This function just has a few trivial assignments, has two callers with
one of them being in the fastpath.
Reviewed-by: NHannes Reinecke <hare@suse.com>
Reviewed-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>