Move blk_mq_tag_busy(), .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.
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
block/blk-flush.c | 13 ++++---------
block/blk-mq-tag.h | 12 ------------
block/blk-mq.c | 33 +++++++++++++--------------------
block/blk.h | 5 -----
4 files changed, 17 insertions(+), 46 deletions(-)
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 21108a550fbf..3b0c5cfe922a 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -236,12 +236,10 @@ static void flush_end_io(struct request *flush_rq, blk_status_t error)
error = fq->rq_status;
hctx = flush_rq->mq_hctx;
- if (!q->elevator) {
- blk_mq_tag_set_rq(hctx, flush_rq->tag, fq->orig_rq);
+ if (!q->elevator)
flush_rq->tag = -1;
- } else {
+ else
flush_rq->internal_tag = -1;
- }
running = &fq->flush_queue[fq->flush_running_idx];
BUG_ON(fq->flush_pending_idx == fq->flush_running_idx);
@@ -315,13 +313,10 @@ static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq,
flush_rq->mq_ctx = first_rq->mq_ctx;
flush_rq->mq_hctx = first_rq->mq_hctx;
- if (!q->elevator) {
- fq->orig_rq = first_rq;
+ if (!q->elevator)
flush_rq->tag = first_rq->tag;
- blk_mq_tag_set_rq(flush_rq->mq_hctx, first_rq->tag, flush_rq);
- } else {
+ else
flush_rq->internal_tag = first_rq->internal_tag;
- }
flush_rq->cmd_flags = REQ_OP_FLUSH | REQ_PREFLUSH;
flush_rq->cmd_flags |= (flags & REQ_DRV) | (flags & REQ_FAILFAST_MASK);
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index 3945c7f5b944..b1acac518c4e 100644
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -101,18 +101,6 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
return atomic_read(&hctx->nr_active) < depth;
}
-/*
- * This helper should only be used for flush request to share tag
- * with the request cloned from, and both the two requests can't be
- * in flight at the same time. The caller has to make sure the tag
- * can't be freed.
- */
-static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
- unsigned int tag, struct request *rq)
-{
- hctx->tags->rqs[tag] = rq;
-}
-
static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
unsigned int tag)
{
diff --git a/block/blk-mq.c b/block/blk-mq.c
index cabeeeb3d56c..44b101757d33 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->flags & BLK_MQ_REQ_INTERNAL) {
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;
@@ -380,8 +374,6 @@ static struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data)
retry:
data->ctx = blk_mq_get_ctx(q);
data->hctx = blk_mq_map_queue(q, data->cmd_flags, data->ctx);
- if (!(data->flags & BLK_MQ_REQ_INTERNAL))
- blk_mq_tag_busy(data->hctx);
/*
* Waiting allocations only fail because of an inactive hctx. In that
@@ -478,8 +470,6 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
if (q->elevator)
data.flags |= BLK_MQ_REQ_INTERNAL;
- else
- blk_mq_tag_busy(data.hctx);
ret = -EWOULDBLOCK;
tag = blk_mq_get_tag(&data);
@@ -1131,7 +1121,6 @@ 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;
if (blk_mq_tag_is_reserved(rq->mq_hctx->sched_tags, rq->internal_tag)) {
@@ -1146,19 +1135,23 @@ 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;
+ bool shared = blk_mq_tag_busy(rq->mq_hctx);
+
+ if (rq->tag == BLK_MQ_NO_TAG && !__blk_mq_get_driver_tag(rq))
+ return false;
+
+ if (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,
diff --git a/block/blk.h b/block/blk.h
index 3a120a070dac..459790f9783d 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -25,11 +25,6 @@ struct blk_flush_queue {
struct list_head flush_data_in_flight;
struct request *flush_rq;
- /*
- * flush_rq shares tag with this rq, both can't be active
- * at the same time
- */
- struct request *orig_rq;
struct lock_class_key key;
spinlock_t mq_flush_lock;
};
