ceph: fix fscache invalidation

stable inclusion
from stable-5.10.39
commit 2783c34d54309ed88e2960b230fa75db301beefe
bugzilla: 51881
CVE: NA

--------------------------------

[ Upstream commit 10a7052c ]

Ensure that we invalidate the fscache whenever we invalidate the
pagecache.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>