data_vio_all...e_data_block(9)

🌸 NAME 🌸

data_vio_allocate_data_block — allocate a data block. Okay bestie, this one is straight out of the Kernel API Manual, and it’s giving “small function, very important job” energy 💅✨

✨ SYNOPSIS ✨

void data_vio_allocate_data_block (struct data_vio *data_vio , enum
pbn_lock_type write_lock_type , vdo_action_fn callback , vdo_action_fn
error_handler );

🎀 ARGUMENTS 🎀

• data_vio — the data_vio. Like, the actual one we’re working with here 🫶
• write_lock_type — the type of write lock to obtain on the block. So it’s specifying which write-lock situation we’re getting into 🔒
• callback — the callback which will attempt an allocation in the current zone and continue if it succeeds. It’s the “try it in this zone, keep moving if it works” callback ✨
• error_handler — the handler for errors while allocating. The “if this goes sideways, call this” bestie 😭

🔥 SEE ALSO 🔥

Okay, the whole cross-reference squad is here — don’t skip a single one, bestie:

• 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)
• 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)
• 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)

That’s a wrap, bestie! Source/version: ./drivers/md/dm-vdo · date: October 2026 · page: data_vio_all...e_data_block(9). Go forth and allocate 💅✨🦋