libnvme(9)

💖 libnvme(9) — the API Manual, but make it a group chat 💖

okay so bestie, welcome to libnvme(9), the API manual ✨ and today's main character is one very specific struct. she's a little chunky, she's got a lot of __le32 energy, and honestly? she ate. let's get into it 🫶

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✨ NAME ✨

struct nvme_nvm_id_ns — the NVME Command Set I/O Command Set Specific Identify Namespace Data Structure 🌸

like, that's her full government name. yes it's a mouthful. no we're not shortening it. periodt 💅

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🦋 SYNOPSIS 🦋

here's the whole vibe, verbatim, no cap:

struct nvme_nvm_id_ns {
    __le64 lbstm;
    __u8 pic;
    __u8 pifa;
    __u8 rsvd10[2];
    __le32 elbaf[64];
    __le32 npdgl;
    __le32 nprg;
    __le32 npra;
    __le32 nors;
    __le32 npdal;
    __le32 lbapss;
    __le32 tlbaag;
    __u8 rsvd296[3800];
 };

not me counting the padding… there's rsvd10[2] early on and then rsvd296[3800] at the end, so she is mostly reserved space lowkey 😭 the real ones are hiding in there and that's the whole point of the struct. iykyk.

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🎀 Members 🎀

okay this is the actual tea ☕ every single field, in order, with her little one-liner. don't skip a single one, bestie, they all matter:

• lbstm — Logical Block Storage Tag Mask ✨ (__le64, so she's the big one at the top, main character energy fr)
• pic — Protection Information Capabilities 💜
• pifa — Protection Information Format Attribute 🎀
• rsvd10 — Reserved 🙈 (__u8[2], like… she's just holding space, we love a generous queen)
• elbaf — List of Extended LBA Format Support 🌈 and yes she's an array — __le32[64] — sixty-four of them, obsessed
• npdgl — Namespace Preferred Deallocate Granularity Large 🔥
• nprg — Namespace Preferred Read Granularity ⭐
• npra — Namespace Preferred Read Alignment 🦋
• nors — Namespace Optimal Read Size 🌸
• npdal — Namespace Preferred Deallocate Alignment Large 👑
• lbapss — LBA Format Placement Shard Size 💖
• tlbaag — Tracked LBA Allocation Granularity 💅
• rsvd296 — Reserved 💀 (__u8[3800] — three thousand eight hundred bytes of pure "no thoughts head empty" and honestly? relatable)

ngl bestie, the two Reserved fields are just padding — they exist to keep the layout right, so don't go reading anything into them, okay? they're not hiding secrets, they're just vibing 🫶

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and that's the whole page! no flags, no exit statuses, no environment variables — just one struct and her twelve fields, slaying in a fixed order 🌟

sign-off time 🧚 this little love letter to struct nvme_nvm_id_ns is from the libnvme(9) manual — the API Manual, dated October 2026 — and she's out 💖✨🎀🦋 bye bestie, go interrogate some namespaces for me 💜