vdo_request_page_write(9)

💖 vdo_request_page_write(9) 💖

ok so bestie, welcome to the Kernel API Manual — yes that's the manual name, we're fancy here — and today's main character is vdo_request_page_write(9). pull up a chair, grab a boba, we're learning kernel internals 🧚✨

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🌸 NAME 🌸

vdo_request_page_write — literally just: request that a VDO page be written out as soon as it's not busy anymore. that's it. that's the whole vibe. no cap 🫶

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✨ SYNOPSIS ✨

void vdo_request_page_write (struct vdo_completion *completion );

look at her go. void return, one arg, she's lowkey iconic for that 💅

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🎀 ARGUMENTS 🎀

• completion — the vdo_page_completion containing the page. that's the one and only thing you gotta hand over, bestie. it's giving "just one lil parameter" energy and we respect it 🙈

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🦋 SEE ALSO 🦋

okay this is the part where the page goes full group-chat-tag-everyone mode 💀 the kernel file in question is ./drivers/md/dm-vdo/block-map.c, and here's the entire squad, no one left out, 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_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)

that's fifty. fifty besties. i counted so you don't have to 😭🔥

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and that's the whole page, gorgeous 🌈 — brought to you from ./drivers/md/dm-vdo, dated October 2026, and living under the vdo_request_page_write(9) header forever and ever. mwah, go read some more kernel docs, you ate that 💜👑