nvme_get_features_data(2)

✨ nvme_get_features_data(2) ✨

okay bestie, so this one's from the libnvme API manual and it's literally the little helper that does the heavy lifting for nvme_get_features(). she's not the main character, she's the best friend holding the main character's bag — but the bag is feature data and it's important, so 💅

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🎀 NAME 🎀

nvme_get_features_data — the helper function for @nvme_get_features()

like. she's support staff. but the good kind.

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🌸 SYNOPSIS 🌸

int nvme_get_features_data (int fd , enum nvme_features_id fid , __u32
nsid , __u32 data_len , void *data , __u32 *result );

yes the spacing is giving "written at 3am by a C programmer" but we respect it. no cap.

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💖 ARGUMENTS 💖

• fd — the file descriptor of the nvme device. your entry ticket, your VIP wristband, the whole vibe check 🫶
• fid — the Feature identifier. which feature are we talking about? she tells you.
• nsid — Namespace ID, but only if applicable. sometimes it's needed, sometimes she's off the clock, yk?
• data_len — the length of the feature data, if applicable, measured in bytes. yes, bytes. count carefully, queen. 📏
• data — the user address of the feature data, if applicable. that's where the stuff goes. that's the spot. ✨
• result — the command completion result from CQE dword0. fancy little number from the completion queue entry, she's serving raw data 💅

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🔥 RETURN 🔥

so here's the tea:

• if a response came back, you get the nvme command status — peek at enum nvme_status_field for the full list of possibilities.
• otherwise you get -1 with errno set. that's the sad path. we don't love her but we must respect her. 😭

ngl, always check errno when you get that -1. she knows what went wrong, don't leave her on read.

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🦋 that's it, that's the page 🦋

that's the whole thing, bestie. short, sweet, does exactly one job and does it well. iconic behaviour only 👑

this has been the libnvme API manual, July 2026 edition — go forth and get those features fr fr 💜🌸🎀