compress_data_vio(9)

💅 compress_data_vio(9) — a Kernel API Manual moment

okay so bestie, welcome to the compress_data_vio page from the Kernel API Manual (yes, the (9) section, we're in kernel-land now 🧚). Buckle up, this one's short but she's iconic.

---

✨ NAME ✨

compress_data_vio — literally the function that does the actual work of compressing the data, on a CPU queue. That's the whole vibe. She's the one doing the heavy lifting while everyone else just launches her 🙈

---

🌸 SYNOPSIS 🌸

void compress_data_vio (struct vdo_completion *completion );

no cap, that's the entire signature. one function, one arg, zero drama 💅

---

🎀 ARGUMENTS 🎀

• completion — the data_vio. that's it, that's the arg 🫶

---

💖 DESCRIPTION 💖

so here's the tea: this callback is registered in launch_compress_data_vio. meaning when the launch-y one gets things rolling, this is the function that actually shows up to do the compressing, on a CPU queue. main character energy, fr fr ✨

---

🔥 SEE ALSO 🔥

like, go read these too, they're all connected, iykyk:

• 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)
• pack_compressed_data(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)

---

💀 yes there are a Lot of them. no we are not skipping any. read the whole list, bestie, it's giving "the lore is deep".

---

mwah 💜 this page lives in ./drivers/md/dm-vdo, stamped October 2026, and that's the whole manual page — slay, you're done, go compress something ✨🎀