diff options
| -rw-r--r-- | block/blk-merge.c | 31 | ||||
| -rw-r--r-- | block/blk.h | 4 |
2 files changed, 18 insertions, 17 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 6aa43dec5af4..3826fc32b72c 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -659,31 +659,32 @@ static void blk_account_io_merge(struct request *req) } /* - * Has to be called with the request spinlock acquired + * For non-mq, this has to be called with the request spinlock acquired. + * For mq with scheduling, the appropriate queue wide lock should be held. */ -static int attempt_merge(struct request_queue *q, struct request *req, - struct request *next) +static struct request *attempt_merge(struct request_queue *q, + struct request *req, struct request *next) { if (!rq_mergeable(req) || !rq_mergeable(next)) - return 0; + return NULL; if (req_op(req) != req_op(next)) - return 0; + return NULL; /* * not contiguous */ if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next)) - return 0; + return NULL; if (rq_data_dir(req) != rq_data_dir(next) || req->rq_disk != next->rq_disk || req_no_special_merge(next)) - return 0; + return NULL; if (req_op(req) == REQ_OP_WRITE_SAME && !blk_write_same_mergeable(req->bio, next->bio)) - return 0; + return NULL; /* * If we are allowed to merge, then append bio list @@ -692,7 +693,7 @@ static int attempt_merge(struct request_queue *q, struct request *req, * counts here. */ if (!ll_merge_requests_fn(q, req, next)) - return 0; + return NULL; /* * If failfast settings disagree or any of the two is already @@ -735,27 +736,27 @@ static int attempt_merge(struct request_queue *q, struct request *req, /* owner-ship of bio passed from next to req */ next->bio = NULL; __blk_put_request(q, next); - return 1; + return next; } -int attempt_back_merge(struct request_queue *q, struct request *rq) +struct request *attempt_back_merge(struct request_queue *q, struct request *rq) { struct request *next = elv_latter_request(q, rq); if (next) return attempt_merge(q, rq, next); - return 0; + return NULL; } -int attempt_front_merge(struct request_queue *q, struct request *rq) +struct request *attempt_front_merge(struct request_queue *q, struct request *rq) { struct request *prev = elv_former_request(q, rq); if (prev) return attempt_merge(q, prev, rq); - return 0; + return NULL; } int blk_attempt_req_merge(struct request_queue *q, struct request *rq, @@ -767,7 +768,7 @@ int blk_attempt_req_merge(struct request_queue *q, struct request *rq, if (!e->type->ops.sq.elevator_allow_rq_merge_fn(q, rq, next)) return 0; - return attempt_merge(q, rq, next); + return attempt_merge(q, rq, next) != NULL; } bool blk_rq_merge_ok(struct request *rq, struct bio *bio) diff --git a/block/blk.h b/block/blk.h index 6aa53a4aad88..4972b98d47e1 100644 --- a/block/blk.h +++ b/block/blk.h @@ -208,8 +208,8 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req, struct bio *bio); int ll_front_merge_fn(struct request_queue *q, struct request *req, struct bio *bio); -int attempt_back_merge(struct request_queue *q, struct request *rq); -int attempt_front_merge(struct request_queue *q, struct request *rq); +struct request *attempt_back_merge(struct request_queue *q, struct request *rq); +struct request *attempt_front_merge(struct request_queue *q, struct request *rq); int blk_attempt_req_merge(struct request_queue *q, struct request *rq, struct request *next); void blk_recalc_rq_segments(struct request *rq); |