nilfs_ioctl_get_cpstat(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nilfs_ioctl_get_cpstat — get checkpoints statistics

okay bestie, this one is a kernel API manual page — nilfs_ioctl_get_cpstat(9), from the 9 section, the kernel-api of the manual 💜 — and it's literally just here to tell you how to peek at checkpoint stats. Let's get into it.

✨ SYNOPSIS ✨

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

that's the whole signature, no cap 🫶

🌸 ARGUMENTS 🌸

  • inode — the inode object. yes, that one 🎀
  • filp — the file object, hi bestie 👋
  • cmd — the ioctl's request code, the little label that says which job this is
  • argp — a pointer on the argument from userspace 💫 (userspace is handing you something, be nice to it)

👑 DESCRIPTION 👑

nilfs_ioctl_get_cpstat returns information about checkpoints. periodt.

The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities and by nilfs_cleanerd daemon. so like, this isn't some obscure little guy — actual tools are out here relying on it 🔥

The checkpoint statistics get copied to the userspace memory pointed to by argp. that's it, that's the whole vibe — stats from kernel land, yeeted into your buffer 💅

💀 RETURN 💀

0 on success, or one of the following negative error codes on failure:

  • -EFAULT — Failure during getting checkpoints statistics.
  • -EIO — I/O error.
  • -ENOMEM — Insufficient memory available.
bestie if you get a negative number back, that's a no. don't act surprised 😭

🦋 SEE ALSO 🦋

Kernel file ./fs/nilfs2/ioctl.c and, like, the entire friend group:

no because that's a whole contact list and every single one of them is a real one 🧚

okay that's the page!! mwah 💖 this little queen lives in ./fs/nilfs2 and her version stamp says October 2026, filed under nilfs_ioctl_get_cpstat(9) — go forth and get those checkpoint stats, bestie, iykyk 🌈⭐

📦 where this page comes from