Add copy-on-write support for BTRFS filesystem #3
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After this change CopyFile try make copy-on-write (constant time) file copy on BTRFS filesystem.
If copy-on-write operation is not supported - failback to byte-to-byte file copy.
This command works like:
For this change I use https://github.com/wertarbyte/coreutils/blob/master/src/copy.c as reference.