diff options
| author | Christoph Hellwig <hch@lst.de> | 2017-03-22 20:01:51 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-23 03:16:59 +0100 |
| commit | 5eb6126e1c5c5b69d90003444acc99743881b7b7 (patch) | |
| tree | 9cab7739f84564d9bbe060e1b2334ddc8ec3a7b9 /block/blk-mq.c | |
| parent | blk-mq: merge mq and sq make_request instances (diff) | |
| download | linux-5eb6126e1c5c5b69d90003444acc99743881b7b7.tar.xz linux-5eb6126e1c5c5b69d90003444acc99743881b7b7.zip | |
blk-mq: improve blk_mq_try_issue_directly
Rename blk_mq_try_issue_directly to __blk_mq_try_issue_directly and add a
new wrapper that takes care of RCU / SRCU locking to avoid having
boileplate code in the caller which would get duplicated with new callers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to '')
| -rw-r--r-- | block/blk-mq.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 5a1ff4894285..e82e1a9c7d5e 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1430,7 +1430,7 @@ static blk_qc_t request_to_qc_t(struct blk_mq_hw_ctx *hctx, struct request *rq) return blk_tag_to_qc_t(rq->internal_tag, hctx->queue_num, true); } -static void blk_mq_try_issue_directly(struct request *rq, blk_qc_t *cookie, +static void __blk_mq_try_issue_directly(struct request *rq, blk_qc_t *cookie, bool may_sleep) { struct request_queue *q = rq->q; @@ -1475,13 +1475,27 @@ insert: blk_mq_sched_insert_request(rq, false, true, false, may_sleep); } +static void blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx, + struct request *rq, blk_qc_t *cookie) +{ + if (!(hctx->flags & BLK_MQ_F_BLOCKING)) { + rcu_read_lock(); + __blk_mq_try_issue_directly(rq, cookie, false); + rcu_read_unlock(); + } else { + unsigned int srcu_idx = srcu_read_lock(&hctx->queue_rq_srcu); + __blk_mq_try_issue_directly(rq, cookie, true); + srcu_read_unlock(&hctx->queue_rq_srcu, srcu_idx); + } +} + static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) { const int is_sync = op_is_sync(bio->bi_opf); const int is_flush_fua = op_is_flush(bio->bi_opf); struct blk_mq_alloc_data data = { .flags = 0 }; struct request *rq; - unsigned int request_count = 0, srcu_idx; + unsigned int request_count = 0; struct blk_plug *plug; struct request *same_queue_rq = NULL; blk_qc_t cookie; @@ -1579,18 +1593,8 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) } else /* is_sync */ old_rq = rq; blk_mq_put_ctx(data.ctx); - if (!old_rq) - goto done; - - if (!(data.hctx->flags & BLK_MQ_F_BLOCKING)) { - rcu_read_lock(); - blk_mq_try_issue_directly(old_rq, &cookie, false); - rcu_read_unlock(); - } else { - srcu_idx = srcu_read_lock(&data.hctx->queue_rq_srcu); - blk_mq_try_issue_directly(old_rq, &cookie, true); - srcu_read_unlock(&data.hctx->queue_rq_srcu, srcu_idx); - } + if (old_rq) + blk_mq_try_issue_directly(data.hctx, old_rq, &cookie); goto done; } |