[U-Boot] [PATCH] ubifs: Allow ubifsmount volume reference by number

[Joe Hershberger]

Hi Vikram,

On Mon, Nov 5, 2012 at 11:36 AM, Vikram Narayanan <vikram186 at gmail.com> wrote:
> Hi Joe,
>
>
> On 11/5/2012 10:19 PM, Joe Hershberger wrote:
>>
>> Hi Vikram,
>>
>> On Mon, Nov 5, 2012 at 10:43 AM, Vikram Narayanan<vikram186 at gmail.com>
>> wrote:
>>>
>>>
>>> On 11/2/2012 8:24 AM, Joe Hershberger wrote:
>>>>
>>>>
>>>> UBI can mount volumes by name or number  The current code forces you
>>>> to name the volume by prepending every name with "ubi:".
>>>>
>>>>   From fs/ubifs/super.c
>>>>    * There are several ways to specify UBI volumes when mounting UBIFS:
>>>>    * o ubiX_Y    - UBI device number X, volume Y;
>>>>    * o ubiY      - UBI device number 0, volume Y;
>>>>    * o ubiX:NAME - mount UBI device X, volume with name NAME;
>>>>    * o ubi:NAME  - mount UBI device 0, volume with name NAME.
>>>>
>>>> Now any name passed in any of the above forms are allowed.
>>>
>>>
>>>
>>> What exactly are we gaining from this naming compared to the default?
>>> In what way the old naming affects the end user?
>>
>>
>> The reason I needed this change is so that I could specify the volume
>> by number in a script instead of being forced to know the name.  In
>> Linux you can use the volume number using the format above (it's the
>> same code).
>
>
> If that is the case, then the one can create the partition using the below
> command,
>
>> ubi createvol <vol name>
>
> <vol name> can be any of the 4 methods listed above.

I believe that is incorrect.  <vol name> is literally the name that
can be used in the form "ubiX:<vol name>".  It doesn't make sense to
use the above forms when creating the volume.  The ubi index is
already set by calling ubi part <mtd partition>.  The volume index is
simply the next volume in that ubi.

> and the prefix "ubi:" will be appended in the environment which is expected
> by kernel for mounting. Right?

I assume you meant prepended.  Please expand on what you are saying
here.  What environment variable?  Prepended by what / who?  Yes, the
kernel command line expects a full name in one of the 4 forms above.

-Joe