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authorMing Lei <ming.lei@redhat.com>2020-06-30 22:03:57 +0800
committerJens Axboe <axboe@kernel.dk>2020-06-30 12:57:59 -0600
commit37f4a24c2469a10a4c16c641671bd766e276cf9f (patch)
treedfc8b59c211c73499b74e0c176fba2ae157042cf /block/blk-mq.c
parent723bf178f158abd1ce6069cb049581b3cb003aab (diff)
downloadlinux-37f4a24c2469a10a4c16c641671bd766e276cf9f.tar.bz2
blk-mq: centralise related handling into blk_mq_get_driver_tag
Move .nr_active update and request assignment into blk_mq_get_driver_tag(), all are good to do during getting driver tag. Meantime blk-flush related code is simplified and flush request needn't to update the request table manually any more. Signed-off-by: Ming Lei <ming.lei@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
-rw-r--r--block/blk-mq.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 803d4ee3b8de..65e0846fd065 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -277,26 +277,20 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
{
struct blk_mq_tags *tags = blk_mq_tags_from_data(data);
struct request *rq = tags->static_rqs[tag];
- req_flags_t rq_flags = 0;
if (data->q->elevator) {
rq->tag = BLK_MQ_NO_TAG;
rq->internal_tag = tag;
} else {
- if (data->hctx->flags & BLK_MQ_F_TAG_SHARED) {
- rq_flags = RQF_MQ_INFLIGHT;
- atomic_inc(&data->hctx->nr_active);
- }
rq->tag = tag;
rq->internal_tag = BLK_MQ_NO_TAG;
- data->hctx->tags->rqs[rq->tag] = rq;
}
/* csd/requeue_work/fifo_time is initialized before use */
rq->q = data->q;
rq->mq_ctx = data->ctx;
rq->mq_hctx = data->hctx;
- rq->rq_flags = rq_flags;
+ rq->rq_flags = 0;
rq->cmd_flags = data->cmd_flags;
if (data->flags & BLK_MQ_REQ_PREEMPT)
rq->rq_flags |= RQF_PREEMPT;
@@ -1127,9 +1121,10 @@ static bool __blk_mq_get_driver_tag(struct request *rq)
{
struct sbitmap_queue *bt = &rq->mq_hctx->tags->bitmap_tags;
unsigned int tag_offset = rq->mq_hctx->tags->nr_reserved_tags;
- bool shared = blk_mq_tag_busy(rq->mq_hctx);
int tag;
+ blk_mq_tag_busy(rq->mq_hctx);
+
if (blk_mq_tag_is_reserved(rq->mq_hctx->sched_tags, rq->internal_tag)) {
bt = &rq->mq_hctx->tags->breserved_tags;
tag_offset = 0;
@@ -1142,19 +1137,22 @@ static bool __blk_mq_get_driver_tag(struct request *rq)
return false;
rq->tag = tag + tag_offset;
- if (shared) {
- rq->rq_flags |= RQF_MQ_INFLIGHT;
- atomic_inc(&rq->mq_hctx->nr_active);
- }
- rq->mq_hctx->tags->rqs[rq->tag] = rq;
return true;
}
static bool blk_mq_get_driver_tag(struct request *rq)
{
- if (rq->tag != BLK_MQ_NO_TAG)
- return true;
- return __blk_mq_get_driver_tag(rq);
+ struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
+
+ if (rq->tag == BLK_MQ_NO_TAG && !__blk_mq_get_driver_tag(rq))
+ return false;
+
+ if (hctx->flags & BLK_MQ_F_TAG_SHARED) {
+ rq->rq_flags |= RQF_MQ_INFLIGHT;
+ atomic_inc(&hctx->nr_active);
+ }
+ hctx->tags->rqs[rq->tag] = rq;
+ return true;
}
static int blk_mq_dispatch_wake(wait_queue_entry_t *wait, unsigned mode,