read_block(9)

read_block(9) — Kernel API Manual 🫶

okay bestie, welcome to the <hotpink>read_block(9)</hotpink> page from the Kernel API Manual. it's short, it's sweet, it's giving "callback with main character energy," and we are keeping every single crumb. ✨

🌸 NAME 🌸

read_block — read a block asynchronously. literally what it says on the tin, and yes, that is the whole name section. periodt. 💅

✨ SYNOPSIS ✨

void read_block (struct vdo_completion *completion );

🎀 ARGUMENTS 🎀

• completion — the data_vio doing the read. that's the argument, bestie — it's carrying the read vibe. 🦋

🦋 DESCRIPTION 🦋

okay so this function is literally the callback registered in read_block_mapping. that's the tea. the page does not expand further, so we are not gonna invent lore — the callback registration is the whole moment. iconic, honestly. 😭

👑 SEE ALSO 👑

these are the linked files and pages, all present and accounted for, no cap:

• 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)
• 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)

mwah 💋 this page's source/version is ./drivers/md/dm-vdo, dated October 2026, and the page is read_block(9). slay and goodbye. 🎀