From: Liam Helmer (lists_at_strongboxlinux.com)
Date: Tue 13 Jul 2004 - 01:29:32 BST
Yup. The patch we did on IRC is working like a charm.
Incidentally, the squashfs maintainer pointed to the XID tagging issues
as well, saying that that was likely it.
Cheers,
Liam
On Mon, 2004-07-12 at 23:19, Herbert Poetzl wrote:
> On Mon, Jul 12, 2004 at 07:58:07PM +0000, Liam Helmer wrote:
> > Hey Herbert,
> >
> > We chatted a bit about this on IRC, but I wanted to try and get this
> > resolved, so I'll make a more thorough report on the matter:
> >
> > I'm using kernel 2.6.7 with vserver 1.9.2-rc5.
> > The problem I'm running into is with the squashfs file system
> > (http://squashfs.sf.net). This bug affects both the development version
> > (2.0Alpha) and the stable version (1.3r3).
> >
> > I'm using the new vserver tools: version 0.29.214. The problem is not
> > with the legacy tools, it's only with the new tools/system calls. It
> > only affects vserver > 1.9.1... 1.9.1 seems unaffected by this.
> >
> > So, the simplest test scenario:
> >
> > 1) Create a squashfs file with binary excecutables in it
> > 2) Mount it as a loop device
> >
> > Then excecute:
> > 3) #vcontext --create --xid 100 md5sum /loopdir/*
> > 4) #vcontext --create --xid 101 md5sum /loopdir/*
> >
> > The second command (in context 101) will fail, with each file giving
> > permission denied messages.
> >
> > If you then excecure:
> >
> > #vcontext --create --xid 100 md5sum /loopdir/*
> >
> > That will work fine.
> >
> > Also, if you do md5sum /loopdir/* beforehand from context 0, you'll get
> > no errors in either context.
> >
> > My current theory is that the filesystem cache that squashfs creates for
> > one virtual context is unreadeable by other virtual contexts, resulting
> > in the permission denied errors. Squashfs is a compressed filesystem, so
> > it creates it's own filesystem cache to speed up read times. I've sent
> > off a couple of emails to the creator of squashfs as well.
> >
> > So, do you have any ideas as to how this could be resolved?
>
> yep, seems like the xid is used even on non tagxid
> filesystems for new inodes, this is a bug and will
> be fixed in the next release ...
>
> thanks,
> Herbert
>
> > Thanks!
> > Liam
> >
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