NFS implement v4.0 callback_ident
Use the small id to pointer translator service to provide a unique callback
identifier per SETCLIENTID call used to identify the v4.0 callback service
associated with the clientid.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 855add6..bc3a862 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -56,6 +56,30 @@
static LIST_HEAD(nfs_client_list);
static LIST_HEAD(nfs_volume_list);
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
+#ifdef CONFIG_NFS_V4
+static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */
+
+/*
+ * Get a unique NFSv4.0 callback identifier which will be used
+ * by the V4.0 callback service to lookup the nfs_client struct
+ */
+static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
+{
+ int ret = 0;
+
+ if (clp->rpc_ops->version != 4 || minorversion != 0)
+ return ret;
+retry:
+ if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL))
+ return -ENOMEM;
+ spin_lock(&nfs_client_lock);
+ ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident);
+ spin_unlock(&nfs_client_lock);
+ if (ret == -EAGAIN)
+ goto retry;
+ return ret;
+}
+#endif /* CONFIG_NFS_V4 */
/*
* RPC cruft for NFS
@@ -144,6 +168,10 @@
clp->cl_proto = cl_init->proto;
#ifdef CONFIG_NFS_V4
+ err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
+ if (err)
+ goto error_cleanup;
+
INIT_LIST_HEAD(&clp->cl_delegations);
spin_lock_init(&clp->cl_lock);
INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
@@ -202,10 +230,32 @@
rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
}
+
+/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
+void nfs_cleanup_cb_ident_idr(void)
+{
+ idr_destroy(&cb_ident_idr);
+}
+
+/* nfs_client_lock held */
+static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
+{
+ if (clp->cl_cb_ident)
+ idr_remove(&cb_ident_idr, clp->cl_cb_ident);
+}
+
#else
static void nfs4_shutdown_client(struct nfs_client *clp)
{
}
+
+void nfs_cleanup_cb_ident_idr(void)
+{
+}
+
+static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
+{
+}
#endif /* CONFIG_NFS_V4 */
/*
@@ -244,6 +294,7 @@
if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
list_del(&clp->cl_share_link);
+ nfs_cb_idr_remove_locked(clp);
spin_unlock(&nfs_client_lock);
BUG_ON(!list_empty(&clp->cl_superblocks));