Re: [PATCH] nfs4.0 tests: discover max supported file size

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On Mon, Nov 23, 2015 at 10:17:21PM +0100, Mkrtchyan, Tigran wrote:
> 
> On Nov 23, 2015 20:49, "J. Bruce Fields" <bfields@xxxxxxxxxxxx> wrote:
> >
> > On Mon, Nov 23, 2015 at 09:27:02AM +0100, Tigran Mkrtchyan wrote: 
> > > current implementation amuses, that all servers 
> > > support 64-bit file sizes. This is not always true. 
> > > Use FATTR4_MAXFILESIZE attribute to discover supported 
> > > maximum. Update LOCK6 test to use it. 
> >
> > The language at http://tools.ietf.org/html/rfc7530#section-16.10.4 isn't 
> > as clear as it could be, but I think INVAL at least is unambiguously 
> > wrong in the case you're testing (it should be BAD_RANGE or OK). 
> >
> > My interpretation is actually that we should return: 
> >
> > - INVAL for 64-bit overflow, otherwise 
> > - BAD_RANGE for 32-bit overflow on 32-bit server, otherwise 
> 
> Hm...our server is a bit weird. The file size is 63 bit :)

Poking around.... I think on Linux locks use signed 64-bit quantities
too, and that's probably normal.  If somebody wants to sort this out,
they're welcome....

But in any case, I think the existing test is still right--it'll
overflow on any server, and should result in EINVAL.

And I think your revised test is wrong in general--maximum filesize
isn't necessarily the same thing as maximum lock range, and EINAL isn't
necessarily the correct error in all these cases.

--b.

> 
> Tigran.
> > - OK for ranges that extend past FATTR4_MAXFILESIZE.  (You're 
> >   allowed to lock ranges not in the file.) 
> >
> > So I prefer the test as-is, but might be open to argument about whether 
> > this is the most important case to be testing. 
> >
> > --b. 
> >
> > > 
> > > Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@xxxxxxx> 
> > > --- 
> > >  nfs4.0/nfs4lib.py             | 6 ++++++ 
> > >  nfs4.0/servertests/st_lock.py | 3 ++- 
> > >  2 files changed, 8 insertions(+), 1 deletion(-) 
> > > 
> > > diff --git a/nfs4.0/nfs4lib.py b/nfs4.0/nfs4lib.py 
> > > index 5031feb..41870dc 100644 
> > > --- a/nfs4.0/nfs4lib.py 
> > > +++ b/nfs4.0/nfs4lib.py 
> > > @@ -587,6 +587,12 @@ class NFS4Client(rpc.RPCClient, nfs4_ops.NFS4Operations): 
> > >          d = self.do_getattrdict([], [FATTR4_LEASE_TIME]) 
> > >          return d[FATTR4_LEASE_TIME] 
> > >  
> > > +    def getMaxFileSize(self): 
> > > +        """Get maximum supported file size""" 
> > > +        d = self.do_getattrdict([], [FATTR4_MAXFILESIZE]) 
> > > +        return d[FATTR4_MAXFILESIZE] 
> > > + 
> > > + 
> > >      def create_obj(self, path, type=NF4DIR, attrs={FATTR4_MODE:0755}, 
> > >                     linkdata="/etc/X11"): 
> > >          if __builtins__['type'](path) is str: 
> > > diff --git a/nfs4.0/servertests/st_lock.py b/nfs4.0/servertests/st_lock.py 
> > > index d54614d..80518f4 100644 
> > > --- a/nfs4.0/servertests/st_lock.py 
> > > +++ b/nfs4.0/servertests/st_lock.py 
> > > @@ -189,8 +189,9 @@ def testLenTooLong(t, env): 
> > >      """ 
> > >      c = env.c1 
> > >      c.init_connection() 
> > > +    max_size = c.getMaxFileSize(); 
> > >      fh, stateid = c.create_confirm(t.code) 
> > > -    res = c.lock_file(t.code, fh, stateid, 100, 0xfffffffffffffffe) 
> > > +    res = c.lock_file(t.code, fh, stateid, 100, max_size) 
> > >      check(res, NFS4ERR_INVAL, "LOCK with offset+len overflow") 
> > >  
> > >  def testNoFh(t, env): 
> > > -- 
> > > 2.5.0 
> > -- 
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