Re: Some nilfs comments

[Chris Mason <chris.mason-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

On Wed, 2008-12-24 at 02:23 +0900, Ryusuke Konishi wrote:

> > > Thanks, I've also started to read btrfs.
> > > I'll see it during the Christmas holidays  ;)
> > 
> > Whats your first impression? Want to take over things/ideas? Isn't that a
> > quite different FS structurally since it doesn't have segments? (AFAIK!)
> 
> Yeah, btrfs has flexible and rich volume management layer, so very
> interesting.  The snapshot code and c-tree also look like fun.

The ctree (checksummed btree is really what it stands for) code itself
is pretty basic.  Aside from the checksumming, it is a simple btree with
generation numbers to find the nodes that have changed since a given
transaction.

In terms of interesting/new code that others might want look at, the
btrfs tree logging to do fsync efficiently (tree-log.c) and device
management (volumes.c) are probably the most interesting.

-chris