vdo_get_com...ock_fragment(9)

💅 vdo_get_com...ock_fragment(9) — like, the Kernel API Manual page, bestie ✨

okay so this is one of those Kernel API Manual pages 🎀 and honestly? it's short, it's sweet, and it's gonna make sense in like two minutes fr fr. let's go 🦋

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✨ NAME ✨

vdo_get_compressed_block_fragment — get a reference to a compressed fragment from a compressed block 💖

🌸 SYNOPSIS 🌸

int vdo_get_compressed_block_fragment (enum block_mapping_state
mapping_state , struct compressed_block *block , u16 *fragment_offset ,
u16 *fragment_size );

like yes the spacing is a little quirky, that's just how it is, don't come for me 🙈

🫶 ARGUMENTS 🫶

• mapping_state — the mapping state that's describing the fragment, iykyk 👑
• block — the compressed block that was read from disk. it came from disk, bestie, respect it 💀
• fragment_offset — the offset of the fragment within the compressed block 📍
• fragment_size — and this one's the size of the fragment, periodt ✨

💜 RETURN 💜

if a valid compressed fragment is found, you get VDO_SUCCESS 🎉 slay.

otherwise you get VDO_INVALID_FRAGMENT if the fragment is invalid 😭 — so, y'know, vibe check the return value, please 🌈

🔥 SEE ALSO 🔥

okay this is the part where it goes full group-chat-tag-everyone energy 🌸 — the Kernel file ./drivers/md/dm-vdo/packer.c and honestly a whole cast:

• assert_on_packer_thread(9)
• insert_in_sorted_list(9)
• make_bin(9)
• vdo_make_packer(9)
• vdo_free_packer(9)
• get_packer_from_data_vio(9)
• vdo_get_packer_statistics(9)
• abort_packing(9)
• release_compressed_write_waiter(9)
• finish_compressed_write(9)
• add_to_bin(9)
• remove_from_bin(9)
• initialize_compressed_block(9)
• pack_fragment(9)
• compressed_write_end_io(9)
• write_bin(9)
• add_data_vio_to_packer_bin(9)
• select_bin(9)
• vdo_attempt_packing(9)
• check_for_drain_complete(9)
• write_all_non_empty_bins(9)
• vdo_flush_packer(9)
• vdo_remove_lock_holder_from_packer(9)
• vdo_increment_packer_flush_generation(9)
• vdo_drain_packer(9)
• vdo_resume_packer(9)
• vdo_dump_packer(9)

like, that's the whole packer friend group, no cap 💅

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ok and finally the cute lil sign-off: this one lives in ./drivers/md/dm-vdo, dated October 2026, and it's page vdo_get_com...ock_fragment(9) of the Kernel API Manual 🎀 mwah, go read your man pages bestie 💖🦋