ubi_io_write_vid_hdr(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ubi_io_write_vid_hdr(9) — like, the Kernel API Manual, but make it make sense

okay so bestie, welcome to the ubi_io_write_vid_hdr(9) page from the Kernel API Manual ✨ this is the one where we write a volume identifier header, and honestly? it's giving "small function, big responsibilities" 🎀

🌸 NAME 🌸

ubi_io_write_vid_hdr — write a volume identifier header. that's it, that's the whole vibe 💖

✨ SYNOPSIS ✨

int ubi_io_write_vid_hdr (struct ubi_device *ubi , int pnum , struct
ubi_vid_io_buf *vidb );

like, three args, one int back. classic. iykyk 🦋

🫶 ARGUMENTS 🫶

  • ubi — the UBI device description object, aka the main character 👑 this is your device, your whole context, everything flows through here.
  • pnum — the physical eraseblock number you're writing to. yes, that exact one. no cap 📍
  • vidb — the volume identifier buffer that's getting written. this is the payload bestie, treat it with respect 💜

🔥 DESCRIPTION 🔥

so this function writes the volume identifier header described by vid_hdr to physical eraseblock pnum. literally its whole job, and it ate 💅

but wait, there's more — it's also lowkey doing some housekeeping for you:

  • it automatically fills the vidb->hdr->magic field ✨
  • it automatically fills the vidb->hdr->version field ✨
  • it calculates the header CRC checksum and stores it at vidb->hdr->hdr_crc 🔒

so you don't gotta do any of that yourself, which is honestly such a slay.

This function returns zero in case of success and a negative error code in case of failure. and ngl, if -EIO is returned, that physical eraseblock probably went bad 😭 like it's cooked, fr fr.

⚠️ heads up bestie: -EIO is your bad-block red flag. don't ignore it, okay? it's not a vibe.

🦋 SEE ALSO 🦋

the whole friend group, no one left out 🫶:

and that's the page!! 🎀 this icon lives in ./drivers/mtd/ubi, dated October 2026, and it's filed under ubi_io_write_vid_hdr(9) — go write those headers bestie, you got this 💖🌈⭐

📦 where this page comes from