/* * 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>#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 * @error: end I/O status of the request */static void blk_end_sync_rq(struct request *rq, int error){ struct completion *waiting = rq->end_io_data; rq->end_io_data = NULL; __blk_put_request(rq->q, rq); /* * complete last, if this is a stack request the process (and thus * the rq pointer) could be invalid right after this complete() */ complete(waiting);}/** * 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: * Insert a fully prepared request at the back of the I/O scheduler queue * for execution. Don't wait for completion. */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; if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) { rq->errors = -ENXIO; if (rq->end_io) rq->end_io(rq, rq->errors); return; } rq->rq_disk = bd_disk; rq->end_io = done; WARN_ON(irqs_disabled()); spin_lock_irq(q->queue_lock); __elv_add_request(q, rq, where); __blk_run_queue(q); /* the queue is stopped so it won't be run */ if (rq->cmd_type == REQ_TYPE_PM_RESUME) q->request_fn(q); 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: * Insert a fully prepared request at the back of the I/O scheduler queue * 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; unsigned long hang_check; /* * we need an extra reference to the request, so we can look at * it after io completion */ rq->ref_count++; 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); /* Prevent hang_check timer from firing at us during very long I/O */ hang_check = sysctl_hung_task_timeout_secs; if (hang_check) while (!wait_for_completion_timeout(&wait, hang_check * (HZ/2))); else wait_for_completion(&wait); if (rq->errors) err = -EIO; return err;}EXPORT_SYMBOL(blk_execute_rq);
/*
* 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>
#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
* @error: end I/O status of the request
*/
static void blk_end_sync_rq(struct request *rq, int error)
{
struct completion *waiting = rq->end_io_data;
rq->end_io_data = NULL;
__blk_put_request(rq->q, rq);
/*
* complete last, if this is a stack request the process (and thus
* the rq pointer) could be invalid right after this complete()
*/
complete(waiting);
}
/**
* 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:
* Insert a fully prepared request at the back of the I/O scheduler queue
* for execution. Don't wait for completion.
*/
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;
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
rq->errors = -ENXIO;
if (rq->end_io)
rq->end_io(rq, rq->errors);
return;
}
rq->rq_disk = bd_disk;
rq->end_io = done;
WARN_ON(irqs_disabled());
spin_lock_irq(q->queue_lock);
__elv_add_request(q, rq, where);
__blk_run_queue(q);
/* the queue is stopped so it won't be run */
if (rq->cmd_type == REQ_TYPE_PM_RESUME)
q->request_fn(q);
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:
* Insert a fully prepared request at the back of the I/O scheduler queue
* 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;
unsigned long hang_check;
/*
* we need an extra reference to the request, so we can look at
* it after io completion
*/
rq->ref_count++;
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);
/* Prevent hang_check timer from firing at us during very long I/O */
hang_check = sysctl_hung_task_timeout_secs;
if (hang_check)
while (!wait_for_completion_timeout(&wait, hang_check * (HZ/2)));
else
wait_for_completion(&wait);
if (rq->errors)
err = -EIO;
return err;
}
EXPORT_SYMBOL(blk_execute_rq);