libnvme(2)

👑 libnvme — API Manual, section 2 🎀

okay bestie, welcome to libnvme's manual page, section 2, and today's main character is literally one little enum. yes, an enum. and no, I'm not being dramatic — it's giving "quietly runs your entire NVMe format situation" energy. let's get into it 💅

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✨ NAME ✨

enum nvme_flbas — this field indicates the formatted LBA size 🦋

like. that's the whole vibe. the FLBAS field. it's the one telling you what LBA size you're formatted to. iconic behavior fr fr.

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🌸 SYNOPSIS 🌸

enum nvme_flbas {
    NVME_FLBAS_LOWER_SHIFT ,
    NVME_FLBAS_META_EXT_SHIFT ,
    NVME_FLBAS_HIGHER_SHIFT ,
    NVME_FLBAS_LOWER_MASK ,
    NVME_FLBAS_META_EXT_MASK ,
    NVME_FLBAS_HIGHER_MASK

};

six entries. three shifts, three masks. that's it, that's the whole enum, and honestly? slay. 🌈

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⭐ Constants ⭐

bestie, this is where the lore lives. each one of these is a shift amount or a mask for pulling apart the FLBAS field, so let me break them down one by one like the devoted bestie I am 🫶

• NVME_FLBAS_LOWER_SHIFT — the shift amount you use to get the format index's least significant 4 bits 💖
• NVME_FLBAS_META_EXT_SHIFT — the shift amount to get the metadata transferred ✨
• NVME_FLBAS_HIGHER_SHIFT — the shift amount to get the format index's most significant 2 bits 👑
• NVME_FLBAS_LOWER_MASK — the mask to get the format index's least significant 4 bits 🎀
• NVME_FLBAS_META_EXT_MASK — the mask to get the metadata transferred 🌸
• NVME_FLBAS_HIGHER_MASK — the mask to get the format index's most significant 2 bits 💜

so if you ever forget: the format index is literally split across two spots — LOWER (the bottom 4 bits) and HIGHER (the top 2 bits) — and META_EXT is doing its own little thing about metadata transferred. mask it, shift it, boom, you're done. no cap. 🔥

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and that's the page!! thanks for reading my little enum TED talk, bestie 🧚💖 this was enum nvme_flbas out of libnvme(2), and this cutie dropped back in July 2026. go format something responsibly, mwah 💅✨