nilfs_ioctl_set_suinfo(9)

📦 version 7.3.1, in nixpkgs unstable

✨ nilfs_ioctl_set_suinfo(9) ✨

okay so bestie, welcome to the Kernel API Manual 🎀 — this one's a little ioctl that goes and rewrites your segment usage info, and honestly she's giving very niche-but-important energy. let's get into it 💅

🌸 NAME 🌸

nilfs_ioctl_set_suinfo — set segment usage info ✨

like, she literally sets the segment usage info. that's the whole vibe. no cap.

🦋 SYNOPSIS 🦋

int nilfs_ioctl_set_suinfo (struct inode *inode , struct file *filp ,
       unsigned int cmd , void __user *argp );

💖 ARGUMENTS 💖

  • inode — the inode object, obviously. main character of the inode world 👑
  • filp — the file object. yes it's a file, yes it shows up, yes it matters 🫶
  • cmd — the ioctl's request code. this is the "what do you actually want from me" parameter 💫
  • argp — a pointer onto the argument coming from userspace. very "handing you a note from the other side" of her 🧚

⭐ DESCRIPTION ⭐

So here's the tea 🍓: this function expects an array of nilfs_suinfo_update structures encapsulated in nilfs_argv, and then it goes ahead and updates the segment usage info according to the flags in nilfs_suinfo_update. literally that's it, that's the whole job — takes your array, reads your flags, updates the suinfo. slay 🔥

💜 RETURN 💜

Returns 0 on success ✨ — or one of these negative error codes if things go sideways, and ngl some of these are giving "uh oh" 😭:

  • -EEXIST — Block conflict detected. like, the block was already taken, awkward 🙈
  • -EFAULT — Error copying input data. the copy just did not happen, bestie 💀
  • -EINVAL — Invalid values in input (segment number, flags or nblocks). one of those three was not it.
  • -EIO — I/O error. classic.
  • -ENOMEM — Insufficient memory available. she's hungry and there's no RAM snacks 🍓
  • -EPERM — Not enough permissions. you don't have the keys to this party 🔑
fr fr, all of these are negative codes — do not be out here treating them as positive vibes.

🌈 SEE ALSO 🌈

okay this list is lowkey iconic, it's the whole nilfs2 ioctl squad 🫶 — from the kernel file ./fs/nilfs2/ioctl.c:

and that's the page, bestie 💅 signed, sealed, delivered from ./fs/nilfs2, dated October 2026, and yeah — she's still nilfs_ioctl_set_suinfo(9) in case you forgot. iykyk 🦋✨

📦 where this page comes from