mtree_store(9)

💅 mtree_store — store an entry at a given index, bestie ✨

okay so this is a page from the Kernel API Manual (section 9, the kernel-functions girlies 🌸), and it's literally about dropping one single entry into a maple tree at a specific index. short page, but she matters. let's get into it 🫶

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✨ SYNOPSIS ✨

int mtree_store (struct maple_tree *mt , unsigned long index , void
*entry , gfp_t gfp );

that's the whole vibe: returns an int, takes four things. slay. 💅

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🎀 ARGUMENTS 🎀

• mt — the maple tree 🌳 like, the actual struct maple_tree you're messing with. main character energy fr.
• index — the index where the value goes. this is where the thing lives, bestie, choose wisely ✨
• entry — the entry you're storing. the payload. the moment. 👑
• gfp — the GFP_FLAGS used for allocations 🧚 if you don't know what those are, that's a whole other manpage, iykyk.

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💖 RETURN 💖

• 0 — on success 🎉 slay, it worked, we love a zero.
• -EINVAL — on an invalid request 🙈 not me passing something the tree can't handle.
• -ENOMEM — if memory could not be allocated 💀 the allocator said no and honestly same.

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🦋 SEE ALSO 🦋

Kernel file ./lib/maple_tree.c 🍓 and like... her entire extended friend group:

• mas_prealloc_calc(9)
• mas_wr_preallocate(9)
• mas_insert(9)
• mas_alloc_cyclic(9)
• mas_walk(9)
• mte_dead_walk(9)
• mt_free_walk(9)
• mas_store(9)
• mas_store_gfp(9)
• mas_store_prealloc(9)
• mas_preallocate(9)
• mas_next(9)
• mas_next_range(9)
• mt_next(9)
• mas_prev(9)
• mas_prev_range(9)
• mt_prev(9)
• mas_pause(9)
• mas_find_setup(9)
• mas_find(9)
• mas_find_range(9)
• mas_find_rev_setup(9)
• mas_find_rev(9)
• mas_find_range_rev(9)
• mas_erase(9)
• mas_nomem(9)
• mas_nomem_nofail(9)
• mtree_load(9)
• mtree_store_range(9)
• mtree_insert_range(9)
• mtree_insert(9)
• mtree_alloc_cyclic(9)
• mtree_erase(9)
• __mt_dup(9)
• mtree_dup(9)
• __mt_destroy(9)
• mtree_destroy(9)
• mt_find(9)
• mt_find_after(9)

like, that's the whole group chat right there 😭 go read them, they're iconic, periodt. 💜

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ngl the whole node lives in ./lib, and it's dated October 2026 ⭐ so if you're reading this from the future: hi bestie, hope the maple tree is thriving 🌈

stay hydrated, preallocate responsibly, and remember: every entry deserves its own index 🎀💖✨