libnvme(9)

📦 version 3.2, in arch rolling

💖 libnvme(9) — API Manual 💖

okay so bestie, welcome to libnvme(9), the API manual, and today's main character is a struct that is genuinely so niche and so iconic at the same time 🎀

✨ NAME ✨

struct nvme_lockdown_log_enhanced — the Command and Feature Lockdown Log Page, but make it Enhanced 💅 (yes there's a regular one, no we're not talking about her today)

🌸 SYNOPSIS 🌸

struct nvme_lockdown_log_enhanced {
    __u8 ver;
    __u8 cfia;
    __le16 cntlid;
    __le32 sze;
    __le16 ncfid;
    __le16 cfids;
    __u8 rsvd12[4];
    struct nvme_lockdown_cfi_desc   cfid[];
 };

like… look at her. flawless field layout. not a single byte out of place. ate and left no crumbs 🍓

🦋 Members 🦋

okay now we go through the fields one by one, no skipping, no cap:

  • ver — the Version, and bestie she is literally cleared to 0h. that's it. that's the whole vibe. ✨
  • cfia — the Command and Feature Identifier Attributes 🌈 — peep enum nvme_lockdown_log_enhanced_cfia if you wanna know the actual attribute values iykyk
  • cntlid — the Controller Identifier that this log page applies to 👑 and here's the tea: FFFFh is the special value meaning the descriptor list entries are each reported by one or more controllers in the NVM subsystem, rather than by a single controller. so it's giving group project energy, not solo main character 😭
  • sze — Size of this log page, in bytes 📏 keep up
  • ncfid — Number of Command and Feature Identifier Descriptors in cfid 🔢
  • cfids — Command and Feature Identifier Descriptors Size: the size in bytes of each entry in cfid 🎀 so like, per-entry size, not total, don't get it twisted
  • rsvd12 — Reserved 🙈 nothing to see here, eyes off, she's resting
  • cfid — the Command and Feature Identifier Descriptor list, see struct nvme_lockdown_cfi_desc 🦋 (note the brackets, she's flexible, she's a flexible array member, we love a queen who adapts 💜)
lowkey reminder that rsvd12 is reserved, so don't go writing your little experiments in there, that's not the vibe bestie 💀

and that's the whole page!! every byte accounted for, every field explained, nothing left out, periodt 💅

signing off with all the love: this was October 2026, struct nvme_lockdown_log_enhanced, from libnvme(9) 💖🫶 go forth and read your lockdown logs, bestie ✨

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