diff options
Diffstat (limited to 'block/blk-merge.c')
| -rw-r--r-- | block/blk-merge.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 5efc9e7a68b..6cf8f0c70a5 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -11,7 +11,7 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect) { - if (blk_fs_request(rq)) { + if (blk_fs_request(rq) || blk_discard_rq(rq)) { rq->hard_sector += nsect; rq->hard_nr_sectors -= nsect; @@ -131,13 +131,17 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio, if (!test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags)) return 0; - if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt))) - return 0; if (bio->bi_size + nxt->bi_size > q->max_segment_size) return 0; + if (!bio_has_data(bio)) + return 1; + + if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt))) + return 0; + /* - * bio and nxt are contigous in memory, check if the queue allows + * bio and nxt are contiguous in memory; check if the queue allows * these two to be merged into one */ if (BIO_SEG_BOUNDARY(q, bio, nxt)) @@ -153,8 +157,9 @@ static int blk_hw_contig_segment(struct request_queue *q, struct bio *bio, blk_recount_segments(q, bio); if (!bio_flagged(nxt, BIO_SEG_VALID)) blk_recount_segments(q, nxt); - if (!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) || - BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size)) + if (bio_has_data(bio) && + (!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) || + BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size))) return 0; if (bio->bi_hw_back_size + nxt->bi_hw_front_size > q->max_segment_size) return 0; @@ -317,8 +322,9 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req, if (!bio_flagged(bio, BIO_SEG_VALID)) blk_recount_segments(q, bio); len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size; - if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio)) - && !BIOVEC_VIRT_OVERSIZE(len)) { + if (!bio_has_data(bio) || + (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio)) + && !BIOVEC_VIRT_OVERSIZE(len))) { int mergeable = ll_new_mergeable(q, req, bio); if (mergeable) { @@ -356,8 +362,9 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req, blk_recount_segments(q, bio); if (!bio_flagged(req->bio, BIO_SEG_VALID)) blk_recount_segments(q, req->bio); - if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(req->bio)) && - !BIOVEC_VIRT_OVERSIZE(len)) { + if (!bio_has_data(bio) || + (BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(req->bio)) && + !BIOVEC_VIRT_OVERSIZE(len))) { int mergeable = ll_new_mergeable(q, req, bio); if (mergeable) { |