Comment 81 for bug 1048059

> Mounting as ext4 enables acl by default, but mounting as ext3 doesn't (see the linux kernel documentation).

For the record, I cannot reproduce this as I already said in my earlier comment when I tried it with ext2:

sudo modprobe scsi_debug
sudo mkfs.ext3 /dev/sdb
sudo mount /dev/sdb /media/
sudo touch /media/test.txt
sudo setfacl -m u:www-data:r /media/test.txt

This all works, and I correctly get
$ sudo getfacl /media/test.txt
user::rw-
user:www-data:r--
[...]