ext4 online defrag status?

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I was wondering what is the status of online defragment for ext4?


Generally, fragmentation isn't a big problem with every day usage, but can bite when virtual machine (i.e. KVM) disk images are files.

For example:

vm-111-disk-1.raw: 28054 extents found, perfection would be 138 extents


There have been some ext4 defrag patches posted in 2008 and 2009 - what is the state of this now in late 2010?



--
Tomasz Chmielewski
http://wpkg.org
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