drbd: replace genl_magic with explicit netlink serialization

2026-05-09T01:23:23+00:00

Replace the genl_magic multi-include macro system with explicit serialization and parsing. The *_gen files were initially produced from a YNL spec via a customized ynl-gen-c, but the DRBD netlink family is effectively frozen, so the generator is kept unmodified. All new functionality will land in a separate, properly-designed family. Carry the resulting code as ordinary in-tree source rather than landing the spec and generator changes that produced it. The bulk of the changes are mechanical renames to fit the YNL naming conventions: - Handler functions: drbd_adm_* -> drbd_nl_*_doit/dumpit - GENL_MAGIC_VERSION -> DRBD_FAMILY_VERSION - GENL_MAGIC_FAMILY_HDRSZ -> sizeof(struct drbd_genlmsghdr) - drbd_genl_family -> drbd_nl_family - Attribute IDs: T_* -> DRBD_A_* Remove the nested_attr_tb static global buffer and move to a per-call allocation approach: each deserialization manages its own nested attribute table. This will be needed anyway when we eventually move to parallel_ops, and it's actually simpler this way, so make the move now. Replace the functionality of the "sensitive" flag: this was only used by a single field (shared_secret); open-code redaction logic for that locally. Also replace the "invariant" flag: this only had a couple of users, and those basically never change. Hard code the check directly inline. The genl_family struct itself is defined manually in drbd_nl.c. Also replace a couple of drbd-specific wrappers (nla_put_u64_0pad, drbd_nla_find_nested) with standard kernel functions while we're at it. Finally, completely remove the genl_magic system; DRBD was its only user. Signed-off-by: Christoph Böhmwalder Acked-by: Jakub Kicinski Link: https://patch.msgid.link/20260506124541.1951772-3-christoph.boehmwalder@linbit.com Signed-off-by: Jens Axboe

kernel/linux.git/include/uapi/linux/drbd_genl.h, branch v7.2-rc1

drbd: replace genl_magic with explicit netlink serialization