Blame view
block/blk-exec.c
3.2 KB
86db1e297 block: continue l... |
1 2 3 4 5 6 7 |
/* * 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> |
320ae51fe blk-mq: new multi... |
8 |
#include <linux/blk-mq.h> |
cf4aebc29 sched: Move sched... |
9 |
#include <linux/sched/sysctl.h> |
86db1e297 block: continue l... |
10 11 12 13 14 15 16 17 18 19 20 |
#include "blk.h" /* * for max sense size */ #include <scsi/scsi_cmnd.h> /** * blk_end_sync_rq - executes a completion event on a request * @rq: request to complete |
710027a48 Add some block/ s... |
21 |
* @error: end I/O status of the request |
86db1e297 block: continue l... |
22 |
*/ |
681a561b7 block: unexport b... |
23 |
static void blk_end_sync_rq(struct request *rq, int error) |
86db1e297 block: continue l... |
24 25 26 27 |
{ struct completion *waiting = rq->end_io_data; rq->end_io_data = NULL; |
86db1e297 block: continue l... |
28 29 30 31 32 33 34 |
/* * complete last, if this is a stack request the process (and thus * the rq pointer) could be invalid right after this complete() */ complete(waiting); } |
86db1e297 block: continue l... |
35 36 37 38 39 40 41 42 43 44 |
/** * 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: |
710027a48 Add some block/ s... |
45 |
* Insert a fully prepared request at the back of the I/O scheduler queue |
86db1e297 block: continue l... |
46 |
* for execution. Don't wait for completion. |
e81ca6fe8 [SCSI] block: Fix... |
47 48 49 |
* * Note: * This function will invoke @done directly if the queue is dead. |
86db1e297 block: continue l... |
50 51 52 53 54 55 |
*/ 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; |
8ba61435d block: add missin... |
56 |
WARN_ON(irqs_disabled()); |
a57a178a4 blk-mq: avoid inf... |
57 |
WARN_ON(rq->cmd_type == REQ_TYPE_FS); |
e81ca6fe8 [SCSI] block: Fix... |
58 59 60 |
rq->rq_disk = bd_disk; rq->end_io = done; |
320ae51fe blk-mq: new multi... |
61 |
|
43a5e4e21 block: blk-mq: su... |
62 63 |
/* * don't check dying flag for MQ because the request won't |
68bdf1ac2 block: Fix spelli... |
64 |
* be reused after dying flag is set |
43a5e4e21 block: blk-mq: su... |
65 |
*/ |
320ae51fe blk-mq: new multi... |
66 |
if (q->mq_ops) { |
feb71dae1 blk-mq: merge blk... |
67 |
blk_mq_insert_request(rq, at_head, true, false); |
320ae51fe blk-mq: new multi... |
68 69 |
return; } |
8ba61435d block: add missin... |
70 |
spin_lock_irq(q->queue_lock); |
3f3299d5c block: Rename que... |
71 |
if (unlikely(blk_queue_dying(q))) { |
7652113c2 If the queue is d... |
72 |
rq->cmd_flags |= REQ_QUIET; |
bfe159a51 [SCSI] fix crash ... |
73 |
rq->errors = -ENXIO; |
7652113c2 If the queue is d... |
74 |
__blk_end_request_all(rq, rq->errors); |
e81ca6fe8 [SCSI] block: Fix... |
75 |
spin_unlock_irq(q->queue_lock); |
bfe159a51 [SCSI] fix crash ... |
76 77 |
return; } |
7eaceacca block: remove per... |
78 |
__elv_add_request(q, rq, where); |
24ecfbe27 block: add blk_ru... |
79 |
__blk_run_queue(q); |
86db1e297 block: continue l... |
80 81 82 83 84 85 86 87 88 89 90 91 |
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: |
710027a48 Add some block/ s... |
92 |
* Insert a fully prepared request at the back of the I/O scheduler queue |
86db1e297 block: continue l... |
93 94 95 96 97 98 99 100 |
* for execution and wait for completion. */ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, struct request *rq, int at_head) { DECLARE_COMPLETION_ONSTACK(wait); char sense[SCSI_SENSE_BUFFERSIZE]; int err = 0; |
4b1977698 block: Prevent ha... |
101 |
unsigned long hang_check; |
86db1e297 block: continue l... |
102 |
|
86db1e297 block: continue l... |
103 104 105 106 107 108 109 110 |
if (!rq->sense) { memset(sense, 0, sizeof(sense)); rq->sense = sense; rq->sense_len = 0; } rq->end_io_data = &wait; blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq); |
4b1977698 block: Prevent ha... |
111 112 113 114 |
/* Prevent hang_check timer from firing at us during very long I/O */ hang_check = sysctl_hung_task_timeout_secs; if (hang_check) |
5577022f4 block: account io... |
115 |
while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2))); |
4b1977698 block: Prevent ha... |
116 |
else |
5577022f4 block: account io... |
117 |
wait_for_completion_io(&wait); |
86db1e297 block: continue l... |
118 119 120 |
if (rq->errors) err = -EIO; |
de83953f9 block: blk-exec.c... |
121 122 123 124 |
if (rq->sense == sense) { rq->sense = NULL; rq->sense_len = 0; } |
86db1e297 block: continue l... |
125 126 |
return err; } |
86db1e297 block: continue l... |
127 |
EXPORT_SYMBOL(blk_execute_rq); |