.sp
.LP
If needed, \fBZFS\fR file systems can also be managed with traditional tools (\fBmount\fR, \fBumount\fR, \fB/etc/fstab\fR). If a file system's mount point is set to \fBlegacy\fR, \fBZFS\fR makes no attempt to manage the file system, and the administrator is responsible for mounting and unmounting the file system.
+.SS "Deduplication"
+.sp
+.LP
+Deduplication is the process for removing redundant data at the block-level, reducing the total amount of data stored. If a file system has the \fBdedup\fR property enabled, duplicate data blocks are removed synchronously. The result is that only unique data is stored and common components are shared among files.
.SS "Native Properties"
.sp
.LP
.ne 2
.mk
.na
+\fB\fBdedup\fR=\fBon\fR | \fBoff\fR | \fBverify\fR | \fBsha256\fR[,\fBverify\fR]\fR
+.ad
+.sp .6
+.RS 4n
+Controls whether deduplication is in effect for a dataset. The default value is \fBoff\fR. The default checksum used for deduplication is \fBsha256\fR (subject to change). When \fBdedup\fR is enabled, the \fBdedup\fR checksum algorithm overrides the \fBchecksum\fR property. Setting the value to \fBverify\fR is equivalent to specifying \fBsha256,verify\fR.
+.sp
+If the property is set to \fBverify\fR, then, whenever two blocks have the same signature, ZFS will do a byte-for-byte comparison with the existing block to ensure that the contents are identical.
+.RE
+
+.sp
+.ne 2
+.mk
+.na
\fB\fBdevices\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.ne 2
.mk
.na
+\fB\fBmlslabel\fR=\fIlabel\fR | \fBnone\fR\fR
+.ad
+.sp .6
+.RS 4n
+The \fBmlslabel\fR property is a sensitivity label that determines if a dataset can be mounted in a zone on a system with Trusted Extensions enabled. If the labeled dataset matches the labeled zone, the dataset can be mounted and accessed from the labeled zone.
+.sp
+When the \fBmlslabel\fR property is not set, the default value is \fBnone\fR. Setting the \fBmlslabel\fR property to \fBnone\fR is equivalent to removing the property.
+.sp
+The \fBmlslabel\fR property can be modified only when Trusted Extensions is enabled and only with appropriate privilege. Rights to modify it cannot be delegated. When changing a label to a higher label or setting the initial dataset label, the \fB{PRIV_FILE_UPGRADE_SL}\fR privilege is required. When changing a label to a lower label or the default (\fBnone\fR), the \fB{PRIV_FILE_DOWNGRADE_SL}\fR privilege is required. Changing the dataset to labels other than the default can be done only when the dataset is not mounted. When a dataset with the default label is mounted into a labeled-zone, the mount operation automatically sets the \fBmlslabel\fR property to the label of that zone.
+.sp
+When Trusted Extensions is \fBnot\fR enabled, only datasets with the default label (\fBnone\fR) can be mounted.
+.sp
+Zones are a Solaris feature and are not relevant on Linux.
+.RE
+
+.sp
+.ne 2
+.mk
+.na
\fB\fBmountpoint\fR=\fIpath\fR | \fBnone\fR | \fBlegacy\fR\fR
.ad
.sp .6
.ad
.sp .6
.RS 4n
-Limits the amount of space consumed by the specified user. User space consumption is identified by the \fBuserspace@\fR\fIuser\fR property.
+Limits the amount of space consumed by the specified user. Similar to the \fBrefquota\fR property, the \fBuserquota\fR space calculation does not include space that is used by descendent datasets, such as snapshots and clones. User space consumption is identified by the \fBuserspace@\fR\fIuser\fR property.
.sp
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 \fBEDQUOT\fR error message . See the \fBzfs userspace\fR subcommand for more information.
.sp
.ne 2
.mk
.na
-\fB\fBsharesmb\fR=\fBon\fR | \fBoff\fR | \fIopts\fR\fR
+\fB\fBsharesmb\fR=\fBon\fR | \fBoff\fR
.ad
.sp .6
.RS 4n
-Controls whether the file system is shared by using the Solaris \fBCIFS\fR service, and what options are to be used. A file system with the \fBsharesmb\fR property set to \fBoff\fR is managed through traditional tools such as \fBsharemgr\fR(1M). Otherwise, the file system is automatically shared and unshared with the \fBzfs share\fR and \fBzfs unshare\fR commands. If the property is set to \fBon\fR, the \fBsharemgr\fR(1M) command is invoked with no options. Otherwise, the \fBsharemgr\fR(1M) command is invoked with options equivalent to the contents of this property.
+Controls whether the file system is shared by using \fBSamba USERSHARES\fR, and what options are to be used. Otherwise, the file system is automatically shared and unshared with the \fBzfs share\fR and \fBzfs unshare\fR commands. If the property is set to \fBon\fR, the \fBnet\fR(8) command is invoked to create a \fBUSERSHARE\fR.
+.sp
+Because \fBSMB\fR 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 (\fB_\fR) characters. The ZFS On Linux driver does not (yet) support additional options which might be availible in the Solaris version.
.sp
-Because \fBSMB\fR 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 (\fB_\fR) 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 \fBdata/home/john\fR is set to \fBname=john\fR, then \fBdata/home/john\fR has a resource name of \fBjohn\fR. If a child dataset of \fBdata/home/john/backups\fR, it has a resource name of \fBjohn_backups\fR.
+If the \fBsharesmb\fR property is set to \fBoff\fR, the file systems are unshared.
.sp
-When SMB shares are created, the SMB share name appears as an entry in the \fB\&.zfs/shares\fR directory. You can use the \fBls\fR or \fBchmod\fR command to display the share-level ACLs on the entries in this directory.
+In Linux, the share is created with the acl "Everyone:F" by default, meaning that everyone have read access. This however isn't the full truth: Any access control on the underlaying filesystem supersedes this.
.sp
-When the \fBsharesmb\fR 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 \fBoff\fR, or if they were shared before the property was changed. If the new property is set to \fBoff\fR, the file systems are unshared.
+.ne 2
+.mk
+.na
+\fBMinimal /etc/samba/smb.conf configuration\fR
+.sp
+.in +2
+* Samba will need to listen to 'localhost' (127.0.0.1) for the zfs utilities to communitate with samba. This is the default behavior for most Linux distributions.
+.sp
+* See the \fBUSERSHARE\fR section of the \fBsmb.conf\fR(5) man page for all configuration options.
+.sp
+.in -2
.RE
.sp
checksum property
compression property
copies property
+dedup property
devices property
exec property
+logbias property
+mlslabel property
mountpoint property
nbmand property
normalization property
pool/home/bob usedbydataset 21K -
pool/home/bob usedbychildren 0 -
pool/home/bob usedbyrefreservation 0 -
+pool/home/bob logbias latency default
+pool/home/bob dedup off default
+pool/home/bob mlslabel none default
.fi
.in -2
.sp
git://git.camperquake.de / zfs.git / blobdiff