Based on kernel version 6.8
. Page generated on 2024-03-11 21:26 EST
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | .. SPDX-License-Identifier: GPL-2.0 Special inodes -------------- ext4 reserves some inode for special features, as follows: .. list-table:: :widths: 6 70 :header-rows: 1 * - inode Number - Purpose * - 0 - Doesn't exist; there is no inode 0. * - 1 - List of defective blocks. * - 2 - Root directory. * - 3 - User quota. * - 4 - Group quota. * - 5 - Boot loader. * - 6 - Undelete directory. * - 7 - Reserved group descriptors inode. (“resize inode”) * - 8 - Journal inode. * - 9 - The “exclude” inode, for snapshots(?) * - 10 - Replica inode, used for some non-upstream feature? * - 11 - Traditional first non-reserved inode. Usually this is the lost+found directory. See s_first_ino in the superblock. Note that there are also some inodes allocated from non-reserved inode numbers for other filesystem features which are not referenced from standard directory hierarchy. These are generally reference from the superblock. They are: .. list-table:: :widths: 20 50 :header-rows: 1 * - Superblock field - Description * - s_lpf_ino - Inode number of lost+found directory. * - s_prj_quota_inum - Inode number of quota file tracking project quotas * - s_orphan_file_inum - Inode number of file tracking orphan inodes. |