On Fri, Feb 18, 2022 at 11:35:10PM -0800, Christoph Hellwig wrote: > Err, hell no. Please do not add any new functionality to the legacy > buffer head code. If you want new features do that on the > non-bufferhead iomap code path only please. I think "first convert the block device code from buffer_heads to iomap" might be a bit much of a prerequisite. I think running ext4 on top of a block device still requires buffer_heads, for example (I tried to convert the block device to use mpage in order to avoid creating buffer_heads when possible, and ext4 stopped working. I didn't try too hard to debug it as it was a bit of a distraction at the time).
