2 * Functions related to setting various queue properties from drivers
4 #include <linux/kernel.h>
5 #include <linux/module.h>
7 #include <linux/blkdev.h>
14 #include <scsi/scsi_cmnd.h>
17 * blk_end_sync_rq - executes a completion event on a request
18 * @rq: request to complete
19 * @error: end I/O status of the request
21 static void blk_end_sync_rq(struct request
*rq
, int error
)
23 struct completion
*waiting
= rq
->end_io_data
;
25 rq
->end_io_data
= NULL
;
26 __blk_put_request(rq
->q
, rq
);
29 * complete last, if this is a stack request the process (and thus
30 * the rq pointer) could be invalid right after this complete()
36 * blk_execute_rq_nowait - insert a request into queue for execution
37 * @q: queue to insert the request in
38 * @bd_disk: matching gendisk
39 * @rq: request to insert
40 * @at_head: insert request at head or tail of queue
41 * @done: I/O completion handler
44 * Insert a fully prepared request at the back of the I/O scheduler queue
45 * for execution. Don't wait for completion.
47 void blk_execute_rq_nowait(struct request_queue
*q
, struct gendisk
*bd_disk
,
48 struct request
*rq
, int at_head
,
51 int where
= at_head
? ELEVATOR_INSERT_FRONT
: ELEVATOR_INSERT_BACK
;
53 rq
->rq_disk
= bd_disk
;
54 rq
->cmd_flags
|= REQ_NOMERGE
;
56 WARN_ON(irqs_disabled());
57 spin_lock_irq(q
->queue_lock
);
58 __elv_add_request(q
, rq
, where
, 1);
59 __generic_unplug_device(q
);
60 /* the queue is stopped so it won't be plugged+unplugged */
61 if (blk_pm_resume_request(rq
))
63 spin_unlock_irq(q
->queue_lock
);
65 EXPORT_SYMBOL_GPL(blk_execute_rq_nowait
);
68 * blk_execute_rq - insert a request into queue for execution
69 * @q: queue to insert the request in
70 * @bd_disk: matching gendisk
71 * @rq: request to insert
72 * @at_head: insert request at head or tail of queue
75 * Insert a fully prepared request at the back of the I/O scheduler queue
76 * for execution and wait for completion.
78 int blk_execute_rq(struct request_queue
*q
, struct gendisk
*bd_disk
,
79 struct request
*rq
, int at_head
)
81 DECLARE_COMPLETION_ONSTACK(wait
);
82 char sense
[SCSI_SENSE_BUFFERSIZE
];
86 * we need an extra reference to the request, so we can look at
87 * it after io completion
92 memset(sense
, 0, sizeof(sense
));
97 rq
->end_io_data
= &wait
;
98 blk_execute_rq_nowait(q
, bd_disk
, rq
, at_head
, blk_end_sync_rq
);
99 wait_for_completion(&wait
);
106 EXPORT_SYMBOL(blk_execute_rq
);
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