5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
[ Upstream commit ed1cc05aa1f7fe8197d300e914afc28ab9818f89 ]
If the NFS4CLNT_RUN_MANAGER flag got set just before we cleared
NFS4CLNT_MANAGER_RUNNING, then we might have won the race against
nfs4_schedule_state_manager(), and are responsible for handling the
recovery situation.
Fixes: aeabb3c96186 ("NFSv4: Fix a NFSv4 state manager deadlock")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/nfs/nfs4state.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 04aa8e34d1129..1aacb0aa07f0c 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -2623,6 +2623,13 @@ static void nfs4_state_manager(struct nfs_client *clp)
nfs4_end_drain_session(clp);
nfs4_clear_state_manager_bit(clp);
+ if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
+ !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING,
+ &clp->cl_state)) {
+ memflags = memalloc_nofs_save();
+ continue;
+ }
+
if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) {
if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
nfs_client_return_marked_delegations(clp);
--
2.40.1
