On Fri, Oct 19, 2007 at 06:07:45AM +0930, David Newall wrote:
> >considerations of this whole scheme. Linux, like most Unix systems,
> >has never allowed hard links to directories for a number of reasons;
>
> The claim is wrong. UNIX systems have traditionally allowed the
> superuser to create hard links to directories. See link(2) for 2.10BSD
> <http://www.freebsd.org/cgi/man.cgi?query=link&sektion=2&manpath=2.10+BSD>.
> Having got that wrong throws doubt on the argument; perhaps a path can
> simultaneously be a file and a directory.
Learn to read. Linux has never allowed that. Most of the Unix systems
do not allow that. Original _did_ allow that, but at the cost of very
easily triggered fs corruption (and it didn't have things like rename(2) -
it _did_ have userland implementation, of course, in suid-root mv(1),
but that sucker had been extremely racy and could be easily used to
screw filesystem to hell and back; adding rename(2) to the set of primitives
combined with multiple links to directories leads to very nasty issues on
_any_ system).
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