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/init.c

@@ -3,19 +3,92 @@
  *
  * Copyright (C) 2007 Bahadir Balban
  */
-#include <kdata.h>
 #include <fs.h>
-#include <string.h>
+#include <vfs.h>
+#include <bdev.h>
+#include <task.h>
+#include <kdata.h>
 #include <stdio.h>
+#include <string.h>
 #include <l4/lib/list.h>
-#include <init.h>
-#include <blkdev/blkdev.h>
+#include <l4/api/errno.h>
+#include <memfs/memfs.h>
 
-void initialise(void)
+struct list_head fs_type_list;
+
+struct superblock *vfs_probe_filesystems(void *block)
 {
-	struct block_device *bdev;
+	struct file_system_type *fstype;
+	struct superblock *sb;
 
-	request_initdata(&initdata);
-	vfs_probe_fs(bdev);
+	list_for_each_entry(fstype, &fs_type_list, list) {
+		/* Does the superblock match for this fs type? */
+		if ((sb = fstype->ops.get_superblock(block))) {
+			/*
+			 * Add this to the list of superblocks this
+			 * fs already has.
+			 */
+			list_add(&sb->list, &fstype->sblist);
+			return sb;
+		}
+	}
+
+	return PTR_ERR(-ENODEV);
+}
+
+/*
+ * Registers each available filesystem so that these can be
+ * used when probing superblocks on block devices.
+ */
+void vfs_register_filesystems(void)
+{
+	/* Initialise fstype list */
+	INIT_LIST_HEAD(&fs_type_list);
+
+	/* Call per-fs registration functions */
+	memfs_register_fstype(&fs_type_list);
+}
+
+extern struct list_head vm_file_list;
+
+/*
+ * Filesystem initialisation.
+ */
+int initialise(void)
+{
+	void *rootdev_blocks;
+	struct superblock *root_sb;
+
+	/* Get standard init data from microkernel */
+	request_initdata(&initdata);
+
+	/* Register compiled-in filesystems with vfs core. */
+	vfs_register_filesystems();
+
+	/* Get a pointer to first block of root block device */
+	rootdev_blocks = vfs_rootdev_open();
+
+	/*
+	 * Since the *only* filesystem we have is a temporary memory
+	 * filesystem, we create it on the root device first.
+	 */
+	memfs_format_filesystem(rootdev_blocks);
+
+	INIT_LIST_HEAD(&vm_file_list);
+
+	/* Search for a filesystem on the root device */
+	BUG_ON(IS_ERR(root_sb = vfs_probe_filesystems(rootdev_blocks)));
+
+	/* Mount the filesystem on the root device */
+	vfs_mount_root(root_sb);
+
+	/* Learn about what tasks are running */
+	init_task_data();
+
+	/*
+	 * Initialisation is done. From here on, we can start
+	 * serving filesystem requests.
+	 */
+	return 0;
 }