lwext4/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 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 = 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 = DIV_ROUND_UP(info->len, info->block_size) / 64;
 130         if (journal_blocks < 1024)
 131                 journal_blocks = 1024;
 132         if (journal_blocks > 32768)
 133                 journal_blocks = 32768;
 134         return journal_blocks;
 135 }
 136
 137 static bool has_superblock(struct ext4_mkfs_info *info, uint32_t bgid)
 138 {
 139         if (!(info->feat_ro_compat & EXT4_FRO_COM_SPARSE_SUPER))
 140                 return true;
 141
 142         return ext4_sb_sparse(bgid);
 143 }
 144
 145 static int create_fs_aux_info(struct fs_aux_info *aux_info,
 146                               struct ext4_mkfs_info *info)
 147 {
 148         aux_info->first_data_block = (info->block_size > 1024) ? 0 : 1;
 149         aux_info->len_blocks = info->len / info->block_size;
 150         aux_info->inode_table_blocks = DIV_ROUND_UP(info->inodes_per_group *
 151                         info->inode_size, info->block_size);
 152         aux_info->groups = DIV_ROUND_UP(aux_info->len_blocks -
 153                         aux_info->first_data_block, info->blocks_per_group);
 154         aux_info->blocks_per_ind = info->block_size / sizeof(uint32_t);
 155         aux_info->blocks_per_dind =
 156                         aux_info->blocks_per_ind * aux_info->blocks_per_ind;
 157         aux_info->blocks_per_tind =
 158                         aux_info->blocks_per_dind * aux_info->blocks_per_dind;
 159
 160         aux_info->bg_desc_blocks =
 161                 DIV_ROUND_UP(aux_info->groups * info->dsc_size,
 162                         info->block_size);
 163
 164         aux_info->default_i_flags = EXT4_INODE_FLAG_NOATIME;
 165
 166         uint32_t last_group_size = aux_info->len_blocks % info->blocks_per_group;
 167         uint32_t last_header_size = 2 + aux_info->inode_table_blocks;
 168         if (has_superblock(info, aux_info->groups - 1))
 169                 last_header_size += 1 + aux_info->bg_desc_blocks +
 170                         info->bg_desc_reserve_blocks;
 171
 172         if (last_group_size > 0 && last_group_size < last_header_size) {
 173                 aux_info->groups--;
 174                 aux_info->len_blocks -= last_group_size;
 175         }
 176
 177         aux_info->sb = calloc(1, EXT4_SUPERBLOCK_SIZE);
 178         if (!aux_info->sb)
 179                 return ENOMEM;
 180
 181         aux_info->bg_desc = calloc(aux_info->groups, sizeof(struct ext4_bgroup));
 182         if (!aux_info->bg_desc)
 183                 return ENOMEM;
 184
 185         aux_info->xattrs = NULL;
 186
 187
 188         ext4_dbg(DEBUG_MKFS, DBG_INFO "create_fs_aux_info\n");
 189         ext4_dbg(DEBUG_MKFS, DBG_NONE "first_data_block: %"PRIu32"\n",
 190                         aux_info->first_data_block);
 191         ext4_dbg(DEBUG_MKFS, DBG_NONE "len_blocks: %"PRIu64"\n",
 192                         aux_info->len_blocks);
 193         ext4_dbg(DEBUG_MKFS, DBG_NONE "inode_table_blocks: %"PRIu32"\n",
 194                         aux_info->inode_table_blocks);
 195         ext4_dbg(DEBUG_MKFS, DBG_NONE "groups: %"PRIu32"\n",
 196                         aux_info->groups);
 197         ext4_dbg(DEBUG_MKFS, DBG_NONE "bg_desc_blocks: %"PRIu32"\n",
 198                         aux_info->bg_desc_blocks);
 199         ext4_dbg(DEBUG_MKFS, DBG_NONE "default_i_flags: %"PRIu32"\n",
 200                         aux_info->default_i_flags);
 201         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_ind: %"PRIu32"\n",
 202                         aux_info->blocks_per_ind);
 203         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_dind: %"PRIu32"\n",
 204                         aux_info->blocks_per_dind);
 205         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_tind: %"PRIu32"\n",
 206                         aux_info->blocks_per_tind);
 207
 208         return EOK;
 209 }
 210
 211 static void release_fs_aux_info(struct fs_aux_info *aux_info)
 212 {
 213         if (aux_info->sb)
 214                 free(aux_info->sb);
 215         if (aux_info->bg_desc)
 216                 free(aux_info->bg_desc);
 217 }
 218
 219
 220 /* Fill in the superblock memory buffer based on the filesystem parameters */
 221 static void fill_in_sb(struct fs_aux_info *aux_info, struct ext4_mkfs_info *info)
 222 {
 223         struct ext4_sblock *sb = aux_info->sb;
 224
 225         sb->inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 226
 227         ext4_sb_set_blocks_cnt(sb, aux_info->len_blocks);
 228         ext4_sb_set_free_blocks_cnt(sb, aux_info->len_blocks);
 229         sb->free_inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 230
 231         sb->reserved_blocks_count_lo = to_le32(0);
 232         sb->first_data_block = to_le32(aux_info->first_data_block);
 233         sb->log_block_size = to_le32(log_2(info->block_size / 1024));
 234         sb->log_cluster_size = to_le32(log_2(info->block_size / 1024));
 235         sb->blocks_per_group = to_le32(info->blocks_per_group);
 236         sb->frags_per_group = to_le32(info->blocks_per_group);
 237         sb->inodes_per_group = to_le32(info->inodes_per_group);
 238         sb->mount_time = to_le32(0);
 239         sb->write_time = to_le32(0);
 240         sb->mount_count = to_le16(0);
 241         sb->max_mount_count = to_le16(0xFFFF);
 242         sb->magic = to_le16(EXT4_SUPERBLOCK_MAGIC);
 243         sb->state = to_le16(EXT4_SUPERBLOCK_STATE_VALID_FS);
 244         sb->errors = to_le16(EXT4_SUPERBLOCK_ERRORS_RO);
 245         sb->minor_rev_level = to_le16(0);
 246         sb->last_check_time = to_le32(0);
 247         sb->check_interval = to_le32(0);
 248         sb->creator_os = to_le32(EXT4_SUPERBLOCK_OS_LINUX);
 249         sb->rev_level = to_le32(1);
 250         sb->def_resuid = to_le16(0);
 251         sb->def_resgid = to_le16(0);
 252
 253         sb->first_inode = to_le32(EXT4_GOOD_OLD_FIRST_INO);
 254         sb->inode_size = to_le16(info->inode_size);
 255         sb->block_group_index = to_le16(0);
 256
 257         sb->features_compatible = to_le32(info->feat_compat);
 258         sb->features_incompatible = to_le32(info->feat_incompat);
 259         sb->features_read_only = to_le32(info->feat_ro_compat);
 260
 261         memset(sb->uuid, 0, sizeof(sb->uuid));
 262
 263         memset(sb->volume_name, 0, sizeof(sb->volume_name));
 264         strncpy(sb->volume_name, info->label, sizeof(sb->volume_name));
 265         memset(sb->last_mounted, 0, sizeof(sb->last_mounted));
 266
 267         sb->algorithm_usage_bitmap = to_le32(0);
 268         sb->s_prealloc_blocks = 0;
 269         sb->s_prealloc_dir_blocks = 0;
 270         sb->s_reserved_gdt_blocks = to_le16(info->bg_desc_reserve_blocks);
 271
 272         if (info->feat_compat & EXT4_FCOM_HAS_JOURNAL)
 273                 sb->journal_inode_number = to_le32(EXT4_JOURNAL_INO);
 274         sb->journal_dev = to_le32(0);
 275         sb->last_orphan = to_le32(0);
 276         sb->hash_seed[0] = to_le32(0x11111111);
 277         sb->hash_seed[1] = to_le32(0x22222222);
 278         sb->hash_seed[2] = to_le32(0x33333333);
 279         sb->hash_seed[3] = to_le32(0x44444444);
 280         sb->default_hash_version = EXT2_HTREE_HALF_MD4;
 281         sb->checksum_type = 1;
 282         sb->desc_size = to_le16(info->dsc_size);
 283         sb->default_mount_opts = to_le32(0);
 284         sb->first_meta_bg = to_le32(0);
 285         sb->mkfs_time = to_le32(0);
 286
 287         sb->reserved_blocks_count_hi = to_le32(0);
 288         sb->min_extra_isize = to_le32(sizeof(struct ext4_inode) -
 289                 EXT4_GOOD_OLD_INODE_SIZE);
 290         sb->want_extra_isize = to_le32(sizeof(struct ext4_inode) -
 291                 EXT4_GOOD_OLD_INODE_SIZE);
 292         sb->flags = to_le32(EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH);
 293 }
 294
 295 static void fill_bgroups(struct fs_aux_info *aux_info,
 296                          struct ext4_mkfs_info *info)
 297 {
 298         uint32_t i;
 299
 300         uint64_t bg_free_blk = 0;
 301         uint64_t sb_free_blk = 0;
 302
 303         for (i = 0; i < aux_info->groups; i++) {
 304
 305                 uint64_t bg_start_block = aux_info->first_data_block +
 306                         aux_info->first_data_block + i * info->blocks_per_group;
 307                 uint32_t blk_off = 0;
 308
 309                 bg_free_blk = info->blocks_per_group -
 310                                 aux_info->inode_table_blocks;
 311
 312                 bg_free_blk -= 2;
 313                 blk_off += aux_info->bg_desc_blocks;
 314
 315                 if (i == (aux_info->groups - 1))
 316                         bg_free_blk -= aux_info->first_data_block;
 317
 318                 if (has_superblock(info, i)) {
 319                         bg_start_block++;
 320                         blk_off += info->bg_desc_reserve_blocks;
 321                         bg_free_blk -= info->bg_desc_reserve_blocks + 1;
 322                         bg_free_blk -= aux_info->bg_desc_blocks;
 323                 }
 324
 325                 ext4_bg_set_block_bitmap(&aux_info->bg_desc[i], aux_info->sb,
 326                                 bg_start_block + blk_off + 1);
 327
 328                 ext4_bg_set_inode_bitmap(&aux_info->bg_desc[i], aux_info->sb,
 329                                 bg_start_block + blk_off + 2);
 330
 331                 ext4_bg_set_inode_table_first_block(&aux_info->bg_desc[i],
 332                                 aux_info->sb,
 333                                 bg_start_block + blk_off + 3);
 334
 335                 ext4_bg_set_free_blocks_count(&aux_info->bg_desc[i],
 336                                 aux_info->sb, bg_free_blk);
 337
 338                 ext4_bg_set_free_inodes_count(&aux_info->bg_desc[i],
 339                                 aux_info->sb, aux_info->sb->inodes_per_group);
 340
 341                 ext4_bg_set_used_dirs_count(&aux_info->bg_desc[i], aux_info->sb,
 342                                             0);
 343
 344                 ext4_bg_set_flag(&aux_info->bg_desc[i],
 345                                 EXT4_BLOCK_GROUP_BLOCK_UNINIT |
 346                                 EXT4_BLOCK_GROUP_INODE_UNINIT);
 347
 348                 sb_free_blk += bg_free_blk;
 349         }
 350
 351         ext4_sb_set_free_blocks_cnt(aux_info->sb, sb_free_blk);
 352 }
 353
 354
 355 static int write_bgroups(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 356                          struct ext4_mkfs_info *info)
 357 {
 358         int r;
 359         uint32_t i;
 360         struct ext4_block b;
 361         for (i = 0; i < aux_info->groups; i++) {
 362                 uint64_t bg_start_block = aux_info->first_data_block +
 363                         + i * info->blocks_per_group;
 364                 uint32_t blk_off = 0;
 365
 366                 blk_off += aux_info->bg_desc_blocks;
 367                 if (has_superblock(info, i)) {
 368                         bg_start_block++;
 369                         blk_off += info->bg_desc_reserve_blocks;
 370                 }
 371
 372                 uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 373                 uint32_t dsc_pos = 0;
 374                 uint32_t dsc_id = 0;
 375                 uint32_t dsc_size = ext4_sb_get_desc_size(aux_info->sb);
 376                 uint32_t dsc_blk_cnt = aux_info->bg_desc_blocks;
 377                 uint64_t dsc_blk = bg_start_block;
 378
 379                 while (dsc_blk_cnt--) {
 380                         r = ext4_block_get(bd, &b, dsc_blk++);
 381                         if (r != EOK)
 382                                 return r;
 383
 384                         dsc_pos = 0;
 385                         while (dsc_pos + dsc_size <= block_size) {
 386                                 memcpy(b.data + dsc_pos,
 387                                        &aux_info->bg_desc[dsc_id],
 388                                        dsc_size);
 389
 390                                 dsc_pos += dsc_size;
 391                                 dsc_id++;
 392
 393                                 if (dsc_id == aux_info->groups)
 394                                         break;
 395                         }
 396
 397                         b.dirty = true;
 398                         r = ext4_block_set(bd, &b);
 399                         if (r != EOK)
 400                                 return r;
 401
 402                         if (dsc_id == aux_info->groups)
 403                                 break;
 404                 }
 405
 406                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 1);
 407                 if (r != EOK)
 408                         return r;
 409                 memset(b.data, 0, block_size);
 410                 b.dirty = true;
 411                 r = ext4_block_set(bd, &b);
 412                 if (r != EOK)
 413                         return r;
 414                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 2);
 415                 if (r != EOK)
 416                         return r;
 417                 memset(b.data, 0, block_size);
 418                 b.dirty = true;
 419                 r = ext4_block_set(bd, &b);
 420                 if (r != EOK)
 421                         return r;
 422         }
 423
 424
 425         return r;
 426 }
 427
 428 static int write_sblocks(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 429                           struct ext4_mkfs_info *info)
 430 {
 431         uint64_t offset;
 432         uint32_t i;
 433         int r;
 434
 435         /* write out the backup superblocks */
 436         for (i = 1; i < aux_info->groups; i++) {
 437                 if (has_superblock(info, i)) {
 438                         offset = info->block_size * (aux_info->first_data_block
 439                                 + i * info->blocks_per_group);
 440
 441                         aux_info->sb->block_group_index = to_le16(i);
 442                         r = ext4_block_writebytes(bd, offset, aux_info->sb,
 443                                                   EXT4_SUPERBLOCK_SIZE);
 444                         if (r != EOK)
 445                                 return r;
 446                 }
 447         }
 448
 449         /* write out the primary superblock */
 450         aux_info->sb->block_group_index = to_le16(0);
 451         return ext4_block_writebytes(bd, 1024, aux_info->sb,
 452                         EXT4_SUPERBLOCK_SIZE);
 453 }
 454
 455
 456 int ext4_mkfs_read_info(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 457 {
 458         int r;
 459         struct ext4_sblock *sb = NULL;
 460         r = ext4_block_init(bd);
 461         if (r != EOK)
 462                 return r;
 463
 464         sb = malloc(EXT4_SUPERBLOCK_SIZE);
 465         if (!sb)
 466                 goto Finish;
 467
 468
 469         r = ext4_sb_read(bd, sb);
 470         if (r != EOK)
 471                 goto Finish;
 472
 473         r = sb2info(sb, info);
 474
 475 Finish:
 476         if (sb)
 477                 free(sb);
 478         ext4_block_fini(bd);
 479         return r;
 480 }
 481
 482 static int mkfs_initial(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 483 {
 484         int r;
 485         struct fs_aux_info aux_info;
 486         memset(&aux_info, 0, sizeof(struct fs_aux_info));
 487
 488         r = create_fs_aux_info(&aux_info, info);
 489         if (r != EOK)
 490                 goto Finish;
 491
 492         fill_in_sb(&aux_info, info);
 493         fill_bgroups(&aux_info, info);
 494
 495
 496         r = write_bgroups(bd, &aux_info, info);
 497         if (r != EOK)
 498                 goto Finish;
 499
 500         r = write_sblocks(bd, &aux_info, info);
 501         if (r != EOK)
 502                 goto Finish;
 503
 504         Finish:
 505         release_fs_aux_info(&aux_info);
 506         return r;
 507 }
 508
 509 static int init_bgs(struct ext4_fs *fs)
 510 {
 511         int r = EOK;
 512         struct ext4_block_group_ref ref;
 513         uint32_t i;
 514         uint32_t bg_count = ext4_block_group_cnt(&fs->sb);
 515         for (i = 0; i < bg_count; ++i) {
 516                 r = ext4_fs_get_block_group_ref(fs, i, &ref);
 517                 if (r != EOK)
 518                         break;
 519
 520                 r = ext4_fs_put_block_group_ref(&ref);
 521                 if (r != EOK)
 522                         break;
 523         }
 524         return r;
 525 }
 526
 527 static int alloc_inodes(struct ext4_fs *fs)
 528 {
 529         int r = EOK;
 530         int i;
 531         struct ext4_inode_ref inode_ref;
 532         for (i = 1; i < 12; ++i) {
 533                 int filetype = EXT4_DE_REG_FILE;
 534
 535                 switch (i) {
 536                 case EXT4_ROOT_INO:
 537                 case EXT4_GOOD_OLD_FIRST_INO:
 538                         filetype = EXT4_DE_DIR;
 539                         break;
 540                 }
 541
 542                 r = ext4_fs_alloc_inode(fs, &inode_ref, filetype);
 543                 if (r != EOK)
 544                         return r;
 545
 546                 ext4_inode_set_mode(&fs->sb, inode_ref.inode, 0);
 547                 ext4_fs_put_inode_ref(&inode_ref);
 548         }
 549
 550         return r;
 551 }
 552
 553 static int create_dirs(struct ext4_fs *fs)
 554 {
 555         int r = EOK;
 556         struct ext4_inode_ref root;
 557         struct ext4_inode_ref child;
 558
 559         r = ext4_fs_get_inode_ref(fs, EXT4_ROOT_INO, &root);
 560         if (r != EOK)
 561                 return r;
 562
 563         r = ext4_fs_get_inode_ref(fs, EXT4_GOOD_OLD_FIRST_INO, &child);
 564         if (r != EOK)
 565                 return r;
 566
 567         ext4_inode_set_mode(&fs->sb, child.inode,
 568                         EXT4_INODE_MODE_DIRECTORY | 0777);
 569
 570         ext4_inode_set_mode(&fs->sb, root.inode,
 571                         EXT4_INODE_MODE_DIRECTORY | 0777);
 572
 573 #if CONFIG_DIR_INDEX_ENABLE
 574         /* Initialize directory index if supported */
 575         if (ext4_sb_feature_com(&fs->sb, EXT4_FCOM_DIR_INDEX)) {
 576                 r = ext4_dir_dx_init(&root, &root);
 577                 if (r != EOK)
 578                         return r;
 579
 580                 r = ext4_dir_dx_init(&child, &root);
 581                 if (r != EOK)
 582                         return r;
 583
 584                 ext4_inode_set_flag(root.inode, EXT4_INODE_FLAG_INDEX);
 585                 ext4_inode_set_flag(child.inode, EXT4_INODE_FLAG_INDEX);
 586         } else
 587 #endif
 588         {
 589                 r = ext4_dir_add_entry(&root, ".", strlen("."), &root);
 590                 if (r != EOK)
 591                         return r;
 592
 593                 r = ext4_dir_add_entry(&root, "..", strlen(".."), &root);
 594                 if (r != EOK)
 595                         return r;
 596
 597                 r = ext4_dir_add_entry(&child, ".", strlen("."), &child);
 598                 if (r != EOK)
 599                         return r;
 600
 601                 r = ext4_dir_add_entry(&child, "..", strlen(".."), &root);
 602                 if (r != EOK)
 603                         return r;
 604         }
 605
 606         r = ext4_dir_add_entry(&root, "lost+found", strlen("lost+found"), &child);
 607         if (r != EOK)
 608                 return r;
 609
 610         ext4_inode_set_links_cnt(root.inode, 3);
 611         ext4_inode_set_links_cnt(child.inode, 2);
 612
 613         child.dirty = true;
 614         root.dirty = true;
 615         ext4_fs_put_inode_ref(&child);
 616         ext4_fs_put_inode_ref(&root);
 617         return r;
 618 }
 619
 620 int ext4_mkfs(struct ext4_fs *fs, struct ext4_blockdev *bd,
 621               struct ext4_mkfs_info *info, int fs_type)
 622 {
 623         int r;
 624
 625         r = ext4_block_init(bd);
 626         if (r != EOK)
 627                 return r;
 628
 629         if (info->len == 0)
 630                 info->len = bd->ph_bcnt * bd->ph_bsize;
 631
 632         if (info->block_size == 0)
 633                 info->block_size = 4096; /*Set block size to default value*/
 634
 635         /* Round down the filesystem length to be a multiple of the block size */
 636         info->len &= ~((uint64_t)info->block_size - 1);
 637
 638         if (info->journal_blocks == 0)
 639                 info->journal_blocks = compute_journal_blocks(info);
 640
 641         if (info->blocks_per_group == 0)
 642                 info->blocks_per_group = compute_blocks_per_group(info);
 643
 644         if (info->inodes == 0)
 645                 info->inodes = compute_inodes(info);
 646
 647         if (info->inode_size == 0)
 648                 info->inode_size = 256;
 649
 650         if (info->label == NULL)
 651                 info->label = "";
 652
 653         info->inodes_per_group = compute_inodes_per_group(info);
 654
 655         switch (fs_type) {
 656         case F_SET_EXT2:
 657                 info->feat_compat = EXT2_SUPPORTED_FCOM;
 658                 info->feat_ro_compat = EXT2_SUPPORTED_FRO_COM;
 659                 info->feat_incompat = EXT2_SUPPORTED_FINCOM;
 660                 break;
 661         case F_SET_EXT3:
 662                 info->feat_compat = EXT3_SUPPORTED_FCOM;
 663                 info->feat_ro_compat = EXT3_SUPPORTED_FRO_COM;
 664                 info->feat_incompat = EXT3_SUPPORTED_FINCOM;
 665                 break;
 666         case F_SET_EXT4:
 667                 info->feat_compat = EXT4_SUPPORTED_FCOM;
 668                 info->feat_ro_compat = EXT4_SUPPORTED_FRO_COM;
 669                 info->feat_incompat = EXT4_SUPPORTED_FINCOM;
 670                 break;
 671         }
 672
 673         /*TODO: handle this features*/
 674         info->feat_incompat &= ~EXT4_FINCOM_META_BG;
 675         info->feat_incompat &= ~EXT4_FINCOM_FLEX_BG;
 676         info->feat_ro_compat &= ~EXT4_FRO_COM_METADATA_CSUM;
 677
 678         /*TODO: handle journal feature & inode*/
 679         if (info->journal == 0)
 680                 info->feat_compat |= 0;
 681
 682         if (info->dsc_size == 0) {
 683
 684                 if (info->feat_incompat & EXT4_FINCOM_64BIT)
 685                         info->dsc_size = EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE;
 686                 else
 687                         info->dsc_size = EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE;
 688         }
 689
 690         info->bg_desc_reserve_blocks = 0;
 691
 692         ext4_dbg(DEBUG_MKFS, DBG_INFO "Creating filesystem with parameters:\n");
 693         ext4_dbg(DEBUG_MKFS, DBG_NONE "Size: %"PRIu64"\n", info->len);
 694         ext4_dbg(DEBUG_MKFS, DBG_NONE "Block size: %"PRIu32"\n",
 695                         info->block_size);
 696         ext4_dbg(DEBUG_MKFS, DBG_NONE "Blocks per group: %"PRIu32"\n",
 697                         info->blocks_per_group);
 698         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes per group: %"PRIu32"\n",
 699                         info->inodes_per_group);
 700         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inode size: %"PRIu32"\n",
 701                         info->inode_size);
 702         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes: %"PRIu32"\n", info->inodes);
 703         ext4_dbg(DEBUG_MKFS, DBG_NONE "Journal blocks: %"PRIu32"\n",
 704                         info->journal_blocks);
 705         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features ro_compat: 0x%x\n",
 706                         info->feat_ro_compat);
 707         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features compat: 0x%x\n",
 708                         info->feat_compat);
 709         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features incompat: 0x%x\n",
 710                         info->feat_incompat);
 711         ext4_dbg(DEBUG_MKFS, DBG_NONE "BG desc reserve: %"PRIu32"\n",
 712                         info->bg_desc_reserve_blocks);
 713         ext4_dbg(DEBUG_MKFS, DBG_NONE "Descriptor size: %"PRIu16"\n",
 714                         info->dsc_size);
 715         ext4_dbg(DEBUG_MKFS, DBG_NONE "journal: %s\n",
 716                         info->journal ? "yes" : "no");
 717         ext4_dbg(DEBUG_MKFS, DBG_NONE "Label: %s\n", info->label);
 718
 719         struct ext4_bcache bc;
 720         memset(&bc, 0, sizeof(struct ext4_bcache));
 721         ext4_block_set_lb_size(bd, info->block_size);
 722         r = ext4_bcache_init_dynamic(&bc, CONFIG_BLOCK_DEV_CACHE_SIZE,
 723                                       info->block_size);
 724         if (r != EOK)
 725                 goto block_fini;
 726
 727         /*Bind block cache to block device*/
 728         r = ext4_block_bind_bcache(bd, &bc);
 729         if (r != EOK)
 730                 goto cache_fini;
 731
 732         r = ext4_block_cache_write_back(bd, 1);
 733         if (r != EOK)
 734                 goto cache_fini;
 735
 736         r = mkfs_initial(bd, info);
 737         if (r != EOK)
 738                 goto cache_fini;
 739
 740         r = ext4_fs_init(fs, bd);
 741         if (r != EOK)
 742                 goto cache_fini;
 743
 744         r = init_bgs(fs);
 745         if (r != EOK)
 746                 goto fs_fini;
 747
 748         r = alloc_inodes(fs);
 749         if (r != EOK)
 750                 goto fs_fini;
 751
 752         r = create_dirs(fs);
 753         if (r != EOK)
 754                 goto fs_fini;
 755
 756         fs_fini:
 757         ext4_fs_fini(fs);
 758
 759         cache_fini:
 760         ext4_block_cache_write_back(bd, 0);
 761         ext4_bcache_fini_dynamic(&bc);
 762
 763         block_fini:
 764         ext4_block_fini(bd);
 765
 766         return r;
 767 }
 768
 769 /**
 770  * @}
 771  */