clean_fn(9)

✨ NAME ✨

okay so bestie, this is clean_fn(9) from the Kernel API Manual, and she is literally here to remove invalid keys from the cache tree 💅

clean_fn — cleanup function to remove invalid keys from the cache tree. That's the whole name, no cap.

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🌸 SYNOPSIS 🌸

void clean_fn (struct work_struct *work );

literally the whole signature. iconic.

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🎀 ARGUMENTS 🎀

• work — pointer to the work_struct associated with the cleanup. that's the one thing she takes, periodt.

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💅 DESCRIPTION 💅

so here's the vibe: clean_fn cleans up invalid keys from the cache tree in the background, after a cache segment has been invalidated during cache garbage collection 🧚✨

she processes a maximum of PCACHE_CLEAN_KEYS_MAX keys per iteration, and yes, she holds the tree lock to ensure thread safety — lock held, chaos managed, no cap 🔥

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🦋 SEE ALSO 🦋

the kernel file is ./drivers/md/dm-pcache/cache_key.c, and these are the besties in the neighborhood:

• cache_key_get(9)
• cache_key_destroy(9)
• cache_key_append(9)
• cache_subtree_walk(9)
• cache_subtree_search(9)
• fixup_overlap_tail(9)
• fixup_overlap_contain(9)
• fixup_overlap_contained(9)
• fixup_overlap_head(9)
• cache_key_insert(9)

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mwah 💋 this page comes from ./drivers/md/dm-pcache, dated October 2026, and you can call her clean_fn(9) 💖