NFSv4: Fix up another delegation related race
When we can update_open_stateid(), we need to be certain that we don't
race with a delegation return. While we could do this by grabbing the
nfs_client->cl_lock, a dedicated spin lock in the delegation structure
will scale better.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index f1c5e2a..8299c62 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -22,6 +22,7 @@
long flags;
loff_t maxsize;
__u64 change_attr;
+ spinlock_t lock;
struct rcu_head rcu;
};