support for FSCTL_QUERY_ALLOCATED_RANGES.

[Björn Jacke]

On 2010-04-05 at 19:35 -0700 Jeremy Allison sent off:
> On Mon, Apr 05, 2010 at 08:30:03PM -0400, Ira Cooper wrote:
> > It worked.
> > 
> > I've pulled it into my git over my version.  So... seems reasonable to me.
> 
> Pushed into master. It'll be in 3.6.0. If you need it earlier
> than that (in the 3.5.x stream) log a bug in bugzilla.samba.org.

Jeremy, do you think it's much work to extend the patch to use fiemap on Linux
to get the real allocation information of the file?  With strict allocate
enabled we would only need to save the sparse flag along with the the dos
attributes in EAs to get pretty well sparse file support.

Björn
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