12 May
2017
12 May
'17
4:21 p.m.
On Fri, May 12, 2017 at 9:52 AM, Chet Ramey <chet.ramey(a)case.edu> wrote:
On 5/12/17 10:30 AM, Larry McVoy wrote:
There's also Margo's paper on LFS, which added logging to UFS, though
by the time it was over it wasn't recognizable.
https://www.usenix.org/publications/library/proceedings/sd93/seltzer.pdf
The Journaled updates, though, is that someone added an intent log to
UFS + SoftUpdates. This was used to replay the last few operations
when doing fsck coming back up after a crash. There's also something
called gjournal, which adds a different type of journaling to UFS, but
the less said about that train-wreck the better.
Warner
On Fri, May 12, 2017 at 02:56:59PM +0100, Tim
Bradshaw wrote:
You could look at the soft updates paper from 1999 for Kirk's perspective.
https://www.usenix.org/legacy/event/usenix99/full_papers/mckusick/mckusick.…
There was a paper about journaled soft updates, too:
https://www.mckusick.com/softdep/suj.pdf When I found out about this I thought seriously
of shorting Sun's
stock (if I knew how to do that). I would have made money. As it was
we stuck with logged UFS which, by 2007 or so was seriously bulletproof.
Wait, someone added logging to UFS? Is there a writeup of that anywhere?