Regression with initramfs and nfsroot (appears to be in the dcache)

[Patrick McLean]

With 3.6-rc1 and up, when using a (dracut) initramfs with a read-only
nfs root, all accesses to /proc. /sys and /dev return EBUSY.

Bisecting finds this commit as where this was introduced:

> ee3efa91e240f513898050ef305a49a653c8ed90 is the first bad commit
> commit ee3efa91e240f513898050ef305a49a653c8ed90
> Author: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Date:   Fri Jun 8 15:59:33 2012 -0400
>
>     __d_unalias() should refuse to move mountpoints
>
>     Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
>
> :040000 040000 1d6ecde959d3f8252b33f4adff3c4bf1e67f2b92 992ec34563b90fb349957418f76d4673c1af4ab6 M fs
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