btrfs: obtain block checksums from user space

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Hello,

I would like to read the list of the checksums for the specific file
stored onto btrfs filesystem. I think I could use the checksums in the
manner like rsync does, but safe both CPU (because csums are already
calculated for the file) and I/O (because I don't need to reread all the
file from the hard drive).

I've looked through linux kernel sources and not found appropriate ioctl
to do this. Frankly speaking, I've not found good documentations for all
available btrfs ioctls.

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