linux-kernel - RE: [PATCH 2/2] fs/partition/msdos: Fix unusable extended partition for

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Date:	Wed, 10 Mar 2010 15:16:59 -0800
From:	"Daniel Taylor" <Daniel.Taylor@....com>
To:	"OGAWA Hirofumi" <hirofumi@...l.parknet.co.jp>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] fs/partition/msdos: Fix unusable extended partition for > 512B sector

In the near future, WD will be releasing products that need this patch.

Wouldn't it be a better Linux user experience to never have the problem,
rather than wait for a bug-fix cycle on the kernel?

OTOH, it would be reasonable to wait until someone else had a chance to
test the change.  We are awaiting NDAs from RedHat, Canonical, and
Novell/SUSE to send them the affected products for library/application
development.

Regards,

Dan 

> -----Original Message-----
> From: OGAWA Hirofumi [mailto:hirofumi@...l.parknet.co.jp] 
> Sent: Wednesday, March 10, 2010 7:52 AM
> To: Andrew Morton
> Cc: H. Peter Anvin; Daniel Taylor; linux-kernel@...r.kernel.org
> Subject: [PATCH 2/2] fs/partition/msdos: Fix unusable 
> extended partition for > 512B sector
> 
> We can drop this patch, if we want to delay until someone notice this
> and have some real requests to this.
> 
> 
> 
> 
> Smaller size than a minimum blocksize can't be used, after all it's
> handled like 0 size.
> 
> For extended partition itself, this makes sure to use bigger size than
> one logical sector size at least.
> 
> Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
> ---
> 
>  fs/partitions/msdos.c |   13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff -puN fs/partitions/msdos.c~part-support-4k-block-fix 
> fs/partitions/msdos.c
> --- linux-2.6/fs/partitions/msdos.c~part-support-4k-block-fix	
> 2010-03-08 20:11:39.000000000 +0900
> +++ linux-2.6-hirofumi/fs/partitions/msdos.c	2010-03-08 
> 20:32:19.000000000 +0900
> @@ -492,9 +492,16 @@ int msdos_partition(struct parsed_partit
>  		if (!size)
>  			continue;
>  		if (is_extended_partition(p)) {
> -			/* prevent someone doing mkfs or mkswap on an
> -			   extended partition, but leave room 
> for LILO */
> -			put_partition(state, slot, start, size 
> == 1 ? 1 : 2);
> +			/*
> +			 * prevent someone doing mkfs or mkswap on an
> +			 * extended partition, but leave room for LILO
> +			 * FIXME: this uses one logical sector 
> for > 512b
> +			 * sector, although it may not be enough/proper.
> +			 */
> +			sector_t n = 2;
> +			n = min(size, max(sector_size, n));
> +			put_partition(state, slot, start, n);
> +
>  			printk(" <");
>  			parse_extended(state, bdev, start, size);
>  			printk(" >");
> _
> 
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
> 
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