As I got asked last night what tree this actually applies to, and the answer is "whatever was in Linus' tree three days ago", I have just pushed out the branch here: git://git.infradead.org/users/hch/block.git blk_holder_ops Gitweb: http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/blk_holder_ops