block: bio: kill BIO_MAX_SIZE
No one need this macro now, so remove it. Basically only how many bvecs in one bio matters instead of how many bytes in this bio. The motivation is for supporting multipage bvecs, in which we only know what the max count of bvecs is supported in the bio. Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMing Lei <ming.lei@canonical.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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