nilfs_ioctl_set_alloc_range(9)

📦 version 7.3.1, in nixpkgs unstable

💖 nilfs_ioctl_set_alloc_range — NAME 💖

okay so bestie, this is nilfs_ioctl_set_alloc_range(9) from the Kernel API Manual — yes, we're in kernel-land now, put ur hair up 🎀 — and it does exactly one iconic thing: it limits the range of segments that can be allocated. that's the whole vibe. no cap.

✨ SYNOPSIS ✨

int nilfs_ioctl_set_alloc_range (struct inode *inode , void __user *argp
);

like, that's the whole signature. she's short, she's sweet, she takes two (2) arguments and returns an int. periodt. 💅

🫶 ARGUMENTS 🫶

  • inode — the inode object. yep, the inode. she's the main character here and we respect her 👑
  • argp — pointer on argument from userspace. literally just a pointer to the argument that came from userspace. that's it, that's the job 🦋

🌸 DESCRIPTION 🌸

so what does nilfs_ioctl_set_alloc_range actually do, you ask? 🧚

it defines a lower limit of segments in bytes and an upper limit of segments in bytes. that's the function's entire little purpose in life — setting the floor and the ceiling, in bytes, for the segment range. the way it just… draws a box and lives inside it. obsessed. 💜

and who's calling it? the NILFS_IOCTL_SET_ALLOC_RANGE ioctl — that's the one — and the caller is the nilfs_resize utility. so if u ever see nilfs_resize doing its thing, know that this function is lowkey behind the scenes making sure the segment range stays in its lane ✨

⭐ RETURN ⭐

  • 0 — success! slay, it worked 💖
  • a negative error code — failure. 😭 not the vibe. check ur error code and handle it fr fr.

🔥 SEE ALSO 🔥

the whole friend group 🫶 — go read these next, iykyk:

and that's the page, bestie 🩷 this little number lives in ./fs/nilfs2, dated October 2026, and answers to the name nilfs_ioctl_set_alloc_range(9) 💅✨ go set some alloc ranges, u got this 🦋

📦 where this page comes from