Re: Bug in NFSV3 ACCESS Procedure reply

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

On Thu, Aug 28, 2008 at 02:22:35PM -0700, Dilip Kumar wrote:
> I was writing some scripts to map the Unix access modes to the access
> flags in the NFS ACCESS Reply. I have run these scripts on Linux and
> Solaris machines and the results were not the same. If I have some C
> program which opens this directory in a write mode exported by an NFS
> server it succeeds, if the server is Solaris, but fails if the server
> is Linux. If I have write access on the directory, I would expect to
> see write bit set for that directory in the ACCESS reply. Programs
> like mkdir or cd require execute and write access to complete their
> operations, but a normal open with write mode should succeed in either
> case. I was more concerned about the differences in the implementation
> of ACCESS in two different servers.

Behavior that's different from Solaris probably merits investigation,
but on its own that's not justification for making a change.

It sounds like this isn't a real problem for you, just a result you
observed in some tests, so for now I'm not inclined to worry about it
very much.  If you want to pursue it, you're welcome to make a patch
(it's probably just a matter of adjusting those accessmap arrays in
fs/nfsd/vfs.c), and you may well be correct to do so, but the patch will
need to come with a more persuasive argument.

--b.