xfs: flag as supporting FOP_UNCACHED

Read side was already fully supported, for the write side all that's
needed now is calling generic_uncached_write() when uncached writes
have been submitted. With that, enable the use of RWF_UNCACHED with XFS
by flagging support with FOP_UNCACHED.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed