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    SubjectRe: Yet another borken page_count() check in invalidate_inode_pages2()....
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    On Wed, 2006-11-15 at 11:24 -0800, Andrew Morton wrote:

    > The protocol is
    >
    > lock_page()
    > set_page_writeback()
    > ->writepage()

    We're not using ->writepage().

    > and there are various places which assume that nobody will start new
    > writeout of a locked page. But I forget where they are - things have always
    > been this way.

    Huh? There has never been a requirement to lock the page if all you want
    to do is call set_page_writeback(). The only reason why we want to do
    that at all is to allow the VM to track that the page is under I/O. All
    other operations involved in scheduling writes are protected by internal
    NFS locks.
    -
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