nvme_identify_ns_csi(2)

✨ nvme_identify_ns_csi ✨

okay so bestie, welcome to the libnvme API manual 💖 this is page nvme_identify_ns_csi(2) and honestly? it's giving "tell me everything about this namespace but make it command set specific". iconic. let's get into it 🦋

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🌸 NAME 🌸

nvme_identify_ns_csi — I/O command set specific identify namespace data 👑

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✨ SYNOPSIS ✨

int nvme_identify_ns_csi (int fd , __u32 nsid , __u8 uuidx , enum
nvme_csi csi , void *data );

like. that's the whole vibe. five args, one int coming back at you 💅

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🎀 ARGUMENTS 🎀

• fd — File descriptor of nvme device. it's your lil ticket into the device, no cap 🎟️
• nsid — Namespace to identify. aka which namespace are we gossiping about 💬
• uuidx — UUID Index for differentiating vendor specific encoding. so the vendors can be extra and have their own secret sauce 🔍
• csi — Command Set Identifier. this is literally the whole point of the function, it's the ✨command set✨ we're asking about 🌈
• data — User space destination address to transfer the data. the lil home in userspace where the answer gets dropped off 📦

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💜 DESCRIPTION 💜

An I/O Command Set specific Identify Namespace data structure is returned for the namespace specified in nsid.

that's it, that's the tea ☕ you hand it a namespace id and a command set identifier, and it hands you back the I/O Command Set specific Identify Namespace data structure. no thoughts, just structure ✨

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🔥 RETURN 🔥

The nvme command status if a response was received (see enum nvme_status_field) or -1 with errno set otherwise.

so: if you got a response, you get the nvme command status back (peep enum nvme_status_field for the lore iykyk). if not? -1, and errno is set to tell you what went wrong 😭 not me checking errno every single time fr fr

bestie PSA 💀 if you see -1, don't just vibe — go read errno, that's where the actual answer lives 🫶

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that's the whole page, and now for the cute sign-off: this lil gem came from the libnvme API manual, it's page nvme_identify_ns_csi(2) (yes it says its own name three times, main character energy fr), and it was dated July 2026 — so it's fresh, it's current, it ate and left no crumbs 🍓🧚💜