On Tuesday 2011-04-12 14:10, sf...@users.sourceforge.net wrote:

>
>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.

It is a core feature of Miklos's overlayfs. Wonder when that's coming 
up in the kernel.

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