Commit | Line | Data |
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86db1e29 JA |
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> | |
320ae51f | 8 | #include <linux/blk-mq.h> |
cf4aebc2 | 9 | #include <linux/sched/sysctl.h> |
86db1e29 JA |
10 | |
11 | #include "blk.h" | |
bd166ef1 | 12 | #include "blk-mq-sched.h" |
86db1e29 JA |
13 | |
14 | /* | |
15 | * for max sense size | |
16 | */ | |
17 | #include <scsi/scsi_cmnd.h> | |
18 | ||
19 | /** | |
20 | * blk_end_sync_rq - executes a completion event on a request | |
21 | * @rq: request to complete | |
710027a4 | 22 | * @error: end I/O status of the request |
86db1e29 | 23 | */ |
681a561b | 24 | static void blk_end_sync_rq(struct request *rq, int error) |
86db1e29 JA |
25 | { |
26 | struct completion *waiting = rq->end_io_data; | |
27 | ||
28 | rq->end_io_data = NULL; | |
86db1e29 JA |
29 | |
30 | /* | |
31 | * complete last, if this is a stack request the process (and thus | |
32 | * the rq pointer) could be invalid right after this complete() | |
33 | */ | |
34 | complete(waiting); | |
35 | } | |
86db1e29 JA |
36 | |
37 | /** | |
38 | * blk_execute_rq_nowait - insert a request into queue for execution | |
39 | * @q: queue to insert the request in | |
40 | * @bd_disk: matching gendisk | |
41 | * @rq: request to insert | |
42 | * @at_head: insert request at head or tail of queue | |
43 | * @done: I/O completion handler | |
44 | * | |
45 | * Description: | |
710027a4 | 46 | * Insert a fully prepared request at the back of the I/O scheduler queue |
86db1e29 | 47 | * for execution. Don't wait for completion. |
e81ca6fe MR |
48 | * |
49 | * Note: | |
50 | * This function will invoke @done directly if the queue is dead. | |
86db1e29 JA |
51 | */ |
52 | void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, | |
53 | struct request *rq, int at_head, | |
54 | rq_end_io_fn *done) | |
55 | { | |
56 | int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK; | |
57 | ||
8ba61435 | 58 | WARN_ON(irqs_disabled()); |
a57a178a | 59 | WARN_ON(rq->cmd_type == REQ_TYPE_FS); |
e81ca6fe MR |
60 | |
61 | rq->rq_disk = bd_disk; | |
62 | rq->end_io = done; | |
320ae51f | 63 | |
43a5e4e2 ML |
64 | /* |
65 | * don't check dying flag for MQ because the request won't | |
68bdf1ac | 66 | * be reused after dying flag is set |
43a5e4e2 | 67 | */ |
320ae51f | 68 | if (q->mq_ops) { |
bd6737f1 | 69 | blk_mq_sched_insert_request(rq, at_head, true, false, false); |
320ae51f JA |
70 | return; |
71 | } | |
72 | ||
8ba61435 TH |
73 | spin_lock_irq(q->queue_lock); |
74 | ||
3f3299d5 | 75 | if (unlikely(blk_queue_dying(q))) { |
e8064021 | 76 | rq->rq_flags |= RQF_QUIET; |
bfe159a5 | 77 | rq->errors = -ENXIO; |
7652113c | 78 | __blk_end_request_all(rq, rq->errors); |
e81ca6fe | 79 | spin_unlock_irq(q->queue_lock); |
bfe159a5 JB |
80 | return; |
81 | } | |
82 | ||
7eaceacc | 83 | __elv_add_request(q, rq, where); |
24ecfbe2 | 84 | __blk_run_queue(q); |
86db1e29 JA |
85 | spin_unlock_irq(q->queue_lock); |
86 | } | |
87 | EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); | |
88 | ||
89 | /** | |
90 | * blk_execute_rq - insert a request into queue for execution | |
91 | * @q: queue to insert the request in | |
92 | * @bd_disk: matching gendisk | |
93 | * @rq: request to insert | |
94 | * @at_head: insert request at head or tail of queue | |
95 | * | |
96 | * Description: | |
710027a4 | 97 | * Insert a fully prepared request at the back of the I/O scheduler queue |
86db1e29 JA |
98 | * for execution and wait for completion. |
99 | */ | |
100 | int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, | |
101 | struct request *rq, int at_head) | |
102 | { | |
103 | DECLARE_COMPLETION_ONSTACK(wait); | |
104 | char sense[SCSI_SENSE_BUFFERSIZE]; | |
105 | int err = 0; | |
4b197769 | 106 | unsigned long hang_check; |
86db1e29 | 107 | |
86db1e29 JA |
108 | if (!rq->sense) { |
109 | memset(sense, 0, sizeof(sense)); | |
110 | rq->sense = sense; | |
111 | rq->sense_len = 0; | |
112 | } | |
113 | ||
114 | rq->end_io_data = &wait; | |
115 | blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq); | |
4b197769 ML |
116 | |
117 | /* Prevent hang_check timer from firing at us during very long I/O */ | |
118 | hang_check = sysctl_hung_task_timeout_secs; | |
119 | if (hang_check) | |
5577022f | 120 | while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2))); |
4b197769 | 121 | else |
5577022f | 122 | wait_for_completion_io(&wait); |
86db1e29 JA |
123 | |
124 | if (rq->errors) | |
125 | err = -EIO; | |
126 | ||
de83953f RS |
127 | if (rq->sense == sense) { |
128 | rq->sense = NULL; | |
129 | rq->sense_len = 0; | |
130 | } | |
131 | ||
86db1e29 JA |
132 | return err; |
133 | } | |
86db1e29 | 134 | EXPORT_SYMBOL(blk_execute_rq); |