Prepared struct node for stacks of shadow nodes

So far dynamic translator stacks were created in the following
fashion: nsmux created a shadow node on which the whole
dynamic translator stack was built. This commit starts the
transition to a different strategy: the new approach consists
in setting *each* dynamic translator on its personal shadow
node. To achieve such functionality the set of fiels of struct
node was modified and the bits of code that manipulated these
fields were stripped out. The code is not functional now. The
coming commits will bring it back to life.

1 files changed, 13 insertions, 49 deletions

diff --git a/node.c b/node.c
index f98966a45..7df0afc17 100644
--- a/node.c
+++ b/node.c
@@ -94,9 +94,10 @@ error_t node_create (lnode_t * lnode, node_t ** node)
       node_new->nn->flags = 0;
       node_new->nn->ncache_next = node_new->nn->ncache_prev = NULL;
 
-      /*initialize the list of translators */
-      node_new->nn->trans = NULL;
-      node_new->nn->ntrans = node_new->nn->translen = 0;
+      /*initialize the data fields dealing with positioning this node
+	in the dynamic translator stack */
+      node_new->nn->trans_cntl = MACH_PORT_NULL;
+      node_new->nn->below = NULL;
 
       /*store the result of creation in the second parameter */
       *node = node_new;
@@ -148,9 +149,10 @@ error_t node_create_proxy (lnode_t * lnode, node_t ** node)
       node_new->nn->flags = 0;
       node_new->nn->ncache_next = node_new->nn->ncache_prev = NULL;
 
-      /*initialize the list of translators */
-      node_new->nn->trans = NULL;
-      node_new->nn->ntrans = node_new->nn->translen = 0;
+      /*initialize the data fields dealing with positioning this node
+	in the dynamic translator stack */
+      node_new->nn->trans_cntl = MACH_PORT_NULL;
+      node_new->nn->below = NULL;
 
       /*store the result of creation in the second parameter */
       *node = node_new;
@@ -172,12 +174,8 @@ void node_destroy (node_t * np)
   if (np->nn->port != MACH_PORT_NULL)
     PORT_DEALLOC (np->nn->port);
 
-  /*If there are translators to kill */
-  if (np->nn->lnode->dir && np->nn->trans)
-    {
-      /*kill all translators on the underlying nodes */
-      node_kill_translators (np);
-    }
+  /*TODO: If this node is a shadow node, kill the translator sitting
+    on this node. */
 
   /*Lock the lnode corresponding to the current node */
   mutex_lock (&np->nn->lnode->lock);
@@ -665,6 +663,7 @@ error_t node_set_translators (struct protid * diruser, node_t * np,
 			      size_t ntrans, int flags, char * filename,
 			      mach_port_t * port)
 {
+#if 0
   error_t err;
   mach_port_t p;
 
@@ -760,11 +759,6 @@ error_t node_set_translators (struct protid * diruser, node_t * np,
 	if(!np->nn->port)
 	  return ENOENT;
 
-	np->nn->port_notrans = file_name_lookup_under
-	  (diruser->po->np->nn->port, filename, flags | O_NOTRANS, 0);
-	if(!np->nn->port)
-	  return ENOENT;
-
 	/*duplicate the supplied user */
 	err = iohelp_dup_iouser (&user, diruser->user);
 	if (err)
@@ -897,40 +891,10 @@ error_t node_set_translators (struct protid * diruser, node_t * np,
   /*Return the port */
   *port = p;
 
+#endif
+
   /*Everything is OK here */
   return 0;
 }				/*node_set_translators */
 
 /*---------------------------------------------------------------------------*/
-/*Kills all translators on the nodes belonging to the given directory*/
-void node_kill_translators (node_t * node)
-{
-  /*If the node has no translators */
-  if (node->nn->trans == NULL)
-    /*nothing to do */
-    return;
-
-  error_t err = 0;
-
-  /*The current element in the port list */
-  port_el_t *p_el;
-
-  /*While the list of control ports is not empty */
-  for (p_el = node->nn->cntl_ports; p_el; p_el = node->nn->cntl_ports)
-    {
-      /*kill the current translator */
-      err = fsys_goaway (p_el->p, 0);
-
-      /*If the translator says it is busy, force it to go away */
-      if (err == EBUSY)
-	err = fsys_goaway (p_el->p, FSYS_GOAWAY_FORCE);
-
-      /*move the beginning of the list of control ports forward */
-      node->nn->cntl_ports = p_el->next;
-
-      /*destroy the current cell in the list of ports */
-      free (p_el);
-    }
-}				/*node_kill_translators */
-
-/*---------------------------------------------------------------------------*/