blk_mq_rq_to_pdu(9)

✨ NAME ✨

okay so bestie, this is blk_mq_rq_to_pdu(9) from the Kernel API Manual, and her whole thing is to cast a request to a PDU. no cap, that's the name and the mission 💅

🫶 SYNOPSIS 🫶

void * blk_mq_rq_to_pdu (struct request *rq );

That's the synopsis, and it's giving "one arg, one pointer back" energy ✨

💅 ARGUMENTS 💅

• rq — the request that's getting casted. literally the only argument, she's lowkey carrying the whole function 🎀

🎀 RETURN 🎀

pointer to the PDU — that's the return value, bestie, and that's the whole section 🫶

🦋 DESCRIPTION 🦋

Driver command data is immediately after the request. So add request to get the PDU. that's the whole trick, iykyk 💖

🌈 SEE ALSO 🌈

Kernel file ./include/linux/blk-mq.h — go peek, bestie 👑

• enum blk_eh_timer_return(9)
• struct blk_mq_hw_ctx(9)
• struct blk_mq_queue_map(9)
• enum hctx_type(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_rq_nr_bvec(9)
• blk_rq_passthrough_stats(9)

signed, sealed, slayed: source/version ./include/linux, date October 2026 🎀✨