__blk_mq_tag

Name:If a previously inactive queue goes active, bump the active user count.* We need to do this before try to allocate driver tag, then even if fail* to get tag when first time, the other shared-tag users could reserve* budget for it.

Proto:bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)

Type:bool

Parameter:

Type	Parameter	Name
struct blk_mq_hw_ctx *	hctx

If Not Determine whether a bit is set(BLK_MQ_S_TAG_ACTIVE, & @state: BLK_MQ_S_* flags. Defines the state of the hw* queue (active, scheduled to restart, stopped).) && Not st_and_set_bit - Set a bit and return its old value*@nr: Bit to set*@addr: Address to count from* This is an atomic fully-ordered operation (implied full memory barrier). Then atomic_inc( & active_queues)

Return true

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