btrfs-modules-3.2.0-4-iop32x-d software package provides BTRFS filesystem support, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install btrfs-modules-3.2.0-4-iop32x-d
btrfs-modules-3.2.0-4-iop32x-d is installed in your system.
Make ensure the btrfs-modules-3.2.0-4-iop32x-d package were installed using the commands given below,
$ sudo dpkg-query -l | grep btrfs-modules-3.2.0-4-iop32x-d*
You will get with btrfs-modules-3.2.0-4-iop32x-d package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | debian-installer udeb packages |
| Package | btrfs-modules-3.2.0-4-iop32x-d |
| Version | 3.2.78-1 |
| Description | BTRFS filesystem support |
| Sub Section | Debian-installer |