[Ocfs2-devel] [RFC] The reflink(2) system call v4.

[Jörn Engel]

On Mon, 11 May 2009 13:40:11 -0700, Joel Becker wrote:
>
> 	Here's v4 of reflink().  If you have the privileges, you get the
> full snapshot.  If you don't, you must have read access, and then you
> get the entire snapshot (data and extended attributes) except that the
> security context is reinitialized.  That's it.  It fits with most of the
> other ops, and it's a clean degradation.

Let me see if I understand this correctly.  File "/tmp/foo" belongs to
Joel, file "/tmp/bar" belongs to Joern.  Everyone has read access to
those files.  Now if you reflink them to your home directory, both files
belong to you.  If I reflink them to my home directory, both files
belong to me.  And if root reflinks them to /root, one file belongs to
Joel, the other to Joern.  Is that correct?

Because if it is, I would call that behaviour rather confusing.  A
system call that behaves differently depending on who calls it - or
on whether the binary is installed suid root - is something I would like
to avoid.

Jörn

-- 
A surrounded army must be given a way out.
-- Sun Tzu