Finished adding untested bare functionality vfs

Finished adding untested shm syscalls.
Finished adding untested l4 send/recv helpers

Everything compiles. Now going to fix lots of bugs ;-)

tasks/fs0/src/vfs.c

@@ -0,0 +1,36 @@
+/*
+ * High-level vfs implementation.
+ *
+ * Copyright (C) 2008 Bahadir Balban
+ */
+#include <fs.h>
+#include <vfs.h>
+
+struct vnode *vfs_lookup(struct superblock *sb, char *path)
+{
+	/* If it's just / we already got it. */
+	if (!strcmp(path, "/"))
+		return sb->root;
+
+	return sb->root->ops.lookup(sb->root, path);
+}
+
+/*
+ * /
+ * /boot
+ * /boot/images/mm0.axf
+ * /boot/images/fs0.axf
+ * /boot/images/test0.axf
+ * /file.txt
+ */
+struct vfs_mountpoint vfs_root;
+
+int vfs_mount_root(struct superblock *sb)
+{
+	/* Lookup the root vnode of this superblock */
+	vfs_root.pivot = vfs_lookup(sb, "/");
+	vfs_root.sb = sb;
+
+	return 0;
+}
+