JFFS2 Extended attributes support & SELinux in handhelds

JFFS2 Extended attributes support & SELinux in handhelds

[Lorenzo Hernández García-Hierro]

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Hi,

I've been working in implementing extended attributes support in the
JFFS2 filesystem.

During the (short) time I worked on it, I just decided to try to bring
back the thread on SELinux in hand-held and embedded devices and see if
there's someone interested in contributing to it and collaborating to
make something out of it.

The current work is just a draft, I've started with the standard Vanilla
kernel sources plus mtd JFFS2 sources, used to patch the vanilla ones
for latest code (I'm confused on which one has the most updated tree or
if there are special differences between mtd's trees and vanilla's), and
implemented the skeleton using the reiserfs xattr code base.

Then Russell Coker commented to me that I should use the handhelds.org
kernel, so, I have the doubt on which one use, even if porting the
changes made to JFFS2 code base to vanilla sources wouldn't be
difficult, at least I suppose.

I've opened a few wiki pages for discussion and documenting until it
gets further developed:

	http://wiki.tuxedo-es.org/tuxedo/JFFS2xattr
	http://wiki.tuxedo-es.org/tuxedo/SELinuxEmbedded

In addition, having someone experienced with xattr API could be great,
as development documentation seems inexistent, among James Morris'
merged xattr consolidation code.

Thanks in advance,
Cheers.
-- 
Lorenzo Hernández García-Hierro <lorenzo@gnu.org> 
[1024D/6F2B2DEC] & [2048g/9AE91A22][http://tuxedo-es.org]

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Re: JFFS2 Extended attributes support & SELinux in handhelds

[Josh Boyer]

On Tue, 2005-02-22 at 17:17 +0100, Lorenzo Hernández García-Hierro
wrote:
> Hi,
> 
> I've been working in implementing extended attributes support in the
> JFFS2 filesystem.

You should send this to the JFFS2 development list.  The xattr support
is probably a JFFS3 candidate.

> 
> The current work is just a draft, I've started with the standard Vanilla
> kernel sources plus mtd JFFS2 sources, used to patch the vanilla ones
> for latest code (I'm confused on which one has the most updated tree or
> if there are special differences between mtd's trees and vanilla's), and
> implemented the skeleton using the reiserfs xattr code base.

The mtd tree is the most current.  Any development would probably get
the most benefit from being done there.  Especially since JFFS3 doesn't
exist anywhere else :).

> In addition, having someone experienced with xattr API could be great,
> as development documentation seems inexistent, among James Morris'
> merged xattr consolidation code.

There have been some xattr proposals discussed on the MTD and JFFS2
mailing lists.  They might be a starting place for you.

josh

Re: JFFS2 Extended attributes support & SELinux in handhelds

[Lorenzo Hernández García-Hierro]

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El mar, 22-02-2005 a las 12:21 -0600, Josh Boyer escribió:
> You should send this to the JFFS2 development list.  The xattr support
> is probably a JFFS3 candidate.
> 
> The mtd tree is the most current.  Any development would probably get
> the most benefit from being done there.  Especially since JFFS3 doesn't
> exist anywhere else :).

As we have talked in #mtd, I've moved everything to JFFS3 code and
re-worked the pretty basic stuff that was already done, as a really
dirty night-hack.

I hadn't time to fix the remaining errors (no, it's not a working
patch), nor the remaining "stolen" ReiserFS code that needs to be
modified in order to make JFFS3 happy with it (priv. directory handling
in xattr initialization, etc).
I'm going to have limited time for it, I have exams these two weeks and
also finish some other work in progress.

I've uploaded a patch that applies to 2.6.11-rc4 tree, with latest mtd
tree included.

http://pearls.tuxedo-es.org/patches/mtd-jffs3-xattr-20050222-2.6.11-rc4.patch
(998Kb)

I would appreciate any collaboration and help with it.

Cheers, thanks in advance and enjoy (not working) it.
:)
-- 
Lorenzo Hernández García-Hierro <lorenzo@gnu.org> 
[1024D/6F2B2DEC] & [2048g/9AE91A22][http://tuxedo-es.org]

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