On Dec 08, 2021 / 17:18, David Sterba wrote:

On Wed, Dec 08, 2021 at 12:35:46AM +0900, Naohiro Aota wrote:

quoted

There are several reports of hung_task on btrfs recently.

- https://github.com/naota/linux/issues/59
- https://lore.kernel.org/linux-btrfs/CAJCQCtR=jztS3P34U_iUNoBodExHcud44OQ8oe4Jn3TK=1yFNw@mail.gmail.com/T/ (local)

(snip)

quoted

While we are debugging this issue, we found some faulty behaviors on
the zoned extent allocator. It is not the root cause of the hung as we
see a similar report also on a regular btrfs. But, it looks like that
early -ENOSPC is, at least, making the hung to happen often.

So, this series fixes the faulty behaviors of the zoned extent
allocator.

Patch 1 fixes a case when allocation fails in a dedicated block group.

Patches 2 and 3 fix the chunk allocation condition for zoned
allocator, so that it won't block a possible chunk allocation.

Naohiro Aota (3):
  btrfs: zoned: unset dedicated block group on allocation failure
  btrfs: add extent allocator hook to decide to allocate chunk or not
  btrfs: zoned: fix chunk allocation condition for zoned allocator

All seem to be relevant for 5.16-rc so I'll add them to misc-next now to
give it some testing, pull request next week. Thanks.

Hello David, thanks for your maintainer-ship always.

When I run my test set for zoned btrfs configuration, I keep on observing the
issue that Naohiro addressed with the three patches. The patches are not yet
merged to 5.16-rc7. Can I expect they get merged to rc8?

-- 
Best Regards,
Shin'ichiro Kawasaki