If the expanded partition in the image contains a filesystem or LVM
PV, then if virt-resize knows how, it will resize the contents, the
equivalent of calling a command such as L<pvresize(8)>,
-L<resize2fs(8)> or L<ntfsresize(8)>. However virt-resize does not
-know how to resize some filesystems, so you would have to online
-resize them after booting the guest.
+L<resize2fs(8)>, L<ntfsresize(8)> or L<btrfs(8)>. However virt-resize
+does not know how to resize some filesystems, so you would have to
+online resize them after booting the guest.
Other options are covered below.
anything inside the PV, but see the I<--LV-expand> option. The user
could also resize LVs as desired after boot.
+=item *
+
+Btrfs filesystems, if libguestfs was compiled with support for btrfs.
+
=back
Note that you cannot use I<--expand> and I<--shrink> together.
L<lvresize(8)>,
L<resize2fs(8)>,
L<ntfsresize(8)>,
+L<btrfs(8)>,
L<virsh(1)>,
L<parted(8)>,
L<truncate(1)>,