212  * bvec_split_segs - verify whether or not a bvec should be split in the middle
213  * @lim:      [in] queue limits to split based on
225  * big to fit in a single segment and hence that it has to be split in the
255 	/* tell the caller to split the bvec if it is too big to fit */  in bvec_split_segs()
268  * bio_split_rw - split a bio in two bios
269  * @bio:  [in] bio to be split
270  * @lim:  [in] queue limits to split based on
285  * split bio has finished.
300 			goto split;  in bio_split_rw()
310 				goto split;  in bio_split_rw()
319 split:  in bio_split_rw()
334 	 * split size so that each bio is properly block size aligned, even if  in bio_split_rw()
342 	 * big IO can be trival, disable iopoll when split needed.  in bio_split_rw()
350  * __bio_split_to_limits - split a bio to fit the queue limits
351  * @bio:     bio to be split
352  * @lim:     queue limits to split based on
355  * Check if @bio needs splitting based on the queue limits, and if so split off
359  * The split bio is allocated from @q->bio_split, which is provided by the
367 	struct bio *split;  in __bio_split_to_limits()  local
372 		split = bio_split_discard(bio, lim, nr_segs, bs);  in __bio_split_to_limits()
375 		split = bio_split_write_zeroes(bio, lim, nr_segs, bs);  in __bio_split_to_limits()
378 		split = bio_split_rw(bio, lim, nr_segs, bs,  in __bio_split_to_limits()
380 		if (IS_ERR(split))  in __bio_split_to_limits()
385 	if (split) {  in __bio_split_to_limits()
386 		/* there isn't chance to merge the split bio */  in __bio_split_to_limits()
387 		split->bi_opf |= REQ_NOMERGE;  in __bio_split_to_limits()
389 		blkcg_bio_issue_init(split);  in __bio_split_to_limits()
390 		bio_chain(split, bio);  in __bio_split_to_limits()
391 		trace_block_split(split, bio->bi_iter.bi_sector);  in __bio_split_to_limits()
393 		return split;  in __bio_split_to_limits()
399  * bio_split_to_limits - split a bio to fit the queue limits
400  * @bio:     bio to be split
403  * if so split off a bio fitting the limits from the beginning of @bio and
406  * The split bio is allocated from @q->bio_split, which is provided by the