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docs: fix up the obviously obsolete bits in the new ext4 documentation

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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Theodore Ts'o 2018-07-29 16:35:23 -04:00
parent f5cb282d8b
commit 0694f8c39f
2 changed files with 11 additions and 42 deletions
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51
Documentation/filesystems/ext4/ext4.rst
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@ -20,43 +20,32 @@ Note: More extensive information for getting started with ext4 can be
found at the ext4 wiki site at the URL:
http://ext4.wiki.kernel.org/index.php/Ext4_Howto
- Compile and install the latest version of e2fsprogs (as of this
writing version 1.41.3) from:
http://sourceforge.net/project/showfiles.php?group_id=2406
or
- The latest version of e2fsprogs can be found at:
https://www.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/
or
http://sourceforge.net/project/showfiles.php?group_id=2406
or grab the latest git repository from:
git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
- Note that it is highly important to install the mke2fs.conf file
that comes with the e2fsprogs 1.41.x sources in /etc/mke2fs.conf. If
you have edited the /etc/mke2fs.conf file installed on your system,
you will need to merge your changes with the version from e2fsprogs
1.41.x.
- Create a new filesystem using the ext4 filesystem type:::
- Create a new filesystem using the ext4 filesystem type:
# mke2fs -t ext4 /dev/hda1
Or to configure an existing ext3 filesystem to support extents:::
Or to configure an existing ext3 filesystem to support extents:
# tune2fs -O extents /dev/hda1
If the filesystem was created with 128 byte inodes, it can be
converted to use 256 byte for greater efficiency via:::
converted to use 256 byte for greater efficiency via:
# tune2fs -I 256 /dev/hda1
(Note: we currently do not have tools to convert an ext4
filesystem back to ext3; so please do not do try this on production
filesystems.)
- Mounting:::
- Mounting:
# mount -t ext4 /dev/hda1 /wherever
@ -106,26 +95,6 @@ Currently Available
[1] Filesystems with a block size of 1k may see a limit imposed by the
directory hash tree having a maximum depth of two.
Candidate Features for Future Inclusion
---------------------------------------
* online defrag (patches available but not well tested)
* reduced mke2fs time via lazy itable initialization in conjunction with
the uninit_bg feature (capability to do this is available in e2fsprogs
but a kernel thread to do lazy zeroing of unused inode table blocks
after filesystem is first mounted is required for safety)
There are several others under discussion, whether they all make it in is
partly a function of how much time everyone has to work on them. Features like
metadata checksumming have been discussed and planned for a bit but no patches
exist yet so I'm not sure they're in the near-term roadmap.
The big performance win will come with mballoc, delalloc and flex_bg
grouping of bitmaps and inode tables. Some test results available here:
- http://www.bullopensource.org/ext4/20080818-ffsb/ffsb-write-2.6.27-rc1.html
- http://www.bullopensource.org/ext4/20080818-ffsb/ffsb-readwrite-2.6.27-rc1.html
Options
=======

2
Documentation/index.rst
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@ -109,7 +109,7 @@ The documentation in this section are provided by specific filesystem
subprojects.
.. toctree::
:maxdepth: 4
:maxdepth: 2
filesystems/ext4/index