blob: a34b7d9187426cbfe93bb5d8115da2b62fadd1fb [file] [log] [blame]
Jens Axboe86db1e22008-01-29 14:53:40 +01001/*
2 * Functions related to setting various queue properties from drivers
3 */
4#include <linux/kernel.h>
5#include <linux/module.h>
6#include <linux/bio.h>
7#include <linux/blkdev.h>
Jens Axboe320ae512013-10-24 09:20:05 +01008#include <linux/blk-mq.h>
Clark Williamscf4aebc22013-02-07 09:46:59 -06009#include <linux/sched/sysctl.h>
Jens Axboe86db1e22008-01-29 14:53:40 +010010
11#include "blk.h"
Jens Axboebd166ef2017-01-17 06:03:22 -070012#include "blk-mq-sched.h"
Jens Axboe86db1e22008-01-29 14:53:40 +010013
Jens Axboe86db1e22008-01-29 14:53:40 +010014/**
15 * blk_end_sync_rq - executes a completion event on a request
16 * @rq: request to complete
Randy Dunlap710027a2008-08-19 20:13:11 +020017 * @error: end I/O status of the request
Jens Axboe86db1e22008-01-29 14:53:40 +010018 */
Christoph Hellwig2a842ac2017-06-03 09:38:04 +020019static void blk_end_sync_rq(struct request *rq, blk_status_t error)
Jens Axboe86db1e22008-01-29 14:53:40 +010020{
21 struct completion *waiting = rq->end_io_data;
22
23 rq->end_io_data = NULL;
Jens Axboe86db1e22008-01-29 14:53:40 +010024
25 /*
26 * complete last, if this is a stack request the process (and thus
27 * the rq pointer) could be invalid right after this complete()
28 */
29 complete(waiting);
30}
Jens Axboe86db1e22008-01-29 14:53:40 +010031
32/**
33 * blk_execute_rq_nowait - insert a request into queue for execution
34 * @q: queue to insert the request in
35 * @bd_disk: matching gendisk
36 * @rq: request to insert
37 * @at_head: insert request at head or tail of queue
38 * @done: I/O completion handler
39 *
40 * Description:
Randy Dunlap710027a2008-08-19 20:13:11 +020041 * Insert a fully prepared request at the back of the I/O scheduler queue
Jens Axboe86db1e22008-01-29 14:53:40 +010042 * for execution. Don't wait for completion.
Muthukumar Rattye81ca6f2012-06-29 15:31:49 +000043 *
44 * Note:
45 * This function will invoke @done directly if the queue is dead.
Jens Axboe86db1e22008-01-29 14:53:40 +010046 */
47void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
48 struct request *rq, int at_head,
49 rq_end_io_fn *done)
50{
Tejun Heo8ba61432011-12-14 00:33:37 +010051 WARN_ON(irqs_disabled());
Christoph Hellwig57292b52017-01-31 16:57:29 +010052 WARN_ON(!blk_rq_is_passthrough(rq));
James Bottomleybfe159a2011-07-07 15:45:40 -050053
Jens Axboe86db1e22008-01-29 14:53:40 +010054 rq->rq_disk = bd_disk;
Jens Axboe86db1e22008-01-29 14:53:40 +010055 rq->end_io = done;
Jens Axboe320ae512013-10-24 09:20:05 +010056
Ming Lei43a5e4e2013-12-26 21:31:35 +080057 /*
58 * don't check dying flag for MQ because the request won't
Bart Van Assche68bdf1a2016-07-19 08:18:06 -070059 * be reused after dying flag is set
Ming Lei43a5e4e2013-12-26 21:31:35 +080060 */
Jens Axboea1ce35f2018-10-29 10:23:51 -060061 blk_mq_sched_insert_request(rq, at_head, true, false);
Jens Axboe86db1e22008-01-29 14:53:40 +010062}
63EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
64
65/**
66 * blk_execute_rq - insert a request into queue for execution
67 * @q: queue to insert the request in
68 * @bd_disk: matching gendisk
69 * @rq: request to insert
70 * @at_head: insert request at head or tail of queue
71 *
72 * Description:
Randy Dunlap710027a2008-08-19 20:13:11 +020073 * Insert a fully prepared request at the back of the I/O scheduler queue
Jens Axboe86db1e22008-01-29 14:53:40 +010074 * for execution and wait for completion.
75 */
Christoph Hellwigb7819b92017-04-20 16:02:55 +020076void blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk,
Jens Axboe86db1e22008-01-29 14:53:40 +010077 struct request *rq, int at_head)
78{
79 DECLARE_COMPLETION_ONSTACK(wait);
Mark Lord4b197762010-09-24 09:51:13 -040080 unsigned long hang_check;
Jens Axboe86db1e22008-01-29 14:53:40 +010081
Jens Axboe86db1e22008-01-29 14:53:40 +010082 rq->end_io_data = &wait;
83 blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq);
Mark Lord4b197762010-09-24 09:51:13 -040084
85 /* Prevent hang_check timer from firing at us during very long I/O */
86 hang_check = sysctl_hung_task_timeout_secs;
87 if (hang_check)
Vladimir Davydov55770222013-02-14 18:19:59 +040088 while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
Mark Lord4b197762010-09-24 09:51:13 -040089 else
Vladimir Davydov55770222013-02-14 18:19:59 +040090 wait_for_completion_io(&wait);
Jens Axboe86db1e22008-01-29 14:53:40 +010091}
Jens Axboe86db1e22008-01-29 14:53:40 +010092EXPORT_SYMBOL(blk_execute_rq);