1 .. SPDX-License-Identifier: GPL-2.0
2
3 About this Book
4 ===============
5
6 This document attempts to describe the on-disk
7 filesystems. The same general ideas should app
8 as well, though they do not support all the fe
9 and the fields will be shorter.
10
11 **NOTE**: This is a work in progress, based on
12 (djwong) made while picking apart a filesystem
13 structure definitions should be current as of
14 e2fsprogs-1.44. All comments and corrections a
15 undoubtedly plenty of lore that might not be r
16 created demonstration filesystems.
17
18 License
19 -------
20 This book is licensed under the terms of the G
21
22 Terminology
23 -----------
24
25 ext4 divides a storage device into an array of
26 reduce bookkeeping overhead and to increase th
27 transfer sizes. Generally, the block size will
28 pages on x86 and the block layer's default blo
29 actual size is calculated as 2 ^ (10 + ``sb.s_
30 Throughout this document, disk locations are g
31 logical blocks, not raw LBAs, and not 1024-byt
32 convenience, the logical block size will be re
33 ``$block_size`` throughout the rest of the doc
34
35 When referenced in ``preformatted text`` block
36 in the super block, and ``inode`` refers to fi
37 entry.
38
39 Other References
40 ----------------
41
42 Also see https://www.nongnu.org/ext2-doc/ for
43 information about ext2/3. Here's another old r
44 http://wiki.osdev.org/Ext2
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