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Date: Mon, 8 Apr 2013 20:37:20 -0400
From: "Theodore Ts'o" <tytso@mit.edu>
To: Adrian Chadd <adrian@freebsd.org>
Cc: Christian Lamparter <chunkeey@googlemail.com>,
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Subject: Re: Version number policy!
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On Mon, Apr 08, 2013 at 04:12:07PM -0700, Adrian Chadd wrote:
> I'm a FreeBSD user. I know what it's like to have an alternate, out of
> linux implementation of ext2/3 that doesn't implement all of the
> features.
> 
> I also know what kinds of crap happens when you try mounting a more
> recent extX filesystem on an earlier kernel. Ie, it doesn't
> necessarily end well. :-)

There shouldn't be any crap; just a an error message indicating that
"the file system has features which this implementation doesn't
understand".  At least, if the implementation was competently
coded.... (ext2/3/4 has feature bitmasks that make it very clear what
features are required so that an implementation can mount the file
system read/write or read/only).

							- Ted
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