blk_add_trace_bio(9)

💖 NAME 💖

okay so welcome to the blk_add_trace_bio(9) page from the Kernel API Manual, bestie ✨ this one is literally “Add a trace for a bio oriented action” and it’s giving kernel tracing realness 💅

✨ SYNOPSIS ✨

void blk_add_trace_bio (struct request_queue *q , struct bio *bio , u64
       what , int error );

🎀 ARGUMENTS 🎀

• q — the queue the io is for. yes bestie, that queue 🫶
• bio — the source bio, the main character of the trace 🌸
• what — the action. that’s the vibe check 👑
• error — error, if any. lowkey keep an eye on it 🙈

🦋 DESCRIPTION 🦋

Records an action against a bio. Will log the bio offset + size. no cap, that’s literally the whole description 💖

🌈 SEE ALSO 🌈

Kernel file ./kernel/trace/blktrace.c — plus these iconic cross-refs, iykyk:

• blk_trace_ioctl(9)
• blk_trace_shutdown(9)
• blk_add_trace_rq(9)
• blk_add_trace_bio_remap(9)
• blk_add_trace_rq_remap(9)
• blk_add_driver_data(9)
• blk_fill_rwbs(9)

that’s the whole page, bestie 💅 source/version is ./kernel/trace, dated October 2026 — mwah 🫶✨