zfs: the exponential file system from hell

[Edho Arief]

On Wed, Oct 2, 2013 at 4:12 AM, Xin Li <delphij at delphij.net> wrote:
>
> I don't think 'zfs list' reports the "right" numbers either: there is no
> notion of "available shared space between this, this and this file
> systems".  The underlying problem is that it's always hard to represent
> mutli-dimensional value in a linear manner, to do it, we would need to
> create something new.
>

Considering df output for UFS is never `size = used + avail` anyway,
is there any problem with having df output for zfs to:

- size: total size (zpool-wide, sans redundancy)
- used: specific filesystem usage
- avail: total available space

?

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