[Unionfs] Can't mount NFS-exported union anymore in unionfs-1.4

[hooanon05 at yahoo.co.jp]

Wilhelm Meier:
> Here it comes:
> 
> unionfs_interpose: c126c800, b0, hi425997
> read_uin: c126c800, b0, i425997 f0x40, cfd10ca4
> read_uin:543
> BUG: unable to handle kernel NULL pointer dereference at virtual address 
> 00000008

I could reproduce the problem.
The bug is related to parsing options.
- remove all pathces and use plain unionfs-1.4.
- If you meet a compile error, fix it by referencing my previous
  patches. you don't need entire patch, just to fix the compile error.
- specify imap option AFTER dirs option.
- you don't need to create and specify two revmaps unless your branches
  are on the same filesystem.


Junjiro Okajima