ENUM HCTX_TYPE(9)

🌸 NAME 🌸

enum hctx_type — the type of hardware queue, bestie. That's it, that's the whole vibe check 💅

So this is a page straight out of the Kernel API Manual, and lowkey it's a tiny one — but it's iconic for what it does, fr fr.

✨ SYNOPSIS ✨

enum hctx_type {
    HCTX_TYPE_DEFAULT ,
    HCTX_TYPE_READ ,
    HCTX_TYPE_POLL ,
    HCTX_MAX_TYPES

};

Look at her. Four little members, no cap, and she runs the whole hardware-queue situation 🫶

🎀 CONSTANTS 🎀

Okay so here's the breakdown of every single one of them — every flag gets its moment, no member left behind 👑

• HCTX_TYPE_DEFAULT — the catch-all queen 👑 — all I/O that's not otherwise accounted for. If it doesn't fit anywhere else, it goes here, periodt.
• HCTX_TYPE_READ — the one that's just for READ I/O. Reads only. Nothing else invited to this party 🌸
• HCTX_TYPE_POLL — polled I/O of any kind. Any kind!! she's flexible like that 🦋
• HCTX_MAX_TYPES — the count 💀 — literally just the number of types of hctx. Not an actual type, she's the tally, the vibe-check counter, the "how many of y'all are there" energy.

Ngl, HCTX_MAX_TYPES looks like a type and is not one — it's the total number of types. Don't @ me, that's just how she is 🙈

💜 SEE ALSO 💜

Go read these next, bestie, they're all in the kernel file ./include/linux/blk-mq.h 🎀

• enum blk_eh_timer_return(9)
• struct blk_mq_hw_ctx(9)
• struct blk_mq_queue_map(9)
• struct blk_mq_tag_set(9)
• struct blk_mq_queue_data(9)
• struct blk_mq_ops(9)
• blk_mq_rq_state(9)
• blk_mq_add_to_batch(9)
• blk_mq_rq_from_pdu(9)
• blk_mq_rq_to_pdu(9)
• blk_rq_nr_bvec(9)
• blk_rq_passthrough_stats(9)

Okay that's the whole page, you ate that 🍓 This little icon came from ./include/linux, dated October 2026, and she goes by enum hctx_type(9) — mwah, love her for her, see u next manpage ✨💖🧚