block: remove split code in blkdev_issue_{discard,write_same}
The split code in blkdev_issue_{discard,write_same} can go away now that any driver that cares does the split. We have to make sure bio size doesn't overflow. For discard, we set max discard sectors to (1<<31)>>9 to ensure it doesn't overflow bi_size and hopefully it is of the proper granularity as long as the granularity is a power of two. Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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