trace_block_bio_frontmerge(9)

💅 trace_block_bio_frontmerge(9) 💅

okay bestie, welcome to the Kernel API Manual — yes that's the manual name, we're fancy here ✨ — and today's main character is trace_block_bio_frontmerge(9). buckle up 🎀

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🌸 NAME 🌸

trace_block_bio_frontmerge — it's the one that handles merging a block operation to the beginning of an existing operation. front merge, babe. the front. 💅

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✨ SYNOPSIS ✨

void trace_block_bio_frontmerge (struct bio *bio );

that's the whole signature, no cap 🫶

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🧚 ARGUMENTS 🧚

• bio — the new block operation that's getting merged 🍓 that's it, that's the argument.

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🔥 DESCRIPTION 🔥

so here's the vibe: this thing merges the block IO operation bio onto the beginning of an existing block request. literally front-of-the-line energy 👑 not the back, the front, iykyk. the way that's a different function from the backmerge one is iconic honestly.

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💜 SEE ALSO 💜

the kernel file is at ./include/trace/events/block.h — go say hi 💖 and then go meet the whole friend group:

• trace_block_touch_buffer(9)
• trace_block_dirty_buffer(9)
• trace_block_rq_requeue(9)
• trace_block_rq_complete(9)
• trace_block_rq_error(9)
• trace_block_rq_tag_wait(9)
• trace_block_rq_insert(9)
• trace_block_rq_issue(9)
• trace_block_rq_merge(9)
• trace_block_io_start(9)
• trace_block_io_done(9)
• trace_block_bio_complete(9)
• trace_block_bio_backmerge(9)
• trace_block_bio_queue(9)
• trace_block_getrq(9)
• trace_blk_zone_append_update_request_bio(9)
• trace_block_plug(9)
• trace_block_unplug(9)
• trace_block_split(9)
• trace_block_bio_remap(9)
• trace_block_rq_remap(9)
• trace_blkdev_zone_mgmt(9)

like, that's the entire group chat and they ALL ate 💀🔥

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ok that's the page!! no notes, we kept every single one of those twenty-two references, we did NOT skip the boring ones, periodt 🎀

and finally, the cute lil sign-off: this one lives under ./include/trace/events and it's dated October 2026 — screenshot it, remember it, frame it 🌈⭐ bye bestie, mwah 💖🦋