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- // 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);
- /*
- * 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);
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