blk_sync_queue man page on Oracle

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BLK_SYNC_QUEUE(9)		 Block Devices		     BLK_SYNC_QUEUE(9)

NAME
       blk_sync_queue - cancel any pending callbacks on a queue

SYNOPSIS
       void blk_sync_queue(struct request_queue * q);

ARGUMENTS
       q
	   the queue

DESCRIPTION
       The block layer may perform asynchronous callback activity on a queue,
       such as calling the unplug function after a timeout. A block device may
       call blk_sync_queue to ensure that any such activity is cancelled, thus
       allowing it to release resources that the callbacks might use. The
       caller must already have made sure that its ->make_request_fn will not
       re-add plugging prior to calling this function.

       This function does not cancel any asynchronous activity arising out of
       elevator or throttling code. That would require elevaotor_exit and
       blkcg_exit_queue to be called with queue lock initialized.

COPYRIGHT
Kernel Hackers Manual 3.8.	   June 2014		     BLK_SYNC_QUEUE(9)
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