linux-kernel - Re: [PATCH 01/19] dax: remove block device dependencies

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Date:   Tue, 27 Aug 2019 23:58:09 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>, miklos@...redi.hu,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        dgilbert@...hat.com, virtio-fs@...hat.com, stefanha@...hat.com,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 01/19] dax: remove block device dependencies

On Tue, Aug 27, 2019 at 12:38:28PM -0400, Vivek Goyal wrote:
> > For bdev_dax_pgoff
> > I'd much rather have the partition offset if there is on in the daxdev
> > somehow so that we can get rid of the block device entirely.
> 
> IIUC, there is one block_device per partition while there is only one
> dax_device for the whole disk. So we can't directly move bdev logical
> offset into dax_device.

Well, then we need to find a way to get partitions for dax devices,
as we really should not expect a block device hiding behind a dax
dev.  That is just a weird legacy assumption - block device need to
layer on top of the dax device optionally.

> 
> We probably could put this in "iomap" and leave it to filesystems to
> report offset into dax_dev in iomap that way dax generic code does not
> have to deal with it. But that probably will be a bigger change.

And where would the file system get that information from?

> commit 4b0228fa1d753f77fe0e6cf4c41398ec77dfbd2a
> Author: Vishal Verma <vishal.l.verma@...el.com>
> Date:   Thu Apr 21 15:13:46 2016 -0400
> 
>  dax: for truncate/hole-punch, do zeroing through the driver if possible
> 
> IIUC, they are doing it so that they can clear gendisk->badblocks list.
> 
> So even if there is pure dax way to do it, there will have to some
> involvment of block layer to clear gendisk->badblocks list.

Once again we need to move that list to the dax device, as the
assumption that there is a block device associated with the dax dev
is flawed.

> I am not sure I fully understand your suggestion. But I am hoping its
> not a must for these changes to make a progress. For now, I will drop
> change to dax_range_is_aligned().

Well, someone needs to clean this mess up, and as you have an actual
real life example of a dax dev without the block device I think the
burden naturally falls on you.