Re: [PATCH v5 1/5] fs: direct-io: don't dirtying pages for ITER_BVEC/ITER_KVEC direct read

[Christoph Hellwig]

On Tue, Jun 09, 2015 at 09:49:22PM +0800, Ming Lei wrote:
> When direct read IO is submitted from kernel, it is often
> unnecessary to dirty pages, for example of loop, dirtying pages
> have been considered in the upper filesystem(over loop) side
> already, and they don't need to be dirtied again.
> 
> So this patch doesn't dirtying pages for ITER_BVEC/ITER_KVEC
> direct read, and loop should be the 1st case to use ITER_BVEC/ITER_KVEC
> for direct read I/O.
> 
> The patch is based on previous Dave's patch.

Looks good, thanks!

Reviewed-by: Christoph Hellwig <hch@xxxxxx>
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