RE: reiser4 data journalling?

[<system_lists@nullzone.org>]

> -----Mensaje original-----
> De: Hans Reiser [mailto:reiser@namesys.com]
> Enviado el: viernes, 29 de agosto de 2003 23:43
> Para: Nikita Danilov
> CC: Oleg Drokin; Mike Fedyk; Tom Vier; Reiserfs List
> Asunto: Re: reiser4 data journalling?
> 
> Nikita Danilov wrote:
> 
> >Hans Reiser writes:
> > > Oleg Drokin wrote:
> > >
> > > >Hello!
> > > >
> > > >On Thu, Aug 28, 2003 at 06:23:22PM -0700, Mike Fedyk wrote:
> > > >
> > > >
> > > >
> > > >>So you can have one 5k memory area that spans two pages, and it will
> act on
> > > >>them atomically?  Or does that mean that the utils are already page
> aligned
> > > >>by other kernel mechanisims?  Or that they'll have to use the reiser
> API to
> > > >>do some of the above (other than the op grouping)?
> > > >>
> > > >>
> > > >
> > > >Data does not need to be page aligned for atomic operations.
> > > >
> > > >Bye,
> > > >    Oleg
> > > >
> > > >
> > > >
> > > >
> > > in reiser4
> >
> >Why?
> >
> >
> >
> Because atomicity in ext3 basically consists of guaranteeing that the
> filesystem is consistent, and due to the disk drive implementation 4k
> blocks are written atomically.  So, if you span more than one block, it is
> not guaranteed to be atomic.
> 
> Someone should correct me if I got it wrong, as ext3 is not my
> specialty....
> 

I think that is right.