Xi Shen posted on Fri, 30 Oct 2009 20:50:44 +0800 as excerpted:

> hi,
> 
> i am using gentoo x64. i want to try xen, but my file system is ext4,
> and i cannot fine ext4 support while compiling xen-source. have i missed
> something, or ext4 is not supported by xen for now? when will it be
> available?

xen uses out-of-mainline patches, and it appears at least the versions in 
the Gentoo tree are pretty old, 2.6.18 as ~arch and 2.6.21 hard-masked.  
AFAIK, that's well before ext4 was declared non-dev.  I don't think you 
want to /touch/ ext4 from that old, if it was even in the tree as
ext4-dev yet.

Generally, the folks that are interested in xen run servers and are very 
conservative about the filesystems they'll run, even more than the apps 
they run, which they want stable and well tested.  They're not the type 
to want any surprises or take any not absolutely necessary risks -- and 
quite the type that would consider any filesystem not yet at least three 
years old to be just that, an "unnecessary risk".  It's thus unlikely 
that you'll find much interest in ext4 on xen for some time.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman