On Wed, Apr 28, 2021 at 07:03:07AM +0800, Qu Wenruo wrote:

=== Patchset structure ===

Patch 01~02:	hardcoded PAGE_SIZE related fixes
Patch 03~05:	submit_extent_page() refactor which will reduce overhead
		for write path.
		This should benefit 4K page the most. Although the
		primary objective is just to make the code easier to
		read.
Patch 06:	Cleanup for metadata writepath, to reduce the impact on
		regular sectorsize path.
Patch 07~13:	PagePrivate2 and ordered extent related refactor.
		Although it's still a refactor, the refactor is pretty
		important for subpage data write path, as for subpage we
		could have btrfs_writepage_endio_finish_ordered() call
		across several sectors, which may or may not have
		ordered extent for those sectors.

^^^ Above patches are all subpage data write preparation ^^^

Do you think the patches 1-13 are safe to be merged independently? I've
paged through the whole patchset and some of the patches are obviously
preparatory stuff so they can go in without much risk.

I haven't looked at your git if there are updates from what was posted,
but I don't expect any significant changes, but what I saw looked ok to
me.

If there are changes, please post 1-13 (ie. all the preparatory
patches), I'll put them to misc-next so you can focus on the rest.