enable btrfs

This change is enough to provision and run a btrfs filesystems.

Tested workflows:
[x] provisioning (formatting)
[x] disk expansion

Author: motiejus

Dockerfile

@@ -27,7 +27,7 @@ FROM gke.gcr.io/debian-base:bookworm-v1.0.4-gke.3 AS debian
 
 # Install necessary dependencies
 # google_nvme_id script depends on the following packages: nvme-cli, xxd, bash
-RUN clean-install util-linux e2fsprogs mount ca-certificates udev xfsprogs nvme-cli xxd bash kmod lvm2 mdadm
+RUN clean-install util-linux e2fsprogs mount ca-certificates udev xfsprogs nvme-cli xxd bash kmod lvm2 mdadm btrfs-progs
 
 # Since we're leveraging apt to pull in dependencies, we use `gcr.io/distroless/base` because it includes glibc.
 FROM gcr.io/distroless/base-debian12 AS distroless-base
@@ -48,6 +48,7 @@ COPY --from=debian /etc/mke2fs.conf /etc/mke2fs.conf
 COPY --from=debian /lib/udev/scsi_id /lib/udev_containerized/scsi_id
 COPY --from=debian /bin/mount /bin/mount
 COPY --from=debian /bin/umount /bin/umount
+COPY --from=debian /bin/btrfs /bin/btrfs
 COPY --from=debian /sbin/blkid /sbin/blkid
 COPY --from=debian /sbin/blockdev /sbin/blockdev
 COPY --from=debian /sbin/dumpe2fs /sbin/dumpe2fs
@@ -131,6 +132,7 @@ COPY --from=debian /lib/${LIB_DIR_PREFIX}-linux-gnu/libselinux.so.1 \
                    /lib/${LIB_DIR_PREFIX}-linux-gnu/libnvme.so.1 \
                    /lib/${LIB_DIR_PREFIX}-linux-gnu/libsystemd.so.0 \
                    /lib/${LIB_DIR_PREFIX}-linux-gnu/libgpg-error.so.0 \
+                   /lib/${LIB_DIR_PREFIX}-linux-gnu/liblzo2.so.2 \
                    /lib/${LIB_DIR_PREFIX}-linux-gnu/libzstd.so.1 /lib/${LIB_DIR_PREFIX}-linux-gnu/
 
 COPY --from=debian /usr/lib/${LIB_DIR_PREFIX}-linux-gnu/libblkid.so.1 \

test/k8s-integration/config/sc-btrfs.yaml

@@ -0,0 +1,9 @@
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: csi-gcepd-btrfs
+provisioner: pd.csi.storage.gke.io
+parameters:
+  type: pd-balanced
+  csi.storage.k8s.io/fstype: btrfs
+volumeBindingMode: WaitForFirstConsumer

test/run-k8s-integration-ci.sh

@@ -43,7 +43,7 @@ rm -rf /usr/local/go && tar -xzf go_tar.tar.gz -C /usr/local
 # to run go commands with this go version.
 export PATH=$PATH:/usr/local/go/bin && go version && rm go_tar.tar.gz
 
-storage_classes=sc-ssd.yaml,sc-xfs.yaml
+storage_classes=sc-ssd.yaml,sc-xfs.yaml,sc-btrfs.yaml
 
 if [[ $test_pd_labels = true ]] ; then
   storage_classes=${storage_classes},sc-balanced.yaml