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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-08-01 18:31:32 (GMT) |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-08-01 18:31:32 (GMT) |
| commit | 6c5e0c4d518a37e1d5d794c14433e80284415079 (patch) | |
| tree | 26208a4fe4115a37c000a13d50df8c1a5e393553 | |
| parent | 94ad374a0751f40d25e22e036c37f7263569d24c (diff) | |
| download | linux-6c5e0c4d518a37e1d5d794c14433e80284415079.tar.xz | |
block: add a blk_plug_device_unlocked() that grabs the queue lock
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>
| -rw-r--r-- | block/blk-core.c | 18 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 1 |
2 files changed, 19 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index fef79cc..4889eb8 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -212,6 +212,24 @@ void blk_plug_device(struct request_queue *q) } 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 * queue lock held and interrupts disabled. diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 88d6808..e61f22b 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -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_requeue_request(struct request_queue *, struct request *); 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 void blk_recount_segments(struct request_queue *, struct bio *); extern int scsi_cmd_ioctl(struct file *, struct request_queue *, |