Contributors: 13
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jens Axboe |
191 |
62.83% |
4 |
17.39% |
| Mark Lord |
31 |
10.20% |
1 |
4.35% |
| Muthukumar Ratty |
20 |
6.58% |
1 |
4.35% |
| Christoph Hellwig |
18 |
5.92% |
7 |
30.43% |
| James Bottomley |
17 |
5.59% |
1 |
4.35% |
| Tejun Heo |
13 |
4.28% |
1 |
4.35% |
| Clark Williams |
3 |
0.99% |
1 |
4.35% |
| Michael Christie |
3 |
0.99% |
1 |
4.35% |
| Vladimir Davydov |
2 |
0.66% |
1 |
4.35% |
| Randy Dunlap |
2 |
0.66% |
1 |
4.35% |
| Bart Van Assche |
2 |
0.66% |
2 |
8.70% |
| FUJITA Tomonori |
1 |
0.33% |
1 |
4.35% |
| Bartlomiej Zolnierkiewicz |
1 |
0.33% |
1 |
4.35% |
| Total |
304 |
|
23 |
|
/*
* 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)
{
int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
WARN_ON(irqs_disabled());
WARN_ON(!blk_rq_is_passthrough(rq));
rq->rq_disk = bd_disk;
rq->end_io = done;
/*
* don't check dying flag for MQ because the request won't
* be reused after dying flag is set
*/
if (q->mq_ops) {
blk_mq_sched_insert_request(rq, at_head, true, false);
return;
}
spin_lock_irq(q->queue_lock);
if (unlikely(blk_queue_dying(q))) {
rq->rq_flags |= RQF_QUIET;
__blk_end_request_all(rq, BLK_STS_IOERR);
spin_unlock_irq(q->queue_lock);
return;
}
__elv_add_request(q, rq, where);
__blk_run_queue(q);
spin_unlock_irq(q->queue_lock);
}
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);