[thirdparty/linux.git] / block / blk-exec.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Functions related to setting various queue properties from drivers
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/sched/sysctl.h>

#include "blk.h"
#include "blk-mq-sched.h"

/**
 * blk_end_sync_rq - executes a completion event on a request
 * @rq: request to complete
 * @error: end I/O status of the request
 */
static void blk_end_sync_rq(struct request *rq, blk_status_t error)
{
	struct completion *waiting = rq->end_io_data;

	rq->end_io_data = NULL;

	/*
	 * complete last, if this is a stack request the process (and thus
	 * the rq pointer) could be invalid right after this complete()
	 */
	complete(waiting);
}

/**
 * blk_execute_rq_nowait - insert a request into queue for execution
 * @q:		queue to insert the request in
 * @bd_disk:	matching gendisk
 * @rq:		request to insert
 * @at_head:    insert request at head or tail of queue
 * @done:	I/O completion handler
 *
 * Description:
 *    Insert a fully prepared request at the back of the I/O scheduler queue
 *    for execution.  Don't wait for completion.
 *
 * Note:
 *    This function will invoke @done directly if the queue is dead.
 */
void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
			   struct request *rq, int at_head,
			   rq_end_io_fn *done)
{
	WARN_ON(irqs_disabled());
	WARN_ON(!blk_rq_is_passthrough(rq));

	rq->rq_disk = bd_disk;
	rq->end_io = done;

	blk_account_io_start(rq, true);

	/*
	 * don't check dying flag for MQ because the request won't
	 * be reused after dying flag is set
	 */
	blk_mq_sched_insert_request(rq, at_head, true, false);
}
EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);

/**
 * blk_execute_rq - insert a request into queue for execution
 * @q:		queue to insert the request in
 * @bd_disk:	matching gendisk
 * @rq:		request to insert
 * @at_head:    insert request at head or tail of queue
 *
 * Description:
 *    Insert a fully prepared request at the back of the I/O scheduler queue
 *    for execution and wait for completion.
 */
void blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk,
		   struct request *rq, int at_head)
{
	DECLARE_COMPLETION_ONSTACK(wait);
	unsigned long hang_check;

	rq->end_io_data = &wait;
	blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq);

	/* Prevent hang_check timer from firing at us during very long I/O */
	hang_check = sysctl_hung_task_timeout_secs;
	if (hang_check)
		while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
	else
		wait_for_completion_io(&wait);
}
EXPORT_SYMBOL(blk_execute_rq);
Commit	Line	Data
3dcf60bc	1	// SPDX-License-Identifier: GPL-2.0
86db1e29 JA	2	/*
	3	* Functions related to setting various queue properties from drivers
	4	*/
	5	#include <linux/kernel.h>
	6	#include <linux/module.h>
	7	#include <linux/bio.h>
	8	#include <linux/blkdev.h>
320ae51f	9	#include <linux/blk-mq.h>
cf4aebc2	10	#include <linux/sched/sysctl.h>
86db1e29 JA	11
86db1e29 JA	12	#include "blk.h"
bd166ef1	13	#include "blk-mq-sched.h"
86db1e29	14
86db1e29 JA	15	/**
	16	* blk_end_sync_rq - executes a completion event on a request
	17	* @rq: request to complete
710027a4	18	* @error: end I/O status of the request
86db1e29	19	*/
2a842aca	20	static void blk_end_sync_rq(struct request *rq, blk_status_t error)
86db1e29 JA	21	{
	22	struct completion *waiting = rq->end_io_data;
	23
	24	rq->end_io_data = NULL;
86db1e29 JA	25
	26	/*
	27	* complete last, if this is a stack request the process (and thus
	28	* the rq pointer) could be invalid right after this complete()
	29	*/
	30	complete(waiting);
	31	}
86db1e29 JA	32
	33	/**
	34	* blk_execute_rq_nowait - insert a request into queue for execution
	35	* @q: queue to insert the request in
	36	* @bd_disk: matching gendisk
	37	* @rq: request to insert
	38	* @at_head: insert request at head or tail of queue
	39	* @done: I/O completion handler
	40	*
	41	* Description:
710027a4	42	* Insert a fully prepared request at the back of the I/O scheduler queue
86db1e29	43	* for execution. Don't wait for completion.
e81ca6fe MR	44	*
	45	* Note:
	46	* This function will invoke @done directly if the queue is dead.
86db1e29 JA	47	*/
	48	void blk_execute_rq_nowait(struct request_queue q, struct gendisk bd_disk,
	49	struct request *rq, int at_head,
	50	rq_end_io_fn *done)
	51	{
8ba61435	52	WARN_ON(irqs_disabled());
57292b58	53	WARN_ON(!blk_rq_is_passthrough(rq));
e81ca6fe MR	54
	55	rq->rq_disk = bd_disk;
	56	rq->end_io = done;
320ae51f	57
48d9b0d4 LG	58	blk_account_io_start(rq, true);
48d9b0d4 LG	59
43a5e4e2 ML	60	/*
43a5e4e2 ML	61	* don't check dying flag for MQ because the request won't
68bdf1ac	62	* be reused after dying flag is set
43a5e4e2	63	*/
a1ce35fa	64	blk_mq_sched_insert_request(rq, at_head, true, false);
86db1e29 JA	65	}
	66	EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
	67
	68	/**
	69	* blk_execute_rq - insert a request into queue for execution
	70	* @q: queue to insert the request in
	71	* @bd_disk: matching gendisk
	72	* @rq: request to insert
	73	* @at_head: insert request at head or tail of queue
	74	*
	75	* Description:
710027a4	76	* Insert a fully prepared request at the back of the I/O scheduler queue
86db1e29 JA	77	* for execution and wait for completion.
86db1e29 JA	78	*/
b7819b92	79	void blk_execute_rq(struct request_queue q, struct gendisk bd_disk,
86db1e29 JA	80	struct request *rq, int at_head)
	81	{
	82	DECLARE_COMPLETION_ONSTACK(wait);
4b197769	83	unsigned long hang_check;
86db1e29	84
86db1e29 JA	85	rq->end_io_data = &wait;
86db1e29 JA	86	blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq);
4b197769 ML	87
	88	/* Prevent hang_check timer from firing at us during very long I/O */
	89	hang_check = sysctl_hung_task_timeout_secs;
	90	if (hang_check)
5577022f	91	while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
4b197769	92	else
5577022f	93	wait_for_completion_io(&wait);
86db1e29	94	}
86db1e29	95	EXPORT_SYMBOL(blk_execute_rq);