libnvme(9)

✨ libnvme(9) ✨

okay bestie, so we're diving into the libnvme API Manual (section 9, she's a kernel/API page, very serious, very demure) and today's main character is a little struct called nvme_ns_id_desc. it's giving "small but mighty" fr fr 🎀

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💖 NAME 💖

struct nvme_ns_id_desc — the Namespace identifier type descriptor. that's it, that's the vibe. a whole lil descriptor for namespace identifier types 🦋

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🌸 SYNOPSIS 🌸

here's the shape of her, exactly as she is, no cap:

struct nvme_ns_id_desc {
    __u8 nidt;
    __u8 nidl;
    __le16 rsvd;
    __u8 nid[];
 };

look at that flexible array member at the end. iconic. the way that nid[] just... keeps going. main character energy 💅

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👑 Members 👑

okay now let's meet the cast, one by one, no skipping, we respect all four 🌈

• nidt — the Namespace Identifier Type. if you wanna know which type it is, go look at enum nvme_ns_id_desc_nidt. she's tagged 💖
• nidl — the Namespace Identifier Length. this one holds the length, in bytes, of struct nvme_id_ns.nid. literally just a length. tiny but crucial 🧚
• rsvd — Reserved. that's it. that's the whole member. leave her alone, she's reserved 🙈 (do NOT touch, do NOT write, she's resting)
• nid — the Namespace Identifier! this holds a value that is globally unique and gets assigned to the namespace when that namespace is created. and its length? defined over in struct nvme_id_ns.nidl. so bestie, if you're wondering how long it is, the answer lives in another struct. iykyk 🔥

lowkey important: nid is a flexible array member, so it's __u8 nid[] — no size baked in, its length comes from struct nvme_id_ns.nidl. don't go assuming a fixed size, that's not the vibe ⭐

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🫶 a lil sign-off 🫶

and that's the whole page, bestie — slay, you ate that. this one's from the libnvme(9) API Manual, dated October 2026, and the subject of the day was struct nvme_ns_id_desc. go forth and identify those namespace types correctly, periodt 💜🌸

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