diff options
Diffstat (limited to 'block/blk-mq-tag.c')
| -rw-r--r-- | block/blk-mq-tag.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 96a39d0724a2..44f3d0967cb4 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -191,6 +191,33 @@ found_tag: return tag + tag_offset; } +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)) { + bt = &rq->mq_hctx->tags->breserved_tags; + tag_offset = 0; + } + + if (!hctx_may_queue(rq->mq_hctx, bt)) + return false; + tag = __sbitmap_queue_get(bt); + if (tag == BLK_MQ_NO_TAG) + 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; +} + void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx, unsigned int tag) { @@ -269,6 +296,7 @@ struct bt_tags_iter_data { #define BT_TAG_ITER_RESERVED (1 << 0) #define BT_TAG_ITER_STARTED (1 << 1) +#define BT_TAG_ITER_STATIC_RQS (1 << 2) static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data) { @@ -282,9 +310,12 @@ static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data) /* * We can hit rq == NULL here, because the tagging functions - * test and set the bit before assining ->rqs[]. + * test and set the bit before assigning ->rqs[]. */ - rq = tags->rqs[bitnr]; + if (iter_data->flags & BT_TAG_ITER_STATIC_RQS) + rq = tags->static_rqs[bitnr]; + else + rq = tags->rqs[bitnr]; if (!rq) return true; if ((iter_data->flags & BT_TAG_ITER_STARTED) && @@ -339,11 +370,13 @@ static void __blk_mq_all_tag_iter(struct blk_mq_tags *tags, * indicates whether or not @rq is a reserved request. Return * true to continue iterating tags, false to stop. * @priv: Will be passed as second argument to @fn. + * + * Caller has to pass the tag map from which requests are allocated. */ void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn, void *priv) { - return __blk_mq_all_tag_iter(tags, fn, priv, 0); + return __blk_mq_all_tag_iter(tags, fn, priv, BT_TAG_ITER_STATIC_RQS); } /** |