[Unionfs] unionfs has problems with file permissions

[Johannes Hirte]

Ok second try, since my first mail didn't reached the ML.

I run into write problems with unionfs and nfs and found this thread on
the ML:

http://www.fsl.cs.sunysb.edu/pipermail/unionfs/2008-November/005949.html

This describes pretty good my problem. I'm booting from network into an
initrd, mounting a tmpfs (rw) and a nfs-export (ro) together with
unionfs. The problem is, I can't modify a file from the nfs. Deleting
or creating is no problem, only modifying ends in "Permission denied".
I can do a chmod 600 on this files. Then this file can be modified. The
behavior was reproducible with kernel 2.6.27.13 and 2.6.24.4 with
unionfs-2.5.1. A 2.6.24.4 setup with unionfs 2.3.2. A solution would be
really good cause this is a showstopper for updating this netboot
environment.

Johannes