STRUCT RNBD_MSG_OPEN_RSP(9)

💅 struct rnbd_msg_open_rsp(9) 💅

okay bestie, welcome to the Kernel API Manual page for struct rnbd_msg_open_rsp — it’s literally the response message to RNBD_MSG_OPEN, and it’s giving “kernel struct with main character energy” ✨.

✨ NAME ✨

struct rnbd_msg_open_rsp — response message to RNBD_MSG_OPEN

🎀 SYNOPSIS 🎀

struct rnbd_msg_open_rsp {
    struct rnbd_msg_hdr     hdr;
    __le32 device_id;
    __le64 nsectors;
    __le32 max_hw_sectors;
    __le32 max_write_zeroes_sectors;
    __le32 max_discard_sectors;
    __le32 discard_granularity;
    __le32 discard_alignment;
    __le16 physical_block_size;
    __le16 logical_block_size;
    __le16 max_segments;
    __le16 secure_discard;
    u8 obsolete_rotational;
    u8 cache_policy;
 };

🌸 Members 🌸

• hdr — the message header, obvi 💌
• device_id — device_id on the server side, used to identify the device 🪪
• nsectors — number of sectors in the usual 512b unit 🔢
• max_hw_sectors — max hardware sectors in the usual 512b unit 🛠️
• max_write_zeroes_sectors — max sectors for WRITE ZEROES in the 512b unit ✍️
• max_discard_sectors — max. sectors that can be discarded at once in 512b unit 🗑️
• discard_granularity — size of the internal discard allocation unit in bytes 📏
• discard_alignment — offset from internal allocation assignment in bytes 📐
• physical_block_size — physical block size the device supports in bytes 🧱
• logical_block_size — logical block size the device supports in bytes 🧠
• max_segments — max segments the hardware supports in one transfer 🚚
• secure_discard — supports secure discard 🔐
• obsolete_rotational — obsolete, not in used. 💀
• cache_policy — support write-back caching or FUA? 🤔

🦋 SEE ALSO 🦋

Kernel file ./drivers/block/rnbd/rnbd-proto.h is the home base for this lore, and these are the linked pages you’re gonna wanna peek at:

• 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_io(9)
• enum rnbd_io_flags(9)

okay that’s the whole page, bestie! it’s filed under ./drivers/block/rnbd, dated October 2026, and the title is still struct rnbd_msg_open_rsp(9) — now go slay your kernel reading 💖🫶