diff options
Diffstat (limited to 'block/blk-merge.c')
| -rw-r--r-- | block/blk-merge.c | 41 |
1 files changed, 12 insertions, 29 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 89b97b5e0881..fc1ff3b1ea1f 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -283,35 +283,6 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq, } EXPORT_SYMBOL(blk_rq_map_sg); -/** - * blk_bio_map_sg - map a bio to a scatterlist - * @q: request_queue in question - * @bio: bio being mapped - * @sglist: scatterlist being mapped - * - * Note: - * Caller must make sure sg can hold bio->bi_phys_segments entries - * - * Will return the number of sg entries setup - */ -int blk_bio_map_sg(struct request_queue *q, struct bio *bio, - struct scatterlist *sglist) -{ - struct scatterlist *sg = NULL; - int nsegs; - struct bio *next = bio->bi_next; - bio->bi_next = NULL; - - nsegs = __blk_bios_map_sg(q, bio, sglist, &sg); - bio->bi_next = next; - if (sg) - sg_mark_end(sg); - - BUG_ON(bio->bi_phys_segments && nsegs > bio->bi_phys_segments); - return nsegs; -} -EXPORT_SYMBOL(blk_bio_map_sg); - static inline int ll_new_hw_segment(struct request_queue *q, struct request *req, struct bio *bio) @@ -385,6 +356,14 @@ static bool req_no_special_merge(struct request *req) return !q->mq_ops && req->special; } +static int req_gap_to_prev(struct request *req, struct request *next) +{ + struct bio *prev = req->biotail; + + return bvec_gap_to_prev(&prev->bi_io_vec[prev->bi_vcnt - 1], + next->bio->bi_io_vec[0].bv_offset); +} + static int ll_merge_requests_fn(struct request_queue *q, struct request *req, struct request *next) { @@ -399,6 +378,10 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req, if (req_no_special_merge(req) || req_no_special_merge(next)) return 0; + if (test_bit(QUEUE_FLAG_SG_GAPS, &q->queue_flags) && + req_gap_to_prev(req, next)) + return 0; + /* * Will it become too large? */ |