linux-kernel - Re: [PATCH] msdos: add support for large disks

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Message-ID: <87pr3fd68r.fsf@devron.myhome.or.jp>
Date:	Mon, 08 Mar 2010 09:09:08 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Taylor <Daniel.Taylor@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] msdos: add support for large disks

"H. Peter Anvin" <hpa@...or.com> writes:

> On 03/07/2010 02:59 AM, OGAWA Hirofumi wrote:
>> This part is broken. If "size" is smaller than minimum blocksize (note,
>> "size" is number of 512b, not number of blocksize), we can't read any
>> block after all (it is handled as outside of i_size by bdev).
>>
>> Peter (or someone) know what do we want to in here? This is on extended
>  > partition itself (e.g. if sda1 sda2<sda5 sda6>, it's the size of sda2)
>
> We should presumably set it to one logical sector, regardless of size. 
> Either that, or the offset of the lowest contained partition.

It means,

	min(size, max(logical_sector_size / 512, 2));

or like this? ("size" is "nr_sects(part) * (logical_sector_size/512)")

This should keep old logic, i.e. if partition is bigger than 1kb, it
uses 1kb for (probably) LILO mentioned by comment.

>> [BTW, it seems subtypes stuff is not thinking about sector size>  512b...]
>
> Much else isn't, either.  With the exception of some MO disks, it was 
> nearly unheard of for 20 years.

Yes. So, well, if someone know the spec of those subtypes, let us know.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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