Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3

Nikita Danilov
2006-06-11T16:35:45Z

Arjan van de Ven writes:
> On Fri, 2006-06-09 at 14:51 -0400, Jeff Garzik wrote:
> > PRECISELY. So you should stop modifying a filesystem whose design is
> > admittedly _not_ modern!
> >
> > ext3 is already essentially xiafs-on-life-support, when you consider
> > today's large storage systems and today's filesystem technology. Just
> > look at the ugly hacks needed to support expanding an ext3 filesystem
> > online.
>
>
> actually I think I disagree with you. One thing I've noticed over the
> years is that ext2 layout has one thing going for it: it is simple and
> robust. Maybe "ext2 layout" is the wrong word, "block bitmap and
> direct/indirect block based" may be better. It seems that once you go
> into tree space (and I would call htree a borderline thing there) you
> get both really complex code and fragile behavior all over (mostly in
> terms of "when something goes wrong")

Huh? Direct/indirect/double-indirect/... _is_ a tree, albeit not
balanced one. What makes s5fs/ffs/ufs/ext* so exceptionally robust is
fixed position of inode tables, which provides a guaranteed starting
point for fsck under almost any circumstances.

Nikita.