f2fs on GTA02

[Martin Jansa]

On Thu, Dec 06, 2012 at 04:19:37PM -0500, Phil Vandry wrote:
> Hello Freerunner users,
> 
> I am interested in using the new f2fs filesystem created by Kim Jaegeuk 
> at Samsung on the µSD cards of a bunch of GTA02s. Right now it's 
> undergoing testing in linux-next and there are several fresh discussion 
> threads about it on lkml. I intend to wait until the code has stabilized 
> a bit before making the attempt.
> 
> First, is this a good idea? Also, is anyone else interested?
> 
> The problem is that the code only compiles against recent Linux kernels 
> and the newest kernel available for GTA02 is 2.6.39. I see two options:
> 
> 1. Get Linux 3.7 working on the GTA02

3.2 kernel works pretty good
https://github.com/shr-distribution/linux/tree/om-gta02/3.2/master

there are branches also for 3.5 and GNUtoo is working on it.

Cheers,

> 
> 2. Get f2fs working on Linux 2.6.39
> 
> Both options are challenging but I have to go for #2 because I don't 
> have the knowledge to do #1.
> 
> For #1: There are quite a few differences between upstream 2.6.39 and 
> om-gta02-2.6.39 kernels. Some of the patches I understand and could 
> re-apply against a more recent kernel, some of them have already been 
> integrated upstream, but others are mysterious to me and even if I could 
> apply them I can't guess whether or not they ought to still be applied. 
> One big issue is that the glamo driver is not present upstream (and 
> ar6000 also?).
> 
> For #2: I have already prepared a patch to backport f2fs to 
> 2.6.34/2.6.39 but there have been quite a lot of changes in the vfs and 
> other areas in the intervening time. The patch is 817 lines long. Most 
> of it is straightforward, though there were one or two tricky bits. The 
> only thing I have achieved so far is getting it to compile with no 
> errors and no warnings. That's a start, but it's not a guarantee that 
> the filesystem will actually work!
> 
> A significant problem with #2 is maintenance and bug fixes going 
> forward. I would have to backport all future changes to f2fs.
> 
> Anyway, for the information of anyone who's interested, I plan to at 
> least give option #2 a try and see if I might be lucky :-)
> 
> -v
> 
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-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
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