linux-kernel - Re: [PATCH v11] mmc : general purpose partition support.

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Message-ID: <4E8D4B5A.6040106@intel.com>
Date:	Thu, 06 Oct 2011 09:31:54 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Andrei Warkentin <awarkentin@...are.com>
CC:	Namjae Jeon <linkinjeon@...il.com>, linux-kernel@...r.kernel.org,
	linus walleij <linus.walleij@...aro.org>,
	james p freyensee <james_p_freyensee@...ux.intel.com>,
	sebras@...il.com, Ulf Hansson <Ulf.Hansson@...ricsson.com>,
	stefan xk nilsson <stefan.xk.nilsson@...ricsson.com>,
	per forlin <per.forlin@...ricsson.com>,
	johan rudholm <johan.rudholm@...ricsson.com>, cjb@...top.org,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH v11] mmc : general purpose partition support.

On 05/10/11 18:33, Andrei Warkentin wrote:
> Hi,
>
> ----- Original Message -----
>> From: "Namjae Jeon"<linkinjeon@...il.com>
>> To: cjb@...top.org, linux-mmc@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org, awarkentin@...are.com, "adrian hunter"<adrian.hunter@...el.com>, "linus walleij"
>> <linus.walleij@...aro.org>, "james p freyensee"<james_p_freyensee@...ux.intel.com>, sebras@...il.com, "Ulf Hansson"
>> <Ulf.Hansson@...ricsson.com>, "stefan xk nilsson"<stefan.xk.nilsson@...ricsson.com>, "per forlin"
>> <per.forlin@...ricsson.com>, "johan rudholm"<johan.rudholm@...ricsson.com>, "Namjae Jeon"<linkinjeon@...il.com>
>> Sent: Wednesday, October 5, 2011 10:45:45 AM
>> Subject: [PATCH v11] mmc : general purpose partition support.
>>
>> It allows gerneral purpose partitions in MMC Device.
>> And I try to simpliy make mmc_blk_alloc_parts using mmc_part
>> structure suggested by Andrei Warkentin.
>> After patching, we can see general purpose partitions like this.
>>> cat /proc/partitions
>>            179 0 847872 mmcblk0
>>            179 192 4096 mmcblk0gp3
>>            179 160 4096 mmcblk0gp2
>>            179 128 4096 mmcblk0gp1
>>            179 96  1052672 mmcblk0gp0
>>            179 64  1024 mmcblk0boot1
>>            179 32  1024 mmcblk0boot0
>>
>> Signed-off-by: Namjae Jeon<linkinjeon@...il.com>
>> ---
>>   drivers/mmc/card/block.c |   41 +++++++++++++++++++++++------------
>>   drivers/mmc/core/mmc.c   |   52
>>   ++++++++++++++++++++++++++++++++++++++++++---
>>   include/linux/mmc/card.h |   34 +++++++++++++++++++++++++++++-
>>   include/linux/mmc/mmc.h  |    5 +++-
>>   4 files changed, 112 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> +	for (idx = 0; idx<  card->nr_parts; idx++) {
>> +		if (mmc_is_boot_partition(&card->part[idx])&&
>> +			!mmc_boot_partition_access(card->host))
>> +			continue;
>> +		if (card->part[idx].size) {
>> +			ret = mmc_blk_alloc_part(card, md,
>> +				card->part[idx].part_cfg,
>> +				card->part[idx].size>>  9,
>> +				card->part[idx].force_ro,
>> +				card->part[idx].name);
>> +			if (ret)
>> +				return ret;
>> +		}
>>   	}
>
> Is there any reason for putting the mmc_boot_partition_access() logic here? If
> boot partitions are not allowed by host, then just don't add the mmc_parts to
> the parts array, no? Such minutae should belong in core mmc code, not block driver, IMHO.

I like data structures to model reality i.e. the partitions exist but are not 
accessible.  However I am not fussed - change it or not.

>
> A
>

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