Re: [PATCH 4/4] writeback: remove bdi->congested_fn

[David Sterba]

On Wed, Jul 01, 2020 at 11:06:22AM +0200, Christoph Hellwig wrote:
> Except for pktdvd, the only places setting congested bits are file
> systems that allocate their own backing_dev_info structures.  And
> pktdvd is a deprecated driver that isn't useful in stack setup
> either.  So remove the dead congested_fn stacking infrastructure.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  drivers/block/drbd/drbd_main.c   | 59 --------------------------------
>  drivers/md/bcache/request.c      | 43 -----------------------
>  drivers/md/bcache/super.c        |  1 -
>  drivers/md/dm-cache-target.c     | 19 ----------
>  drivers/md/dm-clone-target.c     | 15 --------
>  drivers/md/dm-era-target.c       | 15 --------
>  drivers/md/dm-raid.c             | 12 -------
>  drivers/md/dm-table.c            | 37 +-------------------
>  drivers/md/dm-thin.c             | 16 ---------
>  drivers/md/dm.c                  | 33 ------------------
>  drivers/md/dm.h                  |  1 -
>  drivers/md/md-linear.c           | 24 -------------
>  drivers/md/md-multipath.c        | 23 -------------
>  drivers/md/md.c                  | 23 -------------
>  drivers/md/md.h                  |  4 ---
>  drivers/md/raid0.c               | 16 ---------
>  drivers/md/raid1.c               | 31 -----------------
>  drivers/md/raid10.c              | 26 --------------
>  drivers/md/raid5.c               | 25 --------------

For the btrfs bits

>  fs/btrfs/disk-io.c               | 23 -------------

Acked-by: David Sterba <dsterba@xxxxxxxx>