src/ext4_mkfs.c

   1 /*
   2  * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup lwext4
  30  * @{
  31  */
  32 /**
  33  * @file  ext4_mkfs.c
  34  * @brief
  35  */
  36
  37 #include "ext4_config.h"
  38 #include "ext4_types.h"
  39 #include "ext4_misc.h"
  40 #include "ext4_errno.h"
  41 #include "ext4_debug.h"
  42
  43 #include "ext4_super.h"
  44 #include "ext4_block_group.h"
  45 #include "ext4_dir.h"
  46 #include "ext4_dir_idx.h"
  47 #include "ext4_fs.h"
  48 #include "ext4_inode.h"
  49 #include "ext4_ialloc.h"
  50 #include "ext4_mkfs.h"
  51
  52 #include <inttypes.h>
  53 #include <string.h>
  54 #include <stdlib.h>
  55
  56 struct fs_aux_info {
  57         struct ext4_sblock *sb;
  58         struct ext4_bgroup *bg_desc;
  59         struct xattr_list_element *xattrs;
  60         uint32_t first_data_block;
  61         uint64_t len_blocks;
  62         uint32_t inode_table_blocks;
  63         uint32_t groups;
  64         uint32_t bg_desc_blocks;
  65         uint32_t default_i_flags;
  66         uint32_t blocks_per_ind;
  67         uint32_t blocks_per_dind;
  68         uint32_t blocks_per_tind;
  69 };
  70
  71 static inline int log_2(int j)
  72 {
  73         int i;
  74
  75         for (i = 0; j > 0; i++)
  76                 j >>= 1;
  77
  78         return i - 1;
  79 }
  80
  81 static int sb2info(struct ext4_sblock *sb, struct ext4_mkfs_info *info)
  82 {
  83         if (to_le16(sb->magic) != EXT4_SUPERBLOCK_MAGIC)
  84                 return EINVAL;
  85
  86         info->block_size = 1024 << to_le32(sb->log_block_size);
  87         info->blocks_per_group = to_le32(sb->blocks_per_group);
  88         info->inodes_per_group = to_le32(sb->inodes_per_group);
  89         info->inode_size = to_le16(sb->inode_size);
  90         info->inodes = to_le32(sb->inodes_count);
  91         info->feat_ro_compat = to_le32(sb->features_read_only);
  92         info->feat_compat = to_le32(sb->features_compatible);
  93         info->feat_incompat = to_le32(sb->features_incompatible);
  94         info->bg_desc_reserve_blocks = to_le16(sb->s_reserved_gdt_blocks);
  95         info->label = sb->volume_name;
  96         info->len = (uint64_t)info->block_size * ext4_sb_get_blocks_cnt(sb);
  97         info->dsc_size = to_le16(sb->desc_size);
  98
  99         return EOK;
 100 }
 101
 102 static uint32_t compute_blocks_per_group(struct ext4_mkfs_info *info)
 103 {
 104         return info->block_size * 8;
 105 }
 106
 107 static uint32_t compute_inodes(struct ext4_mkfs_info *info)
 108 {
 109         return (uint32_t)EXT4_DIV_ROUND_UP(info->len, info->block_size) / 4;
 110 }
 111
 112 static uint32_t compute_inodes_per_group(struct ext4_mkfs_info *info)
 113 {
 114         uint32_t blocks = (uint32_t)EXT4_DIV_ROUND_UP(info->len, info->block_size);
 115         uint32_t block_groups = EXT4_DIV_ROUND_UP(blocks, info->blocks_per_group);
 116         uint32_t inodes = EXT4_DIV_ROUND_UP(info->inodes, block_groups);
 117         inodes = EXT4_ALIGN(inodes, (info->block_size / info->inode_size));
 118
 119         /* After properly rounding up the number of inodes/group,
 120          * make sure to update the total inodes field in the info struct.
 121          */
 122         info->inodes = inodes * block_groups;
 123
 124         return inodes;
 125 }
 126
 127
 128 static uint32_t compute_journal_blocks(struct ext4_mkfs_info *info)
 129 {
 130         uint32_t journal_blocks = (uint32_t)EXT4_DIV_ROUND_UP(info->len,
 131                                                  info->block_size) / 64;
 132         if (journal_blocks < 1024)
 133                 journal_blocks = 1024;
 134         if (journal_blocks > 32768)
 135                 journal_blocks = 32768;
 136         return journal_blocks;
 137 }
 138
 139 static bool has_superblock(struct ext4_mkfs_info *info, uint32_t bgid)
 140 {
 141         if (!(info->feat_ro_compat & EXT4_FRO_COM_SPARSE_SUPER))
 142                 return true;
 143
 144         return ext4_sb_sparse(bgid);
 145 }
 146
 147 static int create_fs_aux_info(struct fs_aux_info *aux_info,
 148                               struct ext4_mkfs_info *info)
 149 {
 150         aux_info->first_data_block = (info->block_size > 1024) ? 0 : 1;
 151         aux_info->len_blocks = info->len / info->block_size;
 152         aux_info->inode_table_blocks = EXT4_DIV_ROUND_UP(info->inodes_per_group *
 153                         info->inode_size, info->block_size);
 154         aux_info->groups = (uint32_t)EXT4_DIV_ROUND_UP(aux_info->len_blocks -
 155                         aux_info->first_data_block, info->blocks_per_group);
 156         aux_info->blocks_per_ind = info->block_size / sizeof(uint32_t);
 157         aux_info->blocks_per_dind =
 158                         aux_info->blocks_per_ind * aux_info->blocks_per_ind;
 159         aux_info->blocks_per_tind =
 160                         aux_info->blocks_per_dind * aux_info->blocks_per_dind;
 161
 162         aux_info->bg_desc_blocks =
 163                 EXT4_DIV_ROUND_UP(aux_info->groups * info->dsc_size,
 164                         info->block_size);
 165
 166         aux_info->default_i_flags = EXT4_INODE_FLAG_NOATIME;
 167
 168         uint32_t last_group_size = aux_info->len_blocks % info->blocks_per_group;
 169         uint32_t last_header_size = 2 + aux_info->inode_table_blocks;
 170         if (has_superblock(info, aux_info->groups - 1))
 171                 last_header_size += 1 + aux_info->bg_desc_blocks +
 172                         info->bg_desc_reserve_blocks;
 173
 174         if (last_group_size > 0 && last_group_size < last_header_size) {
 175                 aux_info->groups--;
 176                 aux_info->len_blocks -= last_group_size;
 177         }
 178
 179         aux_info->sb = calloc(1, EXT4_SUPERBLOCK_SIZE);
 180         if (!aux_info->sb)
 181                 return ENOMEM;
 182
 183         aux_info->bg_desc = calloc(1, sizeof(struct ext4_bgroup));
 184         if (!aux_info->bg_desc)
 185                 return ENOMEM;
 186
 187         aux_info->xattrs = NULL;
 188
 189
 190         ext4_dbg(DEBUG_MKFS, DBG_INFO "create_fs_aux_info\n");
 191         ext4_dbg(DEBUG_MKFS, DBG_NONE "first_data_block: %"PRIu32"\n",
 192                         aux_info->first_data_block);
 193         ext4_dbg(DEBUG_MKFS, DBG_NONE "len_blocks: %"PRIu64"\n",
 194                         aux_info->len_blocks);
 195         ext4_dbg(DEBUG_MKFS, DBG_NONE "inode_table_blocks: %"PRIu32"\n",
 196                         aux_info->inode_table_blocks);
 197         ext4_dbg(DEBUG_MKFS, DBG_NONE "groups: %"PRIu32"\n",
 198                         aux_info->groups);
 199         ext4_dbg(DEBUG_MKFS, DBG_NONE "bg_desc_blocks: %"PRIu32"\n",
 200                         aux_info->bg_desc_blocks);
 201         ext4_dbg(DEBUG_MKFS, DBG_NONE "default_i_flags: %"PRIu32"\n",
 202                         aux_info->default_i_flags);
 203         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_ind: %"PRIu32"\n",
 204                         aux_info->blocks_per_ind);
 205         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_dind: %"PRIu32"\n",
 206                         aux_info->blocks_per_dind);
 207         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_tind: %"PRIu32"\n",
 208                         aux_info->blocks_per_tind);
 209
 210         return EOK;
 211 }
 212
 213 static void release_fs_aux_info(struct fs_aux_info *aux_info)
 214 {
 215         if (aux_info->sb)
 216                 free(aux_info->sb);
 217         if (aux_info->bg_desc)
 218                 free(aux_info->bg_desc);
 219 }
 220
 221
 222 /* Fill in the superblock memory buffer based on the filesystem parameters */
 223 static void fill_in_sb(struct fs_aux_info *aux_info, struct ext4_mkfs_info *info)
 224 {
 225         struct ext4_sblock *sb = aux_info->sb;
 226
 227         sb->inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 228
 229         ext4_sb_set_blocks_cnt(sb, aux_info->len_blocks);
 230         ext4_sb_set_free_blocks_cnt(sb, aux_info->len_blocks);
 231         sb->free_inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 232
 233         sb->reserved_blocks_count_lo = to_le32(0);
 234         sb->first_data_block = to_le32(aux_info->first_data_block);
 235         sb->log_block_size = to_le32(log_2(info->block_size / 1024));
 236         sb->log_cluster_size = to_le32(log_2(info->block_size / 1024));
 237         sb->blocks_per_group = to_le32(info->blocks_per_group);
 238         sb->frags_per_group = to_le32(info->blocks_per_group);
 239         sb->inodes_per_group = to_le32(info->inodes_per_group);
 240         sb->mount_time = to_le32(0);
 241         sb->write_time = to_le32(0);
 242         sb->mount_count = to_le16(0);
 243         sb->max_mount_count = to_le16(0xFFFF);
 244         sb->magic = to_le16(EXT4_SUPERBLOCK_MAGIC);
 245         sb->state = to_le16(EXT4_SUPERBLOCK_STATE_VALID_FS);
 246         sb->errors = to_le16(EXT4_SUPERBLOCK_ERRORS_RO);
 247         sb->minor_rev_level = to_le16(0);
 248         sb->last_check_time = to_le32(0);
 249         sb->check_interval = to_le32(0);
 250         sb->creator_os = to_le32(EXT4_SUPERBLOCK_OS_LINUX);
 251         sb->rev_level = to_le32(1);
 252         sb->def_resuid = to_le16(0);
 253         sb->def_resgid = to_le16(0);
 254
 255         sb->first_inode = to_le32(EXT4_GOOD_OLD_FIRST_INO);
 256         sb->inode_size = to_le16(info->inode_size);
 257         sb->block_group_index = to_le16(0);
 258
 259         sb->features_compatible = to_le32(info->feat_compat);
 260         sb->features_incompatible = to_le32(info->feat_incompat);
 261         sb->features_read_only = to_le32(info->feat_ro_compat);
 262
 263         memset(sb->uuid, 0, sizeof(sb->uuid));
 264
 265         memset(sb->volume_name, 0, sizeof(sb->volume_name));
 266         strncpy(sb->volume_name, info->label, sizeof(sb->volume_name));
 267         memset(sb->last_mounted, 0, sizeof(sb->last_mounted));
 268
 269         sb->algorithm_usage_bitmap = to_le32(0);
 270         sb->s_prealloc_blocks = 0;
 271         sb->s_prealloc_dir_blocks = 0;
 272         sb->s_reserved_gdt_blocks = to_le16(info->bg_desc_reserve_blocks);
 273
 274         if (info->feat_compat & EXT4_FCOM_HAS_JOURNAL)
 275                 sb->journal_inode_number = to_le32(EXT4_JOURNAL_INO);
 276         sb->journal_dev = to_le32(0);
 277         sb->last_orphan = to_le32(0);
 278         sb->hash_seed[0] = to_le32(0x11111111);
 279         sb->hash_seed[1] = to_le32(0x22222222);
 280         sb->hash_seed[2] = to_le32(0x33333333);
 281         sb->hash_seed[3] = to_le32(0x44444444);
 282         sb->default_hash_version = EXT2_HTREE_HALF_MD4;
 283         sb->checksum_type = 1;
 284         sb->desc_size = to_le16(info->dsc_size);
 285         sb->default_mount_opts = to_le32(0);
 286         sb->first_meta_bg = to_le32(0);
 287         sb->mkfs_time = to_le32(0);
 288
 289         sb->reserved_blocks_count_hi = to_le32(0);
 290         sb->min_extra_isize = to_le32(sizeof(struct ext4_inode) -
 291                 EXT4_GOOD_OLD_INODE_SIZE);
 292         sb->want_extra_isize = to_le32(sizeof(struct ext4_inode) -
 293                 EXT4_GOOD_OLD_INODE_SIZE);
 294         sb->flags = to_le32(EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH);
 295 }
 296
 297
 298
 299 static int write_bgroups(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 300                          struct ext4_mkfs_info *info)
 301 {
 302         int r = EOK;
 303         uint32_t i, j;
 304         uint32_t bg_free_blk = 0;
 305         uint64_t sb_free_blk = 0;
 306         struct ext4_block b;
 307
 308         uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 309
 310         for (i = 0; i < aux_info->groups; i++) {
 311                 uint64_t bg_start_block = aux_info->first_data_block +
 312                         aux_info->first_data_block + i * info->blocks_per_group;
 313                 uint32_t blk_off = 0;
 314
 315                 bg_free_blk = info->blocks_per_group -
 316                                 aux_info->inode_table_blocks;
 317
 318                 bg_free_blk -= 2;
 319                 blk_off += aux_info->bg_desc_blocks;
 320
 321                 if (i == (aux_info->groups - 1))
 322                         bg_free_blk -= aux_info->first_data_block;
 323
 324                 if (has_superblock(info, i)) {
 325                         bg_start_block++;
 326                         blk_off += info->bg_desc_reserve_blocks;
 327                         bg_free_blk -= info->bg_desc_reserve_blocks + 1;
 328                         bg_free_blk -= aux_info->bg_desc_blocks;
 329                 }
 330
 331                 ext4_bg_set_block_bitmap(aux_info->bg_desc, aux_info->sb,
 332                                 bg_start_block + blk_off + 1);
 333
 334                 ext4_bg_set_inode_bitmap(aux_info->bg_desc, aux_info->sb,
 335                                 bg_start_block + blk_off + 2);
 336
 337                 ext4_bg_set_inode_table_first_block(aux_info->bg_desc,
 338                                 aux_info->sb,
 339                                 bg_start_block + blk_off + 3);
 340
 341                 ext4_bg_set_free_blocks_count(aux_info->bg_desc,
 342                                 aux_info->sb, bg_free_blk);
 343
 344                 ext4_bg_set_free_inodes_count(aux_info->bg_desc,
 345                                 aux_info->sb, aux_info->sb->inodes_per_group);
 346
 347                 ext4_bg_set_used_dirs_count(aux_info->bg_desc, aux_info->sb,
 348                                             0);
 349
 350                 ext4_bg_set_flag(aux_info->bg_desc,
 351                                 EXT4_BLOCK_GROUP_BLOCK_UNINIT |
 352                                 EXT4_BLOCK_GROUP_INODE_UNINIT);
 353
 354                 sb_free_blk += bg_free_blk;
 355
 356
 357                 for (j = 0; j < aux_info->groups; j++) {
 358                         uint64_t bg_start_block = aux_info->first_data_block +
 359                                                   j * info->blocks_per_group;
 360                         uint32_t blk_off = 0;
 361
 362                         blk_off += aux_info->bg_desc_blocks;
 363                         if (has_superblock(info, j)) {
 364                                 bg_start_block++;
 365                                 blk_off += info->bg_desc_reserve_blocks;
 366                         }
 367
 368
 369                         uint32_t dsc_pos = 0;
 370                         uint32_t dsc_size = ext4_sb_get_desc_size(aux_info->sb);
 371                         uint64_t dsc_blk = bg_start_block +
 372                                            i * dsc_size / block_size;
 373
 374                         r = ext4_block_get(bd, &b, dsc_blk);
 375                         if (r != EOK)
 376                                 return r;
 377
 378                         dsc_pos = (i * dsc_size) % block_size;
 379                         memcpy(b.data + dsc_pos,
 380                                         aux_info->bg_desc,
 381                                         dsc_size);
 382
 383
 384                         ext4_bcache_set_dirty(b.buf);
 385                         r = ext4_block_set(bd, &b);
 386                         if (r != EOK)
 387                                 return r;
 388                 }
 389
 390                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 1);
 391                 if (r != EOK)
 392                         return r;
 393                 memset(b.data, 0, block_size);
 394                 ext4_bcache_set_dirty(b.buf);
 395                 r = ext4_block_set(bd, &b);
 396                 if (r != EOK)
 397                         return r;
 398                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 2);
 399                 if (r != EOK)
 400                         return r;
 401                 memset(b.data, 0, block_size);
 402                 ext4_bcache_set_dirty(b.buf);
 403                 r = ext4_block_set(bd, &b);
 404                 if (r != EOK)
 405                         return r;
 406         }
 407
 408         ext4_sb_set_free_blocks_cnt(aux_info->sb, sb_free_blk);
 409         return r;
 410 }
 411
 412 static int write_sblocks(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 413                           struct ext4_mkfs_info *info)
 414 {
 415         uint64_t offset;
 416         uint32_t i;
 417         int r;
 418
 419         /* write out the backup superblocks */
 420         for (i = 1; i < aux_info->groups; i++) {
 421                 if (has_superblock(info, i)) {
 422                         offset = info->block_size * (aux_info->first_data_block
 423                                 + i * info->blocks_per_group);
 424
 425                         aux_info->sb->block_group_index = to_le16(i);
 426                         r = ext4_block_writebytes(bd, offset, aux_info->sb,
 427                                                   EXT4_SUPERBLOCK_SIZE);
 428                         if (r != EOK)
 429                                 return r;
 430                 }
 431         }
 432
 433         /* write out the primary superblock */
 434         aux_info->sb->block_group_index = to_le16(0);
 435         return ext4_block_writebytes(bd, 1024, aux_info->sb,
 436                         EXT4_SUPERBLOCK_SIZE);
 437 }
 438
 439
 440 int ext4_mkfs_read_info(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 441 {
 442         int r;
 443         struct ext4_sblock *sb = NULL;
 444         r = ext4_block_init(bd);
 445         if (r != EOK)
 446                 return r;
 447
 448         sb = malloc(EXT4_SUPERBLOCK_SIZE);
 449         if (!sb)
 450                 goto Finish;
 451
 452
 453         r = ext4_sb_read(bd, sb);
 454         if (r != EOK)
 455                 goto Finish;
 456
 457         r = sb2info(sb, info);
 458
 459 Finish:
 460         if (sb)
 461                 free(sb);
 462         ext4_block_fini(bd);
 463         return r;
 464 }
 465
 466 static int mkfs_initial(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 467 {
 468         int r;
 469         struct fs_aux_info aux_info;
 470         memset(&aux_info, 0, sizeof(struct fs_aux_info));
 471
 472         r = create_fs_aux_info(&aux_info, info);
 473         if (r != EOK)
 474                 goto Finish;
 475
 476         fill_in_sb(&aux_info, info);
 477
 478         r = write_bgroups(bd, &aux_info, info);
 479         if (r != EOK)
 480                 goto Finish;
 481
 482         r = write_sblocks(bd, &aux_info, info);
 483         if (r != EOK)
 484                 goto Finish;
 485
 486         Finish:
 487         release_fs_aux_info(&aux_info);
 488         return r;
 489 }
 490
 491 static int init_bgs(struct ext4_fs *fs)
 492 {
 493         int r = EOK;
 494         struct ext4_block_group_ref ref;
 495         uint32_t i;
 496         uint32_t bg_count = ext4_block_group_cnt(&fs->sb);
 497         for (i = 0; i < bg_count; ++i) {
 498                 r = ext4_fs_get_block_group_ref(fs, i, &ref);
 499                 if (r != EOK)
 500                         break;
 501
 502                 r = ext4_fs_put_block_group_ref(&ref);
 503                 if (r != EOK)
 504                         break;
 505         }
 506         return r;
 507 }
 508
 509 static int alloc_inodes(struct ext4_fs *fs)
 510 {
 511         int r = EOK;
 512         int i;
 513         struct ext4_inode_ref inode_ref;
 514         for (i = 1; i < 12; ++i) {
 515                 int filetype = EXT4_DE_REG_FILE;
 516
 517                 switch (i) {
 518                 case EXT4_ROOT_INO:
 519                 case EXT4_GOOD_OLD_FIRST_INO:
 520                         filetype = EXT4_DE_DIR;
 521                         break;
 522                 }
 523
 524                 r = ext4_fs_alloc_inode(fs, &inode_ref, filetype);
 525                 if (r != EOK)
 526                         return r;
 527
 528                 ext4_inode_set_mode(&fs->sb, inode_ref.inode, 0);
 529                 ext4_fs_put_inode_ref(&inode_ref);
 530         }
 531
 532         return r;
 533 }
 534
 535 static int create_dirs(struct ext4_fs *fs)
 536 {
 537         int r = EOK;
 538         struct ext4_inode_ref root;
 539         struct ext4_inode_ref child;
 540
 541         r = ext4_fs_get_inode_ref(fs, EXT4_ROOT_INO, &root);
 542         if (r != EOK)
 543                 return r;
 544
 545         r = ext4_fs_get_inode_ref(fs, EXT4_GOOD_OLD_FIRST_INO, &child);
 546         if (r != EOK)
 547                 return r;
 548
 549         ext4_inode_set_mode(&fs->sb, child.inode,
 550                         EXT4_INODE_MODE_DIRECTORY | 0777);
 551
 552         ext4_inode_set_mode(&fs->sb, root.inode,
 553                         EXT4_INODE_MODE_DIRECTORY | 0777);
 554
 555 #if CONFIG_DIR_INDEX_ENABLE
 556         /* Initialize directory index if supported */
 557         if (ext4_sb_feature_com(&fs->sb, EXT4_FCOM_DIR_INDEX)) {
 558                 r = ext4_dir_dx_init(&root, &root);
 559                 if (r != EOK)
 560                         return r;
 561
 562                 r = ext4_dir_dx_init(&child, &root);
 563                 if (r != EOK)
 564                         return r;
 565
 566                 ext4_inode_set_flag(root.inode, EXT4_INODE_FLAG_INDEX);
 567                 ext4_inode_set_flag(child.inode, EXT4_INODE_FLAG_INDEX);
 568         } else
 569 #endif
 570         {
 571                 r = ext4_dir_add_entry(&root, ".", strlen("."), &root);
 572                 if (r != EOK)
 573                         return r;
 574
 575                 r = ext4_dir_add_entry(&root, "..", strlen(".."), &root);
 576                 if (r != EOK)
 577                         return r;
 578
 579                 r = ext4_dir_add_entry(&child, ".", strlen("."), &child);
 580                 if (r != EOK)
 581                         return r;
 582
 583                 r = ext4_dir_add_entry(&child, "..", strlen(".."), &root);
 584                 if (r != EOK)
 585                         return r;
 586         }
 587
 588         r = ext4_dir_add_entry(&root, "lost+found", strlen("lost+found"), &child);
 589         if (r != EOK)
 590                 return r;
 591
 592         ext4_inode_set_links_cnt(root.inode, 3);
 593         ext4_inode_set_links_cnt(child.inode, 2);
 594
 595         child.dirty = true;
 596         root.dirty = true;
 597         ext4_fs_put_inode_ref(&child);
 598         ext4_fs_put_inode_ref(&root);
 599         return r;
 600 }
 601
 602 int ext4_mkfs(struct ext4_fs *fs, struct ext4_blockdev *bd,
 603               struct ext4_mkfs_info *info, int fs_type)
 604 {
 605         int r;
 606
 607         r = ext4_block_init(bd);
 608         if (r != EOK)
 609                 return r;
 610
 611         bd->fs = fs;
 612
 613         if (info->len == 0)
 614                 info->len = bd->bdif->ph_bcnt * bd->bdif->ph_bsize;
 615
 616         if (info->block_size == 0)
 617                 info->block_size = 4096; /*Set block size to default value*/
 618
 619         /* Round down the filesystem length to be a multiple of the block size */
 620         info->len &= ~((uint64_t)info->block_size - 1);
 621
 622         if (info->journal_blocks == 0)
 623                 info->journal_blocks = compute_journal_blocks(info);
 624
 625         if (info->blocks_per_group == 0)
 626                 info->blocks_per_group = compute_blocks_per_group(info);
 627
 628         if (info->inodes == 0)
 629                 info->inodes = compute_inodes(info);
 630
 631         if (info->inode_size == 0)
 632                 info->inode_size = 256;
 633
 634         if (info->label == NULL)
 635                 info->label = "";
 636
 637         info->inodes_per_group = compute_inodes_per_group(info);
 638
 639         switch (fs_type) {
 640         case F_SET_EXT2:
 641                 info->feat_compat = EXT2_SUPPORTED_FCOM;
 642                 info->feat_ro_compat = EXT2_SUPPORTED_FRO_COM;
 643                 info->feat_incompat = EXT2_SUPPORTED_FINCOM;
 644                 break;
 645         case F_SET_EXT3:
 646                 info->feat_compat = EXT3_SUPPORTED_FCOM;
 647                 info->feat_ro_compat = EXT3_SUPPORTED_FRO_COM;
 648                 info->feat_incompat = EXT3_SUPPORTED_FINCOM;
 649                 break;
 650         case F_SET_EXT4:
 651                 info->feat_compat = EXT4_SUPPORTED_FCOM;
 652                 info->feat_ro_compat = EXT4_SUPPORTED_FRO_COM;
 653                 info->feat_incompat = EXT4_SUPPORTED_FINCOM;
 654                 break;
 655         }
 656
 657         /*TODO: handle this features*/
 658         info->feat_incompat &= ~EXT4_FINCOM_META_BG;
 659         info->feat_incompat &= ~EXT4_FINCOM_FLEX_BG;
 660         info->feat_ro_compat &= ~EXT4_FRO_COM_METADATA_CSUM;
 661
 662         /*TODO: handle journal feature & inode*/
 663         if (info->journal == 0)
 664                 info->feat_compat |= 0;
 665
 666         if (info->dsc_size == 0) {
 667
 668                 if (info->feat_incompat & EXT4_FINCOM_64BIT)
 669                         info->dsc_size = EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE;
 670                 else
 671                         info->dsc_size = EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE;
 672         }
 673
 674         info->bg_desc_reserve_blocks = 0;
 675
 676         ext4_dbg(DEBUG_MKFS, DBG_INFO "Creating filesystem with parameters:\n");
 677         ext4_dbg(DEBUG_MKFS, DBG_NONE "Size: %"PRIu64"\n", info->len);
 678         ext4_dbg(DEBUG_MKFS, DBG_NONE "Block size: %"PRIu32"\n",
 679                         info->block_size);
 680         ext4_dbg(DEBUG_MKFS, DBG_NONE "Blocks per group: %"PRIu32"\n",
 681                         info->blocks_per_group);
 682         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes per group: %"PRIu32"\n",
 683                         info->inodes_per_group);
 684         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inode size: %"PRIu32"\n",
 685                         info->inode_size);
 686         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes: %"PRIu32"\n", info->inodes);
 687         ext4_dbg(DEBUG_MKFS, DBG_NONE "Journal blocks: %"PRIu32"\n",
 688                         info->journal_blocks);
 689         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features ro_compat: 0x%x\n",
 690                         info->feat_ro_compat);
 691         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features compat: 0x%x\n",
 692                         info->feat_compat);
 693         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features incompat: 0x%x\n",
 694                         info->feat_incompat);
 695         ext4_dbg(DEBUG_MKFS, DBG_NONE "BG desc reserve: %"PRIu32"\n",
 696                         info->bg_desc_reserve_blocks);
 697         ext4_dbg(DEBUG_MKFS, DBG_NONE "Descriptor size: %"PRIu16"\n",
 698                         info->dsc_size);
 699         ext4_dbg(DEBUG_MKFS, DBG_NONE "journal: %s\n",
 700                         info->journal ? "yes" : "no");
 701         ext4_dbg(DEBUG_MKFS, DBG_NONE "Label: %s\n", info->label);
 702
 703         struct ext4_bcache bc;
 704         memset(&bc, 0, sizeof(struct ext4_bcache));
 705         ext4_block_set_lb_size(bd, info->block_size);
 706         r = ext4_bcache_init_dynamic(&bc, CONFIG_BLOCK_DEV_CACHE_SIZE,
 707                                       info->block_size);
 708         if (r != EOK)
 709                 goto block_fini;
 710
 711         /*Bind block cache to block device*/
 712         r = ext4_block_bind_bcache(bd, &bc);
 713         if (r != EOK)
 714                 goto cache_fini;
 715
 716         r = ext4_block_cache_write_back(bd, 1);
 717         if (r != EOK)
 718                 goto cache_fini;
 719
 720         r = mkfs_initial(bd, info);
 721         if (r != EOK)
 722                 goto cache_fini;
 723
 724         r = ext4_fs_init(fs, bd, false);
 725         if (r != EOK)
 726                 goto cache_fini;
 727
 728         r = init_bgs(fs);
 729         if (r != EOK)
 730                 goto fs_fini;
 731
 732         r = alloc_inodes(fs);
 733         if (r != EOK)
 734                 goto fs_fini;
 735
 736         r = create_dirs(fs);
 737         if (r != EOK)
 738                 goto fs_fini;
 739
 740         fs_fini:
 741         ext4_fs_fini(fs);
 742
 743         cache_fini:
 744         ext4_block_cache_write_back(bd, 0);
 745         ext4_bcache_fini_dynamic(&bc);
 746
 747         block_fini:
 748         ext4_block_fini(bd);
 749
 750         return r;
 751 }
 752
 753 /**
 754  * @}
 755  */