pack_compressed_data(9)

💖 pack_compressed_data — a Kernel API moment 💖

okay so bestie, welcome to the pack_compressed_data(9) page — it's a kernel API manual, it lives in the pack_compressed_data(9) section, and it is short but it is iconic. let's get into it 🫶

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✨ NAME ✨

pack_compressed_data — the function that tries to pack that compressed data_vio into a block. like, it attempts it. no cap, "attempt" is the whole vibe here 💅

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🌸 SYNOPSIS 🌸

void pack_compressed_data (struct vdo_completion *completion );

that's the whole signature, and yes it returns void — no return value, no drama, it just does the thing ✨

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🎀 ARGUMENTS 🎀

• completion — the data_vio. that's it. that's the whole description. she's a struct vdo_completion * and she's the data_vio, periodt 👑

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🦋 DESCRIPTION 🦋

okay so the tea: this is the callback that gets registered in launch_compress_data_vio. that's literally the entire description and honestly? it ate. main character callback energy fr fr 🌈

so when launch_compress_data_vio does its whole thing, this is the function that gets called back. it shows up, it tries to pack the compressed data_vio into a block, it's giving "i was invited, i'm doing my job" 😭💖

lowkey reminder: the manpage says attempt to pack — so don't go around assuming it always succeeds, bestie 🙈

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⭐ SEE ALSO ⭐

bestie there are SO many references here, buckle up, we're going on a journey 🧚‍♀️✨

• the kernel file ./drivers/md/dm-vdo/data-vio.c
• Bio flags.(9)
• Introduction(9)
• check_for_drain_complete_locked(9)
• pack_status(9)
• set_data_vio_compression_status(9)
• cancel_data_vio_compression(9)
• attempt_logical_block_lock(9)
• launch_data_vio(9)
• schedule_releases(9)
• process_release_callback(9)
• initialize_data_vio(9)
• make_data_vio_pool(9)
• free_data_vio_pool(9)
• vdo_launch_bio(9)
• drain_data_vio_pool(9)
• resume_data_vio_pool(9)
• dump_data_vio_pool(9)
• release_allocated_lock(9)
• release_logical_lock(9)
• finish_cleanup(9)
• get_data_vio_operation_name(9)
• data_vio_allocate_data_block(9)
• release_data_vio_allocation_lock(9)
• uncompress_data_vio(9)
• modify_for_partial_write(9)
• read_block(9)
• update_block_map(9)
• read_old_block_mapping(9)
• compress_data_vio(9)
• launch_compress_data_vio(9)
• hash_data_vio(9)
• write_bio_finished(9)
• acknowledge_write_callback(9)
• allocate_block(9)
• handle_allocation_error(9)
• continue_data_vio_with_block_map_slot(9)

like, that's the whole friend group and every single one of them gets a (9). we love a consistent squad 💜

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and that's the page!! mwah 💋 this lil writeup lives in ./drivers/md/dm-vdo, dated October 2026, and it's filed under pack_compressed_data(9) — go off, kernel docs, you absolute icons 👑🎀🔥