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block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop 

It doesn't make sense to enable merge because the I/O
submitted to backing file is handled page by page.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2015-08-17 10:31:47 +08:00 committed by Jens Axboe
parent 53cbf3b157
commit 5b5e20f421
1 changed files with 6 additions and 0 deletions
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6
drivers/block/loop.c
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@ -1595,6 +1595,12 @@ static int loop_add(struct loop_device **l, int i)
}
lo->lo_queue->queuedata = lo;
/*
* It doesn't make sense to enable merge because the I/O
* submitted to backing file is handled page by page.
*/
queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, lo->lo_queue);
INIT_LIST_HEAD(&lo->write_cmd_head);
INIT_WORK(&lo->write_work, loop_queue_write_work);