linux-kernel - Re: [PATCH v2] init: add root=PARTUUID=UUID,PARTNROFF=%d support

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Message-ID: <BANLkTinN_9q4u3UTfHAoL=rmAo+PKVf2jg@mail.gmail.com>
Date:	Sun, 26 Jun 2011 18:43:17 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Will Drewry <wad@...omium.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jens Axboe <jaxboe@...ionio.com>,
	Namhyung Kim <namhyung@...il.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: Re: [PATCH v2] init: add root=PARTUUID=UUID,PARTNROFF=%d support

On Fri, Jun 24, 2011 at 21:53, Will Drewry <wad@...omium.org> wrote:

> Upon further inspection, the code changes would not directly break any
> existing code, but PARTUUID=...,PARTNROFF= would not be usable via the
> other entrypoints to name_to_dev_t.  E.g., block2mtd or md because
> they take in comma-separated parameters prior to calling
> name_to_dev_t.  That seems like it'd be less than ideal.
>
> Kay,  Do you have a strong preference around the ,PARTNROFF= syntax?
> I'm not sure what the cleanest approach is, but I'm inclined to finish
> other patch cleanup (and documentation) and repost with '/' as the
> separator instead of ','.   At present ',' is reused across several
> places where devices are supplied by "name", but '/' is expected as
> part of the normal path semantic.  The other option would be to use
> ':' instead. ':' isn't usually overloaded as it is expected as part of
> a the device major:minor naming scheme, but slashes seem more sane
> even if weird:
>
>  PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF/PARTNROFF=1
>
> I'll repost along these lines unless someone indicates that this is
> too grotesque to consider.

Hmm, '/' might look a bit strange in the context of a path, which is
the common use case for root=.

We catch PARTUUID before parsing any of the other options, right? So
we can't really break anything.

Fstab and mount options in general all use ',' to separate keywords,
and I think we should do the same here. I think the ',' still looks
more natural than an artificial '/' to avoid possibly breaking
something we don't even call into. :)

Thanks,
Kay
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