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The Sunday 2007-12-09 at 22:26 +0100, Anders Johansson wrote:
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
Not quite. Any ext2 is mountable as ext3, and normally the contrary is
also true. However, ext3 can add extra fields that are incompatible with
ext2, so that a partition using those new features is no longer mountable
by a system only capable of ext2.
This is true; however, I don't remember a document I can point you to.
- --
Cheers,
Carlos E. R.
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