zhack.1: modernise
The spacing on zhack feature stat pool is a bit iffy(?) Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12125
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Brian Behlendorf
parent
2c9c5bc859
commit
5aace42ce7
162
man/man1/zhack.1
162
man/man1/zhack.1
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@ -1,4 +1,3 @@
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'\" t
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.\"
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.\" CDDL HEADER START
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.\"
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@ -19,63 +18,108 @@
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.\"
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.\" CDDL HEADER END
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.\"
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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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.TH ZHACK 1 "Aug 24, 2020" OpenZFS
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.SH NAME
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zhack \- libzpool debugging tool
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.SH DESCRIPTION
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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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.LP
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.BI "zhack [\-c " "cachefile" "] [\-d " "dir" "] <" "subcommand" "> [" "arguments" "]"
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.SH OPTIONS
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.HP
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.BI "\-c" " cachefile"
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.IP
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Read the \fIpool\fR configuration from the \fIcachefile\fR, which is
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/etc/zfs/zpool.cache by default.
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.HP
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.BI "\-d" " dir"
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.IP
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Search for \fIpool\fR members in the \fIdir\fR path. Can be specified
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more than once.
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.SH SUBCOMMANDS
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.LP
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.BI "feature stat " "pool"
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.IP
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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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.LP
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.BI "feature enable [\-d " "description" "] [\-r] " "pool guid"
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.IP
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Add a new feature to \fIpool\fR that is uniquely identified by
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\fIguid\fR, which is specified in the same form as a zfs(8) user
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property.
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.IP
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The \fIdescription\fR is a short human readable explanation of the new
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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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.IP
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The \fB\-r\fR switch indicates that \fIpool\fR can be safely opened
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in read-only mode by a system that does not have the \fIguid\fR
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feature.
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.LP
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.BI "feature ref [\-d|\-m] " "pool guid"
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.IP
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Increment the reference count of the \fIguid\fR feature in \fIpool\fR.
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.IP
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The \fB\-d\fR switch decrements the reference count of the \fIguid\fR
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feature in \fIpool\fR.
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.IP
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The \fB\-m\fR switch indicates that the \fIguid\fR feature is now
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required to read the pool MOS.
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.SH EXAMPLES
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.LP
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.nf
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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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.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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# zhack feature stat 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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@ -85,14 +129,14 @@ 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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.LP
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# zhack feature enable -d 'Predict future disk failures.' \\
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tank com.example:clairvoyance
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.LP
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# zhack feature ref tank com.example:clairvoyance
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.SH AUTHORS
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This man page was written by Darik Horn <dajhorn@vanadac.com>.
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.SH SEE ALSO
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.BR zfs (8),
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.BR zpool-features (5),
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.BR ztest (1)
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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 5 ,
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.Xr zfs 8
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