nilfs_ioctl_do_get_vinfo(9)

📦 version 7.3.1, in nixpkgs unstable

👑 nilfs_ioctl_do_get_vinfo — the Kernel API Manual, bestie edition ✨

Okay so this page is nilfs_ioctl_do_get_vinfo(9) from the Kernel API Manual, and it's literally the callback that fetches your virtual block info. Tiny function, big group-chat energy. Let's get into it 💅

✨ NAME ✨

nilfs_ioctl_do_get_vinfo — the callback method that gets virtual blocks info 🦋

🌸 SYNOPSIS 🌸

ssize_t nilfs_ioctl_do_get_vinfo (struct the_nilfs *nilfs , __u64 *posp
, int flags , void *buf , size_t size , size_t nmembs );

That's the whole signature, no cap. Six arguments, one return type, all of it exact 🎀

💖 ARGUMENTS 💖

  • nilfs — the nilfs object, obvs. This is your main character right here 👑
  • posp — not used 🙈 literally just vibing there, ignored
  • flags — not used too 😭 also ignored, don't even worry about it
  • buf — the buffer where the array of nilfs_vinfo structures gets stored 🍓
  • size — size in bytes of one vinfo item in the array, so like, the per-item footprint ngl
  • nmembs — the count of vinfos in the array. how many we're working with, fr fr

🔥 DESCRIPTION 🔥

So the nilfs_ioctl_do_get_vinfo function returns information on virtual block addresses ✨ That's the whole gig and it ate.

The NILFS_IOCTL_GET_VINFO ioctl is the one that gets used by the nilfs_cleanerd daemon — so if you were wondering who's calling this, it's them, iykyk 🧚

🌈 RETURN 🌈

On success? It hands you back the count of nilfs_vinfo structures in the output buffer 💖 On failure? A negative error code 😭 that's the vibe check failing, respectfully.

🦋 SEE ALSO 🦋

Kernel file ./fs/nilfs2/ioctl.c, plus the whole friend group:

Okay that's the whole page bestie, go read the source if you want more lore 📚

Sign-off time 🫶 this little masterpiece lives in ./fs/nilfs2, it's dated October 2026, and it's filed under nilfs_ioctl_do_get_vinfo(9). Slay, periodt 💅✨

📦 where this page comes from