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         memcpy(info->uuid, sb->uuid, UUID_SIZE);
  99
 100         return EOK;
 101 }
 102
 103 static uint32_t compute_blocks_per_group(struct ext4_mkfs_info *info)
 104 {
 105         return info->block_size * 8;
 106 }
 107
 108 static uint32_t compute_inodes(struct ext4_mkfs_info *info)
 109 {
 110         return (uint32_t)EXT4_DIV_ROUND_UP(info->len, info->block_size) / 4;
 111 }
 112
 113 static uint32_t compute_inodes_per_group(struct ext4_mkfs_info *info)
 114 {
 115         uint32_t blocks = (uint32_t)EXT4_DIV_ROUND_UP(info->len, info->block_size);
 116         uint32_t block_groups = EXT4_DIV_ROUND_UP(blocks, info->blocks_per_group);
 117         uint32_t inodes = EXT4_DIV_ROUND_UP(info->inodes, block_groups);
 118         inodes = EXT4_ALIGN(inodes, (info->block_size / info->inode_size));
 119
 120         /* After properly rounding up the number of inodes/group,
 121          * make sure to update the total inodes field in the info struct.
 122          */
 123         info->inodes = inodes * block_groups;
 124
 125         return inodes;
 126 }
 127
 128
 129 static uint32_t compute_journal_blocks(struct ext4_mkfs_info *info)
 130 {
 131         uint32_t journal_blocks = (uint32_t)EXT4_DIV_ROUND_UP(info->len,
 132                                                  info->block_size) / 64;
 133         if (journal_blocks < 1024)
 134                 journal_blocks = 1024;
 135         if (journal_blocks > 32768)
 136                 journal_blocks = 32768;
 137         return journal_blocks;
 138 }
 139
 140 static bool has_superblock(struct ext4_mkfs_info *info, uint32_t bgid)
 141 {
 142         if (!(info->feat_ro_compat & EXT4_FRO_COM_SPARSE_SUPER))
 143                 return true;
 144
 145         return ext4_sb_sparse(bgid);
 146 }
 147
 148 static int create_fs_aux_info(struct fs_aux_info *aux_info,
 149                               struct ext4_mkfs_info *info)
 150 {
 151         aux_info->first_data_block = (info->block_size > 1024) ? 0 : 1;
 152         aux_info->len_blocks = info->len / info->block_size;
 153         aux_info->inode_table_blocks = EXT4_DIV_ROUND_UP(info->inodes_per_group *
 154                         info->inode_size, info->block_size);
 155         aux_info->groups = (uint32_t)EXT4_DIV_ROUND_UP(aux_info->len_blocks -
 156                         aux_info->first_data_block, info->blocks_per_group);
 157         aux_info->blocks_per_ind = info->block_size / sizeof(uint32_t);
 158         aux_info->blocks_per_dind =
 159                         aux_info->blocks_per_ind * aux_info->blocks_per_ind;
 160         aux_info->blocks_per_tind =
 161                         aux_info->blocks_per_dind * aux_info->blocks_per_dind;
 162
 163         aux_info->bg_desc_blocks =
 164                 EXT4_DIV_ROUND_UP(aux_info->groups * info->dsc_size,
 165                         info->block_size);
 166
 167         aux_info->default_i_flags = EXT4_INODE_FLAG_NOATIME;
 168
 169         uint32_t last_group_size = aux_info->len_blocks % info->blocks_per_group;
 170         uint32_t last_header_size = 2 + aux_info->inode_table_blocks;
 171         if (has_superblock(info, aux_info->groups - 1))
 172                 last_header_size += 1 + aux_info->bg_desc_blocks +
 173                         info->bg_desc_reserve_blocks;
 174
 175         if (last_group_size > 0 && last_group_size < last_header_size) {
 176                 aux_info->groups--;
 177                 aux_info->len_blocks -= last_group_size;
 178         }
 179
 180         aux_info->sb = ext4_calloc(1, EXT4_SUPERBLOCK_SIZE);
 181         if (!aux_info->sb)
 182                 return ENOMEM;
 183
 184         aux_info->bg_desc_blk = ext4_calloc(1, info->block_size);
 185         if (!aux_info->bg_desc_blk)
 186                 return ENOMEM;
 187
 188         aux_info->xattrs = NULL;
 189
 190
 191         ext4_dbg(DEBUG_MKFS, DBG_INFO "create_fs_aux_info\n");
 192         ext4_dbg(DEBUG_MKFS, DBG_NONE "first_data_block: %"PRIu32"\n",
 193                         aux_info->first_data_block);
 194         ext4_dbg(DEBUG_MKFS, DBG_NONE "len_blocks: %"PRIu64"\n",
 195                         aux_info->len_blocks);
 196         ext4_dbg(DEBUG_MKFS, DBG_NONE "inode_table_blocks: %"PRIu32"\n",
 197                         aux_info->inode_table_blocks);
 198         ext4_dbg(DEBUG_MKFS, DBG_NONE "groups: %"PRIu32"\n",
 199                         aux_info->groups);
 200         ext4_dbg(DEBUG_MKFS, DBG_NONE "bg_desc_blocks: %"PRIu32"\n",
 201                         aux_info->bg_desc_blocks);
 202         ext4_dbg(DEBUG_MKFS, DBG_NONE "default_i_flags: %"PRIu32"\n",
 203                         aux_info->default_i_flags);
 204         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_ind: %"PRIu32"\n",
 205                         aux_info->blocks_per_ind);
 206         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_dind: %"PRIu32"\n",
 207                         aux_info->blocks_per_dind);
 208         ext4_dbg(DEBUG_MKFS, DBG_NONE "blocks_per_tind: %"PRIu32"\n",
 209                         aux_info->blocks_per_tind);
 210
 211         return EOK;
 212 }
 213
 214 static void release_fs_aux_info(struct fs_aux_info *aux_info)
 215 {
 216         if (aux_info->sb)
 217                 ext4_free(aux_info->sb);
 218         if (aux_info->bg_desc_blk)
 219                 ext4_free(aux_info->bg_desc_blk);
 220 }
 221
 222
 223 /* Fill in the superblock memory buffer based on the filesystem parameters */
 224 static void fill_sb(struct fs_aux_info *aux_info, struct ext4_mkfs_info *info)
 225 {
 226         struct ext4_sblock *sb = aux_info->sb;
 227
 228         sb->inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 229
 230         ext4_sb_set_blocks_cnt(sb, aux_info->len_blocks);
 231         ext4_sb_set_free_blocks_cnt(sb, aux_info->len_blocks);
 232         sb->free_inodes_count = to_le32(info->inodes_per_group * aux_info->groups);
 233
 234         sb->reserved_blocks_count_lo = to_le32(0);
 235         sb->first_data_block = to_le32(aux_info->first_data_block);
 236         sb->log_block_size = to_le32(log_2(info->block_size / 1024));
 237         sb->log_cluster_size = to_le32(log_2(info->block_size / 1024));
 238         sb->blocks_per_group = to_le32(info->blocks_per_group);
 239         sb->frags_per_group = to_le32(info->blocks_per_group);
 240         sb->inodes_per_group = to_le32(info->inodes_per_group);
 241         sb->mount_time = to_le32(0);
 242         sb->write_time = to_le32(0);
 243         sb->mount_count = to_le16(0);
 244         sb->max_mount_count = to_le16(0xFFFF);
 245         sb->magic = to_le16(EXT4_SUPERBLOCK_MAGIC);
 246         sb->state = to_le16(EXT4_SUPERBLOCK_STATE_VALID_FS);
 247         sb->errors = to_le16(EXT4_SUPERBLOCK_ERRORS_RO);
 248         sb->minor_rev_level = to_le16(0);
 249         sb->last_check_time = to_le32(0);
 250         sb->check_interval = to_le32(0);
 251         sb->creator_os = to_le32(EXT4_SUPERBLOCK_OS_LINUX);
 252         sb->rev_level = to_le32(1);
 253         sb->def_resuid = to_le16(0);
 254         sb->def_resgid = to_le16(0);
 255
 256         sb->first_inode = to_le32(EXT4_GOOD_OLD_FIRST_INO);
 257         sb->inode_size = to_le16(info->inode_size);
 258         sb->block_group_index = to_le16(0);
 259
 260         sb->features_compatible = to_le32(info->feat_compat);
 261         sb->features_incompatible = to_le32(info->feat_incompat);
 262         sb->features_read_only = to_le32(info->feat_ro_compat);
 263
 264         memcpy(sb->uuid, info->uuid, UUID_SIZE);
 265
 266         memset(sb->volume_name, 0, sizeof(sb->volume_name));
 267         strncpy(sb->volume_name, info->label, sizeof(sb->volume_name));
 268         memset(sb->last_mounted, 0, sizeof(sb->last_mounted));
 269
 270         sb->algorithm_usage_bitmap = to_le32(0);
 271         sb->s_prealloc_blocks = 0;
 272         sb->s_prealloc_dir_blocks = 0;
 273         sb->s_reserved_gdt_blocks = to_le16(info->bg_desc_reserve_blocks);
 274
 275         if (info->feat_compat & EXT4_FCOM_HAS_JOURNAL)
 276                 sb->journal_inode_number = to_le32(EXT4_JOURNAL_INO);
 277
 278         sb->journal_backup_type = 1;
 279         sb->journal_dev = to_le32(0);
 280         sb->last_orphan = to_le32(0);
 281         sb->hash_seed[0] = to_le32(0x11111111);
 282         sb->hash_seed[1] = to_le32(0x22222222);
 283         sb->hash_seed[2] = to_le32(0x33333333);
 284         sb->hash_seed[3] = to_le32(0x44444444);
 285         sb->default_hash_version = EXT2_HTREE_HALF_MD4;
 286         sb->checksum_type = 1;
 287         sb->desc_size = to_le16(info->dsc_size);
 288         sb->default_mount_opts = to_le32(0);
 289         sb->first_meta_bg = to_le32(0);
 290         sb->mkfs_time = to_le32(0);
 291
 292         sb->reserved_blocks_count_hi = to_le32(0);
 293         sb->min_extra_isize = to_le32(sizeof(struct ext4_inode) -
 294                 EXT4_GOOD_OLD_INODE_SIZE);
 295         sb->want_extra_isize = to_le32(sizeof(struct ext4_inode) -
 296                 EXT4_GOOD_OLD_INODE_SIZE);
 297         sb->flags = to_le32(EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH);
 298 }
 299
 300
 301 static int write_bgroup_block(struct ext4_blockdev *bd,
 302                               struct fs_aux_info *aux_info,
 303                               struct ext4_mkfs_info *info,
 304                               uint32_t blk)
 305 {
 306         int r = EOK;
 307         uint32_t j;
 308         struct ext4_block b;
 309
 310         uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 311
 312         for (j = 0; j < aux_info->groups; j++) {
 313                 uint64_t bg_start_block = aux_info->first_data_block +
 314                                           j * info->blocks_per_group;
 315                 uint32_t blk_off = 0;
 316
 317                 blk_off += aux_info->bg_desc_blocks;
 318                 if (has_superblock(info, j)) {
 319                         bg_start_block++;
 320                         blk_off += info->bg_desc_reserve_blocks;
 321                 }
 322
 323                 uint64_t dsc_blk = bg_start_block + blk;
 324
 325                 r = ext4_block_get_noread(bd, &b, dsc_blk);
 326                 if (r != EOK)
 327                         return r;
 328
 329                 memcpy(b.data, aux_info->bg_desc_blk, block_size);
 330
 331                 ext4_bcache_set_dirty(b.buf);
 332                 r = ext4_block_set(bd, &b);
 333                 if (r != EOK)
 334                         return r;
 335         }
 336
 337         return r;
 338 }
 339
 340 static int write_bgroups(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 341                          struct ext4_mkfs_info *info)
 342 {
 343         int r = EOK;
 344
 345         struct ext4_block b;
 346         struct ext4_bgroup *bg_desc;
 347
 348         uint32_t i;
 349         uint32_t bg_free_blk = 0;
 350         uint64_t sb_free_blk = 0;
 351         uint32_t block_size = ext4_sb_get_block_size(aux_info->sb);
 352         uint32_t dsc_size = ext4_sb_get_desc_size(aux_info->sb);
 353         uint32_t dsc_per_block = block_size / dsc_size;
 354         uint32_t k = 0;
 355
 356         for (i = 0; i < aux_info->groups; i++) {
 357                 uint64_t bg_start_block = aux_info->first_data_block +
 358                         aux_info->first_data_block + i * info->blocks_per_group;
 359                 uint32_t blk_off = 0;
 360
 361                 bg_desc = (void *)(aux_info->bg_desc_blk + k * dsc_size);
 362                 bg_free_blk = info->blocks_per_group -
 363                                 aux_info->inode_table_blocks;
 364
 365                 bg_free_blk -= 2;
 366                 blk_off += aux_info->bg_desc_blocks;
 367
 368                 if (i == (aux_info->groups - 1))
 369                         bg_free_blk -= aux_info->first_data_block;
 370
 371                 if (has_superblock(info, i)) {
 372                         bg_start_block++;
 373                         blk_off += info->bg_desc_reserve_blocks;
 374                         bg_free_blk -= info->bg_desc_reserve_blocks + 1;
 375                         bg_free_blk -= aux_info->bg_desc_blocks;
 376                 }
 377
 378                 ext4_bg_set_block_bitmap(bg_desc, aux_info->sb,
 379                                          bg_start_block + blk_off + 1);
 380
 381                 ext4_bg_set_inode_bitmap(bg_desc, aux_info->sb,
 382                                          bg_start_block + blk_off + 2);
 383
 384                 ext4_bg_set_inode_table_first_block(bg_desc,
 385                                                 aux_info->sb,
 386                                                 bg_start_block + blk_off + 3);
 387
 388                 ext4_bg_set_free_blocks_count(bg_desc, aux_info->sb,
 389                                               bg_free_blk);
 390
 391                 ext4_bg_set_free_inodes_count(bg_desc,
 392                                 aux_info->sb, to_le32(aux_info->sb->inodes_per_group));
 393
 394                 ext4_bg_set_used_dirs_count(bg_desc, aux_info->sb, 0);
 395
 396                 ext4_bg_set_flag(bg_desc,
 397                                  EXT4_BLOCK_GROUP_BLOCK_UNINIT |
 398                                  EXT4_BLOCK_GROUP_INODE_UNINIT);
 399
 400                 sb_free_blk += bg_free_blk;
 401
 402                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 1);
 403                 if (r != EOK)
 404                         return r;
 405                 memset(b.data, 0, block_size);
 406                 ext4_bcache_set_dirty(b.buf);
 407                 r = ext4_block_set(bd, &b);
 408                 if (r != EOK)
 409                         return r;
 410                 r = ext4_block_get_noread(bd, &b, bg_start_block + blk_off + 2);
 411                 if (r != EOK)
 412                         return r;
 413                 memset(b.data, 0, block_size);
 414                 ext4_bcache_set_dirty(b.buf);
 415                 r = ext4_block_set(bd, &b);
 416                 if (r != EOK)
 417                         return r;
 418
 419                 if (++k != dsc_per_block)
 420                         continue;
 421
 422                 k = 0;
 423                 r = write_bgroup_block(bd, aux_info, info, i / dsc_per_block);
 424                 if (r != EOK)
 425                         return r;
 426
 427         }
 428
 429         r = write_bgroup_block(bd, aux_info, info, i / dsc_per_block);
 430         if (r != EOK)
 431                 return r;
 432
 433         ext4_sb_set_free_blocks_cnt(aux_info->sb, sb_free_blk);
 434         return r;
 435 }
 436
 437 static int write_sblocks(struct ext4_blockdev *bd, struct fs_aux_info *aux_info,
 438                           struct ext4_mkfs_info *info)
 439 {
 440         uint64_t offset;
 441         uint32_t i;
 442         int r;
 443
 444         /* write out the backup superblocks */
 445         for (i = 1; i < aux_info->groups; i++) {
 446                 if (has_superblock(info, i)) {
 447                         offset = info->block_size * (aux_info->first_data_block
 448                                 + i * info->blocks_per_group);
 449
 450                         aux_info->sb->block_group_index = to_le16(i);
 451                         r = ext4_block_writebytes(bd, offset, aux_info->sb,
 452                                                   EXT4_SUPERBLOCK_SIZE);
 453                         if (r != EOK)
 454                                 return r;
 455                 }
 456         }
 457
 458         /* write out the primary superblock */
 459         aux_info->sb->block_group_index = to_le16(0);
 460         return ext4_block_writebytes(bd, 1024, aux_info->sb,
 461                         EXT4_SUPERBLOCK_SIZE);
 462 }
 463
 464
 465 int ext4_mkfs_read_info(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 466 {
 467         int r;
 468         struct ext4_sblock *sb = NULL;
 469         r = ext4_block_init(bd);
 470         if (r != EOK)
 471                 return r;
 472
 473         sb = ext4_malloc(EXT4_SUPERBLOCK_SIZE);
 474         if (!sb)
 475                 goto Finish;
 476
 477
 478         r = ext4_sb_read(bd, sb);
 479         if (r != EOK)
 480                 goto Finish;
 481
 482         r = sb2info(sb, info);
 483
 484 Finish:
 485         if (sb)
 486                 ext4_free(sb);
 487         ext4_block_fini(bd);
 488         return r;
 489 }
 490
 491 static int mkfs_init(struct ext4_blockdev *bd, struct ext4_mkfs_info *info)
 492 {
 493         int r;
 494         struct fs_aux_info aux_info;
 495         memset(&aux_info, 0, sizeof(struct fs_aux_info));
 496
 497         r = create_fs_aux_info(&aux_info, info);
 498         if (r != EOK)
 499                 goto Finish;
 500
 501         fill_sb(&aux_info, info);
 502
 503         r = write_bgroups(bd, &aux_info, info);
 504         if (r != EOK)
 505                 goto Finish;
 506
 507         r = write_sblocks(bd, &aux_info, info);
 508         if (r != EOK)
 509                 goto Finish;
 510
 511         Finish:
 512         release_fs_aux_info(&aux_info);
 513         return r;
 514 }
 515
 516 static int init_bgs(struct ext4_fs *fs)
 517 {
 518         int r = EOK;
 519         struct ext4_block_group_ref ref;
 520         uint32_t i;
 521         uint32_t bg_count = ext4_block_group_cnt(&fs->sb);
 522         for (i = 0; i < bg_count; ++i) {
 523                 r = ext4_fs_get_block_group_ref(fs, i, &ref);
 524                 if (r != EOK)
 525                         break;
 526
 527                 r = ext4_fs_put_block_group_ref(&ref);
 528                 if (r != EOK)
 529                         break;
 530         }
 531         return r;
 532 }
 533
 534 static int alloc_inodes(struct ext4_fs *fs)
 535 {
 536         int r = EOK;
 537         int i;
 538         struct ext4_inode_ref inode_ref;
 539         for (i = 1; i < 12; ++i) {
 540                 int filetype = EXT4_DE_REG_FILE;
 541
 542                 switch (i) {
 543                 case EXT4_ROOT_INO:
 544                 case EXT4_GOOD_OLD_FIRST_INO:
 545                         filetype = EXT4_DE_DIR;
 546                         break;
 547                 default:
 548                         break;
 549                 }
 550
 551                 r = ext4_fs_alloc_inode(fs, &inode_ref, filetype);
 552                 if (r != EOK)
 553                         return r;
 554
 555                 ext4_inode_set_mode(&fs->sb, inode_ref.inode, 0);
 556
 557                 switch (i) {
 558                 case EXT4_ROOT_INO:
 559                 case EXT4_JOURNAL_INO:
 560                         ext4_fs_inode_blocks_init(fs, &inode_ref);
 561                         break;
 562                 }
 563
 564                 ext4_fs_put_inode_ref(&inode_ref);
 565         }
 566
 567         return r;
 568 }
 569
 570 static int create_dirs(struct ext4_fs *fs)
 571 {
 572         int r = EOK;
 573         struct ext4_inode_ref root;
 574         struct ext4_inode_ref child;
 575
 576         r = ext4_fs_get_inode_ref(fs, EXT4_ROOT_INO, &root);
 577         if (r != EOK)
 578                 return r;
 579
 580         r = ext4_fs_get_inode_ref(fs, EXT4_GOOD_OLD_FIRST_INO, &child);
 581         if (r != EOK)
 582                 return r;
 583
 584         ext4_inode_set_mode(&fs->sb, child.inode,
 585                         EXT4_INODE_MODE_DIRECTORY | 0777);
 586
 587         ext4_inode_set_mode(&fs->sb, root.inode,
 588                         EXT4_INODE_MODE_DIRECTORY | 0777);
 589
 590 #if CONFIG_DIR_INDEX_ENABLE
 591         /* Initialize directory index if supported */
 592         if (ext4_sb_feature_com(&fs->sb, EXT4_FCOM_DIR_INDEX)) {
 593                 r = ext4_dir_dx_init(&root, &root);
 594                 if (r != EOK)
 595                         return r;
 596
 597                 r = ext4_dir_dx_init(&child, &root);
 598                 if (r != EOK)
 599                         return r;
 600
 601                 ext4_inode_set_flag(root.inode, EXT4_INODE_FLAG_INDEX);
 602                 ext4_inode_set_flag(child.inode, EXT4_INODE_FLAG_INDEX);
 603         } else
 604 #endif
 605         {
 606                 r = ext4_dir_add_entry(&root, ".", strlen("."), &root);
 607                 if (r != EOK)
 608                         return r;
 609
 610                 r = ext4_dir_add_entry(&root, "..", strlen(".."), &root);
 611                 if (r != EOK)
 612                         return r;
 613
 614                 r = ext4_dir_add_entry(&child, ".", strlen("."), &child);
 615                 if (r != EOK)
 616                         return r;
 617
 618                 r = ext4_dir_add_entry(&child, "..", strlen(".."), &root);
 619                 if (r != EOK)
 620                         return r;
 621         }
 622
 623         r = ext4_dir_add_entry(&root, "lost+found", strlen("lost+found"), &child);
 624         if (r != EOK)
 625                 return r;
 626
 627         ext4_inode_set_links_cnt(root.inode, 3);
 628         ext4_inode_set_links_cnt(child.inode, 2);
 629
 630         child.dirty = true;
 631         root.dirty = true;
 632         ext4_fs_put_inode_ref(&child);
 633         ext4_fs_put_inode_ref(&root);
 634         return r;
 635 }
 636
 637 static int create_journal_inode(struct ext4_fs *fs,
 638                                 struct ext4_mkfs_info *info)
 639 {
 640         int ret;
 641         struct ext4_inode_ref inode_ref;
 642         uint64_t blocks_count;
 643
 644         if (!info->journal)
 645                 return EOK;
 646
 647         ret = ext4_fs_get_inode_ref(fs, EXT4_JOURNAL_INO, &inode_ref);
 648         if (ret != EOK)
 649                 return ret;
 650
 651         struct ext4_inode *inode = inode_ref.inode;
 652
 653         ext4_inode_set_mode(&fs->sb, inode, EXT4_INODE_MODE_FILE | 0600);
 654         ext4_inode_set_links_cnt(inode, 1);
 655
 656         blocks_count = ext4_inode_get_blocks_count(&fs->sb, inode);
 657
 658         while (blocks_count++ < info->journal_blocks)
 659         {
 660                 ext4_fsblk_t fblock;
 661                 ext4_lblk_t iblock;
 662                 struct ext4_block blk;
 663
 664                 ret = ext4_fs_append_inode_dblk(&inode_ref, &fblock, &iblock);
 665                 if (ret != EOK)
 666                         goto Finish;
 667
 668                 if (iblock != 0)
 669                         continue;
 670
 671                 ret = ext4_block_get(fs->bdev, &blk, fblock);
 672                 if (ret != EOK)
 673                         goto Finish;
 674
 675
 676                 struct jbd_sb * jbd_sb = (struct jbd_sb * )blk.data;
 677                 memset(jbd_sb, 0, sizeof(struct jbd_sb));
 678
 679                 jbd_sb->header.magic = to_be32(JBD_MAGIC_NUMBER);
 680                 jbd_sb->header.blocktype = to_be32(JBD_SUPERBLOCK_V2);
 681                 jbd_sb->blocksize = to_be32(info->block_size);
 682                 jbd_sb->maxlen = to_be32(info->journal_blocks);
 683                 jbd_sb->nr_users = to_be32(1);
 684                 jbd_sb->first = to_be32(1);
 685                 jbd_sb->sequence = to_be32(1);
 686
 687                 ext4_bcache_set_dirty(blk.buf);
 688                 ret = ext4_block_set(fs->bdev, &blk);
 689                 if (ret != EOK)
 690                         goto Finish;
 691         }
 692
 693         memcpy(fs->sb.journal_blocks, inode->blocks, sizeof(inode->blocks));
 694
 695         Finish:
 696         ext4_fs_put_inode_ref(&inode_ref);
 697
 698         return ret;
 699 }
 700
 701 int ext4_mkfs(struct ext4_fs *fs, struct ext4_blockdev *bd,
 702               struct ext4_mkfs_info *info, int fs_type)
 703 {
 704         int r;
 705
 706         r = ext4_block_init(bd);
 707         if (r != EOK)
 708                 return r;
 709
 710         bd->fs = fs;
 711
 712         if (info->len == 0)
 713                 info->len = bd->bdif->ph_bcnt * bd->bdif->ph_bsize;
 714
 715         if (info->block_size == 0)
 716                 info->block_size = 4096; /*Set block size to default value*/
 717
 718         /* Round down the filesystem length to be a multiple of the block size */
 719         info->len &= ~((uint64_t)info->block_size - 1);
 720
 721         if (info->journal_blocks == 0)
 722                 info->journal_blocks = compute_journal_blocks(info);
 723
 724         if (info->blocks_per_group == 0)
 725                 info->blocks_per_group = compute_blocks_per_group(info);
 726
 727         if (info->inodes == 0)
 728                 info->inodes = compute_inodes(info);
 729
 730         if (info->inode_size == 0)
 731                 info->inode_size = 256;
 732
 733         if (info->label == NULL)
 734                 info->label = "";
 735
 736         info->inodes_per_group = compute_inodes_per_group(info);
 737
 738         switch (fs_type) {
 739         case F_SET_EXT2:
 740                 info->feat_compat = EXT2_SUPPORTED_FCOM;
 741                 info->feat_ro_compat = EXT2_SUPPORTED_FRO_COM;
 742                 info->feat_incompat = EXT2_SUPPORTED_FINCOM;
 743                 break;
 744         case F_SET_EXT3:
 745                 info->feat_compat = EXT3_SUPPORTED_FCOM;
 746                 info->feat_ro_compat = EXT3_SUPPORTED_FRO_COM;
 747                 info->feat_incompat = EXT3_SUPPORTED_FINCOM;
 748                 break;
 749         case F_SET_EXT4:
 750                 info->feat_compat = EXT4_SUPPORTED_FCOM;
 751                 info->feat_ro_compat = EXT4_SUPPORTED_FRO_COM;
 752                 info->feat_incompat = EXT4_SUPPORTED_FINCOM;
 753                 break;
 754         }
 755
 756         /*TODO: handle this features some day...*/
 757         info->feat_incompat &= ~EXT4_FINCOM_META_BG;
 758         info->feat_incompat &= ~EXT4_FINCOM_FLEX_BG;
 759         info->feat_incompat &= ~EXT4_FINCOM_64BIT;
 760
 761         info->feat_ro_compat &= ~EXT4_FRO_COM_METADATA_CSUM;
 762         info->feat_ro_compat &= ~EXT4_FRO_COM_GDT_CSUM;
 763         info->feat_ro_compat &= ~EXT4_FRO_COM_DIR_NLINK;
 764         info->feat_ro_compat &= ~EXT4_FRO_COM_EXTRA_ISIZE;
 765         info->feat_ro_compat &= ~EXT4_FRO_COM_HUGE_FILE;
 766
 767         if (info->journal)
 768                 info->feat_compat |= EXT4_FCOM_HAS_JOURNAL;
 769
 770         if (info->dsc_size == 0) {
 771
 772                 if (info->feat_incompat & EXT4_FINCOM_64BIT)
 773                         info->dsc_size = EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE;
 774                 else
 775                         info->dsc_size = EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE;
 776         }
 777
 778         info->bg_desc_reserve_blocks = 0;
 779
 780         ext4_dbg(DEBUG_MKFS, DBG_INFO "Creating filesystem with parameters:\n");
 781         ext4_dbg(DEBUG_MKFS, DBG_NONE "Size: %"PRIu64"\n", info->len);
 782         ext4_dbg(DEBUG_MKFS, DBG_NONE "Block size: %"PRIu32"\n",
 783                         info->block_size);
 784         ext4_dbg(DEBUG_MKFS, DBG_NONE "Blocks per group: %"PRIu32"\n",
 785                         info->blocks_per_group);
 786         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes per group: %"PRIu32"\n",
 787                         info->inodes_per_group);
 788         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inode size: %"PRIu32"\n",
 789                         info->inode_size);
 790         ext4_dbg(DEBUG_MKFS, DBG_NONE "Inodes: %"PRIu32"\n", info->inodes);
 791         ext4_dbg(DEBUG_MKFS, DBG_NONE "Journal blocks: %"PRIu32"\n",
 792                         info->journal_blocks);
 793         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features ro_compat: 0x%x\n",
 794                         info->feat_ro_compat);
 795         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features compat: 0x%x\n",
 796                         info->feat_compat);
 797         ext4_dbg(DEBUG_MKFS, DBG_NONE "Features incompat: 0x%x\n",
 798                         info->feat_incompat);
 799         ext4_dbg(DEBUG_MKFS, DBG_NONE "BG desc reserve: %"PRIu32"\n",
 800                         info->bg_desc_reserve_blocks);
 801         ext4_dbg(DEBUG_MKFS, DBG_NONE "Descriptor size: %"PRIu16"\n",
 802                         info->dsc_size);
 803         ext4_dbg(DEBUG_MKFS, DBG_NONE "journal: %s\n",
 804                         info->journal ? "yes" : "no");
 805         ext4_dbg(DEBUG_MKFS, DBG_NONE "Label: %s\n", info->label);
 806
 807         struct ext4_bcache bc;
 808
 809         memset(&bc, 0, sizeof(struct ext4_bcache));
 810         ext4_block_set_lb_size(bd, info->block_size);
 811
 812         r = ext4_bcache_init_dynamic(&bc, CONFIG_BLOCK_DEV_CACHE_SIZE,
 813                                       info->block_size);
 814         if (r != EOK)
 815                 goto block_fini;
 816
 817         /*Bind block cache to block device*/
 818         r = ext4_block_bind_bcache(bd, &bc);
 819         if (r != EOK)
 820                 goto cache_fini;
 821
 822         r = ext4_block_cache_write_back(bd, 1);
 823         if (r != EOK)
 824                 goto cache_fini;
 825
 826         r = mkfs_init(bd, info);
 827         if (r != EOK)
 828                 goto cache_fini;
 829
 830         r = ext4_fs_init(fs, bd, false);
 831         if (r != EOK)
 832                 goto cache_fini;
 833
 834         r = init_bgs(fs);
 835         if (r != EOK)
 836                 goto fs_fini;
 837
 838         r = alloc_inodes(fs);
 839         if (r != EOK)
 840                 goto fs_fini;
 841
 842         r = create_dirs(fs);
 843         if (r != EOK)
 844                 goto fs_fini;
 845
 846         r = create_journal_inode(fs, info);
 847         if (r != EOK)
 848                 goto fs_fini;
 849
 850         fs_fini:
 851         ext4_fs_fini(fs);
 852
 853         cache_fini:
 854         ext4_block_cache_write_back(bd, 0);
 855         ext4_bcache_fini_dynamic(&bc);
 856
 857         block_fini:
 858         ext4_block_fini(bd);
 859
 860         return r;
 861 }
 862
 863 /**
 864  * @}
 865  */