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.\"
.\" CDDL HEADER START
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
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.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\" CDDL HEADER END
.\"
.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
.\"
.Dd May 26, 2021
.Dt FSCK.ZFS 8
.Os
.
.Sh NAME
.Nm fsck.zfs
.Nd dummy ZFS filesystem checker
.Sh SYNOPSIS
.Nm
.Op Ar options
.Ar dataset Ns No …
.
.Sh DESCRIPTION
.Nm
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.
.Pp
If more than one
.Ar dataset
is specified, each is checked in turn and the results binary-ored.
.
.Sh OPTIONS
Ignored.
.
.Sh NOTES
ZFS datasets are checked by running
.Nm zpool Cm scrub
on the containing pool.
An individual ZFS dataset is never checked independently of its pool,
which is unlike a regular filesystem.
.Pp
However, the
.Xr fsck 8
interface still allows it to communicate some errors: if the
.Ar dataset
is in a degraded pool, then
.Nm
will return exit code 4 to indicate an uncorrected filesystem error.
.Pp
Similarly, if the
.Ar dataset
is in a faulted pool and has a legacy
.Pa /etc/fstab
record, then
.Nm
will return exit code 8 to indicate a fatal operational error.
.Sh SEE ALSO
.Xr fstab 5 ,
.Xr fsck 8 ,
.Xr zpool-scrub 8
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