From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.senn@gmail.com (Will Senn) Date: Sun, 21 Feb 2016 09:21:30 -0600 Subject: [TUHS] Unix v6 File System information In-Reply-To: References: <20160221114412.62D8B18C0F6@mercury.lcs.mit.edu> Message-ID: <3EEAC13B-2B79-46F4-A45F-89EA56651E74@gmail.com> A technical description would be appreciated although the manpage looks like a good start as does Lions. I hadn't gotten to chapter 20 yet, should have known he would cover the topic. Sent from my iPhone > On Feb 21, 2016, at 7:34 AM, Dave Horsfall wrote: > >> On Sun, 21 Feb 2016, Noel Chiappa wrote: >> >> http://minnie.tuhs.org/cgi-bin/utree.pl?file=V6/usr/man/man5/fs.5 > > Yeah, but I was unsure whether the OP wanted a technical description, or > one in plain English :-) I'm still prepared to do the latter, once I can > find a spare hour. > > Somewhere, deep within Minnie's bowels, there might be a paper that I > wrote upon implementing a "bad block" system (specifically directed at the > RK-05, but generally applicable to any device); it involved the hitherto- > unused inode "0", to which were chained the bad blocks (added by hand). > > The trick was that normal FS utilities would ignore it... > > Someone at the time (Kevin Hill?) pointed out that inode "-1" could also > be used, but I wasn't prepared to go that far :-) > > -- > Dave Horsfall DTM (VK2KFU) "Those who don't understand security will suffer."