BLK_QUEUE_ORDERED(9) Block Devices BLK_QUEUE_ORDERED(9)
NAME blk_queue_ordered - does this queue support ordered writes
SYNOPSIS int blk_queue_ordered(struct request_queue * q, unsigned ordered, prepare_flush_fn * prepare_flush_fn);
ARGUMENTS q the request queue
ordered one of QUEUE_ORDERED_*
prepare_flush_fn rq setup helper for cache flush ordered writes
DESCRIPTION For journalled file systems, doing ordered writes on a commit block instead of explicitly doing wait_on_buffer (which is bad for performance) can be a big win. Block drivers supporting this feature should call this function and indicate so.
COPYRIGHT Kernel Hackers Manual 2.6. September 2010 BLK_QUEUE_ORDERED(9)