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Christoph Hellwig3dcf60bc2019-04-30 14:42:43 -04001// SPDX-License-Identifier: GPL-2.0
Jens Axboe86db1e22008-01-29 14:53:40 +01002/*
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>
Jens Axboe320ae512013-10-24 09:20:05 +01009#include <linux/blk-mq.h>
Clark Williamscf4aebc22013-02-07 09:46:59 -060010#include <linux/sched/sysctl.h>
Jens Axboe86db1e22008-01-29 14:53:40 +010011
12#include "blk.h"
Jens Axboebd166ef2017-01-17 06:03:22 -070013#include "blk-mq-sched.h"
Jens Axboe86db1e22008-01-29 14:53:40 +010014
Jens Axboe86db1e22008-01-29 14:53:40 +010015/**
16 * blk_end_sync_rq - executes a completion event on a request
17 * @rq: request to complete
Randy Dunlap710027a2008-08-19 20:13:11 +020018 * @error: end I/O status of the request
Jens Axboe86db1e22008-01-29 14:53:40 +010019 */
Christoph Hellwig2a842ac2017-06-03 09:38:04 +020020static void blk_end_sync_rq(struct request *rq, blk_status_t error)
Jens Axboe86db1e22008-01-29 14:53:40 +010021{
22 struct completion *waiting = rq->end_io_data;
23
24 rq->end_io_data = NULL;
Jens Axboe86db1e22008-01-29 14:53:40 +010025
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}
Jens Axboe86db1e22008-01-29 14:53:40 +010032
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:
Randy Dunlap710027a2008-08-19 20:13:11 +020042 * Insert a fully prepared request at the back of the I/O scheduler queue
Jens Axboe86db1e22008-01-29 14:53:40 +010043 * for execution. Don't wait for completion.
Muthukumar Rattye81ca6f2012-06-29 15:31:49 +000044 *
45 * Note:
46 * This function will invoke @done directly if the queue is dead.
Jens Axboe86db1e22008-01-29 14:53:40 +010047 */
48void 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{
Tejun Heo8ba61432011-12-14 00:33:37 +010052 WARN_ON(irqs_disabled());
Christoph Hellwig57292b52017-01-31 16:57:29 +010053 WARN_ON(!blk_rq_is_passthrough(rq));
James Bottomleybfe159a2011-07-07 15:45:40 -050054
Jens Axboe86db1e22008-01-29 14:53:40 +010055 rq->rq_disk = bd_disk;
Jens Axboe86db1e22008-01-29 14:53:40 +010056 rq->end_io = done;
Jens Axboe320ae512013-10-24 09:20:05 +010057
Ming Lei43a5e4e2013-12-26 21:31:35 +080058 /*
59 * don't check dying flag for MQ because the request won't
Bart Van Assche68bdf1a2016-07-19 08:18:06 -070060 * be reused after dying flag is set
Ming Lei43a5e4e2013-12-26 21:31:35 +080061 */
Jens Axboea1ce35f2018-10-29 10:23:51 -060062 blk_mq_sched_insert_request(rq, at_head, true, false);
Jens Axboe86db1e22008-01-29 14:53:40 +010063}
64EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
65
66/**
67 * blk_execute_rq - insert a request into queue for execution
68 * @q: queue to insert the request in
69 * @bd_disk: matching gendisk
70 * @rq: request to insert
71 * @at_head: insert request at head or tail of queue
72 *
73 * Description:
Randy Dunlap710027a2008-08-19 20:13:11 +020074 * Insert a fully prepared request at the back of the I/O scheduler queue
Jens Axboe86db1e22008-01-29 14:53:40 +010075 * for execution and wait for completion.
76 */
Christoph Hellwigb7819b92017-04-20 16:02:55 +020077void blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk,
Jens Axboe86db1e22008-01-29 14:53:40 +010078 struct request *rq, int at_head)
79{
80 DECLARE_COMPLETION_ONSTACK(wait);
Mark Lord4b197762010-09-24 09:51:13 -040081 unsigned long hang_check;
Jens Axboe86db1e22008-01-29 14:53:40 +010082
Jens Axboe86db1e22008-01-29 14:53:40 +010083 rq->end_io_data = &wait;
84 blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq);
Mark Lord4b197762010-09-24 09:51:13 -040085
86 /* Prevent hang_check timer from firing at us during very long I/O */
87 hang_check = sysctl_hung_task_timeout_secs;
88 if (hang_check)
Vladimir Davydov55770222013-02-14 18:19:59 +040089 while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
Mark Lord4b197762010-09-24 09:51:13 -040090 else
Vladimir Davydov55770222013-02-14 18:19:59 +040091 wait_for_completion_io(&wait);
Jens Axboe86db1e22008-01-29 14:53:40 +010092}
Jens Axboe86db1e22008-01-29 14:53:40 +010093EXPORT_SYMBOL(blk_execute_rq);