(define filesystem (new-filesystem
                    (+ perm/irusr perm/ixusr perm/irgrp perm/ixgrp perm/iroth perm/ixoth)
                    "root"
                    "root"
                    0
                    0))

(insert-file! filesystem
              qtfile
              "hello"
              (+ perm/irusr perm/ixusr perm/irgrp perm/ixgrp perm/iroth perm/ixoth)
              "root"
              "root"
              "root"
              #f
              0
              0
              (lambda (file) "Hello, world!")
              0)

...

[alaric@ahu ~]$ sudo mount -t 9p 127.0.0.1 /mnt/tmp2 -o port=1564
Password: 
[alaric@ahu ~]$ cat /mnt/tmp2/hello
Hello, world![alaric@ahu ~]$