zfs: add idmapped mount support for rootless containers #621
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Apply idmapped mounts to ZFS storage layers when UID/GID mappings are provided. This translates file ownership through the user namespace mapping, allowing containers to perform chown operations that appear as root inside the container but map to unprivileged UIDs on the host. The overlay and btrfs drivers already support idmapped mounts; this brings ZFS to feature parity for rootless container support. This works in conjunction with ZFS's zoned_uid property (proposed separately to OpenZFS) which delegates dataset operations to user namespaces, enabling full rootless podman/docker with native ZFS storage. Signed-off-by: Colin K. Williams <colin@li-nk.org>
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is this still a WIP? |
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Just working through the PR through OpenZFS and I will open this. |
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@giuseppe do you have any feedback? |
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Apply idmapped mounts to ZFS storage layers when UID/GID mappings are
provided. This translates file ownership through the user namespace
mapping, allowing containers to perform chown operations that appear
as root inside the container but map to unprivileged UIDs on the host.
The overlay and btrfs drivers already support idmapped mounts; this
brings ZFS to feature parity for rootless container support.
This works in conjunction with ZFS's zoned_uid property proposed
separately to OpenZFS which delegates dataset operations to user
namespaces, enabling full rootless podman/docker with native ZFS
storage.
Signed-off-by: Colin K. Williams colin@li-nk.org
Resolves #147