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I want to make you aware of a possible bug in the reflink handling of btrfs: When I reflink a file larger 2GB (on the same subvol), the reflinking fails. But it works fine for files smaller 2GB in size. I was able to track this down to btrfs with great support of Martin Raiber who created a small demo code: Source: https://urbackup.atlassian.net/secure/attachment/10201/reflink.cpp Compile: g++ reflink.cpp -o reflink Usage: reflink source-file destination-file Works if source-file is smaller 2GB and errors otherwise. Environment: Debian Wheezy 7.2 i386 --> 32 bit Ker...