set_duplicate_lock(9)

💖 NAME 💖

okay bestie, this is set_duplicate_lock(9) from the Kernel API Manual — and yes, it’s giving very specific lock-update energy. This function sets the duplicate lock held by a hash lock. The big rule: it may only be called in the physical zone of the PBN lock. That’s not a vibe suggestion, it’s a hard constraint. Periodt. 💅

🚨 Caveat bestie: may only be called in the physical zone of the PBN lock. Do not freestyle this one.

✨ SYNOPSIS ✨

Copy it exactly, no autocorrect, no creative renaming:

void set_duplicate_lock (struct hash_lock *hash_lock , struct pbn_lock *pbn_lock );

🎀 ARGUMENTS 🎀

Two arguments, both iconic, neither optional:

• hash_lock — the hash lock to update. This is the lock getting the update, okay?
• pbn_lock — the PBN read lock to use as the duplicate lock. It’s literally the read lock stepping into the duplicate-lock role.

🌸 SEE ALSO 🌸

The whole crew, exactly as named — no skipping the friend group:

• Kernel file ./drivers/md/dm-vdo/dedupe.c
• 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)
• 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)
• start_unlocking(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)

signed, sealed, and slaying from ./drivers/md/dm-vdo — October 2026, set_duplicate_lock(9) 💖✨🫶