3  * Functions related to segment and merge handling
61 	 * Don't merge if the 1st bio starts with non-zero offset, otherwise it  in bio_will_gap()
63 	 * merge a huge number of small single bios in case of mkfs.  in bio_will_gap()
79 	 *   merge with 'pb'  in bio_will_gap()
514 /* only try to merge bvecs into one sg if they are from two bios */
548 			 * Only try to merge bvecs from two bios given we  in __blk_bios_map_sg()
549 			 * have done bio internal merge when adding pages  in __blk_bios_map_sg()
630 	/* discard request merge won't add new segment */  in ll_new_hw_segment()
735 	/* Merge is OK... */  in ll_merge_requests_fn()
742  * blk_rq_set_mixed_merge - mark a request as mixed merge
743  * @rq: request to mark as mixed merge
782  * front merge.
848 	/* Don't merge requests with different write hints. */  in attempt_merge()
859 	 * If we are allowed to merge, then append bio list  in attempt_merge()
881 	 * a mixed merge, mark both as mixed before proceeding.  This  in attempt_merge()
893 	 * At this point we have either done a back merge or front merge. We  in attempt_merge()
948  * Try to merge 'next' into 'rq'. Return true if the merge happened, false
949  * otherwise. The caller is responsible for freeing 'next' if the merge
966 	/* different data direction or already started, don't merge */  in blk_rq_merge_ok()
970 	/* don't merge across cgroup boundaries */  in blk_rq_merge_ok()
974 	/* only merge integrity protected bio into ditto rq */  in blk_rq_merge_ok()
978 	/* Only merge if the crypt contexts are compatible */  in blk_rq_merge_ok()
982 	/* Don't merge requests with different write hints. */  in blk_rq_merge_ok()
1051 	 * A front merge for writes to sequential zones of a zoned block device  in bio_attempt_front_merge()
1053 	 * merge such write to let it fail.  in bio_attempt_front_merge()
1134  * blk_attempt_plug_merge - try to merge with %current's plugged list
1141  * request on %current's plugged list.  Returns %true if merge was successful,
1181  * Iterate list of requests and see if we can merge this bio with any