| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | |
| 3 | Special inodes |
| 4 | -------------- |
| 5 | |
| 6 | ext4 reserves some inode for special features, as follows: |
| 7 | |
| 8 | .. list-table:: |
| 9 | :widths: 6 70 |
| 10 | :header-rows: 1 |
| 11 | |
| 12 | * - inode Number |
| 13 | - Purpose |
| 14 | * - 0 |
| 15 | - Doesn't exist; there is no inode 0. |
| 16 | * - 1 |
| 17 | - List of defective blocks. |
| 18 | * - 2 |
| 19 | - Root directory. |
| 20 | * - 3 |
| 21 | - User quota. |
| 22 | * - 4 |
| 23 | - Group quota. |
| 24 | * - 5 |
| 25 | - Boot loader. |
| 26 | * - 6 |
| 27 | - Undelete directory. |
| 28 | * - 7 |
| 29 | - Reserved group descriptors inode. (“resize inode”) |
| 30 | * - 8 |
| 31 | - Journal inode. |
| 32 | * - 9 |
| 33 | - The “exclude” inode, for snapshots(?) |
| 34 | * - 10 |
| 35 | - Replica inode, used for some non-upstream feature? |
| 36 | * - 11 |
| 37 | - Traditional first non-reserved inode. Usually this is the lost+found directory. See s\_first\_ino in the superblock. |
| 38 | |