dummy ZFS filesystem checker
is a thin shell wrapper that at most
checks the status of a dataset's container pool. It is installed by OpenZFS
because some Linux distributions expect a fsck helper for all filesystems.
If more than one dataset
is specified, each is
checked in turn and the results binary-ored.
ZFS datasets are checked by running
on the containing pool. An individual
ZFS dataset is never checked independently of its pool, which is unlike a
However, the fsck(8)
interface still allows it to
communicate some errors: if the dataset
a degraded pool, then
exit code 4
to indicate an uncorrected filesystem
Similarly, if the dataset
is in a faulted pool
and has a legacy /etc/fstab
will return exit code
to indicate a fatal operational error.