man/man8/zfs.8

.\"
.\" 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
.\" and limitations under the License.
.\"
.\" 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]
.\"
.\" CDDL HEADER END
.\"
.\" 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.
.\" Copyright (c) 2011, Pawel Jakub Dawidek <pjd@FreeBSD.org>
.\" Copyright (c) 2012, Glen Barber <gjb@FreeBSD.org>
.\" Copyright (c) 2012, Bryan Drewery <bdrewery@FreeBSD.org>
.\" Copyright (c) 2013, Steven Hartland <smh@FreeBSD.org>
.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
.\" Copyright (c) 2014 by Adam Stevko. All rights reserved.
.\" Copyright (c) 2014 Integros [integros.com]
.\" Copyright (c) 2014, Xin LI <delphij@FreeBSD.org>
.\" Copyright (c) 2014-2015, The FreeBSD Foundation, All Rights Reserved.
.\" Copyright (c) 2016 Nexenta Systems, Inc. All Rights Reserved.
.\" Copyright 2019 Richard Laager. All rights reserved.
.\" Copyright 2018 Nexenta Systems, Inc.
.\" Copyright 2019 Joyent, Inc.
.\"
.Dd March 16, 2022
.Dt ZFS 8
.Os
.
.Sh NAME
.Nm zfs
.Nd configure ZFS datasets
.Sh SYNOPSIS
.Nm
.Fl ?V
.Nm
.Cm version
.Nm
.Cm subcommand
.Op Ar arguments
.
.Sh DESCRIPTION
The
.Nm
command configures ZFS datasets within a ZFS storage pool, as described in
.Xr zpool 8 .
A dataset is identified by a unique path within the ZFS namespace.
For example:
.Dl pool/{filesystem,volume,snapshot}
.Pp
where the maximum length of a dataset name is
.Sy MAXNAMELEN Pq 256B
and the maximum amount of nesting allowed in a path is 50 levels deep.
.Pp
A dataset can be one of the following:
.Bl -tag -offset Ds -width "file system"
.It Sy file system
Can be mounted within the standard system namespace and behaves like other file
systems.
While ZFS file systems are designed to be POSIX-compliant, known issues exist
that prevent compliance in some cases.
Applications that depend on standards conformance might fail due to non-standard
behavior when checking file system free space.
.It Sy volume
A logical volume exported as a raw or block device.
This type of dataset should only be used when a block device is required.
File systems are typically used in most environments.
.It Sy snapshot
A read-only version of a file system or volume at a given point in time.
It is specified as
.Ar filesystem Ns @ Ns Ar name
or
.Ar volume Ns @ Ns Ar name .
.It Sy bookmark
Much like a
.Sy snapshot ,
but without the hold on on-disk data.
It can be used as the source of a send (but not for a receive).
It is specified as
.Ar filesystem Ns # Ns Ar name
or
.Ar volume Ns # Ns Ar name .
.El
.Pp
See
.Xr zfsconcepts 7
for details.
.
.Ss Properties
Properties are divided into two types: native properties and user-defined
.Pq or Qq user
properties.
Native properties either export internal statistics or control ZFS behavior.
In addition, native properties are either editable or read-only.
User properties have no effect on ZFS behavior, but you can use them to annotate
datasets in a way that is meaningful in your environment.
For more information about properties, see
.Xr zfsprops 7 .
.
.Ss Encryption
Enabling the
.Sy encryption
feature allows for the creation of encrypted filesystems and volumes.
ZFS will encrypt file and zvol data, file attributes, ACLs, permission bits,
directory listings, FUID mappings, and
.Sy userused Ns / Ns Sy groupused Ns / Ns Sy projectused
data.
For an overview of encryption, see
.Xr zfs-load-key 8 .
.
.Sh SUBCOMMANDS
All subcommands that modify state are logged persistently to the pool in their
original form.
.Bl -tag -width ""
.It Nm Fl ?
Displays a help message.
.It Xo
.Nm
.Fl V , -version
.Xc
.It Xo
.Nm
.Cm version
.Xc
Displays the software version of the
.Nm
userland utility and the zfs kernel module.
.El
.
.Ss Dataset Management
.Bl -tag -width ""
.It Xr zfs-list 8
Lists the property information for the given datasets in tabular form.
.It Xr zfs-create 8
Creates a new ZFS file system or volume.
.It Xr zfs-destroy 8
Destroys the given dataset(s), snapshot(s), or bookmark.
.It Xr zfs-rename 8
Renames the given dataset (filesystem or snapshot).
.It Xr zfs-upgrade 8
Manage upgrading the on-disk version of filesystems.
.El
.
.Ss Snapshots
.Bl -tag -width ""
.It Xr zfs-snapshot 8
Creates snapshots with the given names.
.It Xr zfs-rollback 8
Roll back the given dataset to a previous snapshot.
.It Xr zfs-hold 8 Ns / Ns Xr zfs-release 8
Add or remove a hold reference to the specified snapshot or snapshots.
If a hold exists on a snapshot, attempts to destroy that snapshot by using the
.Nm zfs Cm destroy
command return
.Sy EBUSY .
.It Xr zfs-diff 8
Display the difference between a snapshot of a given filesystem and another
snapshot of that filesystem from a later time or the current contents of the
filesystem.
.El
.
.Ss Clones
.Bl -tag -width ""
.It Xr zfs-clone 8
Creates a clone of the given snapshot.
.It Xr zfs-promote 8
Promotes a clone file system to no longer be dependent on its
.Qq origin
snapshot.
.El
.
.Ss Send & Receive
.Bl -tag -width ""
.It Xr zfs-send 8
Generate a send stream, which may be of a filesystem, and may be incremental
from a bookmark.
.It Xr zfs-receive 8
Creates a snapshot whose contents are as specified in the stream provided on
standard input.
If a full stream is received, then a new file system is created as well.
Streams are created using the
.Xr zfs-send 8
subcommand, which by default creates a full stream.
.It Xr zfs-bookmark 8
Creates a new bookmark of the given snapshot or bookmark.
Bookmarks mark the point in time when the snapshot was created, and can be used
as the incremental source for a
.Nm zfs Cm send
command.
.It Xr zfs-redact 8
Generate a new redaction bookmark.
This feature can be used to allow clones of a filesystem to be made available on
a remote system, in the case where their parent need not (or needs to not) be
usable.
.El
.
.Ss Properties
.Bl -tag -width ""
.It Xr zfs-get 8
Displays properties for the given datasets.
.It Xr zfs-set 8
Sets the property or list of properties to the given value(s) for each dataset.
.It Xr zfs-inherit 8
Clears the specified property, causing it to be inherited from an ancestor,
restored to default if no ancestor has the property set, or with the
.Fl S
option reverted to the received value if one exists.
.El
.
.Ss Quotas
.Bl -tag -width ""
.It Xr zfs-userspace 8 Ns / Ns Xr zfs-groupspace 8 Ns / Ns Xr zfs-projectspace 8
Displays space consumed by, and quotas on, each user, group, or project
in the specified filesystem or snapshot.
.It Xr zfs-project 8
List, set, or clear project ID and/or inherit flag on the file(s) or directories.
.El
.
.Ss Mountpoints
.Bl -tag -width ""
.It Xr zfs-mount 8
Displays all ZFS file systems currently mounted, or mount ZFS filesystem
on a path described by its
.Sy mountpoint
property.
.It Xr zfs-unmount 8
Unmounts currently mounted ZFS file systems.
.El
.
.Ss Shares
.Bl -tag -width ""
.It Xr zfs-share 8
Shares available ZFS file systems.
.It Xr zfs-unshare 8
Unshares currently shared ZFS file systems.
.El
.
.Ss Delegated Administration
.Bl -tag -width ""
.It Xr zfs-allow 8
Delegate permissions on the specified filesystem or volume.
.It Xr zfs-unallow 8
Remove delegated permissions on the specified filesystem or volume.
.El
.
.Ss Encryption
.Bl -tag -width ""
.It Xr zfs-change-key 8
Add or change an encryption key on the specified dataset.
.It Xr zfs-load-key 8
Load the key for the specified encrypted dataset, enabling access.
.It Xr zfs-unload-key 8
Unload a key for the specified dataset, removing the ability to access the dataset.
.El
.
.Ss Channel Programs
.Bl -tag -width ""
.It Xr zfs-program 8
Execute ZFS administrative operations
programmatically via a Lua script-language channel program.
.El
.
.Ss Jails
.Bl -tag -width ""
.It Xr zfs-jail 8
Attaches a filesystem to a jail.
.It Xr zfs-unjail 8
Detaches a filesystem from a jail.
.El
.
.Ss Waiting
.Bl -tag -width ""
.It Xr zfs-wait 8
Wait for background activity in a filesystem to complete.
.El
.
.Sh EXIT STATUS
The
.Nm
utility exits
.Sy 0
on success,
.Sy 1
if an error occurs, and
.Sy 2
if invalid command line options were specified.
.
.Sh EXAMPLES
.\" Examples 1, 4, 6, 7, 11, 14, 16 are shared with zfs-set.8.
.\" Examples 1, 10 are shared with zfs-create.8.
.\" Examples 2, 3, 10, 15 are also shared with zfs-snapshot.8.
.\" Examples 3, 10, 15 are shared with zfs-destroy.8.
.\" Examples 5 are shared with zfs-list.8.
.\" Examples 8 are shared with zfs-rollback.8.
.\" Examples 9, 10 are shared with zfs-clone.8.
.\" Examples 10 are also shared with zfs-promote.8.
.\" Examples 10, 15 also are shared with zfs-rename.8.
.\" Examples 12, 13 are shared with zfs-send.8.
.\" Examples 12, 13 are also shared with zfs-receive.8.
.\" Examples 17, 18, 19, 20, 21 are shared with zfs-allow.8.
.\" Examples 22 are shared with zfs-diff.8.
.\" Examples 23 are shared with zfs-bookmark.8.
.\" Make sure to update them omnidirectionally
.Ss Example 1 : No Creating a ZFS File System Hierarchy
The following commands create a file system named
.Ar pool/home
and a file system named
.Ar pool/home/bob .
The mount point
.Pa /export/home
is set for the parent file system, and is automatically inherited by the child
file system.
.Dl # Nm zfs Cm create Ar pool/home
.Dl # Nm zfs Cm set Sy mountpoint Ns = Ns Ar /export/home pool/home
.Dl # Nm zfs Cm create Ar pool/home/bob
.
.Ss Example 2 : No Creating a ZFS Snapshot
The following command creates a snapshot named
.Ar yesterday .
This snapshot is mounted on demand in the
.Pa .zfs/snapshot
directory at the root of the
.Ar pool/home/bob
file system.
.Dl # Nm zfs Cm snapshot Ar pool/home/bob Ns @ Ns Ar yesterday
.
.Ss Example 3 : No Creating and Destroying Multiple Snapshots
The following command creates snapshots named
.Ar yesterday No of Ar pool/home
and all of its descendent file systems.
Each snapshot is mounted on demand in the
.Pa .zfs/snapshot
directory at the root of its file system.
The second command destroys the newly created snapshots.
.Dl # Nm zfs Cm snapshot Fl r Ar pool/home Ns @ Ns Ar yesterday
.Dl # Nm zfs Cm destroy Fl r Ar pool/home Ns @ Ns Ar yesterday
.
.Ss Example 4 : No Disabling and Enabling File System Compression
The following command disables the
.Sy compression
property for all file systems under
.Ar pool/home .
The next command explicitly enables
.Sy compression
for
.Ar pool/home/anne .
.Dl # Nm zfs Cm set Sy compression Ns = Ns Sy off Ar pool/home
.Dl # Nm zfs Cm set Sy compression Ns = Ns Sy on Ar pool/home/anne
.
.Ss Example 5 : No Listing ZFS Datasets
The following command lists all active file systems and volumes in the system.
Snapshots are displayed if
.Sy listsnaps Ns = Ns Sy on .
The default is
.Sy off .
See
.Xr zpoolprops 7
for more information on pool properties.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm list
NAME                      USED  AVAIL  REFER  MOUNTPOINT
pool                      450K   457G    18K  /pool
pool/home                 315K   457G    21K  /export/home
pool/home/anne             18K   457G    18K  /export/home/anne
pool/home/bob             276K   457G   276K  /export/home/bob
.Ed
.
.Ss Example 6 : No Setting a Quota on a ZFS File System
The following command sets a quota of 50 Gbytes for
.Ar pool/home/bob :
.Dl # Nm zfs Cm set Sy quota Ns = Ns Ar 50G pool/home/bob
.
.Ss Example 7 : No Listing ZFS Properties
The following command lists all properties for
.Ar pool/home/bob :
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm get Sy all Ar pool/home/bob
NAME           PROPERTY              VALUE                  SOURCE
pool/home/bob  type                  filesystem             -
pool/home/bob  creation              Tue Jul 21 15:53 2009  -
pool/home/bob  used                  21K                    -
pool/home/bob  available             20.0G                  -
pool/home/bob  referenced            21K                    -
pool/home/bob  compressratio         1.00x                  -
pool/home/bob  mounted               yes                    -
pool/home/bob  quota                 20G                    local
pool/home/bob  reservation           none                   default
pool/home/bob  recordsize            128K                   default
pool/home/bob  mountpoint            /pool/home/bob         default
pool/home/bob  sharenfs              off                    default
pool/home/bob  checksum              on                     default
pool/home/bob  compression           on                     local
pool/home/bob  atime                 on                     default
pool/home/bob  devices               on                     default
pool/home/bob  exec                  on                     default
pool/home/bob  setuid                on                     default
pool/home/bob  readonly              off                    default
pool/home/bob  zoned                 off                    default
pool/home/bob  snapdir               hidden                 default
pool/home/bob  acltype               off                    default
pool/home/bob  aclmode               discard                default
pool/home/bob  aclinherit            restricted             default
pool/home/bob  canmount              on                     default
pool/home/bob  xattr                 on                     default
pool/home/bob  copies                1                      default
pool/home/bob  version               4                      -
pool/home/bob  utf8only              off                    -
pool/home/bob  normalization         none                   -
pool/home/bob  casesensitivity       sensitive              -
pool/home/bob  vscan                 off                    default
pool/home/bob  nbmand                off                    default
pool/home/bob  sharesmb              off                    default
pool/home/bob  refquota              none                   default
pool/home/bob  refreservation        none                   default
pool/home/bob  primarycache          all                    default
pool/home/bob  secondarycache        all                    default
pool/home/bob  usedbysnapshots       0                      -
pool/home/bob  usedbydataset         21K                    -
pool/home/bob  usedbychildren        0                      -
pool/home/bob  usedbyrefreservation  0                      -
.Ed
.Pp
The following command gets a single property value:
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm get Fl H o Sy value compression Ar pool/home/bob
on
.Ed
.Pp
The following command lists all properties with local settings for
.Ar pool/home/bob :
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm get Fl r s Sy local Fl o Sy name , Ns Sy property , Ns Sy value all Ar pool/home/bob
NAME           PROPERTY              VALUE
pool/home/bob  quota                 20G
pool/home/bob  compression           on
.Ed
.
.Ss Example 8 : No Rolling Back a ZFS File System
The following command reverts the contents of
.Ar pool/home/anne
to the snapshot named
.Ar yesterday ,
deleting all intermediate snapshots:
.Dl # Nm zfs Cm rollback Fl r Ar pool/home/anne Ns @ Ns Ar yesterday
.
.Ss Example 9 : No Creating a ZFS Clone
The following command creates a writable file system whose initial contents are
the same as
.Ar pool/home/bob@yesterday .
.Dl # Nm zfs Cm clone Ar pool/home/bob@yesterday pool/clone
.
.Ss Example 10 : No Promoting a ZFS Clone
The following commands illustrate how to test out changes to a file system, and
then replace the original file system with the changed one, using clones, clone
promotion, and renaming:
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm create Ar pool/project/production
  populate /pool/project/production with data
.No # Nm zfs Cm snapshot Ar pool/project/production Ns @ Ns Ar today
.No # Nm zfs Cm clone Ar pool/project/production@today pool/project/beta
  make changes to /pool/project/beta and test them
.No # Nm zfs Cm promote Ar pool/project/beta
.No # Nm zfs Cm rename Ar pool/project/production pool/project/legacy
.No # Nm zfs Cm rename Ar pool/project/beta pool/project/production
  once the legacy version is no longer needed, it can be destroyed
.No # Nm zfs Cm destroy Ar pool/project/legacy
.Ed
.
.Ss Example 11 : No Inheriting ZFS Properties
The following command causes
.Ar pool/home/bob No and Ar pool/home/anne
to inherit the
.Sy checksum
property from their parent.
.Dl # Nm zfs Cm inherit Sy checksum Ar pool/home/bob pool/home/anne
.
.Ss Example 12 : No Remotely Replicating ZFS Data
The following commands send a full stream and then an incremental stream to a
remote machine, restoring them into
.Em poolB/received/fs@a
and
.Em poolB/received/fs@b ,
respectively.
.Em poolB
must contain the file system
.Em poolB/received ,
and must not initially contain
.Em poolB/received/fs .
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm send Ar pool/fs@a |
.No "   " Nm ssh Ar host Nm zfs Cm receive Ar poolB/received/fs Ns @ Ns Ar a
.No # Nm zfs Cm send Fl i Ar a pool/fs@b |
.No "   " Nm ssh Ar host Nm zfs Cm receive Ar poolB/received/fs
.Ed
.
.Ss Example 13 : No Using the Nm zfs Cm receive Fl d No Option
The following command sends a full stream of
.Ar poolA/fsA/fsB@snap
to a remote machine, receiving it into
.Ar poolB/received/fsA/fsB@snap .
The
.Ar fsA/fsB@snap
portion of the received snapshot's name is determined from the name of the sent
snapshot.
.Ar poolB
must contain the file system
.Ar poolB/received .
If
.Ar poolB/received/fsA
does not exist, it is created as an empty file system.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm send Ar poolA/fsA/fsB@snap |
.No "   " Nm ssh Ar host Nm zfs Cm receive Fl d Ar poolB/received
.Ed
.
.Ss Example 14 : No Setting User Properties
The following example sets the user-defined
.Ar com.example : Ns Ar department
property for a dataset:
.Dl # Nm zfs Cm set Ar com.example : Ns Ar department Ns = Ns Ar 12345 tank/accounting
.
.Ss Example 15 : No Performing a Rolling Snapshot
The following example shows how to maintain a history of snapshots with a
consistent naming scheme.
To keep a week's worth of snapshots, the user destroys the oldest snapshot,
renames the remaining snapshots, and then creates a new snapshot, as follows:
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm destroy Fl r Ar pool/users@7daysago
.No # Nm zfs Cm rename Fl r Ar pool/users@6daysago No @ Ns Ar 7daysago
.No # Nm zfs Cm rename Fl r Ar pool/users@5daysago No @ Ns Ar 6daysago
.No # Nm zfs Cm rename Fl r Ar pool/users@4daysago No @ Ns Ar 5daysago
.No # Nm zfs Cm rename Fl r Ar pool/users@3daysago No @ Ns Ar 4daysago
.No # Nm zfs Cm rename Fl r Ar pool/users@2daysago No @ Ns Ar 3daysago
.No # Nm zfs Cm rename Fl r Ar pool/users@yesterday No @ Ns Ar 2daysago
.No # Nm zfs Cm rename Fl r Ar pool/users@today No @ Ns Ar yesterday
.No # Nm zfs Cm snapshot Fl r Ar pool/users Ns @ Ns Ar today
.Ed
.
.Ss Example 16 : No Setting sharenfs Property Options on a ZFS File System
The following commands show how to set
.Sy sharenfs
property options to enable read-write
access for a set of IP addresses and to enable root access for system
.Qq neo
on the
.Ar tank/home
file system:
.Dl # Nm zfs Cm set Sy sharenfs Ns = Ns ' Ns Ar rw Ns =@123.123.0.0/16:[::1],root= Ns Ar neo Ns ' tank/home
.Pp
If you are using DNS for host name resolution,
specify the fully-qualified hostname.
.
.Ss Example 17 : No Delegating ZFS Administration Permissions on a ZFS Dataset
The following example shows how to set permissions so that user
.Ar cindys
can create, destroy, mount, and take snapshots on
.Ar tank/cindys .
The permissions on
.Ar tank/cindys
are also displayed.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm allow Sy cindys create , Ns Sy destroy , Ns Sy mount , Ns Sy snapshot Ar tank/cindys
.No # Nm zfs Cm allow Ar tank/cindys
---- Permissions on tank/cindys --------------------------------------
Local+Descendent permissions:
        user cindys create,destroy,mount,snapshot
.Ed
.Pp
Because the
.Ar tank/cindys
mount point permission is set to 755 by default, user
.Ar cindys
will be unable to mount file systems under
.Ar tank/cindys .
Add an ACE similar to the following syntax to provide mount point access:
.Dl # Cm chmod No A+user: Ns Ar cindys Ns :add_subdirectory:allow Ar /tank/cindys
.
.Ss Example 18 : No Delegating Create Time Permissions on a ZFS Dataset
The following example shows how to grant anyone in the group
.Ar staff
to create file systems in
.Ar tank/users .
This syntax also allows staff members to destroy their own file systems, but not
destroy anyone else's file system.
The permissions on
.Ar tank/users
are also displayed.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm allow Ar staff Sy create , Ns Sy mount Ar tank/users
.No # Nm zfs Cm allow Fl c Sy destroy Ar tank/users
.No # Nm zfs Cm allow Ar tank/users
---- Permissions on tank/users ---------------------------------------
Permission sets:
        destroy
Local+Descendent permissions:
        group staff create,mount
.Ed
.
.Ss Example 19 : No Defining and Granting a Permission Set on a ZFS Dataset
The following example shows how to define and grant a permission set on the
.Ar tank/users
file system.
The permissions on
.Ar tank/users
are also displayed.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm allow Fl s No @ Ns Ar pset Sy create , Ns Sy destroy , Ns Sy snapshot , Ns Sy mount Ar tank/users
.No # Nm zfs Cm allow staff No @ Ns Ar pset tank/users
.No # Nm zfs Cm allow Ar tank/users
---- Permissions on tank/users ---------------------------------------
Permission sets:
        @pset create,destroy,mount,snapshot
Local+Descendent permissions:
        group staff @pset
.Ed
.
.Ss Example 20 : No Delegating Property Permissions on a ZFS Dataset
The following example shows to grant the ability to set quotas and reservations
on the
.Ar users/home
file system.
The permissions on
.Ar users/home
are also displayed.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm allow Ar cindys Sy quota , Ns Sy reservation Ar users/home
.No # Nm zfs Cm allow Ar users/home
---- Permissions on users/home ---------------------------------------
Local+Descendent permissions:
        user cindys quota,reservation
cindys% zfs set quota=10G users/home/marks
cindys% zfs get quota users/home/marks
NAME              PROPERTY  VALUE  SOURCE
users/home/marks  quota     10G    local
.Ed
.
.Ss Example 21 : No Removing ZFS Delegated Permissions on a ZFS Dataset
The following example shows how to remove the snapshot permission from the
.Ar staff
group on the
.Sy tank/users
file system.
The permissions on
.Sy tank/users
are also displayed.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm unallow Ar staff Sy snapshot Ar tank/users
.No # Nm zfs Cm allow Ar tank/users
---- Permissions on tank/users ---------------------------------------
Permission sets:
        @pset create,destroy,mount,snapshot
Local+Descendent permissions:
        group staff @pset
.Ed
.
.Ss Example 22 : No Showing the differences between a snapshot and a ZFS Dataset
The following example shows how to see what has changed between a prior
snapshot of a ZFS dataset and its current state.
The
.Fl F
option is used to indicate type information for the files affected.
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm diff Fl F Ar tank/test@before tank/test
M       /       /tank/test/
M       F       /tank/test/linked      (+1)
R       F       /tank/test/oldname -> /tank/test/newname
-       F       /tank/test/deleted
+       F       /tank/test/created
M       F       /tank/test/modified
.Ed
.
.Ss Example 23 : No Creating a bookmark
The following example create a bookmark to a snapshot.
This bookmark can then be used instead of snapshot in send streams.
.Dl # Nm zfs Cm bookmark Ar rpool Ns @ Ns Ar snapshot rpool Ns # Ns Ar bookmark
.
.Ss Example 24 : No Setting Sy sharesmb No Property Options on a ZFS File System
The following example show how to share SMB filesystem through ZFS.
Note that a user and their password must be given.
.Dl # Nm smbmount Ar //127.0.0.1/share_tmp /mnt/tmp Fl o No user=workgroup/turbo,password=obrut,uid=1000
.Pp
Minimal
.Pa /etc/samba/smb.conf
configuration is required, as follows.
.Pp
Samba will need to bind to the loopback interface for the ZFS utilities to
communicate with Samba.
This is the default behavior for most Linux distributions.
.Pp
Samba must be able to authenticate a user.
This can be done in a number of ways
.Pq Xr passwd 5 , LDAP , Xr smbpasswd 5 , &c.\& .
How to do this is outside the scope of this document – refer to
.Xr smb.conf 5
for more information.
.Pp
See the
.Sx USERSHARES
section for all configuration options,
in case you need to modify any options of the share afterwards.
Do note that any changes done with the
.Xr net 8
command will be undone if the share is ever unshared (like via a reboot).
.
.Sh ENVIRONMENT VARIABLES
.Bl -tag -width "ZFS_MOUNT_HELPER"
.It Sy ZFS_MOUNT_HELPER
Cause
.Nm zfs Cm mount
to use
.Xr mount 8
to mount ZFS datasets.
This option is provided for backwards compatibility with older ZFS versions.
.El
.
.Sh INTERFACE STABILITY
.Sy Committed .
.
.Sh SEE ALSO
.Xr attr 1 ,
.Xr gzip 1 ,
.Xr ssh 1 ,
.Xr chmod 2 ,
.Xr fsync 2 ,
.Xr stat 2 ,
.Xr write 2 ,
.Xr acl 5 ,
.Xr attributes 5 ,
.Xr exports 5 ,
.Xr zfsconcepts 7 ,
.Xr zfsprops 7 ,
.Xr exportfs 8 ,
.Xr mount 8 ,
.Xr net 8 ,
.Xr selinux 8 ,
.Xr zfs-allow 8 ,
.Xr zfs-bookmark 8 ,
.Xr zfs-change-key 8 ,
.Xr zfs-clone 8 ,
.Xr zfs-create 8 ,
.Xr zfs-destroy 8 ,
.Xr zfs-diff 8 ,
.Xr zfs-get 8 ,
.Xr zfs-groupspace 8 ,
.Xr zfs-hold 8 ,
.Xr zfs-inherit 8 ,
.Xr zfs-jail 8 ,
.Xr zfs-list 8 ,
.Xr zfs-load-key 8 ,
.Xr zfs-mount 8 ,
.Xr zfs-program 8 ,
.Xr zfs-project 8 ,
.Xr zfs-projectspace 8 ,
.Xr zfs-promote 8 ,
.Xr zfs-receive 8 ,
.Xr zfs-redact 8 ,
.Xr zfs-release 8 ,
.Xr zfs-rename 8 ,
.Xr zfs-rollback 8 ,
.Xr zfs-send 8 ,
.Xr zfs-set 8 ,
.Xr zfs-share 8 ,
.Xr zfs-snapshot 8 ,
.Xr zfs-unallow 8 ,
.Xr zfs-unjail 8 ,
.Xr zfs-unload-key 8 ,
.Xr zfs-unmount 8 ,
.Xr zfs-unshare 8 ,
.Xr zfs-upgrade 8 ,
.Xr zfs-userspace 8 ,
.Xr zfs-wait 8 ,
.Xr zpool 8