[PATCH 5.13 200/300] nfsd4: Fix forced-expiry locking

Greg Kroah-Hartman
2021-09-13T14:15:06Z

From: J. Bruce Fields <bfields@redhat.com>

[ Upstream commit f7104cc1a9159cd0d3e8526cb638ae0301de4b61 ]

This should use the network-namespace-wide client_lock, not the
per-client cl_lock.

You shouldn't see any bugs unless you're actually using the
forced-expiry interface introduced by 89c905beccbb.

Fixes: 89c905beccbb "nfsd: allow forced expiration of NFSv4 clients"
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/nfsd/nfs4state.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 90e81f6491ff..ab81e8ae3265 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2665,9 +2665,9 @@ static void force_expire_client(struct nfs4_client *clp)
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
bool already_expired;

- spin_lock(&clp->cl_lock);
+ spin_lock(&nn->client_lock);
clp->cl_time = 0;
- spin_unlock(&clp->cl_lock);
+ spin_unlock(&nn->client_lock);

wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
spin_lock(&nn->client_lock);
--
2.30.2