about porting ubiblock to make squashfs work on it

about porting ubiblock to make squashfs work on it

[ayaka]

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Hello,
   I will do a overlayfs on nand flash, about overlayfs, I will ask
linux-fsdevel for help, now I want to talking about ubiblcok.
As I know that the squashfs is not suitable for raw nand flash, so I
need the ubiblock to manage the nand flash then I will create a squashfs
on it as the lower of overlayfs, about the upper, I will try, ubifs,
jffs2 and logfs. The real work I do is writing a report about
achieving a restoring function.
   The kernel I am going to use maybe the 3.10 version, as my platform
 is samsung s3c6410, I have made that version worked using the board file.
P.S if there is any information about overlayfs and porting overlayfs,
don't mind to offer it to me, I will thank you.


thank you

ayaka
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Re: about porting ubiblock to make squashfs work on it

[Ezequiel Garcia]

On Mar 06, ayaka wrote:
> 
>    I will do a overlayfs on nand flash, about overlayfs, I will ask
> linux-fsdevel for help, now I want to talking about ubiblcok.
> As I know that the squashfs is not suitable for raw nand flash, so I
> need the ubiblock to manage the nand flash then I will create a squashfs
> on it as the lower of overlayfs, about the upper, I will try, ubifs,

Putting squashfs on top of an UBI volume can be achieved using a recent
UBI feature, that allows block creation on UBI volumes.

You can find the latest kernel patches at:

http://git.infradead.org/linux-ubifs.git

These patches are very easy to backport on v3.10 (I use them on v3.2).

The website documentation should be updated soon, but here's something
until that happens:

http://patchwork.ozlabs.org/patch/323628/

The userspace tool to handle this will be pushed soon.
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com

Re: about porting ubiblock to make squashfs work on it

[ayaka]

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 2014 03 06 19:33, Ezequiel Garcia wrote:

> 
> You can find the latest kernel patches at:
> 
> http://git.infradead.org/linux-ubifs.git
> 
I have backported that driver into my kernel(3.10.y branch), now I have
deply a squashfs on it and mount it successfully.
I wonder whether I could use any filesystem in it(like ext2 without
write). It is the greatest thing, I could have a read-only filesystem as
the lower of overlayfs in nand mtd.
It seems that ubi.block kernel parameters won't work, I just copy all
file in driver/mtd/ubi from git and include/uapi/mtd/ubi-user.h , I am
not familar with git and that tree has a delta unsolved so I failed in
99%,
what worse, that repo is quite slowly in my country.

I wise I could done overlayfs backport later.

Thanks your work and all mtd and ubi developers.


ayaka
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