[PATCH v6 12/15] ubi: fastmap: Add all fastmap pebs into 'ai->fastmap' when fm->used_blocks>=2

[Zhihao Cheng]

> FYI, I think I understand now our disagreement.
> You assume that old Fastmap PEBs are *guaranteed* to be part of Fastmap's erase list.
> That's okay and this is what Linux as of today does.
> 
> My point is that we need to be paranoid and check carefully for old Fastmap PEBs
> which might be *not* on the erase list.
> I saw such issues in the wild. These were causes by old and/or buggy Fastmap
> implementations.
> Keep in mind that Linux is not the only system that implements UBI (and fastmap).
Uh, that is really a point, I met UBI implemented in Vxworks ever. Now, 
you convinced me, we should process fastmap with considering bad 
images(caused by other implementations). Let's keep this wonky assertion 
until a better fix.
> 
> So let me give the whole situation another thought on how to improve it.
> I totally agree with you that currently there is a problem with fm->used_blocks > 1.
> I'm just careful (maybe too careful) about changing Fastmap code.
> 
> Thanks,
> //richard
> .
>