NFSv3 / VFS and group problems

[Philip Lawatsch]

Hi,

I've had the joy to debug a production system with a really crappy setup.

They have a user "fred" which belongs to ~5000 groups (say 
group1-group5000).


So far so bad. Even worse, they have a nfs backend  with lots of files 
which are owned by users belonging to these groups.

Ok, now my problem is that "fred" can open a file which is

-rw-rw----  someone group300 foo

but a read on this file will fail with EIO

Since group300 is way beyond the 16 groups nfs supports shouldn't fred 
actually get a EACCES back from the open call?

Problem happens with 2.6.13 (vanilla, not tainted) on both server and 
client.


kind regards Philip
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