On Sun, 20 Dec 2020 14:02:22 +0100
Lukas Straub <lukasstraub2@web.de> wrote:

> With an external metadata device, flush requests aren't passed down
> to the data device.
> 
> Fix this by issuing flush in the right places: In integrity_commit
> when not in journal mode, in do_journal_write after writing the
> contents of the journal to the disk and in dm_integrity_postsuspend.
> 
> Signed-off-by: Lukas Straub <lukasstraub2@web.de>
> ---
>  drivers/md/dm-integrity.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
> index 5a7a1b90e671..a26ed65869f6 100644
> --- a/drivers/md/dm-integrity.c
> +++ b/drivers/md/dm-integrity.c
> @@ -2196,6 +2196,8 @@ static void integrity_commit(struct work_struct *w)
>  	if (unlikely(ic->mode != 'J')) {
>  		spin_unlock_irq(&ic->endio_wait.lock);
>  		dm_integrity_flush_buffers(ic);
> +		if (ic->meta_dev)
> +			blkdev_issue_flush(ic->dev->bdev, GFP_NOIO);
>  		goto release_flush_bios;
>  	}
>  
> @@ -2410,6 +2412,9 @@ static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
>  	wait_for_completion_io(&comp.comp);
>  
>  	dm_integrity_flush_buffers(ic);
> +	if (ic->meta_dev)
> +		blkdev_issue_flush(ic->dev->bdev, GFP_NOIO);
> +
>  }
>  
>  static void integrity_writer(struct work_struct *w)
> @@ -2949,6 +2954,9 @@ static void dm_integrity_postsuspend(struct dm_target *ti)
>  #endif
>  	}
>  
> +	if (ic->meta_dev)
> +		blkdev_issue_flush(ic->dev->bdev, GFP_NOIO);
> +
>  	BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
>  
>  	ic->journal_uptodate = true;

Ping...

--