Date: Tue, 28 Nov 1995 05:30:08 +1100 From: Bruce Evans <bde@zeta.org.au> To: freebsd-hackers@freebsd.org, peter@haywire.dialix.com Subject: Re: How can I remove hard links between directories? Message-ID: <199511271830.FAA20667@godzilla.zeta.org.au>
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>Otherwise, we get bogons like netscape2 doing 'rename(".netscape/",
>".netscape.bak");' or something bogus like that, and the namei()
>lookup is or was converting ".netscape/" to mean ".netscape/." and was
Lookup now converts "foo/" to "foo" if foo is a directory and fails
otherwise.
>pulling "." out of the .netscape directory in root's home (assuming
>somebody was insane enough to run netscape as root.. :-)
>or some bogon inside "rdistd" running as root, renaming the "." files
>if you gave it a bogus distfile..
Renaming of "." and ".." has always been disallowed in FreeBSD. It
isn't possible to create a damaged tree using rename() (modulo bugs).
Renaming directories "by hand" using link() and unlink() is of course
dangerous.
>or things like inn's fastrm program that have to test if the euid ==
>0, and if so, it has to stat() every single file it's processing to
>make sure it's not about to unlink a directory and running much slower
>from the extra overhead.. (side note, always expire news as uid
>"news" for this very reason).
Why would it be much slower? unlink() is very slow if writes are
synchronous. Here repeated stats of the same file take 81 usec while
creat+close+unlink of the same file takes 5000 usec.
Bruce
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