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Subject: Re: Find & remove orphan LEBs from UBIFS partition
From: Artem Bityutskiy <dedekind1@gmail.com>
To: Konstantin Tokarev <annulen@yandex.ru>
Date: Fri, 17 Jan 2014 17:06:01 +0200
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On Fri, 2014-01-17 at 19:03 +0400, Konstantin Tokarev wrote:
> 
> 17.01.2014, 18:59, "Artem Bityutskiy" <dedekind1@gmail.com>:
> > On Fri, 2014-01-17 at 13:39 +0400, Konstantin Tokarev wrote:
> >
> >>  Hi all,
> >>
> >>  How can I find and remove LEBs which don't correspond to known files
> >>  using internal API of UBIFS?
> >>  AFAIU, somethinng like this is done on recovery during mount, but in
> >>  my case superblock is not dirty, so I'd like to force cleanup with
> >>  custom mount option.
> >
> > Are you trying to do something like 'secure deletion' ? Disclosing your
> > intentions would help understanding what you need. I do not quite
> > understand.
> >
> > Do you want to fine all LEBs which do not contain anything useful like
> > data or meta-data, and unmap them?
> 
> Yes, exactly.

Check 'fixup_free_space', it iterates over all useful ones, the rest can
be unmapped.

-- 
Best Regards,
Artem Bityutskiy