launch_cursor(9)

🎀 launch_cursor — Kernel API Manual, group-chat edition 💅✨

💖 NAME 💖

launch_cursor — start traversing a single block map tree now that the cursor has a VIO with which to load pages. That's the whole vibe, bestie. 🦋

✨ SYNOPSIS ✨

void launch_cursor (struct vdo_waiter *waiter , void *context );

🌸 ARGUMENTS 🌸

• waiter — the parent of the cursor to launch. That's the one we're hyping up. 🫶
• context — the pooled_vio just acquired. Freshly grabbed, main character energy. ✨

💅 DESCRIPTION 💅

This one implements waiter_callback_fn. Periodt. It's giving callback energy — that's literally the description, bestie, and we're not gonna pretend otherwise. 😭

🦋 SEE ALSO 🦋

Kernel file ./drivers/md/dm-vdo/block-map.c, plus all the Block map eras(9) crew. Obsessed with this friend group, fr fr:

• Block map eras(9)
• initialize_info(9)
• allocate_cache_components(9)
• assert_on_cache_thread(9)
• get_page_state_name(9)
• update_counter(9)
• set_info_state(9)
• find_free_page(9)
• find_page(9)
• select_lru_page(9)
• complete_with_page(9)
• complete_waiter_with_error(9)
• complete_waiter_with_page(9)
• distribute_page_over_waitq(9)
• set_persistent_error(9)
• validate_completed_page(9)
• handle_load_error(9)
• page_is_loaded(9)
• handle_rebuild_read_error(9)
• launch_page_load(9)
• schedule_page_save(9)
• launch_page_save(9)
• completion_needs_page(9)
• allocate_free_page(9)
• discard_a_page(9)
• discard_page_if_needed(9)
• write_has_finished(9)
• handle_page_write_error(9)
• page_is_written_out(9)
• write_pages(9)
• vdo_release_page_completion(9)
• vdo_get_page(9)
• vdo_request_page_write(9)
• vdo_get_cached_page(9)
• vdo_invalidate_page_cache(9)
• get_tree_page_by_index(9)
• in_cyclic_range(9)
• is_not_older(9)
• add_to_dirty_lists(9)
• vdo_find_block_map_slot(9)
• make_forest(9)
• replace_forest(9)
• finish_cursor(9)
• continue_traversal(9)
• finish_traversal_load(9)
• traverse(9)
• compute_boundary(9)
• vdo_traverse_forest(9)
• initialize_block_map_zone(9)
• clear_mapped_location(9)
• set_mapped_location(9)

Okay that's the whole page, bestie. This cutie lives in ./drivers/md/dm-vdo, and the date on it is October 2026. Mwah 💋✨