I don't use quotas, and don't know a great deal about how they operate, but I
think there's another disk filling DOS involving hard links lurking which the
above measure would also solve.

If a user starts making hard links to (large and growing) log files, with the
new links being placed in /var/mail, then presumably those log files will not be
deleted correctly as they are rolled over, and will quickly accumulate.

This could not bring down a system as rapidly as growing the publicly writable
directory with lots of links, but it is not desirable system behaviour.

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