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 "support/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_large 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_large *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_large *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_large 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 = EXT2_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_full(scan, &ino,
 301                                 EXT2_INODE(&inode), sizeof(inode));
 302                 if (pctx.errcode == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
 303                         continue;
 304                 if (pctx.errcode) {
 305                         pctx.ino = ino;
 306                         fix_problem(ctx, PR_1B_ISCAN_ERROR, &pctx);
 307                         ctx->flags |= E2F_FLAG_ABORT;
 308                         return;
 309                 }
 310                 if (!ino)
 311                         break;
 312                 pctx.ino = ctx->stashed_ino = ino;
 313                 if ((ino != EXT2_BAD_INO) &&
 314                     !ext2fs_test_inode_bitmap2(ctx->inode_used_map, ino))
 315                         continue;
 316
 317                 pb.ino = ino;
 318                 pb.dup_blocks = 0;
 319                 pb.inode = &inode;
 320                 pb.cur_cluster = ~0;
 321                 pb.phys_cluster = ~0;
 322                 pb.last_blk = 0;
 323                 pb.pctx->blk = pb.pctx->blk2 = 0;
 324
 325                 if (ext2fs_inode_has_valid_blocks2(fs, EXT2_INODE(&inode)) ||
 326                     (ino == EXT2_BAD_INO))
 327                         pctx.errcode = ext2fs_block_iterate3(fs, ino,
 328                                              BLOCK_FLAG_READ_ONLY, block_buf,
 329                                              process_pass1b_block, &pb);
 330                 /* If the feature is not set, attrs will be cleared later anyway */
 331                 if (ext2fs_has_feature_xattr(fs->super) &&
 332                     ext2fs_file_acl_block(fs, EXT2_INODE(&inode))) {
 333                         blk64_t blk = ext2fs_file_acl_block(fs, EXT2_INODE(&inode));
 334                         process_pass1b_block(fs, &blk,
 335                                              BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 336                         ext2fs_file_acl_block_set(fs, EXT2_INODE(&inode), blk);
 337                 }
 338                 if (pb.dup_blocks) {
 339                         if (ino != EXT2_BAD_INO) {
 340                                 op = pctx.blk == pctx.blk2 ?
 341                                         PR_1B_DUP_BLOCK : PR_1B_DUP_RANGE;
 342                                 fix_problem(ctx, op, pb.pctx);
 343                         }
 344                         end_problem_latch(ctx, PR_LATCH_DBLOCK);
 345                         if (ino >= EXT2_FIRST_INODE(fs->super) ||
 346                             ino == EXT2_ROOT_INO)
 347                                 dup_inode_count++;
 348                 }
 349                 if (pctx.errcode)
 350                         fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 351         }
 352         ext2fs_close_inode_scan(scan);
 353         e2fsck_use_inode_shortcuts(ctx, 0);
 354 }
 355
 356 static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
 357                                 blk64_t *block_nr,
 358                                 e2_blkcnt_t blockcnt,
 359                                 blk64_t ref_blk EXT2FS_ATTR((unused)),
 360                                 int ref_offset EXT2FS_ATTR((unused)),
 361                                 void *priv_data)
 362 {
 363         struct process_block_struct *p;
 364         e2fsck_t ctx;
 365         blk64_t lc, pc;
 366         problem_t op;
 367
 368         if (*block_nr == 0)
 369                 return 0;
 370         p = (struct process_block_struct *) priv_data;
 371         ctx = p->ctx;
 372         lc = EXT2FS_B2C(fs, blockcnt);
 373         pc = EXT2FS_B2C(fs, *block_nr);
 374
 375         if (!ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr))
 376                 goto finish;
 377
 378         /* OK, this is a duplicate block */
 379         if (p->ino != EXT2_BAD_INO) {
 380                 if (p->last_blk + 1 != *block_nr) {
 381                         if (p->last_blk) {
 382                                 op = p->pctx->blk == p->pctx->blk2 ?
 383                                                 PR_1B_DUP_BLOCK :
 384                                                 PR_1B_DUP_RANGE;
 385                                 fix_problem(ctx, op, p->pctx);
 386                         }
 387                         p->pctx->blk = *block_nr;
 388                 }
 389                 p->pctx->blk2 = *block_nr;
 390                 p->last_blk = *block_nr;
 391         }
 392         p->dup_blocks++;
 393         ext2fs_mark_inode_bitmap2(inode_dup_map, p->ino);
 394
 395         /*
 396          * Qualifications for submitting a block for duplicate processing:
 397          * It's an extent/indirect block (and has a negative logical offset);
 398          * we've crossed a logical cluster boundary; or the physical cluster
 399          * suddenly changed, which indicates that blocks in a logical cluster
 400          * are mapped to multiple physical clusters.
 401          */
 402         if (blockcnt < 0 || lc != p->cur_cluster || pc != p->phys_cluster)
 403                 add_dupe(ctx, p->ino, EXT2FS_B2C(fs, *block_nr), p->inode);
 404
 405 finish:
 406         p->cur_cluster = lc;
 407         p->phys_cluster = pc;
 408         return 0;
 409 }
 410
 411 /*
 412  * Pass 1c: Scan directories for inodes with duplicate blocks.  This
 413  * is used so that we can print pathnames when prompting the user for
 414  * what to do.
 415  */
 416 struct search_dir_struct {
 417         int             count;
 418         ext2_ino_t      first_inode;
 419         ext2_ino_t      max_inode;
 420 };
 421
 422 static int search_dirent_proc(ext2_ino_t dir, int entry,
 423                               struct ext2_dir_entry *dirent,
 424                               int offset EXT2FS_ATTR((unused)),
 425                               int blocksize EXT2FS_ATTR((unused)),
 426                               char *buf EXT2FS_ATTR((unused)),
 427                               void *priv_data)
 428 {
 429         struct search_dir_struct *sd;
 430         struct dup_inode        *p;
 431         dnode_t                 *n;
 432
 433         sd = (struct search_dir_struct *) priv_data;
 434
 435         if (dirent->inode > sd->max_inode)
 436                 /* Should abort this inode, but not everything */
 437                 return 0;
 438
 439         if ((dirent->inode < sd->first_inode) || (entry < DIRENT_OTHER_FILE) ||
 440             !ext2fs_test_inode_bitmap2(inode_dup_map, dirent->inode))
 441                 return 0;
 442
 443         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(dirent->inode));
 444         if (!n)
 445                 return 0;
 446         p = (struct dup_inode *) dnode_get(n);
 447         if (!p->dir) {
 448                 p->dir = dir;
 449                 sd->count--;
 450         }
 451
 452         return(sd->count ? 0 : DIRENT_ABORT);
 453 }
 454
 455
 456 static void pass1c(e2fsck_t ctx, char *block_buf)
 457 {
 458         ext2_filsys fs = ctx->fs;
 459         struct search_dir_struct sd;
 460         struct problem_context pctx;
 461
 462         clear_problem_context(&pctx);
 463
 464         if (!(ctx->options & E2F_OPT_PREEN))
 465                 fix_problem(ctx, PR_1C_PASS_HEADER, &pctx);
 466
 467         /*
 468          * Search through all directories to translate inodes to names
 469          * (by searching for the containing directory for that inode.)
 470          */
 471         sd.count = dup_inode_count - dup_inode_founddir;
 472         sd.first_inode = EXT2_FIRST_INODE(fs->super);
 473         sd.max_inode = fs->super->s_inodes_count;
 474         ext2fs_dblist_dir_iterate(fs->dblist, 0, block_buf,
 475                                   search_dirent_proc, &sd);
 476 }
 477
 478 static void pass1d(e2fsck_t ctx, char *block_buf)
 479 {
 480         ext2_filsys fs = ctx->fs;
 481         struct dup_inode        *p, *t;
 482         struct dup_cluster      *q;
 483         ext2_ino_t              *shared, ino;
 484         int     shared_len;
 485         int     i;
 486         int     file_ok;
 487         int     meta_data = 0;
 488         struct problem_context pctx;
 489         dnode_t *n, *m;
 490         struct cluster_el       *s;
 491         struct inode_el *r;
 492
 493         clear_problem_context(&pctx);
 494
 495         if (!(ctx->options & E2F_OPT_PREEN))
 496                 fix_problem(ctx, PR_1D_PASS_HEADER, &pctx);
 497         e2fsck_read_bitmaps(ctx);
 498
 499         pctx.num = dup_inode_count; /* dict_count(&ino_dict); */
 500         fix_problem(ctx, PR_1D_NUM_DUP_INODES, &pctx);
 501         shared = (ext2_ino_t *) e2fsck_allocate_memory(ctx,
 502                                 sizeof(ext2_ino_t) * dict_count(&ino_dict),
 503                                 "Shared inode list");
 504         for (n = dict_first(&ino_dict); n; n = dict_next(&ino_dict, n)) {
 505                 p = (struct dup_inode *) dnode_get(n);
 506                 shared_len = 0;
 507                 file_ok = 1;
 508                 ino = (ext2_ino_t)VOIDPTR_TO_INT(dnode_getkey(n));
 509                 if (ino == EXT2_BAD_INO || ino == EXT2_RESIZE_INO)
 510                         continue;
 511
 512                 /*
 513                  * Find all of the inodes which share blocks with this
 514                  * one.  First we find all of the duplicate blocks
 515                  * belonging to this inode, and then search each block
 516                  * get the list of inodes, and merge them together.
 517                  */
 518                 for (s = p->cluster_list; s; s = s->next) {
 519                         m = dict_lookup(&clstr_dict,
 520                                         INT_TO_VOIDPTR(s->cluster));
 521                         if (!m)
 522                                 continue; /* Should never happen... */
 523                         q = (struct dup_cluster *) dnode_get(m);
 524                         if (q->num_bad > 1)
 525                                 file_ok = 0;
 526                         if (check_if_fs_cluster(ctx, s->cluster)) {
 527                                 file_ok = 0;
 528                                 meta_data = 1;
 529                         }
 530
 531                         /*
 532                          * Add all inodes used by this block to the
 533                          * shared[] --- which is a unique list, so
 534                          * if an inode is already in shared[], don't
 535                          * add it again.
 536                          */
 537                         for (r = q->inode_list; r; r = r->next) {
 538                                 if (r->inode == ino)
 539                                         continue;
 540                                 for (i = 0; i < shared_len; i++)
 541                                         if (shared[i] == r->inode)
 542                                                 break;
 543                                 if (i == shared_len) {
 544                                         shared[shared_len++] = r->inode;
 545                                 }
 546                         }
 547                 }
 548
 549                 /*
 550                  * Report the inode that we are working on
 551                  */
 552                 pctx.inode = EXT2_INODE(&p->inode);
 553                 pctx.ino = ino;
 554                 pctx.dir = p->dir;
 555                 pctx.blkcount = p->num_dupblocks;
 556                 pctx.num = meta_data ? shared_len+1 : shared_len;
 557                 fix_problem(ctx, PR_1D_DUP_FILE, &pctx);
 558                 pctx.blkcount = 0;
 559                 pctx.num = 0;
 560
 561                 if (meta_data)
 562                         fix_problem(ctx, PR_1D_SHARE_METADATA, &pctx);
 563
 564                 for (i = 0; i < shared_len; i++) {
 565                         m = dict_lookup(&ino_dict, INT_TO_VOIDPTR(shared[i]));
 566                         if (!m)
 567                                 continue; /* should never happen */
 568                         t = (struct dup_inode *) dnode_get(m);
 569                         /*
 570                          * Report the inode that we are sharing with
 571                          */
 572                         pctx.inode = EXT2_INODE(&t->inode);
 573                         pctx.ino = shared[i];
 574                         pctx.dir = t->dir;
 575                         fix_problem(ctx, PR_1D_DUP_FILE_LIST, &pctx);
 576                 }
 577                 /*
 578                  * Even if the file shares blocks with itself, we still need to
 579                  * clone the blocks.
 580                  */
 581                 if (file_ok && (meta_data ? shared_len+1 : shared_len) != 0) {
 582                         fix_problem(ctx, PR_1D_DUP_BLOCKS_DEALT, &pctx);
 583                         continue;
 584                 }
 585                 if (fix_problem(ctx, PR_1D_CLONE_QUESTION, &pctx)) {
 586                         pctx.errcode = clone_file(ctx, ino, p, block_buf);
 587                         if (pctx.errcode)
 588                                 fix_problem(ctx, PR_1D_CLONE_ERROR, &pctx);
 589                         else
 590                                 continue;
 591                 }
 592                 if (fix_problem(ctx, PR_1D_DELETE_QUESTION, &pctx))
 593                         delete_file(ctx, ino, p, block_buf);
 594                 else
 595                         ext2fs_unmark_valid(fs);
 596         }
 597         ext2fs_free_mem(&shared);
 598 }
 599
 600 /*
 601  * Drop the refcount on the dup_block structure, and clear the entry
 602  * in the block_dup_map if appropriate.
 603  */
 604 static void decrement_badcount(e2fsck_t ctx, blk64_t block,
 605                                struct dup_cluster *p)
 606 {
 607         p->num_bad--;
 608         if (p->num_bad <= 0 ||
 609             (p->num_bad == 1 && !check_if_fs_block(ctx, block))) {
 610                 if (check_if_fs_cluster(ctx, EXT2FS_B2C(ctx->fs, block)))
 611                         return;
 612                 ext2fs_unmark_block_bitmap2(ctx->block_dup_map, block);
 613         }
 614 }
 615
 616 static int delete_file_block(ext2_filsys fs,
 617                              blk64_t    *block_nr,
 618                              e2_blkcnt_t blockcnt,
 619                              blk64_t ref_block EXT2FS_ATTR((unused)),
 620                              int ref_offset EXT2FS_ATTR((unused)),
 621                              void *priv_data)
 622 {
 623         struct process_block_struct *pb;
 624         struct dup_cluster *p;
 625         dnode_t *n;
 626         e2fsck_t ctx;
 627         blk64_t c, lc;
 628
 629         pb = (struct process_block_struct *) priv_data;
 630         ctx = pb->ctx;
 631
 632         if (*block_nr == 0)
 633                 return 0;
 634
 635         c = EXT2FS_B2C(fs, *block_nr);
 636         lc = EXT2FS_B2C(fs, blockcnt);
 637         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 638                 n = dict_lookup(&clstr_dict, INT_TO_VOIDPTR(c));
 639                 if (n) {
 640                         if (lc != pb->cur_cluster) {
 641                                 p = (struct dup_cluster *) dnode_get(n);
 642                                 decrement_badcount(ctx, *block_nr, p);
 643                                 pb->dup_blocks++;
 644                         }
 645                 } else
 646                         com_err("delete_file_block", 0,
 647                             _("internal error: can't find dup_blk for %llu\n"),
 648                                 *block_nr);
 649         } else {
 650                 if ((*block_nr % EXT2FS_CLUSTER_RATIO(ctx->fs)) == 0)
 651                         ext2fs_block_alloc_stats2(fs, *block_nr, -1);
 652                 pb->dup_blocks++;
 653         }
 654         pb->cur_cluster = lc;
 655
 656         return 0;
 657 }
 658
 659 static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
 660                         struct dup_inode *dp, char* block_buf)
 661 {
 662         ext2_filsys fs = ctx->fs;
 663         struct process_block_struct pb;
 664         struct problem_context  pctx;
 665         unsigned int            count;
 666
 667         clear_problem_context(&pctx);
 668         pctx.ino = pb.ino = ino;
 669         pb.dup_blocks = 0;
 670         pb.ctx = ctx;
 671         pctx.str = "delete_file";
 672         pb.cur_cluster = ~0;
 673
 674         if (ext2fs_inode_has_valid_blocks2(fs, EXT2_INODE(&dp->inode)))
 675                 pctx.errcode = ext2fs_block_iterate3(fs, ino,
 676                                                      BLOCK_FLAG_READ_ONLY,
 677                                                      block_buf,
 678                                                      delete_file_block, &pb);
 679         if (pctx.errcode)
 680                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 681         if (ctx->inode_bad_map)
 682                 ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
 683         ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(dp->inode.i_mode));
 684         quota_data_sub(ctx->qctx, &dp->inode, ino,
 685                        pb.dup_blocks * fs->blocksize);
 686         quota_data_inodes(ctx->qctx, &dp->inode, ino, -1);
 687
 688         /* Inode may have changed by block_iterate, so reread it */
 689         e2fsck_read_inode_full(ctx, ino, EXT2_INODE(&dp->inode),
 690                                sizeof(dp->inode), "delete_file");
 691         e2fsck_clear_inode(ctx, ino, EXT2_INODE(&dp->inode), 0, "delete_file");
 692         if (ext2fs_file_acl_block(fs, EXT2_INODE(&dp->inode)) &&
 693             ext2fs_has_feature_xattr(fs->super)) {
 694                 blk64_t file_acl_block = ext2fs_file_acl_block(fs,
 695                                                 EXT2_INODE(&dp->inode));
 696
 697                 count = 1;
 698                 pctx.errcode = ext2fs_adjust_ea_refcount3(fs, file_acl_block,
 699                                         block_buf, -1, &count, ino);
 700                 if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
 701                         pctx.errcode = 0;
 702                         count = 1;
 703                 }
 704                 if (pctx.errcode) {
 705                         pctx.blk = file_acl_block;
 706                         fix_problem(ctx, PR_1B_ADJ_EA_REFCOUNT, &pctx);
 707                 }
 708                 /*
 709                  * If the count is zero, then arrange to have the
 710                  * block deleted.  If the block is in the block_dup_map,
 711                  * also call delete_file_block since it will take care
 712                  * of keeping the accounting straight.
 713                  */
 714                 if ((count == 0) ||
 715                     ext2fs_test_block_bitmap2(ctx->block_dup_map,
 716                                               file_acl_block)) {
 717                         delete_file_block(fs, &file_acl_block,
 718                                           BLOCK_COUNT_EXTATTR, 0, 0, &pb);
 719                         ext2fs_file_acl_block_set(fs, EXT2_INODE(&dp->inode),
 720                                                   file_acl_block);
 721                         quota_data_sub(ctx->qctx, &dp->inode, ino,
 722                                        fs->blocksize);
 723                 }
 724         }
 725 }
 726
 727 struct clone_struct {
 728         errcode_t       errcode;
 729         blk64_t         dup_cluster;
 730         blk64_t         alloc_block;
 731         ext2_ino_t      dir, ino;
 732         char    *buf;
 733         e2fsck_t ctx;
 734         struct ext2_inode_large *inode;
 735
 736         struct dup_cluster *save_dup_cluster;
 737         blk64_t save_blocknr;
 738 };
 739
 740 /*
 741  * Decrement the bad count *after* we've shown that (a) we can allocate a
 742  * replacement block and (b) remap the file blocks.  Unfortunately, there's no
 743  * way to find out if the remap succeeded until either the next
 744  * clone_file_block() call (an error when remapping the block after returning
 745  * BLOCK_CHANGED will halt the iteration) or after block_iterate() returns.
 746  * Otherwise, it's possible that we decrease the badcount once in preparation
 747  * to remap, then the remap fails (either we can't find a replacement block or
 748  * we have to split the extent tree and can't find a new extent block), so we
 749  * delete the file, which decreases the badcount again.
 750  */
 751 static void deferred_dec_badcount(struct clone_struct *cs)
 752 {
 753         if (!cs->save_dup_cluster)
 754                 return;
 755         decrement_badcount(cs->ctx, cs->save_blocknr, cs->save_dup_cluster);
 756         cs->save_dup_cluster = NULL;
 757 }
 758
 759 static int clone_file_block(ext2_filsys fs,
 760                             blk64_t     *block_nr,
 761                             e2_blkcnt_t blockcnt,
 762                             blk64_t ref_block EXT2FS_ATTR((unused)),
 763                             int ref_offset EXT2FS_ATTR((unused)),
 764                             void *priv_data)
 765 {
 766         struct dup_cluster *p = NULL;
 767         blk64_t new_block;
 768         errcode_t       retval;
 769         struct clone_struct *cs = (struct clone_struct *) priv_data;
 770         dnode_t *n;
 771         e2fsck_t ctx;
 772         blk64_t c;
 773         int is_meta = 0;
 774
 775         ctx = cs->ctx;
 776         deferred_dec_badcount(cs);
 777
 778         if (*block_nr == 0)
 779                 return 0;
 780
 781         c = EXT2FS_B2C(fs, blockcnt);
 782         if (check_if_fs_cluster(ctx, EXT2FS_B2C(fs, *block_nr)))
 783                 is_meta = 1;
 784
 785         if (c == cs->dup_cluster && cs->alloc_block) {
 786                 new_block = cs->alloc_block;
 787                 goto got_block;
 788         }
 789
 790         if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
 791                 n = dict_lookup(&clstr_dict,
 792                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, *block_nr)));
 793                 if (!n) {
 794                         com_err("clone_file_block", 0,
 795                             _("internal error: can't find dup_blk for %llu\n"),
 796                                 *block_nr);
 797                         return 0;
 798                 }
 799
 800                 p = (struct dup_cluster *) dnode_get(n);
 801
 802                 cs->dup_cluster = c;
 803                 /*
 804                  * Let's try an implied cluster allocation.  If we get the same
 805                  * cluster back, then we need to find a new block; otherwise,
 806                  * we're merely fixing the problem of one logical cluster being
 807                  * mapped to multiple physical clusters.
 808                  */
 809                 new_block = 0;
 810                 retval = ext2fs_map_cluster_block(fs, cs->ino,
 811                                                   EXT2_INODE(cs->inode),
 812                                                   blockcnt, &new_block);
 813                 if (retval == 0 && new_block != 0 &&
 814                     EXT2FS_B2C(ctx->fs, new_block) !=
 815                     EXT2FS_B2C(ctx->fs, *block_nr))
 816                         goto cluster_alloc_ok;
 817                 retval = ext2fs_new_block2(fs, 0, ctx->block_found_map,
 818                                            &new_block);
 819                 if (retval) {
 820                         cs->errcode = retval;
 821                         return BLOCK_ABORT;
 822                 }
 823 cluster_alloc_ok:
 824                 cs->alloc_block = new_block;
 825
 826         got_block:
 827                 new_block &= ~EXT2FS_CLUSTER_MASK(fs);
 828                 new_block += EXT2FS_CLUSTER_MASK(fs) & blockcnt;
 829                 if (cs->dir && (blockcnt >= 0)) {
 830                         retval = ext2fs_set_dir_block2(fs->dblist,
 831                                         cs->dir, new_block, blockcnt);
 832                         if (retval) {
 833                                 cs->errcode = retval;
 834                                 return BLOCK_ABORT;
 835                         }
 836                 }
 837 #if 0
 838                 printf("Cloning block #%lld from %llu to %llu\n",
 839                        blockcnt, *block_nr, new_block);
 840 #endif
 841                 retval = io_channel_read_blk64(fs->io, *block_nr, 1, cs->buf);
 842                 if (retval) {
 843                         cs->errcode = retval;
 844                         return BLOCK_ABORT;
 845                 }
 846                 retval = io_channel_write_blk64(fs->io, new_block, 1, cs->buf);
 847                 if (retval) {
 848                         cs->errcode = retval;
 849                         return BLOCK_ABORT;
 850                 }
 851                 cs->save_dup_cluster = (is_meta ? NULL : p);
 852                 cs->save_blocknr = *block_nr;
 853                 *block_nr = new_block;
 854                 ext2fs_mark_block_bitmap2(ctx->block_found_map, new_block);
 855                 ext2fs_mark_block_bitmap2(fs->block_map, new_block);
 856                 return BLOCK_CHANGED;
 857         }
 858         return 0;
 859 }
 860
 861 static errcode_t clone_file(e2fsck_t ctx, ext2_ino_t ino,
 862                             struct dup_inode *dp, char* block_buf)
 863 {
 864         ext2_filsys fs = ctx->fs;
 865         errcode_t       retval;
 866         struct clone_struct cs;
 867         struct problem_context  pctx;
 868         blk64_t         blk, new_blk;
 869         dnode_t         *n;
 870         struct inode_el *ino_el;
 871         struct dup_cluster      *dc;
 872         struct dup_inode        *di;
 873
 874         clear_problem_context(&pctx);
 875         cs.errcode = 0;
 876         cs.dir = 0;
 877         cs.dup_cluster = ~0;
 878         cs.alloc_block = 0;
 879         cs.ctx = ctx;
 880         cs.ino = ino;
 881         cs.inode = &dp->inode;
 882         cs.save_dup_cluster = NULL;
 883         cs.save_blocknr = 0;
 884         retval = ext2fs_get_mem(fs->blocksize, &cs.buf);
 885         if (retval)
 886                 return retval;
 887
 888         if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, ino))
 889                 cs.dir = ino;
 890
 891         pctx.ino = ino;
 892         pctx.str = "clone_file";
 893         if (ext2fs_inode_has_valid_blocks2(fs, EXT2_INODE(&dp->inode)))
 894                 pctx.errcode = ext2fs_block_iterate3(fs, ino, 0, block_buf,
 895                                                      clone_file_block, &cs);
 896         deferred_dec_badcount(&cs);
 897         ext2fs_mark_bb_dirty(fs);
 898         if (pctx.errcode) {
 899                 fix_problem(ctx, PR_1B_BLOCK_ITERATE, &pctx);
 900                 retval = pctx.errcode;
 901                 goto errout;
 902         }
 903         if (cs.errcode) {
 904                 com_err("clone_file", cs.errcode, "%s",
 905                         _("returned from clone_file_block"));
 906                 retval = cs.errcode;
 907                 goto errout;
 908         }
 909         /* The inode may have changed on disk, so we have to re-read it */
 910         e2fsck_read_inode_full(ctx, ino, EXT2_INODE(&dp->inode),
 911                                sizeof(dp->inode), "clone file EA");
 912         blk = ext2fs_file_acl_block(fs, EXT2_INODE(&dp->inode));
 913         new_blk = blk;
 914         if (blk && (clone_file_block(fs, &new_blk,
 915                                      BLOCK_COUNT_EXTATTR, 0, 0, &cs) ==
 916                     BLOCK_CHANGED)) {
 917                 ext2fs_file_acl_block_set(fs, EXT2_INODE(&dp->inode), new_blk);
 918                 e2fsck_write_inode_full(ctx, ino, EXT2_INODE(&dp->inode),
 919                                         sizeof(dp->inode), "clone file EA");
 920                 /*
 921                  * If we cloned the EA block, find all other inodes
 922                  * which referred to that EA block, and modify
 923                  * them to point to the new EA block.
 924                  */
 925                 n = dict_lookup(&clstr_dict,
 926                                 INT_TO_VOIDPTR(EXT2FS_B2C(fs, blk)));
 927                 if (!n) {
 928                         com_err("clone_file", 0,
 929                                 _("internal error: couldn't lookup EA "
 930                                   "block record for %llu"), blk);
 931                         retval = 0; /* OK to stumble on... */
 932                         goto errout;
 933                 }
 934                 dc = (struct dup_cluster *) dnode_get(n);
 935                 for (ino_el = dc->inode_list; ino_el; ino_el = ino_el->next) {
 936                         if (ino_el->inode == ino)
 937                                 continue;
 938                         n = dict_lookup(&ino_dict, INT_TO_VOIDPTR(ino_el->inode));
 939                         if (!n) {
 940                                 com_err("clone_file", 0,
 941                                         _("internal error: couldn't lookup EA "
 942                                           "inode record for %u"),
 943                                         ino_el->inode);
 944                                 retval = 0; /* OK to stumble on... */
 945                                 goto errout;
 946                         }
 947                         di = (struct dup_inode *) dnode_get(n);
 948                         if (ext2fs_file_acl_block(fs,
 949                                         EXT2_INODE(&di->inode)) == blk) {
 950                                 ext2fs_file_acl_block_set(fs,
 951                                         EXT2_INODE(&di->inode),
 952                                         ext2fs_file_acl_block(fs, EXT2_INODE(&dp->inode)));
 953                                 e2fsck_write_inode_full(ctx, ino_el->inode,
 954                                         EXT2_INODE(&di->inode),
 955                                         sizeof(di->inode), "clone file EA");
 956                                 decrement_badcount(ctx, blk, dc);
 957                         }
 958                 }
 959         }
 960         retval = 0;
 961 errout:
 962         ext2fs_free_mem(&cs.buf);
 963         return retval;
 964 }
 965
 966 /*
 967  * This routine returns 1 if a block overlaps with one of the superblocks,
 968  * group descriptors, inode bitmaps, or block bitmaps.
 969  */
 970 static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block)
 971 {
 972         ext2_filsys fs = ctx->fs;
 973         blk64_t first_block;
 974         dgrp_t  i;
 975
 976         first_block = fs->super->s_first_data_block;
 977         for (i = 0; i < fs->group_desc_count; i++) {
 978
 979                 /* Check superblocks/block group descriptors */
 980                 if (ext2fs_bg_has_super(fs, i)) {
 981                         if (test_block >= first_block &&
 982                             (test_block <= first_block + fs->desc_blocks))
 983                                 return 1;
 984                 }
 985
 986                 /* Check the inode table */
 987                 if ((ext2fs_inode_table_loc(fs, i)) &&
 988                     (test_block >= ext2fs_inode_table_loc(fs, i)) &&
 989                     (test_block < (ext2fs_inode_table_loc(fs, i) +
 990                                    fs->inode_blocks_per_group)))
 991                         return 1;
 992
 993                 /* Check the bitmap blocks */
 994                 if ((test_block == ext2fs_block_bitmap_loc(fs, i)) ||
 995                     (test_block == ext2fs_inode_bitmap_loc(fs, i)))
 996                         return 1;
 997
 998                 first_block += fs->super->s_blocks_per_group;
 999         }
1000         return 0;
1001 }
1002
1003 /*
1004  * This routine returns 1 if a cluster overlaps with one of the superblocks,
1005  * group descriptors, inode bitmaps, or block bitmaps.
1006  */
1007 static int check_if_fs_cluster(e2fsck_t ctx, blk64_t cluster)
1008 {
1009         ext2_filsys fs = ctx->fs;
1010         blk64_t first_block;
1011         dgrp_t  i;
1012
1013         first_block = fs->super->s_first_data_block;
1014         for (i = 0; i < fs->group_desc_count; i++) {
1015
1016                 /* Check superblocks/block group descriptors */
1017                 if (ext2fs_bg_has_super(fs, i)) {
1018                         if (cluster >= EXT2FS_B2C(fs, first_block) &&
1019                             (cluster <= EXT2FS_B2C(fs, first_block +
1020                                                    fs->desc_blocks)))
1021                                 return 1;
1022                 }
1023
1024                 /* Check the inode table */
1025                 if ((ext2fs_inode_table_loc(fs, i)) &&
1026                     (cluster >= EXT2FS_B2C(fs,
1027                                            ext2fs_inode_table_loc(fs, i))) &&
1028                     (cluster <= EXT2FS_B2C(fs,
1029                                            ext2fs_inode_table_loc(fs, i) +
1030                                            fs->inode_blocks_per_group - 1)))
1031                         return 1;
1032
1033                 /* Check the bitmap blocks */
1034                 if ((cluster == EXT2FS_B2C(fs,
1035                                            ext2fs_block_bitmap_loc(fs, i))) ||
1036                     (cluster == EXT2FS_B2C(fs,
1037                                            ext2fs_inode_bitmap_loc(fs, i))))
1038                         return 1;
1039
1040                 first_block += fs->super->s_blocks_per_group;
1041         }
1042         return 0;
1043 }