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Found a bug (with ASAN) where we were passing a bio to bio_copy_data() with bi_next not NULL, when it should have been - a driver had left bi_next set to something after calling bio_endio(). Since the normal case is only copying single bios, split out bio_list_copy_data() to avoid more bugs like this in the future. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>