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         blk64_t         last_blk;
 266         struct ext2_inode *inode;
 267         struct problem_context *pctx;
 268 };
 269
 270 static void pass1b(e2fsck_t ctx, char *block_buf)
 271 {
 272         ext2_filsys fs = ctx->fs;
 273         ext2_ino_t ino = 0;
 274         struct ext2_inode inode;
 275         ext2_inode_scan scan;
 276         struct process_block_struct pb;
 277         struct problem_context pctx;
 278         problem_t op;
 279
 280         clear_problem_context(&pctx);
 281
 282         if (!(ctx->options & E2F_OPT_PREEN))
 283                 fix_problem(ctx, PR_1B_PASS_HEADER, &pctx);
 284         pctx.errcode = ext2fs_open_inode_scan(fs, ctx->inode_buffer_blocks,
 285                                               &scan);
 286         if (pctx.errcode) {
 287                 fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
 288                 ctx->flags |= E2F_FLAG_ABORT;
 289                 return;
 290         }
 291         ctx->stashed_inode = &inode;
 292         pb.ctx = ctx;
 293         pb.pctx = &pctx;
 294         pctx.str = "pass1b";
 295         while (1) {
 296                 if (ino % (fs->super->s_inodes_per_group * 4) == 1) {
 297                         if (e2fsck_mmp_update(fs))
 298                                 fatal_error(ctx, 0);
 299                 }
 300                 pctx.errcode = ext2fs_get_next_inode(scan, &ino, &inode);
 301                 if (pctx.errcode == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
 302                         continue;
 303                 if (pctx.errcode) {
 304                         pctx.ino = ino;
 305                         fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
 306                         ctx->flags |= E2F_FLAG_ABORT;
 307                         return;
 308                 }
 309                 if (!ino)
 310                         break;
 311                 pctx.ino = ctx->stashed_ino = ino;
 312                 if ((ino != EXT2_BAD_INO) &&
 313                     !ext2fs_test_inode_bitmap2(ctx->inode_used_map, ino))
 314                         continue;
 315
 316                 pb.ino = ino;
 317                 pb.dup_blocks = 0;
 318                 pb.inode = &inode;
 319                 pb.cur_cluster = ~0;
 320                 pb.phys_cluster = ~0;
 321                 pb.last_blk = 0;
 322                 pb.pctx->blk = pb.pctx->blk2 = 0;
 323
 324                 if (ext2fs_inode_has_valid_blocks2(fs, &inode) ||
 325                     (ino == EXT2_BAD_INO))
 326                         pctx.errcode = ext2fs_block_iterate3(fs, ino,
 327                                              BLOCK_FLAG_READ_ONLY, block_buf,
 328                                              process_pass1b_block, &pb);
 329                 /* If the feature is not set, attrs will be cleared later anyway */
 330                 if ((fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR) &&
 331                     ext2fs_file_acl_block(fs, &inode)) {
 332                         blk64_t blk = ext2fs_file_acl_block(fs, &inode);
 333                         process_pass1b_block(fs, &blk,
 334                                              BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 335                         ext2fs_file_acl_block_set(fs, &inode, blk);
 336                 }
 337                 if (pb.dup_blocks) {
 338                         if (ino != EXT2_BAD_INO) {
 339                                 op = pctx.blk == pctx.blk2 ?
 340                                         PR_1B_DUP_BLOCK : PR_1B_DUP_RANGE;
 341                                 fix_problem(ctx, op, pb.pctx);
 342                         }
 343                         end_problem_latch(ctx, PR_LATCH_DBLOCK);
 344                         if (ino >= EXT2_FIRST_INODE(fs->super) ||
 345                             ino == EXT2_ROOT_INO)
 346                                 dup_inode_count++;
 347                 }
 348                 if (pctx.errcode)
 349                         fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 350         }
 351         ext2fs_close_inode_scan(scan);
 352         e2fsck_use_inode_shortcuts(ctx, 0);
 353 }
 354
 355 static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
 356                                 blk64_t *block_nr,
 357                                 e2_blkcnt_t blockcnt,
 358                                 blk64_t ref_blk EXT2FS_ATTR((unused)),
 359                                 int ref_offset EXT2FS_ATTR((unused)),
 360                                 void *priv_data)
 361 {
 362         struct process_block_struct *p;
 363         e2fsck_t ctx;
 364         blk64_t lc, pc;
 365         problem_t op;
 366
 367         if (HOLE_BLKADDR(*block_nr))
 368                 return 0;
 369         p = (struct process_block_struct *) priv_data;
 370         ctx = p->ctx;
 371         lc = EXT2FS_B2C(fs, blockcnt);
 372         pc = EXT2FS_B2C(fs, *block_nr);
 373
 374         if (!ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr))
 375                 goto finish;
 376
 377         /* OK, this is a duplicate block */
 378         if (p->ino != EXT2_BAD_INO) {
 379                 if (p->last_blk + 1 != *block_nr) {
 380                         if (p->last_blk) {
 381                                 op = p->pctx->blk == p->pctx->blk2 ?
 382                                                 PR_1B_DUP_BLOCK :
 383                                                 PR_1B_DUP_RANGE;
 384                                 fix_problem(ctx, op, p->pctx);
 385                         }
 386                         p->pctx->blk = *block_nr;
 387                 }
 388                 p->pctx->blk2 = *block_nr;
 389                 p->last_blk = *block_nr;
 390         }
 391         p->dup_blocks++;
 392         ext2fs_mark_inode_bitmap2(inode_dup_map, p->ino);
 393
 394         /*
 395          * Qualifications for submitting a block for duplicate processing:
 396          * It's an extent/indirect block (and has a negative logical offset);
 397          * we've crossed a logical cluster boundary; or the physical cluster
 398          * suddenly changed, which indicates that blocks in a logical cluster
 399          * are mapped to multiple physical clusters.
 400          */
 401         if (blockcnt < 0 || lc != p->cur_cluster || pc != p->phys_cluster)
 402                 add_dupe(ctx, p->ino, EXT2FS_B2C(fs, *block_nr), p->inode);
 403
 404 finish:
 405         p->cur_cluster = lc;
 406         p->phys_cluster = pc;
 407         return 0;
 408 }
 409
 410 /*
 411  * Pass 1c: Scan directories for inodes with duplicate blocks.  This
 412  * is used so that we can print pathnames when prompting the user for
 413  * what to do.
 414  */
 415 struct search_dir_struct {
 416         int             count;
 417         ext2_ino_t      first_inode;
 418         ext2_ino_t      max_inode;
 419 };
 420
 421 static int search_dirent_proc(ext2_ino_t dir, int entry,
 422                               struct ext2_dir_entry *dirent,
 423                               int offset EXT2FS_ATTR((unused)),
 424                               int blocksize EXT2FS_ATTR((unused)),
 425                               char *buf EXT2FS_ATTR((unused)),
 426                               void *priv_data)
 427 {
 428         struct search_dir_struct *sd;
 429         struct dup_inode        *p;
 430         dnode_t                 *n;
 431
 432         sd = (struct search_dir_struct *) priv_data;
 433
 434         if (dirent->inode > sd->max_inode)
 435                 /* Should abort this inode, but not everything */
 436                 return 0;
 437
 438         if ((dirent->inode < sd->first_inode) || (entry < DIRENT_OTHER_FILE) ||
 439             !ext2fs_test_inode_bitmap2(inode_dup_map, dirent->inode))
 440                 return 0;
 441
 442         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(dirent->inode));
 443         if (!n)
 444                 return 0;
 445         p = (struct dup_inode *) dnode_get(n);
 446         if (!p->dir) {
 447                 p->dir = dir;
 448                 sd->count--;
 449         }
 450
 451         return(sd->count ? 0 : DIRENT_ABORT);
 452 }
 453
 454
 455 static void pass1c(e2fsck_t ctx, char *block_buf)
 456 {
 457         ext2_filsys fs = ctx->fs;
 458         struct search_dir_struct sd;
 459         struct problem_context pctx;
 460
 461         clear_problem_context(&pctx);
 462
 463         if (!(ctx->options & E2F_OPT_PREEN))
 464                 fix_problem(ctx, PR_1C_PASS_HEADER, &pctx);
 465
 466         /*
 467          * Search through all directories to translate inodes to names
 468          * (by searching for the containing directory for that inode.)
 469          */
 470         sd.count = dup_inode_count - dup_inode_founddir;
 471         sd.first_inode = EXT2_FIRST_INODE(fs->super);
 472         sd.max_inode = fs->super->s_inodes_count;
 473         ext2fs_dblist_dir_iterate(fs->dblist, 0, block_buf,
 474                                   search_dirent_proc, &sd);
 475 }
 476
 477 static void pass1d(e2fsck_t ctx, char *block_buf)
 478 {
 479         ext2_filsys fs = ctx->fs;
 480         struct dup_inode        *p, *t;
 481         struct dup_cluster      *q;
 482         ext2_ino_t              *shared, ino;
 483         int     shared_len;
 484         int     i;
 485         int     file_ok;
 486         int     meta_data = 0;
 487         struct problem_context pctx;
 488         dnode_t *n, *m;
 489         struct cluster_el       *s;
 490         struct inode_el *r;
 491
 492         clear_problem_context(&pctx);
 493
 494         if (!(ctx->options & E2F_OPT_PREEN))
 495                 fix_problem(ctx, PR_1D_PASS_HEADER, &pctx);
 496         e2fsck_read_bitmaps(ctx);
 497
 498         pctx.num = dup_inode_count; /* dict_count(&ino_dict); */
 499         fix_problem(ctx, PR_1D_NUM_DUP_INODES, &pctx);
 500         shared = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
 501                                 sizeof(ext2_ino_t) * dict_count(&ino_dict),
 502                                 "Shared inode list");
 503         for (n = dict_first(&ino_dict); n; n = dict_next(&ino_dict, n)) {
 504                 p = (struct dup_inode *) dnode_get(n);
 505                 shared_len = 0;
 506                 file_ok = 1;
 507                 ino = (ext2_ino_t)VOIDPTR_TO_INT(dnode_getkey(n));
 508                 if (ino == EXT2_BAD_INO || ino == EXT2_RESIZE_INO)
 509                         continue;
 510
 511                 /*
 512                  * Find all of the inodes which share blocks with this
 513                  * one.  First we find all of the duplicate blocks
 514                  * belonging to this inode, and then search each block
 515                  * get the list of inodes, and merge them together.
 516                  */
 517                 for (s = p->cluster_list; s; s = s->next) {
 518                         m = dict_lookup(&clstr_dict,
 519                                         INT_TO_VOIDPTR(s->cluster));
 520                         if (!m)
 521                                 continue; /* Should never happen... */
 522                         q = (struct dup_cluster *) dnode_get(m);
 523                         if (q->num_bad > 1)
 524                                 file_ok = 0;
 525                         if (check_if_fs_cluster(ctx, s->cluster)) {
 526                                 file_ok = 0;
 527                                 meta_data = 1;
 528                         }
 529
 530                         /*
 531                          * Add all inodes used by this block to the
 532                          * shared[] --- which is a unique list, so
 533                          * if an inode is already in shared[], don't
 534                          * add it again.
 535                          */
 536                         for (r = q->inode_list; r; r = r->next) {
 537                                 if (r->inode == ino)
 538                                         continue;
 539                                 for (i = 0; i < shared_len; i++)
 540                                         if (shared[i] == r->inode)
 541                                                 break;
 542                                 if (i == shared_len) {
 543                                         shared[shared_len++] = r->inode;
 544                                 }
 545                         }
 546                 }
 547
 548                 /*
 549                  * Report the inode that we are working on
 550                  */
 551                 pctx.inode = &p->inode;
 552                 pctx.ino = ino;
 553                 pctx.dir = p->dir;
 554                 pctx.blkcount = p->num_dupblocks;
 555                 pctx.num = meta_data ? shared_len+1 : shared_len;
 556                 fix_problem(ctx, PR_1D_DUP_FILE, &pctx);
 557                 pctx.blkcount = 0;
 558                 pctx.num = 0;
 559
 560                 if (meta_data)
 561                         fix_problem(ctx, PR_1D_SHARE_METADATA, &pctx);
 562
 563                 for (i = 0; i < shared_len; i++) {
 564                         m = dict_lookup(&ino_dict, INT_TO_VOIDPTR(shared[i]));
 565                         if (!m)
 566                                 continue; /* should never happen */
 567                         t = (struct dup_inode *) dnode_get(m);
 568                         /*
 569                          * Report the inode that we are sharing with
 570                          */
 571                         pctx.inode = &t->inode;
 572                         pctx.ino = shared[i];
 573                         pctx.dir = t->dir;
 574                         fix_problem(ctx, PR_1D_DUP_FILE_LIST, &pctx);
 575                 }
 576                 /*
 577                  * Even if the file shares blocks with itself, we still need to
 578                  * clone the blocks.
 579                  */
 580                 if (file_ok && (meta_data ? shared_len+1 : shared_len) != 0) {
 581                         fix_problem(ctx, PR_1D_DUP_BLOCKS_DEALT, &pctx);
 582                         continue;
 583                 }
 584                 if (fix_problem(ctx, PR_1D_CLONE_QUESTION, &pctx)) {
 585                         pctx.errcode = clone_file(ctx, ino, p, block_buf);
 586                         if (pctx.errcode)
 587                                 fix_problem(ctx, PR_1D_CLONE_ERROR, &pctx);
 588                         else
 589                                 continue;
 590                 }
 591                 if (fix_problem(ctx, PR_1D_DELETE_QUESTION, &pctx))
 592                         delete_file(ctx, ino, p, block_buf);
 593                 else
 594                         ext2fs_unmark_valid(fs);
 595         }
 596         ext2fs_free_mem(&shared);
 597 }
 598
 599 /*
 600  * Drop the refcount on the dup_block structure, and clear the entry
 601  * in the block_dup_map if appropriate.
 602  */
 603 static void decrement_badcount(e2fsck_t ctx, blk64_t block,
 604                                struct dup_cluster *p)
 605 {
 606         p->num_bad--;
 607         if (p->num_bad <= 0 ||
 608             (p->num_bad == 1 && !check_if_fs_block(ctx, block))) {
 609                 if (check_if_fs_cluster(ctx, EXT2FS_B2C(ctx->fs, block)))
 610                         return;
 611                 ext2fs_unmark_block_bitmap2(ctx->block_dup_map, block);
 612         }
 613 }
 614
 615 static int delete_file_block(ext2_filsys fs,
 616                              blk64_t    *block_nr,
 617                              e2_blkcnt_t blockcnt,
 618                              blk64_t ref_block EXT2FS_ATTR((unused)),
 619                              int ref_offset EXT2FS_ATTR((unused)),
 620                              void *priv_data)
 621 {
 622         struct process_block_struct *pb;
 623         struct dup_cluster *p;
 624         dnode_t *n;
 625         e2fsck_t ctx;
 626         blk64_t c, lc;
 627
 628         pb = (struct process_block_struct *) priv_data;
 629         ctx = pb->ctx;
 630
 631         if (HOLE_BLKADDR(*block_nr))
 632                 return 0;
 633
 634         c = EXT2FS_B2C(fs, *block_nr);
 635         lc = EXT2FS_B2C(fs, blockcnt);
 636         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 637                 n = dict_lookup(&clstr_dict, INT_TO_VOIDPTR(c));
 638                 if (n) {
 639                         p = (struct dup_cluster *) dnode_get(n);
 640                         if (lc != pb->cur_cluster)
 641                                 decrement_badcount(ctx, *block_nr, p);
 642                 } else
 643                         com_err("delete_file_block", 0,
 644                             _("internal error: can't find dup_blk for %llu\n"),
 645                                 *block_nr);
 646         } else {
 647                 if ((*block_nr % EXT2FS_CLUSTER_RATIO(ctx->fs)) == 0)
 648                         ext2fs_block_alloc_stats2(fs, *block_nr, -1);
 649                 pb->dup_blocks++;
 650         }
 651         pb->cur_cluster = lc;
 652
 653         return 0;
 654 }
 655
 656 static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
 657                         struct dup_inode *dp, char* block_buf)
 658 {
 659         ext2_filsys fs = ctx->fs;
 660         struct process_block_struct pb;
 661         struct problem_context  pctx;
 662         unsigned int            count;
 663
 664         clear_problem_context(&pctx);
 665         pctx.ino = pb.ino = ino;
 666         pb.dup_blocks = 0;
 667         pb.ctx = ctx;
 668         pctx.str = "delete_file";
 669         pb.cur_cluster = ~0;
 670
 671         if (ext2fs_inode_has_valid_blocks2(fs, &dp->inode))
 672                 pctx.errcode = ext2fs_block_iterate3(fs, ino,
 673                                                      BLOCK_FLAG_READ_ONLY,
 674                                                      block_buf,
 675                                                      delete_file_block, &pb);
 676         if (pctx.errcode)
 677                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 678         if (ctx->inode_bad_map)
 679                 ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
 680         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(dp->inode.i_mode));
 681         quota_data_sub(ctx->qctx, &dp->inode, ino,
 682                        pb.dup_blocks * fs->blocksize);
 683         quota_data_inodes(ctx->qctx, &dp->inode, ino, -1);
 684
 685         /* Inode may have changed by block_iterate, so reread it */
 686         e2fsck_read_inode(ctx, ino, &dp->inode, "delete_file");
 687         e2fsck_clear_inode(ctx, ino, &dp->inode, 0, "delete_file");
 688         if (ext2fs_file_acl_block(fs, &dp->inode) &&
 689             (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
 690                 count = 1;
 691                 pctx.errcode = ext2fs_adjust_ea_refcount3(fs,
 692                                         ext2fs_file_acl_block(fs, &dp->inode),
 693                                         block_buf, -1, &count, ino);
 694                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
 695                         pctx.errcode = 0;
 696                         count = 1;
 697                 }
 698                 if (pctx.errcode) {
 699                         pctx.blk = ext2fs_file_acl_block(fs, &dp->inode);
 700                         fix_problem(ctx, PR_1B_ADJ_EA_REFCOUNT, &pctx);
 701                 }
 702                 /*
 703                  * If the count is zero, then arrange to have the
 704                  * block deleted.  If the block is in the block_dup_map,
 705                  * also call delete_file_block since it will take care
 706                  * of keeping the accounting straight.
 707                  */
 708                 if ((count == 0) ||
 709                     ext2fs_test_block_bitmap2(ctx->block_dup_map,
 710                                         ext2fs_file_acl_block(fs, &dp->inode))) {
 711                         blk64_t blk = ext2fs_file_acl_block(fs, &dp->inode);
 712                         delete_file_block(fs, &blk,
 713                                           BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 714                         ext2fs_file_acl_block_set(fs, &dp->inode, blk);
 715                         quota_data_sub(ctx->qctx, &dp->inode, ino, fs->blocksize);
 716                 }
 717         }
 718 }
 719
 720 struct clone_struct {
 721         errcode_t       errcode;
 722         blk64_t         dup_cluster;
 723         blk64_t         alloc_block;
 724         ext2_ino_t      dir, ino;
 725         char    *buf;
 726         e2fsck_t ctx;
 727         struct ext2_inode       *inode;
 728
 729         struct dup_cluster *save_dup_cluster;
 730         blk64_t save_blocknr;
 731 };
 732
 733 /*
 734  * Decrement the bad count *after* we've shown that (a) we can allocate a
 735  * replacement block and (b) remap the file blocks.  Unfortunately, there's no
 736  * way to find out if the remap succeeded until either the next
 737  * clone_file_block() call (an error when remapping the block after returning
 738  * BLOCK_CHANGED will halt the iteration) or after block_iterate() returns.
 739  * Otherwise, it's possible that we decrease the badcount once in preparation
 740  * to remap, then the remap fails (either we can't find a replacement block or
 741  * we have to split the extent tree and can't find a new extent block), so we
 742  * delete the file, which decreases the badcount again.
 743  */
 744 static void deferred_dec_badcount(struct clone_struct *cs)
 745 {
 746         if (!cs->save_dup_cluster)
 747                 return;
 748         decrement_badcount(cs->ctx, cs->save_blocknr, cs->save_dup_cluster);
 749         cs->save_dup_cluster = NULL;
 750 }
 751
 752 static int clone_file_block(ext2_filsys fs,
 753                             blk64_t     *block_nr,
 754                             e2_blkcnt_t blockcnt,
 755                             blk64_t ref_block EXT2FS_ATTR((unused)),
 756                             int ref_offset EXT2FS_ATTR((unused)),
 757                             void *priv_data)
 758 {
 759         struct dup_cluster *p = NULL;
 760         blk64_t new_block;
 761         errcode_t       retval;
 762         struct clone_struct *cs = (struct clone_struct *) priv_data;
 763         dnode_t *n;
 764         e2fsck_t ctx;
 765         blk64_t c;
 766         int is_meta = 0;
 767
 768         ctx = cs->ctx;
 769         deferred_dec_badcount(cs);
 770
 771         if (HOLE_BLKADDR(*block_nr))
 772                 return 0;
 773
 774         c = EXT2FS_B2C(fs, blockcnt);
 775         if (check_if_fs_cluster(ctx, EXT2FS_B2C(fs, *block_nr)))
 776                 is_meta = 1;
 777
 778         if (c == cs->dup_cluster && cs->alloc_block) {
 779                 new_block = cs->alloc_block;
 780                 goto got_block;
 781         }
 782
 783         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 784                 n = dict_lookup(&clstr_dict,
 785                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, *block_nr)));
 786                 if (!n) {
 787                         com_err("clone_file_block", 0,
 788                             _("internal error: can't find dup_blk for %llu\n"),
 789                                 *block_nr);
 790                         return 0;
 791                 }
 792
 793                 p = (struct dup_cluster *) dnode_get(n);
 794
 795                 cs->dup_cluster = c;
 796                 /*
 797                  * Let's try an implied cluster allocation.  If we get the same
 798                  * cluster back, then we need to find a new block; otherwise,
 799                  * we're merely fixing the problem of one logical cluster being
 800                  * mapped to multiple physical clusters.
 801                  */
 802                 new_block = 0;
 803                 retval = ext2fs_map_cluster_block(fs, cs->ino, cs->inode,
 804                                                   blockcnt, &new_block);
 805                 if (retval == 0 && new_block != 0 &&
 806                     EXT2FS_B2C(ctx->fs, new_block) !=
 807                     EXT2FS_B2C(ctx->fs, *block_nr))
 808                         goto cluster_alloc_ok;
 809                 retval = ext2fs_new_block2(fs, 0, ctx->block_found_map,
 810                                            &new_block);
 811                 if (retval) {
 812                         cs->errcode = retval;
 813                         return BLOCK_ABORT;
 814                 }
 815 cluster_alloc_ok:
 816                 cs->alloc_block = new_block;
 817
 818         got_block:
 819                 new_block &= ~EXT2FS_CLUSTER_MASK(fs);
 820                 new_block += EXT2FS_CLUSTER_MASK(fs) & blockcnt;
 821                 if (cs->dir && (blockcnt >= 0)) {
 822                         retval = ext2fs_set_dir_block2(fs->dblist,
 823                                         cs->dir, new_block, blockcnt);
 824                         if (retval) {
 825                                 cs->errcode = retval;
 826                                 return BLOCK_ABORT;
 827                         }
 828                 }
 829 #if 0
 830                 printf("Cloning block #%lld from %llu to %llu\n",
 831                        blockcnt, *block_nr, new_block);
 832 #endif
 833                 retval = io_channel_read_blk64(fs->io, *block_nr, 1, cs->buf);
 834                 if (retval) {
 835                         cs->errcode = retval;
 836                         return BLOCK_ABORT;
 837                 }
 838                 retval = io_channel_write_blk64(fs->io, new_block, 1, cs->buf);
 839                 if (retval) {
 840                         cs->errcode = retval;
 841                         return BLOCK_ABORT;
 842                 }
 843                 cs->save_dup_cluster = (is_meta ? NULL : p);
 844                 cs->save_blocknr = *block_nr;
 845                 *block_nr = new_block;
 846                 ext2fs_mark_block_bitmap2(ctx->block_found_map, new_block);
 847                 ext2fs_mark_block_bitmap2(fs->block_map, new_block);
 848                 return BLOCK_CHANGED;
 849         }
 850         return 0;
 851 }
 852
 853 static errcode_t clone_file(e2fsck_t ctx, ext2_ino_t ino,
 854                             struct dup_inode *dp, char* block_buf)
 855 {
 856         ext2_filsys fs = ctx->fs;
 857         errcode_t       retval;
 858         struct clone_struct cs;
 859         struct problem_context  pctx;
 860         blk64_t         blk, new_blk;
 861         dnode_t         *n;
 862         struct inode_el *ino_el;
 863         struct dup_cluster      *dc;
 864         struct dup_inode        *di;
 865
 866         clear_problem_context(&pctx);
 867         cs.errcode = 0;
 868         cs.dir = 0;
 869         cs.dup_cluster = ~0;
 870         cs.alloc_block = 0;
 871         cs.ctx = ctx;
 872         cs.ino = ino;
 873         cs.inode = &dp->inode;
 874         cs.save_dup_cluster = NULL;
 875         cs.save_blocknr = 0;
 876         retval = ext2fs_get_mem(fs->blocksize, &cs.buf);
 877         if (retval)
 878                 return retval;
 879
 880         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, ino))
 881                 cs.dir = ino;
 882
 883         pctx.ino = ino;
 884         pctx.str = "clone_file";
 885         if (ext2fs_inode_has_valid_blocks2(fs, &dp->inode))
 886                 pctx.errcode = ext2fs_block_iterate3(fs, ino, 0, block_buf,
 887                                                      clone_file_block, &cs);
 888         deferred_dec_badcount(&cs);
 889         ext2fs_mark_bb_dirty(fs);
 890         if (pctx.errcode) {
 891                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 892                 retval = pctx.errcode;
 893                 goto errout;
 894         }
 895         if (cs.errcode) {
 896                 com_err("clone_file", cs.errcode, "%s",
 897                         _("returned from clone_file_block"));
 898                 retval = cs.errcode;
 899                 goto errout;
 900         }
 901         /* The inode may have changed on disk, so we have to re-read it */
 902         e2fsck_read_inode(ctx, ino, &dp->inode, "clone file EA");
 903         blk = ext2fs_file_acl_block(fs, &dp->inode);
 904         new_blk = blk;
 905         if (blk && (clone_file_block(fs, &new_blk,
 906                                      BLOCK_COUNT_EXTATTR, 0, 0, &cs) ==
 907                     BLOCK_CHANGED)) {
 908                 ext2fs_file_acl_block_set(fs, &dp->inode, new_blk);
 909                 e2fsck_write_inode(ctx, ino, &dp->inode, "clone file EA");
 910                 /*
 911                  * If we cloned the EA block, find all other inodes
 912                  * which refered to that EA block, and modify
 913                  * them to point to the new EA block.
 914                  */
 915                 n = dict_lookup(&clstr_dict,
 916                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, blk)));
 917                 if (!n) {
 918                         com_err("clone_file", 0,
 919                                 _("internal error: couldn't lookup EA "
 920                                   "block record for %llu"), blk);
 921                         retval = 0; /* OK to stumble on... */
 922                         goto errout;
 923                 }
 924                 dc = (struct dup_cluster *) dnode_get(n);
 925                 for (ino_el = dc->inode_list; ino_el; ino_el = ino_el->next) {
 926                         if (ino_el->inode == ino)
 927                                 continue;
 928                         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(ino_el->inode));
 929                         if (!n) {
 930                                 com_err("clone_file", 0,
 931                                         _("internal error: couldn't lookup EA "
 932                                           "inode record for %u"),
 933                                         ino_el->inode);
 934                                 retval = 0; /* OK to stumble on... */
 935                                 goto errout;
 936                         }
 937                         di = (struct dup_inode *) dnode_get(n);
 938                         if (ext2fs_file_acl_block(fs, &di->inode) == blk) {
 939                                 ext2fs_file_acl_block_set(fs, &di->inode,
 940                                         ext2fs_file_acl_block(fs, &dp->inode));
 941                                 e2fsck_write_inode(ctx, ino_el->inode,
 942                                            &di->inode, "clone file EA");
 943                                 decrement_badcount(ctx, blk, dc);
 944                         }
 945                 }
 946         }
 947         retval = 0;
 948 errout:
 949         ext2fs_free_mem(&cs.buf);
 950         return retval;
 951 }
 952
 953 /*
 954  * This routine returns 1 if a block overlaps with one of the superblocks,
 955  * group descriptors, inode bitmaps, or block bitmaps.
 956  */
 957 static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block)
 958 {
 959         ext2_filsys fs = ctx->fs;
 960         blk64_t first_block;
 961         dgrp_t  i;
 962
 963         first_block = fs->super->s_first_data_block;
 964         for (i = 0; i < fs->group_desc_count; i++) {
 965
 966                 /* Check superblocks/block group descriptors */
 967                 if (ext2fs_bg_has_super(fs, i)) {
 968                         if (test_block >= first_block &&
 969                             (test_block <= first_block + fs->desc_blocks))
 970                                 return 1;
 971                 }
 972
 973                 /* Check the inode table */
 974                 if ((ext2fs_inode_table_loc(fs, i)) &&
 975                     (test_block >= ext2fs_inode_table_loc(fs, i)) &&
 976                     (test_block < (ext2fs_inode_table_loc(fs, i) +
 977                                    fs->inode_blocks_per_group)))
 978                         return 1;
 979
 980                 /* Check the bitmap blocks */
 981                 if ((test_block == ext2fs_block_bitmap_loc(fs, i)) ||
 982                     (test_block == ext2fs_inode_bitmap_loc(fs, i)))
 983                         return 1;
 984
 985                 first_block += fs->super->s_blocks_per_group;
 986         }
 987         return 0;
 988 }
 989
 990 /*
 991  * This routine returns 1 if a cluster overlaps with one of the superblocks,
 992  * group descriptors, inode bitmaps, or block bitmaps.
 993  */
 994 static int check_if_fs_cluster(e2fsck_t ctx, blk64_t cluster)
 995 {
 996         ext2_filsys fs = ctx->fs;
 997         blk64_t first_block;
 998         dgrp_t  i;
 999
1000         first_block = fs->super->s_first_data_block;
1001         for (i = 0; i < fs->group_desc_count; i++) {
1002
1003                 /* Check superblocks/block group descriptors */
1004                 if (ext2fs_bg_has_super(fs, i)) {
1005                         if (cluster >= EXT2FS_B2C(fs, first_block) &&
1006                             (cluster <= EXT2FS_B2C(fs, first_block +
1007                                                    fs->desc_blocks)))
1008                                 return 1;
1009                 }
1010
1011                 /* Check the inode table */
1012                 if ((ext2fs_inode_table_loc(fs, i)) &&
1013                     (cluster >= EXT2FS_B2C(fs,
1014                                            ext2fs_inode_table_loc(fs, i))) &&
1015                     (cluster <= EXT2FS_B2C(fs,
1016                                            ext2fs_inode_table_loc(fs, i) +
1017                                            fs->inode_blocks_per_group - 1)))
1018                         return 1;
1019
1020                 /* Check the bitmap blocks */
1021                 if ((cluster == EXT2FS_B2C(fs,
1022                                            ext2fs_block_bitmap_loc(fs, i))) ||
1023                     (cluster == EXT2FS_B2C(fs,
1024                                            ext2fs_inode_bitmap_loc(fs, i))))
1025                         return 1;
1026
1027                 first_block += fs->super->s_blocks_per_group;
1028         }
1029         return 0;
1030 }