[PATCH, RFC] xfs: batched discard support

[Mark Lord]

Mark Lord wrote:
> Christoph Hellwig wrote:
..
>> Mark, any chance to try it?  Just create an XFS filesystem, age it a
>> bit and then call the attached little trim.c program on the mountmoint
>> (or any file inside the filesystem for that matter)
> ..
> 
> Looking at it now.  Thanks, Christoph!
..

Fails to work on 64-bit kernel w/ 32-bit userspace (no compat ioctl).
Rebuilding with 32-bit kernel now..