NFSv4.1: Fix a refcounting issue in the pNFS device id cache

When we add something to the global device id cache, we need to bump the
reference count, so that the cache itself holds a reference.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/pnfs_dev.c b/fs/nfs/pnfs_dev.c
index 5944d4b369a2f5707e98acd01252178bd69c1ebf..f0f8e1e22f6c945119ff359491dce07b79a0cf69 100644 (file)
--- a/fs/nfs/pnfs_dev.c
+++ b/fs/nfs/pnfs_dev.c
@@ -209,6 +209,7 @@ nfs4_insert_deviceid_node(struct nfs4_deviceid_node *new)
 
        hlist_add_head_rcu(&new->node, &nfs4_deviceid_cache[hash]);
        spin_unlock(&nfs4_deviceid_lock);
+       atomic_inc(&new->ref);
 
        return new;
 }