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block: introduce mp_bvec_for_each_page() for iterating over page
mp_bvec_for_each_segment() is a bit big for the iteration, so introduce a light-weight helper for iterating over pages, then 32bytes stack space can be saved. Signed-off-by: Ming Lei <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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