vdo_drain_packer(9)

💖 vdo_drain_packer(9) — the kernel API manual, but make it make sense 💖

okay so bestie, welcome to vdo_drain_packer(9), a real page from the kernel API manual and honestly? it's giving "short but iconic." no cap, we're gonna get through this together in like two minutes. 🎀

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✨ NAME ✨

vdo_drain_packer — drains the packer by literally not letting any more VIOs get into the packer, and then flushing. that's it. that's the whole vibe. 🦋

think of it like closing the door to the party so nobody else can come in, and then clearing the room. main character energy fr fr.

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🌸 SYNOPSIS 🌸

void vdo_drain_packer (struct packer *packer , struct vdo_completion
*completion );

that's the whole signature, exactly as written, don't @ me. 💅

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🫶 ARGUMENTS 🫶

• packer — the packer you wanna drain. like, this one. the one you're pointing at. our little guy. 🥺
• completion — the completion that gets finished once the packer has actually drained. so like, when the draining is done, this is what gets the "we're done here" tap on the shoulder. ✨

lowkey important: the completion is what tells the rest of the world the drain actually finished. it's not decorative, bestie, it's the whole callback situation. 🫡

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👑 SEE ALSO 👑

the kernel file lives right here: ./drivers/md/dm-vdo/packer.c — go read it, it's a whole journey. 📖

and here's the entire crew, no cap, every single one, exactly as listed:

• vdo_get_compressed_block_fragment(9)
• assert_on_packer_thread(9)
• insert_in_sorted_list(9)
• make_bin(9)
• vdo_make_packer(9)
• vdo_free_packer(9)
• get_packer_from_data_vio(9)
• vdo_get_packer_statistics(9)
• abort_packing(9)
• release_compressed_write_waiter(9)
• finish_compressed_write(9)
• add_to_bin(9)
• remove_from_bin(9)
• initialize_compressed_block(9)
• pack_fragment(9)
• compressed_write_end_io(9)
• write_bin(9)
• add_data_vio_to_packer_bin(9)
• select_bin(9)
• vdo_attempt_packing(9)
• check_for_drain_complete(9)
• write_all_non_empty_bins(9)
• vdo_flush_packer(9)
• vdo_remove_lock_holder_from_packer(9)
• vdo_increment_packer_flush_generation(9)
• vdo_resume_packer(9)
• vdo_dump_packer(9)

like, that's the entire group chat right there. 💜

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and that's the page!! mwah 💋

cute little sign-off for the record: this one comes from ./drivers/md/dm-vdo, dated October 2026, and you were reading vdo_drain_packer(9) the whole time. slay. 🎀✨