Re: [PATCH v3 3/3] init: add support for root devices specified by partition UUID
From: Will Drewry
Date: Thu Aug 05 2010 - 15:19:24 EST
On Thu, Aug 5, 2010 at 9:29 AM, Tejun Heo <tj@xxxxxxxxxx> wrote:
> Hello,
>
> On 08/05/2010 04:26 PM, Will Drewry wrote:
>> On Thu, Aug 5, 2010 at 5:55 AM, Tejun Heo <tj@xxxxxxxxxx> wrote:
>>> 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.
>>
>> Cool - I'm happy to drop that part from the patch. I was more
>> following the spirit of the comment around making it easy for a user
>> to figure out what went wrong (e.g., wrong uuid) if they don't have a
>> root, but if there are tools parsing that output, I'd rather not break
>> them!
>
> Oh, forget about what I said. For some reason I thought the above
> code was for /proc/partitions. :-)
Cool - even better!
Thanks!
will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/