How to fix zfs mount failure due to space full in Solaris 11

When a zfs file system becomes absolutely full it won't allow you to remove any files.
You will also not be able to set any properties on the file system.

I came across a situation wherein a zone was in installed state & was unable to boot & gave the following error:

root@global:~# zoneadm -z localzone boot
zone 'localzone': cannot set 'zoned' property for zone dataset 'localzone_dpool01'
zone 'localzone':
zoneadm: zone 'localzone': call to zoneadmd failed

The issue was that the pool localzone_dpool01 was full.

root@global:~# zfs list | grep -i localzone_dpool01
localzone_dpool01                         29.3G      0  31K    none
localzone_dpool01/u00                     29.3G      0  29.3G  /u00

Conventional attempts to manually mount the file system belonging to the pool on the global zones also failed.

Finally, the file system could be mounted with the following options:

zfs mount -vO -o mountpoint=/mnt localzone_dpool01/u00

Before mounting the file system with the above command the zone needs to be detached first.

After the file system is mounted & space is cleared attach & boot the zone.
The zone should get booted successfully now.