ldm_get_disk_objid(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ldm_get_disk_objid — the ldm_get_disk_objid(9) glow-up

okay so real talk, this one lives in the Kernel API Manual, and it's a little function with a big job: it goes digging through a linked list of vblk's to find a given Disk Id. bestie, it's giving "detective with a flashlight in a server room" energy and honestly? iconic. 🔦✨

🌸 NAME 🌸

ldm_get_disk_objid — Search a linked list of vblk's for a given Disk Id

like, that's literally the whole assignment. find the disk id. slay. 💅

✨ SYNOPSIS ✨

struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb );

one function, one pointer in, one pointer out. no drama, no cap. 🫶

🎀 ARGUMENTS 🎀

  • ldb — Cache of the database structures ✨ this is the stash, the little wardrobe of db structs you're gonna rummage through, iykyk.

🦋 DESCRIPTION 🦋

okay so picture this: the LDM Database contains a list of all partitions on all dynamic disks. like, all of them. every single one. 😭

The primary PRIVHEAD, sitting right at the beginning of the physical disk, tells us the GUID of this disk. that's the little name tag the disk wears at the party. 🎀

So this function? it searches for the GUID in a linked list of vblk's. that's it. that's the vibe check. it walks the list, looking for the one that matches. main character energy, one job, does it well. 👑

⭐ RETURN ⭐

  • Pointer — A matching vblk was found 🎉 periodt, we found it
  • NULL — No match, or an error 💀 so either it's not there, or something went sideways
ngl, NULL is doing double duty here — no match and error both land on NULL, so don't go assuming it's always "just not found," bestie. 🙈

🌈 SEE ALSO 🌈

Kernel file ./block/partitions/ldm.c — and the whole friend group, fr fr:

like, that's the entire group chat and every single one of them ate. 🔥👑

anyway that's the whole page, bestie 🧚 — this little icon came from the source tree at ./block/partitions and it's stamped October 2026, so go forth and find those disk ids. mwah. 💖🎀🦋

📦 where this page comes from