Ext4 Howto

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  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
  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

NOTE: Once mounted with -o extents, the partition cannot mounted with -t ext3 any more!

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

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