block: create a bio_try_merge_pc_page helper
Passsthrough bio handling should be the same as normal bio handling, except that we need to take hardware limitations into account. Thus use the common try_merge implementation after checking the hardware limits. This changes behavior in that we now also check segment and dma boundary settings for same page merges, which is a little more work but has no effect as those need to be larger than the page size. Signed-off-by:Christoph Hellwig <hch@lst.de> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
320ea869
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