1 .. SPDX-License-Identifier: GPL-2.0
2
3 Special inodes
4 --------------
5
6 ext4 reserves some inode for special features,
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. (“r
30 * - 8
31 - Journal inode.
32 * - 9
33 - The “exclude” inode, for snapshots(
34 * - 10
35 - Replica inode, used for some non-upstre
36 * - 11
37 - Traditional first non-reserved inode. U
38
39 Note that there are also some inodes allocated
40 for other filesystem features which are not re
41 hierarchy. These are generally reference from
42
43 .. list-table::
44 :widths: 20 50
45 :header-rows: 1
46
47 * - Superblock field
48 - Description
49
50 * - s_lpf_ino
51 - Inode number of lost+found directory.
52 * - s_prj_quota_inum
53 - Inode number of quota file tracking pro
54 * - s_orphan_file_inum
55 - Inode number of file tracking orphan in
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