[PATCH] NFS: Fix delayed delegation return list handling

The delayed delegation return handling added a separate
delegations_delayed list to keep delegations whose return needs to be
retried later. The delayed list is then spliced back to
delegations_return by nfs_server_clear_delayed_delegations(), which also
causes the state manager to retry the delegation return.

However, nfs_end_delegation_return() still moves delayed delegations to
delegations_return instead of delegations_delayed. As a result, the new
delayed list is never populated, nfs_server_clear_delayed_delegations()
always returns false, and NFS4CLNT_DELEGRETURN is not set again to drive
a retry.

Move delayed delegations to delegations_delayed so that the delayed
return path can splice them back to delegations_return and schedule the
retry as intended.

Fixes: 4039fbedcbcb ("NFS: fix delayed delegation return handling")
Signed-off-by: Guangshuo Li <[email protected]>
---
 fs/nfs/delegation.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 9546d2195c25..f65e0930ac9d 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -594,7 +594,7 @@ static int nfs_end_delegation_return(struct inode *inode,
 	spin_lock(&server->delegations_lock);
 	if (list_empty(&delegation->entry))
 		refcount_inc(&delegation->refcount);
-	list_move_tail(&delegation->entry, &server->delegations_return);
+	list_move_tail(&delegation->entry, &server->delegations_delayed);
 	spin_unlock(&server->delegations_lock);
 	set_bit(NFS4CLNT_DELEGRETURN_DELAYED, &server->nfs_client->cl_state);
 abort:
-- 
2.43.0