Re: [NFS] nfs-utils crossmnt/fsid bug

[Frank Filz <ffilzlnx@us.ibm.com>]

On Fri, 2007-11-23 at 13:50 +1100, Neil Brown wrote:
> On Wednesday September 5, bfields@fieldses.org wrote:
> > With an exports entry like
> > 
> > 	/exports *.citi.umich.edu(rw,crossmnt,fsid=0)
> > 
> > and some other stuff mounted under /exports, I get an odd situation
> > where listing /exports/submnt/ shows me the contents of /exports/.
> > 
> > I looks to me like what's happening is that the new code to
> > automatically export filesystems under crossmnt exports is exporting
> > those directories with the fsid option turned on, with the result that
> > the root of each of those subdirectories ends up with the same
> > filehandle as the root of /exports, and the hilarity ensues.  But I
> > haven't tried a patch yet.
> > 
> > Does that make sense?  I assume we should just clear the fsid flag on
> > submounts, as it's never going to make sense, and leave the logic
> > otherwise intact.
> > 
> > --b.
> 
> Thanks for noticing and reporting this.
> 
> Does this (untested, but it compiles) patch seem right?

In testing security negotiation, I ran into this problem. I've tried
this patch and it doesn't seem to be working right. My exports file is:

/export/home    gss/krb5i(nohide,insecure,no_subtree_check,no_root_squash,async,rw)
/export/home    gss/krb5p(nohide,insecure,no_subtree_check,no_root_squash,async,rw)
/export         gss/krb5(fsid=0,insecure,no_subtree_check,no_root_squash,async,rw,crossmnt)
/export         gss/krb5i(fsid=0,insecure,no_subtree_check,no_root_squash,async,rw,crossmnt)

>From the client I execute:

mount -overs=4,sec=krb5 elm3a19.beaverton.ibm.com:/ /mnt 
ls -l /mnt/home

I added some debug logging, and I see the different_fs path being taken
on the /export/home. I'm wondering, could there be a kernel part to this
also?

Thanks

Frank Filz


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