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Introduction
pjdfstest is a POSIX file system test suite available for UFS and ZFS on FreeBSD. It's also available for extfs (Linux) and HFS+ (OSX).
History
pjdfstest was originally added to FreeBSD in the 8.x timeframe here.
In the 10.x timeframe, pjdfstest was integrated in to the FreeBSD Test Suite as an opt-in test suite here; pjdfstest is built/installed with FreeBSD when MK_TESTS != no but isn't run automatically.
Running pjdfstest
Directions for running pjdfstest can be found here.