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Support BTRFS in OEM and /usr partitions#1106
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This was referenced Jul 14, 2021
disk_util: support compressed btrfs filesystems, use btrfs for the OEM partition
flatcar/scripts#131
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Btrfs filesystems do not support a non-standard 64k page size on arm64 when the filesystem was created by a 4k page size system. Use the default page size for arm64 to ensure compatibility with btrfs filesystems created by amd64 systems.
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sys-kernel/coreos-modules: use 4k pages for arm64
Btrfs filesystems do not support a non-standard 64k page size on arm64
when the filesystem was created by a 4k page size system.
Use the default page size for arm64 to ensure compatibility with
btrfs filesystems created by amd64 systems.
sys-kernel/bootengine: support btrfs /usr filesystems
Pulls in dracut: fall back to expected dm-verity hash offset flatcar/bootengine#25
coreos-base/coreos-init: support btrfs on the OEM partition
Pulls in systemd: autodetect OEM partition filesystem flatcar/init#42
sys-apps/ignition: support btrfs on the OEM partition
Pulls in internal/resource/url: support btrfs as OEM partition filesystem flatcar/ignition#21
sys-apps/seismograph: support btrfs in rootdev utility
Pulls in rootdev: support btrfs flatcar/seismograph#6
coreos-base/update_engine: support btrfs as /usr filesystem
Pulls in Support btrfs as /usr filesystem flatcar/update_engine#11
How to use/testing done
This was built and tested with the flatcar-scripts branch
kai/btrfs-usr-oemfrom flatcar/scripts#131 in http://jenkins.infra.kinvolk.io:8080/job/os/job/manifest/3029/cldsv/ where the Flatcar image that has a btrfs /usr partition and OEM partition.While the actual switch to a btrfs filesystem on the /usr partition is only possible when all changes are part of a Stable release because update-engine needs to know how to handle the new filesystem when updating, we can already do the switch for the OEM partition. The test was run first with enabling btrfs for the /usr partition, then with reverting to select the current ext2 again.