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    SubjectRe: Page migration issue with UBIFS
    On Tue, Mar 15, 2016 at 04:32:40PM +0100, Richard Weinberger wrote:
    > > Or if ->page_mkwrite() was called, why the page is not dirty?
    >
    > BTW: UBIFS does not implement ->migratepage(), could this be a problem?

    This might be the reason. I can't reall make sense of
    buffer_migrate_page, but it seems to migrate buffer_head state to
    the new page.

    I'd love to know why CMA even tries to migrate pages that don't have a
    ->migratepage method, this seems incredibly dangerous to me.

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