What happens if /home directory gets 100 percent usage / Debian

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http://serverfault.com – My question is pretty simple but another opinion would be nice. We have Debian [2.6.18-6-686] machine, /home is mapped like this df -h | grep home /dev/mapper/local_disc-home 6,0G 5,1G 580M 90% /home There are around 150 users folders in /home. My question is, what would happen if usage gets 100 percent. No user will be able to login and all logged users will lost terminals? Or there is some safety mechanism to keep sessions allive? If I understand this right every one user can full up the /home and that will affect all users. Thx for answers (HowTos)