ltree_lookup(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ltree_lookup — the manual page, but make it make sense

okay so bestie, welcome to ltree_lookup(9), a Kernel API Manual moment. this is the lil function that peeks into the lock tree and tells you what's what. short page, but it matters, so let's go 🫶

✨ NAME ✨

ltree_lookup — look up the lock tree. that's it, that's the whole vibe. 🔥

✨ SYNOPSIS ✨

struct ubi_ltree_entry * ltree_lookup (struct ubi_device *ubi , int
vol_id , int lnum );

like the signature says — takes a device, a volume ID, and a logical eraseblock number, hands you back a pointer. iconic behavior honestly 💅

✨ ARGUMENTS ✨

  • ubi — the UBI device description object. this is your main character, the whole device you're poking at 👑
  • vol_id — the volume ID. which volume we're talking about, bestie 🎀
  • lnum — the logical eraseblock number. the specific block inside that volume 🌸

✨ DESCRIPTION ✨

so here's the tea ☕ — ltree_lookup returns a pointer to the corresponding struct ubi_ltree_entry object if the logical eraseblock is locked. and if it's not locked? you get NULL. no in-between, no "maybe", just pointer or NULL, periodt 💀

⚠️ real talk though: ubi->ltree_lock has to be locked before you call this. that's not a suggestion, that's the contract. don't be the person who forgets it 🙈

✨ SEE ALSO ✨

the Kernel file to go look at is ./drivers/mtd/ubi/eba.c — go read it, it's giving lore 📖

and here's the whole friend group, no cap:

and that's the page! 🦋 this lil cutie lives in ./drivers/mtd/ubi, it's dated October 2026, and yeah — we're calling it ltree_lookup(9). mwah, slay, go lock your ltree_lock 💖✨

📦 where this page comes from