How does one mount an existing jffs2 partition so it is writeable?

[Jamey Hicks]

David Woodhouse wrote:

>ch at murgatroid.com said:
>  
>
>> Do you need to unlock your flash before you can write to it?  That's
>>not done automatically by mtd or jffs2.  There's a diff in the ARM
>>patch system by me that might be applicable. 
>>    
>>
>
>I'm beginning to wonder if we should make JFFS2 unlock automatically if it 
>finds at least some JFFS2 nodes. Or put in the 'is_flash_locked' method and 
>make JFFS2 notice that it's locked _before_ trying to write to it, and 
>print an appropriate message and mount in read-only mode so it doesn't even 
>let you _try_ to write to it.
>  
>
I would much rather that JFFS2 not unlock blocks automatically.  We tend 
to lock blocks for a reason (e.g., so that we don't accidentally erase 
the boot loader with incorrect mount options).  I think it would be 
reasonable for JFFS2 to query whether flash is locked beforehand and to 
mount read-only.  I think it would also be reasonable to provide a mount 
option directing it to unlock flash.  

Jamey