On Tue, Feb 16, 2016 at 01:22:13PM -0500, Rich Freeman wrote: > On Tue, Feb 16, 2016 at 1:05 PM, William Hubbs <willi...@gentoo.org> wrote: > > > > The reason it exists is very vague to me; I think it has something to do > > with claims of data loss in the past. > > > > Is there some other event that will cause all filesystems to be > remounted read-only or unmounted before shutdown?
When localmount/netmount stop they try to unmount file systems they know about, but they do not try to remount anything. > You definitely will want to either unmount or remount readonly all > filesystems prior to rebooting. I don't think the kernel guarantees > that this will happen (I'd have to look at it). Just doing a sync > before poweroff doesn't seem ideal - if nothing else it will leave > filesystems marked as dirty and likely force fscks on the next boot > (or at least it should - if it doesn't that is another opportunity for > data loss). > > There are different ways of accomplishing this of course, but you > really want to have everything read-only in the end. unmounting is easy enough; we already do that. What I'm trying to figure out is, what to do about re-mounting file systems read-only. How does systemd do this? I didn't find an equivalent of the mount-ro service there. William
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