void ext4_queue_sb(void)
{
/* The write_data* functions expect only block aligned calls.
* This is not an issue, except when we write out the super
* block on a system with a block size > 1K. So, we need to
* deal with that here.
*/
if (info.block_size > 1024) {
u8 *buf = calloc(info.block_size, 1);
memcpy(buf + 1024, (u8*)aux_info.sb, 1024);
sparse_file_add_data(info.sparse_file, buf, info.block_size, 0);
} else {
sparse_file_add_data(info.sparse_file, aux_info.sb, 1024, 1);
}
}
/* Fill in the superblock memory buffer based on the filesystem parameters */
void ext4_fill_in_sb()
{
unsigned int i;
struct ext4_super_block *sb = aux_info.sb;
sb->s_inodes_count = info.inodes_per_group * aux_info.groups;
sb->s_blocks_count_lo = aux_info.len_blocks;
sb->s_r_blocks_count_lo = 0;
sb->s_free_blocks_count_lo = 0;
sb->s_free_inodes_count = 0;
sb->s_first_data_block = aux_info.first_data_block;
sb->s_log_block_size = log_2(info.block_size / 1024);
sb->s_obso_log_frag_size = log_2(info.block_size / 1024);
sb->s_blocks_per_group = info.blocks_per_group;
sb->s_obso_frags_per_group = info.blocks_per_group;
sb->s_inodes_per_group = info.inodes_per_group;
sb->s_mtime = 0;
sb->s_wtime = 0;
sb->s_mnt_count = 0;
sb->s_max_mnt_count = 0xFFFF;
sb->s_magic = EXT4_SUPER_MAGIC;
sb->s_state = EXT4_VALID_FS;
sb->s_errors = EXT4_ERRORS_RO;
sb->s_minor_rev_level = 0;
sb->s_lastcheck = 0;
sb->s_checkinterval = 0;
sb->s_creator_os = EXT4_OS_LINUX;
sb->s_rev_level = EXT4_DYNAMIC_REV;
sb->s_def_resuid = EXT4_DEF_RESUID;
sb->s_def_resgid = EXT4_DEF_RESGID;
sb->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
sb->s_inode_size = info.inode_size;
sb->s_block_group_nr = 0;
sb->s_feature_compat = info.feat_compat;
sb->s_feature_incompat = info.feat_incompat;
sb->s_feature_ro_compat = info.feat_ro_compat;
generate_uuid("extandroid/make_ext4fs", info.label, sb->s_uuid);
memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
strncpy(sb->s_volume_name, info.label, sizeof(sb->s_volume_name));
memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
sb->s_algorithm_usage_bitmap = 0;
sb->s_reserved_gdt_blocks = info.bg_desc_reserve_blocks;
sb->s_prealloc_blocks = 0;
sb->s_prealloc_dir_blocks = 0;
//memcpy(sb->s_journal_uuid, sb->s_uuid, sizeof(sb->s_journal_uuid));
if (info.feat_compat & EXT4_FEATURE_COMPAT_HAS_JOURNAL)
sb->s_journal_inum = EXT4_JOURNAL_INO;
sb->s_journal_dev = 0;
sb->s_last_orphan = 0;
sb->s_hash_seed[0] = 0; /* FIXME */
sb->s_def_hash_version = DX_HASH_TEA;
sb->s_reserved_char_pad = EXT4_JNL_BACKUP_BLOCKS;
sb->s_desc_size = sizeof(struct ext2_group_desc);
sb->s_default_mount_opts = 0; /* FIXME */
sb->s_first_meta_bg = 0;
sb->s_mkfs_time = 0;
//sb->s_jnl_blocks[17]; /* FIXME */
sb->s_blocks_count_hi = aux_info.len_blocks >> 32;
sb->s_r_blocks_count_hi = 0;
sb->s_free_blocks_count_hi = 0;
sb->s_min_extra_isize = sizeof(struct ext4_inode) -
EXT4_GOOD_OLD_INODE_SIZE;
sb->s_want_extra_isize = sizeof(struct ext4_inode) -
EXT4_GOOD_OLD_INODE_SIZE;
sb->s_flags = 0;
sb->s_raid_stride = 0;
sb->s_mmp_interval = 0;
sb->s_mmp_block = 0;
sb->s_raid_stripe_width = 0;
sb->s_log_groups_per_flex = 0;
sb->s_kbytes_written = 0;
for (i = 0; i < aux_info.groups; i++) {
u64 group_start_block = aux_info.first_data_block + i *
info.blocks_per_group;
u32 header_size = 0;
if (ext4_bg_has_super_block(i)) {
if (i != 0) {
aux_info.backup_sb[i] = calloc(info.block_size, 1);
memcpy(aux_info.backup_sb[i], sb, info.block_size);
/* Update the block group nr of this backup superblock */
aux_info.backup_sb[i]->s_block_group_nr = i;
sparse_file_add_data(info.sparse_file, aux_info.backup_sb[i],
info.block_size, group_start_block);
}
sparse_file_add_data(info.sparse_file, aux_info.bg_desc,
aux_info.bg_desc_blocks * info.block_size,
group_start_block + 1);
header_size = 1 + aux_info.bg_desc_blocks + info.bg_desc_reserve_blocks;
}
aux_info.bg_desc[i].bg_block_bitmap = group_start_block + header_size;
aux_info.bg_desc[i].bg_inode_bitmap = group_start_block + header_size + 1;
aux_info.bg_desc[i].bg_inode_table = group_start_block + header_size + 2;
aux_info.bg_desc[i].bg_free_blocks_count = sb->s_blocks_per_group;
aux_info.bg_desc[i].bg_free_inodes_count = sb->s_inodes_per_group;
aux_info.bg_desc[i].bg_used_dirs_count = 0;
}
}
int AddToSparseFile(struct sparse_file* s, int64_t len, unsigned int block) override {
return sparse_file_add_data(s, buf, len, block);
}