Re: [PATCH] Extended attribute fixes, etc.

From: Andreas Gruenbacher (
Date: Wed Feb 12 2003 - 06:03:58 EST

On Tuesday 11 February 2003 21:32, Andrew Morton wrote:
> Andreas Gruenbacher <> wrote:
> > Hi Andrew,
> >
> > here are five patches against 2.5.60. Each file contains a brief
> > description of what it does.
> Minor point:
> ext3_journal_stop() can return an error code - most notable -EIO if
> it was a synchronous transaction, or the filesystem has detected
> corruption.

Thanks, I have overlooked this third bug. An incremental patch on top of
my previous kernel_lock_bug.diff is attached. (I have also uploaded the
patches to <> in the meantime).

> > The third to fifth are all steps towards trusted extended
> > attributes, which are useful for privileged processes (mostly
> > daemons). One use for this is Hierarchical Storage Management, in
> > which a user space daemon stores online/offline information for
> > files in trusted EA's, and the kernel communicates requests to
> > bring files online to that daemon. This class of EA's will also
> > find its way into XFS and ReiserFS, and expectedly also into JFS in
> > this form. (Trusted EAs are included in the 2.4.19/2.4.20 patches
> > as well.)
> So is this new code actually functional yet? As in: something
> in-kernel using it?
> If not, what is involved in completing the kernel side of trusted
> EA's?

The important point for me now is to get the iops xattr-flags and
xattr-flags-policy patches into 2.5 so that the API won't change during
2.6. The xattr-trusted patch only affects file systems locally, so it's
far less critical.

The kernel side of trusted EAs is completely implemented with the
patches I sent. In the future there will very likely be modules
actually making use of the XATTR_KERNEL_CONTEXT flag, but Trusted EAs
are quite useful from user space alone.


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