3 files changed, 65 insertions, 0 deletions
diff --git a/lib/ManaTools/Shared/disk_backend/BlockDevice.pm b/lib/ManaTools/Shared/disk_backend/BlockDevice.pm
index f20c0fda..9acce67e 100644
--- a/lib/ManaTools/Shared/disk_backend/BlockDevice.pm
+++ b/lib/ManaTools/Shared/disk_backend/BlockDevice.pm
@@ -190,4 +190,27 @@ sub sync_majorminor {
     }
 }
 
+#=============================================================
+
+=head2 find_path
+
+=head3 DESCRIPTION
+
+    this method finds in descendants the Mount part and gets the path from it
+
+=cut
+
+#=============================================================
+sub find_path {
+    my $self = shift;
+    my $partstate = shift;
+    # finding a path only works if one has a Mount or Mountable child,
+    my @children = $self->children($partstate);
+    for my $child (@children) {
+        return $child->path() if ($child->isa('ManaTools::Shared::disk_backend::Part::Mount'));
+        return $child->find_path($partstate) if ($child->does('ManaTools::Shared::disk_backend::Mountable'));
+    }
+    return undef;
+}
+
 1;
diff --git a/lib/ManaTools/Shared/disk_backend/Mountable.pm b/lib/ManaTools/Shared/disk_backend/Mountable.pm
index abe8404d..33cb1463 100644
--- a/lib/ManaTools/Shared/disk_backend/Mountable.pm
+++ b/lib/ManaTools/Shared/disk_backend/Mountable.pm
@@ -61,4 +61,27 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
 use Moose::Role;
 
+#=============================================================
+
+=head2 find_path
+
+=head3 DESCRIPTION
+
+    this method finds in descendants the Mount part and gets the path from it
+
+=cut
+
+#=============================================================
+sub find_path {
+    my $self = shift;
+    my $partstate = shift;
+    # finding a path only works if one has a Mount or Mountable child,
+    my @children = $self->children($partstate);
+    for my $child (@children) {
+        return $child->path() if ($child->isa('ManaTools::Shared::disk_backend::Part::Mount'));
+        return $child->find_path($partstate) if ($child->does('ManaTools::Shared::disk_backend::Mountable'));
+    }
+    return undef;
+}
+
 1;
diff --git a/lib/ManaTools/Shared/disk_backend/Plugin/Btrfs.pm b/lib/ManaTools/Shared/disk_backend/Plugin/Btrfs.pm
index 4c7cb707..508a298d 100644
--- a/lib/ManaTools/Shared/disk_backend/Plugin/Btrfs.pm
+++ b/lib/ManaTools/Shared/disk_backend/Plugin/Btrfs.pm
@@ -288,5 +288,24 @@ class_has '+restrictions' => (
     }
 );
 
+around('find_path', sub {
+    my $orig = shift;
+    my $self = shift;
+    my $partstate = shift;
+
+    # first try the standard method
+    my $path = $self->$orig($partstate);
+    return $path if (defined $path);
+
+    # subvolumes can check parent subvolumes and add the relative path
+    my @parents = $self->find_parts($partstate, 'parent');
+    for my $parent (@parents) {
+        if ($parent->isa('ManaTools::Shared::disk_backend::Part::BtrfsVol')) {
+            $path = $parent->find_path($partstate);
+            return $path . substr($self->prop('label'), length($parent->prop('label'))) if defined($path);
+        }
+    }
+    return undef;
+});
 
 1;