The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/man/man8/fsck.zfs.8

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    1 .\"
    2 .\" CDDL HEADER START
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    5 .\" Common Development and Distribution License (the "License").
    6 .\" You may not use this file except in compliance with the License.
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   21 .\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
   22 .\"
   23 .Dd May 26, 2021
   24 .Dt FSCK.ZFS 8
   25 .Os
   26 .
   27 .Sh NAME
   28 .Nm fsck.zfs
   29 .Nd dummy ZFS filesystem checker
   30 .Sh SYNOPSIS
   31 .Nm
   32 .Op Ar options
   33 .Ar dataset Ns No …
   34 .
   35 .Sh DESCRIPTION
   36 .Nm
   37 is a thin shell wrapper that at most checks the status of a dataset's container
   38 pool.
   39 It is installed by OpenZFS because some Linux
   40 distributions expect a fsck helper for all filesystems.
   41 .Pp
   42 If more than one
   43 .Ar dataset
   44 is specified, each is checked in turn and the results binary-ored.
   45 .
   46 .Sh OPTIONS
   47 Ignored.
   48 .
   49 .Sh NOTES
   50 ZFS datasets are checked by running
   51 .Nm zpool Cm scrub
   52 on the containing pool.
   53 An individual ZFS dataset is never checked independently of its pool,
   54 which is unlike a regular filesystem.
   55 .Pp
   56 However, the
   57 .Xr fsck 8
   58 interface still allows it to communicate some errors: if the
   59 .Ar dataset
   60 is in a degraded pool, then
   61 .Nm
   62 will return exit code
   63 .Sy 4
   64 to indicate an uncorrected filesystem error.
   65 .Pp
   66 Similarly, if the
   67 .Ar dataset
   68 is in a faulted pool and has a legacy
   69 .Pa /etc/fstab
   70 record, then
   71 .Nm
   72 will return exit code
   73 .Sy 8
   74 to indicate a fatal operational error.
   75 .Sh SEE ALSO
   76 .Xr fstab 5 ,
   77 .Xr fsck 8 ,
   78 .Xr zpool-scrub 8

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