linux-kernel - Re: Version number policy!

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Message-ID: <20130409003720.GA5145@thunk.org>
Date:	Mon, 8 Apr 2013 20:37:20 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Adrian Chadd <adrian@...ebsd.org>
Cc:	Christian Lamparter <chunkeey@...glemail.com>,
	Eugene Krasnikov <k.eugene.e@...il.com>,
	Kalle Valo <kvalo@...rom.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	linux-bluetooth <linux-bluetooth@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	ath9k_htc_fw <ath9k_htc_fw@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Version number policy!

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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