nvme_set_fe..._volatile_wc(2)

✨ nvme_set_features_volatile_wc(2) ✨

okay bestie, welcome to the libnvme API manual 💖 this one's a lil function called nvme_set_features_volatile_wc, and she's the one who flips your drive's write cache on and off. main character behavior fr.

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🎀 NAME 🎀

nvme_set_features_volatile_wc — Set volatile write cache feature

like. it sets the volatile write cache feature. that's the whole job. no cap.

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🦋 SYNOPSIS 🦋

int nvme_set_features_volatile_wc (int fd , bool wce , bool save , __u32
*result );

she takes a file descriptor, two lil booleans, and a pointer to a __u32. so basically four things and she's done. love that for her. ✨

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🌸 ARGUMENTS 🌸

• fd — File descriptor of nvme device. this is your lil hall pass, the thing you gotta have to even talk to the drive. no fd, no vibes.
• wce — Write cache enable. bool. you're telling the drive whether you want that write cache ON or OFF. yes or no, bestie, no in-between.
• save — Save value across power states. bool. do you want this setting to survive a power cycle, or is it giving short-term commitment? your call. 🙈
• result — The command completion result from CQE dword0. it's a __u32 *, so it's a pointer, and the completion result gets dropped in there. that's where the drive tells you what happened.

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💅 RETURN 💅

she gives you back the nvme command status if a response was received — go peek at enum nvme_status_field for the full deets, iykyk.

and if no response came back? you get -1 and errno gets set. classic. 💀

heads up bestie: -1 means something went sideways and errno is holding the receipts. always check it, don't just vibe past it.

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and that's the whole page, bestie, you ate it 🫶 go set some write cache features and be iconic.

~ fin ~ 🧚‍♀️

this was the libnvme API manual, page for nvme_set_features_volatile_wc, dated July 2026. mwah. 💖