Payal Rathod wrote:
On Wed, Jul 19, 2006 at 01:28:38PM -0700, Hans Reiser wrote:
V3 defaults to metadata only, V4 does data also because we can do it
without performance loss.
wwwwwwowwwww!!!
Don't get too excited -- the transactions probably aren't done yet.
Without those, no filesystem that claims to journal data is really any
better than a filesystem which only journals metadata. Even once they
are implemented (or even if they are already), applications have to
support them directly.
Regarding transactions in general, you should probably look for some
papers or tutorials for how they are implemented in databases. You
might also read the Reiser4 whitepaper for an idea of how they could be
implemented in a filesystem.
But no transactional system will work unless applications at least know
about it. This is why apps currently rely on features that are known to
be atomic in a filesystem. For instance, look at maildirs -- they are
effectively 100% data journaled on any filesystem that journals metadata
properly.
reiserfs does not use inodes at all. see our website for more.
Any particular page you are referring to? I didn't see a page for that
there.
Front page of Namesys.com has the Reiser4 whitepaper. It's a bit out of
date, as some features still listed for 4.0 have been pushed to 4.1 or
later, but I don't think the overall plan has changed.
