[OpenWrt-Devel] [PATCH] add ubifs filesystem for image building system

[Daniel Golle]

On Sat, Jan 02, 2016 at 04:02:58PM +0100, Felix Fietkau wrote:
> On 2016-01-02 15:11, RhoYounJae wrote:
> > Currently, the devices which actually uses ubifs filesystem uses squashfs filesystem
> > Thus openwrt binary image have a wrong squashfs- prefix not ubifs- which gives user confusion
> > This patch add ubifs filesystem for image building system but not for legacy system
> You're right about one thing: These images do use ubifs, however only as
> an overlay. The base filesystem is squashfs, just like on all those NOR
> flash based devices (which use jffs2 as overlay).
> 
> I might accept a patch that adds ubifs as an option, if you can convince
> me that it's actually useful, but replacing the squashfs images with
> ubifs ones is not an option.

Similar to having a JFFS2 read-write-mounted rootfs without any overlay
can make sense in certain (rare) scenaria. I intended to use a ubifs
rootfs in those situations on devices which need UBI.
There already is a way to generate images having ubifs rootfs, see e.g.
https://dev.openwrt.org/browser/trunk/target/linux/oxnas/image/Makefile#L90

UBI and UBIFS image generation is still kind of a mess because not all
targets have been migrated to the 'new way' (using SysupgradeNAND and
UbinizeImage) yet. Once this is done, include/image.mk can be cleaned
up and the old stuff (still needed on targets relying on a static
ubinize.cfg) can be removed...


Cheers


Daniel
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