allocate_cache_components(9)

💅 allocate_cache_components(9) — okay bestie, let's talk Kernel API Manual

So like… this is a page from the Kernel API Manual (yes, the allocate_cache_components(9) one, we're literally here) and it's about setting up the pieces of a cache that need their own little allocation moment. Main character energy for a function, honestly.

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✨ NAME ✨

allocate_cache_components — allocates the components of the cache that require their own separate allocation. Like, they can't just piggyback on somebody else's memory, they need their own space. Respect.

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🌸 SYNOPSIS 🌸

int allocate_cache_components (struct vdo_page_cache *cache );

That's it. That's the whole vibe. One function, one argument, one int coming back at you. 🎀

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🦋 ARGUMENTS 🦋

• cache — the page cache. That's the one. The whole thing you're allocating components for.

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🔥 DESCRIPTION 🔥

Okay so the actual description is short and honestly kind of iconic in its brevity:

The caller is responsible for all clean up on errors.

That's it. That's the whole thing. If something goes wrong in here, guess who's picking up the mess? Not this function. It's you, bestie. You are the designated cleanup crew. No cap — the caller owns every error path, so don't come crying to allocate_cache_components when you've got orphaned allocations lying around. 🙈

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⭐ RETURN ⭐

• VDO_SUCCESS — slay, we did it, everything's allocated. 👑
• or an error code — not slay, but at least you know. And remember the description up there: the cleanup is still your problem. 💀

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🌈 SEE ALSO 🌈

This list is long, and honestly it's giving "who's who of the dm-vdo block map universe." Every single one of these, right here, no skipping:

Kernel file ./drivers/md/dm-vdo/block-map.c

• Block map eras(9)
• initialize_info(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)
• launch_cursor(9)
• compute_boundary(9)
• vdo_traverse_forest(9)
• initialize_block_map_zone(9)
• clear_mapped_location(9)
• set_mapped_location(9)

Read them. All of them. Iykyk. 🫶

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And that's the whole page, bestie — no more lore to spill. This lil' gem lives in ./drivers/md/dm-vdo and it's stamped October 2026, so like… future vibes only. Stay allocated, and remember: clean up your errors. 💜✨🎀