how to destroy zfs parent filesystem without destroying children - corrupted file causing kernel panick

[Artem Belevich]

On Fri, Dec 28, 2012 at 12:46 PM, Greg Bonett <greg.bonett at gmail.com> wrote:

> However, I can't figure out how to destroy the /tank filesystem without
> destroying /tank/tempfs (and the other /tank children).  Is it possible to
> destroy a parent without destroying the children? Or, create a new parent
> zfs file system on the same zpool and move the /tank children there before
> destroying /tank?
>

It is possible in case parent is not the top-most zfs filesystem (i.e
tomp-most filesystem for the pool).

I.e. if your zfs filesystem layout looked like zfs-pool/tank/tempfs, then
you could simply do "zfs rename zfs-pool/tank/tempfs zfs-pool/tempfs" and
then would be free to remove zfs-pool/tank. Alas this rename semantics
breaks down when you can no longer rename sub-filesystem upward. I don't
think ZFS would allow you to promote inner filesystem to a pool which is
what you seem to want.

--Artem