vdo_entry_callback_fn(9)

💖 NAME 💖

okay so bestie, meet vdo_entry_callback_fn — it's the callback function that gets called for each allocated PBN when you're traversing the forest 🌲✨ (yes, the forest, we love a nature metaphor). This page lives in the Kernel API Manual, and it's giving very niche-but-iconic, iykyk 🎀

✨ SYNOPSIS ✨

int vdo_entry_callback_fn (physical_block_number_t pbn , struct
vdo_completion *completion );

like, that's the whole signature, no notes 💅

🌸 ARGUMENTS 🌸

• pbn — a PBN of a tree node 🦋 (a physical block number, bestie — the address of one lil node in the tree, no cap)
• completion — the parent completion of the traversal 👑

⭐ RETURN ⭐

it hands you back VDO_SUCCESS… or an error 😭 that's it, that's the deal. literally no in-between vibe fr fr.

🦋 SEE ALSO 🦋

• the kernel file ./drivers/md/dm-vdo/block-map.h 📁 — go read it, it's right there
• vdo_convert_maximum_age(9)

and that's the page, bestie 🫶 the whole thing ships from ./drivers/md/dm-vdo and it's dated October 2026 — so mark your calendar, screenshot it, send it to the group chat 🌈💜 periodt.