UBIFS in-place vs out-of-place GC

[Russ Dill]

On Thu, Sep 2, 2010 at 4:45 AM, Artem Bityutskiy <dedekind1 at gmail.com> wrote:
> Hi,
>
> On Wed, 2010-09-01 at 09:08 -0700, Russ Dill wrote:
>> I'm doing a bit of research on UBIFS and something I read from a few
>> sources has me confused regarding garbage collection:
>>
>> http://osl.sed.hu/~havasi/ubifs/#gc
>
> You should contact Szeged guys and ask them to remove obsolete
> information.
>
> For much more up-to-date information, see
> http://linux-mtd.infradead.org/doc/ubifs.html#L_documentation
>
>> Looking at the source, I can find the code that does the out of place
>> updates, but I can't find any references to in place updates or
>> displacement tables. What gives?
>
> We do not have displacement tables, that was some old idea which we
> never implemented.
>
> We do not have in-place GC in UBIFS. But we have so-called "in-the-gaps"
> method which we use during commit to write the FS index when we do not
> have extra empty LEBs. In the code it corresponds to the
> 'layout_in_gaps()' function.
>

Thanks much, I figured it was outdated information, I just wanted to
confirm that suspicion.