Date: Sat, 4 Apr 2026 00:37:52 -0700 From: Rick Macklem <rick.macklem@gmail.com> To: Konstantin Belousov <kib@freebsd.org> Cc: Warner Losh <imp@bsdimp.com>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: Getting boottime early in booting Message-ID: <CAM5tNy7kJ3NxA3Lt0Yj_e285mX5FoBUH8%2BCFDaLAiV%2B1bBywtg@mail.gmail.com> In-Reply-To: <adCB5JLDgnoYNrXI@kib.kiev.ua> References: <CAM5tNy4mPmG=OmQtiGrMQ8NnPZrN=dw_Xw1h9=s4iyOLiZCWng@mail.gmail.com> <CANCZdfrS6YbL2JCe=MgQL1==CL-x4hL=AEAvjJRdiK-8URARWg@mail.gmail.com> <adCB5JLDgnoYNrXI@kib.kiev.ua>
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On Fri, Apr 3, 2026 at 8:15 PM Konstantin Belousov <kib@freebsd.org> wrote: > > On Fri, Apr 03, 2026 at 07:13:02PM -0600, Warner Losh wrote: > > On Fri, Apr 3, 2026, 7:05 PM Rick Macklem <rick.macklem@gmail.com> wrote: > > > > > Hi, > > > > > > I'm fiddling with a NFSv4 diskless root fs setup and I've run > > > into a couple of challenges. > > > > > > 1 - I need a value that will be different each time the machine boots. > > > I would normally use getboottime(), but for the NFS root fs mount, > > > it just returns 0. > > > Any ideas w.r.t. something I can acquire early in booting that will > > > change each time the system is booted? > > > > > > > We don't have this today. And we can't have it without hardware assist... > > though you may be ok enough with a value from the rtc. > > > > There's work to pass the vale from the monotonicly increasing counter uefi > > provides. But not on all platforms. > > We already have mechanisms to ensure that early entropy is provided on > boot. Do you care if the value used is indeed boot time, or should it > only be unique per boot? > > With the entropy loading, I believe you would get what you need on any > machine with the persistent storage. Hmm, do you mean the stuff under /var/db/entropy? If so, that doesn't work for this case, since for an NFS root fs, /etc is usually a memory fs. (See https://docs-archive.freebsd.org/doc/8.4-RELEASE/usr/share/doc/freebsd/handbook/network-pxe-nfs.html) Without a unique per boot value, things work, it's just that it loops once more during the mount attempt, each time it is rebooted. (Without boring you with the details, each time a seq# gets incremented by 1 and it needs to loop until it gets to the next seq#. I can tweak the mount code so that it doesn't spew out printf()s when it loops.) Thanks, rick > > > > > Warner > > > > 2 - Does anyone know how to fix "could not determine audit condition" > > > which I get whenever I try and login when it is multiuser? > > > (I can run single user, but since I can't login once it's multiuser??) > > > > > > Thanks for any help with these, rick > > > > > > >home | help
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