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/include/file.h

@@ -0,0 +1,18 @@
+#ifndef __FS0_MM_H__
+#define __FS0_MM_H__
+
+/*
+ * Describes the in-memory representation of a file. This is used to track
+ * file content, i.e. file pages by mm0, this is a temporary mock up until
+ * fs0 and mm0 are wired together.
+ */
+struct vm_file {
+	unsigned long vnum;
+	unsigned long length;
+
+	/* This is the cache of physical pages that this file has in memory. */
+	struct list_head page_cache_list;
+	struct vm_pager *pager;
+};
+
+#endif /* __FS0_MM_H__ */