linux-ext4 - Re: [E2FSPROGS, RFC] New mke2fs types parsing

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Message-ID: <20080320204950.GA7991@mit.edu>
Date:	Thu, 20 Mar 2008 16:49:50 -0400
From:	Theodore Tso <tytso@....EDU>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [E2FSPROGS, RFC] New mke2fs types parsing

On Thu, Mar 20, 2008 at 02:17:36PM -0500, Eric Sandeen wrote:
> Rather than *looking* for extN and size type in the magic first and
> second slots, what if we fill them in there internally, but they will be
> overridden by any other -T options specified.
> 
> Internally, first an extN type is picked up from mkfs.FOO first, or
> defaults fs type if not specified.  Seond, also internally, a size type
> is chosen next from the default size breakpoints.

Yes, this works, as long as we make sure every single filesystem and
size stanza in /etc/mke2fs.conf overrides each other completely.

Hmm.... Actually, as it's currently specified, it's not completely
true that a later parameter completely overrides a later one.  The one
it's not true for is the "features" profile knob, where each specific
filesystem called e2p_edit_features(), so that one particular features
knob is cumulative.

Given that I think my previous proposal of overriding -t is probably
the better one, and concuptally simpler to understand and document.

    	   	    			   	      - Ted
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