Comment 20 for bug 617885

Thanks Seth for drawing my attention on this.
Firstly, I was not aware of this ubuntu patching, and I would suggest to refresh the patch with the "lucab/btrfs" branch, which is currently much healthier :)
Regarding the buf/buf_btrfs issue, it's certainly my fault and it slopped through when Cedric adopted parts of the original patch.
Regarding memcmp, it may sound safer to do so, but when writing btrfs discovery I just adopted previous checking style; I will ask Cedric about it.

I'm now opening an upstream bug regarding both issues, in the meantime I believe you can safely integrate your patch.