Re: [PATCH] pm-hibernate: flush block device cache when hibernating

[Mikulas Patocka <mpatocka@redhat.com>]

On Mon, 27 Oct 2025, Askar Safin wrote:

> Mikulas Patocka <mpatocka@redhat.com>:
> > Hi
> > 
> > Does this patch fix it?
> > 
> > Mikulas
> > 
> > 
> > From: Mikulas Patocka <mpatocka@redhat.com>
> > 
> > There was reported failure that hibernation doesn't work with 
> > dm-integrity. The reason for the failure is that the hibernation code 
> > doesn't issue the FLUSH bio - the data still sits in the dm-integrity 
> > cache and they are lost when poweroff happens.
> 
> I tested this patch in Qemu on current master (43e9ad0c55a3). Also I
> applied Mario's patch
> https://lore.kernel.org/linux-pm/20251026033115.436448-1-superm1@kernel.org/ .
> It is needed, otherwise you get WARNING when you try to hibernate.
> 
> The patch doesn't work.

Yes, I see - the problem is harder than I thought.

I've created two patches and I tested them that they work. So, you can try 
them.

Mikulas