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Lift bio_split_rw_at into blk_rq_append_bio so that it validates the hardware limits. With this all passthrough callers can simply add bio_add_page to build the bio and delay checking for exceeding of limits to this point instead of doing it for each page. While this looks like adding a new expensive loop over all bio_vecs, blk_rq_append_bio is already doing that just to counter the number of segments. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Link: https://lore.kernel.org/r/20250103073417.459715-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>