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block, sx8: kill blk_insert_request()

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The only user left for blk_insert_request() is sx8 and it can be
trivially switched to use blk_execute_rq_nowait() - special requests
aren't included in io stat and sx8 doesn't use block layer tagging.
Switch sx8 and kill blk_insert_requeset().

This patch doesn't introduce any functional difference.

Only compile tested.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2011-12-14 00:33:37 +01:00 committed by Jens Axboe
parent dc47ce90c3
commit 1ba64edef6
3 changed files with 8 additions and 53 deletions
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48
block/blk-core.c
View File

@ -1010,54 +1010,6 @@ static void add_acct_request(struct request_queue *q, struct request *rq,
__elv_add_request(q, rq, where);
}
/**
* blk_insert_request - insert a special request into a request queue
* @q: request queue where request should be inserted
* @rq: request to be inserted
* @at_head: insert request at head or tail of queue
* @data: private data
*
* Description:
* Many block devices need to execute commands asynchronously, so they don't
* block the whole kernel from preemption during request execution. This is
* accomplished normally by inserting aritficial requests tagged as
* REQ_TYPE_SPECIAL in to the corresponding request queue, and letting them
* be scheduled for actual execution by the request queue.
*
* We have the option of inserting the head or the tail of the queue.
* Typically we use the tail for new ioctls and so forth. We use the head
* of the queue for things like a QUEUE_FULL message from a device, or a
* host that is unable to accept a particular command.
*/
void blk_insert_request(struct request_queue *q, struct request *rq,
int at_head, void *data)
{
int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
unsigned long flags;
/*
* tell I/O scheduler that this isn't a regular read/write (ie it
* must not attempt merges on this) and that it acts as a soft
* barrier
*/
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->special = data;
spin_lock_irqsave(q->queue_lock, flags);
/*
* If command is tagged, release the tag
*/
if (blk_rq_tagged(rq))
blk_queue_end_tag(q, rq);
add_acct_request(q, rq, where);
__blk_run_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
EXPORT_SYMBOL(blk_insert_request);
static void part_round_stats_single(int cpu, struct hd_struct *part,
unsigned long now)
{

12
drivers/block/sx8.c
View File

@ -619,8 +619,10 @@ static int carm_array_info (struct carm_host *host, unsigned int array_idx)
host->state == HST_DEV_SCAN);
spin_unlock_irq(&host->lock);
DPRINTK("blk_insert_request, tag == %u\n", idx);
blk_insert_request(host->oob_q, crq->rq, 1, crq);
DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
crq->rq->cmd_type = REQ_TYPE_SPECIAL;
crq->rq->special = crq;
blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
return 0;
@ -658,8 +660,10 @@ static int carm_send_special (struct carm_host *host, carm_sspc_t func)
BUG_ON(rc < 0);
crq->msg_bucket = (u32) rc;
DPRINTK("blk_insert_request, tag == %u\n", idx);
blk_insert_request(host->oob_q, crq->rq, 1, crq);
DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
crq->rq->cmd_type = REQ_TYPE_SPECIAL;
crq->rq->special = crq;
blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
return 0;
}

1
include/linux/blkdev.h
View File

@ -660,7 +660,6 @@ extern void __blk_put_request(struct request_queue *, struct request *);
extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
extern struct request *blk_make_request(struct request_queue *, struct bio *,
gfp_t);
extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
extern void blk_requeue_request(struct request_queue *, struct request *);
extern void blk_add_request_payload(struct request *rq, struct page *page,
unsigned int len);