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.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
.\" Copyright (c) 2011, 2019 by Delphix. All rights reserved.
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.Dd June 30, 2019
.Dt ZFS-HOLD 8
.Os OpenZFS
.
.Sh NAME
.Nm zfs-hold
.Nd hold ZFS snapshots to prevent their removal
.Sh SYNOPSIS
.Nm zfs
.Cm hold
.Op Fl r
.Ar tag Ar snapshot Ns …
.Nm zfs
.Cm holds
.Op Fl rH
.Ar snapshot Ns …
.Nm zfs
.Cm release
.Op Fl r
.Ar tag Ar snapshot Ns …
.
.Sh DESCRIPTION
.Bl -tag -width ""
.It Xo
.Nm zfs
.Cm hold
.Op Fl r
.Ar tag Ar snapshot Ns …
.Xc
Adds a single reference, named with the
.Ar tag
argument, to the specified snapshots.
Each snapshot has its own tag namespace, and tags must be unique within that
space.
.Pp
If a hold exists on a snapshot, attempts to destroy that snapshot by using the
.Nm zfs Cm destroy
command return
.Sy EBUSY .
.Bl -tag -width "-r"
.It Fl r
Specifies that a hold with the given tag is applied recursively to the snapshots
of all descendent file systems.
.El
.It Xo
.Nm zfs
.Cm holds
.Op Fl rH
.Ar snapshot Ns …
.Xc
Lists all existing user references for the given snapshot or snapshots.
.Bl -tag -width "-r"
.It Fl r
Lists the holds that are set on the named descendent snapshots, in addition to
listing the holds on the named snapshot.
.It Fl H
Do not print headers, use tab-delimited output.
.El
.It Xo
.Nm zfs
.Cm release
.Op Fl r
.Ar tag Ar snapshot Ns …
.Xc
Removes a single reference, named with the
.Ar tag
argument, from the specified snapshot or snapshots.
The tag must already exist for each snapshot.
If a hold exists on a snapshot, attempts to destroy that snapshot by using the
.Nm zfs Cm destroy
command return
.Sy EBUSY .
.Bl -tag -width "-r"
.It Fl r
Recursively releases a hold with the given tag on the snapshots of all
descendent file systems.
.El
.El
.
.Sh SEE ALSO
.Xr zfs-destroy 8