Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 1 | /* |
| 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 Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 8 | #include <linux/blk-mq.h> |
Clark Williams | cf4aebc2 | 2013-02-07 09:46:59 -0600 | [diff] [blame] | 9 | #include <linux/sched/sysctl.h> |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 10 | |
| 11 | #include "blk.h" |
Jens Axboe | bd166ef | 2017-01-17 06:03:22 -0700 | [diff] [blame] | 12 | #include "blk-mq-sched.h" |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 13 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 14 | /** |
| 15 | * blk_end_sync_rq - executes a completion event on a request |
| 16 | * @rq: request to complete |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 17 | * @error: end I/O status of the request |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 18 | */ |
Christoph Hellwig | 2a842ac | 2017-06-03 09:38:04 +0200 | [diff] [blame] | 19 | static void blk_end_sync_rq(struct request *rq, blk_status_t error) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 20 | { |
| 21 | struct completion *waiting = rq->end_io_data; |
| 22 | |
| 23 | rq->end_io_data = NULL; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 24 | |
| 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 Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 31 | |
| 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 Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 41 | * Insert a fully prepared request at the back of the I/O scheduler queue |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 42 | * for execution. Don't wait for completion. |
Muthukumar Ratty | e81ca6f | 2012-06-29 15:31:49 +0000 | [diff] [blame] | 43 | * |
| 44 | * Note: |
| 45 | * This function will invoke @done directly if the queue is dead. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 46 | */ |
| 47 | void 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 Heo | 8ba6143 | 2011-12-14 00:33:37 +0100 | [diff] [blame] | 51 | WARN_ON(irqs_disabled()); |
Christoph Hellwig | 57292b5 | 2017-01-31 16:57:29 +0100 | [diff] [blame] | 52 | WARN_ON(!blk_rq_is_passthrough(rq)); |
James Bottomley | bfe159a | 2011-07-07 15:45:40 -0500 | [diff] [blame] | 53 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 54 | rq->rq_disk = bd_disk; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 55 | rq->end_io = done; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 56 | |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 57 | /* |
| 58 | * don't check dying flag for MQ because the request won't |
Bart Van Assche | 68bdf1a | 2016-07-19 08:18:06 -0700 | [diff] [blame] | 59 | * be reused after dying flag is set |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 60 | */ |
Jens Axboe | a1ce35f | 2018-10-29 10:23:51 -0600 | [diff] [blame] | 61 | blk_mq_sched_insert_request(rq, at_head, true, false); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 62 | } |
| 63 | EXPORT_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 Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 73 | * Insert a fully prepared request at the back of the I/O scheduler queue |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 74 | * for execution and wait for completion. |
| 75 | */ |
Christoph Hellwig | b7819b9 | 2017-04-20 16:02:55 +0200 | [diff] [blame] | 76 | void blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 77 | struct request *rq, int at_head) |
| 78 | { |
| 79 | DECLARE_COMPLETION_ONSTACK(wait); |
Mark Lord | 4b19776 | 2010-09-24 09:51:13 -0400 | [diff] [blame] | 80 | unsigned long hang_check; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 81 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 82 | rq->end_io_data = &wait; |
| 83 | blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq); |
Mark Lord | 4b19776 | 2010-09-24 09:51:13 -0400 | [diff] [blame] | 84 | |
| 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 Davydov | 5577022 | 2013-02-14 18:19:59 +0400 | [diff] [blame] | 88 | while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2))); |
Mark Lord | 4b19776 | 2010-09-24 09:51:13 -0400 | [diff] [blame] | 89 | else |
Vladimir Davydov | 5577022 | 2013-02-14 18:19:59 +0400 | [diff] [blame] | 90 | wait_for_completion_io(&wait); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 91 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 92 | EXPORT_SYMBOL(blk_execute_rq); |