178  * bvec_split_segs - verify whether or not a bvec should be split in the middle
191  * big to fit in a single segment and hence that it has to be split in the
222 	/* tell the caller to split the bvec if it is too big to fit */  in bvec_split_segs()
227  * blk_bio_segment_split - split a bio in two bios
229  * @bio:  [in] bio to be split
243  * split bio has finished.
262 			goto split;  in blk_bio_segment_split()
271 			goto split;  in blk_bio_segment_split()
280 split:  in blk_bio_segment_split()
286 	 * big IO can be trival, disable iopoll when split needed.  in blk_bio_segment_split()
294  * __blk_queue_split - split a bio and submit the second half
295  * @bio:     [in, out] bio to be split
298  * Split a bio into two bios, chain the two bios, submit the second half and
300  * big it will be split by a recursive call to this function. Since this
303  * of the split bio has finished.
308 	struct bio *split = NULL;  in __blk_queue_split()  local
313 		split = blk_bio_discard_split(q, *bio, &q->bio_split, nr_segs);  in __blk_queue_split()
316 		split = blk_bio_write_zeroes_split(q, *bio, &q->bio_split,  in __blk_queue_split()
320 		split = blk_bio_write_same_split(q, *bio, &q->bio_split,  in __blk_queue_split()
339 		split = blk_bio_segment_split(q, *bio, &q->bio_split, nr_segs);  in __blk_queue_split()
343 	if (split) {  in __blk_queue_split()
345 		split->bi_opf |= REQ_NOMERGE;  in __blk_queue_split()
347 		bio_chain(split, *bio);  in __blk_queue_split()
348 		trace_block_split(split, (*bio)->bi_iter.bi_sector);  in __blk_queue_split()
350 		*bio = split;  in __blk_queue_split()
357  * blk_queue_split - split a bio and submit the second half
358  * @bio: [in, out] bio to be split
360  * Split a bio into two bios, chains the two bios, submit the second half and
363  * that q->bio_split is only released after processing of the split bio has