| Offset (bytes) | Size (bytes) | Description |
|---|---|---|
| 0 | 4 | s_inodes_count |
| 4 | 4 | s_blocks_count |
| 8 | 4 | s_r_blocks_count |
| 12 | 4 | s_free_blocks_count |
| 16 | 4 | s_free_inodes_count |
| 20 | 4 | s_first_data_block |
| 24 | 4 | s_log_block_size |
| 28 | 4 | s_log_frag_size |
| 32 | 4 | s_blocks_per_group |
| 36 | 4 | s_frags_per_group |
| 40 | 4 | s_inodes_per_group |
| 44 | 4 | s_mtime |
| 48 | 4 | s_wtime |
| 52 | 2 | s_mnt_count |
| 54 | 2 | s_max_mnt_count |
| 56 | 2 | s_magic |
| 58 | 2 | s_state |
| 60 | 2 | s_errors |
| 62 | 2 | s_minor_rev_level |
| 64 | 4 | s_lastcheck |
| 68 | 4 | s_checkinterval |
| 72 | 4 | s_creator_os |
| 76 | 4 | s_rev_level |
| 80 | 2 | s_def_resuid |
| 82 | 2 | s_def_resgid |
| Offset (bytes) | Size (bytes) | Description |
|---|---|---|
| 84 | 4 | s_first_ino |
| 88 | 2 | s_inode_size |
| 90 | 2 | s_block_group_nr |
| 92 | 4 | s_feature_compat |
| 96 | 4 | s_feature_incompat |
| 100 | 4 | s_feature_ro_compat |
| 104 | 16 | s_uuid |
| 120 | 16 | s_volume_name |
| 136 | 64 | s_last_mounted |
| 200 | 4 | s_algo_bitmap |
| Offset (bytes) | Size (bytes) | Description |
|---|---|---|
| 204 | 1 | s_prealloc_blocks |
| 205 | 1 | s_prealloc_dir_blocks |
| 206 | 2 | (alignment) |
| Offset (bytes) | Size (bytes) | Description |
|---|---|---|
| 208 | 16 | s_journal_uuid |
| 224 | 16 | s_journal_inum |
| 228 | 4 | s_journal_dev |
| 232 | 4 | s_last_orphan |
| Offset (bytes) | Size (bytes) | Description |
|---|---|---|
| 236 | 4 | s_hash_seed |
| 252 | 1 | s_def_hash_version |
| 253 | 3 | padding - reserved for future expansion |
| Offset (bytes) | Size (bytes) | Description |
|---|---|---|
| 256 | 4 | s_default_mount_options |
| 260 | 4 | s_first_meta_bg |
| 264 | 760 | unused - reserved for future revisions |
s_inodes_count
Offset: 0 bytes
Size: 4 bytes
32bit value indicating the total number of inodes, both used and free, in the file system. This value must be lower or equal to(s_inodes_per_group * number of block groups). It must be equal to the sum of the inodes defined in each block group.