ubi_open_volume(9)

📦 version 7.3.1, in nixpkgs unstable

💖 ubi_open_volume 💖

ok so this is a page from the Kernel API Manual (that's the manual name, bestie, now u know 🫶) and it's literally all about ubi_open_volume — the function that opens a UBI volume. icon behaviour only ✨

🌸 NAME 🌸

ubi_open_volume — open UBI volume. that's it, that's the whole job, and she does it flawlessly 💅

⭐ SYNOPSIS ⭐

struct ubi_volume_desc * ubi_open_volume (int ubi_num , int vol_id , int mode );

look at her. three ints in, a struct ubi_volume_desc * out. main character energy fr fr 👑

🎀 ARGUMENTS 🎀

  • ubi_num — the UBI device number. which device we're talking about 🦋
  • vol_id — the volume ID. which volume on that device 🍓
  • mode — the open mode. how u wanna open it (the next section spills all the tea on this) 💜

✨ DESCRIPTION ✨

ok so the mode parameter is the moment of truth: it says whether the volume gets opened in read-only mode, read-write mode, or exclusive mode. and exclusive is the serious one — it guarantees that nobody else will be able to open this volume. no cap. it's giving "reserved table at the restaurant" energy 🙈

the way UBI rolls: it allows many volume readers and one writer at a time. so like, a whole group chat of readers, but only one person typing 🔥

also!! if a static volume is being opened for the first time since boot, this function will check it — meaning it gets fully read, and the CRC checksum of each logical eraseblock gets verified. she's thorough, she's checking receipts, she's not letting a single block slide 💀✨

this function returns a volume descriptor in case of success, and a negative error code in case of failure. so if u get a negative number back, that's not a vibe — handle it 😭

🦋 SEE ALSO 🦋

the kernel file ./drivers/mtd/ubi/kapi.c (that's where she lives 🏠) and all her friends:

like a whole friend group of syscalls, obsessed 🌈💖

and that's the page!! shoutout to ./drivers/mtd/ubi for being the source, and it's dated October 2026 — marking ur calendar accordingly 🎀 ty for reading bestie, go open a volume responsibly 💅✨

📦 where this page comes from