Re: File copy system call proposal

From: Pavel Machek (
Date: Mon Dec 10 2001 - 07:13:53 EST


> >> I would like to propose implementing a file copy system call.
> >> I expect the initial reaction to such a proposal would be "feature
> >> bloat" but I believe some substantial benefits can be seen possibly
> >> making it worthwhile, primarily the following:
> >>
> >> Copy on write:
> >
> > You want cowlink() syscall, not copy() syscall. If they are on different
> > partitions, let userspace do the job.
> That looks like a knee-jerk reaction to stuff going in the kernel.
> I want maximum survival of non-UNIX metadata and maximum performance
> for this common operation. Let's say you are telecommuting, and...

It would be very ugly if cp -a started behaving differently after you
upgrade it to use copyfile(). Better preserve only metadata you

Casualities in World Trade Center: 6453 dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.
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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:17 EST