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    SubjectRe: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again
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    > Therefore, FUSE probably could have been fixed by judicious use
    > of copy_{to,from}_user_page() calls instead of adding this new
    > ad-hoc flush_anon_page() thing.

    Probably, but I don't think either interface is perfect.
    copy_*_user_page() will double flush the user mapping
    (get_user_pages() already does a flush_dcache_page()). Actually
    nothing except ptrace uses the copy_*_user_page() interface even
    though there are many uses of get_user_pages().

    What I think get_user_pages() really needs is a single operation that

    - flushes the virtual address view
    - flushes the kernel view

    regardles whether the page is anonymous or file backed.

    Miklos
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