Zfs destroy DOES NOT CHECK NFS mount file-systems

I asked this question twitter once and the answer was a good one, but I did some checking today and was surprised!!
# zfs destroy mypool/home/andrew
The above command will destroy this file-system no questioned asked but if the file-system is mounted you will get back the Device busy and if you have snapshot then they will be protected as well
server# zfs destroy mypool/home/andrew
cannot unmount 'tank/home/andrew
server# zfs destroy dpool/staff/margaret
cannot destroy 'dpool/staff/margaret': filesystem has children
use '-r' to destroy the following datasets:
dpool/staff/margaret@Wed18
dpool/staff/margaret@Wed22
BUT?
server# zfs destroy dpool/staff/margaret@Wed18
server# zfs destroy dpool/staff/margaret@Wed22
NFSclient# cd /home/margaret
NFSlient# ls -l
drwx------+ 2 margaret staff 2 Aug 29 17:06 Mail
lrwxrwxrwx 1 margaret staff 4 Aug 29 17:06 mail -> Mail
drwx--x--x+ 2 margaret staff 2 Aug 29 17:06 public_www
server# zfs destroy dpool/staff/margaret
server#
GONE!!!
I will file a bug report to see what Oracle say!
Comments?
I think there should be a hold/protect of file-systems
# zfs hold dpool/staff/margaret
Andrew

The CR is already filed:
6947584 zfs destroy should be recoverable or prevented
The zfs.1m man page, which covers the mounted case and the ZFS admin guide are pretty clear
about the current zfs destroy behavior.
http://docs.oracle.com/cd/E23824_01/html/821-1448/gamnq.html#gammq
Caution - No confirmation prompt appears with the destroy subcommand. Use it with extreme caution.
zfs destroy [-rRf] filesystem|volume
Destroys the given dataset. By default, the command
unshares any file systems that are currently shared,
unmounts any file systems that are currently mounted,
and refuses to destroy a dataset that has active depen-
dents (children or clones).
I'm sorry that you were surprised.
Accidents happen too, like destroying the wrong file system, so always have good backups.
Thanks, Cindy

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