docs: promote the ext4 data structures book to top level

Move the ext4 data structures book to Documentation/filesystems/ext4/
since the administrative information moved elsewhere.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 0 insertions, 37 deletions

diff --git a/Documentation/filesystems/ext4/ondisk/inlinedata.rst b/Documentation/filesystems/ext4/ondisk/inlinedata.rst
deleted file mode 100644
index d1075178ce0b..000000000000
--- a/Documentation/filesystems/ext4/ondisk/inlinedata.rst
+++ /dev/null
@@ -1,37 +0,0 @@
-.. SPDX-License-Identifier: GPL-2.0
-
-Inline Data
------------
-
-The inline data feature was designed to handle the case that a file's
-data is so tiny that it readily fits inside the inode, which
-(theoretically) reduces disk block consumption and reduces seeks. If the
-file is smaller than 60 bytes, then the data are stored inline in
-``inode.i_block``. If the rest of the file would fit inside the extended
-attribute space, then it might be found as an extended attribute
-“system.data” within the inode body (“ibody EA”). This of course
-constrains the amount of extended attributes one can attach to an inode.
-If the data size increases beyond i\_block + ibody EA, a regular block
-is allocated and the contents moved to that block.
-
-Pending a change to compact the extended attribute key used to store
-inline data, one ought to be able to store 160 bytes of data in a
-256-byte inode (as of June 2015, when i\_extra\_isize is 28). Prior to
-that, the limit was 156 bytes due to inefficient use of inode space.
-
-The inline data feature requires the presence of an extended attribute
-for “system.data”, even if the attribute value is zero length.
-
-Inline Directories
-~~~~~~~~~~~~~~~~~~
-
-The first four bytes of i\_block are the inode number of the parent
-directory. Following that is a 56-byte space for an array of directory
-entries; see ``struct ext4_dir_entry``. If there is a “system.data”
-attribute in the inode body, the EA value is an array of
-``struct ext4_dir_entry`` as well. Note that for inline directories, the
-i\_block and EA space are treated as separate dirent blocks; directory
-entries cannot span the two.
-
-Inline directory entries are not checksummed, as the inode checksum
-should protect all inline data contents.