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, phys_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                         pctx.ino = ino;
 303                         fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
 304                         ctx->flags |= E2F_FLAG_ABORT;
 305                         return;
 306                 }
 307                 if (!ino)
 308                         break;
 309                 pctx.ino = ctx->stashed_ino = ino;
 310                 if ((ino != EXT2_BAD_INO) &&
 311                     !ext2fs_test_inode_bitmap2(ctx->inode_used_map, ino))
 312                         continue;
 313
 314                 pb.ino = ino;
 315                 pb.dup_blocks = 0;
 316                 pb.inode = &inode;
 317                 pb.cur_cluster = ~0;
 318                 pb.phys_cluster = ~0;
 319
 320                 if (ext2fs_inode_has_valid_blocks2(fs, &inode) ||
 321                     (ino == EXT2_BAD_INO))
 322                         pctx.errcode = ext2fs_block_iterate3(fs, ino,
 323                                              BLOCK_FLAG_READ_ONLY, block_buf,
 324                                              process_pass1b_block, &pb);
 325                 /* If the feature is not set, attrs will be cleared later anyway */
 326                 if ((fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR) &&
 327                     ext2fs_file_acl_block(fs, &inode)) {
 328                         blk64_t blk = ext2fs_file_acl_block(fs, &inode);
 329                         process_pass1b_block(fs, &blk,
 330                                              BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 331                         ext2fs_file_acl_block_set(fs, &inode, blk);
 332                 }
 333                 if (pb.dup_blocks) {
 334                         end_problem_latch(ctx, PR_LATCH_DBLOCK);
 335                         if (ino >= EXT2_FIRST_INODE(fs->super) ||
 336                             ino == EXT2_ROOT_INO)
 337                                 dup_inode_count++;
 338                 }
 339                 if (pctx.errcode)
 340                         fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 341         }
 342         ext2fs_close_inode_scan(scan);
 343         e2fsck_use_inode_shortcuts(ctx, 0);
 344 }
 345
 346 static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
 347                                 blk64_t *block_nr,
 348                                 e2_blkcnt_t blockcnt,
 349                                 blk64_t ref_blk EXT2FS_ATTR((unused)),
 350                                 int ref_offset EXT2FS_ATTR((unused)),
 351                                 void *priv_data)
 352 {
 353         struct process_block_struct *p;
 354         e2fsck_t ctx;
 355         blk64_t lc, pc;
 356
 357         if (HOLE_BLKADDR(*block_nr))
 358                 return 0;
 359         p = (struct process_block_struct *) priv_data;
 360         ctx = p->ctx;
 361         lc = EXT2FS_B2C(fs, blockcnt);
 362         pc = EXT2FS_B2C(fs, *block_nr);
 363
 364         if (!ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr))
 365                 goto finish;
 366
 367         /* OK, this is a duplicate block */
 368         if (p->ino != EXT2_BAD_INO) {
 369                 p->pctx->blk = *block_nr;
 370                 fix_problem(ctx, PR_1B_DUP_BLOCK, p->pctx);
 371         }
 372         p->dup_blocks++;
 373         ext2fs_mark_inode_bitmap2(inode_dup_map, p->ino);
 374
 375         /*
 376          * Qualifications for submitting a block for duplicate processing:
 377          * It's an extent/indirect block (and has a negative logical offset);
 378          * we've crossed a logical cluster boundary; or the physical cluster
 379          * suddenly changed, which indicates that blocks in a logical cluster
 380          * are mapped to multiple physical clusters.
 381          */
 382         if (blockcnt < 0 || lc != p->cur_cluster || pc != p->phys_cluster)
 383                 add_dupe(ctx, p->ino, EXT2FS_B2C(fs, *block_nr), p->inode);
 384
 385 finish:
 386         p->cur_cluster = lc;
 387         p->phys_cluster = pc;
 388         return 0;
 389 }
 390
 391 /*
 392  * Pass 1c: Scan directories for inodes with duplicate blocks.  This
 393  * is used so that we can print pathnames when prompting the user for
 394  * what to do.
 395  */
 396 struct search_dir_struct {
 397         int             count;
 398         ext2_ino_t      first_inode;
 399         ext2_ino_t      max_inode;
 400 };
 401
 402 static int search_dirent_proc(ext2_ino_t dir, int entry,
 403                               struct ext2_dir_entry *dirent,
 404                               int offset EXT2FS_ATTR((unused)),
 405                               int blocksize EXT2FS_ATTR((unused)),
 406                               char *buf EXT2FS_ATTR((unused)),
 407                               void *priv_data)
 408 {
 409         struct search_dir_struct *sd;
 410         struct dup_inode        *p;
 411         dnode_t                 *n;
 412
 413         sd = (struct search_dir_struct *) priv_data;
 414
 415         if (dirent->inode > sd->max_inode)
 416                 /* Should abort this inode, but not everything */
 417                 return 0;
 418
 419         if ((dirent->inode < sd->first_inode) || (entry < DIRENT_OTHER_FILE) ||
 420             !ext2fs_test_inode_bitmap2(inode_dup_map, dirent->inode))
 421                 return 0;
 422
 423         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(dirent->inode));
 424         if (!n)
 425                 return 0;
 426         p = (struct dup_inode *) dnode_get(n);
 427         if (!p->dir) {
 428                 p->dir = dir;
 429                 sd->count--;
 430         }
 431
 432         return(sd->count ? 0 : DIRENT_ABORT);
 433 }
 434
 435
 436 static void pass1c(e2fsck_t ctx, char *block_buf)
 437 {
 438         ext2_filsys fs = ctx->fs;
 439         struct search_dir_struct sd;
 440         struct problem_context pctx;
 441
 442         clear_problem_context(&pctx);
 443
 444         if (!(ctx->options & E2F_OPT_PREEN))
 445                 fix_problem(ctx, PR_1C_PASS_HEADER, &pctx);
 446
 447         /*
 448          * Search through all directories to translate inodes to names
 449          * (by searching for the containing directory for that inode.)
 450          */
 451         sd.count = dup_inode_count - dup_inode_founddir;
 452         sd.first_inode = EXT2_FIRST_INODE(fs->super);
 453         sd.max_inode = fs->super->s_inodes_count;
 454         ext2fs_dblist_dir_iterate(fs->dblist, 0, block_buf,
 455                                   search_dirent_proc, &sd);
 456 }
 457
 458 static void pass1d(e2fsck_t ctx, char *block_buf)
 459 {
 460         ext2_filsys fs = ctx->fs;
 461         struct dup_inode        *p, *t;
 462         struct dup_cluster      *q;
 463         ext2_ino_t              *shared, ino;
 464         int     shared_len;
 465         int     i;
 466         int     file_ok;
 467         int     meta_data = 0;
 468         struct problem_context pctx;
 469         dnode_t *n, *m;
 470         struct cluster_el       *s;
 471         struct inode_el *r;
 472
 473         clear_problem_context(&pctx);
 474
 475         if (!(ctx->options & E2F_OPT_PREEN))
 476                 fix_problem(ctx, PR_1D_PASS_HEADER, &pctx);
 477         e2fsck_read_bitmaps(ctx);
 478
 479         pctx.num = dup_inode_count; /* dict_count(&ino_dict); */
 480         fix_problem(ctx, PR_1D_NUM_DUP_INODES, &pctx);
 481         shared = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
 482                                 sizeof(ext2_ino_t) * dict_count(&ino_dict),
 483                                 "Shared inode list");
 484         for (n = dict_first(&ino_dict); n; n = dict_next(&ino_dict, n)) {
 485                 p = (struct dup_inode *) dnode_get(n);
 486                 shared_len = 0;
 487                 file_ok = 1;
 488                 ino = (ext2_ino_t)VOIDPTR_TO_INT(dnode_getkey(n));
 489                 if (ino == EXT2_BAD_INO || ino == EXT2_RESIZE_INO)
 490                         continue;
 491
 492                 /*
 493                  * Find all of the inodes which share blocks with this
 494                  * one.  First we find all of the duplicate blocks
 495                  * belonging to this inode, and then search each block
 496                  * get the list of inodes, and merge them together.
 497                  */
 498                 for (s = p->cluster_list; s; s = s->next) {
 499                         m = dict_lookup(&clstr_dict,
 500                                         INT_TO_VOIDPTR(s->cluster));
 501                         if (!m)
 502                                 continue; /* Should never happen... */
 503                         q = (struct dup_cluster *) dnode_get(m);
 504                         if (q->num_bad > 1)
 505                                 file_ok = 0;
 506                         if (check_if_fs_cluster(ctx, s->cluster)) {
 507                                 file_ok = 0;
 508                                 meta_data = 1;
 509                         }
 510
 511                         /*
 512                          * Add all inodes used by this block to the
 513                          * shared[] --- which is a unique list, so
 514                          * if an inode is already in shared[], don't
 515                          * add it again.
 516                          */
 517                         for (r = q->inode_list; r; r = r->next) {
 518                                 if (r->inode == ino)
 519                                         continue;
 520                                 for (i = 0; i < shared_len; i++)
 521                                         if (shared[i] == r->inode)
 522                                                 break;
 523                                 if (i == shared_len) {
 524                                         shared[shared_len++] = r->inode;
 525                                 }
 526                         }
 527                 }
 528
 529                 /*
 530                  * Report the inode that we are working on
 531                  */
 532                 pctx.inode = &p->inode;
 533                 pctx.ino = ino;
 534                 pctx.dir = p->dir;
 535                 pctx.blkcount = p->num_dupblocks;
 536                 pctx.num = meta_data ? shared_len+1 : shared_len;
 537                 fix_problem(ctx, PR_1D_DUP_FILE, &pctx);
 538                 pctx.blkcount = 0;
 539                 pctx.num = 0;
 540
 541                 if (meta_data)
 542                         fix_problem(ctx, PR_1D_SHARE_METADATA, &pctx);
 543
 544                 for (i = 0; i < shared_len; i++) {
 545                         m = dict_lookup(&ino_dict, INT_TO_VOIDPTR(shared[i]));
 546                         if (!m)
 547                                 continue; /* should never happen */
 548                         t = (struct dup_inode *) dnode_get(m);
 549                         /*
 550                          * Report the inode that we are sharing with
 551                          */
 552                         pctx.inode = &t->inode;
 553                         pctx.ino = shared[i];
 554                         pctx.dir = t->dir;
 555                         fix_problem(ctx, PR_1D_DUP_FILE_LIST, &pctx);
 556                 }
 557                 /*
 558                  * Even if the file shares blocks with itself, we still need to
 559                  * clone the blocks.
 560                  */
 561                 if (file_ok && (meta_data ? shared_len+1 : shared_len) != 0) {
 562                         fix_problem(ctx, PR_1D_DUP_BLOCKS_DEALT, &pctx);
 563                         continue;
 564                 }
 565                 if (fix_problem(ctx, PR_1D_CLONE_QUESTION, &pctx)) {
 566                         pctx.errcode = clone_file(ctx, ino, p, block_buf);
 567                         if (pctx.errcode)
 568                                 fix_problem(ctx, PR_1D_CLONE_ERROR, &pctx);
 569                         else
 570                                 continue;
 571                 }
 572                 if (fix_problem(ctx, PR_1D_DELETE_QUESTION, &pctx))
 573                         delete_file(ctx, ino, p, block_buf);
 574                 else
 575                         ext2fs_unmark_valid(fs);
 576         }
 577         ext2fs_free_mem(&shared);
 578 }
 579
 580 /*
 581  * Drop the refcount on the dup_block structure, and clear the entry
 582  * in the block_dup_map if appropriate.
 583  */
 584 static void decrement_badcount(e2fsck_t ctx, blk64_t block,
 585                                struct dup_cluster *p)
 586 {
 587         p->num_bad--;
 588         if (p->num_bad <= 0 ||
 589             (p->num_bad == 1 && !check_if_fs_block(ctx, block))) {
 590                 if (check_if_fs_cluster(ctx, EXT2FS_B2C(ctx->fs, block)))
 591                         return;
 592                 ext2fs_unmark_block_bitmap2(ctx->block_dup_map, block);
 593         }
 594 }
 595
 596 static int delete_file_block(ext2_filsys fs,
 597                              blk64_t    *block_nr,
 598                              e2_blkcnt_t blockcnt,
 599                              blk64_t ref_block EXT2FS_ATTR((unused)),
 600                              int ref_offset EXT2FS_ATTR((unused)),
 601                              void *priv_data)
 602 {
 603         struct process_block_struct *pb;
 604         struct dup_cluster *p;
 605         dnode_t *n;
 606         e2fsck_t ctx;
 607         blk64_t c, lc;
 608
 609         pb = (struct process_block_struct *) priv_data;
 610         ctx = pb->ctx;
 611
 612         if (HOLE_BLKADDR(*block_nr))
 613                 return 0;
 614
 615         c = EXT2FS_B2C(fs, *block_nr);
 616         lc = EXT2FS_B2C(fs, blockcnt);
 617         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 618                 n = dict_lookup(&clstr_dict, INT_TO_VOIDPTR(c));
 619                 if (n) {
 620                         p = (struct dup_cluster *) dnode_get(n);
 621                         if (lc != pb->cur_cluster)
 622                                 decrement_badcount(ctx, *block_nr, p);
 623                 } else
 624                         com_err("delete_file_block", 0,
 625                             _("internal error: can't find dup_blk for %llu\n"),
 626                                 *block_nr);
 627         } else {
 628                 if ((*block_nr % EXT2FS_CLUSTER_RATIO(ctx->fs)) == 0)
 629                         ext2fs_block_alloc_stats2(fs, *block_nr, -1);
 630                 pb->dup_blocks++;
 631         }
 632         pb->cur_cluster = lc;
 633
 634         return 0;
 635 }
 636
 637 static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
 638                         struct dup_inode *dp, char* block_buf)
 639 {
 640         ext2_filsys fs = ctx->fs;
 641         struct process_block_struct pb;
 642         struct problem_context  pctx;
 643         unsigned int            count;
 644
 645         clear_problem_context(&pctx);
 646         pctx.ino = pb.ino = ino;
 647         pb.dup_blocks = 0;
 648         pb.ctx = ctx;
 649         pctx.str = "delete_file";
 650         pb.cur_cluster = ~0;
 651
 652         if (ext2fs_inode_has_valid_blocks2(fs, &dp->inode))
 653                 pctx.errcode = ext2fs_block_iterate3(fs, ino,
 654                                                      BLOCK_FLAG_READ_ONLY,
 655                                                      block_buf,
 656                                                      delete_file_block, &pb);
 657         if (pctx.errcode)
 658                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 659         if (ctx->inode_bad_map)
 660                 ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
 661         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(dp->inode.i_mode));
 662         quota_data_sub(ctx->qctx, &dp->inode, ino,
 663                        pb.dup_blocks * fs->blocksize);
 664         quota_data_inodes(ctx->qctx, &dp->inode, ino, -1);
 665
 666         /* Inode may have changed by block_iterate, so reread it */
 667         e2fsck_read_inode(ctx, ino, &dp->inode, "delete_file");
 668         e2fsck_clear_inode(ctx, ino, &dp->inode, 0, "delete_file");
 669         if (ext2fs_file_acl_block(fs, &dp->inode) &&
 670             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
 671                 count = 1;
 672                 pctx.errcode = ext2fs_adjust_ea_refcount2(fs,
 673                                         ext2fs_file_acl_block(fs, &dp->inode),
 674                                                    block_buf, -1, &count);
 675                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
 676                         pctx.errcode = 0;
 677                         count = 1;
 678                 }
 679                 if (pctx.errcode) {
 680                         pctx.blk = ext2fs_file_acl_block(fs, &dp->inode);
 681                         fix_problem(ctx, PR_1B_ADJ_EA_REFCOUNT, &pctx);
 682                 }
 683                 /*
 684                  * If the count is zero, then arrange to have the
 685                  * block deleted.  If the block is in the block_dup_map,
 686                  * also call delete_file_block since it will take care
 687                  * of keeping the accounting straight.
 688                  */
 689                 if ((count == 0) ||
 690                     ext2fs_test_block_bitmap2(ctx->block_dup_map,
 691                                         ext2fs_file_acl_block(fs, &dp->inode))) {
 692                         blk64_t blk = ext2fs_file_acl_block(fs, &dp->inode);
 693                         delete_file_block(fs, &blk,
 694                                           BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 695                         ext2fs_file_acl_block_set(fs, &dp->inode, blk);
 696                         quota_data_sub(ctx->qctx, &dp->inode, ino, fs->blocksize);
 697                 }
 698         }
 699 }
 700
 701 struct clone_struct {
 702         errcode_t       errcode;
 703         blk64_t         dup_cluster;
 704         blk64_t         alloc_block;
 705         ext2_ino_t      dir, ino;
 706         char    *buf;
 707         e2fsck_t ctx;
 708         struct ext2_inode       *inode;
 709 };
 710
 711 static int clone_file_block(ext2_filsys fs,
 712                             blk64_t     *block_nr,
 713                             e2_blkcnt_t blockcnt,
 714                             blk64_t ref_block EXT2FS_ATTR((unused)),
 715                             int ref_offset EXT2FS_ATTR((unused)),
 716                             void *priv_data)
 717 {
 718         struct dup_cluster *p;
 719         blk64_t new_block;
 720         errcode_t       retval;
 721         struct clone_struct *cs = (struct clone_struct *) priv_data;
 722         dnode_t *n;
 723         e2fsck_t ctx;
 724         blk64_t c;
 725         int is_meta = 0;
 726
 727         ctx = cs->ctx;
 728
 729         if (HOLE_BLKADDR(*block_nr))
 730                 return 0;
 731
 732         c = EXT2FS_B2C(fs, blockcnt);
 733         if (check_if_fs_cluster(ctx, EXT2FS_B2C(fs, *block_nr)))
 734                 is_meta = 1;
 735
 736         if (c == cs->dup_cluster && cs->alloc_block) {
 737                 new_block = cs->alloc_block;
 738                 goto got_block;
 739         }
 740
 741         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 742                 n = dict_lookup(&clstr_dict,
 743                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, *block_nr)));
 744                 if (!n) {
 745                         com_err("clone_file_block", 0,
 746                             _("internal error: can't find dup_blk for %llu\n"),
 747                                 *block_nr);
 748                         return 0;
 749                 }
 750
 751                 p = (struct dup_cluster *) dnode_get(n);
 752                 if (!is_meta)
 753                         decrement_badcount(ctx, *block_nr, p);
 754
 755                 cs->dup_cluster = c;
 756                 /*
 757                  * Let's try an implied cluster allocation.  If we get the same
 758                  * cluster back, then we need to find a new block; otherwise,
 759                  * we're merely fixing the problem of one logical cluster being
 760                  * mapped to multiple physical clusters.
 761                  */
 762                 new_block = 0;
 763                 retval = ext2fs_map_cluster_block(fs, cs->ino, cs->inode,
 764                                                   blockcnt, &new_block);
 765                 if (retval == 0 && new_block != 0 &&
 766                     EXT2FS_B2C(ctx->fs, new_block) !=
 767                     EXT2FS_B2C(ctx->fs, *block_nr))
 768                         goto cluster_alloc_ok;
 769                 retval = ext2fs_new_block2(fs, 0, ctx->block_found_map,
 770                                            &new_block);
 771                 if (retval) {
 772                         cs->errcode = retval;
 773                         return BLOCK_ABORT;
 774                 }
 775 cluster_alloc_ok:
 776                 cs->alloc_block = new_block;
 777
 778         got_block:
 779                 new_block &= ~EXT2FS_CLUSTER_MASK(fs);
 780                 new_block += EXT2FS_CLUSTER_MASK(fs) & blockcnt;
 781                 if (cs->dir && (blockcnt >= 0)) {
 782                         retval = ext2fs_set_dir_block2(fs->dblist,
 783                                         cs->dir, new_block, blockcnt);
 784                         if (retval) {
 785                                 cs->errcode = retval;
 786                                 return BLOCK_ABORT;
 787                         }
 788                 }
 789 #if 0
 790                 printf("Cloning block #%lld from %llu to %llu\n",
 791                        blockcnt, *block_nr, new_block);
 792 #endif
 793                 retval = io_channel_read_blk64(fs->io, *block_nr, 1, cs->buf);
 794                 if (retval) {
 795                         cs->errcode = retval;
 796                         return BLOCK_ABORT;
 797                 }
 798                 retval = io_channel_write_blk64(fs->io, new_block, 1, cs->buf);
 799                 if (retval) {
 800                         cs->errcode = retval;
 801                         return BLOCK_ABORT;
 802                 }
 803                 *block_nr = new_block;
 804                 ext2fs_mark_block_bitmap2(ctx->block_found_map, new_block);
 805                 ext2fs_mark_block_bitmap2(fs->block_map, new_block);
 806                 return BLOCK_CHANGED;
 807         }
 808         return 0;
 809 }
 810
 811 static errcode_t clone_file(e2fsck_t ctx, ext2_ino_t ino,
 812                             struct dup_inode *dp, char* block_buf)
 813 {
 814         ext2_filsys fs = ctx->fs;
 815         errcode_t       retval;
 816         struct clone_struct cs;
 817         struct problem_context  pctx;
 818         blk64_t         blk, new_blk;
 819         dnode_t         *n;
 820         struct inode_el *ino_el;
 821         struct dup_cluster      *dc;
 822         struct dup_inode        *di;
 823
 824         clear_problem_context(&pctx);
 825         cs.errcode = 0;
 826         cs.dir = 0;
 827         cs.dup_cluster = ~0;
 828         cs.alloc_block = 0;
 829         cs.ctx = ctx;
 830         cs.ino = ino;
 831         cs.inode = &dp->inode;
 832         retval = ext2fs_get_mem(fs->blocksize, &cs.buf);
 833         if (retval)
 834                 return retval;
 835
 836         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, ino))
 837                 cs.dir = ino;
 838
 839         pctx.ino = ino;
 840         pctx.str = "clone_file";
 841         if (ext2fs_inode_has_valid_blocks2(fs, &dp->inode))
 842                 pctx.errcode = ext2fs_block_iterate3(fs, ino, 0, block_buf,
 843                                                      clone_file_block, &cs);
 844         ext2fs_mark_bb_dirty(fs);
 845         if (pctx.errcode) {
 846                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 847                 retval = pctx.errcode;
 848                 goto errout;
 849         }
 850         if (cs.errcode) {
 851                 com_err("clone_file", cs.errcode, "%s",
 852                         _("returned from clone_file_block"));
 853                 retval = cs.errcode;
 854                 goto errout;
 855         }
 856         /* The inode may have changed on disk, so we have to re-read it */
 857         e2fsck_read_inode(ctx, ino, &dp->inode, "clone file EA");
 858         blk = ext2fs_file_acl_block(fs, &dp->inode);
 859         new_blk = blk;
 860         if (blk && (clone_file_block(fs, &new_blk,
 861                                      BLOCK_COUNT_EXTATTR, 0, 0, &cs) ==
 862                     BLOCK_CHANGED)) {
 863                 ext2fs_file_acl_block_set(fs, &dp->inode, new_blk);
 864                 e2fsck_write_inode(ctx, ino, &dp->inode, "clone file EA");
 865                 /*
 866                  * If we cloned the EA block, find all other inodes
 867                  * which refered to that EA block, and modify
 868                  * them to point to the new EA block.
 869                  */
 870                 n = dict_lookup(&clstr_dict,
 871                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, blk)));
 872                 if (!n) {
 873                         com_err("clone_file", 0,
 874                                 _("internal error: couldn't lookup EA "
 875                                   "block record for %llu"), blk);
 876                         retval = 0; /* OK to stumble on... */
 877                         goto errout;
 878                 }
 879                 dc = (struct dup_cluster *) dnode_get(n);
 880                 for (ino_el = dc->inode_list; ino_el; ino_el = ino_el->next) {
 881                         if (ino_el->inode == ino)
 882                                 continue;
 883                         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(ino_el->inode));
 884                         if (!n) {
 885                                 com_err("clone_file", 0,
 886                                         _("internal error: couldn't lookup EA "
 887                                           "inode record for %u"),
 888                                         ino_el->inode);
 889                                 retval = 0; /* OK to stumble on... */
 890                                 goto errout;
 891                         }
 892                         di = (struct dup_inode *) dnode_get(n);
 893                         if (ext2fs_file_acl_block(fs, &di->inode) == blk) {
 894                                 ext2fs_file_acl_block_set(fs, &di->inode,
 895                                         ext2fs_file_acl_block(fs, &dp->inode));
 896                                 e2fsck_write_inode(ctx, ino_el->inode,
 897                                            &di->inode, "clone file EA");
 898                                 decrement_badcount(ctx, blk, dc);
 899                         }
 900                 }
 901         }
 902         retval = 0;
 903 errout:
 904         ext2fs_free_mem(&cs.buf);
 905         return retval;
 906 }
 907
 908 /*
 909  * This routine returns 1 if a block overlaps with one of the superblocks,
 910  * group descriptors, inode bitmaps, or block bitmaps.
 911  */
 912 static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block)
 913 {
 914         ext2_filsys fs = ctx->fs;
 915         blk64_t first_block;
 916         dgrp_t  i;
 917
 918         first_block = fs->super->s_first_data_block;
 919         for (i = 0; i < fs->group_desc_count; i++) {
 920
 921                 /* Check superblocks/block group descriptors */
 922                 if (ext2fs_bg_has_super(fs, i)) {
 923                         if (test_block >= first_block &&
 924                             (test_block <= first_block + fs->desc_blocks))
 925                                 return 1;
 926                 }
 927
 928                 /* Check the inode table */
 929                 if ((ext2fs_inode_table_loc(fs, i)) &&
 930                     (test_block >= ext2fs_inode_table_loc(fs, i)) &&
 931                     (test_block < (ext2fs_inode_table_loc(fs, i) +
 932                                    fs->inode_blocks_per_group)))
 933                         return 1;
 934
 935                 /* Check the bitmap blocks */
 936                 if ((test_block == ext2fs_block_bitmap_loc(fs, i)) ||
 937                     (test_block == ext2fs_inode_bitmap_loc(fs, i)))
 938                         return 1;
 939
 940                 first_block += fs->super->s_blocks_per_group;
 941         }
 942         return 0;
 943 }
 944
 945 /*
 946  * This routine returns 1 if a cluster overlaps with one of the superblocks,
 947  * group descriptors, inode bitmaps, or block bitmaps.
 948  */
 949 static int check_if_fs_cluster(e2fsck_t ctx, blk64_t cluster)
 950 {
 951         ext2_filsys fs = ctx->fs;
 952         blk64_t first_block;
 953         dgrp_t  i;
 954
 955         first_block = fs->super->s_first_data_block;
 956         for (i = 0; i < fs->group_desc_count; i++) {
 957
 958                 /* Check superblocks/block group descriptors */
 959                 if (ext2fs_bg_has_super(fs, i)) {
 960                         if (cluster >= EXT2FS_B2C(fs, first_block) &&
 961                             (cluster <= EXT2FS_B2C(fs, first_block +
 962                                                    fs->desc_blocks)))
 963                                 return 1;
 964                 }
 965
 966                 /* Check the inode table */
 967                 if ((ext2fs_inode_table_loc(fs, i)) &&
 968                     (cluster >= EXT2FS_B2C(fs,
 969                                            ext2fs_inode_table_loc(fs, i))) &&
 970                     (cluster <= EXT2FS_B2C(fs,
 971                                            ext2fs_inode_table_loc(fs, i) +
 972                                            fs->inode_blocks_per_group - 1)))
 973                         return 1;
 974
 975                 /* Check the bitmap blocks */
 976                 if ((cluster == EXT2FS_B2C(fs,
 977                                            ext2fs_block_bitmap_loc(fs, i))) ||
 978                     (cluster == EXT2FS_B2C(fs,
 979                                            ext2fs_inode_bitmap_loc(fs, i))))
 980                         return 1;
 981
 982                 first_block += fs->super->s_blocks_per_group;
 983         }
 984         return 0;
 985 }