Ext4 Howto

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(from http://www.bullopensource.org/ext4/ and other places)
 
(git repo added, some notes about e2fsprogs)
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# Enable <tt>EXT4DEV_FS</tt> (along with <tt>EXT4DEV_FS_XATTR</tt> and <tt>EXT4DEV_FS_POSIX_ACL</tt> if you like) in your kernel <tt>.config</tt>
 
# Enable <tt>EXT4DEV_FS</tt> (along with <tt>EXT4DEV_FS_XATTR</tt> and <tt>EXT4DEV_FS_POSIX_ACL</tt> if you like) in your kernel <tt>.config</tt>
# Get & compile a [ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs-interim/ patched version of e2fsprogs]
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# Get & compile a patched version of e2fsprogs
# We're still using '<tt>mkfs.ext3 /dev/DEVICE</tt>' to create the filesystem
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## Either get it from [ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs-interim/ kernel.org] or
# To mount the partition as Ext4:
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## use the <tt>"pu"</tt> branch from the [http://git.kernel.org/?p=fs/ext2/e2fsprogs.git;a=summary git repository]:
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        git clone git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
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        cd e2fsprogs
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        git checkout -b pu
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3. We're still using '<tt>mkfs.ext3 /dev/DEVICE</tt>' to create the filesystem<br>
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4. To mount the partition as Ext4:
 
   mount -t ext4dev /dev/DEV /wherever
 
   mount -t ext4dev /dev/DEV /wherever
 
To enable [http://lwn.net/Articles/194869/ extents], use:
 
To enable [http://lwn.net/Articles/194869/ extents], use:
 
   mount -t ext4dev -o extents /dev/DEVICE /wherever
 
   mount -t ext4dev -o extents /dev/DEVICE /wherever
NOTE: Once mounted with <tt>-o extents</tt>, the partition cannot mounted with <tt>-t ext3</tt> any more!
 
 
 
Some (most? all?) of the ext3 mountoptions are still supported: <tt>nobh, user_xattr, acl</tt>.
 
Some (most? all?) of the ext3 mountoptions are still supported: <tt>nobh, user_xattr, acl</tt>.
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NOTE:
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* Once mounted with <tt>-o extents</tt>, the partition cannot mounted with <tt>-t ext3</tt> any more!
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* The version of e2fsprogs mentioned above is '''NOT''' meant to be used for production system. Development of these tools wrt Ext4 support is still in high flux and [http://www.mail-archive.com/linux-ext4@vger.kernel.org/msg04136.html the tools don't get much testing] atm.

Revision as of 15:07, 20 November 2007

  1. Enable EXT4DEV_FS (along with EXT4DEV_FS_XATTR and EXT4DEV_FS_POSIX_ACL if you like) in your kernel .config
  2. Get & compile a patched version of e2fsprogs
    1. Either get it from kernel.org or
    2. use the "pu" branch from the git repository:
       git clone git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
       cd e2fsprogs
       git checkout -b pu

3. We're still using 'mkfs.ext3 /dev/DEVICE' to create the filesystem
4. To mount the partition as Ext4:

 mount -t ext4dev /dev/DEV /wherever

To enable extents, use:

 mount -t ext4dev -o extents /dev/DEVICE /wherever

Some (most? all?) of the ext3 mountoptions are still supported: nobh, user_xattr, acl.


NOTE:

  • Once mounted with -o extents, the partition cannot mounted with -t ext3 any more!
  • The version of e2fsprogs mentioned above is NOT meant to be used for production system. Development of these tools wrt Ext4 support is still in high flux and the tools don't get much testing atm.
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