stable inclusion
from linux-4.19.118
commit b38f7532eb1549a43bcc8dfd6c197adccfa84a00

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

[ Upstream commit 862f35c9 ]

If we just set the mirror count to 1 without first clearing out
the mirrors, we can leak queued up requests.
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>