vdo_flush_packer(9)

💅 vdo_flush_packer — like, the kernel API manual bestie edition ✨

okay so real talk, this is the page for vdo_flush_packer(9) — yes the (9) means it's a kernel API thang, we love a section-nine moment 🎀

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🌸 NAME 🌸

vdo_flush_packer — request that the packer flush asynchronously. that's it, that's the whole vibe. no cap 💖

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✨ SYNOPSIS ✨

void vdo_flush_packer (struct packer *packer );

literally just one call, one pointer, zero drama 🦋

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🫶 ARGUMENTS 🫶

• packer — the packer to flush. like, this one. the one you're handing over. the main character of the operation 👑

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💅 DESCRIPTION 💅

okay so here's what actually goes down, and it's lowkey kind of elegant:

every bin that's holding at least two compressed data blocks will be written out. periodt. 🗂️✨ and any solitary pending VIOs — the lonely little single ones, bless them 😭 — get released from the packer. no binning, no waiting, they're free to go 🕊️

meanwhile, while the flushing is in progress, any VIOs that get submitted to vdo_attempt_packing will be continued immediately, without even trying to pack them. like, don't even bother asking rn, the packer is busy, we're not packing, we're flushing, read the room 💀

⚠️ and yes, that's real behaviour and not a glitch — during a flush, packing attempts get skipped on purpose. just so we're clear, bestie 🫶

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👀 SEE ALSO 👀

the kernel file itself, aka the source of truth:

• ./drivers/md/dm-vdo/packer.c

and the whole friend group 🫂 (all of these are (9) pages, keep up):

• 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_remove_lock_holder_from_packer(9)
• vdo_increment_packer_flush_generation(9)
• vdo_drain_packer(9)
• vdo_resume_packer(9)
• vdo_dump_packer(9)

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✧･ﾟ and that's the page!! ･ﾟ✧ this lil gem lives in ./drivers/md/dm-vdo, it's dated October 2026, and the whole thing is filed under vdo_flush_packer(9). go forth and flush asynchronously, bestie — ily, mwah 💖🎀🦋