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_super.h"
  39 #include "ext4_block_group.h"
  40 #include "ext4_dir.h"
  41 #include "ext4_dir_idx.h"
  42 #include "ext4_fs.h"
  43 #include "ext4_inode.h"
  44 #include "ext4_debug.h"
  45 #include "ext4_ialloc.h"
  46 #include "ext4_mkfs.h"
  47
  48 #include <inttypes.h>
  49 #include <string.h>
  50 #include <stdlib.h>
  51
  52 #define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
  53 #define EXT4_ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))
  54
  55 struct fs_aux_info {
  56         struct ext4_sblock *sb;
  57         struct ext4_bgroup *bg_desc;
  58         struct xattr_list_element *xattrs;
  59         uint32_t first_data_block;
  60         uint64_t len_blocks;
  61         uint32_t inode_table_blocks;
  62         uint32_t groups;
  63         uint32_t bg_desc_blocks;
  64         uint32_t default_i_flags;
  65         uint32_t blocks_per_ind;
  66         uint32_t blocks_per_dind;
  67         uint32_t blocks_per_tind;
  68 };
  69
  70 static inline int log_2(int j)
  71 {
  72         int i;
  73
  74         for (i = 0; j > 0; i++)
  75                 j >>= 1;
  76
  77         return i - 1;
  78 }
  79
  80 static int sb2info(struct ext4_sblock *sb, struct ext4_mkfs_info *info)
  81 {
  82         if (to_le16(sb->magic) != EXT4_SUPERBLOCK_MAGIC)
  83                 return EINVAL;
  84
  85         info->block_size = 1024 << to_le32(sb->log_block_size);
  86         info->blocks_per_group = to_le32(sb->blocks_per_group);
  87         info->inodes_per_group = to_le32(sb->inodes_per_group);
  88         info->inode_size = to_le16(sb->inode_size);
  89         info->inodes = to_le32(sb->inodes_count);
  90         info->feat_ro_compat = to_le32(sb->features_read_only);
  91         info->feat_compat = to_le32(sb->features_compatible);
  92         info->feat_incompat = to_le32(sb->features_incompatible);
  93         info->bg_desc_reserve_blocks = to_le16(sb->s_reserved_gdt_blocks);
  94         info->label = sb->volume_name;
  95         info->len = (uint64_t)info->block_size * ext4_sb_get_blocks_cnt(sb);
  96         info->dsc_size = to_le16(sb->desc_size);
  97
  98         return EOK;
  99 }
 100
 101 static uint32_t compute_blocks_per_group(struct ext4_mkfs_info *info)
 102 {
 103         return info->block_size * 8;
 104 }
 105
 106 static uint32_t compute_inodes(struct ext4_mkfs_info *info)
 107 {
 108         return (uint32_t)DIV_ROUND_UP(info->len, info->block_size) / 4;
 109 }
 110
 111 static uint32_t compute_inodes_per_group(struct ext4_mkfs_info *info)
 112 {
 113         uint32_t blocks = (uint32_t)DIV_ROUND_UP(info->len, info->block_size);
 114         uint32_t block_groups = DIV_ROUND_UP(blocks, info->blocks_per_group);
 115         uint32_t inodes = DIV_ROUND_UP(info->inodes, block_groups);
 116         inodes = EXT4_ALIGN(inodes, (info->block_size / info->inode_size));
 117
 118         /* After properly rounding up the number of inodes/group,
 119          * make sure to update the total inodes field in the info struct.
 120          */
 121         info->inodes = inodes * block_groups;
 122
 123         return inodes;
 124 }
 125
 126
 127 static uint32_t compute_journal_blocks(struct ext4_mkfs_info *info)
 128 {
 129         uint32_t journal_blocks = (uint32_t)DIV_ROUND_UP(info->len,
 130                                                  info->block_size) / 64;
 131         if (journal_blocks < 1024)
 132                 journal_blocks = 1024;
 133         if (journal_blocks > 32768)
 134                 journal_blocks = 32768;
 135         return journal_blocks;
 136 }
 137
 138 static bool has_superblock(struct ext4_mkfs_info *info, uint32_t bgid)
 139 {
 140         if (!(info->feat_ro_compat & EXT4_FRO_COM_SPARSE_SUPER))
 141                 return true;
 142
 143         return ext4_sb_sparse(bgid);
 144 }
 145
 146 static int create_fs_aux_info(struct fs_aux_info *aux_info,
 147                               struct ext4_mkfs_info *info)
 148 {
 149         aux_info->first_data_block = (info->block_size > 1024) ? 0 : 1;
 150         aux_info->len_blocks = info->len / info->block_size;
 151         aux_info->inode_table_blocks = DIV_ROUND_UP(info->inodes_per_group *
 152                         info->inode_size, info->block_size);
 153         aux_info->groups = (uint32_t)DIV_ROUND_UP(aux_info->len_blocks -
 154                         aux_info->first_data_block, info->blocks_per_group);
 155         aux_info->blocks_per_ind = info->block_size / sizeof(uint32_t);
 156         aux_info->blocks_per_dind =
 157                         aux_info->blocks_per_ind * aux_info->blocks_per_ind;
 158         aux_info->blocks_per_tind =
 159                         aux_info->blocks_per_dind * aux_info->blocks_per_dind;
 160
 161         aux_info->bg_desc_blocks =
 162                 DIV_ROUND_UP(aux_info->groups * info->dsc_size,
 163                         info->block_size);
 164
 165         aux_info->default_i_flags = EXT4_INODE_FLAG_NOATIME;
 166
 167         uint32_t last_group_size = aux_info->len_blocks % info->blocks_per_group;
 168         uint32_t last_header_size = 2 + aux_info->inode_table_blocks;
 169         if (has_superblock(info, aux_info->groups - 1))
 170                 last_header_size += 1 + aux_info->bg_desc_blocks +
 171                         info->bg_desc_reserve_blocks;
 172
 173         if (last_group_size > 0 && last_group_size < last_header_size) {
 174                 aux_info->groups--;
 175                 aux_info->len_blocks -= last_group_size;
 176         }
 177
 178         aux_info->sb = calloc(1, EXT4_SUPERBLOCK_SIZE);
 179         if (!aux_info->sb)
 180                 return ENOMEM;
 181
 182         aux_info->bg_desc = calloc(aux_info->groups, sizeof(struct ext4_bgroup));
 183         if (!aux_info->bg_desc)
 184                 return ENOMEM;
 185
 186         aux_info->xattrs = NULL;
 187
 188
 189         ext4_dbg(DEBUG_MKFS, DBG_INFO "create_fs_aux_info\n");
 190         ext4_dbg(DEBUG_MKFS, DBG_NONE "first_data_block: %"PRIu32"\n",
 191                         aux_info->first_data_block);
 192         ext4_dbg(DEBUG_MKFS, DBG_NONE "len_blocks: %"PRIu64"\n",
 193                         aux_info->len_blocks);
 194         ext4_dbg(DEBUG_MKFS, DBG_NONE "inode_table_blocks: %"PRIu32"\n",
 195                         aux_info->inode_table_blocks);
 196         ext4_dbg(DEBUG_MKFS, DBG_NONE "groups: %"PRIu32"\n",
 197                         aux_info->groups);
 198         ext4_dbg(DEBUG_MKFS, DBG_NONE "bg_desc_blocks: %"PRIu32"\n",
 199                         aux_info->bg_desc_blocks);
 200         ext4_dbg(DEBUG_MKFS, DBG_NONE "default_i_flags: %"PRIu32"\n",
 201                         aux_info->default_i_flags);
 202         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_ind: %"PRIu32"\n",
 203                         aux_info->blocks_per_ind);
 204         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_dind: %"PRIu32"\n",
 205                         aux_info->blocks_per_dind);
 206         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_tind: %"PRIu32"\n",
 207                         aux_info->blocks_per_tind);
 208
 209         return EOK;
 210 }
 211
 212 static void release_fs_aux_info(struct fs_aux_info *aux_info)
 213 {
 214         if (aux_info->sb)
 215                 free(aux_info->sb);
 216         if (aux_info->bg_desc)
 217                 free(aux_info->bg_desc);
 218 }
 219
 220
 221 /* Fill in the superblock memory buffer based on the filesystem parameters */
 222 static void fill_in_sb(struct fs_aux_info *aux_info, struct ext4_mkfs_info *info)
 223 {
 224         struct ext4_sblock *sb = aux_info->sb;
 225
 226         sb->inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 227
 228         ext4_sb_set_blocks_cnt(sb, aux_info->len_blocks);
 229         ext4_sb_set_free_blocks_cnt(sb, aux_info->len_blocks);
 230         sb->free_inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 231
 232         sb->reserved_blocks_count_lo = to_le32(0);
 233         sb->first_data_block = to_le32(aux_info->first_data_block);
 234         sb->log_block_size = to_le32(log_2(info->block_size / 1024));
 235         sb->log_cluster_size = to_le32(log_2(info->block_size / 1024));
 236         sb->blocks_per_group = to_le32(info->blocks_per_group);
 237         sb->frags_per_group = to_le32(info->blocks_per_group);
 238         sb->inodes_per_group = to_le32(info->inodes_per_group);
 239         sb->mount_time = to_le32(0);
 240         sb->write_time = to_le32(0);
 241         sb->mount_count = to_le16(0);
 242         sb->max_mount_count = to_le16(0xFFFF);
 243         sb->magic = to_le16(EXT4_SUPERBLOCK_MAGIC);
 244         sb->state = to_le16(EXT4_SUPERBLOCK_STATE_VALID_FS);
 245         sb->errors = to_le16(EXT4_SUPERBLOCK_ERRORS_RO);
 246         sb->minor_rev_level = to_le16(0);
 247         sb->last_check_time = to_le32(0);
 248         sb->check_interval = to_le32(0);
 249         sb->creator_os = to_le32(EXT4_SUPERBLOCK_OS_LINUX);
 250         sb->rev_level = to_le32(1);
 251         sb->def_resuid = to_le16(0);
 252         sb->def_resgid = to_le16(0);
 253
 254         sb->first_inode = to_le32(EXT4_GOOD_OLD_FIRST_INO);
 255         sb->inode_size = to_le16(info->inode_size);
 256         sb->block_group_index = to_le16(0);
 257
 258         sb->features_compatible = to_le32(info->feat_compat);
 259         sb->features_incompatible = to_le32(info->feat_incompat);
 260         sb->features_read_only = to_le32(info->feat_ro_compat);
 261
 262         memset(sb->uuid, 0, sizeof(sb->uuid));
 263
 264         memset(sb->volume_name, 0, sizeof(sb->volume_name));
 265         strncpy(sb->volume_name, info->label, sizeof(sb->volume_name));
 266         memset(sb->last_mounted, 0, sizeof(sb->last_mounted));
 267
 268         sb->algorithm_usage_bitmap = to_le32(0);
 269         sb->s_prealloc_blocks = 0;
 270         sb->s_prealloc_dir_blocks = 0;
 271         sb->s_reserved_gdt_blocks = to_le16(info->bg_desc_reserve_blocks);
 272
 273         if (info->feat_compat & EXT4_FCOM_HAS_JOURNAL)
 274                 sb->journal_inode_number = to_le32(EXT4_JOURNAL_INO);
 275         sb->journal_dev = to_le32(0);
 276         sb->last_orphan = to_le32(0);
 277         sb->hash_seed[0] = to_le32(0x11111111);
 278         sb->hash_seed[1] = to_le32(0x22222222);
 279         sb->hash_seed[2] = to_le32(0x33333333);
 280         sb->hash_seed[3] = to_le32(0x44444444);
 281         sb->default_hash_version = EXT2_HTREE_HALF_MD4;
 282         sb->checksum_type = 1;
 283         sb->desc_size = to_le16(info->dsc_size);
 284         sb->default_mount_opts = to_le32(0);
 285         sb->first_meta_bg = to_le32(0);
 286         sb->mkfs_time = to_le32(0);
 287
 288         sb->reserved_blocks_count_hi = to_le32(0);
 289         sb->min_extra_isize = to_le32(sizeof(struct ext4_inode) -
 290                 EXT4_GOOD_OLD_INODE_SIZE);
 291         sb->want_extra_isize = to_le32(sizeof(struct ext4_inode) -
 292                 EXT4_GOOD_OLD_INODE_SIZE);
 293         sb->flags = to_le32(EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH);
 294 }
 295
 296 static void fill_bgroups(struct fs_aux_info *aux_info,
 297                          struct ext4_mkfs_info *info)
 298 {
 299         uint32_t i;
 300
 301         uint32_t bg_free_blk = 0;
 302         uint64_t sb_free_blk = 0;
 303
 304         for (i = 0; i < aux_info->groups; i++) {
 305
 306                 uint64_t bg_start_block = aux_info->first_data_block +
 307                         aux_info->first_data_block + i * info->blocks_per_group;
 308                 uint32_t blk_off = 0;
 309
 310                 bg_free_blk = info->blocks_per_group -
 311                                 aux_info->inode_table_blocks;
 312
 313                 bg_free_blk -= 2;
 314                 blk_off += aux_info->bg_desc_blocks;
 315
 316                 if (i == (aux_info->groups - 1))
 317                         bg_free_blk -= aux_info->first_data_block;
 318
 319                 if (has_superblock(info, i)) {
 320                         bg_start_block++;
 321                         blk_off += info->bg_desc_reserve_blocks;
 322                         bg_free_blk -= info->bg_desc_reserve_blocks + 1;
 323                         bg_free_blk -= aux_info->bg_desc_blocks;
 324                 }
 325
 326                 ext4_bg_set_block_bitmap(&aux_info->bg_desc[i], aux_info->sb,
 327                                 bg_start_block + blk_off + 1);
 328
 329                 ext4_bg_set_inode_bitmap(&aux_info->bg_desc[i], aux_info->sb,
 330                                 bg_start_block + blk_off + 2);
 331
 332                 ext4_bg_set_inode_table_first_block(&aux_info->bg_desc[i],
 333                                 aux_info->sb,
 334                                 bg_start_block + blk_off + 3);
 335
 336                 ext4_bg_set_free_blocks_count(&aux_info->bg_desc[i],
 337                                 aux_info->sb, bg_free_blk);
 338
 339                 ext4_bg_set_free_inodes_count(&aux_info->bg_desc[i],
 340                                 aux_info->sb, aux_info->sb->inodes_per_group);
 341
 342                 ext4_bg_set_used_dirs_count(&aux_info->bg_desc[i], aux_info->sb,
 343                                             0);
 344
 345                 ext4_bg_set_flag(&aux_info->bg_desc[i],
 346                                 EXT4_BLOCK_GROUP_BLOCK_UNINIT |
 347                                 EXT4_BLOCK_GROUP_INODE_UNINIT);
 348
 349                 sb_free_blk += bg_free_blk;
 350         }
 351
 352         ext4_sb_set_free_blocks_cnt(aux_info->sb, sb_free_blk);
 353 }
 354
 355
 356 static int write_bgroups(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 357                          struct ext4_mkfs_info *info)
 358 {
 359         int r;
 360         uint32_t i;
 361         struct ext4_block b;
 362         for (i = 0; i < aux_info->groups; i++) {
 363                 uint64_t bg_start_block = aux_info->first_data_block +
 364                         + i * info->blocks_per_group;
 365                 uint32_t blk_off = 0;
 366
 367                 blk_off += aux_info->bg_desc_blocks;
 368                 if (has_superblock(info, i)) {
 369                         bg_start_block++;
 370                         blk_off += info->bg_desc_reserve_blocks;
 371                 }
 372
 373                 uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 374                 uint32_t dsc_pos = 0;
 375                 uint32_t dsc_id = 0;
 376                 uint32_t dsc_size = ext4_sb_get_desc_size(aux_info->sb);
 377                 uint32_t dsc_blk_cnt = aux_info->bg_desc_blocks;
 378                 uint64_t dsc_blk = bg_start_block;
 379
 380                 while (dsc_blk_cnt--) {
 381                         r = ext4_block_get(bd, &b, dsc_blk++);
 382                         if (r != EOK)
 383                                 return r;
 384
 385                         dsc_pos = 0;
 386                         while (dsc_pos + dsc_size <= block_size) {
 387                                 memcpy(b.data + dsc_pos,
 388                                        &aux_info->bg_desc[dsc_id],
 389                                        dsc_size);
 390
 391                                 dsc_pos += dsc_size;
 392                                 dsc_id++;
 393
 394                                 if (dsc_id == aux_info->groups)
 395                                         break;
 396                         }
 397
 398                         ext4_bcache_set_dirty(b.buf);
 399                         r = ext4_block_set(bd, &b);
 400                         if (r != EOK)
 401                                 return r;
 402
 403                         if (dsc_id == aux_info->groups)
 404                                 break;
 405                 }
 406
 407                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 1);
 408                 if (r != EOK)
 409                         return r;
 410                 memset(b.data, 0, block_size);
 411                 ext4_bcache_set_dirty(b.buf);
 412                 r = ext4_block_set(bd, &b);
 413                 if (r != EOK)
 414                         return r;
 415                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 2);
 416                 if (r != EOK)
 417                         return r;
 418                 memset(b.data, 0, block_size);
 419                 ext4_bcache_set_dirty(b.buf);
 420                 r = ext4_block_set(bd, &b);
 421                 if (r != EOK)
 422                         return r;
 423         }
 424
 425
 426         return r;
 427 }
 428
 429 static int write_sblocks(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 430                           struct ext4_mkfs_info *info)
 431 {
 432         uint64_t offset;
 433         uint32_t i;
 434         int r;
 435
 436         /* write out the backup superblocks */
 437         for (i = 1; i < aux_info->groups; i++) {
 438                 if (has_superblock(info, i)) {
 439                         offset = info->block_size * (aux_info->first_data_block
 440                                 + i * info->blocks_per_group);
 441
 442                         aux_info->sb->block_group_index = to_le16(i);
 443                         r = ext4_block_writebytes(bd, offset, aux_info->sb,
 444                                                   EXT4_SUPERBLOCK_SIZE);
 445                         if (r != EOK)
 446                                 return r;
 447                 }
 448         }
 449
 450         /* write out the primary superblock */
 451         aux_info->sb->block_group_index = to_le16(0);
 452         return ext4_block_writebytes(bd, 1024, aux_info->sb,
 453                         EXT4_SUPERBLOCK_SIZE);
 454 }
 455
 456
 457 int ext4_mkfs_read_info(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 458 {
 459         int r;
 460         struct ext4_sblock *sb = NULL;
 461         r = ext4_block_init(bd);
 462         if (r != EOK)
 463                 return r;
 464
 465         sb = malloc(EXT4_SUPERBLOCK_SIZE);
 466         if (!sb)
 467                 goto Finish;
 468
 469
 470         r = ext4_sb_read(bd, sb);
 471         if (r != EOK)
 472                 goto Finish;
 473
 474         r = sb2info(sb, info);
 475
 476 Finish:
 477         if (sb)
 478                 free(sb);
 479         ext4_block_fini(bd);
 480         return r;
 481 }
 482
 483 static int mkfs_initial(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 484 {
 485         int r;
 486         struct fs_aux_info aux_info;
 487         memset(&aux_info, 0, sizeof(struct fs_aux_info));
 488
 489         r = create_fs_aux_info(&aux_info, info);
 490         if (r != EOK)
 491                 goto Finish;
 492
 493         fill_in_sb(&aux_info, info);
 494         fill_bgroups(&aux_info, info);
 495
 496
 497         r = write_bgroups(bd, &aux_info, info);
 498         if (r != EOK)
 499                 goto Finish;
 500
 501         r = write_sblocks(bd, &aux_info, info);
 502         if (r != EOK)
 503                 goto Finish;
 504
 505         Finish:
 506         release_fs_aux_info(&aux_info);
 507         return r;
 508 }
 509
 510 static int init_bgs(struct ext4_fs *fs)
 511 {
 512         int r = EOK;
 513         struct ext4_block_group_ref ref;
 514         uint32_t i;
 515         uint32_t bg_count = ext4_block_group_cnt(&fs->sb);
 516         for (i = 0; i < bg_count; ++i) {
 517                 r = ext4_fs_get_block_group_ref(fs, i, &ref);
 518                 if (r != EOK)
 519                         break;
 520
 521                 r = ext4_fs_put_block_group_ref(&ref);
 522                 if (r != EOK)
 523                         break;
 524         }
 525         return r;
 526 }
 527
 528 static int alloc_inodes(struct ext4_fs *fs)
 529 {
 530         int r = EOK;
 531         int i;
 532         struct ext4_inode_ref inode_ref;
 533         for (i = 1; i < 12; ++i) {
 534                 int filetype = EXT4_DE_REG_FILE;
 535
 536                 switch (i) {
 537                 case EXT4_ROOT_INO:
 538                 case EXT4_GOOD_OLD_FIRST_INO:
 539                         filetype = EXT4_DE_DIR;
 540                         break;
 541                 }
 542
 543                 r = ext4_fs_alloc_inode(fs, &inode_ref, filetype);
 544                 if (r != EOK)
 545                         return r;
 546
 547                 ext4_inode_set_mode(&fs->sb, inode_ref.inode, 0);
 548                 ext4_fs_put_inode_ref(&inode_ref);
 549         }
 550
 551         return r;
 552 }
 553
 554 static int create_dirs(struct ext4_fs *fs)
 555 {
 556         int r = EOK;
 557         struct ext4_inode_ref root;
 558         struct ext4_inode_ref child;
 559
 560         r = ext4_fs_get_inode_ref(fs, EXT4_ROOT_INO, &root);
 561         if (r != EOK)
 562                 return r;
 563
 564         r = ext4_fs_get_inode_ref(fs, EXT4_GOOD_OLD_FIRST_INO, &child);
 565         if (r != EOK)
 566                 return r;
 567
 568         ext4_inode_set_mode(&fs->sb, child.inode,
 569                         EXT4_INODE_MODE_DIRECTORY | 0777);
 570
 571         ext4_inode_set_mode(&fs->sb, root.inode,
 572                         EXT4_INODE_MODE_DIRECTORY | 0777);
 573
 574 #if CONFIG_DIR_INDEX_ENABLE
 575         /* Initialize directory index if supported */
 576         if (ext4_sb_feature_com(&fs->sb, EXT4_FCOM_DIR_INDEX)) {
 577                 r = ext4_dir_dx_init(&root, &root);
 578                 if (r != EOK)
 579                         return r;
 580
 581                 r = ext4_dir_dx_init(&child, &root);
 582                 if (r != EOK)
 583                         return r;
 584
 585                 ext4_inode_set_flag(root.inode, EXT4_INODE_FLAG_INDEX);
 586                 ext4_inode_set_flag(child.inode, EXT4_INODE_FLAG_INDEX);
 587         } else
 588 #endif
 589         {
 590                 r = ext4_dir_add_entry(&root, ".", strlen("."), &root);
 591                 if (r != EOK)
 592                         return r;
 593
 594                 r = ext4_dir_add_entry(&root, "..", strlen(".."), &root);
 595                 if (r != EOK)
 596                         return r;
 597
 598                 r = ext4_dir_add_entry(&child, ".", strlen("."), &child);
 599                 if (r != EOK)
 600                         return r;
 601
 602                 r = ext4_dir_add_entry(&child, "..", strlen(".."), &root);
 603                 if (r != EOK)
 604                         return r;
 605         }
 606
 607         r = ext4_dir_add_entry(&root, "lost+found", strlen("lost+found"), &child);
 608         if (r != EOK)
 609                 return r;
 610
 611         ext4_inode_set_links_cnt(root.inode, 3);
 612         ext4_inode_set_links_cnt(child.inode, 2);
 613
 614         child.dirty = true;
 615         root.dirty = true;
 616         ext4_fs_put_inode_ref(&child);
 617         ext4_fs_put_inode_ref(&root);
 618         return r;
 619 }
 620
 621 int ext4_mkfs(struct ext4_fs *fs, struct ext4_blockdev *bd,
 622               struct ext4_mkfs_info *info, int fs_type)
 623 {
 624         int r;
 625
 626         r = ext4_block_init(bd);
 627         if (r != EOK)
 628                 return r;
 629
 630         bd->fs = fs;
 631
 632         if (info->len == 0)
 633                 info->len = bd->bdif->ph_bcnt * bd->bdif->ph_bsize;
 634
 635         if (info->block_size == 0)
 636                 info->block_size = 4096; /*Set block size to default value*/
 637
 638         /* Round down the filesystem length to be a multiple of the block size */
 639         info->len &= ~((uint64_t)info->block_size - 1);
 640
 641         if (info->journal_blocks == 0)
 642                 info->journal_blocks = compute_journal_blocks(info);
 643
 644         if (info->blocks_per_group == 0)
 645                 info->blocks_per_group = compute_blocks_per_group(info);
 646
 647         if (info->inodes == 0)
 648                 info->inodes = compute_inodes(info);
 649
 650         if (info->inode_size == 0)
 651                 info->inode_size = 256;
 652
 653         if (info->label == NULL)
 654                 info->label = "";
 655
 656         info->inodes_per_group = compute_inodes_per_group(info);
 657
 658         switch (fs_type) {
 659         case F_SET_EXT2:
 660                 info->feat_compat = EXT2_SUPPORTED_FCOM;
 661                 info->feat_ro_compat = EXT2_SUPPORTED_FRO_COM;
 662                 info->feat_incompat = EXT2_SUPPORTED_FINCOM;
 663                 break;
 664         case F_SET_EXT3:
 665                 info->feat_compat = EXT3_SUPPORTED_FCOM;
 666                 info->feat_ro_compat = EXT3_SUPPORTED_FRO_COM;
 667                 info->feat_incompat = EXT3_SUPPORTED_FINCOM;
 668                 break;
 669         case F_SET_EXT4:
 670                 info->feat_compat = EXT4_SUPPORTED_FCOM;
 671                 info->feat_ro_compat = EXT4_SUPPORTED_FRO_COM;
 672                 info->feat_incompat = EXT4_SUPPORTED_FINCOM;
 673                 break;
 674         }
 675
 676         /*TODO: handle this features*/
 677         info->feat_incompat &= ~EXT4_FINCOM_META_BG;
 678         info->feat_incompat &= ~EXT4_FINCOM_FLEX_BG;
 679         info->feat_ro_compat &= ~EXT4_FRO_COM_METADATA_CSUM;
 680
 681         /*TODO: handle journal feature & inode*/
 682         if (info->journal == 0)
 683                 info->feat_compat |= 0;
 684
 685         if (info->dsc_size == 0) {
 686
 687                 if (info->feat_incompat & EXT4_FINCOM_64BIT)
 688                         info->dsc_size = EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE;
 689                 else
 690                         info->dsc_size = EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE;
 691         }
 692
 693         info->bg_desc_reserve_blocks = 0;
 694
 695         ext4_dbg(DEBUG_MKFS, DBG_INFO "Creating filesystem with parameters:\n");
 696         ext4_dbg(DEBUG_MKFS, DBG_NONE "Size: %"PRIu64"\n", info->len);
 697         ext4_dbg(DEBUG_MKFS, DBG_NONE "Block size: %"PRIu32"\n",
 698                         info->block_size);
 699         ext4_dbg(DEBUG_MKFS, DBG_NONE "Blocks per group: %"PRIu32"\n",
 700                         info->blocks_per_group);
 701         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes per group: %"PRIu32"\n",
 702                         info->inodes_per_group);
 703         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inode size: %"PRIu32"\n",
 704                         info->inode_size);
 705         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes: %"PRIu32"\n", info->inodes);
 706         ext4_dbg(DEBUG_MKFS, DBG_NONE "Journal blocks: %"PRIu32"\n",
 707                         info->journal_blocks);
 708         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features ro_compat: 0x%x\n",
 709                         info->feat_ro_compat);
 710         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features compat: 0x%x\n",
 711                         info->feat_compat);
 712         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features incompat: 0x%x\n",
 713                         info->feat_incompat);
 714         ext4_dbg(DEBUG_MKFS, DBG_NONE "BG desc reserve: %"PRIu32"\n",
 715                         info->bg_desc_reserve_blocks);
 716         ext4_dbg(DEBUG_MKFS, DBG_NONE "Descriptor size: %"PRIu16"\n",
 717                         info->dsc_size);
 718         ext4_dbg(DEBUG_MKFS, DBG_NONE "journal: %s\n",
 719                         info->journal ? "yes" : "no");
 720         ext4_dbg(DEBUG_MKFS, DBG_NONE "Label: %s\n", info->label);
 721
 722         struct ext4_bcache bc;
 723         memset(&bc, 0, sizeof(struct ext4_bcache));
 724         ext4_block_set_lb_size(bd, info->block_size);
 725         r = ext4_bcache_init_dynamic(&bc, CONFIG_BLOCK_DEV_CACHE_SIZE,
 726                                       info->block_size);
 727         if (r != EOK)
 728                 goto block_fini;
 729
 730         /*Bind block cache to block device*/
 731         r = ext4_block_bind_bcache(bd, &bc);
 732         if (r != EOK)
 733                 goto cache_fini;
 734
 735         r = ext4_block_cache_write_back(bd, 1);
 736         if (r != EOK)
 737                 goto cache_fini;
 738
 739         r = mkfs_initial(bd, info);
 740         if (r != EOK)
 741                 goto cache_fini;
 742
 743         r = ext4_fs_init(fs, bd, false);
 744         if (r != EOK)
 745                 goto cache_fini;
 746
 747         r = init_bgs(fs);
 748         if (r != EOK)
 749                 goto fs_fini;
 750
 751         r = alloc_inodes(fs);
 752         if (r != EOK)
 753                 goto fs_fini;
 754
 755         r = create_dirs(fs);
 756         if (r != EOK)
 757                 goto fs_fini;
 758
 759         fs_fini:
 760         ext4_fs_fini(fs);
 761
 762         cache_fini:
 763         ext4_block_cache_write_back(bd, 0);
 764         ext4_bcache_fini_dynamic(&bc);
 765
 766         block_fini:
 767         ext4_block_fini(bd);
 768
 769         return r;
 770 }
 771
 772 /**
 773  * @}
 774  */