pure-ftpd --with-virtualchroot

./configure --with-virtualchroot
此參數讓 link 不受 chroot 的限制, 好用
http://www.pureftpd.org/README

--with-virtualchroot: usually, when an user is chrooted (-A and -a
options), it's impossible to go out of his home directory. Enabling that
feature makes it possible: symbolic links are always followed, even if they
are pointing to directories not located in the user's home directory. This
is very useful for having shared directories (for instance, have a symbolic
link to /var/incoming in every home directory) .
This feature isn't enabled by default.

./configure --with-sysquotas
使用系統 quota