ubi_eba_read_leb(9)

📦 version 7.3.1, in nixpkgs unstable

💜 ubi_eba_read_leb(9) 💜

okay so bestie, welcome to the Kernel API Manual entry for ubi_eba_read_leb — yes that's the whole title, yes it's a mouthful, no we're not renaming it, it's iconic as is 🎀

✨ NAME ✨

ubi_eba_read_leb — the function that reads data. that's it. that's the vibe. 📖

🌸 SYNOPSIS 🌸

int ubi_eba_read_leb (struct ubi_device *ubi , struct ubi_volume *vol ,
int lnum , void *buf , int offset , int len , int check );

like, look at all those arguments. seven of them. she's high maintenance and we love her for it 💅

🦋 ARGUMENTS 🦋

  • ubi — the UBI device description object, aka the main character of the whole device situation 👑
  • vol — the volume description object, the little world we're reading from 🪐
  • lnum — the logical eraseblock number, i.e. which block we're eyeing up 👀
  • buf — the buffer where the read data gets to live rent-free 🏠
  • offset — where in the block we start reading from, the starting line if you will 🎬
  • len — how many bytes we're reading. the length. the amount. the whole point 📏
  • check — the data CRC check flag, our little security guard 🛡️

🔥 DESCRIPTION 🔥

so here's the tea ☕ — if the logical eraseblock lnum is unmapped, then buf gets filled with 0xFF bytes. no cap, that's just what happens. it's giving "empty but make it 0xFF" 💀

the check flag only makes sense for static volumes — it forces eraseblock data CRC checking. for dynamic volumes it's just kinda... there. vibing. not doing much 🫶

now the return values, bestie, pay attention:

  • if everything goes great, this function returns zero. slay ✨
  • in the case of a static volume, if the data CRC mismatches, you get -EBADMSG back. rude, but fair 😭
  • -EBADMSG may also be returned for any volume type if an ECC error was detected by the MTD device driver. so don't assume it's always the static-volume thing, iykyk 🌈
  • other negative error codes may be returned in case of other errors. yes, "cored" is what the original says, we're keeping it, it's camp 💀
ngl bestie, always check your return value. zero is the dream, negatives are the reality check 🎀

⭐ SEE ALSO ⭐

okay this list is LONG and we're listing every single one of them because I would never do you dirty like that 💖

like, that's the whole squad. go read them too, they're all part of the same friend group 🧚

and that's the page, bestie! 💜 this lil masterpiece lives in ./drivers/mtd/ubi and it's dated October 2026 — so like, future vibes fr fr. mwah, go read some eraseblocks responsibly 🍓✨🫶

📦 where this page comes from