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a46001adb9
This commit expands on the zhack label repair command in d04b5c9 by
adding the -u option to undetach a device by regenerating uberblocks,
in addition to the existing functionality of fixing checksums, now
represented by -c. Previous behavior is retained in the case of no
options.
The changes are heavily inspired by Jeff Bonwick's labelfix
utility, as archived at:
https://gist.github.com/jjwhitney/baaa63144da89726e482
Additionally, it is now capable of properly determining the size of
block devices and other media, as well as handling sizes which are
not divisible by 2^18. This should make it viable for use on physical
devices and partitions, in addition to files.
These changes should make it possible to import zpools that have had
their uberblocks erased, such as in the case of pools rendered
inaccessible by erroneous detach commands.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: buzzingwires <buzzingwires@outlook.com>
Closes #14773
168 lines
3.4 KiB
Groff
168 lines
3.4 KiB
Groff
.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or https://opensource.org/licenses/CDDL-1.0.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
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.\"
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.\" lint-ok: WARNING: sections out of conventional order: Sh SYNOPSIS
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.\"
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.Dd May 26, 2021
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.Dt ZHACK 1
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.Os
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.
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.Sh NAME
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.Nm zhack
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.Nd libzpool debugging tool
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.Sh DESCRIPTION
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This utility pokes configuration changes directly into a ZFS pool,
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which is dangerous and can cause data corruption.
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.Sh SYNOPSIS
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.Bl -tag -width Ds
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.It Xo
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.Nm zhack
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.Cm feature stat
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.Ar pool
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.Xc
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List feature flags.
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.
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.It Xo
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.Nm zhack
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.Cm feature enable
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.Op Fl d Ar description
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.Op Fl r
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.Ar pool
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.Ar guid
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.Xc
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Add a new feature to
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.Ar pool
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that is uniquely identified by
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.Ar guid ,
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which is specified in the same form as a
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.Xr zfs 8
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user property.
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.Pp
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The
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.Ar description
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is a short human readable explanation of the new feature.
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.Pp
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The
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.Fl r
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flag indicates that
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.Ar pool
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can be safely opened in read-only mode by a system that does not understand the
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.Ar guid
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feature.
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.
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.It Xo
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.Nm zhack
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.Cm feature ref
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.Op Fl d Ns | Ns Fl m
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.Ar pool
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.Ar guid
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.Xc
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Increment the reference count of the
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.Ar guid
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feature in
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.Ar pool .
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.Pp
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The
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.Fl d
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flag decrements the reference count of the
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.Ar guid
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feature in
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.Ar pool
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instead.
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.Pp
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The
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.Fl m
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flag indicates that the
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.Ar guid
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feature is now required to read the pool MOS.
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.
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.It Xo
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.Nm zhack
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.Cm label repair
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.Op Fl cu
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.Ar device
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.Xc
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Repair labels of a specified
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.Ar device
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according to options.
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.Pp
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Flags may be combined to do their functions simultaneously.
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.
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.Pp
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The
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.Fl c
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flag repairs corrupted label checksums
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.
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.Pp
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The
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.Fl u
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flag restores the label on a detached device
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.Pp
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Example:
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.Nm zhack Cm label repair Fl cu Ar device
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Fix checksums and undetach a device
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.
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.El
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.
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.Sh GLOBAL OPTIONS
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The following can be passed to all
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.Nm
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invocations before any subcommand:
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.Bl -tag -width "-d dir"
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.It Fl c Ar cachefile
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Read
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.Ar pool
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configuration from the
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.Ar cachefile ,
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which is
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.Pa /etc/zfs/zpool.cache
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by default.
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.It Fl d Ar dir
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Search for
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.Ar pool
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members in
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.Ar dir .
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Can be specified more than once.
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.El
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.
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.Sh EXAMPLES
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.Bd -literal
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.No # Nm zhack Cm feature stat Ar tank
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for_read_obj:
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org.illumos:lz4_compress = 0
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for_write_obj:
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com.delphix:async_destroy = 0
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com.delphix:empty_bpobj = 0
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descriptions_obj:
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com.delphix:async_destroy = Destroy filesystems asynchronously.
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com.delphix:empty_bpobj = Snapshots use less space.
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org.illumos:lz4_compress = LZ4 compression algorithm support.
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.No # Nm zhack Cm feature enable Fl d No 'Predict future disk failures.' Ar tank com.example:clairvoyance
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.No # Nm zhack Cm feature ref Ar tank com.example:clairvoyance
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.Ed
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.
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.Sh SEE ALSO
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.Xr ztest 1 ,
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.Xr zpool-features 7 ,
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.Xr zfs 8
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