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Date:   Tue, 10 Jul 2018 10:17:03 -0700
From:   "Darrick J. Wong" <>
Subject: [PATCH 03/13] ext4: import inode data fork chapter from wiki page

From: Darrick J. Wong <>

Create the basic structure of the "new" data structures & algorithms
book to be ported over from the on-disk format wiki, and then start by
pulling in the introductory information.

Signed-off-by: Darrick J. Wong <>
 Documentation/filesystems/ext4/index.rst        |    1 +
 Documentation/filesystems/ext4/ondisk/about.rst |   44 +++++++++++++++++++++++
 Documentation/filesystems/ext4/ondisk/index.rst |    6 +++
 3 files changed, 51 insertions(+)
 create mode 100644 Documentation/filesystems/ext4/ondisk/about.rst
 create mode 100644 Documentation/filesystems/ext4/ondisk/index.rst

diff --git a/Documentation/filesystems/ext4/index.rst b/Documentation/filesystems/ext4/index.rst
index 1270b34f643f..8fe4f7693e8c 100644
--- a/Documentation/filesystems/ext4/index.rst
+++ b/Documentation/filesystems/ext4/index.rst
@@ -14,3 +14,4 @@ the ext4 community.
+   ondisk/index
diff --git a/Documentation/filesystems/ext4/ondisk/about.rst b/Documentation/filesystems/ext4/ondisk/about.rst
new file mode 100644
index 000000000000..0aadba052264
--- /dev/null
+++ b/Documentation/filesystems/ext4/ondisk/about.rst
@@ -0,0 +1,44 @@
+.. SPDX-License-Identifier: GPL-2.0
+About this Book
+This document attempts to describe the on-disk format for ext4
+filesystems. The same general ideas should apply to ext2/3 filesystems
+as well, though they do not support all the features that ext4 supports,
+and the fields will be shorter.
+**NOTE**: This is a work in progress, based on notes that the author
+(djwong) made while picking apart a filesystem by hand. The data
+structure definitions should be current as of Linux 4.18 and
+e2fsprogs-1.44. All comments and corrections are welcome, since there is
+undoubtedly plenty of lore that might not be reflected in freshly
+created demonstration filesystems.
+This book is licensed under the terms of the GNU Public License, v2.
+ext4 divides a storage device into an array of logical blocks both to
+reduce bookkeeping overhead and to increase throughput by forcing larger
+transfer sizes. Generally, the block size will be 4KiB (the same size as
+pages on x86 and the block layer's default block size), though the
+actual size is calculated as 2 ^ (10 + ``sb.s_log_block_size``) bytes.
+Throughout this document, disk locations are given in terms of these
+logical blocks, not raw LBAs, and not 1024-byte blocks. For the sake of
+convenience, the logical block size will be referred to as
+``$block_size`` throughout the rest of the document.
+When referenced in ``preformatted text`` blocks, ``sb`` refers to fields
+in the super block, and ``inode`` refers to fields in an inode table
+Other References
+Also see for quite a collection of
+information about ext2/3. Here's another old reference:
diff --git a/Documentation/filesystems/ext4/ondisk/index.rst b/Documentation/filesystems/ext4/ondisk/index.rst
new file mode 100644
index 000000000000..98cde12ee8cb
--- /dev/null
+++ b/Documentation/filesystems/ext4/ondisk/index.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+Data Structures and Algorithms
+.. include:: about.rst

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