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 | */ |
FUJITA Tomonori | 681a561 | 2008-07-15 21:21:45 +0200 | [diff] [blame] | 19 | static void blk_end_sync_rq(struct request *rq, int 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 | { |
| 51 | int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK; |
| 52 | |
Tejun Heo | 8ba6143 | 2011-12-14 00:33:37 +0100 | [diff] [blame] | 53 | WARN_ON(irqs_disabled()); |
Christoph Hellwig | 57292b5 | 2017-01-31 16:57:29 +0100 | [diff] [blame] | 54 | WARN_ON(!blk_rq_is_passthrough(rq)); |
James Bottomley | bfe159a | 2011-07-07 15:45:40 -0500 | [diff] [blame] | 55 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 56 | rq->rq_disk = bd_disk; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 57 | rq->end_io = done; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 58 | |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 59 | /* |
| 60 | * 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] | 61 | * be reused after dying flag is set |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 62 | */ |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 63 | if (q->mq_ops) { |
Jens Axboe | bd6737f | 2017-01-27 01:00:47 -0700 | [diff] [blame] | 64 | blk_mq_sched_insert_request(rq, at_head, true, false, false); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 65 | return; |
| 66 | } |
| 67 | |
Muthukumar Ratty | e81ca6f | 2012-06-29 15:31:49 +0000 | [diff] [blame] | 68 | spin_lock_irq(q->queue_lock); |
| 69 | |
Bart Van Assche | 3f3299d | 2012-11-28 13:42:38 +0100 | [diff] [blame] | 70 | if (unlikely(blk_queue_dying(q))) { |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 71 | rq->rq_flags |= RQF_QUIET; |
Christoph Hellwig | caf7df1 | 2017-04-20 16:03:16 +0200 | [diff] [blame] | 72 | __blk_end_request_all(rq, -ENXIO); |
Muthukumar Ratty | e81ca6f | 2012-06-29 15:31:49 +0000 | [diff] [blame] | 73 | spin_unlock_irq(q->queue_lock); |
| 74 | return; |
| 75 | } |
| 76 | |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 77 | __elv_add_request(q, rq, where); |
Christoph Hellwig | 24ecfbe | 2011-04-18 11:41:33 +0200 | [diff] [blame] | 78 | __blk_run_queue(q); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 79 | spin_unlock_irq(q->queue_lock); |
| 80 | } |
| 81 | EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); |
| 82 | |
| 83 | /** |
| 84 | * blk_execute_rq - insert a request into queue for execution |
| 85 | * @q: queue to insert the request in |
| 86 | * @bd_disk: matching gendisk |
| 87 | * @rq: request to insert |
| 88 | * @at_head: insert request at head or tail of queue |
| 89 | * |
| 90 | * Description: |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 91 | * 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] | 92 | * for execution and wait for completion. |
| 93 | */ |
Christoph Hellwig | b7819b9 | 2017-04-20 16:02:55 +0200 | [diff] [blame] | 94 | void blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 95 | struct request *rq, int at_head) |
| 96 | { |
| 97 | DECLARE_COMPLETION_ONSTACK(wait); |
Mark Lord | 4b19776 | 2010-09-24 09:51:13 -0400 | [diff] [blame] | 98 | unsigned long hang_check; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 99 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 100 | rq->end_io_data = &wait; |
| 101 | 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] | 102 | |
| 103 | /* Prevent hang_check timer from firing at us during very long I/O */ |
| 104 | hang_check = sysctl_hung_task_timeout_secs; |
| 105 | if (hang_check) |
Vladimir Davydov | 5577022 | 2013-02-14 18:19:59 +0400 | [diff] [blame] | 106 | while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2))); |
Mark Lord | 4b19776 | 2010-09-24 09:51:13 -0400 | [diff] [blame] | 107 | else |
Vladimir Davydov | 5577022 | 2013-02-14 18:19:59 +0400 | [diff] [blame] | 108 | wait_for_completion_io(&wait); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 109 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 110 | EXPORT_SYMBOL(blk_execute_rq); |