[PATCHv2] Use sendfile to copy data between file descriptors

[Denys Vlasenko]

On Wed, Nov 26, 2014 at 4:06 PM, Denys Vlasenko
<vda.linux at googlemail.com> wrote:
> Looks like it will always allocate the copy buffer,
> and always attempt the final read, even if sendfile worked perfectly.
> Can this be avoided?

Please review attached patch.
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