STRUCT RNBD_MSG_IO(9)

💅 struct rnbd_msg_io(9)

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for struct rnbd_msg_io, and it's literally the message for I/O read/write. no cap. it's giving "tiny struct, big job" and honestly? iconic. 🎀

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✨ NAME ✨

struct rnbd_msg_io — the message for I/O read/write 🫶 like that's it, that's the whole vibe, it's the lil packet that carries your read/write asks across the wire.

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🌸 SYNOPSIS 🌸

here's the whole glow-up, laid out exactly as the kernel gods wrote it:

struct rnbd_msg_io {
    struct rnbd_msg_hdr hdr;
    __le32 device_id;
    __le64 sector;
    __le32 rw;
    __le32 bi_size;
    __le16 prio;
 };

look at her. six fields. perfectly accessorized. 💅

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🦋 Members 🦋

okay let's meet the cast, member by member, no skips:

• hdr — the message header 💌 every message's gotta have one, it's the little name tag at the party.
• device_id — the device_id on the server side, used to find the right device 🔍 like a "you are here" map but for block devices.
• sector — the bi_sector attribute from struct bio 📍 so we know where in the device we're poking.
• rw — the read/write situation; valid values are defined in enum rnbd_io_flags 🔥 (iykyk).
• bi_size — the number of bytes for the I/O read/write 📏 like, how much data are we actually moving here.
• prio — priority ⭐ that's it, that's the description, she's a __le16 and she's prioritized.

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🌈 SEE ALSO 🌈

go read these next, bestie, they're all in the kernel file ./drivers/block/rnbd/rnbd-proto.h 📂:

• enum rnbd_msg_type(9)
• struct rnbd_msg_hdr(9)
• struct rnbd_msg_sess_info(9)
• struct rnbd_msg_sess_info_rsp(9)
• struct rnbd_msg_open(9)
• struct rnbd_msg_close(9)
• struct rnbd_msg_open_rsp(9)
• enum rnbd_io_flags(9)

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💀 reminder that this whole crew lives in ./drivers/block/rnbd and they're a package deal — don't read one without at least peeking at the header file. fr fr.

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and that's the page!! tysm for coming to my ted talk 🧚💜 this one's served fresh from ./drivers/block/rnbd, dated October 2026, and she's filed under struct rnbd_msg_io(9) — slay, bye! 👑🍓