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    SubjectRe: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn
    On Thu, Jan 12, 2017 at 3:02 PM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    >
    > Looking at the callers of "do_splice_to()", we already have the
    > wait_for_space() in do_splice(), but we do *not* have it in the
    > do_splice_from() case when both the input and output file descriptors
    > are pipes.

    Bah. That case doesn't even trigger the new code. I was lazy with my
    grep. The two cases are "do_splice()" (which does have the
    wait-for-space) and splice_direct_to_actor(). And
    splice_direct_to_actor() shouldn't even need it, should it?

    So ignore that. But I think there is something about the EAGAIN.

    Linus

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