Add mount sources for a MountNode (inode)

native_client_sdk/src/libraries/nacl_mounts/mount_node_dir.cc

Index: native_client_sdk/src/libraries/nacl_mounts/mount_node_dir.cc
===================================================================
--- native_client_sdk/src/libraries/nacl_mounts/mount_node_dir.cc	(revision 134714)
+++ native_client_sdk/src/libraries/nacl_mounts/mount_node_dir.cc	(working copy)
@@ -3,15 +3,17 @@
  * found in the LICENSE file.
  */
 
+#include <dirent.h>
 #include <errno.h>
 #include <sys/stat.h>
 
+#include "macros.h"
 #include "auto_lock.h"
 #include "mount_node_dir.h"
 
-MountNodeDir::MountNodeDir(Mount* mount, int ino, int dev) :
-    MountNode(mount, ino, dev),
-    cache_(NULL) {
+MountNodeDir::MountNodeDir(Mount* mount, int ino, int dev)
+    : MountNode(mount, ino, dev),
+      cache_(NULL) {
 }
 
 MountNodeDir::~MountNodeDir() {
@@ -73,7 +75,6 @@
     errno = ENOENT;
     return -1;
   }
-
   if (name.length() >= MEMBER_SIZE(struct dirent, d_name)) {
     errno = ENAMETOOLONG;
     return -1;
@@ -114,6 +115,11 @@
   return NULL;
 }
 
+int MountNodeDir::ChildCount() {
+  AutoLock lock(&lock_);
+  return map_.size();
+}
+
 void MountNodeDir::ClearCache() {
   free(cache_);
   cache_ = NULL;