blk_mq_do_dispatch

函数名称：Only SCSI implements .get_budget and .put_budget, and SCSI restarts* its queue by itself in its completion handler, so we don't need to* restart queue if .get_budget() returns BLK_STS_NO_RESOURCE.

函数原型：static void blk_mq_do_dispatch_ctx(struct blk_mq_hw_ctx *hctx)

返回类型：void

参数：

类型	参数	名称
struct blk_mq_hw_ctx *	hctx

136

q等于@queue: Pointer to the request queue that owns this hardware context.

137

LIST_HEAD(rq_list)

138

ctx等于READ_ONCE(@dispatch_from: Software queue to be used when no scheduler was* selected.)

140

循环

143

如果非sbitmap_any_bit_set( & @ctx_map: Bitmap for each software queue. If bit is on, there is a* pending request in that software queue.)则退出

146

如果非blk_mq_get_dispatch_budget(hctx)则退出

149

rq等于blk_mq_dequeue_from_ctx(hctx, ctx)

150

如果非rq则

151

blk_mq_put_dispatch_budget(hctx)

152

退出

160

添加链表项

163

ctx等于blk_mq_next_ctx(hctx, mq_ctx)

165

当Returns true if we did some work AND can potentially do more.循环

167

WRITE_ONCE(@dispatch_from: Software queue to be used when no scheduler was* selected., ctx)

**调用者**
名称	描述
blk_mq_sched_dispatch_requests

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