On Wed, Nov 24, 2021 at 02:18:00PM +0800, Qu Wenruo wrote:

Just so simple? Then that's super awesome.

But I'm a little concerned about the bio_add_hw_page() call in
bio_add_zoned_append().

It's not exactly the same as bio_add_page().

Does it mean as long as our splitted bio doesn't exceed zone limit, we
can do the convert without any further problem?

You need to look at the limits when splitting.  I have modified
blk_bio_segment_split and exported it to deal with that.  Let me split
those changes out cleanly and push out a branch.