lvextend cannot resize btrfs but if works if done manually

[txemi]

#sudo lvextend -L 20G -r /dev/mapper/vgroup1-lv1

It suceed resizing vg, but fails at filesystem resizing.
Then I type:

#sudo btrfs filesystem resize max /mnt/lv1

And it works, so I think it should be easy to fix -r param for lvextend and btrfs

txemi

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: lvm2 2.02.98-6ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
Uname: Linux 3.11.0-19-generic i686
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
Date: Fri Apr 4 13:24:14 2014
InstallationDate: Installed on 2010-11-07 (1243 days ago)
InstallationMedia: Ubuntu-Server 10.10 "Maverick Meerkat" - Release i386 (20101007)
MarkForUpload: True
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: lvm2
UpgradeStatus: Upgraded to saucy on 2013-10-02 (183 days ago)

[txemi (txemitron)]

Sorry, I made a mistake reporting this bug, I meant it succeeds resizing lv, not vg.

thanks,
txemi

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Janne Savikko (jsavikko)]

Bug present in Ubuntu Wily Werewolf development branch (because fsadm does not support btrfs).

DistroRelease: Ubuntu 15.10 (development branch)
Package: lvm2 2.02.122-1ubuntu1, btrfs-tools 4.0-2