centos man page for __blk_drain_queue

__BLK_DRAIN_QUEUE(9)						   Block Devices					      __BLK_DRAIN_QUEUE(9)

NAME
       __blk_drain_queue - drain requests from request_queue

SYNOPSIS
       void __blk_drain_queue(struct request_queue * q, bool drain_all);

ARGUMENTS
       q
	   queue to drain

       drain_all
	   whether to drain all requests or only the ones w/ ELVPRIV

DESCRIPTION
       Drain requests from q. If drain_all is set, all requests are drained. If not, only ELVPRIV requests are drained. The caller is responsible
       for ensuring that no new requests which need to be drained are queued.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						      __BLK_DRAIN_QUEUE(9)