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block: add a blk_plug_device_unlocked() that grabs the queue lock

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blk_plug_device() must be called with the queue lock held, so callers
often just grab and release the lock for that purpose. Add a helper
that does just that.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2008-08-01 20:31:32 +02:00
parent 94ad374a07
commit 6c5e0c4d51
2 changed files with 19 additions and 0 deletions
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18
block/blk-core.c
View File

@@ -212,6 +212,24 @@ void blk_plug_device(struct request_queue *q)
} }
EXPORT_SYMBOL(blk_plug_device); EXPORT_SYMBOL(blk_plug_device);
/**
* blk_plug_device_unlocked - plug a device without queue lock held
* @q: The &struct request_queue to plug
*
* Description:
* Like @blk_plug_device(), but grabs the queue lock and disables
* interrupts.
**/
void blk_plug_device_unlocked(struct request_queue *q)
{
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
blk_plug_device(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
EXPORT_SYMBOL(blk_plug_device_unlocked);
/* /*
* remove the queue from the plugged list, if present. called with * remove the queue from the plugged list, if present. called with
* queue lock held and interrupts disabled. * queue lock held and interrupts disabled.

1
include/linux/blkdev.h
View File

@@ -655,6 +655,7 @@ extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
extern void blk_insert_request(struct request_queue *, struct request *, int, void *); extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
extern void blk_requeue_request(struct request_queue *, struct request *); extern void blk_requeue_request(struct request_queue *, struct request *);
extern void blk_plug_device(struct request_queue *); extern void blk_plug_device(struct request_queue *);
extern void blk_plug_device_unlocked(struct request_queue *);
extern int blk_remove_plug(struct request_queue *); extern int blk_remove_plug(struct request_queue *);
extern void blk_recount_segments(struct request_queue *, struct bio *); extern void blk_recount_segments(struct request_queue *, struct bio *);
extern int scsi_cmd_ioctl(struct file *, struct request_queue *, extern int scsi_cmd_ioctl(struct file *, struct request_queue *,