btrfs supports reflinks, XFS supports reflinks (since 2017 I think?).
Are there any other filesystems that support it?
truncate -s 1G test.file; cp --reflink=always test.file ref.test.file;
Answers:
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Method 1
Support for reflinks is indicated using the remap_file_range operation, which is currently (5.11) supported by Btrfs, CIFS, NFS 4.2, OCFS2, overlayfs, and XFS.
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