Re: [PATCH 3/3] nfsd: reset access mask for NLM calls in nfsd_permission

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On Tue, 01 Apr 2025, Olga Kornievskaia wrote:
> On Mon, Mar 31, 2025 at 10:49 AM Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:
> >
> > On 3/30/25 8:10 PM, NeilBrown wrote:
> > > On Mon, 31 Mar 2025, Olga Kornievskaia wrote:
> > >>
> > >> This code would also make the behaviour consistent with prior to
> > >> 4cc9b9f2bf4d. But now I question whether or not the new behaviour is
> > >> what is desired going forward or not?
> > >>
> > >> Here's another thing to consider: the same command done over nfsv4
> > >> returns an error. I guess nobody ever complained that flock over v3
> > >> was successful but failed over v4?
> > >
> > > That is useful.  Given that:
> > >  - exclusive flock without write access over v4 never worked
> > >  - As Tom notes, new man pages document that exclusive flock without write access
> > >    isn't expected to work over NFS
> > >  - it is hard to think of a genuine use case for exclusive flock without
> > >    write access
> > >
> > > I'm inclined to leave this code as it is and declare your failing test
> > > to no longer be invalid.
> >
> > For the record, which test exactly is failing? Is there a BugLink?
> 
> Test is just an flock()?
> 

But what motivated you to perform that specific test:
  exclusive flock over NFSv3 on a file you didn't have write permission to
??

Is it part of a test suite? Or is it done by some application? or ....

NeilBrown





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