btrfs-extent-same(8)

💖 btrfs-extent-same(8) — System Manager's Manual 💖

okay bestie, pull up a chair, because this little tool from the btrfs family is short but iconic — it's btrfs-extent-same, and yes, it's exactly what it sounds like. 🦋

✨ NAME ✨

btrfs-extent-same — directly access the FIDEDUPRANGE ioctl 💅

🌸 SYNOPSIS 🌸

btrfs-extent-same extent-len file1 offset1 file2 offset2 [...]

🎀 DESCRIPTION 🎀

so basically, btrfs-extent-same is a lil wrapper around the FIDEDUPRANGE ioctl — like, it's the friendly face on the syscall, the group-chat translator for the kernel, yk? 🫶

ngl there's one thing you absolutely have to remember: extent-len and all the offsets should be specified in bytes. bytes, bestie. not blocks, not vibes. bytes. 😭

🌈 SEE ALSO 🌈

• filesystems(5)
• btrfs(8)
• ioctl_fideduprange(2)
• xfs_io(8)

and that's the whole page, no cap 💜 this one's from the btrfs-extent-same manual, dated March 2014 — shoutout to the System Manager's Manual era, she ate and left no crumbs. 👑✨ go dedupe some extents, you main character. 🎀💖