On Tue, Sep 09, 2025 at 09:43:55AM +0100, John Garry wrote:
>> +static inline void bio_init_inline(struct bio *bio, struct block_device *bdev,
>> + unsigned short max_vecs, blk_opf_t opf)
>> +{
>
> I suppose that a WARN_ON(max_vecs > BIO_MAX_INLINE_VECS) could be added,
> but I don't think that we generally protect against such self-inflicted
> programming errors.
It's not needed because there isn't actually any such limit.
BIO_MAX_INLINE_VECS is misnamed and misguided. Various places in the
block layer require non-passthrough bios to not have more vectors than
BIO_MAX_VECS, while BIO_MAX_INLINE_VECS is a random upper bound for
passthrough I/O without a deeper meaning.
