NVME_GET_FEATURES_RESV_MASK(2)

💖 nvme_get_features_resv_mask — bestie's guide to the reservation mask feature 💖

okay so this is a page from the libnvme API manual, section 2 (yes, the syscall/function girlies 🎀). it's nvme_get_features_resv_mask, and honestly? it's giving legacy. let's get into it.

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✨ SYNOPSIS ✨

int nvme_get_features_resv_mask (int fd , enum nvme_get_features_sel sel
, __u32 *result );

three args, one int coming back at you. slay. 🫶

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🌸 ARGUMENTS 🌸

• fd — the file descriptor of your nvme device. it's the lil handle you're holding onto to talk to the drive. 💅
• sel — which type of attribute you wanna get back. the actual list of options lives in enum nvme_get_features_sel, go peek there bestie. 👀
• result — this is where the command completion result from CQE dword0 gets dropped. it's a __u32 *, so you're passing in a pointer and the answer lands in it. ✨

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🌈 DESCRIPTION 🌈

okay so warning time:

Deprecated: doesn't support specifying a NSID. Use nvme_get_features_resv_mask2 instead. 💀

that's the whole vibe, fr fr. if you were hoping to specify a namespace ID, this function is not the one. it just doesn't do that. the glow-up version is nvme_get_features_resv_mask2 — go use her. 👑

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💜 RETURN 💜

it returns the nvme command status if a response was received — the deets for that live in enum nvme_status_field — or -1 with errno set otherwise. so like, either you got a status or you got a -1 and an errno explaining what went wrong. classic. 😭

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that's literally it, she's a short one. no cap, no extra lore. 🦋

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mwah 💋 this lil writeup came to you from the libnvme API manual, dated July 2026, and yes the footer is out here spelling nvme_get_features_resv_mask(2) twice like it's manifesting. periodt. 💅✨