IMFS: Add and use node control

Add and use structure IMFS_node_control with support functions.  This
helps to make high level functions independent of the node type and
reduces the number of branches in the code.

1 files changed, 65 insertions, 4 deletions

diff --git a/cpukit/libfs/src/imfs/imfs_handlers_link.c b/cpukit/libfs/src/imfs/imfs_handlers_link.c
index fd68f77eef..08dddb701d 100644
--- a/cpukit/libfs/src/imfs/imfs_handlers_link.c
+++ b/cpukit/libfs/src/imfs/imfs_handlers_link.c
@@ -17,11 +17,9 @@
 
 #include "imfs.h"
 
-/*
- *  Handler table for IMFS device nodes
- */
+#include <stdlib.h>
 
-const rtems_filesystem_file_handlers_r IMFS_link_handlers = {
+static const rtems_filesystem_file_handlers_r IMFS_link_handlers = {
   rtems_filesystem_default_open,
   rtems_filesystem_default_close,
   rtems_filesystem_default_read,
@@ -34,3 +32,66 @@ const rtems_filesystem_file_handlers_r IMFS_link_handlers = {
   rtems_filesystem_default_fsync_or_fdatasync,
   rtems_filesystem_default_fcntl
 };
+
+static IMFS_jnode_t *IMFS_node_initialize_hard_link(
+  IMFS_jnode_t *node,
+  const IMFS_types_union *info
+)
+{
+  node->info.hard_link.link_node = info->hard_link.link_node;
+
+  return node;
+}
+
+static IMFS_jnode_t *IMFS_node_remove_hard_link(
+  IMFS_jnode_t *node,
+  const IMFS_jnode_t *root_node
+)
+{
+  IMFS_jnode_t *target = node->info.hard_link.link_node;
+
+  if ( target->st_nlink == 1) {
+    target = (*target->control->node_remove)( target, root_node );
+    if ( target == NULL ) {
+      node = NULL;
+    }
+  } else {
+    --target->st_nlink;
+    IMFS_update_ctime( target );
+  }
+
+  return node;
+}
+
+const IMFS_node_control IMFS_node_control_hard_link = {
+  .imfs_type = IMFS_HARD_LINK,
+  .handlers = &IMFS_link_handlers,
+  .node_initialize = IMFS_node_initialize_hard_link,
+  .node_remove = IMFS_node_remove_hard_link,
+  .node_destroy = IMFS_node_destroy_default
+};
+
+static IMFS_jnode_t *IMFS_node_initialize_sym_link(
+  IMFS_jnode_t *node,
+  const IMFS_types_union *info
+)
+{
+  node->info.sym_link.name = info->sym_link.name;
+
+  return node;
+}
+
+static IMFS_jnode_t *IMFS_node_destroy_sym_link( IMFS_jnode_t *node )
+{
+  free( node->info.sym_link.name );
+
+  return node;
+}
+
+const IMFS_node_control IMFS_node_control_sym_link = {
+  .imfs_type = IMFS_SYM_LINK,
+  .handlers = &IMFS_link_handlers,
+  .node_initialize = IMFS_node_initialize_sym_link,
+  .node_remove = IMFS_node_remove_default,
+  .node_destroy = IMFS_node_destroy_sym_link
+};