launch_data_...nal_callback(9)

✨ NAME ✨

ok so this is launch_data_vio_journal_callback — and this page lives in section 9 of the Kernel API Manual, bestie 🫶

What it does, in the words of the page itself: it sets a callback as a journal operation and invokes it immediately. That's it, that's the whole vibe check 💅

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💖 SYNOPSIS 💖

void launch_data_vio_journal_callback (struct data_vio *data_vio ,
vdo_action_fn callback );

like, that's the whole shape of it. void return, two args, no notes ✨

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🎀 ARGUMENTS 🎀

ngl, the documentation here is giving mysterious 🙈 the original page literally leaves both of these as -- undescribed --, and I'm not about to make stuff up, so:

• data_vio — -- undescribed -- 😭 (that's a struct data_vio *, per the synopsis, and that's all we're given)
• callback — -- undescribed -- 🙈 (type vdo_action_fn in the synopsis, and that's genuinely the whole story)

lowkey iconic that both parameters got the same energy. fr fr. if you want the real lore on what these carry, the header file below is the place to look 👑

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/md/dm-vdo/data-vio.h 👑 — the source of truth, go read it
• continue_data_vio_with_error(9)
• launch_data_vio_hash_zone_callback(9)
• launch_data_vio_logical_callback(9)
• launch_data_vio_allocated_zone_callback(9)
• launch_data_vio_duplicate_zone_callback(9)
• launch_data_vio_packer_callback(9)
• launch_data_vio_cpu_callback(9)
• launch_data_vio_bio_zone_callback(9)
• launch_data_vio_on_bio_ack_queue(9)

like it's a whole callback family reunion and everyone showed up 🎉 literally the entire launch_data_vio_*_callback friend group, plus the error-continuation one. obsessed.

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🌸 sign-off time 🌸

this lil love letter comes from the kernel source tree at ./drivers/md/dm-vdo, dated October 2026, and it's filed under launch_data_...nal_callback(9) in section 9 of the Kernel API Manual 🎀🦋 stay slay, call your callbacks, and always read the header file first 💜✨