Re: [PATCH v2 0/4] btrfs: move some features out of experimental

[David Sterba <dsterba@suse.cz>]

On Fri, Feb 27, 2026 at 02:03:42PM +1030, Qu Wenruo wrote:
> [CHANGELOG]
> v2:
> - Move bs < ps && bs != 4K out of experimental
>   That feature is a pretty small niche though.
>   The basis is already there from the bs < ps support for a while.
> 
> - Remove 2K block size support
>   That is too niche, considering how easy to trigger subpage routine
>   with the larger data folio support, there is not much need for it.
> 
> The following features can be moved out of experimental in v7.1:
> 
> - Large data folios
>   It's introduced in v6.17, but we still have a bug fix related for it
>   in v6.19.
>   If there is no new bug exposed I believe it's time to expose this
>   feature to end users.
> 
> - Shutdown and remove_bdev callbacks
>   It's introduced in v6.19, but there is no major known bug exposed yet.
>   Furthermore the remove_bdev callback, aka auto-shutdown/degradation
>   when a device is missing, can affect end users.
> 
>   Thus we want some feedbacks from early adopters.
> 
> - Block size smaller than page size but not 4K support
>   The requirement for 4K block size is purely artificial to reduce our
>   test load.
>   But since we're moving towards supporting all block sizes, the
>   artifical limit can be lifted now.

Adding all of them at once feels a bit risky. I don't think that it has
enough exposure and testing because of number of the possible
combinations.

The shutdown is orthogonal to the rest so this can be enabled by
default. For the rest the bs/ps is namely an ARM thing with the 64K
pages, and large folios is using an internal API in a new way.
Here I'd pick just one and make sure we have it covered by CI. I'm
setting it up again on github actions but it's going slower than
expected.