[LSF/MM TOPIC] copy offloading

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Discussing copy offloading at LSF is appropriate because it can involve
so many layers of the stack:

 - high level syscall interface
 - in-kernel high level entry point for nfsd 
 - fs specific implementations (btrfs and ocfs2 cow, nfs) 
 - vfs helper for offloading block copies for ext*,xfs
 - bio offload requests for cow block devices like bcache/dm-cache
 - encoding offload bios into scsi reqs
 - processing virt guest device offload requests with host syscalls

Getting the user and in-kernel interfaces right to support all these
moving parts has proven tricky.  The more input, the better.

It's been a while since I sent out a refreshed version of the series.
That'll be remedied before LSF rolls around :). 

- z
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