btree_lookup(9)

💖 btree_lookup(9) 💖

okay so real talk, this is a page straight out of the Kernel API Manual — yes, kernel land, yes, it's giving big-brain energy, and yes, you're gonna slay it.

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✨ NAME ✨

btree_lookup — look up a key in the btree 🔍

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✨ SYNOPSIS ✨

void * btree_lookup (struct btree_head *head , struct btree_geo *geo ,
unsigned long *key );

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✨ ARGUMENTS ✨

• head — the btree you're looking in, bestie. like, the actual tree. the main character. 🌳
• geo — the btree geometry 🦋 (yes it's a real parameter, no we don't question it)
• key — the key to look up 👑 the whole reason we're here

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✨ DESCRIPTION ✨

so this function? it returns the value for the given key. that's it. that's the whole vibe. 🫶

and if the key isn't there? you get NULL. no value, no drama, just NULL. periodt. 💅

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✨ SEE ALSO ✨

Kernel file ./include/linux/btree.h — go read it, iykyk 📖

• B+Tree basics(9)
• struct btree_head(9)
• btree_alloc(9)
• btree_free(9)
• btree_init_mempool(9)
• btree_init(9)
• btree_destroy(9)
• btree_insert(9)
• btree_update(9)
• btree_remove(9)
• btree_merge(9)
• btree_last(9)
• btree_get_prev(9)

like literally the whole btree friend group, obsessed 🌈✨

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mwah 💋 this one lives in ./include/linux, it's the October 2026 edition, and it's page btree_lookup(9) — go forth and look up those keys, bestie 🎀🔥