RE: FS copy model
From: Peter Vogel <pvogel_at_arsin.com>
Date: 2001-01-03 09:38:39 CET
My personal opinion is that *copying* implies no need
Again, personal opinion, but based on 12 years
-- Peter A. Vogel Manager, Configuration Management Arsin Corporation 4800 Great America Parkway Suite 425, Santa Clara, CA 95054 > -----Original Message----- > From: Greg Stein [mailto:email@example.com] > Sent: Tuesday, January 02, 2001 8:47 PM > To: firstname.lastname@example.org > Subject: FS copy model > > > Okay... this isn't related to the network layer. Honest! > > :-) > > > Let's say that I have the following items of interest in the FS: > > PATH ID > / 1.37 > /A 50.7 > /A/foo 73.4 > /B 61.8 > > Now I make a copy of /A/foo to /B/foo. The IDs are now: > > / 1.38 > /A 50.7 > /A/foo 73.4 > /B 61.9 > /B/foo 73.4 > > And one more copy to /B/bar: > > / 1.39 > /A 50.7 > /A/foo 73.4 > /B 61.10 > /B/foo 73.4 > /B/bar 73.4 > > In each copy, you'll note that only the directory's ID > changes because I'm > not actually making any change to 73.4. We see /B change and > the resulting > bubble-up to /. > > > Question: should /B/foo and /B/bar know that they came from > /A/foo? To put > it another way, when somebody pulls up a change log for /B/foo: > > 1) they will see the changes from 73.1 thru 73.4 > 2) will they *also* see that /B/foo was copied from /A/foo? > > In the above handling of node IDs and copying, the answer is > "No, they have > no way of knowing whether /B/foo was copied from /A/foo or > from /B/bar. The > user *might* have a way to see that they are related, but only the > inspection of parent directory changes will show the actual > ordering of > copies. Even then, the comment for the revision may not > specify what was > copied from where." > > Another alternative is to spin a new revision of 73.4 and insert some > property / comment / marker saying that it was copied from > /A/foo. The final > ID table would look like: > > / 1.39 > /A 50.7 > /A/foo 73.4 > /B 61.10 > /B/foo 22.214.171.124 > /B/bar 126.96.36.199 > > > Which approach are we using today? (has it been considered?) > Is that the > preferred approach? > > I think another way to phrase the question is: > > Do we record a copy from one location to another in the FS? > If so, then > how is it recorded? Is there a machine-readable marker? (the checkin > comment is not machine-readable) > > Cheers, > -g > > -- > Greg Stein, http://www.lyra.org/ >Received on Sat Oct 21 14:36:19 2006
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