Re: [PATCH] Revert "block: simplify set_init_blocksize" to regain lost performance

While this code is gross, I think we need to add it back for now:

Acked-by: Christoph Hellwig <hch@lst.de>

I'll put converting the block device buffered I/O path to iomap or
an iomap lookalike on the backburner to fix this..