cifs: Check the IOCB_DIRECT flag, not O_DIRECT

stable inclusion
from stable-v5.10.113
commit 5bef9fc38ffa3e0a712fcd1e07f4f123ba160242
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5ISAH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5bef9fc38ffa3e0a712fcd1e07f4f123ba160242



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[ 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>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>