UPSTREAM: cifs: Check the IOCB_DIRECT flag, not O_DIRECT

[ Upstream commit 994fd530 ]

Use the IOCB_DIRECT indicator flag on the I/O context rather than checking to
see if the file was opened O_DIRECT.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: linux-cifs@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 7c48a6e6)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I37d1ff596eadca3a665148189efe51c692f43cca