From what i can see your /tmp is backed by a loop mounted file.
The easiest way to expand it (if you don't care for the data there). One possible way to do it is with dd:
- dd if=/dev/zero of=/var/tmpMnt bs=2M count=5120 - will create 10G empty file (needs to be formatted with a filesystem afterwards)
- dd if=/dev/zero of=/var/tmpMnt bs=1 count=0 seek=10G - will create empty and SPARSE file that (needs to be formatted with an FS
Additionally looking over the setup:
- it is not recommended to use /tmp backed by a file - it increases the load.
- your root is quite big. I really can't imagine what you are going to put in a 1T root partition. I would advise on shrinking it to something smaller.
- generally with this setup i would recommend to look into LVM for more flexible space allocation.