[Unionfs] unionfs has problems with file permissions

[Michael Tokarev]

Johannes Hirte wrote:
> 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".

This is not unique to nfs - it also happens when the ro part is on
a read-only media like CD-rom for example, or squashfs, whatever.

/mjt