On Sunday 09 December 2007 21:39:45 Carlos E. R. wrote:
> The Sunday 2007-12-09 at 19:03 +0100, Michael Skiba wrote:
> >>> ext3 as well
> >>
> >> Not really. all drivers/apps for Windows only support ext3 because the
> >> difference is mostly the journal. AFAIK, no driver/app supports the ext3
> >> journal, so in reality, they only support ext2.
> >
> > That's correct, however ext3 is backwards compatible, so you can read
> > write an ext3 partition(it feels like an ext2 one), however - if you
> > perform write tasks, then it will have to rebuild the journal on next
> > "real" use of ext3 (probably when you start Linux again).
>
> Not quite... ext3 can use some attrributes and features that ext2 doesn't
> understand. An ext3 filesystem making use of those can not be mounted as
> ext2.

"Ext3 shares all disk implementation with the ext2 filesystem, and adds
transactions capabilities to ext2.  Journaling is done by the Journaling Block
Device layer."

This is from /usr/src/linux/Documentation/filesystems/ext3.txt

I think it was a design criterion of ext3, that it should be fully usable on 
an ext2 only system

I believe they are departing from that in ext4, to be able to be usable at all 
on larger file systems

Anders

-- 
Madness takes its toll
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