e2fsck/pass1b.c

   1 /*
   2  * pass1b.c --- Pass #1b of e2fsck
   3  *
   4  * This file contains pass1B, pass1C, and pass1D of e2fsck.  They are
   5  * only invoked if pass 1 discovered blocks which are in use by more
   6  * than one inode.
   7  *
   8  * Pass1B scans the data blocks of all the inodes again, generating a
   9  * complete list of duplicate blocks and which inodes have claimed
  10  * them.
  11  *
  12  * Pass1C does a tree-traversal of the filesystem, to determine the
  13  * parent directories of these inodes.  This step is necessary so that
  14  * e2fsck can print out the pathnames of affected inodes.
  15  *
  16  * Pass1D is a reconciliation pass.  For each inode with duplicate
  17  * blocks, the user is prompted if s/he would like to clone the file
  18  * (so that the file gets a fresh copy of the duplicated blocks) or
  19  * simply to delete the file.
  20  *
  21  * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
  22  *
  23  * %Begin-Header%
  24  * This file may be redistributed under the terms of the GNU Public
  25  * License.
  26  * %End-Header%
  27  *
  28  */
  29
  30 #include "config.h"
  31 #include <time.h>
  32 #ifdef HAVE_ERRNO_H
  33 #include <errno.h>
  34 #endif
  35
  36 #ifdef HAVE_INTTYPES_H
  37 #include <inttypes.h>
  38 #endif
  39
  40 #ifndef HAVE_INTPTR_T
  41 typedef long intptr_t;
  42 #endif
  43
  44 /* Needed for architectures where sizeof(int) != sizeof(void *) */
  45 #define INT_TO_VOIDPTR(val)  ((void *)(intptr_t)(val))
  46 #define VOIDPTR_TO_INT(ptr)  ((int)(intptr_t)(ptr))
  47
  48 #include <et/com_err.h>
  49 #include "e2fsck.h"
  50
  51 #include "problem.h"
  52 #include "dict.h"
  53
  54 /* Define an extension to the ext2 library's block count information */
  55 #define BLOCK_COUNT_EXTATTR     (-5)
  56
  57 struct cluster_el {
  58         blk64_t cluster;
  59         struct cluster_el *next;
  60 };
  61
  62 struct inode_el {
  63         ext2_ino_t      inode;
  64         struct inode_el *next;
  65 };
  66
  67 struct dup_cluster {
  68         int             num_bad;
  69         struct inode_el *inode_list;
  70 };
  71
  72 /*
  73  * This structure stores information about a particular inode which
  74  * is sharing blocks with other inodes.  This information is collected
  75  * to display to the user, so that the user knows what files he or she
  76  * is dealing with, when trying to decide how to resolve the conflict
  77  * of multiply-claimed blocks.
  78  */
  79 struct dup_inode {
  80         ext2_ino_t              dir;
  81         int                     num_dupblocks;
  82         struct ext2_inode       inode;
  83         struct cluster_el       *cluster_list;
  84 };
  85
  86 static int process_pass1b_block(ext2_filsys fs, blk64_t *blocknr,
  87                                 e2_blkcnt_t blockcnt, blk64_t ref_blk,
  88                                 int ref_offset, void *priv_data);
  89 static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
  90                         struct dup_inode *dp, char *block_buf);
  91 static errcode_t clone_file(e2fsck_t ctx, ext2_ino_t ino,
  92                             struct dup_inode *dp, char* block_buf);
  93 static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block);
  94 static int check_if_fs_cluster(e2fsck_t ctx, blk64_t cluster);
  95
  96 static void pass1b(e2fsck_t ctx, char *block_buf);
  97 static void pass1c(e2fsck_t ctx, char *block_buf);
  98 static void pass1d(e2fsck_t ctx, char *block_buf);
  99
 100 static int dup_inode_count = 0;
 101 static int dup_inode_founddir = 0;
 102
 103 static dict_t clstr_dict, ino_dict;
 104
 105 static ext2fs_inode_bitmap inode_dup_map;
 106
 107 static int dict_int_cmp(const void *a, const void *b)
 108 {
 109         intptr_t        ia, ib;
 110
 111         ia = (intptr_t)a;
 112         ib = (intptr_t)b;
 113
 114         return (ia-ib);
 115 }
 116
 117 /*
 118  * Add a duplicate block record
 119  */
 120 static void add_dupe(e2fsck_t ctx, ext2_ino_t ino, blk64_t cluster,
 121                      struct ext2_inode *inode)
 122 {
 123         dnode_t *n;
 124         struct dup_cluster      *db;
 125         struct dup_inode        *di;
 126         struct cluster_el       *cluster_el;
 127         struct inode_el         *ino_el;
 128
 129         n = dict_lookup(&clstr_dict, INT_TO_VOIDPTR(cluster));
 130         if (n)
 131                 db = (struct dup_cluster *) dnode_get(n);
 132         else {
 133                 db = (struct dup_cluster *) e2fsck_allocate_memory(ctx,
 134                         sizeof(struct dup_cluster), "duplicate cluster header");
 135                 db->num_bad = 0;
 136                 db->inode_list = 0;
 137                 dict_alloc_insert(&clstr_dict, INT_TO_VOIDPTR(cluster), db);
 138         }
 139         ino_el = (struct inode_el *) e2fsck_allocate_memory(ctx,
 140                          sizeof(struct inode_el), "inode element");
 141         ino_el->inode = ino;
 142         ino_el->next = db->inode_list;
 143         db->inode_list = ino_el;
 144         db->num_bad++;
 145
 146         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(ino));
 147         if (n)
 148                 di = (struct dup_inode *) dnode_get(n);
 149         else {
 150                 di = (struct dup_inode *) e2fsck_allocate_memory(ctx,
 151                          sizeof(struct dup_inode), "duplicate inode header");
 152                 if (ino == EXT2_ROOT_INO) {
 153                         di->dir = EXT2_ROOT_INO;
 154                         dup_inode_founddir++;
 155                 } else
 156                         di->dir = 0;
 157
 158                 di->num_dupblocks = 0;
 159                 di->cluster_list = 0;
 160                 di->inode = *inode;
 161                 dict_alloc_insert(&ino_dict, INT_TO_VOIDPTR(ino), di);
 162         }
 163         cluster_el = (struct cluster_el *) e2fsck_allocate_memory(ctx,
 164                          sizeof(struct cluster_el), "cluster element");
 165         cluster_el->cluster = cluster;
 166         cluster_el->next = di->cluster_list;
 167         di->cluster_list = cluster_el;
 168         di->num_dupblocks++;
 169 }
 170
 171 /*
 172  * Free a duplicate inode record
 173  */
 174 static void inode_dnode_free(dnode_t *node,
 175                              void *context EXT2FS_ATTR((unused)))
 176 {
 177         struct dup_inode        *di;
 178         struct cluster_el               *p, *next;
 179
 180         di = (struct dup_inode *) dnode_get(node);
 181         for (p = di->cluster_list; p; p = next) {
 182                 next = p->next;
 183                 free(p);
 184         }
 185         free(di);
 186         free(node);
 187 }
 188
 189 /*
 190  * Free a duplicate cluster record
 191  */
 192 static void cluster_dnode_free(dnode_t *node,
 193                                void *context EXT2FS_ATTR((unused)))
 194 {
 195         struct dup_cluster      *dc;
 196         struct inode_el         *p, *next;
 197
 198         dc = (struct dup_cluster *) dnode_get(node);
 199         for (p = dc->inode_list; p; p = next) {
 200                 next = p->next;
 201                 free(p);
 202         }
 203         free(dc);
 204         free(node);
 205 }
 206
 207
 208 /*
 209  * Main procedure for handling duplicate blocks
 210  */
 211 void e2fsck_pass1_dupblocks(e2fsck_t ctx, char *block_buf)
 212 {
 213         ext2_filsys             fs = ctx->fs;
 214         struct problem_context  pctx;
 215 #ifdef RESOURCE_TRACK
 216         struct resource_track   rtrack;
 217 #endif
 218
 219         clear_problem_context(&pctx);
 220
 221         pctx.errcode = e2fsck_allocate_inode_bitmap(fs,
 222                         _("multiply claimed inode map"),
 223                         EXT2FS_BMAP64_RBTREE, "inode_dup_map",
 224                         &inode_dup_map);
 225         if (pctx.errcode) {
 226                 fix_problem(ctx, PR_1B_ALLOCATE_IBITMAP_ERROR, &pctx);
 227                 ctx->flags |= E2F_FLAG_ABORT;
 228                 return;
 229         }
 230
 231         dict_init(&ino_dict, DICTCOUNT_T_MAX, dict_int_cmp);
 232         dict_init(&clstr_dict, DICTCOUNT_T_MAX, dict_int_cmp);
 233         dict_set_allocator(&ino_dict, NULL, inode_dnode_free, NULL);
 234         dict_set_allocator(&clstr_dict, NULL, cluster_dnode_free, NULL);
 235
 236         init_resource_track(&rtrack, ctx->fs->io);
 237         pass1b(ctx, block_buf);
 238         print_resource_track(ctx, "Pass 1b", &rtrack, ctx->fs->io);
 239
 240         init_resource_track(&rtrack, ctx->fs->io);
 241         pass1c(ctx, block_buf);
 242         print_resource_track(ctx, "Pass 1c", &rtrack, ctx->fs->io);
 243
 244         init_resource_track(&rtrack, ctx->fs->io);
 245         pass1d(ctx, block_buf);
 246         print_resource_track(ctx, "Pass 1d", &rtrack, ctx->fs->io);
 247
 248         /*
 249          * Time to free all of the accumulated data structures that we
 250          * don't need anymore.
 251          */
 252         dict_free_nodes(&ino_dict);
 253         dict_free_nodes(&clstr_dict);
 254         ext2fs_free_inode_bitmap(inode_dup_map);
 255 }
 256
 257 /*
 258  * Scan the inodes looking for inodes that contain duplicate blocks.
 259  */
 260 struct process_block_struct {
 261         e2fsck_t        ctx;
 262         ext2_ino_t      ino;
 263         int             dup_blocks;
 264         blk64_t         cur_cluster;
 265         struct ext2_inode *inode;
 266         struct problem_context *pctx;
 267 };
 268
 269 static void pass1b(e2fsck_t ctx, char *block_buf)
 270 {
 271         ext2_filsys fs = ctx->fs;
 272         ext2_ino_t ino = 0;
 273         struct ext2_inode inode;
 274         ext2_inode_scan scan;
 275         struct process_block_struct pb;
 276         struct problem_context pctx;
 277
 278         clear_problem_context(&pctx);
 279
 280         if (!(ctx->options & E2F_OPT_PREEN))
 281                 fix_problem(ctx, PR_1B_PASS_HEADER, &pctx);
 282         pctx.errcode = ext2fs_open_inode_scan(fs, ctx->inode_buffer_blocks,
 283                                               &scan);
 284         if (pctx.errcode) {
 285                 fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
 286                 ctx->flags |= E2F_FLAG_ABORT;
 287                 return;
 288         }
 289         ctx->stashed_inode = &inode;
 290         pb.ctx = ctx;
 291         pb.pctx = &pctx;
 292         pctx.str = "pass1b";
 293         while (1) {
 294                 if (ino % (fs->super->s_inodes_per_group * 4) == 1) {
 295                         if (e2fsck_mmp_update(fs))
 296                                 fatal_error(ctx, 0);
 297                 }
 298                 pctx.errcode = ext2fs_get_next_inode(scan, &ino, &inode);
 299                 if (pctx.errcode == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
 300                         continue;
 301                 if (pctx.errcode) {
 302                         fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
 303                         ctx->flags |= E2F_FLAG_ABORT;
 304                         return;
 305                 }
 306                 if (!ino)
 307                         break;
 308                 pctx.ino = ctx->stashed_ino = ino;
 309                 if ((ino != EXT2_BAD_INO) &&
 310                     !ext2fs_test_inode_bitmap2(ctx->inode_used_map, ino))
 311                         continue;
 312
 313                 pb.ino = ino;
 314                 pb.dup_blocks = 0;
 315                 pb.inode = &inode;
 316                 pb.cur_cluster = ~0;
 317
 318                 if (ext2fs_inode_has_valid_blocks2(fs, &inode) ||
 319                     (ino == EXT2_BAD_INO))
 320                         pctx.errcode = ext2fs_block_iterate3(fs, ino,
 321                                              BLOCK_FLAG_READ_ONLY, block_buf,
 322                                              process_pass1b_block, &pb);
 323                 /* If the feature is not set, attrs will be cleared later anyway */
 324                 if ((fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR) &&
 325                     ext2fs_file_acl_block(fs, &inode)) {
 326                         blk64_t blk = ext2fs_file_acl_block(fs, &inode);
 327                         process_pass1b_block(fs, &blk,
 328                                              BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 329                         ext2fs_file_acl_block_set(fs, &inode, blk);
 330                 }
 331                 if (pb.dup_blocks) {
 332                         end_problem_latch(ctx, PR_LATCH_DBLOCK);
 333                         if (ino >= EXT2_FIRST_INODE(fs->super) ||
 334                             ino == EXT2_ROOT_INO)
 335                                 dup_inode_count++;
 336                 }
 337                 if (pctx.errcode)
 338                         fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 339         }
 340         ext2fs_close_inode_scan(scan);
 341         e2fsck_use_inode_shortcuts(ctx, 0);
 342 }
 343
 344 static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
 345                                 blk64_t *block_nr,
 346                                 e2_blkcnt_t blockcnt,
 347                                 blk64_t ref_blk EXT2FS_ATTR((unused)),
 348                                 int ref_offset EXT2FS_ATTR((unused)),
 349                                 void *priv_data)
 350 {
 351         struct process_block_struct *p;
 352         e2fsck_t ctx;
 353         blk64_t lc;
 354
 355         if (HOLE_BLKADDR(*block_nr))
 356                 return 0;
 357         p = (struct process_block_struct *) priv_data;
 358         ctx = p->ctx;
 359         lc = EXT2FS_B2C(fs, blockcnt);
 360
 361         if (!ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr))
 362                 goto finish;
 363
 364         /* OK, this is a duplicate block */
 365         if (p->ino != EXT2_BAD_INO) {
 366                 p->pctx->blk = *block_nr;
 367                 fix_problem(ctx, PR_1B_DUP_BLOCK, p->pctx);
 368         }
 369         p->dup_blocks++;
 370         ext2fs_mark_inode_bitmap2(inode_dup_map, p->ino);
 371
 372         if (lc != p->cur_cluster)
 373                 add_dupe(ctx, p->ino, EXT2FS_B2C(fs, *block_nr), p->inode);
 374
 375 finish:
 376         p->cur_cluster = lc;
 377         return 0;
 378 }
 379
 380 /*
 381  * Pass 1c: Scan directories for inodes with duplicate blocks.  This
 382  * is used so that we can print pathnames when prompting the user for
 383  * what to do.
 384  */
 385 struct search_dir_struct {
 386         int             count;
 387         ext2_ino_t      first_inode;
 388         ext2_ino_t      max_inode;
 389 };
 390
 391 static int search_dirent_proc(ext2_ino_t dir, int entry,
 392                               struct ext2_dir_entry *dirent,
 393                               int offset EXT2FS_ATTR((unused)),
 394                               int blocksize EXT2FS_ATTR((unused)),
 395                               char *buf EXT2FS_ATTR((unused)),
 396                               void *priv_data)
 397 {
 398         struct search_dir_struct *sd;
 399         struct dup_inode        *p;
 400         dnode_t                 *n;
 401
 402         sd = (struct search_dir_struct *) priv_data;
 403
 404         if (dirent->inode > sd->max_inode)
 405                 /* Should abort this inode, but not everything */
 406                 return 0;
 407
 408         if ((dirent->inode < sd->first_inode) || (entry < DIRENT_OTHER_FILE) ||
 409             !ext2fs_test_inode_bitmap2(inode_dup_map, dirent->inode))
 410                 return 0;
 411
 412         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(dirent->inode));
 413         if (!n)
 414                 return 0;
 415         p = (struct dup_inode *) dnode_get(n);
 416         if (!p->dir) {
 417                 p->dir = dir;
 418                 sd->count--;
 419         }
 420
 421         return(sd->count ? 0 : DIRENT_ABORT);
 422 }
 423
 424
 425 static void pass1c(e2fsck_t ctx, char *block_buf)
 426 {
 427         ext2_filsys fs = ctx->fs;
 428         struct search_dir_struct sd;
 429         struct problem_context pctx;
 430
 431         clear_problem_context(&pctx);
 432
 433         if (!(ctx->options & E2F_OPT_PREEN))
 434                 fix_problem(ctx, PR_1C_PASS_HEADER, &pctx);
 435
 436         /*
 437          * Search through all directories to translate inodes to names
 438          * (by searching for the containing directory for that inode.)
 439          */
 440         sd.count = dup_inode_count - dup_inode_founddir;
 441         sd.first_inode = EXT2_FIRST_INODE(fs->super);
 442         sd.max_inode = fs->super->s_inodes_count;
 443         ext2fs_dblist_dir_iterate(fs->dblist, 0, block_buf,
 444                                   search_dirent_proc, &sd);
 445 }
 446
 447 static void pass1d(e2fsck_t ctx, char *block_buf)
 448 {
 449         ext2_filsys fs = ctx->fs;
 450         struct dup_inode        *p, *t;
 451         struct dup_cluster      *q;
 452         ext2_ino_t              *shared, ino;
 453         int     shared_len;
 454         int     i;
 455         int     file_ok;
 456         int     meta_data = 0;
 457         struct problem_context pctx;
 458         dnode_t *n, *m;
 459         struct cluster_el       *s;
 460         struct inode_el *r;
 461
 462         clear_problem_context(&pctx);
 463
 464         if (!(ctx->options & E2F_OPT_PREEN))
 465                 fix_problem(ctx, PR_1D_PASS_HEADER, &pctx);
 466         e2fsck_read_bitmaps(ctx);
 467
 468         pctx.num = dup_inode_count; /* dict_count(&ino_dict); */
 469         fix_problem(ctx, PR_1D_NUM_DUP_INODES, &pctx);
 470         shared = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
 471                                 sizeof(ext2_ino_t) * dict_count(&ino_dict),
 472                                 "Shared inode list");
 473         for (n = dict_first(&ino_dict); n; n = dict_next(&ino_dict, n)) {
 474                 p = (struct dup_inode *) dnode_get(n);
 475                 shared_len = 0;
 476                 file_ok = 1;
 477                 ino = (ext2_ino_t)VOIDPTR_TO_INT(dnode_getkey(n));
 478                 if (ino == EXT2_BAD_INO || ino == EXT2_RESIZE_INO)
 479                         continue;
 480
 481                 /*
 482                  * Find all of the inodes which share blocks with this
 483                  * one.  First we find all of the duplicate blocks
 484                  * belonging to this inode, and then search each block
 485                  * get the list of inodes, and merge them together.
 486                  */
 487                 for (s = p->cluster_list; s; s = s->next) {
 488                         m = dict_lookup(&clstr_dict,
 489                                         INT_TO_VOIDPTR(s->cluster));
 490                         if (!m)
 491                                 continue; /* Should never happen... */
 492                         q = (struct dup_cluster *) dnode_get(m);
 493                         if (q->num_bad > 1)
 494                                 file_ok = 0;
 495                         if (check_if_fs_cluster(ctx, s->cluster)) {
 496                                 file_ok = 0;
 497                                 meta_data = 1;
 498                         }
 499
 500                         /*
 501                          * Add all inodes used by this block to the
 502                          * shared[] --- which is a unique list, so
 503                          * if an inode is already in shared[], don't
 504                          * add it again.
 505                          */
 506                         for (r = q->inode_list; r; r = r->next) {
 507                                 if (r->inode == ino)
 508                                         continue;
 509                                 for (i = 0; i < shared_len; i++)
 510                                         if (shared[i] == r->inode)
 511                                                 break;
 512                                 if (i == shared_len) {
 513                                         shared[shared_len++] = r->inode;
 514                                 }
 515                         }
 516                 }
 517
 518                 /*
 519                  * Report the inode that we are working on
 520                  */
 521                 pctx.inode = &p->inode;
 522                 pctx.ino = ino;
 523                 pctx.dir = p->dir;
 524                 pctx.blkcount = p->num_dupblocks;
 525                 pctx.num = meta_data ? shared_len+1 : shared_len;
 526                 fix_problem(ctx, PR_1D_DUP_FILE, &pctx);
 527                 pctx.blkcount = 0;
 528                 pctx.num = 0;
 529
 530                 if (meta_data)
 531                         fix_problem(ctx, PR_1D_SHARE_METADATA, &pctx);
 532
 533                 for (i = 0; i < shared_len; i++) {
 534                         m = dict_lookup(&ino_dict, INT_TO_VOIDPTR(shared[i]));
 535                         if (!m)
 536                                 continue; /* should never happen */
 537                         t = (struct dup_inode *) dnode_get(m);
 538                         /*
 539                          * Report the inode that we are sharing with
 540                          */
 541                         pctx.inode = &t->inode;
 542                         pctx.ino = shared[i];
 543                         pctx.dir = t->dir;
 544                         fix_problem(ctx, PR_1D_DUP_FILE_LIST, &pctx);
 545                 }
 546                 if (file_ok) {
 547                         fix_problem(ctx, PR_1D_DUP_BLOCKS_DEALT, &pctx);
 548                         continue;
 549                 }
 550                 if (fix_problem(ctx, PR_1D_CLONE_QUESTION, &pctx)) {
 551                         pctx.errcode = clone_file(ctx, ino, p, block_buf);
 552                         if (pctx.errcode)
 553                                 fix_problem(ctx, PR_1D_CLONE_ERROR, &pctx);
 554                         else
 555                                 continue;
 556                 }
 557                 if (fix_problem(ctx, PR_1D_DELETE_QUESTION, &pctx))
 558                         delete_file(ctx, ino, p, block_buf);
 559                 else
 560                         ext2fs_unmark_valid(fs);
 561         }
 562         ext2fs_free_mem(&shared);
 563 }
 564
 565 /*
 566  * Drop the refcount on the dup_block structure, and clear the entry
 567  * in the block_dup_map if appropriate.
 568  */
 569 static void decrement_badcount(e2fsck_t ctx, blk64_t block,
 570                                struct dup_cluster *p)
 571 {
 572         p->num_bad--;
 573         if (p->num_bad <= 0 ||
 574             (p->num_bad == 1 && !check_if_fs_block(ctx, block))) {
 575                 if (check_if_fs_cluster(ctx, EXT2FS_B2C(ctx->fs, block)))
 576                         return;
 577                 ext2fs_unmark_block_bitmap2(ctx->block_dup_map, block);
 578         }
 579 }
 580
 581 static int delete_file_block(ext2_filsys fs,
 582                              blk64_t    *block_nr,
 583                              e2_blkcnt_t blockcnt,
 584                              blk64_t ref_block EXT2FS_ATTR((unused)),
 585                              int ref_offset EXT2FS_ATTR((unused)),
 586                              void *priv_data)
 587 {
 588         struct process_block_struct *pb;
 589         struct dup_cluster *p;
 590         dnode_t *n;
 591         e2fsck_t ctx;
 592         blk64_t c, lc;
 593
 594         pb = (struct process_block_struct *) priv_data;
 595         ctx = pb->ctx;
 596
 597         if (HOLE_BLKADDR(*block_nr))
 598                 return 0;
 599
 600         c = EXT2FS_B2C(fs, *block_nr);
 601         lc = EXT2FS_B2C(fs, blockcnt);
 602         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 603                 n = dict_lookup(&clstr_dict, INT_TO_VOIDPTR(c));
 604                 if (n) {
 605                         p = (struct dup_cluster *) dnode_get(n);
 606                         if (lc != pb->cur_cluster)
 607                                 decrement_badcount(ctx, *block_nr, p);
 608                 } else
 609                         com_err("delete_file_block", 0,
 610                             _("internal error: can't find dup_blk for %llu\n"),
 611                                 *block_nr);
 612         } else {
 613                 ext2fs_unmark_block_bitmap2(ctx->block_found_map, *block_nr);
 614                 ext2fs_block_alloc_stats2(fs, *block_nr, -1);
 615                 pb->dup_blocks++;
 616         }
 617         pb->cur_cluster = lc;
 618
 619         return 0;
 620 }
 621
 622 static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
 623                         struct dup_inode *dp, char* block_buf)
 624 {
 625         ext2_filsys fs = ctx->fs;
 626         struct process_block_struct pb;
 627         struct problem_context  pctx;
 628         unsigned int            count;
 629
 630         clear_problem_context(&pctx);
 631         pctx.ino = pb.ino = ino;
 632         pb.dup_blocks = 0;
 633         pb.ctx = ctx;
 634         pctx.str = "delete_file";
 635         pb.cur_cluster = ~0;
 636
 637         if (ext2fs_inode_has_valid_blocks2(fs, &dp->inode))
 638                 pctx.errcode = ext2fs_block_iterate3(fs, ino,
 639                                                      BLOCK_FLAG_READ_ONLY,
 640                                                      block_buf,
 641                                                      delete_file_block, &pb);
 642         if (pctx.errcode)
 643                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 644         if (ctx->inode_bad_map)
 645                 ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
 646         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(dp->inode.i_mode));
 647         quota_data_sub(ctx->qctx, &dp->inode, ino,
 648                        pb.dup_blocks * fs->blocksize);
 649         quota_data_inodes(ctx->qctx, &dp->inode, ino, -1);
 650
 651         /* Inode may have changed by block_iterate, so reread it */
 652         e2fsck_read_inode(ctx, ino, &dp->inode, "delete_file");
 653         e2fsck_clear_inode(ctx, ino, &dp->inode, 0, "delete_file");
 654         if (ext2fs_file_acl_block(fs, &dp->inode) &&
 655             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
 656                 count = 1;
 657                 pctx.errcode = ext2fs_adjust_ea_refcount3(fs,
 658                                         ext2fs_file_acl_block(fs, &dp->inode),
 659                                         block_buf, -1, &count, ino);
 660                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
 661                         pctx.errcode = 0;
 662                         count = 1;
 663                 }
 664                 if (pctx.errcode) {
 665                         pctx.blk = ext2fs_file_acl_block(fs, &dp->inode);
 666                         fix_problem(ctx, PR_1B_ADJ_EA_REFCOUNT, &pctx);
 667                 }
 668                 /*
 669                  * If the count is zero, then arrange to have the
 670                  * block deleted.  If the block is in the block_dup_map,
 671                  * also call delete_file_block since it will take care
 672                  * of keeping the accounting straight.
 673                  */
 674                 if ((count == 0) ||
 675                     ext2fs_test_block_bitmap2(ctx->block_dup_map,
 676                                         ext2fs_file_acl_block(fs, &dp->inode))) {
 677                         blk64_t blk = ext2fs_file_acl_block(fs, &dp->inode);
 678                         delete_file_block(fs, &blk,
 679                                           BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 680                         ext2fs_file_acl_block_set(fs, &dp->inode, blk);
 681                         quota_data_sub(ctx->qctx, &dp->inode, ino, fs->blocksize);
 682                 }
 683         }
 684 }
 685
 686 struct clone_struct {
 687         errcode_t       errcode;
 688         blk64_t         dup_cluster;
 689         blk64_t         alloc_block;
 690         ext2_ino_t      dir;
 691         char    *buf;
 692         e2fsck_t ctx;
 693 };
 694
 695 static int clone_file_block(ext2_filsys fs,
 696                             blk64_t     *block_nr,
 697                             e2_blkcnt_t blockcnt,
 698                             blk64_t ref_block EXT2FS_ATTR((unused)),
 699                             int ref_offset EXT2FS_ATTR((unused)),
 700                             void *priv_data)
 701 {
 702         struct dup_cluster *p;
 703         blk64_t new_block;
 704         errcode_t       retval;
 705         struct clone_struct *cs = (struct clone_struct *) priv_data;
 706         dnode_t *n;
 707         e2fsck_t ctx;
 708         blk64_t c;
 709         int is_meta = 0;
 710
 711         ctx = cs->ctx;
 712
 713         if (HOLE_BLKADDR(*block_nr))
 714                 return 0;
 715
 716         c = EXT2FS_B2C(fs, blockcnt);
 717         if (check_if_fs_cluster(ctx, EXT2FS_B2C(fs, *block_nr)))
 718                 is_meta = 1;
 719
 720         if (c == cs->dup_cluster && cs->alloc_block) {
 721                 new_block = cs->alloc_block;
 722                 goto got_block;
 723         }
 724
 725         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 726                 n = dict_lookup(&clstr_dict,
 727                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, *block_nr)));
 728                 if (!n) {
 729                         com_err("clone_file_block", 0,
 730                             _("internal error: can't find dup_blk for %llu\n"),
 731                                 *block_nr);
 732                         return 0;
 733                 }
 734
 735                 p = (struct dup_cluster *) dnode_get(n);
 736                 if (!is_meta)
 737                         decrement_badcount(ctx, *block_nr, p);
 738
 739                 cs->dup_cluster = c;
 740
 741                 retval = ext2fs_new_block2(fs, 0, ctx->block_found_map,
 742                                            &new_block);
 743                 if (retval) {
 744                         cs->errcode = retval;
 745                         return BLOCK_ABORT;
 746                 }
 747                 cs->alloc_block = new_block;
 748
 749         got_block:
 750                 new_block &= ~EXT2FS_CLUSTER_MASK(fs);
 751                 new_block += EXT2FS_CLUSTER_MASK(fs) & blockcnt;
 752                 if (cs->dir && (blockcnt >= 0)) {
 753                         retval = ext2fs_set_dir_block2(fs->dblist,
 754                                         cs->dir, new_block, blockcnt);
 755                         if (retval) {
 756                                 cs->errcode = retval;
 757                                 return BLOCK_ABORT;
 758                         }
 759                 }
 760 #if 0
 761                 printf("Cloning block #%lld from %llu to %llu\n",
 762                        blockcnt, *block_nr, new_block);
 763 #endif
 764                 retval = io_channel_read_blk64(fs->io, *block_nr, 1, cs->buf);
 765                 if (retval) {
 766                         cs->errcode = retval;
 767                         return BLOCK_ABORT;
 768                 }
 769                 retval = io_channel_write_blk64(fs->io, new_block, 1, cs->buf);
 770                 if (retval) {
 771                         cs->errcode = retval;
 772                         return BLOCK_ABORT;
 773                 }
 774                 *block_nr = new_block;
 775                 ext2fs_mark_block_bitmap2(ctx->block_found_map, new_block);
 776                 ext2fs_mark_block_bitmap2(fs->block_map, new_block);
 777                 return BLOCK_CHANGED;
 778         }
 779         return 0;
 780 }
 781
 782 static errcode_t clone_file(e2fsck_t ctx, ext2_ino_t ino,
 783                             struct dup_inode *dp, char* block_buf)
 784 {
 785         ext2_filsys fs = ctx->fs;
 786         errcode_t       retval;
 787         struct clone_struct cs;
 788         struct problem_context  pctx;
 789         blk64_t         blk, new_blk;
 790         dnode_t         *n;
 791         struct inode_el *ino_el;
 792         struct dup_cluster      *dc;
 793         struct dup_inode        *di;
 794
 795         clear_problem_context(&pctx);
 796         cs.errcode = 0;
 797         cs.dir = 0;
 798         cs.dup_cluster = ~0;
 799         cs.alloc_block = 0;
 800         cs.ctx = ctx;
 801         retval = ext2fs_get_mem(fs->blocksize, &cs.buf);
 802         if (retval)
 803                 return retval;
 804
 805         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, ino))
 806                 cs.dir = ino;
 807
 808         pctx.ino = ino;
 809         pctx.str = "clone_file";
 810         if (ext2fs_inode_has_valid_blocks2(fs, &dp->inode))
 811                 pctx.errcode = ext2fs_block_iterate3(fs, ino, 0, block_buf,
 812                                                      clone_file_block, &cs);
 813         ext2fs_mark_bb_dirty(fs);
 814         if (pctx.errcode) {
 815                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 816                 retval = pctx.errcode;
 817                 goto errout;
 818         }
 819         if (cs.errcode) {
 820                 com_err("clone_file", cs.errcode,
 821                         _("returned from clone_file_block"));
 822                 retval = cs.errcode;
 823                 goto errout;
 824         }
 825         /* The inode may have changed on disk, so we have to re-read it */
 826         e2fsck_read_inode(ctx, ino, &dp->inode, "clone file EA");
 827         blk = ext2fs_file_acl_block(fs, &dp->inode);
 828         new_blk = blk;
 829         if (blk && (clone_file_block(fs, &new_blk,
 830                                      BLOCK_COUNT_EXTATTR, 0, 0, &cs) ==
 831                     BLOCK_CHANGED)) {
 832                 ext2fs_file_acl_block_set(fs, &dp->inode, new_blk);
 833                 e2fsck_write_inode(ctx, ino, &dp->inode, "clone file EA");
 834                 /*
 835                  * If we cloned the EA block, find all other inodes
 836                  * which refered to that EA block, and modify
 837                  * them to point to the new EA block.
 838                  */
 839                 n = dict_lookup(&clstr_dict,
 840                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, blk)));
 841                 if (!n) {
 842                         com_err("clone_file", 0,
 843                                 _("internal error: couldn't lookup EA "
 844                                   "block record for %llu"), blk);
 845                         retval = 0; /* OK to stumble on... */
 846                         goto errout;
 847                 }
 848                 dc = (struct dup_cluster *) dnode_get(n);
 849                 for (ino_el = dc->inode_list; ino_el; ino_el = ino_el->next) {
 850                         if (ino_el->inode == ino)
 851                                 continue;
 852                         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(ino_el->inode));
 853                         if (!n) {
 854                                 com_err("clone_file", 0,
 855                                         _("internal error: couldn't lookup EA "
 856                                           "inode record for %u"),
 857                                         ino_el->inode);
 858                                 retval = 0; /* OK to stumble on... */
 859                                 goto errout;
 860                         }
 861                         di = (struct dup_inode *) dnode_get(n);
 862                         if (ext2fs_file_acl_block(fs, &di->inode) == blk) {
 863                                 ext2fs_file_acl_block_set(fs, &di->inode,
 864                                         ext2fs_file_acl_block(fs, &dp->inode));
 865                                 e2fsck_write_inode(ctx, ino_el->inode,
 866                                            &di->inode, "clone file EA");
 867                                 decrement_badcount(ctx, blk, dc);
 868                         }
 869                 }
 870         }
 871         retval = 0;
 872 errout:
 873         ext2fs_free_mem(&cs.buf);
 874         return retval;
 875 }
 876
 877 /*
 878  * This routine returns 1 if a block overlaps with one of the superblocks,
 879  * group descriptors, inode bitmaps, or block bitmaps.
 880  */
 881 static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block)
 882 {
 883         ext2_filsys fs = ctx->fs;
 884         blk64_t first_block;
 885         dgrp_t  i;
 886
 887         first_block = fs->super->s_first_data_block;
 888         for (i = 0; i < fs->group_desc_count; i++) {
 889
 890                 /* Check superblocks/block group descriptors */
 891                 if (ext2fs_bg_has_super(fs, i)) {
 892                         if (test_block >= first_block &&
 893                             (test_block <= first_block + fs->desc_blocks))
 894                                 return 1;
 895                 }
 896
 897                 /* Check the inode table */
 898                 if ((ext2fs_inode_table_loc(fs, i)) &&
 899                     (test_block >= ext2fs_inode_table_loc(fs, i)) &&
 900                     (test_block < (ext2fs_inode_table_loc(fs, i) +
 901                                    fs->inode_blocks_per_group)))
 902                         return 1;
 903
 904                 /* Check the bitmap blocks */
 905                 if ((test_block == ext2fs_block_bitmap_loc(fs, i)) ||
 906                     (test_block == ext2fs_inode_bitmap_loc(fs, i)))
 907                         return 1;
 908
 909                 first_block += fs->super->s_blocks_per_group;
 910         }
 911         return 0;
 912 }
 913
 914 /*
 915  * This routine returns 1 if a cluster overlaps with one of the superblocks,
 916  * group descriptors, inode bitmaps, or block bitmaps.
 917  */
 918 static int check_if_fs_cluster(e2fsck_t ctx, blk64_t cluster)
 919 {
 920         ext2_filsys fs = ctx->fs;
 921         blk64_t first_block;
 922         dgrp_t  i;
 923
 924         first_block = fs->super->s_first_data_block;
 925         for (i = 0; i < fs->group_desc_count; i++) {
 926
 927                 /* Check superblocks/block group descriptors */
 928                 if (ext2fs_bg_has_super(fs, i)) {
 929                         if (cluster >= EXT2FS_B2C(fs, first_block) &&
 930                             (cluster <= EXT2FS_B2C(fs, first_block +
 931                                                    fs->desc_blocks)))
 932                                 return 1;
 933                 }
 934
 935                 /* Check the inode table */
 936                 if ((ext2fs_inode_table_loc(fs, i)) &&
 937                     (cluster >= EXT2FS_B2C(fs,
 938                                            ext2fs_inode_table_loc(fs, i))) &&
 939                     (cluster <= EXT2FS_B2C(fs,
 940                                            ext2fs_inode_table_loc(fs, i) +
 941                                            fs->inode_blocks_per_group - 1)))
 942                         return 1;
 943
 944                 /* Check the bitmap blocks */
 945                 if ((cluster == EXT2FS_B2C(fs,
 946                                            ext2fs_block_bitmap_loc(fs, i))) ||
 947                     (cluster == EXT2FS_B2C(fs,
 948                                            ext2fs_inode_bitmap_loc(fs, i))))
 949                         return 1;
 950
 951                 first_block += fs->super->s_blocks_per_group;
 952         }
 953         return 0;
 954 }