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

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Date:	Tue, 18 Mar 2008 00:16:53 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Theodore Tso <tytso@....EDU>
CC:	linux-ext4@...r.kernel.org
Subject: Re: [E2FSPROGS, RFC] New mke2fs types parsing

Theodore Tso wrote:

> The question then is what to do when the user specifies something
> non-sensical, where they put the filesystem type last.  

Well, I'd say do what they asked, treat the [filesystem type] stanza
just like any other, and anything in it which may override previous
stanzas, does.

> One approach
> would be to use a two-pass algorithm, where you first scan the list
> for any filesystem type or size types, and if so, you suppress
> prefixing the list with the fs_type and size_type.  I think that's
> what you are suggesting.

Not exactly...

> Then there was my approach, which was admittedly partially influenced
> by what was quicker and easier to code, which only checked the
> expected position.

Well, I think that what I'm suggesting (but it's late, and I'm tired, so
it's hard for me to tell for sure... ;) is that there is no special
anything.  You simply take the specified -T arguments in order, and use
that as the search/override order for any setting found in the stanzas
specified.  This would probably be simplest to code, actually, as well
as simplest to document, and even most powerful/flexible for the user.

But, I suppose I can live with

     -T [fs_type,][size_type,]user_type[,additional_type...]

which is reasonably clear, though... we just need to document that there
are 7 special stanza names in 2 categories, which the code will put
there *for* you if you don't put it them the right place, yourself.
It's just, IMHO, a more complicated and restricted specification for the
option.

-Eric
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