linux-kernel - Re: [PATCH v3 3/3] init: add support for root devices specified by partition UUID

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Message-ID: <4C5A98A0.4030208@kernel.org>
Date:	Thu, 05 Aug 2010 12:55:28 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Will Drewry <wad@...omium.org>
CC:	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Jens Axboe <axboe@...nel.dk>, Karel Zak <kzak@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>, Jan Blunck <jblunck@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH v3 3/3] init: add support for root devices specified by
 partition UUID

Hello,

On 08/04/2010 08:22 PM, Will Drewry wrote:
> @@ -642,6 +642,7 @@ void __init printk_all_partitions(void)
>  		struct hd_struct *part;
>  		char name_buf[BDEVNAME_SIZE];
>  		char devt_buf[BDEVT_SIZE];
> +		u8 uuid[PARTITION_META_INFO_UUIDLTH * 2 + 1];
>  
>  		/*
>  		 * Don't show empty devices or things that have been
> @@ -660,10 +661,14 @@ void __init printk_all_partitions(void)
>  		while ((part = disk_part_iter_next(&piter))) {
>  			bool is_part0 = part == &disk->part0;
>  
> -			printk("%s%s %10llu %s", is_part0 ? "" : "  ",
> +			uuid[0] = 0;
> +			if (part->info)
> +				part_unpack_uuid(part->info->uuid, uuid);
> +
> +			printk("%s%s %10llu %s %s", is_part0 ? "" : "  ",
>  			       bdevt_str(part_devt(part), devt_buf),
>  			       (unsigned long long)part->nr_sects >> 1,
> -			       disk_name(disk, part->partno, name_buf));
> +			       disk_name(disk, part->partno, name_buf), uuid);

Hmmm... I'm a bit worried about this.  This might break userspace
tools.  I think it would be better to export it via sysfs.

Thanks.

-- 
tejun
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