libnvme(2)

💖 libnvme — struct nvme_copy_range_f3 💖

okay so bestie, welcome to the libnvme API Manual 🎀 — this is a page from the libnvme(2) crew, and today's main character is a little struct called nvme_copy_range_f3. it's giving Copy — Source Range Entries Descriptor Format 3h ✨ no cap, that's literally what it is.

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🌸 NAME 🌸

struct nvme_copy_range_f3 — Copy — Source Range Entries Descriptor Format 3h 💅

like. it's the Format 3h flavour of a copy source range descriptor. that's the whole vibe. periodt.

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✨ SYNOPSIS ✨

struct nvme_copy_range_f3 {
    __le32 snsid;
    __u8 rsvd4[4];
    __le64 slba;
    __le16 nlb;
    __u8 rsvd18[4];
    __le16 sopt;
    __u8 rsvd24[2];
    __u8 elbt[10];
    __le16 elbat;
    __le16 elbatm;
 };

look at her. 🦋 ten fields, all laid out exactly like that, don't you dare reorder them. the reserved bits are there for a reason even if they're just sitting pretty doing nothing. iykyk.

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👑 Members 👑

bullet by bullet, field by field, let's go:

• snsid — Source Namespace Identifier 🌈 the nsid of the namespace the copy is reading from, bestie.
• rsvd4 — Reserved 🙈 exactly what it says. hands off.
• slba — Starting LBA ⭐ where the source range kicks off on the drive.
• nlb — Number of Logical Blocks 🔥 how many logical blocks we're talking about.
• rsvd18 — Reserved 🙈 again. reserved. stay out of it.
• sopt — Source Options 💅 the options for the source side of the copy.
• rsvd24 — Reserved 🙈 third reserved field, still reserved, still not yours.
• elbt — Expected Initial Logical Block Reference Tag / Expected Logical Block Storage Tag 🌸 yes both of those things, that's the full description, i'm not paraphrasing it away.
• elbat — Expected Logical Block Application Tag 🫶 the application tag you expect.
• elbatm — Expected Logical Block Application Tag Mask 🧚 and here's the mask that goes with it.

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reminder bestie: those three rsvd* fields are Reserved. do not touch, do not write, do not make it weird. 🫶

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and that's the whole page, angel. 💜 this was struct nvme_copy_range_f3 from the libnvme(2) API Manual, July 2026 edition — mwah, slay, go forth and copy ranges responsibly. 🎀✨🦋