lib/ext2fs/initialize.c

   1 /*
   2  * initialize.c --- initialize a filesystem handle given superblock
   3  *      parameters.  Used by mke2fs when initializing a filesystem.
   4  *
   5  * Copyright (C) 1994, 1995, 1996 Theodore Ts'o.
   6  *
   7  * %Begin-Header%
   8  * This file may be redistributed under the terms of the GNU Library
   9  * General Public License, version 2.
  10  * %End-Header%
  11  */
  12
  13 #include "config.h"
  14 #include <stdio.h>
  15 #include <string.h>
  16 #if HAVE_UNISTD_H
  17 #include <unistd.h>
  18 #endif
  19 #include <fcntl.h>
  20 #include <time.h>
  21 #if HAVE_SYS_STAT_H
  22 #include <sys/stat.h>
  23 #endif
  24 #if HAVE_SYS_TYPES_H
  25 #include <sys/types.h>
  26 #endif
  27
  28 #include "ext2_fs.h"
  29 #include "ext2fs.h"
  30
  31 #ifndef O_BINARY
  32 #define O_BINARY 0
  33 #endif
  34
  35 #if defined(__linux__)    &&    defined(EXT2_OS_LINUX)
  36 #define CREATOR_OS EXT2_OS_LINUX
  37 #else
  38 #if defined(__GNU__)     &&     defined(EXT2_OS_HURD)
  39 #define CREATOR_OS EXT2_OS_HURD
  40 #else
  41 #if defined(__FreeBSD__) &&     defined(EXT2_OS_FREEBSD)
  42 #define CREATOR_OS EXT2_OS_FREEBSD
  43 #else
  44 #if defined(LITES)         &&   defined(EXT2_OS_LITES)
  45 #define CREATOR_OS EXT2_OS_LITES
  46 #else
  47 #define CREATOR_OS EXT2_OS_LINUX /* by default */
  48 #endif /* defined(LITES) && defined(EXT2_OS_LITES) */
  49 #endif /* defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) */
  50 #endif /* defined(__GNU__)     && defined(EXT2_OS_HURD) */
  51 #endif /* defined(__linux__)   && defined(EXT2_OS_LINUX) */
  52
  53 /*
  54  * Calculate the number of GDT blocks to reserve for online filesystem growth.
  55  * The absolute maximum number of GDT blocks we can reserve is determined by
  56  * the number of block pointers that can fit into a single block.
  57  */
  58 static unsigned int calc_reserved_gdt_blocks(ext2_filsys fs)
  59 {
  60         struct ext2_super_block *sb = fs->super;
  61         unsigned long bpg = sb->s_blocks_per_group;
  62         unsigned int gdpb = EXT2_DESC_PER_BLOCK(sb);
  63         unsigned long max_blocks = 0xffffffff;
  64         unsigned long rsv_groups;
  65         unsigned int rsv_gdb;
  66
  67         /* We set it at 1024x the current filesystem size, or
  68          * the upper block count limit (2^32), whichever is lower.
  69          */
  70         if (ext2fs_blocks_count(sb) < max_blocks / 1024)
  71                 max_blocks = ext2fs_blocks_count(sb) * 1024;
  72         /*
  73          * ext2fs_div64_ceil() is unnecessary because max_blocks is
  74          * max _GDT_ blocks, which is limited to 32 bits.
  75          */
  76         rsv_groups = ext2fs_div_ceil(max_blocks - sb->s_first_data_block, bpg);
  77         rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) - fs->desc_blocks;
  78         if (rsv_gdb > EXT2_ADDR_PER_BLOCK(sb))
  79                 rsv_gdb = EXT2_ADDR_PER_BLOCK(sb);
  80 #ifdef RES_GDT_DEBUG
  81         printf("max_blocks %lu, rsv_groups = %lu, rsv_gdb = %u\n",
  82                max_blocks, rsv_groups, rsv_gdb);
  83 #endif
  84
  85         return rsv_gdb;
  86 }
  87
  88 errcode_t ext2fs_initialize(const char *name, int flags,
  89                             struct ext2_super_block *param,
  90                             io_manager manager, ext2_filsys *ret_fs)
  91 {
  92         ext2_filsys     fs;
  93         errcode_t       retval;
  94         struct ext2_super_block *super;
  95         unsigned int    rem;
  96         unsigned int    overhead = 0;
  97         unsigned int    ipg;
  98         dgrp_t          i;
  99         blk64_t         free_blocks;
 100         blk_t           numblocks;
 101         int             rsv_gdt;
 102         int             csum_flag;
 103         int             bigalloc_flag;
 104         int             io_flags;
 105         int             has_bg;
 106         unsigned        reserved_inos;
 107         char            *buf = 0;
 108         char            c;
 109         double          reserved_ratio;
 110         char            *time_env;
 111
 112         if (!param || !ext2fs_blocks_count(param))
 113                 return EXT2_ET_INVALID_ARGUMENT;
 114
 115         retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
 116         if (retval)
 117                 return retval;
 118
 119         memset(fs, 0, sizeof(struct struct_ext2_filsys));
 120         fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
 121         fs->flags = flags | EXT2_FLAG_RW;
 122         fs->umask = 022;
 123         fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
 124 #ifdef WORDS_BIGENDIAN
 125         fs->flags |= EXT2_FLAG_SWAP_BYTES;
 126 #endif
 127
 128         time_env = getenv("E2FSPROGS_FAKE_TIME");
 129         if (time_env)
 130                 fs->now = strtoul(time_env, NULL, 0);
 131
 132         io_flags = IO_FLAG_RW;
 133         if (flags & EXT2_FLAG_EXCLUSIVE)
 134                 io_flags |= IO_FLAG_EXCLUSIVE;
 135         if (flags & EXT2_FLAG_DIRECT_IO)
 136                 io_flags |= IO_FLAG_DIRECT_IO;
 137         io_flags |= O_BINARY;
 138         retval = manager->open(name, io_flags, &fs->io);
 139         if (retval)
 140                 goto cleanup;
 141         fs->image_io = fs->io;
 142         fs->io->app_data = fs;
 143         retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
 144         if (retval)
 145                 goto cleanup;
 146
 147         strcpy(fs->device_name, name);
 148         retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
 149         if (retval)
 150                 goto cleanup;
 151         fs->super = super;
 152
 153         memset(super, 0, SUPERBLOCK_SIZE);
 154
 155 #define set_field(field, default) (super->field = param->field ? \
 156                                    param->field : (default))
 157 #define assign_field(field)     (super->field = param->field)
 158
 159         super->s_magic = EXT2_SUPER_MAGIC;
 160         super->s_state = EXT2_VALID_FS;
 161
 162         bigalloc_flag = ext2fs_has_feature_bigalloc(param);
 163
 164         assign_field(s_log_block_size);
 165
 166         if (bigalloc_flag) {
 167                 set_field(s_log_cluster_size, super->s_log_block_size+4);
 168                 if (super->s_log_block_size > super->s_log_cluster_size) {
 169                         retval = EXT2_ET_INVALID_ARGUMENT;
 170                         goto cleanup;
 171                 }
 172         } else
 173                 super->s_log_cluster_size = super->s_log_block_size;
 174
 175         set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1);
 176         set_field(s_max_mnt_count, 0);
 177         set_field(s_errors, EXT2_ERRORS_DEFAULT);
 178         set_field(s_feature_compat, 0);
 179         set_field(s_feature_incompat, 0);
 180         set_field(s_feature_ro_compat, 0);
 181         set_field(s_default_mount_opts, 0);
 182         set_field(s_first_meta_bg, 0);
 183         set_field(s_raid_stride, 0);            /* default stride size: 0 */
 184         set_field(s_raid_stripe_width, 0);      /* default stripe width: 0 */
 185         set_field(s_log_groups_per_flex, 0);
 186         set_field(s_flags, 0);
 187         assign_field(s_backup_bgs[0]);
 188         assign_field(s_backup_bgs[1]);
 189
 190         assign_field(s_encoding);
 191         assign_field(s_encoding_flags);
 192
 193         if (ext2fs_has_feature_fname_encoding(param))
 194                 fs->encoding = ext2fs_load_nls_table(param->s_encoding);
 195
 196         if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
 197                 retval = EXT2_ET_UNSUPP_FEATURE;
 198                 goto cleanup;
 199         }
 200         if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
 201                 retval = EXT2_ET_RO_UNSUPP_FEATURE;
 202                 goto cleanup;
 203         }
 204
 205         set_field(s_rev_level, EXT2_GOOD_OLD_REV);
 206         if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
 207                 set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
 208                 set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
 209                 if (super->s_inode_size >= sizeof(struct ext2_inode_large)) {
 210                         int extra_isize = sizeof(struct ext2_inode_large) -
 211                                 EXT2_GOOD_OLD_INODE_SIZE;
 212                         set_field(s_min_extra_isize, extra_isize);
 213                         set_field(s_want_extra_isize, extra_isize);
 214                 }
 215         } else {
 216                 super->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
 217                 super->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
 218         }
 219
 220         set_field(s_checkinterval, 0);
 221         super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);
 222
 223         super->s_creator_os = CREATOR_OS;
 224
 225         fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(super);
 226         fs->cluster_ratio_bits = super->s_log_cluster_size -
 227                 super->s_log_block_size;
 228
 229         if (bigalloc_flag) {
 230                 unsigned long long bpg;
 231
 232                 if (param->s_blocks_per_group &&
 233                     param->s_clusters_per_group &&
 234                     ((param->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs)) !=
 235                      param->s_blocks_per_group)) {
 236                         retval = EXT2_ET_INVALID_ARGUMENT;
 237                         goto cleanup;
 238                 }
 239                 if (param->s_clusters_per_group)
 240                         assign_field(s_clusters_per_group);
 241                 else if (param->s_blocks_per_group)
 242                         super->s_clusters_per_group =
 243                                 param->s_blocks_per_group /
 244                                 EXT2FS_CLUSTER_RATIO(fs);
 245                 else if (super->s_log_cluster_size + 15 < 32)
 246                         super->s_clusters_per_group = fs->blocksize * 8;
 247                 else
 248                         super->s_clusters_per_group = (fs->blocksize - 1) * 8;
 249                 if (super->s_clusters_per_group > EXT2_MAX_CLUSTERS_PER_GROUP(super))
 250                         super->s_clusters_per_group = EXT2_MAX_CLUSTERS_PER_GROUP(super);
 251                 bpg = EXT2FS_C2B(fs,
 252                         (unsigned long long) super->s_clusters_per_group);
 253                 if (bpg >= (((unsigned long long) 1) << 32)) {
 254                         retval = EXT2_ET_INVALID_ARGUMENT;
 255                         goto cleanup;
 256                 }
 257                 super->s_blocks_per_group = bpg;
 258         } else {
 259                 set_field(s_blocks_per_group, fs->blocksize * 8);
 260                 if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
 261                         super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
 262                 super->s_clusters_per_group = super->s_blocks_per_group;
 263         }
 264
 265         ext2fs_blocks_count_set(super, ext2fs_blocks_count(param) &
 266                                 ~((blk64_t) EXT2FS_CLUSTER_MASK(fs)));
 267         ext2fs_r_blocks_count_set(super, ext2fs_r_blocks_count(param));
 268         if (ext2fs_r_blocks_count(super) >= ext2fs_blocks_count(param)) {
 269                 retval = EXT2_ET_INVALID_ARGUMENT;
 270                 goto cleanup;
 271         }
 272
 273         set_field(s_mmp_update_interval, 0);
 274
 275         /*
 276          * If we're creating an external journal device, we don't need
 277          * to bother with the rest.
 278          */
 279         if (ext2fs_has_feature_journal_dev(super)) {
 280                 fs->group_desc_count = 0;
 281                 ext2fs_mark_super_dirty(fs);
 282                 *ret_fs = fs;
 283                 return 0;
 284         }
 285
 286 retry:
 287         fs->group_desc_count = (dgrp_t) ext2fs_div64_ceil(
 288                 ext2fs_blocks_count(super) - super->s_first_data_block,
 289                 EXT2_BLOCKS_PER_GROUP(super));
 290         if (fs->group_desc_count == 0) {
 291                 retval = EXT2_ET_TOOSMALL;
 292                 goto cleanup;
 293         }
 294
 295         set_field(s_desc_size,
 296                   ext2fs_has_feature_64bit(super) ?
 297                   EXT2_MIN_DESC_SIZE_64BIT : 0);
 298
 299         fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
 300                                           EXT2_DESC_PER_BLOCK(super));
 301
 302         i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
 303
 304         if (ext2fs_has_feature_64bit(super) &&
 305             (ext2fs_blocks_count(super) / i) >= (1ULL << 32))
 306                 set_field(s_inodes_count, ~0U);
 307         else
 308                 set_field(s_inodes_count, ext2fs_blocks_count(super) / i);
 309
 310         /*
 311          * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
 312          * that we have enough inodes for the filesystem(!)
 313          */
 314         if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
 315                 super->s_inodes_count = EXT2_FIRST_INODE(super)+1;
 316
 317         /*
 318          * There should be at least as many inodes as the user
 319          * requested.  Figure out how many inodes per group that
 320          * should be.  But make sure that we don't allocate more than
 321          * one bitmap's worth of inodes each group.
 322          */
 323         ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
 324         if (ipg > fs->blocksize * 8) {
 325                 if (!bigalloc_flag && super->s_blocks_per_group >= 256) {
 326                         /* Try again with slightly different parameters */
 327                         super->s_blocks_per_group -= 8;
 328                         ext2fs_blocks_count_set(super,
 329                                                 ext2fs_blocks_count(param));
 330                         super->s_clusters_per_group = super->s_blocks_per_group;
 331                         goto retry;
 332                 } else {
 333                         retval = EXT2_ET_TOO_MANY_INODES;
 334                         goto cleanup;
 335                 }
 336         }
 337
 338         if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
 339                 ipg = EXT2_MAX_INODES_PER_GROUP(super);
 340
 341 ipg_retry:
 342         super->s_inodes_per_group = ipg;
 343
 344         /*
 345          * Make sure the number of inodes per group completely fills
 346          * the inode table blocks in the descriptor.  If not, add some
 347          * additional inodes/group.  Waste not, want not...
 348          */
 349         fs->inode_blocks_per_group = (((super->s_inodes_per_group *
 350                                         EXT2_INODE_SIZE(super)) +
 351                                        EXT2_BLOCK_SIZE(super) - 1) /
 352                                       EXT2_BLOCK_SIZE(super));
 353         super->s_inodes_per_group = ((fs->inode_blocks_per_group *
 354                                       EXT2_BLOCK_SIZE(super)) /
 355                                      EXT2_INODE_SIZE(super));
 356         /*
 357          * Finally, make sure the number of inodes per group is a
 358          * multiple of 8.  This is needed to simplify the bitmap
 359          * splicing code.
 360          */
 361         if (super->s_inodes_per_group < 8)
 362                 super->s_inodes_per_group = 8;
 363         super->s_inodes_per_group &= ~7;
 364         fs->inode_blocks_per_group = (((super->s_inodes_per_group *
 365                                         EXT2_INODE_SIZE(super)) +
 366                                        EXT2_BLOCK_SIZE(super) - 1) /
 367                                       EXT2_BLOCK_SIZE(super));
 368
 369         /*
 370          * adjust inode count to reflect the adjusted inodes_per_group
 371          */
 372         if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
 373                 ipg--;
 374                 goto ipg_retry;
 375         }
 376         super->s_inodes_count = super->s_inodes_per_group *
 377                 fs->group_desc_count;
 378         super->s_free_inodes_count = super->s_inodes_count;
 379
 380         /*
 381          * check the number of reserved group descriptor table blocks
 382          */
 383         if (ext2fs_has_feature_resize_inode(super))
 384                 rsv_gdt = calc_reserved_gdt_blocks(fs);
 385         else
 386                 rsv_gdt = 0;
 387         set_field(s_reserved_gdt_blocks, rsv_gdt);
 388         if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
 389                 retval = EXT2_ET_RES_GDT_BLOCKS;
 390                 goto cleanup;
 391         }
 392         /* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
 393         if (super->s_reserved_gdt_blocks + fs->desc_blocks >
 394             super->s_blocks_per_group * 3 / 4) {
 395                 ext2fs_set_feature_meta_bg(fs->super);
 396                 ext2fs_clear_feature_resize_inode(fs->super);
 397                 set_field(s_reserved_gdt_blocks, 0);
 398         }
 399
 400         /*
 401          * Calculate the maximum number of bookkeeping blocks per
 402          * group.  It includes the superblock, the block group
 403          * descriptors, the block bitmap, the inode bitmap, the inode
 404          * table, and the reserved gdt blocks.
 405          */
 406         overhead = (int) (3 + fs->inode_blocks_per_group +
 407                           super->s_reserved_gdt_blocks);
 408
 409         if (ext2fs_has_feature_meta_bg(fs->super))
 410                 overhead++;
 411         else
 412                 overhead += fs->desc_blocks;
 413
 414         /* This can only happen if the user requested too many inodes */
 415         if (overhead > super->s_blocks_per_group) {
 416                 retval = EXT2_ET_TOO_MANY_INODES;
 417                 goto cleanup;
 418         }
 419
 420         /*
 421          * See if the last group is big enough to support the
 422          * necessary data structures.  If not, we need to get rid of
 423          * it.  We need to recalculate the overhead for the last block
 424          * group, since it might or might not have a superblock
 425          * backup.
 426          */
 427         overhead = (int) (2 + fs->inode_blocks_per_group);
 428         has_bg = 0;
 429         if (ext2fs_has_feature_sparse_super2(super)) {
 430                 /*
 431                  * We have to do this manually since
 432                  * super->s_backup_bgs hasn't been set up yet.
 433                  */
 434                 if (fs->group_desc_count == 2)
 435                         has_bg = param->s_backup_bgs[0] != 0;
 436                 else
 437                         has_bg = param->s_backup_bgs[1] != 0;
 438         } else
 439                 has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
 440         if (has_bg)
 441                 overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;
 442         rem = ((ext2fs_blocks_count(super) - super->s_first_data_block) %
 443                super->s_blocks_per_group);
 444         if ((fs->group_desc_count == 1) && rem && (rem < overhead)) {
 445                 retval = EXT2_ET_TOOSMALL;
 446                 goto cleanup;
 447         }
 448         if (rem && (rem < overhead+50)) {
 449                 ext2fs_blocks_count_set(super, ext2fs_blocks_count(super) -
 450                                         rem);
 451                 /*
 452                  * If blocks count is changed, we need to recalculate
 453                  * reserved blocks count not to exceed 50%.
 454                  */
 455                 reserved_ratio = 100.0 * ext2fs_r_blocks_count(param) /
 456                         ext2fs_blocks_count(param);
 457                 ext2fs_r_blocks_count_set(super, reserved_ratio *
 458                         ext2fs_blocks_count(super) / 100.0);
 459
 460                 goto retry;
 461         }
 462
 463         /*
 464          * At this point we know how big the filesystem will be.  So
 465          * we can do any and all allocations that depend on the block
 466          * count.
 467          */
 468
 469         /* Set up the locations of the backup superblocks */
 470         if (ext2fs_has_feature_sparse_super2(super)) {
 471                 if (super->s_backup_bgs[0] >= fs->group_desc_count)
 472                         super->s_backup_bgs[0] = fs->group_desc_count - 1;
 473                 if (super->s_backup_bgs[1] >= fs->group_desc_count)
 474                         super->s_backup_bgs[1] = fs->group_desc_count - 1;
 475                 if (super->s_backup_bgs[0] == super->s_backup_bgs[1])
 476                         super->s_backup_bgs[1] = 0;
 477                 if (super->s_backup_bgs[0] > super->s_backup_bgs[1]) {
 478                         __u32 t = super->s_backup_bgs[0];
 479                         super->s_backup_bgs[0] = super->s_backup_bgs[1];
 480                         super->s_backup_bgs[1] = t;
 481                 }
 482         }
 483
 484         retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
 485         if (retval)
 486                 goto cleanup;
 487
 488         strcpy(buf, "block bitmap for ");
 489         strcat(buf, fs->device_name);
 490         retval = ext2fs_allocate_subcluster_bitmap(fs, buf, &fs->block_map);
 491         if (retval)
 492                 goto cleanup;
 493
 494         strcpy(buf, "inode bitmap for ");
 495         strcat(buf, fs->device_name);
 496         retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
 497         if (retval)
 498                 goto cleanup;
 499
 500         ext2fs_free_mem(&buf);
 501
 502         retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
 503                                 &fs->group_desc);
 504         if (retval)
 505                 goto cleanup;
 506
 507         memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);
 508
 509         /*
 510          * Reserve the superblock and group descriptors for each
 511          * group, and fill in the correct group statistics for group.
 512          * Note that although the block bitmap, inode bitmap, and
 513          * inode table have not been allocated (and in fact won't be
 514          * by this routine), they are accounted for nevertheless.
 515          *
 516          * If FLEX_BG meta-data grouping is used, only account for the
 517          * superblock and group descriptors (the inode tables and
 518          * bitmaps will be accounted for when allocated).
 519          */
 520         free_blocks = 0;
 521         csum_flag = ext2fs_has_group_desc_csum(fs);
 522         reserved_inos = super->s_first_ino;
 523         for (i = 0; i < fs->group_desc_count; i++) {
 524                 /*
 525                  * Don't set the BLOCK_UNINIT group for the last group
 526                  * because the block bitmap needs to be padded.
 527                  */
 528                 if (csum_flag) {
 529                         if (i != fs->group_desc_count - 1)
 530                                 ext2fs_bg_flags_set(fs, i,
 531                                                     EXT2_BG_BLOCK_UNINIT);
 532                         ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
 533                         numblocks = super->s_inodes_per_group;
 534                         if (reserved_inos) {
 535                                 if (numblocks > reserved_inos) {
 536                                         numblocks -= reserved_inos;
 537                                         reserved_inos = 0;
 538                                 } else {
 539                                         reserved_inos -= numblocks;
 540                                         numblocks = 0;
 541                                 }
 542                         }
 543                         ext2fs_bg_itable_unused_set(fs, i, numblocks);
 544                 }
 545                 numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
 546                 if (fs->super->s_log_groups_per_flex)
 547                         numblocks += 2 + fs->inode_blocks_per_group;
 548
 549                 free_blocks += numblocks;
 550                 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
 551                 ext2fs_bg_free_inodes_count_set(fs, i, fs->super->s_inodes_per_group);
 552                 ext2fs_bg_used_dirs_count_set(fs, i, 0);
 553                 ext2fs_group_desc_csum_set(fs, i);
 554         }
 555         free_blocks &= ~EXT2FS_CLUSTER_MASK(fs);
 556         ext2fs_free_blocks_count_set(super, free_blocks);
 557
 558         c = (char) 255;
 559         if (((int) c) == -1) {
 560                 super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
 561         } else {
 562                 super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
 563         }
 564
 565         ext2fs_mark_super_dirty(fs);
 566         ext2fs_mark_bb_dirty(fs);
 567         ext2fs_mark_ib_dirty(fs);
 568
 569         io_channel_set_blksize(fs->io, fs->blocksize);
 570
 571         *ret_fs = fs;
 572         return 0;
 573 cleanup:
 574         free(buf);
 575         ext2fs_free(fs);
 576         return retval;
 577 }