lib/ext2fs/icount.c

   1 /*
   2  * icount.c --- an efficient inode count abstraction
   3  *
   4  * Copyright (C) 1997 Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Library
   8  * General Public License, version 2.
   9  * %End-Header%
  10  */
  11
  12 #include "config.h"
  13 #if HAVE_UNISTD_H
  14 #include <unistd.h>
  15 #endif
  16 #include <assert.h>
  17 #include <string.h>
  18 #include <stdio.h>
  19 #include <sys/stat.h>
  20 #include <fcntl.h>
  21 #include <errno.h>
  22
  23 #include "ext2_fs.h"
  24 #include "ext2fs.h"
  25 #include "tdb.h"
  26
  27 /*
  28  * The data storage strategy used by icount relies on the observation
  29  * that most inode counts are either zero (for non-allocated inodes),
  30  * one (for most files), and only a few that are two or more
  31  * (directories and files that are linked to more than one directory).
  32  *
  33  * Also, e2fsck tends to load the icount data sequentially.
  34  *
  35  * So, we use an inode bitmap to indicate which inodes have a count of
  36  * one, and then use a sorted list to store the counts for inodes
  37  * which are greater than one.
  38  *
  39  * We also use an optional bitmap to indicate which inodes are already
  40  * in the sorted list, to speed up the use of this abstraction by
  41  * e2fsck's pass 2.  Pass 2 increments inode counts as it finds them,
  42  * so this extra bitmap avoids searching the sorted list to see if a
  43  * particular inode is on the sorted list already.
  44  */
  45
  46 struct ext2_icount_el {
  47         ext2_ino_t      ino;
  48         __u32           count;
  49 };
  50
  51 struct ext2_icount {
  52         errcode_t               magic;
  53         ext2fs_inode_bitmap     single;
  54         ext2fs_inode_bitmap     multiple;
  55         ext2_ino_t              count;
  56         ext2_ino_t              size;
  57         ext2_ino_t              num_inodes;
  58         ext2_ino_t              cursor;
  59         struct ext2_icount_el   *list;
  60         struct ext2_icount_el   *last_lookup;
  61 #ifdef CONFIG_TDB
  62         char                    *tdb_fn;
  63         TDB_CONTEXT             *tdb;
  64 #endif
  65         __u16                   *fullmap;
  66 };
  67
  68 /*
  69  * We now use a 32-bit counter field because it doesn't cost us
  70  * anything extra for the in-memory data structure, due to alignment
  71  * padding.  But there's no point changing the interface if most of
  72  * the time we only care if the number is bigger than 65,000 or not.
  73  * So use the following translation function to return a 16-bit count.
  74  */
  75 #define icount_16_xlate(x) (((x) > 65500) ? 65500 : (x))
  76
  77 void ext2fs_free_icount(ext2_icount_t icount)
  78 {
  79         if (!icount)
  80                 return;
  81
  82         icount->magic = 0;
  83         if (icount->list)
  84                 ext2fs_free_mem(&icount->list);
  85         if (icount->single)
  86                 ext2fs_free_inode_bitmap(icount->single);
  87         if (icount->multiple)
  88                 ext2fs_free_inode_bitmap(icount->multiple);
  89 #ifdef CONFIG_TDB
  90         if (icount->tdb)
  91                 tdb_close(icount->tdb);
  92         if (icount->tdb_fn) {
  93                 (void) unlink(icount->tdb_fn);
  94                 free(icount->tdb_fn);
  95         }
  96 #endif
  97
  98         if (icount->fullmap)
  99                 ext2fs_free_mem(&icount->fullmap);
 100
 101         ext2fs_free_mem(&icount);
 102 }
 103
 104 static errcode_t alloc_icount(ext2_filsys fs, int flags, ext2_icount_t *ret)
 105 {
 106         ext2_icount_t   icount;
 107         errcode_t       retval;
 108
 109         *ret = 0;
 110
 111         retval = ext2fs_get_mem(sizeof(struct ext2_icount), &icount);
 112         if (retval)
 113                 return retval;
 114         memset(icount, 0, sizeof(struct ext2_icount));
 115         icount->magic = EXT2_ET_MAGIC_ICOUNT;
 116         icount->num_inodes = fs->super->s_inodes_count;
 117
 118         if ((flags & EXT2_ICOUNT_OPT_FULLMAP) &&
 119             (flags & EXT2_ICOUNT_OPT_INCREMENT)) {
 120                 unsigned sz = sizeof(*icount->fullmap) * icount->num_inodes;
 121
 122                 retval = ext2fs_get_mem(sz, &icount->fullmap);
 123                 /* If we can't allocate, fall back */
 124                 if (!retval) {
 125                         memset(icount->fullmap, 0, sz);
 126                         *ret = icount;
 127                         return 0;
 128                 }
 129         }
 130
 131         retval = ext2fs_allocate_inode_bitmap(fs, "icount", &icount->single);
 132         if (retval)
 133                 goto errout;
 134
 135         if (flags & EXT2_ICOUNT_OPT_INCREMENT) {
 136                 retval = ext2fs_allocate_inode_bitmap(fs, "icount_inc",
 137                                                       &icount->multiple);
 138                 if (retval)
 139                         goto errout;
 140         } else
 141                 icount->multiple = 0;
 142
 143         *ret = icount;
 144         return 0;
 145
 146 errout:
 147         ext2fs_free_icount(icount);
 148         return(retval);
 149 }
 150
 151 #ifdef CONFIG_TDB
 152 struct uuid {
 153         __u32   time_low;
 154         __u16   time_mid;
 155         __u16   time_hi_and_version;
 156         __u16   clock_seq;
 157         __u8    node[6];
 158 };
 159
 160 static void unpack_uuid(void *in, struct uuid *uu)
 161 {
 162         __u8    *ptr = in;
 163         __u32   tmp;
 164
 165         tmp = *ptr++;
 166         tmp = (tmp << 8) | *ptr++;
 167         tmp = (tmp << 8) | *ptr++;
 168         tmp = (tmp << 8) | *ptr++;
 169         uu->time_low = tmp;
 170
 171         tmp = *ptr++;
 172         tmp = (tmp << 8) | *ptr++;
 173         uu->time_mid = tmp;
 174
 175         tmp = *ptr++;
 176         tmp = (tmp << 8) | *ptr++;
 177         uu->time_hi_and_version = tmp;
 178
 179         tmp = *ptr++;
 180         tmp = (tmp << 8) | *ptr++;
 181         uu->clock_seq = tmp;
 182
 183         memcpy(uu->node, ptr, 6);
 184 }
 185
 186 static void uuid_unparse(void *uu, char *out)
 187 {
 188         struct uuid uuid;
 189
 190         unpack_uuid(uu, &uuid);
 191         sprintf(out,
 192                 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
 193                 uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
 194                 uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
 195                 uuid.node[0], uuid.node[1], uuid.node[2],
 196                 uuid.node[3], uuid.node[4], uuid.node[5]);
 197 }
 198 #endif
 199
 200 errcode_t ext2fs_create_icount_tdb(ext2_filsys fs EXT2FS_NO_TDB_UNUSED,
 201                                    char *tdb_dir EXT2FS_NO_TDB_UNUSED,
 202                                    int flags EXT2FS_NO_TDB_UNUSED,
 203                                    ext2_icount_t *ret EXT2FS_NO_TDB_UNUSED)
 204 {
 205 #ifdef CONFIG_TDB
 206         ext2_icount_t   icount;
 207         errcode_t       retval;
 208         char            *fn, uuid[40];
 209         ext2_ino_t      num_inodes;
 210         mode_t          save_umask;
 211         int             fd;
 212
 213         retval = alloc_icount(fs, flags,  &icount);
 214         if (retval)
 215                 return retval;
 216
 217         retval = ext2fs_get_mem(strlen(tdb_dir) + 64, &fn);
 218         if (retval)
 219                 goto errout;
 220         uuid_unparse(fs->super->s_uuid, uuid);
 221         sprintf(fn, "%s/%s-icount-XXXXXX", tdb_dir, uuid);
 222         save_umask = umask(077);
 223         fd = mkstemp(fn);
 224         if (fd < 0) {
 225                 retval = errno;
 226                 ext2fs_free_mem(&fn);
 227                 goto errout;
 228         }
 229         icount->tdb_fn = fn;
 230         umask(save_umask);
 231         /*
 232          * This is an overestimate of the size that we will need; the
 233          * ideal value is the number of used inodes with a count
 234          * greater than 1.  OTOH the times when we really need this is
 235          * with the backup programs that use lots of hard links, in
 236          * which case the number of inodes in use approaches the ideal
 237          * value.
 238          */
 239         num_inodes = fs->super->s_inodes_count - fs->super->s_free_inodes_count;
 240
 241         icount->tdb = tdb_open(fn, num_inodes, TDB_NOLOCK | TDB_NOSYNC,
 242                                O_RDWR | O_CREAT | O_TRUNC, 0600);
 243         close(fd);
 244         if (icount->tdb == NULL) {
 245                 retval = errno;
 246                 goto errout;
 247         }
 248         *ret = icount;
 249         return 0;
 250 errout:
 251         ext2fs_free_icount(icount);
 252         return(retval);
 253 #else
 254         return EXT2_ET_UNIMPLEMENTED;
 255 #endif
 256 }
 257
 258 errcode_t ext2fs_create_icount2(ext2_filsys fs, int flags, unsigned int size,
 259                                 ext2_icount_t hint, ext2_icount_t *ret)
 260 {
 261         ext2_icount_t   icount;
 262         errcode_t       retval;
 263         size_t          bytes;
 264         ext2_ino_t      i;
 265
 266         if (hint) {
 267                 EXT2_CHECK_MAGIC(hint, EXT2_ET_MAGIC_ICOUNT);
 268                 if (hint->size > size)
 269                         size = (size_t) hint->size;
 270         }
 271
 272         retval = alloc_icount(fs, flags, &icount);
 273         if (retval)
 274                 return retval;
 275
 276         if (icount->fullmap)
 277                 goto successout;
 278
 279         if (size) {
 280                 icount->size = size;
 281         } else {
 282                 /*
 283                  * Figure out how many special case inode counts we will
 284                  * have.  We know we will need one for each directory;
 285                  * we also need to reserve some extra room for file links
 286                  */
 287                 retval = ext2fs_get_num_dirs(fs, &icount->size);
 288                 if (retval)
 289                         goto errout;
 290                 icount->size += fs->super->s_inodes_count / 50;
 291         }
 292
 293         bytes = (size_t) (icount->size * sizeof(struct ext2_icount_el));
 294 #if 0
 295         printf("Icount allocated %u entries, %d bytes.\n",
 296                icount->size, bytes);
 297 #endif
 298         retval = ext2fs_get_array(icount->size, sizeof(struct ext2_icount_el),
 299                          &icount->list);
 300         if (retval)
 301                 goto errout;
 302         memset(icount->list, 0, bytes);
 303
 304         icount->count = 0;
 305         icount->cursor = 0;
 306
 307         /*
 308          * Populate the sorted list with those entries which were
 309          * found in the hint icount (since those are ones which will
 310          * likely need to be in the sorted list this time around).
 311          */
 312         if (hint) {
 313                 for (i=0; i < hint->count; i++)
 314                         icount->list[i].ino = hint->list[i].ino;
 315                 icount->count = hint->count;
 316         }
 317
 318 successout:
 319         *ret = icount;
 320         return 0;
 321
 322 errout:
 323         ext2fs_free_icount(icount);
 324         return(retval);
 325 }
 326
 327 errcode_t ext2fs_create_icount(ext2_filsys fs, int flags,
 328                                unsigned int size,
 329                                ext2_icount_t *ret)
 330 {
 331         return ext2fs_create_icount2(fs, flags, size, 0, ret);
 332 }
 333
 334 /*
 335  * insert_icount_el() --- Insert a new entry into the sorted list at a
 336  *      specified position.
 337  */
 338 static struct ext2_icount_el *insert_icount_el(ext2_icount_t icount,
 339                                             ext2_ino_t ino, int pos)
 340 {
 341         struct ext2_icount_el   *el;
 342         errcode_t               retval;
 343         ext2_ino_t              new_size = 0;
 344         int                     num;
 345
 346         if (icount->last_lookup && icount->last_lookup->ino == ino)
 347                 return icount->last_lookup;
 348
 349         if (icount->count >= icount->size) {
 350                 if (icount->count) {
 351                         new_size = icount->list[(unsigned)icount->count-1].ino;
 352                         new_size = (ext2_ino_t) (icount->count *
 353                                 ((float) icount->num_inodes / new_size));
 354                 }
 355                 if (new_size < (icount->size + 100))
 356                         new_size = icount->size + 100;
 357 #if 0
 358                 printf("Reallocating icount %u entries...\n", new_size);
 359 #endif
 360                 retval = ext2fs_resize_mem((size_t) icount->size *
 361                                            sizeof(struct ext2_icount_el),
 362                                            (size_t) new_size *
 363                                            sizeof(struct ext2_icount_el),
 364                                            &icount->list);
 365                 if (retval)
 366                         return 0;
 367                 icount->size = new_size;
 368         }
 369         num = (int) icount->count - pos;
 370         if (num < 0)
 371                 return 0;       /* should never happen */
 372         if (num) {
 373                 memmove(&icount->list[pos+1], &icount->list[pos],
 374                         sizeof(struct ext2_icount_el) * num);
 375         }
 376         icount->count++;
 377         el = &icount->list[pos];
 378         el->count = 0;
 379         el->ino = ino;
 380         icount->last_lookup = el;
 381         return el;
 382 }
 383
 384 /*
 385  * get_icount_el() --- given an inode number, try to find icount
 386  *      information in the sorted list.  If the create flag is set,
 387  *      and we can't find an entry, create one in the sorted list.
 388  */
 389 static struct ext2_icount_el *get_icount_el(ext2_icount_t icount,
 390                                             ext2_ino_t ino, int create)
 391 {
 392         int     low, high, mid;
 393
 394         if (!icount || !icount->list)
 395                 return 0;
 396
 397         if (create && ((icount->count == 0) ||
 398                        (ino > icount->list[(unsigned)icount->count-1].ino))) {
 399                 return insert_icount_el(icount, ino, (unsigned) icount->count);
 400         }
 401         if (icount->count == 0)
 402                 return 0;
 403
 404         if (icount->cursor >= icount->count)
 405                 icount->cursor = 0;
 406         if (ino == icount->list[icount->cursor].ino)
 407                 return &icount->list[icount->cursor++];
 408 #if 0
 409         printf("Non-cursor get_icount_el: %u\n", ino);
 410 #endif
 411         low = 0;
 412         high = (int) icount->count-1;
 413         while (low <= high) {
 414                 mid = ((unsigned)low + (unsigned)high) >> 1;
 415                 if (ino == icount->list[mid].ino) {
 416                         icount->cursor = mid+1;
 417                         return &icount->list[mid];
 418                 }
 419                 if (ino < icount->list[mid].ino)
 420                         high = mid-1;
 421                 else
 422                         low = mid+1;
 423         }
 424         /*
 425          * If we need to create a new entry, it should be right at
 426          * low (where high will be left at low-1).
 427          */
 428         if (create)
 429                 return insert_icount_el(icount, ino, low);
 430         return 0;
 431 }
 432
 433 static errcode_t set_inode_count(ext2_icount_t icount, ext2_ino_t ino,
 434                                  __u32 count)
 435 {
 436         struct ext2_icount_el   *el;
 437 #ifdef CONFIG_TDB
 438         TDB_DATA key, data;
 439
 440         if (icount->tdb) {
 441                 key.dptr = (unsigned char *) &ino;
 442                 key.dsize = sizeof(ext2_ino_t);
 443                 data.dptr = (unsigned char *) &count;
 444                 data.dsize = sizeof(__u32);
 445                 if (count) {
 446                         if (tdb_store(icount->tdb, key, data, TDB_REPLACE))
 447                                 return tdb_error(icount->tdb) +
 448                                         EXT2_ET_TDB_SUCCESS;
 449                 } else {
 450                         if (tdb_delete(icount->tdb, key))
 451                                 return tdb_error(icount->tdb) +
 452                                         EXT2_ET_TDB_SUCCESS;
 453                 }
 454                 return 0;
 455         }
 456 #endif
 457         if (icount->fullmap) {
 458                 icount->fullmap[ino] = icount_16_xlate(count);
 459                 return 0;
 460         }
 461
 462         el = get_icount_el(icount, ino, 1);
 463         if (!el)
 464                 return EXT2_ET_NO_MEMORY;
 465
 466         el->count = count;
 467         return 0;
 468 }
 469
 470 static errcode_t get_inode_count(ext2_icount_t icount, ext2_ino_t ino,
 471                                  __u32 *count)
 472 {
 473         struct ext2_icount_el   *el;
 474 #ifdef CONFIG_TDB
 475         TDB_DATA key, data;
 476
 477         if (icount->tdb) {
 478                 key.dptr = (unsigned char *) &ino;
 479                 key.dsize = sizeof(ext2_ino_t);
 480
 481                 data = tdb_fetch(icount->tdb, key);
 482                 if (data.dptr == NULL) {
 483                         *count = 0;
 484                         return tdb_error(icount->tdb) + EXT2_ET_TDB_SUCCESS;
 485                 }
 486
 487                 *count = *((__u32 *) data.dptr);
 488                 free(data.dptr);
 489                 return 0;
 490         }
 491 #endif
 492         if (icount->fullmap) {
 493                 *count = icount->fullmap[ino];
 494                 return 0;
 495         }
 496
 497         el = get_icount_el(icount, ino, 0);
 498         if (!el) {
 499                 *count = 0;
 500                 return ENOENT;
 501         }
 502
 503         *count = el->count;
 504         return 0;
 505 }
 506
 507 errcode_t ext2fs_icount_validate(ext2_icount_t icount, FILE *out)
 508 {
 509         errcode_t       ret = 0;
 510         unsigned int    i;
 511         const char *bad = "bad icount";
 512
 513         EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
 514
 515         if (icount->count > icount->size) {
 516                 fprintf(out, "%s: count > size\n", bad);
 517                 return EXT2_ET_INVALID_ARGUMENT;
 518         }
 519         for (i=1; i < icount->count; i++) {
 520                 if (icount->list[i-1].ino >= icount->list[i].ino) {
 521                         fprintf(out, "%s: list[%d].ino=%u, list[%d].ino=%u\n",
 522                                 bad, i-1, icount->list[i-1].ino,
 523                                 i, icount->list[i].ino);
 524                         ret = EXT2_ET_INVALID_ARGUMENT;
 525                 }
 526         }
 527         return ret;
 528 }
 529
 530 errcode_t ext2fs_icount_fetch(ext2_icount_t icount, ext2_ino_t ino, __u16 *ret)
 531 {
 532         __u32   val;
 533         EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
 534
 535         if (!ino || (ino > icount->num_inodes))
 536                 return EXT2_ET_INVALID_ARGUMENT;
 537
 538         if (!icount->fullmap) {
 539                 if (ext2fs_test_inode_bitmap2(icount->single, ino)) {
 540                         *ret = 1;
 541                         return 0;
 542                 }
 543                 if (icount->multiple &&
 544                         !ext2fs_test_inode_bitmap2(icount->multiple, ino)) {
 545                         *ret = 0;
 546                         return 0;
 547                 }
 548         }
 549         get_inode_count(icount, ino, &val);
 550         *ret = icount_16_xlate(val);
 551         return 0;
 552 }
 553
 554 errcode_t ext2fs_icount_increment(ext2_icount_t icount, ext2_ino_t ino,
 555                                   __u16 *ret)
 556 {
 557         __u32                   curr_value;
 558
 559         EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
 560
 561         if (!ino || (ino > icount->num_inodes))
 562                 return EXT2_ET_INVALID_ARGUMENT;
 563
 564         if (icount->fullmap) {
 565                 curr_value = icount_16_xlate(icount->fullmap[ino] + 1);
 566                 icount->fullmap[ino] = curr_value;
 567         } else if (ext2fs_test_inode_bitmap2(icount->single, ino)) {
 568                 /*
 569                  * If the existing count is 1, then we know there is
 570                  * no entry in the list.
 571                  */
 572                 if (set_inode_count(icount, ino, 2))
 573                         return EXT2_ET_NO_MEMORY;
 574                 curr_value = 2;
 575                 ext2fs_unmark_inode_bitmap2(icount->single, ino);
 576         } else if (icount->multiple) {
 577                 /*
 578                  * The count is either zero or greater than 1; if the
 579                  * inode is set in icount->multiple, then there should
 580                  * be an entry in the list, so we need to fix it.
 581                  */
 582                 if (ext2fs_test_inode_bitmap2(icount->multiple, ino)) {
 583                         get_inode_count(icount, ino, &curr_value);
 584                         curr_value++;
 585                         if (set_inode_count(icount, ino, curr_value))
 586                                 return EXT2_ET_NO_MEMORY;
 587                 } else {
 588                         /*
 589                          * The count was zero; mark the single bitmap
 590                          * and return.
 591                          */
 592                         ext2fs_mark_inode_bitmap2(icount->single, ino);
 593                         if (ret)
 594                                 *ret = 1;
 595                         return 0;
 596                 }
 597         } else {
 598                 /*
 599                  * The count is either zero or greater than 1; try to
 600                  * find an entry in the list to determine which.
 601                  */
 602                 get_inode_count(icount, ino, &curr_value);
 603                 curr_value++;
 604                 if (set_inode_count(icount, ino, curr_value))
 605                         return EXT2_ET_NO_MEMORY;
 606         }
 607         if (icount->multiple)
 608                 ext2fs_mark_inode_bitmap2(icount->multiple, ino);
 609         if (ret)
 610                 *ret = icount_16_xlate(curr_value);
 611         return 0;
 612 }
 613
 614 errcode_t ext2fs_icount_decrement(ext2_icount_t icount, ext2_ino_t ino,
 615                                   __u16 *ret)
 616 {
 617         __u32                   curr_value;
 618
 619         if (!ino || (ino > icount->num_inodes))
 620                 return EXT2_ET_INVALID_ARGUMENT;
 621
 622         EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
 623
 624         if (icount->fullmap) {
 625                 if (!icount->fullmap[ino])
 626                         return EXT2_ET_INVALID_ARGUMENT;
 627
 628                 curr_value = --icount->fullmap[ino];
 629                 if (ret)
 630                         *ret = icount_16_xlate(curr_value);
 631                 return 0;
 632         }
 633
 634         if (ext2fs_test_inode_bitmap2(icount->single, ino)) {
 635                 ext2fs_unmark_inode_bitmap2(icount->single, ino);
 636                 if (icount->multiple)
 637                         ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
 638                 else {
 639                         set_inode_count(icount, ino, 0);
 640                 }
 641                 if (ret)
 642                         *ret = 0;
 643                 return 0;
 644         }
 645
 646         if (icount->multiple &&
 647             !ext2fs_test_inode_bitmap2(icount->multiple, ino))
 648                 return EXT2_ET_INVALID_ARGUMENT;
 649
 650         get_inode_count(icount, ino, &curr_value);
 651         if (!curr_value)
 652                 return EXT2_ET_INVALID_ARGUMENT;
 653         curr_value--;
 654         if (set_inode_count(icount, ino, curr_value))
 655                 return EXT2_ET_NO_MEMORY;
 656
 657         if (curr_value == 1)
 658                 ext2fs_mark_inode_bitmap2(icount->single, ino);
 659         if ((curr_value == 0) && icount->multiple)
 660                 ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
 661
 662         if (ret)
 663                 *ret = icount_16_xlate(curr_value);
 664         return 0;
 665 }
 666
 667 errcode_t ext2fs_icount_store(ext2_icount_t icount, ext2_ino_t ino,
 668                               __u16 count)
 669 {
 670         if (!ino || (ino > icount->num_inodes))
 671                 return EXT2_ET_INVALID_ARGUMENT;
 672
 673         EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
 674
 675         if (icount->fullmap)
 676                 return set_inode_count(icount, ino, count);
 677
 678         if (count == 1) {
 679                 ext2fs_mark_inode_bitmap2(icount->single, ino);
 680                 if (icount->multiple)
 681                         ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
 682                 return 0;
 683         }
 684         if (count == 0) {
 685                 ext2fs_unmark_inode_bitmap2(icount->single, ino);
 686                 if (icount->multiple) {
 687                         /*
 688                          * If the icount->multiple bitmap is enabled,
 689                          * we can just clear both bitmaps and we're done
 690                          */
 691                         ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
 692                 } else
 693                         set_inode_count(icount, ino, 0);
 694                 return 0;
 695         }
 696
 697         if (set_inode_count(icount, ino, count))
 698                 return EXT2_ET_NO_MEMORY;
 699         ext2fs_unmark_inode_bitmap2(icount->single, ino);
 700         if (icount->multiple)
 701                 ext2fs_mark_inode_bitmap2(icount->multiple, ino);
 702         return 0;
 703 }
 704
 705 errcode_t ext2fs_icount_merge_full_map(ext2_icount_t src, ext2_icount_t dest)
 706 {
 707         /* TODO: add the support for full map */
 708         return EOPNOTSUPP;
 709 }
 710
 711 errcode_t ext2fs_icount_merge_el(ext2_icount_t src, ext2_icount_t dest)
 712 {
 713         int                      src_count = src->count;
 714         int                      dest_count = dest->count;
 715         int                      size = src_count + dest_count;
 716         int                      size_entry = sizeof(struct ext2_icount_el);
 717         struct ext2_icount_el   *array;
 718         struct ext2_icount_el   *array_ptr;
 719         struct ext2_icount_el   *src_array = src->list;
 720         struct ext2_icount_el   *dest_array = dest->list;
 721         int                      src_index = 0;
 722         int                      dest_index = 0;
 723         errcode_t                retval;
 724
 725         if (src_count == 0)
 726                 return 0;
 727
 728         retval = ext2fs_get_array(size, size_entry, &array);
 729         if (retval)
 730                 return retval;
 731
 732         array_ptr = array;
 733         /*
 734          * This can be improved by binary search and memcpy, but codes
 735          * would be more complex. And if number of bad blocks is small,
 736          * the optimization won't improve performance a lot.
 737          */
 738         while (src_index < src_count || dest_index < dest_count) {
 739                 if (src_index >= src_count) {
 740                         memcpy(array_ptr, &dest_array[dest_index],
 741                                (dest_count - dest_index) * size_entry);
 742                         break;
 743                 }
 744                 if (dest_index >= dest_count) {
 745                         memcpy(array_ptr, &src_array[src_index],
 746                                (src_count - src_index) * size_entry);
 747                         break;
 748                 }
 749                 if (src_array[src_index].ino < dest_array[dest_index].ino) {
 750                         *array_ptr = src_array[src_index];
 751                         src_index++;
 752                 } else {
 753                         assert(src_array[src_index].ino >
 754                                dest_array[dest_index].ino);
 755                         *array_ptr = dest_array[dest_index];
 756                         dest_index++;
 757                 }
 758                 array_ptr++;
 759         }
 760
 761         ext2fs_free_mem(&dest->list);
 762         dest->list = array;
 763         dest->count = src_count + dest_count;
 764         dest->size = size;
 765         dest->last_lookup = NULL;
 766         return 0;
 767 }
 768
 769 errcode_t ext2fs_icount_merge(ext2_icount_t src, ext2_icount_t dest)
 770 {
 771         errcode_t       retval;
 772
 773         if (src->fullmap && !dest->fullmap)
 774                 return EINVAL;
 775
 776         if (!src->fullmap && dest->fullmap)
 777                 return EINVAL;
 778
 779         if (src->multiple && !dest->multiple)
 780                 return EINVAL;
 781
 782         if (!src->multiple && dest->multiple)
 783                 return EINVAL;
 784
 785         if (src->fullmap)
 786                 return ext2fs_icount_merge_full_map(src, dest);
 787
 788         retval = ext2fs_merge_bitmap(src->single, dest->single, NULL,
 789                                      NULL);
 790         if (retval)
 791                 return retval;
 792
 793         if (src->multiple) {
 794                 retval = ext2fs_merge_bitmap(src->multiple, dest->multiple,
 795                                              NULL, NULL);
 796                 if (retval)
 797                         return retval;
 798         }
 799
 800         retval = ext2fs_icount_merge_el(src, dest);
 801         if (retval)
 802                 return retval;
 803
 804         return 0;
 805 }
 806
 807 ext2_ino_t ext2fs_get_icount_size(ext2_icount_t icount)
 808 {
 809         if (!icount || icount->magic != EXT2_ET_MAGIC_ICOUNT)
 810                 return 0;
 811
 812         return icount->size;
 813 }
 814
 815 #ifdef DEBUG
 816
 817 ext2_filsys     test_fs;
 818 ext2_icount_t   icount;
 819
 820 #define EXIT            0x00
 821 #define FETCH           0x01
 822 #define STORE           0x02
 823 #define INCREMENT       0x03
 824 #define DECREMENT       0x04
 825
 826 struct test_program {
 827         int             cmd;
 828         ext2_ino_t      ino;
 829         __u16           arg;
 830         __u16           expected;
 831 };
 832
 833 struct test_program prog[] = {
 834         { STORE, 42, 42, 42 },
 835         { STORE, 1,  1, 1 },
 836         { STORE, 2,  2, 2 },
 837         { STORE, 3,  3, 3 },
 838         { STORE, 10, 1, 1 },
 839         { STORE, 42, 0, 0 },
 840         { INCREMENT, 5, 0, 1 },
 841         { INCREMENT, 5, 0, 2 },
 842         { INCREMENT, 5, 0, 3 },
 843         { INCREMENT, 5, 0, 4 },
 844         { DECREMENT, 5, 0, 3 },
 845         { DECREMENT, 5, 0, 2 },
 846         { DECREMENT, 5, 0, 1 },
 847         { DECREMENT, 5, 0, 0 },
 848         { FETCH, 10, 0, 1 },
 849         { FETCH, 1, 0, 1 },
 850         { FETCH, 2, 0, 2 },
 851         { FETCH, 3, 0, 3 },
 852         { INCREMENT, 1, 0, 2 },
 853         { DECREMENT, 2, 0, 1 },
 854         { DECREMENT, 2, 0, 0 },
 855         { FETCH, 12, 0, 0 },
 856         { EXIT, 0, 0, 0 }
 857 };
 858
 859 struct test_program extended[] = {
 860         { STORE, 1,  1, 1 },
 861         { STORE, 2,  2, 2 },
 862         { STORE, 3,  3, 3 },
 863         { STORE, 4,  4, 4 },
 864         { STORE, 5,  5, 5 },
 865         { STORE, 6,  1, 1 },
 866         { STORE, 7,  2, 2 },
 867         { STORE, 8,  3, 3 },
 868         { STORE, 9,  4, 4 },
 869         { STORE, 10, 5, 5 },
 870         { STORE, 11, 1, 1 },
 871         { STORE, 12, 2, 2 },
 872         { STORE, 13, 3, 3 },
 873         { STORE, 14, 4, 4 },
 874         { STORE, 15, 5, 5 },
 875         { STORE, 16, 1, 1 },
 876         { STORE, 17, 2, 2 },
 877         { STORE, 18, 3, 3 },
 878         { STORE, 19, 4, 4 },
 879         { STORE, 20, 5, 5 },
 880         { STORE, 21, 1, 1 },
 881         { STORE, 22, 2, 2 },
 882         { STORE, 23, 3, 3 },
 883         { STORE, 24, 4, 4 },
 884         { STORE, 25, 5, 5 },
 885         { STORE, 26, 1, 1 },
 886         { STORE, 27, 2, 2 },
 887         { STORE, 28, 3, 3 },
 888         { STORE, 29, 4, 4 },
 889         { STORE, 30, 5, 5 },
 890         { EXIT, 0, 0, 0 }
 891 };
 892
 893 /*
 894  * Setup the variables for doing the inode scan test.
 895  */
 896 static void setup(void)
 897 {
 898         errcode_t       retval;
 899         struct ext2_super_block param;
 900
 901         initialize_ext2_error_table();
 902
 903         memset(&param, 0, sizeof(param));
 904         ext2fs_blocks_count_set(&param, 12000);
 905
 906         retval = ext2fs_initialize("test fs", EXT2_FLAG_64BITS, &param,
 907                                    test_io_manager, &test_fs);
 908         if (retval) {
 909                 com_err("setup", retval,
 910                         "while initializing filesystem");
 911                 exit(1);
 912         }
 913         retval = ext2fs_allocate_tables(test_fs);
 914         if (retval) {
 915                 com_err("setup", retval,
 916                         "while allocating tables for test filesystem");
 917                 exit(1);
 918         }
 919 }
 920
 921 int run_test(int flags, int size, char *dir, struct test_program *prog)
 922 {
 923         errcode_t       retval;
 924         ext2_icount_t   icount;
 925         struct test_program *pc;
 926         __u16           result;
 927         int             problem = 0;
 928
 929         if (dir) {
 930 #ifdef CONFIG_TDB
 931                 retval = ext2fs_create_icount_tdb(test_fs, dir,
 932                                                   flags, &icount);
 933                 if (retval) {
 934                         com_err("run_test", retval,
 935                                 "while creating icount using tdb");
 936                         exit(1);
 937                 }
 938 #else
 939                 printf("Skipped\n");
 940                 return 0;
 941 #endif
 942         } else {
 943                 retval = ext2fs_create_icount2(test_fs, flags, size, 0,
 944                                                &icount);
 945                 if (retval) {
 946                         com_err("run_test", retval, "while creating icount");
 947                         exit(1);
 948                 }
 949         }
 950         for (pc = prog; pc->cmd != EXIT; pc++) {
 951                 switch (pc->cmd) {
 952                 case FETCH:
 953                         printf("icount_fetch(%u) = ", pc->ino);
 954                         break;
 955                 case STORE:
 956                         retval = ext2fs_icount_store(icount, pc->ino, pc->arg);
 957                         if (retval) {
 958                                 com_err("run_test", retval,
 959                                         "while calling icount_store");
 960                                 exit(1);
 961                         }
 962                         printf("icount_store(%u, %u) = ", pc->ino, pc->arg);
 963                         break;
 964                 case INCREMENT:
 965                         retval = ext2fs_icount_increment(icount, pc->ino, 0);
 966                         if (retval) {
 967                                 com_err("run_test", retval,
 968                                         "while calling icount_increment");
 969                                 exit(1);
 970                         }
 971                         printf("icount_increment(%u) = ", pc->ino);
 972                         break;
 973                 case DECREMENT:
 974                         retval = ext2fs_icount_decrement(icount, pc->ino, 0);
 975                         if (retval) {
 976                                 com_err("run_test", retval,
 977                                         "while calling icount_decrement");
 978                                 exit(1);
 979                         }
 980                         printf("icount_decrement(%u) = ", pc->ino);
 981                         break;
 982                 }
 983                 retval = ext2fs_icount_fetch(icount, pc->ino, &result);
 984                 if (retval) {
 985                         com_err("run_test", retval,
 986                                 "while calling icount_fetch");
 987                         exit(1);
 988                 }
 989                 printf("%u (%s)\n", result, (result == pc->expected) ?
 990                        "OK" : "NOT OK");
 991                 if (result != pc->expected)
 992                         problem++;
 993         }
 994         printf("icount size is %u\n", ext2fs_get_icount_size(icount));
 995         retval = ext2fs_icount_validate(icount, stdout);
 996         if (retval) {
 997                 com_err("run_test", retval, "while calling icount_validate");
 998                 exit(1);
 999         }
1000         ext2fs_free_icount(icount);
1001         return problem;
1002 }
1003
1004
1005 int main(int argc, char **argv)
1006 {
1007         int failed = 0;
1008
1009         setup();
1010         printf("Standard icount run:\n");
1011         failed += run_test(0, 0, 0, prog);
1012         printf("\nMultiple bitmap test:\n");
1013         failed += run_test(EXT2_ICOUNT_OPT_INCREMENT, 0, 0, prog);
1014         printf("\nResizing icount:\n");
1015         failed += run_test(0, 3, 0, extended);
1016         printf("\nStandard icount run with tdb:\n");
1017         failed += run_test(0, 0, ".", prog);
1018         printf("\nMultiple bitmap test with tdb:\n");
1019         failed += run_test(EXT2_ICOUNT_OPT_INCREMENT, 0, ".", prog);
1020         if (failed)
1021                 printf("FAILED!\n");
1022         return failed;
1023 }
1024 #endif