blk_alloc_flush_queue

Name:blk_alloc_flush_queue

Proto:struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, int node, int cmd_size, gfp_t flags)

Type:struct blk_flush_queue

Parameter:

Type	Parameter	Name
struct request_queue *	q
int	node
int	cmd_size
gfp_t	flags

492

rq_sz = sizeof(structrequest)

494

fq = kzalloc_node - allocate zeroed memory from a particular memory node.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc).*@node: memory node from which to allocate

495

If Not fq Then Go to fail

498

Process spin lock initialization( & mq_flush_lock)

500

rq_sz = und_up - round up to next specified power of 2*@x: the value to round*@y: multiple to round up to (must be a power of 2)* Rounds @x up to next multiple of @y (which must be a power of 2).* To perform arbitrary rounding up, use roundup() below.(rq_sz + cmd_size, cache_line_size())

501

flush_rq = kzalloc_node - allocate zeroed memory from a particular memory node.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc).*@node: memory node from which to allocate

502

If Not flush_rq Then Go to fail_rq

505

Initialization list head

506

Initialization list head

507

Initialization list head

509

lockdep_register_key( & key)

510

lockdep_set_class( & mq_flush_lock, & key)

512

Return fq

514

515

516

fail :

517

Return NULL

**Caller**
Name	Describe
blk_mq_alloc_hctx

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