mainline inclusion
from mainline-5.7-rc1
commit 65286b88
category: bugfix
bugzilla: 51800
CVE: NA

-------------------------------------------------
If the rpc.mountd daemon goes down, then that should not cause all
exports to start failing with ESTALE errors. Let's explicitly
distinguish between the cache upcall cases that need to time out,
and those that do not.
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: NChuck Lever <chuck.lever@oracle.com>
(cherry picked from commit 65286b88)
Signed-off-by: NYufen Wang <wangyufen@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>