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