discard_page_if_needed(9)

💖 NAME 💖

okay so bestie, welcome to the discard_page_if_needed(9) page from the Kernel API Manual ✨ This one is short and sweet: discard_page_if_needed is the helper used to trigger a discard if the cache needs another free page. That's literally the whole assignment, no cap 🫶

✨ SYNOPSIS ✨

void discard_page_if_needed (struct vdo_page_cache *cache );

🎀 ARGUMENTS 🎀

• cache — the page cache. that's it, that's the vibe 💅

🦋 SEE ALSO 🦋

Kernel file ./drivers/md/dm-vdo/block-map.c is right here in the mix, and the full SEE ALSO lineup is:

• 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)
• 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)
• launch_cursor(9)
• compute_boundary(9)
• vdo_traverse_forest(9)
• initialize_block_map_zone(9)
• clear_mapped_location(9)
• set_mapped_location(9)

mwah 💋 and that's the page — footer vibes for the record: source/version ./drivers/md/dm-vdo, date October 2026, and the title discard_page_if_needed(9). periodt 🌈