6 ms·

I was copying a file today and thought: "Why is it duplicating the data? Why does it not just create a new second filename pointer in the filesystem?"

• WhatIsDukkha 4y ago
  Take a look at the cp man page - https://www.man7.org/linux/man-pages/man1/cp.1.html https://www.man7.org/linux/man-pages/man1/cp.1.html Look for "reflink" and you get your wish :)
  • bartimus 4y ago
    Very cool! :)
  • jwilk 4y ago
    FICLONE is the underlying ioctl: https://www.man7.org/linux/man-pages/man2/ioctl_ficlone.2.html https://www.man7.org/linux/man-pages/man2/ioctl_ficlone.2.ht... As of Linux 5.18, it's supported by btrfs, xfs, overlayfs and some networking filesystems.