On Tue, May 29, 2012 at 08:40:10AM +0800, Li Zefan wrote: > > Is there any way to mark existing snapshots as read-only? Making new > > ones read-only is easy enough, but what about existing ones? > > We have code in the kernel side, so what we need to do is to update btrfs-progs, > which is trivial. Well, I don't like that it's even possible to turn a RO snapshot to a RW one. What was the rationale behind this back then? Besides, I think that it could break assumptions in the backref code. If it's only a one-way operation from a regular subvol -> RO subvol, this sounds reasonable to me. If the opposite direction is allowed, then I'd not call it 'read-only' but "unwritable on-request". david -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
