help: fail to create file in aufs

[Haipeng Wu]

hi,

I have met a problem in creating file in aufs, below is the method to
reproduce:
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mkdir /tmp/aufs
mkdir /tmp/aufs/temp
mkdir /tmp/aufs/mnt

sudo mkdir -p /tmp/aufs/root/abc
sudo chmod 700 /tmp/aufs/root/abc     ### here must be 700

sudo mount -t aufs -o br:/tmp/aufs/temp=rw:/tmp/aufs/root=ro+wh none
/tmp/aufs/mnt
sudo chmod 777 /tmp/aufs/mnt/abc

touch /tmp/aufs/mnt/abc/a   ### failed, permission denied, that's the
problem I met
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I have met the problem on both ubuntu 10.04 and 12.04.
Any suggestions for this issue?

thanks,
haipeng
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