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

[Tejun Heo <tj@kernel.org>]

Hello,

On 08/05/2010 04:26 PM, Will Drewry wrote:
> On Thu, Aug 5, 2010 at 5:55 AM, Tejun Heo <tj@kernel.org> 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.  :-)

Thanks.

-- 
tejun