nfsd: Don't require client_lock in free_client

The struct nfs_client is supposed to be invisible and unreferenced
before it gets here.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a374592..256e903 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1416,9 +1416,6 @@ static void __free_session(struct nfsd4_session *ses)
 
 static void free_session(struct nfsd4_session *ses)
 {
-       struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
-
-       lockdep_assert_held(&nn->client_lock);
        nfsd4_del_conns(ses);
        nfsd4_put_drc_mem(&ses->se_fchannel);
        __free_session(ses);
@@ -1568,9 +1565,6 @@ err_no_name:
 static void
 free_client(struct nfs4_client *clp)
 {
-       struct nfsd_net __maybe_unused *nn = net_generic(clp->net, nfsd_net_id);
-
-       lockdep_assert_held(&nn->client_lock);
        while (!list_empty(&clp->cl_sessions)) {
                struct nfsd4_session *ses;
                ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
@@ -1627,7 +1621,6 @@ __destroy_client(struct nfs4_client *clp)
        struct nfs4_openowner *oo;
        struct nfs4_delegation *dp;
        struct list_head reaplist;
-       struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 
        INIT_LIST_HEAD(&reaplist);
        spin_lock(&state_lock);
@@ -1655,10 +1648,7 @@ __destroy_client(struct nfs4_client *clp)
        nfsd4_shutdown_callback(clp);
        if (clp->cl_cb_conn.cb_xprt)
                svc_xprt_put(clp->cl_cb_conn.cb_xprt);
-       spin_lock(&nn->client_lock);
-       WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
        free_client(clp);
-       spin_unlock(&nn->client_lock);
 }
 
 static void
@@ -1862,7 +1852,6 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
        struct sockaddr *sa = svc_addr(rqstp);
        int ret;
        struct net *net = SVC_NET(rqstp);
-       struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
        clp = alloc_client(name);
        if (clp == NULL)
@@ -1870,9 +1859,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
 
        ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
        if (ret) {
-               spin_lock(&nn->client_lock);
                free_client(clp);
-               spin_unlock(&nn->client_lock);
                return NULL;
        }
        INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_run_cb_null);