Provided by: zfsutils-linux_2.2.2-0ubuntu9.3_amd64 
NAME
zfs-allow — delegate ZFS administration permissions to unprivileged users
SYNOPSIS
zfs allow [-dglu] user|group[,user|group]… perm|@setname[,perm|@setname]… filesystem|volume
zfs allow [-dl] -e|everyone perm|@setname[,perm|@setname]… filesystem|volume
zfs allow -c perm|@setname[,perm|@setname]… filesystem|volume
zfs allow -s @setname perm|@setname[,perm|@setname]… filesystem|volume
zfs unallow [-dglru] user|group[,user|group]… [perm|@setname[,perm|@setname]…] filesystem|volume
zfs unallow [-dlr] -e|everyone [perm|@setname[,perm|@setname]…] filesystem|volume
zfs unallow [-r] -c [perm|@setname[,perm|@setname]…] filesystem|volume
zfs unallow [-r] -s @setname [perm|@setname[,perm|@setname]…] filesystem|volume
DESCRIPTION
zfs allow filesystem|volume
Displays permissions that have been delegated on the specified filesystem or volume. See the other
forms of zfs allow for more information.
Delegations are supported under Linux with the exception of mount, unmount, mountpoint, canmount,
rename, and share. These permissions cannot be delegated because the Linux mount(8) command restricts
modifications of the global namespace to the root user.
zfs allow [-dglu] user|group[,user|group]… perm|@setname[,perm|@setname]… filesystem|volume
zfs allow [-dl] -e|everyone perm|@setname[,perm|@setname]… filesystem|volume
Delegates ZFS administration permission for the file systems to non-privileged users.
-d Allow only for the descendent file systems.
-e|everyone
Specifies that the permissions be delegated to everyone.
-g group[,group]…
Explicitly specify that permissions are delegated to the group.
-l Allow "locally" only for the specified file system.
-u user[,user]…
Explicitly specify that permissions are delegated to the user.
user|group[,user|group]…
Specifies to whom the permissions are delegated. Multiple entities can be specified as a comma-
separated list. If neither of the -gu options are specified, then the argument is interpreted
preferentially as the keyword everyone, then as a user name, and lastly as a group name. To
specify a user or group named "everyone", use the -g or -u options. To specify a group with the
same name as a user, use the -g options.
perm|@setname[,perm|@setname]…
The permissions to delegate. Multiple permissions may be specified as a comma-separated list.
Permission names are the same as ZFS subcommand and property names. See the property list below.
Property set names, which begin with @, may be specified. See the -s form below for details.
If neither of the -dl options are specified, or both are, then the permissions are allowed for the file
system or volume, and all of its descendents.
Permissions are generally the ability to use a ZFS subcommand or change a ZFS property. The following
permissions are available:
NAME TYPE NOTES
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
allow subcommand Must also have the permission that is being allowed
bookmark subcommand
clone subcommand Must also have the create ability and mount ability in the origin file system
create subcommand Must also have the mount ability. Must also have the refreservation ability to create a non-sparse volume.
destroy subcommand Must also have the mount ability
diff subcommand Allows lookup of paths within a dataset given an object number, and the ability to create snapshots necessary to zfs diff.
hold subcommand Allows adding a user hold to a snapshot
load-key subcommand Allows loading and unloading of encryption key (see zfs load-key and zfs unload-key).
change-key subcommand Allows changing an encryption key via zfs change-key.
mount subcommand Allows mounting/umounting ZFS datasets
promote subcommand Must also have the mount and promote ability in the origin file system
receive subcommand Must also have the mount and create ability
release subcommand Allows releasing a user hold which might destroy the snapshot
rename subcommand Must also have the mount and create ability in the new parent
rollback subcommand Must also have the mount ability
send subcommand
share subcommand Allows sharing file systems over NFS or SMB protocols
snapshot subcommand Must also have the mount ability
groupquota other Allows accessing any groupquota@… property
groupobjquota other Allows accessing any groupobjquota@… property
groupused other Allows reading any groupused@… property
groupobjused other Allows reading any groupobjused@… property
userprop other Allows changing any user property
userquota other Allows accessing any userquota@… property
userobjquota other Allows accessing any userobjquota@… property
userused other Allows reading any userused@… property
userobjused other Allows reading any userobjused@… property
projectobjquota other Allows accessing any projectobjquota@… property
projectquota other Allows accessing any projectquota@… property
projectobjused other Allows reading any projectobjused@… property
projectused other Allows reading any projectused@… property
aclinherit property
aclmode property
acltype property
atime property
canmount property
casesensitivity property
checksum property
compression property
context property
copies property
dedup property
defcontext property
devices property
dnodesize property
encryption property
exec property
filesystem_limit property
fscontext property
keyformat property
keylocation property
logbias property
mlslabel property
mountpoint property
nbmand property
normalization property
overlay property
pbkdf2iters property
primarycache property
quota property
readonly property
recordsize property
redundant_metadata property
refquota property
refreservation property
relatime property
reservation property
rootcontext property
secondarycache property
setuid property
sharenfs property
sharesmb property
snapdev property
snapdir property
snapshot_limit property
special_small_blocks property
sync property
utf8only property
version property
volblocksize property
volmode property
volsize property
vscan property
xattr property
zoned property
zfs allow -c perm|@setname[,perm|@setname]… filesystem|volume
Sets "create time" permissions. These permissions are granted (locally) to the creator of any newly-
created descendent file system.
zfs allow -s @setname perm|@setname[,perm|@setname]… filesystem|volume
Defines or adds permissions to a permission set. The set can be used by other zfs allow commands for
the specified file system and its descendents. Sets are evaluated dynamically, so changes to a set are
immediately reflected. Permission sets follow the same naming restrictions as ZFS file systems, but
the name must begin with @, and can be no more than 64 characters long.
zfs unallow [-dglru] user|group[,user|group]… [perm|@setname[,perm|@setname]…] filesystem|volume
zfs unallow [-dlr] -e|everyone [perm|@setname[,perm|@setname]…] filesystem|volume
zfs unallow [-r] -c [perm|@setname[,perm|@setname]…] filesystem|volume
Removes permissions that were granted with the zfs allow command. No permissions are explicitly
denied, so other permissions granted are still in effect. For example, if the permission is granted by
an ancestor. If no permissions are specified, then all permissions for the specified user, group, or
everyone are removed. Specifying everyone (or using the -e option) only removes the permissions that
were granted to everyone, not all permissions for every user and group. See the zfs allow command for
a description of the -ldugec options.
-r Recursively remove the permissions from this file system and all descendents.
zfs unallow [-r] -s @setname [perm|@setname[,perm|@setname]…] filesystem|volume
Removes permissions from a permission set. If no permissions are specified, then all permissions are
removed, thus removing the set entirely.
EXAMPLES
Example 1: Delegating ZFS Administration Permissions on a ZFS Dataset
The following example shows how to set permissions so that user cindys can create, destroy, mount, and
take snapshots on tank/cindys. The permissions on tank/cindys are also displayed.
# zfs allow cindys create,destroy,mount,snapshot tank/cindys
# zfs allow tank/cindys
---- Permissions on tank/cindys --------------------------------------
Local+Descendent permissions:
user cindys create,destroy,mount,snapshot
Because the tank/cindys mount point permission is set to 755 by default, user cindys will be unable to
mount file systems under tank/cindys. Add an ACE similar to the following syntax to provide mount point
access:
# chmod A+user:cindys:add_subdirectory:allow /tank/cindys
Example 2: Delegating Create Time Permissions on a ZFS Dataset
The following example shows how to grant anyone in the group staff to create file systems in 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 tank/users are also displayed.
# zfs allow staff create,mount tank/users
# zfs allow -c destroy tank/users
# zfs allow tank/users
---- Permissions on tank/users ---------------------------------------
Permission sets:
destroy
Local+Descendent permissions:
group staff create,mount
Example 3: Defining and Granting a Permission Set on a ZFS Dataset
The following example shows how to define and grant a permission set on the tank/users file system. The
permissions on tank/users are also displayed.
# zfs allow -s @pset create,destroy,snapshot,mount tank/users
# zfs allow staff @pset tank/users
# zfs allow tank/users
---- Permissions on tank/users ---------------------------------------
Permission sets:
@pset create,destroy,mount,snapshot
Local+Descendent permissions:
group staff @pset
Example 4: Delegating Property Permissions on a ZFS Dataset
The following example shows to grant the ability to set quotas and reservations on the users/home file
system. The permissions on users/home are also displayed.
# zfs allow cindys quota,reservation users/home
# zfs allow 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
Example 5: Removing ZFS Delegated Permissions on a ZFS Dataset
The following example shows how to remove the snapshot permission from the staff group on the tank/users
file system. The permissions on tank/users are also displayed.
# zfs unallow staff snapshot tank/users
# zfs allow tank/users
---- Permissions on tank/users ---------------------------------------
Permission sets:
@pset create,destroy,mount,snapshot
Local+Descendent permissions:
group staff @pset
OpenZFS March 16, 2022 ZFS-ALLOW(8)