EXT4 online defrag

[Andy Whitcroft]

We have a request (via launchpad) to pull in patches for ext4 to enable
online defrag on our queue.  Currently these patches are not in
mainline, though they appear slated to hit .29 or .30.  My feeling 
is that with the bugs we have open hinting at ext4 stability issues it
would be very presumtious to add yet more patches which are not in
mainline.  There is a high probabsaility we will have to pull in some
ext4 patches to fix these other issues and the online defrag patches can
only increase the difficulty.

I feel our position on this therefore should be that we are not going to
fix it as the risk is so high, and indicate that we are likely to get
this functionality for free in K.K.

Comments?

-apw