RE: Questions about ubifs,ubi and mtd?

[武井 克明 <takei744@xxxxxxx>]

Dear Richard,

We appreciate your precious advice.
We understood the quality status of kernel 3.2.26.
>From now on, we would like to backport from the latest UBI and UBIFS.
Do you think that it is enough to backport the next part?
 - drivers/mtd
 - drivers/mtd/ubi
 - fs/ubifs

Best regards,
Katsuaki Takei/Oki Electric Industry Co., Ltd./JP


> -----Original Message-----
> From: Richard Weinberger <richard@xxxxxx>
> Sent: Wednesday, December 12, 2018 6:20 PM
> To: 武井 克明 <takei744@xxxxxxx>; linux-mtd@xxxxxxxxxxxxxxxxxxx
> Subject: Re: Questions about ubifs,ubi and mtd?
> 
> Hello Katsuaki Takei,
> 
> Am Mittwoch, 12. Dezember 2018, 02:07:33 CET schrieb 武井 克明:
> > Dear Richard,
> >  Thank you for your comment.
> >  We are using kernel 3.2.26 for reasons.
> >  I can not update the kernel right now.
> 
> 3.2.x is dead.
> It contains bugs, security problems, is unmaintained, etc...
> Shipping with 3.2.x is a very bad idea.
> 
> > To everyone
> > Is there a lot of fixes and patches for processing that causes abnormal
> behavior as I asked you?
> > We hope to solve the problem by patch to kernel 3.2.26. if possible.
> > Shyly, I have little experience of developing ubifs or ubi, and I can not yet
> figure out which program is likely to be involved in this abnormal operation(ref.
> Note*).
> >
> > Note*:
> > Nevertheless, when loading our program from 'rootfs-a', trying to read the
> inode with the ubifs_read_node() function will result in "bad node type" (ex: 193
> but expected 9) and the LEB can not be read with the expected value. (Even
> though you do not have write access to rootfs) In addition, the file size may be 0
> byte in some cases.
> 
> The problem could be anything.
> Both UBI and UBIFS faced tons of fixes over the last years.
> Maybe it is also bug somewhere else.
> 
> You could try backporting the whole UBI and UBIFS subsystems to your kernel.
> 
> Thanks,
> //richard
> 

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