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(aux_info->groups, 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 static void fill_bgroups(struct fs_aux_info *aux_info,
 298                          struct ext4_mkfs_info *info)
 299 {
 300         uint32_t i;
 301
 302         uint32_t bg_free_blk = 0;
 303         uint64_t sb_free_blk = 0;
 304
 305         for (i = 0; i < aux_info->groups; i++) {
 306
 307                 uint64_t bg_start_block = aux_info->first_data_block +
 308                         aux_info->first_data_block + i * info->blocks_per_group;
 309                 uint32_t blk_off = 0;
 310
 311                 bg_free_blk = info->blocks_per_group -
 312                                 aux_info->inode_table_blocks;
 313
 314                 bg_free_blk -= 2;
 315                 blk_off += aux_info->bg_desc_blocks;
 316
 317                 if (i == (aux_info->groups - 1))
 318                         bg_free_blk -= aux_info->first_data_block;
 319
 320                 if (has_superblock(info, i)) {
 321                         bg_start_block++;
 322                         blk_off += info->bg_desc_reserve_blocks;
 323                         bg_free_blk -= info->bg_desc_reserve_blocks + 1;
 324                         bg_free_blk -= aux_info->bg_desc_blocks;
 325                 }
 326
 327                 ext4_bg_set_block_bitmap(&aux_info->bg_desc[i], aux_info->sb,
 328                                 bg_start_block + blk_off + 1);
 329
 330                 ext4_bg_set_inode_bitmap(&aux_info->bg_desc[i], aux_info->sb,
 331                                 bg_start_block + blk_off + 2);
 332
 333                 ext4_bg_set_inode_table_first_block(&aux_info->bg_desc[i],
 334                                 aux_info->sb,
 335                                 bg_start_block + blk_off + 3);
 336
 337                 ext4_bg_set_free_blocks_count(&aux_info->bg_desc[i],
 338                                 aux_info->sb, bg_free_blk);
 339
 340                 ext4_bg_set_free_inodes_count(&aux_info->bg_desc[i],
 341                                 aux_info->sb, aux_info->sb->inodes_per_group);
 342
 343                 ext4_bg_set_used_dirs_count(&aux_info->bg_desc[i], aux_info->sb,
 344                                             0);
 345
 346                 ext4_bg_set_flag(&aux_info->bg_desc[i],
 347                                 EXT4_BLOCK_GROUP_BLOCK_UNINIT |
 348                                 EXT4_BLOCK_GROUP_INODE_UNINIT);
 349
 350                 sb_free_blk += bg_free_blk;
 351         }
 352
 353         ext4_sb_set_free_blocks_cnt(aux_info->sb, sb_free_blk);
 354 }
 355
 356
 357 static int write_bgroups(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 358                          struct ext4_mkfs_info *info)
 359 {
 360         int r = EOK;
 361         uint32_t i;
 362         struct ext4_block b;
 363         for (i = 0; i < aux_info->groups; i++) {
 364                 uint64_t bg_start_block = aux_info->first_data_block +
 365                         + i * info->blocks_per_group;
 366                 uint32_t blk_off = 0;
 367
 368                 blk_off += aux_info->bg_desc_blocks;
 369                 if (has_superblock(info, i)) {
 370                         bg_start_block++;
 371                         blk_off += info->bg_desc_reserve_blocks;
 372                 }
 373
 374                 uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 375                 uint32_t dsc_pos = 0;
 376                 uint32_t dsc_id = 0;
 377                 uint32_t dsc_size = ext4_sb_get_desc_size(aux_info->sb);
 378                 uint32_t dsc_blk_cnt = aux_info->bg_desc_blocks;
 379                 uint64_t dsc_blk = bg_start_block;
 380
 381                 while (dsc_blk_cnt--) {
 382                         r = ext4_block_get(bd, &b, dsc_blk++);
 383                         if (r != EOK)
 384                                 return r;
 385
 386                         dsc_pos = 0;
 387                         while (dsc_pos + dsc_size <= block_size) {
 388                                 memcpy(b.data + dsc_pos,
 389                                        &aux_info->bg_desc[dsc_id],
 390                                        dsc_size);
 391
 392                                 dsc_pos += dsc_size;
 393                                 dsc_id++;
 394
 395                                 if (dsc_id == aux_info->groups)
 396                                         break;
 397                         }
 398
 399                         ext4_bcache_set_dirty(b.buf);
 400                         r = ext4_block_set(bd, &b);
 401                         if (r != EOK)
 402                                 return r;
 403
 404                         if (dsc_id == aux_info->groups)
 405                                 break;
 406                 }
 407
 408                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 1);
 409                 if (r != EOK)
 410                         return r;
 411                 memset(b.data, 0, block_size);
 412                 ext4_bcache_set_dirty(b.buf);
 413                 r = ext4_block_set(bd, &b);
 414                 if (r != EOK)
 415                         return r;
 416                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 2);
 417                 if (r != EOK)
 418                         return r;
 419                 memset(b.data, 0, block_size);
 420                 ext4_bcache_set_dirty(b.buf);
 421                 r = ext4_block_set(bd, &b);
 422                 if (r != EOK)
 423                         return r;
 424         }
 425
 426
 427         return r;
 428 }
 429
 430 static int write_sblocks(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 431                           struct ext4_mkfs_info *info)
 432 {
 433         uint64_t offset;
 434         uint32_t i;
 435         int r;
 436
 437         /* write out the backup superblocks */
 438         for (i = 1; i < aux_info->groups; i++) {
 439                 if (has_superblock(info, i)) {
 440                         offset = info->block_size * (aux_info->first_data_block
 441                                 + i * info->blocks_per_group);
 442
 443                         aux_info->sb->block_group_index = to_le16(i);
 444                         r = ext4_block_writebytes(bd, offset, aux_info->sb,
 445                                                   EXT4_SUPERBLOCK_SIZE);
 446                         if (r != EOK)
 447                                 return r;
 448                 }
 449         }
 450
 451         /* write out the primary superblock */
 452         aux_info->sb->block_group_index = to_le16(0);
 453         return ext4_block_writebytes(bd, 1024, aux_info->sb,
 454                         EXT4_SUPERBLOCK_SIZE);
 455 }
 456
 457
 458 int ext4_mkfs_read_info(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 459 {
 460         int r;
 461         struct ext4_sblock *sb = NULL;
 462         r = ext4_block_init(bd);
 463         if (r != EOK)
 464                 return r;
 465
 466         sb = malloc(EXT4_SUPERBLOCK_SIZE);
 467         if (!sb)
 468                 goto Finish;
 469
 470
 471         r = ext4_sb_read(bd, sb);
 472         if (r != EOK)
 473                 goto Finish;
 474
 475         r = sb2info(sb, info);
 476
 477 Finish:
 478         if (sb)
 479                 free(sb);
 480         ext4_block_fini(bd);
 481         return r;
 482 }
 483
 484 static int mkfs_initial(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 485 {
 486         int r;
 487         struct fs_aux_info aux_info;
 488         memset(&aux_info, 0, sizeof(struct fs_aux_info));
 489
 490         r = create_fs_aux_info(&aux_info, info);
 491         if (r != EOK)
 492                 goto Finish;
 493
 494         fill_in_sb(&aux_info, info);
 495         fill_bgroups(&aux_info, info);
 496
 497
 498         r = write_bgroups(bd, &aux_info, info);
 499         if (r != EOK)
 500                 goto Finish;
 501
 502         r = write_sblocks(bd, &aux_info, info);
 503         if (r != EOK)
 504                 goto Finish;
 505
 506         Finish:
 507         release_fs_aux_info(&aux_info);
 508         return r;
 509 }
 510
 511 static int init_bgs(struct ext4_fs *fs)
 512 {
 513         int r = EOK;
 514         struct ext4_block_group_ref ref;
 515         uint32_t i;
 516         uint32_t bg_count = ext4_block_group_cnt(&fs->sb);
 517         for (i = 0; i < bg_count; ++i) {
 518                 r = ext4_fs_get_block_group_ref(fs, i, &ref);
 519                 if (r != EOK)
 520                         break;
 521
 522                 r = ext4_fs_put_block_group_ref(&ref);
 523                 if (r != EOK)
 524                         break;
 525         }
 526         return r;
 527 }
 528
 529 static int alloc_inodes(struct ext4_fs *fs)
 530 {
 531         int r = EOK;
 532         int i;
 533         struct ext4_inode_ref inode_ref;
 534         for (i = 1; i < 12; ++i) {
 535                 int filetype = EXT4_DE_REG_FILE;
 536
 537                 switch (i) {
 538                 case EXT4_ROOT_INO:
 539                 case EXT4_GOOD_OLD_FIRST_INO:
 540                         filetype = EXT4_DE_DIR;
 541                         break;
 542                 }
 543
 544                 r = ext4_fs_alloc_inode(fs, &inode_ref, filetype);
 545                 if (r != EOK)
 546                         return r;
 547
 548                 ext4_inode_set_mode(&fs->sb, inode_ref.inode, 0);
 549                 ext4_fs_put_inode_ref(&inode_ref);
 550         }
 551
 552         return r;
 553 }
 554
 555 static int create_dirs(struct ext4_fs *fs)
 556 {
 557         int r = EOK;
 558         struct ext4_inode_ref root;
 559         struct ext4_inode_ref child;
 560
 561         r = ext4_fs_get_inode_ref(fs, EXT4_ROOT_INO, &root);
 562         if (r != EOK)
 563                 return r;
 564
 565         r = ext4_fs_get_inode_ref(fs, EXT4_GOOD_OLD_FIRST_INO, &child);
 566         if (r != EOK)
 567                 return r;
 568
 569         ext4_inode_set_mode(&fs->sb, child.inode,
 570                         EXT4_INODE_MODE_DIRECTORY | 0777);
 571
 572         ext4_inode_set_mode(&fs->sb, root.inode,
 573                         EXT4_INODE_MODE_DIRECTORY | 0777);
 574
 575 #if CONFIG_DIR_INDEX_ENABLE
 576         /* Initialize directory index if supported */
 577         if (ext4_sb_feature_com(&fs->sb, EXT4_FCOM_DIR_INDEX)) {
 578                 r = ext4_dir_dx_init(&root, &root);
 579                 if (r != EOK)
 580                         return r;
 581
 582                 r = ext4_dir_dx_init(&child, &root);
 583                 if (r != EOK)
 584                         return r;
 585
 586                 ext4_inode_set_flag(root.inode, EXT4_INODE_FLAG_INDEX);
 587                 ext4_inode_set_flag(child.inode, EXT4_INODE_FLAG_INDEX);
 588         } else
 589 #endif
 590         {
 591                 r = ext4_dir_add_entry(&root, ".", strlen("."), &root);
 592                 if (r != EOK)
 593                         return r;
 594
 595                 r = ext4_dir_add_entry(&root, "..", strlen(".."), &root);
 596                 if (r != EOK)
 597                         return r;
 598
 599                 r = ext4_dir_add_entry(&child, ".", strlen("."), &child);
 600                 if (r != EOK)
 601                         return r;
 602
 603                 r = ext4_dir_add_entry(&child, "..", strlen(".."), &root);
 604                 if (r != EOK)
 605                         return r;
 606         }
 607
 608         r = ext4_dir_add_entry(&root, "lost+found", strlen("lost+found"), &child);
 609         if (r != EOK)
 610                 return r;
 611
 612         ext4_inode_set_links_cnt(root.inode, 3);
 613         ext4_inode_set_links_cnt(child.inode, 2);
 614
 615         child.dirty = true;
 616         root.dirty = true;
 617         ext4_fs_put_inode_ref(&child);
 618         ext4_fs_put_inode_ref(&root);
 619         return r;
 620 }
 621
 622 int ext4_mkfs(struct ext4_fs *fs, struct ext4_blockdev *bd,
 623               struct ext4_mkfs_info *info, int fs_type)
 624 {
 625         int r;
 626
 627         r = ext4_block_init(bd);
 628         if (r != EOK)
 629                 return r;
 630
 631         bd->fs = fs;
 632
 633         if (info->len == 0)
 634                 info->len = bd->bdif->ph_bcnt * bd->bdif->ph_bsize;
 635
 636         if (info->block_size == 0)
 637                 info->block_size = 4096; /*Set block size to default value*/
 638
 639         /* Round down the filesystem length to be a multiple of the block size */
 640         info->len &= ~((uint64_t)info->block_size - 1);
 641
 642         if (info->journal_blocks == 0)
 643                 info->journal_blocks = compute_journal_blocks(info);
 644
 645         if (info->blocks_per_group == 0)
 646                 info->blocks_per_group = compute_blocks_per_group(info);
 647
 648         if (info->inodes == 0)
 649                 info->inodes = compute_inodes(info);
 650
 651         if (info->inode_size == 0)
 652                 info->inode_size = 256;
 653
 654         if (info->label == NULL)
 655                 info->label = "";
 656
 657         info->inodes_per_group = compute_inodes_per_group(info);
 658
 659         switch (fs_type) {
 660         case F_SET_EXT2:
 661                 info->feat_compat = EXT2_SUPPORTED_FCOM;
 662                 info->feat_ro_compat = EXT2_SUPPORTED_FRO_COM;
 663                 info->feat_incompat = EXT2_SUPPORTED_FINCOM;
 664                 break;
 665         case F_SET_EXT3:
 666                 info->feat_compat = EXT3_SUPPORTED_FCOM;
 667                 info->feat_ro_compat = EXT3_SUPPORTED_FRO_COM;
 668                 info->feat_incompat = EXT3_SUPPORTED_FINCOM;
 669                 break;
 670         case F_SET_EXT4:
 671                 info->feat_compat = EXT4_SUPPORTED_FCOM;
 672                 info->feat_ro_compat = EXT4_SUPPORTED_FRO_COM;
 673                 info->feat_incompat = EXT4_SUPPORTED_FINCOM;
 674                 break;
 675         }
 676
 677         /*TODO: handle this features*/
 678         info->feat_incompat &= ~EXT4_FINCOM_META_BG;
 679         info->feat_incompat &= ~EXT4_FINCOM_FLEX_BG;
 680         info->feat_ro_compat &= ~EXT4_FRO_COM_METADATA_CSUM;
 681
 682         /*TODO: handle journal feature & inode*/
 683         if (info->journal == 0)
 684                 info->feat_compat |= 0;
 685
 686         if (info->dsc_size == 0) {
 687
 688                 if (info->feat_incompat & EXT4_FINCOM_64BIT)
 689                         info->dsc_size = EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE;
 690                 else
 691                         info->dsc_size = EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE;
 692         }
 693
 694         info->bg_desc_reserve_blocks = 0;
 695
 696         ext4_dbg(DEBUG_MKFS, DBG_INFO "Creating filesystem with parameters:\n");
 697         ext4_dbg(DEBUG_MKFS, DBG_NONE "Size: %"PRIu64"\n", info->len);
 698         ext4_dbg(DEBUG_MKFS, DBG_NONE "Block size: %"PRIu32"\n",
 699                         info->block_size);
 700         ext4_dbg(DEBUG_MKFS, DBG_NONE "Blocks per group: %"PRIu32"\n",
 701                         info->blocks_per_group);
 702         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes per group: %"PRIu32"\n",
 703                         info->inodes_per_group);
 704         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inode size: %"PRIu32"\n",
 705                         info->inode_size);
 706         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes: %"PRIu32"\n", info->inodes);
 707         ext4_dbg(DEBUG_MKFS, DBG_NONE "Journal blocks: %"PRIu32"\n",
 708                         info->journal_blocks);
 709         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features ro_compat: 0x%x\n",
 710                         info->feat_ro_compat);
 711         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features compat: 0x%x\n",
 712                         info->feat_compat);
 713         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features incompat: 0x%x\n",
 714                         info->feat_incompat);
 715         ext4_dbg(DEBUG_MKFS, DBG_NONE "BG desc reserve: %"PRIu32"\n",
 716                         info->bg_desc_reserve_blocks);
 717         ext4_dbg(DEBUG_MKFS, DBG_NONE "Descriptor size: %"PRIu16"\n",
 718                         info->dsc_size);
 719         ext4_dbg(DEBUG_MKFS, DBG_NONE "journal: %s\n",
 720                         info->journal ? "yes" : "no");
 721         ext4_dbg(DEBUG_MKFS, DBG_NONE "Label: %s\n", info->label);
 722
 723         struct ext4_bcache bc;
 724         memset(&bc, 0, sizeof(struct ext4_bcache));
 725         ext4_block_set_lb_size(bd, info->block_size);
 726         r = ext4_bcache_init_dynamic(&bc, CONFIG_BLOCK_DEV_CACHE_SIZE,
 727                                       info->block_size);
 728         if (r != EOK)
 729                 goto block_fini;
 730
 731         /*Bind block cache to block device*/
 732         r = ext4_block_bind_bcache(bd, &bc);
 733         if (r != EOK)
 734                 goto cache_fini;
 735
 736         r = ext4_block_cache_write_back(bd, 1);
 737         if (r != EOK)
 738                 goto cache_fini;
 739
 740         r = mkfs_initial(bd, info);
 741         if (r != EOK)
 742                 goto cache_fini;
 743
 744         r = ext4_fs_init(fs, bd, false);
 745         if (r != EOK)
 746                 goto cache_fini;
 747
 748         r = init_bgs(fs);
 749         if (r != EOK)
 750                 goto fs_fini;
 751
 752         r = alloc_inodes(fs);
 753         if (r != EOK)
 754                 goto fs_fini;
 755
 756         r = create_dirs(fs);
 757         if (r != EOK)
 758                 goto fs_fini;
 759
 760         fs_fini:
 761         ext4_fs_fini(fs);
 762
 763         cache_fini:
 764         ext4_block_cache_write_back(bd, 0);
 765         ext4_bcache_fini_dynamic(&bc);
 766
 767         block_fini:
 768         ext4_block_fini(bd);
 769
 770         return r;
 771 }
 772
 773 /**
 774  * @}
 775  */