linux-kernel - Re: [PATCH v2] mmc : general purpose partition support.

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Message-ID: <CACRpkdaCVj1J10BeCbOgwvRAqfN=gmV-1_FYmd9W1cwFqWMiag@mail.gmail.com>
Date:	Thu, 29 Sep 2011 08:47:06 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	NamJae Jeon <linkinjeon@...il.com>
Cc:	cjb@...top.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, awarkentin@...are.com,
	adrian.hunter@...el.com, james_p_freyensee@...ux.intel.com,
	sebras@...il.com, Ulf Hansson <Ulf.Hansson@...ricsson.com>,
	Stefan Nilsson XK <stefan.xk.nilsson@...ricsson.com>,
	Per Forlin <per.forlin@...ricsson.com>,
	johan.rudholm@...ricsson.com
Subject: Re: [PATCH v2] mmc : general purpose partition support.

On Wed, Sep 28, 2011 at 3:50 PM, NamJae Jeon <linkinjeon@...il.com> wrote:
> 2011/9/28 Linus Walleij <linus.walleij@...aro.org>:
>> On Sat, Sep 24, 2011 at 7:07 AM, Namjae Jeon <linkinjeon@...il.com> wrote:
>>>
>>>          179 64  1024 mmcblk0boot1
>>>          179 32  1024 mmcblk0boot0
>>
>> Does this mean that each GP-partition can contain an MBR and thus several
>> subpartitions so we get things like:
>>
>> mmcblk0gp1p1, mmcblk0gp1p2...
>>
> Yes, We can divide dos partitions(included MBR) using fdisk like your
> words(mmcblk0gp1p1, mmcblk0gp1p2...)

OK that seems logical.

If this goes in, make a mental note to patch udev default rules
too, because currently they look like this:

rules.d/60-persistent-storage.rules:KERNEL=="mmcblk[0-9]",
SUBSYSTEMS=="mmc", ATTRS{name}=="?*", ATTRS{serial}=="?*",
ENV{ID_NAME}="$attr{name}", ENV{ID_SERIAL}="$attr{serial}",
SYMLINK+="disk/by-id/mmc-$env{ID_NAME}_$env{ID_SERIAL}"
rules.d/60-persistent-storage.rules:KERNEL=="mmcblk[0-9]p[0-9]",
ENV{ID_NAME}=="?*", ENV{ID_SERIAL}=="?*",
SYMLINK+="disk/by-id/mmc-$env{ID_NAME}_$env{ID_SERIAL}-part%n"

(I guess Android also has this kind of rule baked into its "big init"
process that handles also what udev normally takes care of.)

Anyway:
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij
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