Backporting ubiblock to Linux 3.3

Backporting ubiblock to Linux 3.3

[Konstantin Tokarev]

Hi Ezequiel and others,

How do you think, would it be feasible to backport ubiblock to Linux 3.3 without large amount of work? I don't need latest and greatest version, just anything to get working and stable squashfs on top of it.

Could you point me to any specific version of ubiblock patch to start from? Should I apply patches from [1] first? Or any specific patches to UBI or MTD which are missing in that branch?

Thank you in advance.

[1] http://git.infradead.org/users/dedekind/ubifs-v3.3.git

-- 
Regards,
Konstantin

Re: Backporting ubiblock to Linux 3.3

[Richard Weinberger]

On Tue, Sep 15, 2015 at 2:31 PM, Konstantin Tokarev <annulen@yandex.ru> wrote:
> Hi Ezequiel and others,
>
> How do you think, would it be feasible to backport ubiblock to Linux 3.3 without large amount of work? I don't need latest and greatest version, just anything to get working and stable squashfs on top of it.

Backporting the state before my blk-mq conversion should be trivial.

-- 
Thanks,
//richard

Re: Backporting ubiblock to Linux 3.3

[Ezequiel Garcia]

Konstantin,

On 15 September 2015 at 09:31, Konstantin Tokarev <annulen@yandex.ru> wrote:
> Hi Ezequiel and others,
>
> How do you think, would it be feasible to backport ubiblock to Linux 3.3 without large amount of work? I don't need latest and greatest version, just anything to get working and stable squashfs on top of it.
>

Yes, this should be feasible and not too complex.

> Could you point me to any specific version of ubiblock patch to start from? Should I apply patches from [1] first? Or any specific patches to UBI or MTD which are missing in that branch?
>

On 15 September 2015 at 11:01, Richard Weinberger
<richard.weinberger@gmail.com> wrote:
[..]
> Backporting the state before my blk-mq conversion should be trivial.

As Richard says, you'll want to avoid the blk-mq conversion. I'd say
starting with v3.18 should
be sufficient:

$ git log v3.18.21  --reverse --no-merges --oneline -- drivers/mtd/ubi/block.c
9d54c8a UBI: R/O block driver on top of UBI volumes
4d283ee UBI: block: do not use term "attach"
ca2b722 UBI: block: Mark init-only symbol as __initdata
9981e14 UBI: block: Use 'u64' for the 64-bit dividend
8af8718 UBI: rename block device ioctls
d56030a UBI: block: Remove __initdata from ubiblock_param_ops
b4f42e2 block: remove struct request buffer member
bebfef1 UBI: avoid workqueue format string leak
151d6b2 UBI: block: Fix error path on alloc_workqueue failure
495f2bf UBI: block: Make ubiblock_resize return something
0a3d571 UBI: block: Set disk_capacity out of the mutex
4df3892 UBI: block: Avoid disk size integer overflow
3df7707 UBI: block: fix dereference on uninitialized dev
978d649 UBI: block: Fix block device size setting
06d9c29 UBI: block: Add support for the UBI_VOLUME_UPDATED notification

And you might want to backport this one too:

commit eb20e69ac83a1e4d764a49bf671e1e2e5dc4c15c
Author: Kevin Cernekee <cernekee@chromium.org>
Date:   Wed Apr 22 09:30:53 2015 -0300

    UBI: block: Add missing cache flushes

-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar