Merge branch 'apatil-master'

* apatil-master:
  always allocate largest Mount slice
  add missing Unmount/Mount docs
  rename Umount -> Unmount to follow zfs command name
  Added mount and umount methods
  Small fix to rename.
  Added Rename

Author: mmlb

zfs.go

@@ -180,6 +180,46 @@ func (d *Dataset) Clone(dest string, properties map[string]string) (*Dataset, er
 	return GetDataset(dest)
 }
 
+// Unmount unmounts currently mounted ZFS file systems.
+func (d *Dataset) Unmount(force bool) (*Dataset, error) {
+	if d.Type == DatasetSnapshot {
+		return nil, errors.New("cannot unmount snapshots")
+	}
+	args := make([]string, 1, 3)
+	args[0] = "umount"
+	if force {
+		args = append(args, "-f")
+	}
+	args = append(args, d.Name)
+	_, err := zfs(args...)
+	if err != nil {
+		return nil, err
+	}
+	return GetDataset(d.Name)
+}
+
+// Mount mounts ZFS file systems.
+func (d *Dataset) Mount(overlay bool, options []string) (*Dataset, error) {
+	if d.Type == DatasetSnapshot {
+		return nil, errors.New("cannot mount snapshots")
+	}
+	args := make([]string, 1, 5)
+	args[0] = "mount"
+	if overlay {
+		args = append(args, "-O")
+	}
+	if options != nil {
+		args = append(args, "-o")
+		args = append(args, strings.Join(options, ","))
+	}
+	args = append(args, d.Name)
+	_, err := zfs(args...)
+	if err != nil {
+		return nil, err
+	}
+	return GetDataset(d.Name)
+}
+
 // ReceiveSnapshot receives a ZFS stream from the input io.Reader, creates a
 // new snapshot with the specified name, and streams the input data into the
 // newly-created snapshot.
@@ -275,6 +315,26 @@ func (d *Dataset) GetProperty(key string) (string, error) {
 	return out[0][2], nil
 }
 
+// Rename renames a dataset.
+func (d *Dataset) Rename(name string, createParent bool, recursiveRenameSnapshots bool) (*Dataset, error) {
+	args := make([]string, 3, 5)
+	args[0] = "rename"
+	args[1] = d.Name
+	args[2] = name
+	if createParent {
+		args = append(args, "-p")
+	}
+	if recursiveRenameSnapshots {
+		args = append(args, "-r")
+	}
+	_, err := zfs(args...)
+	if err != nil {
+		return d, err
+	}
+
+	return GetDataset(name)
+}
+
 // Snapshots returns a slice of all ZFS snapshots of a given dataset.
 func (d *Dataset) Snapshots() ([]*Dataset, error) {
 	return Snapshots(d.Name)