rem: bootfs_unmount(fs_cookie _fs)
add: bootfs_unmount(fs_volume _fs)
context: bootfs_unmount(fs_cookie _fs){	struct bootfs *fs = _fs;	struct bootfs_vnode *v;	struct hash_iterator i;	TRACE(("bootfs_unmount: entry fs = %p\n", fs));	// delete all of the vnodes	hash_open(fs->vnode_list_hash, &i);	while((v = (struct bootfs_vnode *)hash_next(fs->vnode_list_hash, &i)) != NULL) {		bootfs_delete_vnode(fs, v, true);	}	hash_close(fs->vnode_list_hash, &i, false);	hash_uninit(fs->vnode_list_hash);	mutex_destroy(&fs->lock);	kfree(fs);	return 0;}