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Otherwise, you'll want to unount the partition, not write anything to it, and boot to a LiveCD and use a utility called "testdisk" (to prevent the file from being overwritten). You can get if from http://www.cgsecurity.org/ and through software.opensuse.org and possibly zypper. testdisk wasn't originally made for btrfs but it might be able to help you. The first few Google searches I skimmed through didn't have any better ideas.
No, photorec is part of the "testdisk" package. Photorec is the tool to use here, not testdisk. Testdisk only restores partition tables.
A filesystem debugger would be a more surgical tool to recover one particular deleted file, instead of all and then searching through them. But I don't know if there is such a debugger for btrfs, and filesystem debuggers require a hell of learning to use.