A ZFS dataset of type filesystem 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 nonstandard behavior when checking file system free space.

A logical volume exported as a raw or block device. This type of dataset should only be used under special circumstances. File systems are typically used in most environments.

A read-only version of a file system or volume at a given point in time. It is specified as filesystem@name or volume@name.

The amount of space available to the dataset and all its children, assuming that there is no other activity in the pool. Because space is shared within a pool, availability can be limited by any number of factors, including physical pool size, quotas, reservations, or other datasets within the pool. This property can also be referred to by its shortened column name, avail.

For non-snapshots, the compression ratio achieved for the used space of this dataset, expressed as a multiplier. The used property includes descendant datasets, and, for clones, does not include the space shared with the origin snapshot. For snapshots, the compressratio is the same as the refcompressratio property. Compression can be turned on by running: zfs set compression=on dataset. The default value is off.

The time this dataset was created.

For snapshots, this property is a comma-separated list of filesystems or volumes which are clones of this snapshot. The clones' origin property is this snapshot. If the clones property is not empty, then this snapshot can not be destroyed (even with the -r or -f options).

This property is on if the snapshot has been marked for deferred destroy by using the zfs destroy -d command. Otherwise, the property is off.

For file systems, indicates whether the file system is currently mounted. This property can be either yes or no.

For cloned file systems or volumes, the snapshot from which the clone was created. See also the clones property.

The amount of data that is accessible by this dataset, which may or may not be shared with other datasets in the pool. When a snapshot or clone is created, it initially references the same amount of space as the file system or snapshot it was created from, since its contents are identical. This property can also be referred to by its shortened column name, refer.

The compression ratio achieved for the referenced space of this dataset, expressed as a multiplier. See also the compressratio property.

The type of dataset: filesystem, volume, or snapshot.

The amount of space consumed by this dataset and all its descendents. This is the value that is checked against this dataset's quota and reservation. The space used does not include this dataset's reservation, but does take into account the reservations of any descendent datasets. The amount of space that a dataset consumes from its parent, as well as the amount of space that are freed if this dataset is recursively destroyed, is the greater of its space used and its reservation. When snapshots (see the "Snapshots" section) are created, their space is initially shared between the snapshot and the file system, and possibly with previous snapshots. As the file system changes, space that was previously shared becomes unique to the snapshot, and counted in the snapshot's space used. Additionally, deleting snapshots can increase the amount of space unique to (and used by) other snapshots. The amount of space used, available, or referenced does not take into account pending changes. Pending changes are generally accounted for within a few seconds. Committing a change to a disk using fsync(3c) or O_SYNC does not necessarily guarantee that the space usage information is updated immediately.

The usedby* properties decompose the used properties into the various reasons that space is used. Specifically, used = usedbychildren + usedbydataset + usedbyrefreservation +, usedbysnapshots. These properties are only available for datasets created on zpool "version 13" pools.

The amount of space used by children of this dataset, which would be freed if all the dataset's children were destroyed.

The amount of space used by this dataset itself, which would be freed if the dataset were destroyed (after first removing any refreservation and destroying any necessary snapshots or descendents).

The amount of space used by a refreservation set on this dataset, which would be freed if the refreservation was removed.

The amount of space consumed by snapshots of this dataset. In particular, it is the amount of space that would be freed if all of this dataset's snapshots were destroyed. Note that this is not simply the sum of the snapshots' used properties because space can be shared by multiple snapshots.

The amount of space consumed by the specified user in this dataset. Space is charged to the owner of each file, as displayed by ls -l. The amount of space charged is displayed by du and ls -s. See the zfs userspace subcommand for more information. Unprivileged users can access only their own space usage. The root user, or a user who has been granted the userused privilege with zfs allow, can access everyone's usage. The userused@... properties are not displayed by zfs get all. The user's name must be appended after the @ symbol, using one of the following forms:

This property is set to the number of user holds on this snapshot. User holds are set by using the zfs hold command.

The amount of space consumed by the specified group in this dataset. Space is charged to the group of each file, as displayed by ls -l. See the userused@user property for more information. Unprivileged users can only access their own groups' space usage. The root user, or a user who has been granted the groupused privilege with zfs allow, can access all groups' usage.

For volumes, specifies the block size of the volume. The blocksize cannot be changed once the volume has been written, so it should be set at volume creation time. The default blocksize for volumes is 8 Kbytes. Any power of 2 from 512 bytes to 128 Kbytes is valid. This property can also be referred to by its shortened column name, volblock.

The amount of referenced space written to this dataset since the previous snapshot.

The amount of referenced space written to this dataset since the specified snapshot. This is the space that is referenced by this dataset but was not referenced by the specified snapshot. The snapshot may be specified as a short snapshot name (just the part after the @), in which case it will be interpreted as a snapshot in the same filesystem as this dataset. The snapshot be a full snapshot name (filesystem@snapshot), which for clones may be a snapshot in the origin's filesystem (or the origin of the origin's filesystem, etc).

Controls how ACL entries are inherited when files and directories are created. A file system with an aclinherit property of discard does not inherit any ACL entries. A file system with an aclinherit property value of noallow only inherits inheritable ACL entries that specify "deny" permissions. The property value restricted (the default) removes the write_acl and write_owner permissions when the ACL entry is inherited. A file system with an aclinherit property value of passthrough inherits all inheritable ACL entries without any modifications made to the ACL entries when they are inherited. A file system with an aclinherit property value of passthrough-x has the same meaning as passthrough, except that the owner@, group@, and everyone@ ACEs inherit the execute permission only if the file creation mode also requests the execute bit. When the property value is set to passthrough, files are created with a mode determined by the inheritable ACEs. If no inheritable ACEs exist that affect the mode, then the mode is set in accordance to the requested mode from the application.

Controls how an ACL is modified during chmod(2). A file system with an aclmode property of discard (the default) deletes all ACL entries that do not represent the mode of the file. An aclmode property of groupmask reduces permissions granted in all ALLOW entries found in the ACL such that they are no greater than the group permissions specified by chmod. A file system with an aclmode property of passthrough indicates that no changes are made to the ACL other than creating or updating the necessary ACL entries to represent the new mode of the file or directory.

Controls whether the access time for files is updated when they are read. Turning this property off avoids producing write traffic when reading files and can result in significant performance gains, though it might confuse mailers and other similar utilities. The default value is on.

If this property is set to off, the file system cannot be mounted, and is ignored by zfs mount -a. Setting this property to off is similar to setting the mountpoint property to none, except that the dataset still has a normal mountpoint property, which can be inherited. Setting this property to off allows datasets to be used solely as a mechanism to inherit properties. One example of setting canmount=off is to have two datasets with the same mountpoint, so that the children of both datasets appear in the same directory, but might have different inherited characteristics. When the noauto option is set, a dataset can only be mounted and unmounted explicitly. The dataset is not mounted automatically when the dataset is created or imported, nor is it mounted by the zfs mount -a command or unmounted by the zfs unmount -a command. This property is not inherited.

Controls the checksum used to verify data integrity. The default value is on, which automatically selects an appropriate algorithm (currently, fletcher2, but this may change in future releases). The value off disables integrity checking on user data. Disabling checksums is NOT a recommended practice. Changing this property affects only newly-written data.

Controls the compression algorithm used for this dataset. The lzjb compression algorithm is optimized for performance while providing decent data compression. Setting compression to on uses the lzjb compression algorithm. The gzip compression algorithm uses the same compression as the gzip(1) command. You can specify the gzip level by using the value gzip-N where N is an integer from 1 (fastest) to 9 (best compression ratio). Currently, gzip is equivalent to gzip-6 (which is also the default for gzip(1)). The zle compression algorithm compresses runs of zeros. This property can also be referred to by its shortened column name compress. Changing this property affects only newly-written data.

Controls the number of copies of data stored for this dataset. These copies are in addition to any redundancy provided by the pool, for example, mirroring or RAID-Z. The copies are stored on different disks, if possible. The space used by multiple copies is charged to the associated file and dataset, changing the used property and counting against quotas and reservations. Changing this property only affects newly-written data. Therefore, set this property at file system creation time by using the -o copies=N option.

Controls whether device nodes can be opened on this file system. The default value is on.

Controls whether processes can be executed from within this file system. The default value is on.

Controls the mount point used for this file system. See the "Mount Points" section for more information on how this property is used. When the mountpoint property is changed for a file system, the file system and any children that inherit the mount point are unmounted. If the new value is legacy, then they remain unmounted. Otherwise, they are automatically remounted in the new location if the property was previously legacy or none, or if they were mounted before the property was changed. In addition, any shared file systems are unshared and shared in the new location.

Controls whether the file system should be mounted with nbmand (Non Blocking mandatory locks). This is used for CIFS clients. Changes to this property only take effect when the file system is umounted and remounted. See mount(1M) for more information on nbmand mounts.

Controls what is cached in the primary cache (ARC). If this property is set to all, then both user data and metadata is cached. If this property is set to none, then neither user data nor metadata is cached. If this property is set to metadata, then only metadata is cached. The default value is all.

Limits the amount of space a dataset and its descendents can consume. This property enforces a hard limit on the amount of space used. This includes all space consumed by descendents, including file systems and snapshots. Setting a quota on a descendent of a dataset that already has a quota does not override the ancestor's quota, but rather imposes an additional limit. Quotas cannot be set on volumes, as the volsize property acts as an implicit quota.

Limits the amount of space consumed by the specified user. User space consumption is identified by the userspace@user property. Enforcement of user quotas may be delayed by several seconds. This delay means that a user might exceed their quota before the system notices that they are over quota and begins to refuse additional writes with the EDQUOT error message . See the zfs userspace subcommand for more information. Unprivileged users can only access their own groups' space usage. The root user, or a user who has been granted the userquota privilege with zfs allow, can get and set everyone's quota. This property is not available on volumes, on file systems before version 4, or on pools before version 15. The userquota@... properties are not displayed by zfs get all. The user's name must be appended after the @ symbol, using one of the following forms:

Limits the amount of space consumed by the specified group. Group space consumption is identified by the userquota@user property. Unprivileged users can access only their own groups' space usage. The root user, or a user who has been granted the groupquota privilege with zfs allow, can get and set all groups' quotas.

Controls whether this dataset can be modified. The default value is off. This property can also be referred to by its shortened column name, rdonly.

Specifies a suggested block size for files in the file system. This property is designed solely for use with database workloads that access files in fixed-size records. ZFS automatically tunes block sizes according to internal algorithms optimized for typical access patterns. For databases that create very large files but access them in small random chunks, these algorithms may be suboptimal. Specifying a recordsize greater than or equal to the record size of the database can result in significant performance gains. Use of this property for general purpose file systems is strongly discouraged, and may adversely affect performance. The size specified must be a power of two greater than or equal to 512 and less than or equal to 128 Kbytes. Changing the file system's recordsize affects only files created afterward; existing files are unaffected. This property can also be referred to by its shortened column name, recsize.

Limits the amount of space a dataset can consume. This property enforces a hard limit on the amount of space used. This hard limit does not include space used by descendents, including file systems and snapshots.

The minimum amount of space guaranteed to a dataset, not including its descendents. When the amount of space used is below this value, the dataset is treated as if it were taking up the amount of space specified by refreservation. The refreservation reservation is accounted for in the parent datasets' space used, and counts against the parent datasets' quotas and reservations. If refreservation is set, a snapshot is only allowed if there is enough free pool space outside of this reservation to accommodate the current number of "referenced" bytes in the dataset. This property can also be referred to by its shortened column name, refreserv.

The minimum amount of space guaranteed to a dataset and its descendents. When the amount of space used is below this value, the dataset is treated as if it were taking up the amount of space specified by its reservation. Reservations are accounted for in the parent datasets' space used, and count against the parent datasets' quotas and reservations. This property can also be referred to by its shortened column name, reserv.

Controls what is cached in the secondary cache (L2ARC). If this property is set to all, then both user data and metadata is cached. If this property is set to none, then neither user data nor metadata is cached. If this property is set to metadata, then only metadata is cached. The default value is all.

Controls whether the set-UID bit is respected for the file system. The default value is on.

Like the sharenfs property, shareiscsi indicates whether a ZFS volume is exported as an iSCSI target. The acceptable values for this property are on, off, and type=disk. The default value is off. In the future, other target types might be supported. For example, tape. You might want to set shareiscsi=on for a file system so that all ZFS volumes within the file system are shared by default. However, setting this property on a file system has no direct effect.

Controls whether the file system is shared by using the Solaris CIFS service, and what options are to be used. A file system with the sharesmb property set to off is managed through traditional tools such as sharemgr(1M). Otherwise, the file system is automatically shared and unshared with the zfs share and zfs unshare commands. If the property is set to on, the sharemgr(1M) command is invoked with no options. Otherwise, the sharemgr(1M) command is invoked with options equivalent to the contents of this property. Because SMB shares requires a resource name, a unique resource name is constructed from the dataset name. The constructed name is a copy of the dataset name except that the characters in the dataset name, which would be illegal in the resource name, are replaced with underscore (_) characters. A pseudo property "name" is also supported that allows you to replace the data set name with a specified name. The specified name is then used to replace the prefix dataset in the case of inheritance. For example, if the dataset data/home/john is set to name=john, then data/home/john has a resource name of john. If a child dataset of data/home/john/backups, it has a resource name of john_backups. When SMB shares are created, the SMB share name appears as an entry in the .zfs/shares directory. You can use the ls or chmod command to display the share-level ACLs on the entries in this directory. When the sharesmb property is changed for a dataset, the dataset and any children inheriting the property are re-shared with the new options, only if the property was previously set to off, or if they were shared before the property was changed. If the new property is set to off, the file systems are unshared.

Controls whether the file system is shared via NFS, and what options are used. A file system with a sharenfs property of off is managed through traditional tools such as share(1M), unshare(1M), and dfstab(4). Otherwise, the file system is automatically shared and unshared with the zfs share and zfs unshare commands. If the property is set to on, the share(1M) command is invoked with no options. Otherwise, the share(1M) command is invoked with options equivalent to the contents of this property. When the sharenfs property is changed for a dataset, the dataset and any children inheriting the property are re-shared with the new options, only if the property was previously off, or if they were shared before the property was changed. If the new property is off, the file systems are unshared.

Provide a hint to ZFS about handling of synchronous requests in this dataset. If logbias is set to latency (the default), ZFS will use pool log devices (if configured) to handle the requests at low latency. If logbias is set to throughput, ZFS will not use configured pool log devices. ZFS will instead optimize synchronous operations for global pool throughput and efficient use of resources.

Controls whether the .zfs directory is hidden or visible in the root of the file system as discussed in the "Snapshots" section. The default value is hidden.

Controls the behavior of synchronous requests (e.g. fsync, O_DSYNC). default is the POSIX specified behavior of ensuring all synchronous requests are written to stable storage and all devices are flushed to ensure data is not cached by device controllers (this is the default). always causes every file system transaction to be written and flushed before its system call returns. This has a large performance penalty. disabled disables synchronous requests. File system transactions are only committed to stable storage periodically. This option will give the highest performance. However, it is very dangerous as ZFS would be ignoring the synchronous transaction demands of applications such as databases or NFS. Administrators should only use this option when the risks are understood.

The on-disk version of this file system, which is independent of the pool version. This property can only be set to later supported versions. See the zfs upgrade command.

For volumes, specifies the logical size of the volume. By default, creating a volume establishes a reservation of equal size. For storage pools with a version number of 9 or higher, a refreservation is set instead. Any changes to volsize are reflected in an equivalent change to the reservation (or refreservation). The volsize can only be set to a multiple of volblocksize, and cannot be zero. The reservation is kept equal to the volume's logical size to prevent unexpected behavior for consumers. Without the reservation, the volume could run out of space, resulting in undefined behavior or data corruption, depending on how the volume is used. These effects can also occur when the volume size is changed while it is in use (particularly when shrinking the size). Extreme care should be used when adjusting the volume size. Though not recommended, a "sparse volume" (also known as "thin provisioning") can be created by specifying the -s option to the zfs create -V command, or by changing the reservation after the volume has been created. A "sparse volume" is a volume where the reservation is less then the volume size. Consequently, writes to a sparse volume can fail with ENOSPC when the pool is low on space. For a sparse volume, changes to volsize are not reflected in the reservation.

Controls whether regular files should be scanned for viruses when a file is opened and closed. In addition to enabling this property, the virus scan service must also be enabled for virus scanning to occur. The default value is off.

Controls whether extended attributes are enabled for this file system. The default value is on.

Controls whether the dataset is managed from a non-global zone. See the "Zones" section for more information. The default value is off.

Indicates whether the file name matching algorithm used by the file system should be case-sensitive, case-insensitive, or allow a combination of both styles of matching. The default value for the casesensitivity property is sensitive. Traditionally, UNIX and POSIX file systems have case-sensitive file names. The mixed value for the casesensitivity property indicates that the file system can support requests for both case-sensitive and case-insensitive matching behavior. Currently, case-insensitive matching behavior on a file system that supports mixed behavior is limited to the Solaris CIFS server product. For more information about the mixed value behavior, see the Solaris ZFS Administration Guide.

Indicates whether the file system should perform a unicode normalization of file names whenever two file names are compared, and which normalization algorithm should be used. File names are always stored unmodified, names are normalized as part of any comparison process. If this property is set to a legal value other than none, and the utf8only property was left unspecified, the utf8only property is automatically set to on. The default value of the normalization property is none. This property cannot be changed after the file system is created.

Indicates whether the file system should reject file names that include characters that are not present in the UTF-8 character code set. If this property is explicitly set to off, the normalization property must either not be explicitly set or be set to none. The default value for the utf8only property is off. This property cannot be changed after the file system is created.

Displays a help message.

Creates a new ZFS file system. The file system is automatically mounted according to the mountpoint property inherited from the parent. -p

Creates a volume of the given size. The volume is exported as a block device in /dev/zvol/{dsk,rdsk}/path, where path is the name of the volume in the ZFS namespace. The size represents the logical size as exported by the device. By default, a reservation of equal size is created. size is automatically rounded up to the nearest 128 Kbytes to ensure that the volume has an integral number of blocks regardless of blocksize. -p

Destroys the given dataset. By default, the command unshares any file systems that are currently shared, unmounts any file systems that are currently mounted, and refuses to destroy a dataset that has active dependents (children or clones). -r

The given snapshots are destroyed immediately if and only if the zfs destroy command without the -d option would have destroyed it. Such immediate destruction would occur, for example, if the snapshot had no clones and the user-initiated reference count were zero. If a snapshot does not qualify for immediate destruction, it is marked for deferred deletion. In this state, it exists as a usable, visible snapshot until both of the preconditions listed above are met, at which point it is destroyed. An inclusive range of snapshots may be specified by separating the first and last snapshots with a percent sign. The first and/or last snapshots may be left blank, in which case the filesystem's oldest or newest snapshot will be implied. Multiple snapshots (or ranges of snapshots) of the same filesystem or volume may be specified in a comma-separated list of snapshots. Only the snapshot's short name (the part after the @) should be specified when using a range or comma-separated list to identify multiple snapshots. -d

Creates a snapshot with the given name. All previous modifications by successful system calls to the file system are part of the snapshot. See the "Snapshots" section for details. -r

Roll back the given dataset to a previous snapshot. When a dataset is rolled back, all data that has changed since the snapshot is discarded, and the dataset reverts to the state at the time of the snapshot. By default, the command refuses to roll back to a snapshot other than the most recent one. In order to do so, all intermediate snapshots must be destroyed by specifying the -r option. The -rR options do not recursively destroy the child snapshots of a recursive snapshot. Only the top-level recursive snapshot is destroyed by either of these options. To completely roll back a recursive snapshot, you must rollback the individual child snapshots. -r

Creates a clone of the given snapshot. See the "Clones" section for details. The target dataset can be located anywhere in the ZFS hierarchy, and is created as the same type as the original. -p

Promotes a clone file system to no longer be dependent on its "origin" snapshot. This makes it possible to destroy the file system that the clone was created from. The clone parent-child dependency relationship is reversed, so that the origin file system becomes a clone of the specified file system. The snapshot that was cloned, and any snapshots previous to this snapshot, are now owned by the promoted clone. The space they use moves from the origin file system to the promoted clone, so enough space must be available to accommodate these snapshots. No new space is consumed by this operation, but the space accounting is adjusted. The promoted clone must not have any conflicting snapshot names of its own. The rename subcommand can be used to rename any conflicting snapshots.

Renames the given dataset. The new target can be located anywhere in the ZFS hierarchy, with the exception of snapshots. Snapshots can only be renamed within the parent file system or volume. When renaming a snapshot, the parent file system of the snapshot does not need to be specified as part of the second argument. Renamed file systems can inherit new mount points, in which case they are unmounted and remounted at the new mount point. -p

Recursively rename the snapshots of all descendent datasets. Snapshots are the only dataset that can be renamed recursively.

Lists the property information for the given datasets in tabular form. If specified, you can list property information by the absolute pathname or the relative pathname. By default, all file systems and volumes are displayed. Snapshots are displayed if the listsnaps property is on (the default is off) . The following fields are displayed, name,used,available,referenced,mountpoint. -H

Sets the property to the given value for each dataset. Only some properties can be edited. See the "Properties" section for more information on what properties can be set and acceptable values. Numeric values can be specified as exact values, or in a human-readable form with a suffix of B, K, M, G, T, P, E, Z (for bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, exabytes, or zettabytes, respectively). User properties can be set on snapshots. For more information, see the "User Properties" section.

Displays properties for the given datasets. If no datasets are specified, then the command displays properties for all datasets on the system. For each property, the following columns are displayed:

 name Dataset name
 property Property name
 value Property value
 source Property source. Can either be local, default,
 temporary, inherited, or none (-).

Clears the specified property, causing it to be inherited from an ancestor. If no ancestor has the property set, then the default value is used. See the "Properties" section for a listing of default values, and details on which properties can be inherited. -r

Displays a list of file systems that are not the most recent version.

Upgrades file systems to a new on-disk version. Once this is done, the file systems will no longer be accessible on systems running older versions of the software. zfs send streams generated from new snapshots of these file systems cannot be accessed on systems running older versions of the software. In general, the file system version is independent of the pool version. See zpool(1M) for information on the zpool upgrade command. In some cases, the file system version and the pool version are interrelated and the pool version must be upgraded before the file system version can be upgraded. -a

Displays space consumed by, and quotas on, each user in the specified filesystem or snapshot. This corresponds to the userused@user and userquota@user properties. -n

Displays space consumed by, and quotas on, each group in the specified filesystem or snapshot. This subcommand is identical to zfs userspace, except that the default types to display are -t posixgroup,smbgroup.

-

Displays all ZFS file systems currently mounted.

Mounts ZFS file systems. Invoked automatically as part of the boot process. -o options

Unmounts currently mounted ZFS file systems. Invoked automatically as part of the shutdown process. -f

Shares available ZFS file systems. -a

Unshares currently shared ZFS file systems. This is invoked automatically as part of the shutdown process. -a

Creates a stream representation of the second snapshot, which is written to standard output. The output can be redirected to a file or to a different system (for example, using ssh(1). By default, a full stream is generated. -i snapshot

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 zfs send subcommand, which by default creates a full stream. zfs recv can be used as an alias for zfs receive. If an incremental stream is received, then the destination file system must already exist, and its most recent snapshot must match the incremental stream's source. For zvols, the destination device link is destroyed and recreated, which means the zvol cannot be accessed during the receive operation. When a snapshot replication package stream that is generated by using the zfs send -R command is received, any snapshots that do not exist on the sending location are destroyed by using the zfs destroy -d command. The name of the snapshot (and file system, if a full stream is received) that this subcommand creates depends on the argument type and the use of the -d or -e options. If the argument is a snapshot name, the specified snapshot is created. If the argument is a file system or volume name, a snapshot with the same name as the sent snapshot is created within the specified filesystem or volume. If neither of the -d or -e options are specified, the provided target snapshot name is used exactly as provided. The -d and -e options cause the file system name of the target snapshot to be determined by appending a portion of the sent snapshot's name to the specified target filesystem. If the -d option is specified, all but the first element of the sent snapshot's file system path (usually the pool name) is used and any required intermediate file systems within the specified one are created. If the -e option is specified, then only the last element of the sent snapshot's file system name (i.e. the name of the source file system itself) is used as the target file system name. -d

Displays permissions that have been delegated on the specified filesystem or volume. See the other forms of zfs allow for more information.

Delegates ZFS administration permission for the file systems to non-privileged users. [-ug] "everyone"|user|group[,...]

Sets "create time" permissions. These permissions are granted (locally) to the creator of any newly-created descendent file system.

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 an "at sign" (@), and can be no more than 64 characters long.

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

Removes permissions from a permission set. If no permissions are specified, then all permissions are removed, thus removing the set entirely.

Adds a single reference, named with the tag argument, to the specified snapshot or snapshots. Each snapshot has its own tag namespace, and tags must be unique within that space. If a hold exists on a snapshot, attempts to destroy that snapshot by using the zfs destroy command return EBUSY. -r

Lists all existing user references for the given snapshot or snapshots. -r

Removes a single reference, named with the 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 zfs destroy command return EBUSY. -r

Successful completion.

An error occurred.

Invalid command line options were specified.