static void init_sb(struct exfat_super_block* sb)
{
uint32_t clusters_max;
uint32_t fat_sectors;
clusters_max = get_volume_size() / get_cluster_size();
fat_sectors = DIV_ROUND_UP((loff_t) clusters_max * sizeof(cluster_t),
get_sector_size());
memset(sb, 0, sizeof(struct exfat_super_block));
sb->jump[0] = 0xeb;
sb->jump[1] = 0x76;
sb->jump[2] = 0x90;
memcpy(sb->oem_name, "EXFAT ", sizeof(sb->oem_name));
sb->sector_start = cpu_to_le64(get_first_sector());
sb->sector_count = cpu_to_le64(get_volume_size() / get_sector_size());
sb->fat_sector_start = cpu_to_le32(
fat.get_alignment() / get_sector_size());
sb->fat_sector_count = cpu_to_le32(ROUND_UP(
le32_to_cpu(sb->fat_sector_start) + fat_sectors,
1 << get_spc_bits()) -
le32_to_cpu(sb->fat_sector_start));
sb->cluster_sector_start = cpu_to_le32(
get_position(&cbm) / get_sector_size());
sb->cluster_count = cpu_to_le32(clusters_max -
((le32_to_cpu(sb->fat_sector_start) +
le32_to_cpu(sb->fat_sector_count)) >> get_spc_bits()));
sb->rootdir_cluster = cpu_to_le32(
(get_position(&rootdir) - get_position(&cbm)) / get_cluster_size()
+ EXFAT_FIRST_DATA_CLUSTER);
sb->volume_serial = cpu_to_le32(get_volume_serial());
sb->version.major = 1;
sb->version.minor = 0;
sb->volume_state = cpu_to_le16(0);
sb->sector_bits = get_sector_bits();
sb->spc_bits = get_spc_bits();
sb->fat_count = 1;
sb->drive_no = 0x80;
sb->allocated_percent = 0;
sb->boot_signature = cpu_to_le16(0xaa55);
}
int get_sector_size(void)
{
return 1 << get_sector_bits();
}
