Re: stale nfs file handle with exported loopback mounts

["J. Bruce Fields" <bfields@fieldses.org>]

On Fri, Nov 02, 2007 at 03:23:17PM -0400, J. Bruce Fields wrote:
> On Fri, Nov 02, 2007 at 08:06:58PM +0100, devzero@web.de wrote:
> > hi!
> > 
> > it seems i was having weird mail problems with sending mails trough my webmailer - at least two followups with attachments seem to be lost on sending and are not in my sent folder anymore....
> > 
> > anyway - here is a second try, but probably worse than what i have written before :)
> > 
> > 
> > first off, thanks for the patch Neil, things look _much_ better now and exporting loopback mounts now basiscally works again.
> > nice to see that my posting helped finding bugs.
> > 
> > maybe i have two more bugs for you :)
> > 
> > i have loopback mounts on the server and exported the parent dir with crossmnt option.
> > 
> > after mounting for the first time on the client, i`m getting "Invalid argument" for each loopback-mounted dir, if i do an ls -la on /mnt.
> > this only happens _once_ and seems to be a server problem, because i can reboot the client and remount , i never see that errors again.
> 
> >From a quick look at the trace (thanks)--there's some getacl calls that
> return EINVAL, then a few milliseconds later a second reply returns with
> the original data.  That looks suspiciously like a reply being sent when
> the request was also deferred pending the upcall to deal with the newly
> encountered filesystem.  Sure enough, in
> fs/nfs/nfs3acl.c:nfsd3_proc_getacl(), there's
> 
> 	 if ((nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP)))
> 		RETURN_STATUS(nfserr_inval);
> 
> Change that nfserr_inval to an nfserr (here and in
> fs/nfs/nfs2acl.c:nfsd_proc_getacl()), and maybe the problem will go
> away.

(I've been seeing some odd spurious replayed replies in the nfsv4 case
as well, by the way--I suspect it's a similar problem, but haven't had
the chance to track it down yet....)

--b.

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