start_unlocking(9)

💅 start_unlocking(9) — from the Kernel API Manual 🎀

okay bestie, welcome to the group chat for start_unlocking — a whole function page straight outta the Kernel API Manual and honestly it's giving "tiny function, huge lore" ✨

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🌸 NAME 🌸

start_unlocking — releases a read lock on the PBN of the block that may or may not have contained duplicate data 🙈💀

no cap, "may or may not have" is doing SO much heavy lifting there but that's literally what it does, so we're keeping it fr fr.

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✨ SYNOPSIS ✨

void start_unlocking (struct hash_lock *lock , struct data_vio *agent );

that's it. that's the whole signature. void, so it doesn't hand anything back — it just does the thing and leaves 💅

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🦋 ARGUMENTS 🦋

• lock — the hash lock, aka the main character of this whole situation 👑
• agent — the data_vio that's currently acting as the agent for the lock 🫶 (yes, they get a whole title, we love a designated representative)

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🔥 SEE ALSO 🔥

buckle up bestie, the friend group is HUGE — these are all in Kernel file ./drivers/md/dm-vdo/dedupe.c and they're all (9) section pages so you know they're serious:

• Introduction(9)
• return_hash_lock_to_pool(9)
• vdo_get_duplicate_lock(9)
• hash_lock_key(9)
• get_hash_lock_state_name(9)
• assert_hash_lock_agent(9)
• set_duplicate_lock(9)
• dequeue_lock_waiter(9)
• set_hash_lock(9)
• exit_hash_lock(9)
• set_duplicate_location(9)
• retire_lock_agent(9)
• wait_on_hash_lock(9)
• abort_waiter(9)
• start_bypassing(9)
• finish_unlocking(9)
• unlock_duplicate_pbn(9)
• finish_updating(9)
• start_updating(9)
• finish_deduping(9)
• acquire_lock(9)
• enter_forked_lock(9)
• fork_hash_lock(9)
• launch_dedupe(9)
• start_deduping(9)
• increment_stat(9)
• finish_verifying(9)
• start_verifying(9)
• finish_locking(9)
• lock_duplicate_pbn(9)
• start_locking(9)
• finish_writing(9)
• select_writing_agent(9)
• start_writing(9)
• finish_querying(9)
• start_querying(9)
• report_bogus_lock_state(9)
• vdo_continue_hash_lock(9)
• is_hash_collision(9)
• vdo_acquire_hash_lock(9)
• vdo_release_hash_lock(9)
• transfer_allocation_lock(9)
• vdo_share_compressed_write_lock(9)
• report_dedupe_timeouts(9)
• finish_index_operation(9)
• check_for_drain_complete(9)
• vdo_make_hash_zones(9)
• vdo_free_hash_zones(9)
• suspend_index(9)
• resume_index(9)
• vdo_resume_hash_zones(9)
• get_hash_zone_statistics(9)
• vdo_get_dedupe_statistics(9)
• vdo_select_hash_zone(9)
• dump_hash_lock(9)
• dump_hash_zone(9)
• vdo_dump_hash_zones(9)
• acquire_context(9)

like I said. HUGE. the way this one little unlock function is connected to literally everyone 😭 iykyk.

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mwah 💖 that's the whole page! this one lives at ./drivers/md/dm-vdo and it's dated October 2026, page name start_unlocking(9) — go forth and unlock those PBNs responsibly, bestie 🧚⭐