = i ? (ext2fs_le32_to_cpu(ent[i].hash) & ~1) : 0;
 585 #ifdef DX_DEBUG
 586                 printf("Entry #%d: Hash 0x%08x, block %u\n", i,
 587                        hash, ext2fs_le32_to_cpu(ent[i].block));
 588 #endif
 589                 blk = ext2fs_le32_to_cpu(ent[i].block) & 0x0ffffff;
 590                 /* Check to make sure the block is valid */
 591                 if (blk >= (blk_t) dx_dir->numblocks) {
 592                         cd->pctx.blk = blk;
 593                         if (fix_problem(cd->ctx, PR_2_HTREE_BADBLK,
 594                                         &cd->pctx))
 595                                 goto clear_and_exit;
 596                         continue;
 597                 }
 598                 if (hash < prev_hash &&
 599                     fix_problem(cd->ctx, PR_2_HTREE_HASH_ORDER, &cd->pctx))
 600                         goto clear_and_exit;
 601                 dx_db = &dx_dir->dx_block[blk];
 602                 if (dx_db->flags & DX_FLAG_REFERENCED) {
 603                         dx_db->flags |= DX_FLAG_DUP_REF;
 604                 } else {
 605                         dx_db->flags |= DX_FLAG_REFERENCED;
 606                         dx_db->parent = db->blockcnt;
 607                 }
 608                 if (hash < min_hash)
 609                         min_hash = hash;
 610                 if (hash > max_hash)
 611                         max_hash = hash;
 612                 dx_db->node_min_hash = hash;
 613                 if ((i+1) < count)
 614                         dx_db->node_max_hash =
 615                           ext2fs_le32_to_cpu(ent[i+1].hash) & ~1;
 616                 else {
 617                         dx_db->node_max_hash = 0xfffffffe;
 618                         dx_db->flags |= DX_FLAG_LAST;
 619                 }
 620                 if (i == 0)
 621                         dx_db->flags |= DX_FLAG_FIRST;
 622         }
 623 #ifdef DX_DEBUG
 624         printf("Blockcnt = %d, min hash 0x%08x, max hash 0x%08x\n",
 625                db->blockcnt, min_hash, max_hash);
 626 #endif
 627         dx_db = &dx_dir->dx_block[db->blockcnt];
 628         dx_db->min_hash = min_hash;
 629         dx_db->max_hash = max_hash;
 630         return;
 631
 632 clear_and_exit:
 633         clear_htree(cd->ctx, cd->pctx.ino);
 634         dx_dir->numblocks = 0;
 635 }
 636 #endif /* ENABLE_HTREE */
 637
 638 /*
 639  * Given a busted directory, try to salvage it somehow.
 640  *
 641  */
 642 static void salvage_directory(ext2_filsys fs,
 643                               struct ext2_dir_entry *dirent,
 644                               struct ext2_dir_entry *prev,
 645                               unsigned int *offset)
 646 {
 647         char    *cp = (char *) dirent;
 648         int left;
 649         unsigned int rec_len, prev_rec_len;
 650         unsigned int name_len = dirent->name_len & 0xFF;
 651
 652         (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 653         left = fs->blocksize - *offset - rec_len;
 654
 655         /*
 656          * Special case of directory entry of size 8: copy what's left
 657          * of the directory block up to cover up the invalid hole.
 658          */
 659         if ((left >= 12) && (rec_len == 8)) {
 660                 memmove(cp, cp+8, left);
 661                 memset(cp + left, 0, 8);
 662                 return;
 663         }
 664         /*
 665          * If the directory entry overruns the end of the directory
 666          * block, and the name is small enough to fit, then adjust the
 667          * record length.
 668          */
 669         if ((left < 0) &&
 670             ((int) rec_len + left > 8) &&
 671             ((int) name_len + 8 <= (int) rec_len + left) &&
 672             dirent->inode <= fs->super->s_inodes_count &&
 673             strnlen(dirent->name, name_len) == name_len) {
 674                 (void) ext2fs_set_rec_len(fs, (int) rec_len + left, dirent);
 675                 return;
 676         }
 677         /*
 678          * If the record length of the directory entry is a multiple
 679          * of four, and not too big, such that it is valid, let the
 680          * previous directory entry absorb the invalid one.
 681          */
 682         if (prev && rec_len && (rec_len % 4) == 0 &&
 683             (*offset + rec_len <= fs->blocksize)) {
 684                 (void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
 685                 prev_rec_len += rec_len;
 686                 (void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
 687                 *offset += rec_len;
 688                 return;
 689         }
 690         /*
 691          * Default salvage method --- kill all of the directory
 692          * entries for the rest of the block.  We will either try to
 693          * absorb it into the previous directory entry, or create a
 694          * new empty directory entry the rest of the directory block.
 695          */
 696         if (prev) {
 697                 (void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
 698                 prev_rec_len += fs->blocksize - *offset;
 699                 (void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
 700                 *offset = fs->blocksize;
 701         } else {
 702                 rec_len = fs->blocksize - *offset;
 703                 (void) ext2fs_set_rec_len(fs, rec_len, dirent);
 704                 dirent->name_len = 0;
 705                 dirent->inode = 0;
 706         }
 707 }
 708
 709 static int check_dir_block(ext2_filsys fs,
 710                            struct ext2_db_entry2 *db,
 711                            void *priv_data)
 712 {
 713         struct dx_dir_info      *dx_dir;
 714 #ifdef ENABLE_HTREE
 715         struct dx_dirblock_info *dx_db = 0;
 716 #endif /* ENABLE_HTREE */
 717         struct ext2_dir_entry   *dirent, *prev;
 718         ext2_dirhash_t          hash;
 719         unsigned int            offset = 0;
 720         int                     dir_modified = 0;
 721         int                     dot_state;
 722         unsigned int            rec_len;
 723         blk64_t                 block_nr = db->blk;
 724         ext2_ino_t              ino = db->ino;
 725         ext2_ino_t              subdir_parent;
 726         __u16                   links;
 727         struct check_dir_struct *cd;
 728         char                    *buf;
 729         e2fsck_t                ctx;
 730         problem_t               problem;
 731         struct ext2_dx_root_info *root;
 732         struct ext2_dx_countlimit *limit;
 733         static dict_t de_dict;
 734         struct problem_context  pctx;
 735         int     dups_found = 0;
 736         int     ret;
 737
 738         cd = (struct check_dir_struct *) priv_data;
 739         buf = cd->buf;
 740         ctx = cd->ctx;
 741
 742         if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
 743                 return DIRENT_ABORT;
 744
 745         if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
 746                 return DIRENT_ABORT;
 747
 748         /*
 749          * Make sure the inode is still in use (could have been
 750          * deleted in the duplicate/bad blocks pass.
 751          */
 752         if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, ino)))
 753                 return 0;
 754
 755         cd->pctx.ino = ino;
 756         cd->pctx.blk = block_nr;
 757         cd->pctx.blkcount = db->blockcnt;
 758         cd->pctx.ino2 = 0;
 759         cd->pctx.dirent = 0;
 760         cd->pctx.num = 0;
 761
 762         if (db->blk == 0) {
 763                 if (allocate_dir_block(ctx, db, buf, &cd->pctx))
 764                         return 0;
 765                 block_nr = db->blk;
 766         }
 767
 768         if (db->blockcnt)
 769                 dot_state = 2;
 770         else
 771                 dot_state = 0;
 772
 773         if (ctx->dirs_to_hash &&
 774             ext2fs_u32_list_test(ctx->dirs_to_hash, ino))
 775                 dups_found++;
 776
 777 #if 0
 778         printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
 779                db->blockcnt, ino);
 780 #endif
 781
 782         ehandler_operation(_("reading directory block"));
 783         cd->pctx.errcode = ext2fs_read_dir_block3(fs, block_nr, buf, 0);
 784         ehandler_operation(0);
 785         if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
 786                 cd->pctx.errcode = 0; /* We'll handle this ourselves */
 787         if (cd->pctx.errcode) {
 788                 if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
 789                         ctx->flags |= E2F_FLAG_ABORT;
 790                         return DIRENT_ABORT;
 791                 }
 792                 memset(buf, 0, fs->blocksize);
 793         }
 794 #ifdef ENABLE_HTREE
 795         dx_dir = e2fsck_get_dx_dir_info(ctx, ino);
 796         if (dx_dir && dx_dir->numblocks) {
 797                 if (db->blockcnt >= dx_dir->numblocks) {
 798                         if (fix_problem(ctx, PR_2_UNEXPECTED_HTREE_BLOCK,
 799                                         &pctx)) {
 800                                 clear_htree(ctx, ino);
 801                                 dx_dir->numblocks = 0;
 802                                 dx_db = 0;
 803                                 goto out_htree;
 804                         }
 805                         fatal_error(ctx, _("Can not continue."));
 806                 }
 807                 dx_db = &dx_dir->dx_block[db->blockcnt];
 808                 dx_db->type = DX_DIRBLOCK_LEAF;
 809                 dx_db->phys = block_nr;
 810                 dx_db->min_hash = ~0;
 811                 dx_db->max_hash = 0;
 812
 813                 dirent = (struct ext2_dir_entry *) buf;
 814                 (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 815                 limit = (struct ext2_dx_countlimit *) (buf+8);
 816                 if (db->blockcnt == 0) {
 817                         root = (struct ext2_dx_root_info *) (buf + 24);
 818                         dx_db->type = DX_DIRBLOCK_ROOT;
 819                         dx_db->flags |= DX_FLAG_FIRST | DX_FLAG_LAST;
 820                         if ((root->reserved_zero ||
 821                              root->info_length < 8 ||
 822                              root->indirect_levels > 1) &&
 823                             fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
 824                                 clear_htree(ctx, ino);
 825                                 dx_dir->numblocks = 0;
 826                                 dx_db = 0;
 827                         }
 828                         dx_dir->hashversion = root->hash_version;
 829                         if ((dx_dir->hashversion <= EXT2_HASH_TEA) &&
 830                             (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
 831                                 dx_dir->hashversion += 3;
 832                         dx_dir->depth = root->indirect_levels + 1;
 833                 } else if ((dirent->inode == 0) &&
 834                            (rec_len == fs->blocksize) &&
 835                            (dirent->name_len == 0) &&
 836                            (ext2fs_le16_to_cpu(limit->limit) ==
 837                             ((fs->blocksize-8) /
 838                              sizeof(struct ext2_dx_entry))))
 839                         dx_db->type = DX_DIRBLOCK_NODE;
 840         }
 841 out_htree:
 842 #endif /* ENABLE_HTREE */
 843
 844         dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
 845         prev = 0;
 846         do {
 847                 dgrp_t group;
 848                 ext2_ino_t first_unused_inode;
 849
 850                 problem = 0;
 851                 dirent = (struct ext2_dir_entry *) (buf + offset);
 852                 (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
 853                 cd->pctx.dirent = dirent;
 854                 cd->pctx.num = offset;
 855                 if (((offset + rec_len) > fs->blocksize) ||
 856                     (rec_len < 12) ||
 857                     ((rec_len % 4) != 0) ||
 858                     (((dirent->name_len & (unsigned) 0xFF)+8) > rec_len)) {
 859                         if (fix_problem(ctx, PR_2_DIR_CORRUPTED, &cd->pctx)) {
 860                                 salvage_directory(fs, dirent, prev, &offset);
 861                                 dir_modified++;
 862                                 continue;
 863                         } else
 864                                 goto abort_free_dict;
 865                 }
 866
 867                 if (dot_state == 0) {
 868                         if (check_dot(ctx, dirent, ino, &cd->pctx))
 869                                 dir_modified++;
 870                 } else if (dot_state == 1) {
 871                         ret = check_dotdot(ctx, dirent, ino, &cd->pctx);
 872                         if (ret < 0)
 873                                 goto abort_free_dict;
 874                         if (ret)
 875                                 dir_modified++;
 876                 } else if (dirent->inode == ino) {
 877                         problem = PR_2_LINK_DOT;
 878                         if (fix_problem(ctx, PR_2_LINK_DOT, &cd->pctx)) {
 879                                 dirent->inode = 0;
 880                                 dir_modified++;
 881                                 goto next;
 882                         }
 883                 }
 884                 if (!dirent->inode)
 885                         goto next;
 886
 887                 /*
 888                  * Make sure the inode listed is a legal one.
 889                  */
 890                 if (((dirent->inode != EXT2_ROOT_INO) &&
 891                      (dirent->inode < EXT2_FIRST_INODE(fs->super))) ||
 892                     (dirent->inode > fs->super->s_inodes_count)) {
 893                         problem = PR_2_BAD_INO;
 894                 } else if (ctx->inode_bb_map &&
 895                            (ext2fs_test_inode_bitmap2(ctx->inode_bb_map,
 896                                                      dirent->inode))) {
 897                         /*
 898                          * If the inode is in a bad block, offer to
 899                          * clear it.
 900                          */
 901                         problem = PR_2_BB_INODE;
 902                 } else if ((dot_state > 1) &&
 903                            ((dirent->name_len & 0xFF) == 1) &&
 904                            (dirent->name[0] == '.')) {
 905                         /*
 906                          * If there's a '.' entry in anything other
 907                          * than the first directory entry, it's a
 908                          * duplicate entry that should be removed.
 909                          */
 910                         problem = PR_2_DUP_DOT;
 911                 } else if ((dot_state > 1) &&
 912                            ((dirent->name_len & 0xFF) == 2) &&
 913                            (dirent->name[0] == '.') &&
 914                            (dirent->name[1] == '.')) {
 915                         /*
 916                          * If there's a '..' entry in anything other
 917                          * than the second directory entry, it's a
 918                          * duplicate entry that should be removed.
 919                          */
 920                         problem = PR_2_DUP_DOT_DOT;
 921                 } else if ((dot_state > 1) &&
 922                            (dirent->inode == EXT2_ROOT_INO)) {
 923                         /*
 924                          * Don't allow links to the root directory.
 925                          * We check this specially to make sure we
 926                          * catch this error case even if the root
 927                          * directory hasn't been created yet.
 928                          */
 929                         problem = PR_2_LINK_ROOT;
 930                 } else if ((dot_state > 1) &&
 931                            (dirent->name_len & 0xFF) == 0) {
 932                         /*
 933                          * Don't allow zero-length directory names.
 934                          */
 935                         problem = PR_2_NULL_NAME;
 936                 }
 937
 938                 if (problem) {
 939                         if (fix_problem(ctx, problem, &cd->pctx)) {
 940                                 dirent->inode = 0;
 941                                 dir_modified++;
 942                                 goto next;
 943                         } else {
 944                                 ext2fs_unmark_valid(fs);
 945                                 if (problem == PR_2_BAD_INO)
 946                                         goto next;
 947                         }
 948                 }
 949
 950                 /*
 951                  * If the inode was marked as having bad fields in
 952                  * pass1, process it and offer to fix/clear it.
 953                  * (We wait until now so that we can display the
 954                  * pathname to the user.)
 955                  */
 956                 if (ctx->inode_bad_map &&
 957                     ext2fs_test_inode_bitmap2(ctx->inode_bad_map,
 958                                              dirent->inode)) {
 959                         if (e2fsck_process_bad_inode(ctx, ino,
 960                                                      dirent->inode,
 961                                                      buf + fs->blocksize)) {
 962                                 dirent->inode = 0;
 963                                 dir_modified++;
 964                                 goto next;
 965                         }
 966                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
 967                                 return DIRENT_ABORT;
 968                 }
 969
 970                 group = ext2fs_group_of_ino(fs, dirent->inode);
 971                 first_unused_inode = group * fs->super->s_inodes_per_group +
 972                                         1 + fs->super->s_inodes_per_group -
 973                                         ext2fs_bg_itable_unused(fs, group);
 974                 cd->pctx.group = group;
 975
 976                 /*
 977                  * Check if the inode was missed out because
 978                  * _INODE_UNINIT flag was set or bg_itable_unused was
 979                  * incorrect.  If so, clear the _INODE_UNINIT flag and
 980                  * restart e2fsck.  In the future it would be nice if
 981                  * we could call a function in pass1.c that checks the
 982                  * newly visible inodes.
 983                  */
 984                 if (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)) {
 985                         pctx.num = dirent->inode;
 986                         if (fix_problem(ctx, PR_2_INOREF_BG_INO_UNINIT,
 987                                         &cd->pctx)){
 988                                 ext2fs_bg_flags_clear(fs, group,
 989                                                       EXT2_BG_INODE_UNINIT);
 990                                 ext2fs_mark_super_dirty(fs);
 991                                 ctx->flags |= E2F_FLAG_RESTART_LATER;
 992                         } else {
 993                                 ext2fs_unmark_valid(fs);
 994                                 if (problem == PR_2_BAD_INO)
 995                                         goto next;
 996                         }
 997                 } else if (dirent->inode >= first_unused_inode) {
 998                         pctx.num = dirent->inode;
 999                         if (fix_problem(ctx, PR_2_INOREF_IN_UNUSED, &cd->pctx)){
1000                                 ext2fs_bg_itable_unused_set(fs, group, 0);
1001                                 ext2fs_mark_super_dirty(fs);
1002                                 ctx->flags |= E2F_FLAG_RESTART_LATER;
1003                         } else {
1004                                 ext2fs_unmark_valid(fs);
1005                                 if (problem == PR_2_BAD_INO)
1006                                         goto next;
1007                         }
1008                 }
1009
1010                 /*
1011                  * Offer to clear unused inodes; if we are going to be
1012                  * restarting the scan due to bg_itable_unused being
1013                  * wrong, then don't clear any inodes to avoid zapping
1014                  * inodes that were skipped during pass1 due to an
1015                  * incorrect bg_itable_unused; we'll get any real
1016                  * problems after we restart.
1017                  */
1018                 if (!(ctx->flags & E2F_FLAG_RESTART_LATER) &&
1019                     !(ext2fs_test_inode_bitmap2(ctx->inode_used_map,
1020                                                 dirent->inode)))
1021                         problem = PR_2_UNUSED_INODE;
1022
1023                 if (problem) {
1024                         if (fix_problem(ctx, problem, &cd->pctx)) {
1025                                 dirent->inode = 0;
1026                                 dir_modified++;
1027                                 goto next;
1028                         } else {
1029                                 ext2fs_unmark_valid(fs);
1030                                 if (problem == PR_2_BAD_INO)
1031                                         goto next;
1032                         }
1033                 }
1034
1035                 if (check_name(ctx, dirent, ino, &cd->pctx))
1036                         dir_modified++;
1037
1038                 if (check_filetype(ctx, dirent, ino, &cd->pctx))
1039                         dir_modified++;
1040
1041 #ifdef ENABLE_HTREE
1042                 if (dx_db) {
1043                         ext2fs_dirhash(dx_dir->hashversion, dirent->name,
1044                                        (dirent->name_len & 0xFF),
1045                                        fs->super->s_hash_seed, &hash, 0);
1046                         if (hash < dx_db->min_hash)
1047                                 dx_db->min_hash = hash;
1048                         if (hash > dx_db->max_hash)
1049                                 dx_db->max_hash = hash;
1050                 }
1051 #endif
1052
1053                 /*
1054                  * If this is a directory, then mark its parent in its
1055                  * dir_info structure.  If the parent field is already
1056                  * filled in, then this directory has more than one
1057                  * hard link.  We assume the first link is correct,
1058                  * and ask the user if he/she wants to clear this one.
1059                  */
1060                 if ((dot_state > 1) &&
1061                     (ext2fs_test_inode_bitmap2(ctx->inode_dir_map,
1062                                               dirent->inode))) {
1063                         if (e2fsck_dir_info_get_parent(ctx, dirent->inode,
1064                                                        &subdir_parent)) {
1065                                 cd->pctx.ino = dirent->inode;
1066                                 fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
1067                                 goto abort_free_dict;
1068                         }
1069                         if (subdir_parent) {
1070                                 cd->pctx.ino2 = subdir_parent;
1071                                 if (fix_problem(ctx, PR_2_LINK_DIR,
1072                                                 &cd->pctx)) {
1073                                         dirent->inode = 0;
1074                                         dir_modified++;
1075                                         goto next;
1076                                 }
1077                                 cd->pctx.ino2 = 0;
1078                         } else {
1079                                 (void) e2fsck_dir_info_set_parent(ctx,
1080                                                   dirent->inode, ino);
1081                         }
1082                 }
1083
1084                 if (dups_found) {
1085                         ;
1086                 } else if (dict_lookup(&de_dict, dirent)) {
1087                         clear_problem_context(&pctx);
1088                         pctx.ino = ino;
1089                         pctx.dirent = dirent;
1090                         fix_problem(ctx, PR_2_REPORT_DUP_DIRENT, &pctx);
1091                         if (!ctx->dirs_to_hash)
1092                                 ext2fs_u32_list_create(&ctx->dirs_to_hash, 50);
1093                         if (ctx->dirs_to_hash)
1094                                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1095                         dups_found++;
1096                 } else
1097                         dict_alloc_insert(&de_dict, dirent, dirent);
1098
1099                 ext2fs_icount_increment(ctx->inode_count, dirent->inode,
1100                                         &links);
1101                 if (links > 1)
1102                         ctx->fs_links_count++;
1103                 ctx->fs_total_count++;
1104         next:
1105                 prev = dirent;
1106                 if (dir_modified)
1107                         (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
1108                 offset += rec_len;
1109                 dot_state++;
1110         } while (offset < fs->blocksize);
1111 #if 0
1112         printf("\n");
1113 #endif
1114 #ifdef ENABLE_HTREE
1115         if (dx_db) {
1116 #ifdef DX_DEBUG
1117                 printf("db_block %d, type %d, min_hash 0x%0x, max_hash 0x%0x\n",
1118                        db->blockcnt, dx_db->type,
1119                        dx_db->min_hash, dx_db->max_hash);
1120 #endif
1121                 cd->pctx.dir = cd->pctx.ino;
1122                 if ((dx_db->type == DX_DIRBLOCK_ROOT) ||
1123                     (dx_db->type == DX_DIRBLOCK_NODE))
1124                         parse_int_node(fs, db, cd, dx_dir, buf);
1125         }
1126 #endif /* ENABLE_HTREE */
1127         if (offset != fs->blocksize) {
1128                 cd->pctx.num = rec_len - fs->blocksize + offset;
1129                 if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
1130                         dirent->rec_len = cd->pctx.num;
1131                         dir_modified++;
1132                 }
1133         }
1134         if (dir_modified) {
1135                 cd->pctx.errcode = ext2fs_write_dir_block3(fs, block_nr, buf, 0);
1136                 if (cd->pctx.errcode) {
1137                         if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
1138                                          &cd->pctx))
1139                                 goto abort_free_dict;
1140                 }
1141                 ext2fs_mark_changed(fs);
1142         }
1143         dict_free_nodes(&de_dict);
1144         return 0;
1145 abort_free_dict:
1146         ctx->flags |= E2F_FLAG_ABORT;
1147         dict_free_nodes(&de_dict);
1148         return DIRENT_ABORT;
1149 }
1150
1151 struct del_block {
1152         e2fsck_t        ctx;
1153         e2_blkcnt_t     num;
1154 };
1155
1156 /*
1157  * This function is called to deallocate a block, and is an interator
1158  * functioned called by deallocate inode via ext2fs_iterate_block().
1159  */
1160 static int deallocate_inode_block(ext2_filsys fs,
1161                                   blk64_t       *block_nr,
1162                                   e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
1163                                   blk64_t ref_block EXT2FS_ATTR((unused)),
1164                                   int ref_offset EXT2FS_ATTR((unused)),
1165                                   void *priv_data)
1166 {
1167         struct del_block *p = priv_data;
1168
1169         if (HOLE_BLKADDR(*block_nr))
1170                 return 0;
1171         if ((*block_nr < fs->super->s_first_data_block) ||
1172             (*block_nr >= ext2fs_blocks_count(fs->super)))
1173                 return 0;
1174         ext2fs_unmark_block_bitmap2(p->ctx->block_found_map, *block_nr);
1175         ext2fs_block_alloc_stats2(fs, *block_nr, -1);
1176         p->num++;
1177         return 0;
1178 }
1179
1180 /*
1181  * This fuction deallocates an inode
1182  */
1183 static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
1184 {
1185         ext2_filsys fs = ctx->fs;
1186         struct ext2_inode       inode;
1187         struct problem_context  pctx;
1188         __u32                   count;
1189         struct del_block        del_block;
1190
1191         e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
1192         clear_problem_context(&pctx);
1193         pctx.ino = ino;
1194
1195         /*
1196          * Fix up the bitmaps...
1197          */
1198         e2fsck_read_bitmaps(ctx);
1199         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode));
1200
1201         if (ext2fs_file_acl_block(fs, &inode) &&
1202             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1203                 pctx.errcode = ext2fs_adjust_ea_refcount2(fs,
1204                                         ext2fs_file_acl_block(fs, &inode),
1205                                         block_buf, -1, &count);
1206                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
1207                         pctx.errcode = 0;
1208                         count = 1;
1209                 }
1210                 if (pctx.errcode) {
1211                         pctx.blk = ext2fs_file_acl_block(fs, &inode);
1212                         fix_problem(ctx, PR_2_ADJ_EA_REFCOUNT, &pctx);
1213                         ctx->flags |= E2F_FLAG_ABORT;
1214                         return;
1215                 }
1216                 if (count == 0) {
1217                         ext2fs_unmark_block_bitmap2(ctx->block_found_map,
1218                                         ext2fs_file_acl_block(fs, &inode));
1219                         ext2fs_block_alloc_stats2(fs,
1220                                   ext2fs_file_acl_block(fs, &inode), -1);
1221                 }
1222                 ext2fs_file_acl_block_set(fs, &inode, 0);
1223         }
1224
1225         if (!ext2fs_inode_has_valid_blocks2(fs, &inode))
1226                 goto clear_inode;
1227
1228         if (LINUX_S_ISREG(inode.i_mode) &&
1229             ext2fs_needs_large_file_feature(EXT2_I_SIZE(&inode)))
1230                 ctx->large_files--;
1231
1232         del_block.ctx = ctx;
1233         del_block.num = 0;
1234         pctx.errcode = ext2fs_block_iterate3(fs, ino, 0, block_buf,
1235                                              deallocate_inode_block,
1236                                              &del_block);
1237         if (pctx.errcode) {
1238                 fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
1239                 ctx->flags |= E2F_FLAG_ABORT;
1240                 return;
1241         }
1242 clear_inode:
1243         /* Inode may have changed by block_iterate, so reread it */
1244         e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
1245         e2fsck_clear_inode(ctx, ino, &inode, 0, "deallocate_inode");
1246 }
1247
1248 /*
1249  * This fuction clears the htree flag on an inode
1250  */
1251 static void clear_htree(e2fsck_t ctx, ext2_ino_t ino)
1252 {
1253         struct ext2_inode       inode;
1254
1255         e2fsck_read_inode(ctx, ino, &inode, "clear_htree");
1256         inode.i_flags = inode.i_flags & ~EXT2_INDEX_FL;
1257         e2fsck_write_inode(ctx, ino, &inode, "clear_htree");
1258         if (ctx->dirs_to_hash)
1259                 ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
1260 }
1261
1262
1263 int e2fsck_process_bad_inode(e2fsck_t ctx, ext2_ino_t dir,
1264                              ext2_ino_t ino, char *buf)
1265 {
1266         ext2_filsys fs = ctx->fs;
1267         struct ext2_inode       inode;
1268         int                     inode_modified = 0;
1269         int                     not_fixed = 0;
1270         unsigned char           *frag, *fsize;
1271         struct problem_context  pctx;
1272         problem_t               problem = 0;
1273
1274         e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");
1275
1276         clear_problem_context(&pctx);
1277         pctx.ino = ino;
1278         pctx.dir = dir;
1279         pctx.inode = &inode;
1280
1281         if (ext2fs_file_acl_block(fs, &inode) &&
1282             !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
1283                 if (fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
1284                         ext2fs_file_acl_block_set(fs, &inode, 0);
1285                         inode_modified++;
1286                 } else
1287                         not_fixed++;
1288         }
1289
1290         if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) &&
1291             !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) &&
1292             !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) &&
1293             !(LINUX_S_ISSOCK(inode.i_mode)))
1294                 problem = PR_2_BAD_MODE;
1295         else if (LINUX_S_ISCHR(inode.i_mode)
1296                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1297                 problem = PR_2_BAD_CHAR_DEV;
1298         else if (LINUX_S_ISBLK(inode.i_mode)
1299                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1300                 problem = PR_2_BAD_BLOCK_DEV;
1301         else if (LINUX_S_ISFIFO(inode.i_mode)
1302                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1303                 problem = PR_2_BAD_FIFO;
1304         else if (LINUX_S_ISSOCK(inode.i_mode)
1305                  && !e2fsck_pass1_check_device_inode(fs, &inode))
1306                 problem = PR_2_BAD_SOCKET;
1307         else if (LINUX_S_ISLNK(inode.i_mode)
1308                  && !e2fsck_pass1_check_symlink(fs, ino, &inode, buf)) {
1309                 problem = PR_2_INVALID_SYMLINK;
1310         }
1311
1312         if (problem) {
1313                 if (fix_problem(ctx, problem, &pctx)) {
1314                         deallocate_inode(ctx, ino, 0);
1315                         if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
1316                                 return 0;
1317                         return 1;
1318                 } else
1319                         not_fixed++;
1320                 problem = 0;
1321         }
1322
1323         if (inode.i_faddr) {
1324                 if (fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
1325                         inode.i_faddr = 0;
1326                         inode_modified++;
1327                 } else
1328                         not_fixed++;
1329         }
1330
1331         switch (fs->super->s_creator_os) {
1332             case EXT2_OS_HURD:
1333                 frag = &inode.osd2.hurd2.h_i_frag;
1334                 fsize = &inode.osd2.hurd2.h_i_fsize;
1335                 break;
1336             default:
1337                 frag = fsize = 0;
1338         }
1339         if (frag && *frag) {
1340                 pctx.num = *frag;
1341                 if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
1342                         *frag = 0;
1343                         inode_modified++;
1344                 } else
1345                         not_fixed++;
1346                 pctx.num = 0;
1347         }
1348         if (fsize && *fsize) {
1349                 pctx.num = *fsize;
1350                 if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
1351                         *fsize = 0;
1352                         inode_modified++;
1353                 } else
1354                         not_fixed++;
1355                 pctx.num = 0;
1356         }
1357
1358         if ((fs->super->s_creator_os == EXT2_OS_LINUX) &&
1359             !(fs->super->s_feature_ro_compat &
1360               EXT4_FEATURE_RO_COMPAT_HUGE_FILE) &&
1361             (inode.osd2.linux2.l_i_blocks_hi != 0)) {
1362                 pctx.num = inode.osd2.linux2.l_i_blocks_hi;
1363                 if (fix_problem(ctx, PR_2_BLOCKS_HI_ZERO, &pctx)) {
1364                         inode.osd2.linux2.l_i_blocks_hi = 0;
1365                         inode_modified++;
1366                 }
1367         }
1368
1369         if (!(fs->super->s_feature_incompat &
1370              EXT4_FEATURE_INCOMPAT_64BIT) &&
1371             inode.osd2.linux2.l_i_file_acl_high != 0) {
1372                 pctx.num = inode.osd2.linux2.l_i_file_acl_high;
1373                 if (fix_problem(ctx, PR_2_I_FILE_ACL_HI_ZERO, &pctx)) {
1374                         inode.osd2.linux2.l_i_file_acl_high = 0;
1375                         inode_modified++;
1376                 } else
1377                         not_fixed++;
1378         }
1379
1380         if (ext2fs_file_acl_block(fs, &inode) &&
1381             ((ext2fs_file_acl_block(fs, &inode) < fs->super->s_first_data_block) ||
1382              (ext2fs_file_acl_block(fs, &inode) >= ext2fs_blocks_count(fs->super)))) {
1383                 if (fix_problem(ctx, PR_2_FILE_ACL_BAD, &pctx)) {
1384                         ext2fs_file_acl_block_set(fs, &inode, 0);
1385                         inode_modified++;
1386                 } else
1387                         not_fixed++;
1388         }
1389         if (inode.i_dir_acl &&
1390             LINUX_S_ISDIR(inode.i_mode)) {
1391                 if (fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
1392                         inode.i_dir_acl = 0;
1393                         inode_modified++;
1394                 } else
1395                         not_fixed++;
1396         }
1397
1398         if (inode_modified)
1399                 e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
1400         if (!not_fixed && ctx->inode_bad_map)
1401                 ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
1402         return 0;
1403 }
1404
1405
1406 /*
1407  * allocate_dir_block --- this function allocates a new directory
1408  *      block for a particular inode; this is done if a directory has
1409  *      a "hole" in it, or if a directory has a illegal block number
1410  *      that was zeroed out and now needs to be replaced.
1411  */
1412 static int allocate_dir_block(e2fsck_t ctx,
1413                               struct ext2_db_entry2 *db,
1414                               char *buf EXT2FS_ATTR((unused)),
1415                               struct problem_context *pctx)
1416 {
1417         ext2_filsys fs = ctx->fs;
1418         blk64_t                 blk;
1419         char                    *block;
1420         struct ext2_inode       inode;
1421
1422         if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
1423                 return 1;
1424
1425         /*
1426          * Read the inode and block bitmaps in; we'll be messing with
1427          * them.
1428          */
1429         e2fsck_read_bitmaps(ctx);
1430
1431         /*
1432          * First, find a free block
1433          */
1434         pctx->errcode = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk);
1435         if (pctx->errcode) {
1436                 pctx->str = "ext2fs_new_block";
1437                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1438                 return 1;
1439         }
1440         ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
1441         ext2fs_mark_block_bitmap2(fs->block_map, blk);
1442         ext2fs_mark_bb_dirty(fs);
1443
1444         /*
1445          * Now let's create the actual data block for the inode
1446          */
1447         if (db->blockcnt)
1448                 pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
1449         else
1450                 pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
1451                                                      EXT2_ROOT_INO, &block);
1452
1453         if (pctx->errcode) {
1454                 pctx->str = "ext2fs_new_dir_block";
1455                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1456                 return 1;
1457         }
1458
1459         pctx->errcode = ext2fs_write_dir_block3(fs, blk, block, 0);
1460         ext2fs_free_mem(&block);
1461         if (pctx->errcode) {
1462                 pctx->str = "ext2fs_write_dir_block";
1463                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1464                 return 1;
1465         }
1466
1467         /*
1468          * Update the inode block count
1469          */
1470         e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
1471         ext2fs_iblk_add_blocks(fs, &inode, 1);
1472         if (inode.i_size < (db->blockcnt+1) * fs->blocksize)
1473                 inode.i_size = (db->blockcnt+1) * fs->blocksize;
1474         e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");
1475
1476         /*
1477          * Finally, update the block pointers for the inode
1478          */
1479         db->blk = blk;
1480         pctx->errcode = ext2fs_bmap2(fs, db->ino, &inode, 0, BMAP_SET,
1481                                      db->blockcnt, 0, &blk);
1482         if (pctx->errcode) {
1483                 pctx->str = "ext2fs_block_iterate";
1484                 fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
1485                 return 1;
1486         }
1487
1488         return 0;
1489 }