libnvme(2)

💖 libnvme(2) — the API Manual bestie edition 💖

okay so you opened a man page from libnvme and it's giving very specific, very niche, very iconic. we're talking the raw API layer here. sit down, grab a boba, let's go 🧋✨

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✨ NAME ✨

enum nvme_id_ctrl_trattr — Tracking Attributes

like… the tracking attributes, bestie. it's right there in the name. 💅

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🌸 SYNOPSIS 🌸

enum nvme_id_ctrl_trattr {
    NVME_CTRL_TRATTR_THMCS_SHIFT ,
    NVME_CTRL_TRATTR_TUDCS_SHIFT ,
    NVME_CTRL_TRATTR_MRTLL_SHIFT ,
    NVME_CTRL_TRATTR_THMCS_MASK ,
    NVME_CTRL_TRATTR_TUDCS_MASK ,
    NVME_CTRL_TRATTR_MRTLL_MASK

};

no cap, that's the whole enum. six members, zero drama, all vibes. 🦋

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👑 Constants 👑

🌈 the SHIFTs

• NVME_CTRL_TRATTR_THMCS_SHIFT — this is the shift amount you use to pull the Track Host Memory Changes Support out of the struct nvme_id_ctrl.trattr field. shifting is the whole move here, fr fr. 🫶
• NVME_CTRL_TRATTR_TUDCS_SHIFT — shift amount for getting the Track User Data Changes Support out of that same struct nvme_id_ctrl.trattr field. yes, same field, different little slice. it's giving "sharing is caring". 💜
• NVME_CTRL_TRATTR_MRTLL_SHIFT — shift amount to grab the Memory Range Tracking Length Limit from struct nvme_id_ctrl.trattr. the limit!! the range!! the tracking!! 😭

💅 the MASKs

• NVME_CTRL_TRATTR_THMCS_MASK — a mask that gets you the Track Host Memory Changes Support from the struct nvme_id_ctrl.trattr field. mask + shift = the classic duo, they ate. ⭐
• NVME_CTRL_TRATTR_TUDCS_MASK — mask for pulling the Track User Data Changes Support out of struct nvme_id_ctrl.trattr. apply it, get the bits, main character energy. 🔥
• NVME_CTRL_TRATTR_MRTLL_MASK — the mask that gets you the Memory Range Tracking Length Limit from struct nvme_id_ctrl.trattr. last one, but definitely not least. 💖

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vibe check: every single one of these constants is reading out of the exact same field — struct nvme_id_ctrl.trattr — just different slices of it. shifts move you there, masks isolate the bits. iykyk. 🙈

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and that's the whole page, bestie — you understood it, you slayed it, periodt. 🎀

this little gem is from the libnvme API Manual, and it's dated July 2026 — page libnvme(2), section enum nvme_id_ctrl_trattr. obsessed with her honestly. 🌸🦋✨