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I have configured my box to allow a certain user up to 2GB of storage thanks to quota.

I think I have enabled it correctly. /etc/fstab shows usrquota,grpquota, quotaon says everything is fine but I have been able to violate the quota today.

From SSH, I sudo-ed into that user and tried to create a 4GB file

# sudo -u targetuser bash ##the user cannot use SSH
targetuser@host:~> dd if=/dev/zero of=prova.bin count=4096 bs=1048536
sda1: warning, user block quota exceeded.
^C^C3592+0 records in
3592+0 records out
3766341312 bytes (3,8 GB) copied, 333,72 s, 11,3 MB/s 

edquota -u targetuser shows (after I deleted the file)

Disk quotas for user targetuser (uid 1006):
  Filesystem                   blocks       soft       hard     inodes     soft     hard
  /dev/sda1                    181200    2097072   22097072      10230        0        0

I'lve also been able to write a new file before deleting the elephant.

The question is tremendously simple: why didn't Linux stop dd from writing more instead of just warning?

What can I do to raise an error when a user attempts to write more than he's allowed to?

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