On Fri, Jan 15, 2021 at 01:02:12AM +0100, waxhead wrote:

quoted

I don't think the per-subvolume storage options were ever tracked on
wiki, the closest match is per-subvolume mount options that's still
there

https://btrfs.wiki.kernel.org/index.php/Project_ideas#Per-subvolume_mount_options

Well how about this from our friends archive.org ?
http://web.archive.org/web/20200117205248/https://btrfs.wiki.kernel.org/index.php/Main_Page

Here it clearly states that object level mirroring and striping is 
planned. Maybe I misinterpret this , but I understand this as (amongst 
other things) configurable storage profiles per subvolume.

I see. The list on the main page is supposed to list features that we could
promise to be implemented "soon". For all the ideas there's the specific
project page wher it does not matter too much when it will implemented, it's
kind of a pool.

In the wiki edit that removed the object-level storage I also removed
(https://btrfs.wiki.kernel.org/index.php?title=Main_Page&diff=prev&oldid=33190)

* Online filesystem check
* Object-level mirroring and striping
* In-band deduplication (happens during writes)
* Hot data tracking and moving to faster devices (or provided on the generic VFS layer)

For each of the task there's nobody working on that, to my knowledge,
though there was some interest and maybe RFC patches in the past.

The object-level storage idea/task can be added to the Project_ideas
page, so it's not lost.