btree_remove(9)

💅 btree_remove(9) — a Kernel API Manual moment

okay so bestie, we're in the kernel API manual today, and this page is literally called btree_remove(9). it's short, it's sweet, and it does exactly one thing. let's get into it ✨

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🎀 NAME 🎀

btree_remove — remove an entry from the btree, bestie. that's the whole job. iconic, honestly.

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✨ SYNOPSIS ✨

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

look at her. void * return, three args, no notes. she ate 💅

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🌸 ARGUMENTS 🌸

• head — the btree you're updating. this is the main character of the whole operation 🫶
• geo — the btree geometry. yes queen, the layout info, she's coming with us.
• key — the key you want to remove. bye bye key 🔥

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💖 DESCRIPTION 💖

so here's the vibe check: this function returns the removed entry, or NULL if the key could not be found.

that's it. that's the function. no cap. if the key's there, you get the entry back in your hand; if it's not, you get NULL and you just have to deal with that 😭

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🦋 SEE ALSO 🦋

the kernel file in question is ./include/linux/btree.h, and here's the whole friend group — go say hi:

• 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_lookup(9)
• btree_insert(9)
• btree_update(9)
• btree_merge(9)
• btree_last(9)
• btree_get_prev(9)

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fr fr, if you're removing stuff and wondering why you got NULL back — the key wasn't there. that's the whole mystery solved, you're welcome 🔍💀

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okay that's the page!! this lil beauty lives in ./include/linux and she's dated October 2026 🌈⭐ so if you see her around, say hi for me. mwah, go remove some entries, bestie 💜🧚