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block: Add warning for bi_next not NULL in bio_endio()
Recently found a bug where a driver left bi_next not NULL and then called bio_endio(), and then the submitter of the bio used bio_copy_data() which was treating src and dst as lists of bios. Fixed that bug by splitting out bio_list_copy_data(), but in case other things are depending on bi_next in weird ways, add a warning to help avoid more bugs like that in the future. Signed-off-by: Kent Overstreet <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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