blk_kick_flush

Name:blk_kick_flush

Proto:static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq, unsigned int flags)

Type:void

Parameter:

Type	Parameter	Name
struct request_queue *	q
struct blk_flush_queue *	fq
unsigned int	flags

284

pending = flush_queue[flush_pending_idx]

285

first_rq = list_first_entry - get the first element from a list*@ptr: the list head to take the element from.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.* Note, that list is expected to be not empty.(pending, structrequest, list)

287

flush_rq = flush_rq

290

If flush_pending_idx != flush_running_idx || list_empty - tests whether a list is empty*@head: the list to test. Then Return

299

If Not list_empty - tests whether a list is empty*@head: the list to test. && elevator && time_before(jiffies, flush_pending_since + FLUSH_PENDING_TIMEOUT) Then Return

308

flush_pending_idx ^= 1

310

blk_rq_init(q, flush_rq)

320

mq_ctx = mq_ctx

321

mq_hctx = mq_hctx

323

If Not elevator Then

324

* flush_rq shares tag with this rq, both can't be active * at the same time = first_rq

325

tag = tag

326

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.

327

Else

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internal_tag = internal_tag

331

op and common flags = REQ_OP_FLUSH | REQ_PREFLUSH

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op and common flags |= flags & REQ_DRV | flags & REQ_FAILFAST_MASK

333

rq_flags |= quest for flush sequence

334

rq_disk = rq_disk

335

* completion callback. = flush_end_io

337

blk_flush_queue_rq(flush_rq, false)

**Caller**
Name	Describe
blk_flush_complete_seq	lk_flush_complete_seq - complete flush sequence@rq: PREFLUSH/FUA request being sequenced@fq: flush queue@seq: sequences to complete (mask of %REQ_FSEQ_, can be zero)@error: whether an error occurred@rq just completed @seq part of its flush sequence,

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