Jan Engelhardt:
> mount -t aufs -o br:/home=ro:/var=ro none /mnt
> mount -t aufs -o br:sometmpfs=rw:/mnt/foo=ro none /mnt/foo
>
> would seem to be the logical step, though I can't say whether aufs 
> properly takes a reference on the old /mnt/foo before adding the 
> vfsmount.

After the first mount, "/mnt" is aufs.
So in the second mount, you are going to mount aufs over another aufs.
For the branch fs, you cannot use aufs.
In aufs1 era, it was supported (CONFIG_AUFS_ROBR, "Aufs as an readonly
branch of another aufs mount").
But it is dropped now.


J. R. Okajima

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