Re: [PATCH 3/3] block: loop: use vfs ITER_BVEC to read/write backing file

[Christoph Hellwig]

On Sun, Mar 22, 2015 at 04:14:54PM +0800, Ming Lei wrote:
> Now loop code gets simplified a lot, and becomes more clean.
> 
> Also one extra page copy is avoided for READ in case of none
> transfer.

I really don't like the mess with the wrappers to pretent that read/write
work the same, and the ibvec_rw_data structure doesn't exactly help
readability either.
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