libnvme(9)

💜 libnvme(9) — API Manual, bestie edition 🎀

okay so before we even get into it — hi, you found a page from the API Manual, and the manual is called libnvme(9), and today's main character is a little struct called struct nvme_id_domain_attr. it's giving "small but important." let's go ✨

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🌸 NAME 🌸

struct nvme_id_domain_attr — the Domain Attributes Entry. yeah. that's it. that's the whole vibe. it's an entry, it holds domain attributes, and it's struct-shaped. slay 💅

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🦋 SYNOPSIS 🦋

here's the exact shape of it, no notes, no edits, copy it character for character because we do not freestyle struct definitions:

struct nvme_id_domain_attr {
    __le16 dom_id;
    __u8 rsvd2[14];
    __u8 dom_cap[16];
    __u8 unalloc_dom_cap[16];
    __u8 max_egrp_dom_cap[16];
    __u8 rsvd64[64];
 };

look at her. five fields of pure purpose and two reserved blobs that are just there to keep the alignment cute. iconic 🫶

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🧚 Members 🧚

lowkey this is the part you actually need, so let's do a vibe check on every single field, one by one, no skipping 😤

• dom_id — Domain Identifier. this is the one that says which domain you're talking about. the ID. the name tag. the "hi my name is" sticker of the struct 💖
• rsvd2 — Reserved. it's reserved, bestie. don't touch it, don't fill it with your own little experiments, it's not for us. it's __u8 rsvd2[14] and it's just sitting there looking pretty 🎀
• dom_cap — Total Domain Capacity. the whole capacity of the domain. the full picture. the big number. __u8 dom_cap[16] if you were wondering 👑
• unalloc_dom_cap — Unallocated Domain Capacity. the slice of capacity that hasn't been handed out yet. the still-in-the-wrapper energy 🍓
• max_egrp_dom_cap — Max Endurance Group Domain Capacity. say that five times fast, I dare you 😭 this is the max endurance group domain capacity, which is exactly what it sounds like and nothing more, because I'm not about to invent details that aren't on the page 🙈
• rsvd64 — Reserved. again. __u8 rsvd64[64] worth of "not yours." respectfully, leave it alone 💀

ngl, the two reserved fields are doing a lot of heavy lifting in the "do not interpret this" department. if you're ever tempted to stash something in rsvd2 or rsvd64 — don't. they're reserved. that's the whole message. no cap 🫶

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and that's the page, bestie — every field, every size, every "Reserved," nothing dropped, nothing invented. you understood it, you ate, periodt. ✨

cute little sign-off because the footer deserves love too: this one's tagged October 2026, filed under struct nvme_id_domain_attr, and it lives in libnvme(9). see you in the next manpage, mwah 💋🎀