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); }
static off_t fat_size(void) { return get_volume_size() / get_cluster_size() * sizeof(cluster_t); }
static off_t cbm_size(void) { return DIV_ROUND_UP( (get_volume_size() - get_position(&cbm)) / get_cluster_size(), CHAR_BIT); }