Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!att!cbnewsi!npl
From: npl@cbnewsi.ATT.COM (nickolas.landsberg)
Newsgroups: comp.unix.wizards
Subject: Re: rename strangeness, a possible bug
Summary: Changing parents
Message-ID: <647@cbnewsi.ATT.COM>
Date: 25 Aug 89 18:44:19 GMT
References: <24612@santra.UUCP> <8352@boring.cwi.nl>
Organization: AT&T Bell Laboratories
Lines: 18

In article <24612@santra.UUCP> jkp@cs.HUT.FI (Jyrki Kuoppala) writes:
 > jkp@joker.hut.fi 'src' 451: ls -lagF
 > total 4
 > drwxrwxr-x  4 root     staff         512 Aug 25 01:04 ./
 > drwxr-xr-x  6 nobody   wheel         512 Aug 23 23:33 ../
 > drwxr-xr-x  2 haa      staff         512 Aug 24 16:32 OS-hd-fix/
 > drwxrwxr-x  4 jkp      staff         512 Aug 25 01:04 local/
 > jkp@joker.hut.fi 'src' 452: mv OS-hd-fix local
 > mv: OS-hd-fix: rename: Permission denied

"mv" only allows the rename of a directory "only if the the two
directories have the same parent."  In this case, the attempted move
was to a different directory.  Details of why whis is have slipped
from memory but probably have somthing to do with the necessity of
changing the inode number for ".." in the original directory in addition
to changing link counts in the original parent and the new parent.

Nick Landsberg