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         uint8_t *bg_desc_blk;
  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 = ext4_calloc(1, EXT4_SUPERBLOCK_SIZE);
 180         if (!aux_info->sb)
 181                 return ENOMEM;
 182
 183         aux_info->bg_desc_blk = ext4_calloc(1, info->block_size);
 184         if (!aux_info->bg_desc_blk)
 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                 ext4_free(aux_info->sb);
 217         if (aux_info->bg_desc_blk)
 218                 ext4_free(aux_info->bg_desc_blk);
 219 }
 220
 221
 222 /* Fill in the superblock memory buffer based on the filesystem parameters */
 223 static void fill_sb(struct fs_aux_info *aux_info, struct ext4_mkfs_info *info)
 224 {
 225         struct ext4_sblock *sb = aux_info->sb;
 226
 227         sb->inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 228
 229         ext4_sb_set_blocks_cnt(sb, aux_info->len_blocks);
 230         ext4_sb_set_free_blocks_cnt(sb, aux_info->len_blocks);
 231         sb->free_inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 232
 233         sb->reserved_blocks_count_lo = to_le32(0);
 234         sb->first_data_block = to_le32(aux_info->first_data_block);
 235         sb->log_block_size = to_le32(log_2(info->block_size / 1024));
 236         sb->log_cluster_size = to_le32(log_2(info->block_size / 1024));
 237         sb->blocks_per_group = to_le32(info->blocks_per_group);
 238         sb->frags_per_group = to_le32(info->blocks_per_group);
 239         sb->inodes_per_group = to_le32(info->inodes_per_group);
 240         sb->mount_time = to_le32(0);
 241         sb->write_time = to_le32(0);
 242         sb->mount_count = to_le16(0);
 243         sb->max_mount_count = to_le16(0xFFFF);
 244         sb->magic = to_le16(EXT4_SUPERBLOCK_MAGIC);
 245         sb->state = to_le16(EXT4_SUPERBLOCK_STATE_VALID_FS);
 246         sb->errors = to_le16(EXT4_SUPERBLOCK_ERRORS_RO);
 247         sb->minor_rev_level = to_le16(0);
 248         sb->last_check_time = to_le32(0);
 249         sb->check_interval = to_le32(0);
 250         sb->creator_os = to_le32(EXT4_SUPERBLOCK_OS_LINUX);
 251         sb->rev_level = to_le32(1);
 252         sb->def_resuid = to_le16(0);
 253         sb->def_resgid = to_le16(0);
 254
 255         sb->first_inode = to_le32(EXT4_GOOD_OLD_FIRST_INO);
 256         sb->inode_size = to_le16(info->inode_size);
 257         sb->block_group_index = to_le16(0);
 258
 259         sb->features_compatible = to_le32(info->feat_compat);
 260         sb->features_incompatible = to_le32(info->feat_incompat);
 261         sb->features_read_only = to_le32(info->feat_ro_compat);
 262
 263         memset(sb->uuid, 0, sizeof(sb->uuid));
 264
 265         memset(sb->volume_name, 0, sizeof(sb->volume_name));
 266         strncpy(sb->volume_name, info->label, sizeof(sb->volume_name));
 267         memset(sb->last_mounted, 0, sizeof(sb->last_mounted));
 268
 269         sb->algorithm_usage_bitmap = to_le32(0);
 270         sb->s_prealloc_blocks = 0;
 271         sb->s_prealloc_dir_blocks = 0;
 272         sb->s_reserved_gdt_blocks = to_le16(info->bg_desc_reserve_blocks);
 273
 274         if (info->feat_compat & EXT4_FCOM_HAS_JOURNAL)
 275                 sb->journal_inode_number = to_le32(EXT4_JOURNAL_INO);
 276         sb->journal_dev = to_le32(0);
 277         sb->last_orphan = to_le32(0);
 278         sb->hash_seed[0] = to_le32(0x11111111);
 279         sb->hash_seed[1] = to_le32(0x22222222);
 280         sb->hash_seed[2] = to_le32(0x33333333);
 281         sb->hash_seed[3] = to_le32(0x44444444);
 282         sb->default_hash_version = EXT2_HTREE_HALF_MD4;
 283         sb->checksum_type = 1;
 284         sb->desc_size = to_le16(info->dsc_size);
 285         sb->default_mount_opts = to_le32(0);
 286         sb->first_meta_bg = to_le32(0);
 287         sb->mkfs_time = to_le32(0);
 288
 289         sb->reserved_blocks_count_hi = to_le32(0);
 290         sb->min_extra_isize = to_le32(sizeof(struct ext4_inode) -
 291                 EXT4_GOOD_OLD_INODE_SIZE);
 292         sb->want_extra_isize = to_le32(sizeof(struct ext4_inode) -
 293                 EXT4_GOOD_OLD_INODE_SIZE);
 294         sb->flags = to_le32(EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH);
 295 }
 296
 297
 298 static int write_bgroup_block(struct ext4_blockdev *bd,
 299                               struct fs_aux_info *aux_info,
 300                               struct ext4_mkfs_info *info,
 301                               uint32_t blk)
 302 {
 303         int r = EOK;
 304         uint32_t j;
 305         struct ext4_block b;
 306
 307         uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 308
 309         for (j = 0; j < aux_info->groups; j++) {
 310                 uint64_t bg_start_block = aux_info->first_data_block +
 311                                           j * info->blocks_per_group;
 312                 uint32_t blk_off = 0;
 313
 314                 blk_off += aux_info->bg_desc_blocks;
 315                 if (has_superblock(info, j)) {
 316                         bg_start_block++;
 317                         blk_off += info->bg_desc_reserve_blocks;
 318                 }
 319
 320                 uint64_t dsc_blk = bg_start_block + blk;
 321
 322                 r = ext4_block_get_noread(bd, &b, dsc_blk);
 323                 if (r != EOK)
 324                         return r;
 325
 326                 memcpy(b.data, aux_info->bg_desc_blk, block_size);
 327
 328                 ext4_bcache_set_dirty(b.buf);
 329                 r = ext4_block_set(bd, &b);
 330                 if (r != EOK)
 331                         return r;
 332         }
 333
 334         return r;
 335 }
 336
 337 static int write_bgroups(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 338                          struct ext4_mkfs_info *info)
 339 {
 340         int r = EOK;
 341
 342         struct ext4_block b;
 343         struct ext4_bgroup *bg_desc;
 344
 345         uint32_t i;
 346         uint32_t bg_free_blk = 0;
 347         uint64_t sb_free_blk = 0;
 348         uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 349         uint32_t dsc_size = ext4_sb_get_desc_size(aux_info->sb);
 350         uint32_t dsc_per_block = block_size / dsc_size;
 351         uint32_t k = 0;
 352
 353         for (i = 0; i < aux_info->groups; i++) {
 354                 uint64_t bg_start_block = aux_info->first_data_block +
 355                         aux_info->first_data_block + i * info->blocks_per_group;
 356                 uint32_t blk_off = 0;
 357
 358                 bg_desc = (void *)(aux_info->bg_desc_blk + k * dsc_size);
 359                 bg_free_blk = info->blocks_per_group -
 360                                 aux_info->inode_table_blocks;
 361
 362                 bg_free_blk -= 2;
 363                 blk_off += aux_info->bg_desc_blocks;
 364
 365                 if (i == (aux_info->groups - 1))
 366                         bg_free_blk -= aux_info->first_data_block;
 367
 368                 if (has_superblock(info, i)) {
 369                         bg_start_block++;
 370                         blk_off += info->bg_desc_reserve_blocks;
 371                         bg_free_blk -= info->bg_desc_reserve_blocks + 1;
 372                         bg_free_blk -= aux_info->bg_desc_blocks;
 373                 }
 374
 375                 ext4_bg_set_block_bitmap(bg_desc, aux_info->sb,
 376                                          bg_start_block + blk_off + 1);
 377
 378                 ext4_bg_set_inode_bitmap(bg_desc, aux_info->sb,
 379                                          bg_start_block + blk_off + 2);
 380
 381                 ext4_bg_set_inode_table_first_block(bg_desc,
 382                                                 aux_info->sb,
 383                                                 bg_start_block + blk_off + 3);
 384
 385                 ext4_bg_set_free_blocks_count(bg_desc, aux_info->sb,
 386                                               bg_free_blk);
 387
 388                 ext4_bg_set_free_inodes_count(bg_desc,
 389                                 aux_info->sb, aux_info->sb->inodes_per_group);
 390
 391                 ext4_bg_set_used_dirs_count(bg_desc, aux_info->sb, 0);
 392
 393                 ext4_bg_set_flag(bg_desc,
 394                                  EXT4_BLOCK_GROUP_BLOCK_UNINIT |
 395                                  EXT4_BLOCK_GROUP_INODE_UNINIT);
 396
 397                 sb_free_blk += bg_free_blk;
 398
 399                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 1);
 400                 if (r != EOK)
 401                         return r;
 402                 memset(b.data, 0, block_size);
 403                 ext4_bcache_set_dirty(b.buf);
 404                 r = ext4_block_set(bd, &b);
 405                 if (r != EOK)
 406                         return r;
 407                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 2);
 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
 416                 if (++k != dsc_per_block)
 417                         continue;
 418
 419                 k = 0;
 420                 r = write_bgroup_block(bd, aux_info, info, i / dsc_per_block);
 421                 if (r != EOK)
 422                         return r;
 423
 424         }
 425
 426         r = write_bgroup_block(bd, aux_info, info, i / dsc_per_block);
 427         if (r != EOK)
 428                 return r;
 429
 430         ext4_sb_set_free_blocks_cnt(aux_info->sb, sb_free_blk);
 431         return r;
 432 }
 433
 434 static int write_sblocks(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 435                           struct ext4_mkfs_info *info)
 436 {
 437         uint64_t offset;
 438         uint32_t i;
 439         int r;
 440
 441         /* write out the backup superblocks */
 442         for (i = 1; i < aux_info->groups; i++) {
 443                 if (has_superblock(info, i)) {
 444                         offset = info->block_size * (aux_info->first_data_block
 445                                 + i * info->blocks_per_group);
 446
 447                         aux_info->sb->block_group_index = to_le16(i);
 448                         r = ext4_block_writebytes(bd, offset, aux_info->sb,
 449                                                   EXT4_SUPERBLOCK_SIZE);
 450                         if (r != EOK)
 451                                 return r;
 452                 }
 453         }
 454
 455         /* write out the primary superblock */
 456         aux_info->sb->block_group_index = to_le16(0);
 457         return ext4_block_writebytes(bd, 1024, aux_info->sb,
 458                         EXT4_SUPERBLOCK_SIZE);
 459 }
 460
 461
 462 int ext4_mkfs_read_info(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 463 {
 464         int r;
 465         struct ext4_sblock *sb = NULL;
 466         r = ext4_block_init(bd);
 467         if (r != EOK)
 468                 return r;
 469
 470         sb = ext4_malloc(EXT4_SUPERBLOCK_SIZE);
 471         if (!sb)
 472                 goto Finish;
 473
 474
 475         r = ext4_sb_read(bd, sb);
 476         if (r != EOK)
 477                 goto Finish;
 478
 479         r = sb2info(sb, info);
 480
 481 Finish:
 482         if (sb)
 483                 ext4_free(sb);
 484         ext4_block_fini(bd);
 485         return r;
 486 }
 487
 488 static int mkfs_init(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 489 {
 490         int r;
 491         struct fs_aux_info aux_info;
 492         memset(&aux_info, 0, sizeof(struct fs_aux_info));
 493
 494         r = create_fs_aux_info(&aux_info, info);
 495         if (r != EOK)
 496                 goto Finish;
 497
 498         fill_sb(&aux_info, info);
 499
 500         r = write_bgroups(bd, &aux_info, info);
 501         if (r != EOK)
 502                 goto Finish;
 503
 504         r = write_sblocks(bd, &aux_info, info);
 505         if (r != EOK)
 506                 goto Finish;
 507
 508         Finish:
 509         release_fs_aux_info(&aux_info);
 510         return r;
 511 }
 512
 513 static int init_bgs(struct ext4_fs *fs)
 514 {
 515         int r = EOK;
 516         struct ext4_block_group_ref ref;
 517         uint32_t i;
 518         uint32_t bg_count = ext4_block_group_cnt(&fs->sb);
 519         for (i = 0; i < bg_count; ++i) {
 520                 r = ext4_fs_get_block_group_ref(fs, i, &ref);
 521                 if (r != EOK)
 522                         break;
 523
 524                 r = ext4_fs_put_block_group_ref(&ref);
 525                 if (r != EOK)
 526                         break;
 527         }
 528         return r;
 529 }
 530
 531 static int alloc_inodes(struct ext4_fs *fs)
 532 {
 533         int r = EOK;
 534         int i;
 535         struct ext4_inode_ref inode_ref;
 536         for (i = 1; i < 12; ++i) {
 537                 int filetype = EXT4_DE_REG_FILE;
 538
 539                 switch (i) {
 540                 case EXT4_ROOT_INO:
 541                 case EXT4_GOOD_OLD_FIRST_INO:
 542                         filetype = EXT4_DE_DIR;
 543                         break;
 544                 }
 545
 546                 r = ext4_fs_alloc_inode(fs, &inode_ref, filetype);
 547                 if (r != EOK)
 548                         return r;
 549
 550                 ext4_inode_set_mode(&fs->sb, inode_ref.inode, 0);
 551                 ext4_fs_put_inode_ref(&inode_ref);
 552         }
 553
 554         return r;
 555 }
 556
 557 static int create_dirs(struct ext4_fs *fs)
 558 {
 559         int r = EOK;
 560         struct ext4_inode_ref root;
 561         struct ext4_inode_ref child;
 562
 563         r = ext4_fs_get_inode_ref(fs, EXT4_ROOT_INO, &root);
 564         if (r != EOK)
 565                 return r;
 566
 567         r = ext4_fs_get_inode_ref(fs, EXT4_GOOD_OLD_FIRST_INO, &child);
 568         if (r != EOK)
 569                 return r;
 570
 571         ext4_inode_set_mode(&fs->sb, child.inode,
 572                         EXT4_INODE_MODE_DIRECTORY | 0777);
 573
 574         ext4_inode_set_mode(&fs->sb, root.inode,
 575                         EXT4_INODE_MODE_DIRECTORY | 0777);
 576
 577 #if CONFIG_DIR_INDEX_ENABLE
 578         /* Initialize directory index if supported */
 579         if (ext4_sb_feature_com(&fs->sb, EXT4_FCOM_DIR_INDEX)) {
 580                 r = ext4_dir_dx_init(&root, &root);
 581                 if (r != EOK)
 582                         return r;
 583
 584                 r = ext4_dir_dx_init(&child, &root);
 585                 if (r != EOK)
 586                         return r;
 587
 588                 ext4_inode_set_flag(root.inode, EXT4_INODE_FLAG_INDEX);
 589                 ext4_inode_set_flag(child.inode, EXT4_INODE_FLAG_INDEX);
 590         } else
 591 #endif
 592         {
 593                 r = ext4_dir_add_entry(&root, ".", strlen("."), &root);
 594                 if (r != EOK)
 595                         return r;
 596
 597                 r = ext4_dir_add_entry(&root, "..", strlen(".."), &root);
 598                 if (r != EOK)
 599                         return r;
 600
 601                 r = ext4_dir_add_entry(&child, ".", strlen("."), &child);
 602                 if (r != EOK)
 603                         return r;
 604
 605                 r = ext4_dir_add_entry(&child, "..", strlen(".."), &root);
 606                 if (r != EOK)
 607                         return r;
 608         }
 609
 610         r = ext4_dir_add_entry(&root, "lost+found", strlen("lost+found"), &child);
 611         if (r != EOK)
 612                 return r;
 613
 614         ext4_inode_set_links_cnt(root.inode, 3);
 615         ext4_inode_set_links_cnt(child.inode, 2);
 616
 617         child.dirty = true;
 618         root.dirty = true;
 619         ext4_fs_put_inode_ref(&child);
 620         ext4_fs_put_inode_ref(&root);
 621         return r;
 622 }
 623
 624 int ext4_mkfs(struct ext4_fs *fs, struct ext4_blockdev *bd,
 625               struct ext4_mkfs_info *info, int fs_type)
 626 {
 627         int r;
 628
 629         r = ext4_block_init(bd);
 630         if (r != EOK)
 631                 return r;
 632
 633         bd->fs = fs;
 634
 635         if (info->len == 0)
 636                 info->len = bd->bdif->ph_bcnt * bd->bdif->ph_bsize;
 637
 638         if (info->block_size == 0)
 639                 info->block_size = 4096; /*Set block size to default value*/
 640
 641         /* Round down the filesystem length to be a multiple of the block size */
 642         info->len &= ~((uint64_t)info->block_size - 1);
 643
 644         if (info->journal_blocks == 0)
 645                 info->journal_blocks = compute_journal_blocks(info);
 646
 647         if (info->blocks_per_group == 0)
 648                 info->blocks_per_group = compute_blocks_per_group(info);
 649
 650         if (info->inodes == 0)
 651                 info->inodes = compute_inodes(info);
 652
 653         if (info->inode_size == 0)
 654                 info->inode_size = 256;
 655
 656         if (info->label == NULL)
 657                 info->label = "";
 658
 659         info->inodes_per_group = compute_inodes_per_group(info);
 660
 661         switch (fs_type) {
 662         case F_SET_EXT2:
 663                 info->feat_compat = EXT2_SUPPORTED_FCOM;
 664                 info->feat_ro_compat = EXT2_SUPPORTED_FRO_COM;
 665                 info->feat_incompat = EXT2_SUPPORTED_FINCOM;
 666                 break;
 667         case F_SET_EXT3:
 668                 info->feat_compat = EXT3_SUPPORTED_FCOM;
 669                 info->feat_ro_compat = EXT3_SUPPORTED_FRO_COM;
 670                 info->feat_incompat = EXT3_SUPPORTED_FINCOM;
 671                 break;
 672         case F_SET_EXT4:
 673                 info->feat_compat = EXT4_SUPPORTED_FCOM;
 674                 info->feat_ro_compat = EXT4_SUPPORTED_FRO_COM;
 675                 info->feat_incompat = EXT4_SUPPORTED_FINCOM;
 676                 break;
 677         }
 678
 679         /*TODO: handle this features*/
 680         info->feat_incompat &= ~EXT4_FINCOM_META_BG;
 681         info->feat_incompat &= ~EXT4_FINCOM_FLEX_BG;
 682         info->feat_ro_compat &= ~EXT4_FRO_COM_METADATA_CSUM;
 683
 684         /*TODO: handle journal feature & inode*/
 685         if (info->journal == 0)
 686                 info->feat_compat |= 0;
 687
 688         if (info->dsc_size == 0) {
 689
 690                 if (info->feat_incompat & EXT4_FINCOM_64BIT)
 691                         info->dsc_size = EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE;
 692                 else
 693                         info->dsc_size = EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE;
 694         }
 695
 696         info->bg_desc_reserve_blocks = 0;
 697
 698         ext4_dbg(DEBUG_MKFS, DBG_INFO "Creating filesystem with parameters:\n");
 699         ext4_dbg(DEBUG_MKFS, DBG_NONE "Size: %"PRIu64"\n", info->len);
 700         ext4_dbg(DEBUG_MKFS, DBG_NONE "Block size: %"PRIu32"\n",
 701                         info->block_size);
 702         ext4_dbg(DEBUG_MKFS, DBG_NONE "Blocks per group: %"PRIu32"\n",
 703                         info->blocks_per_group);
 704         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes per group: %"PRIu32"\n",
 705                         info->inodes_per_group);
 706         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inode size: %"PRIu32"\n",
 707                         info->inode_size);
 708         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes: %"PRIu32"\n", info->inodes);
 709         ext4_dbg(DEBUG_MKFS, DBG_NONE "Journal blocks: %"PRIu32"\n",
 710                         info->journal_blocks);
 711         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features ro_compat: 0x%x\n",
 712                         info->feat_ro_compat);
 713         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features compat: 0x%x\n",
 714                         info->feat_compat);
 715         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features incompat: 0x%x\n",
 716                         info->feat_incompat);
 717         ext4_dbg(DEBUG_MKFS, DBG_NONE "BG desc reserve: %"PRIu32"\n",
 718                         info->bg_desc_reserve_blocks);
 719         ext4_dbg(DEBUG_MKFS, DBG_NONE "Descriptor size: %"PRIu16"\n",
 720                         info->dsc_size);
 721         ext4_dbg(DEBUG_MKFS, DBG_NONE "journal: %s\n",
 722                         info->journal ? "yes" : "no");
 723         ext4_dbg(DEBUG_MKFS, DBG_NONE "Label: %s\n", info->label);
 724
 725         struct ext4_bcache bc;
 726         memset(&bc, 0, sizeof(struct ext4_bcache));
 727         ext4_block_set_lb_size(bd, info->block_size);
 728         r = ext4_bcache_init_dynamic(&bc, CONFIG_BLOCK_DEV_CACHE_SIZE,
 729                                       info->block_size);
 730         if (r != EOK)
 731                 goto block_fini;
 732
 733         /*Bind block cache to block device*/
 734         r = ext4_block_bind_bcache(bd, &bc);
 735         if (r != EOK)
 736                 goto cache_fini;
 737
 738         r = ext4_block_cache_write_back(bd, 1);
 739         if (r != EOK)
 740                 goto cache_fini;
 741
 742         r = mkfs_init(bd, info);
 743         if (r != EOK)
 744                 goto cache_fini;
 745
 746         r = ext4_fs_init(fs, bd, false);
 747         if (r != EOK)
 748                 goto cache_fini;
 749
 750         r = init_bgs(fs);
 751         if (r != EOK)
 752                 goto fs_fini;
 753
 754         r = alloc_inodes(fs);
 755         if (r != EOK)
 756                 goto fs_fini;
 757
 758         r = create_dirs(fs);
 759         if (r != EOK)
 760                 goto fs_fini;
 761
 762         fs_fini:
 763         ext4_fs_fini(fs);
 764
 765         cache_fini:
 766         ext4_block_cache_write_back(bd, 0);
 767         ext4_bcache_fini_dynamic(&bc);
 768
 769         block_fini:
 770         ext4_block_fini(bd);
 771
 772         return r;
 773 }
 774
 775 /**
 776  * @}
 777  */