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Re: Raw EXT3 block format

On Wed, Apr 03, 2002 at 05:16:22PM +0200, Pieter De Wit wrote:
> Hello Guys,
> I am looking to extend/create a file system that span networks/device of any
> kind, shape and manner :) Check out http://www.insync.za.net/openufs/ (also
> on http://openufs.sourceforge.net - but Iam not here to adv. the site !)
> I would like to know, where can I find what EXT3 will write to the disk, how
> it works etc.
> Surely EXT3 will write something like this :
> Block 0 - (1024 bytes) {DATA}
> Block 1 - (1024 bytes) {FAT type block}
> Hope this makes sense.....
> Cheers,
> Pieter De Wit

You can find the ext2 format detailed on

The current ext3 code, the one included in the 2.5.x kernels, is
basically ext2 + journaling, so the format on disk is pretty much

I had a peek in Mr. Tytso's ext3 notes and there was something about an
"inode V2" format, but other than that, I haven't seen any trace that
things would be done differently than in Ext2.

Hope this helps,
EKS - Dave Poirier

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