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    SubjectRe: [PATCH v2 4/7] iov_iter: new iov_iter_pin_pages*() routines
    On Tue, Aug 30, 2022 at 09:18:40PM -0700, John Hubbard wrote:
    > Provide two new wrapper routines that are intended for user space pages
    > only:
    >
    > iov_iter_pin_pages()
    > iov_iter_pin_pages_alloc()
    >
    > Internally, these routines call pin_user_pages_fast(), instead of
    > get_user_pages_fast(), for user_backed_iter(i) and iov_iter_bvec(i)
    > cases.
    >
    > As always, callers must use unpin_user_pages() or a suitable FOLL_PIN
    > variant, to release the pages, if they actually were acquired via
    > pin_user_pages_fast().
    >
    > This is a prerequisite to converting bio/block layers over to use
    > pin_user_pages_fast().

    What of ITER_PIPE (splice from O_DIRECT fd to a to pipe, for filesystem
    that uses generic_file_splice_read())?

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