nilfs_ioctl_get_bdescs(9)

📦 version 7.3.1, in nixpkgs unstable

okay so welcome to nilfs_ioctl_get_bdescs(9), a page in the Kernel API Manual 🫶 — we are literally getting disk block descriptors, no cap.

🎀 NAME 🎀

nilfs_ioctl_get_bdescs — get disk block descriptors 💅

✨ SYNOPSIS ✨

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

🌸 ARGUMENTS 🌸

  • inode — the inode object, obvs.
  • filp — the file object.
  • cmd — the ioctl's request code, iykyk.
  • argp — a pointer to the argument from userspace.

🦋 DESCRIPTION 🦋

okay so the nilfs_ioctl_do_get_bdescs function returns info about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl is the one used by the nilfs_cleanerd daemon. If it's successful, the disk block descriptors get copied to the userspace pointer argp. slay ✨

💖 RETURN 💖

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

  • -EFAULT — Failure during getting disk block descriptors.
  • -EINVAL — Invalid arguments from userspace.
  • -EIO — I/O error.
  • -ENOMEM — Insufficient memory available.

🌈 SEE ALSO 🌈

lowkey go peek at the kernel file ./fs/nilfs2/ioctl.c, bestie, and these other icons:

and that's the whole vibe 🫶 this page is from the ./fs/nilfs2 source/version, dated October 2026, and it's nilfs_ioctl_get_bdescs(9) — periodt 💅✨

📦 where this page comes from