STRUCT DRBD_GENLMSGHDR(9)

🌸 NAME 🌸

okay so bestie, welcome to the struct drbd_genlmsghdr(9) page — and yes, this is the Kernel API Manual, we're literally in the kernel docs rn, very main character of us 💅

struct drbd_genlmsghdr — it's the DRBD specific header that gets used in NETLINK_GENERIC requests. that's the whole vibe. it's the little label your messages wear so everyone knows what's up 🎀

✨ SYNOPSIS ✨

struct drbd_genlmsghdr {
    __u32 minor;
    union {
      __u32 flags;
      __s32 ret_code;
    };
 };

like, look at her. tiny struct, big energy ✨

🦋 Members 🦋

• minor — the device-number bestie. the way it works depends on who's talking, so let's break it down:
  • for admin requests (user -> kernel): it says which minor device to operate on.
  • for (unicast) replies or informational (broadcast) messages (kernel -> user): it says which minor device the information is about.
  • and if we're not operating on minors at all, but on connections or resources instead? then minor shall be (~0), and the attribute DRBD_NLA_CFG_CONTEXT is used instead. okay? okay 🫶
• {unnamed_union} — anonymous. that's it, that's the whole description. she's mysterious, she's unnamed, she's iconic 🙈
• flags — possible operation modifiers, and lowkey these are only relevant for user->kernel btw: DRBD_GENL_F_SET_DEFAULTS 🔥
• ret_code — the kernel->userland unicast cfg reply return code. and yes, she's in a union with flags — same memory, different eras, we love a shared living situation 💀

ngl bestie, flags and ret_code are union buddies, so they're sharing the same space. only one of them is living there at a time. no cap.

🎀 SEE ALSO 🎀

• Kernel file ./include/uapi/linux/drbd.h 👑

and that's the page, fr fr 🌈 go read the header file, it's right there, she's been waiting for you 🍓

mwah 💖 that was struct drbd_genlmsghdr(9) from the kernel source tree, at ./include/uapi/linux, dated October 2026 — catch you in the next manpage, bestie 🧚‍♀️✨