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    SubjectRe: [PATCH] Check for compound pages in set_page_dirty()
    On Thu, 19 Jul 2007 18:35:17 +0100 (BST)
    Hugh Dickins <hugh@veritas.com> wrote:

    > I didn't see any attention to set_page_dirty in Christoph's
    > Large Blocksize (variable page_cachesize) patches, but I expect
    > he'd also be wanting set_page_dirty to act on compound_head.

    There is no need for special casing if set_page_dirty() is only
    ever called for page heads. Make sure that direct I/O does not call
    set_page_dirty for tail pages.

    A VM_BUG_ON(PageTail(page)) could be used to make sure that this
    does not happen in the future?
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