website-struct

Struct: ext4_super_block

Status

Regular

• In 4.4: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __le32 s_reserved[98];
      __le32 s_checksum;
  };
  

• In 4.8: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __le32 s_reserved[98];
      __le32 s_checksum;
  };
  

• In 4.10: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __le32 s_reserved[98];
      __le32 s_checksum;
  };
  

• In 4.13: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __le32 s_reserved[98];
      __le32 s_checksum;
  };
  

• In 4.15: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __le32 s_reserved[98];
      __le32 s_checksum;
  };
  

• In 4.18: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __le32 s_reserved[98];
      __le32 s_checksum;
  };
  

• In 5.0: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le32 s_reserved[96];
      __le32 s_checksum;
  };
  

• In 5.3: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In 5.4: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In 5.8: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In 5.11: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In 5.13: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In 5.15: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_orphan_file_inum;
      __le32 s_reserved[94];
      __le32 s_checksum;
  };
  

• In 5.19: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_orphan_file_inum;
      __le32 s_reserved[94];
      __le32 s_checksum;
  };
  

• In 6.2: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_orphan_file_inum;
      __le32 s_reserved[94];
      __le32 s_checksum;
  };
  

• In 6.5: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_orphan_file_inum;
      __le32 s_reserved[94];
      __le32 s_checksum;
  };
  

• In 6.8: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_first_error_errcode;
      __u8 s_last_error_errcode;
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_orphan_file_inum;
      __le32 s_reserved[94];
      __le32 s_checksum;
  };
  

Arch

• In arm64: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In armhf: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In ppc64el: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In riscv64: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

Flavor

• In aws: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In azure: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In gcp: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

• In lowlatency: ✅

  struct ext4_super_block {
      __le32 s_inodes_count;
      __le32 s_blocks_count_lo;
      __le32 s_r_blocks_count_lo;
      __le32 s_free_blocks_count_lo;
      __le32 s_free_inodes_count;
      __le32 s_first_data_block;
      __le32 s_log_block_size;
      __le32 s_log_cluster_size;
      __le32 s_blocks_per_group;
      __le32 s_clusters_per_group;
      __le32 s_inodes_per_group;
      __le32 s_mtime;
      __le32 s_wtime;
      __le16 s_mnt_count;
      __le16 s_max_mnt_count;
      __le16 s_magic;
      __le16 s_state;
      __le16 s_errors;
      __le16 s_minor_rev_level;
      __le32 s_lastcheck;
      __le32 s_checkinterval;
      __le32 s_creator_os;
      __le32 s_rev_level;
      __le16 s_def_resuid;
      __le16 s_def_resgid;
      __le32 s_first_ino;
      __le16 s_inode_size;
      __le16 s_block_group_nr;
      __le32 s_feature_compat;
      __le32 s_feature_incompat;
      __le32 s_feature_ro_compat;
      __u8 s_uuid[16];
      char s_volume_name[16];
      char s_last_mounted[64];
      __le32 s_algorithm_usage_bitmap;
      __u8 s_prealloc_blocks;
      __u8 s_prealloc_dir_blocks;
      __le16 s_reserved_gdt_blocks;
      __u8 s_journal_uuid[16];
      __le32 s_journal_inum;
      __le32 s_journal_dev;
      __le32 s_last_orphan;
      __le32 s_hash_seed[4];
      __u8 s_def_hash_version;
      __u8 s_jnl_backup_type;
      __le16 s_desc_size;
      __le32 s_default_mount_opts;
      __le32 s_first_meta_bg;
      __le32 s_mkfs_time;
      __le32 s_jnl_blocks[17];
      __le32 s_blocks_count_hi;
      __le32 s_r_blocks_count_hi;
      __le32 s_free_blocks_count_hi;
      __le16 s_min_extra_isize;
      __le16 s_want_extra_isize;
      __le32 s_flags;
      __le16 s_raid_stride;
      __le16 s_mmp_update_interval;
      __le64 s_mmp_block;
      __le32 s_raid_stripe_width;
      __u8 s_log_groups_per_flex;
      __u8 s_checksum_type;
      __u8 s_encryption_level;
      __u8 s_reserved_pad;
      __le64 s_kbytes_written;
      __le32 s_snapshot_inum;
      __le32 s_snapshot_id;
      __le64 s_snapshot_r_blocks_count;
      __le32 s_snapshot_list;
      __le32 s_error_count;
      __le32 s_first_error_time;
      __le32 s_first_error_ino;
      __le64 s_first_error_block;
      __u8 s_first_error_func[32];
      __le32 s_first_error_line;
      __le32 s_last_error_time;
      __le32 s_last_error_ino;
      __le32 s_last_error_line;
      __le64 s_last_error_block;
      __u8 s_last_error_func[32];
      __u8 s_mount_opts[64];
      __le32 s_usr_quota_inum;
      __le32 s_grp_quota_inum;
      __le32 s_overhead_clusters;
      __le32 s_backup_bgs[2];
      __u8 s_encrypt_algos[4];
      __u8 s_encrypt_pw_salt[16];
      __le32 s_lpf_ino;
      __le32 s_prj_quota_inum;
      __le32 s_checksum_seed;
      __u8 s_wtime_hi;
      __u8 s_mtime_hi;
      __u8 s_mkfs_time_hi;
      __u8 s_lastcheck_hi;
      __u8 s_first_error_time_hi;
      __u8 s_last_error_time_hi;
      __u8 s_pad[2];
      __le16 s_encoding;
      __le16 s_encoding_flags;
      __le32 s_reserved[95];
      __le32 s_checksum;
  };
  

Differences

Regular

• No changes between 4.4 and 4.8 ✅
• No changes between 4.8 and 4.10 ✅
• No changes between 4.10 and 4.13 ✅
• No changes between 4.13 and 4.15 ✅
• No changes between 4.15 and 4.18 ✅
• Changed between 4.18 and 5.0 ⚠️

  • Field added. __u8 s_wtime_hi
  • Field added. __u8 s_mtime_hi
  • Field added. __u8 s_mkfs_time_hi
  • Field added. __u8 s_lastcheck_hi
  • Field added. __u8 s_first_error_time_hi
  • Field added. __u8 s_last_error_time_hi
  • Field added. __u8 s_pad[2]
  • Field type changed. __le32 s_reserved[98] ➡️ __le32 s_reserved[96]
• Changed between 5.0 and 5.3 ⚠️

  • Field added. __le16 s_encoding
  • Field added. __le16 s_encoding_flags
  • Field type changed. __le32 s_reserved[96] ➡️ __le32 s_reserved[95]
• No changes between 5.3 and 5.4 ✅
• Changed between 5.4 and 5.8 ⚠️

  • Field added. __u8 s_first_error_errcode
  • Field added. __u8 s_last_error_errcode
  • Field removed. __u8 s_pad[2]
• No changes between 5.8 and 5.11 ✅
• No changes between 5.11 and 5.13 ✅
• Changed between 5.13 and 5.15 ⚠️

  • Field added. __le32 s_orphan_file_inum
  • Field type changed. __le32 s_reserved[95] ➡️ __le32 s_reserved[94]
• No changes between 5.15 and 5.19 ✅
• No changes between 5.19 and 6.2 ✅
• No changes between 6.2 and 6.5 ✅
• No changes between 6.5 and 6.8 ✅

Arch

• No changes between amd64 and arm64 ✅
• No changes between amd64 and armhf ✅
• No changes between amd64 and ppc64el ✅
• No changes between amd64 and riscv64 ✅

Flavor

• No changes between generic and aws ✅
• No changes between generic and azure ✅
• No changes between generic and gcp ✅
• No changes between generic and lowlatency ✅