libnvme(9)

💅 libnvme(9) — the API Manual, bestie edition 🎀

okay so this is a page from the libnvme API manual (yes, libnvme(9), she's famous ✨) and it's honestly a tiny one, so let's just get into it 🫶

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🌸 NAME 🌸

enum nvme_id_ctrl_vwc — literally the Volatile write cache enum. that's her whole job. iconic for that ngl 💜

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✨ SYNOPSIS ✨

here's exactly what she looks like, no cap, copy it character for character:

enum nvme_id_ctrl_vwc {
    NVME_CTRL_VWC_PRESENT ,
    NVME_CTRL_VWC_FLUSH

};

two constants, one enum, zero drama 🦋 (except the drama that the write cache itself brings, we'll get there).

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👑 Constants 👑

💖 NVME_CTRL_VWC_PRESENT

if this bit is set, it indicates a volatile write cache is present. so like… she exists, she's real, she's in the building 💅

and if a volatile write cache is present, then the host controls whether the volatile write cache is enabled with a Set Features command specifying the value NVME_FEAT_FID_VOLATILE_WC. so the host is the main character here and the cache is taking direction from her, periodt 👑

🫶 tiny vibe check: the host is the one flipping that switch — it's the Set Features command with NVME_FEAT_FID_VOLATILE_WC that does it. remember the exact name, iykyk.

🎀 NVME_CTRL_VWC_FLUSH

this one is a mask to get the value of the flush command behavior. that's it. she's a mask, she reveals the flush behavior, she ate and left no crumbs 🍓

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that's the whole page bestie, she's short but she said what she said 💀✨

mwah 💋 this little moment was brought to you by the October 2026 edition of the libnvme(9) manual — go drink some water, then go flush that cache responsibly 🌈💜