allocate_block(9)

💅 allocate_block(9) — like, the whole vibe

okay so real talk, bestie — you just opened the Kernel API Manual page for allocate_block(9), and honestly? It's a short one. Which, lowkey, is a slay. Let's get into it 🎀

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✨ NAME ✨

allocate_block — the function that attempts to allocate a block in the current allocation zone. That's it, that's the whole gig. She tries. 💅 (Note the word "attempt" — that's doing a lot of heavy lifting, iykyk.)

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🌸 SYNOPSIS 🌸

void allocate_block (struct vdo_completion *completion );

Periodt. That's the signature. Returns nothing (void), takes one thing, and that one thing is doing all the work.

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🦋 ARGUMENTS 🦋

• completion — the data_vio. Yeah, that's genuinely all the manpage says about it. Short king behavior, but okay. 👑

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💖 DESCRIPTION 💖

So here's the tea: this callback gets registered in continue_write_with_block_map_slot. That's the lore. That's where she enters the chat.

nobody explain to me why the entire description is one sentence, I'm choosing to be obsessed with the mystery 💀

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🔥 SEE ALSO 🔥

Bestie. Grab a snack, because this list is long. The manpage authors really said "let's link literally everything." Not me being impressed. 🫶

• 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)
• read_block(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)
• handle_allocation_error(9)
• continue_data_vio_with_block_map_slot(9)

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✨ and that's the whole page, diva ✨

cute little sign-off for the credits stans: this one lives under ./drivers/md/dm-vdo, dated October 2026, and answers to the name allocate_block(9). mwah 💋 — go read continue_data_vio_with_block_map_slot(9) next, bestie, it's basically the sequel 🌈💜