you can do this today with linux, just mount all your filesystems syncronously and you will have a system that you can shutdown at any time that it's not writing to your disk.
you will also have a system that you will find unusably slow, you don't realize how much you gain from not waiting for writes to hit disk before continuing.
Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds