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From: Mike Snitzer <snitzer@redhat.com>
To: Pankaj Gupta <pagupta@redhat.com>
Cc: cohuck@redhat.com, jack@suse.cz, kvm@vger.kernel.org,
	mst@redhat.com, jasowang@redhat.com, david@fromorbit.com,
	qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org,
	dm-devel@redhat.com, adilger kernel <adilger.kernel@dilger.ca>,
	zwisler@kernel.org, aarcange@redhat.com,
	dave jiang <dave.jiang@intel.com>,
	jstaron@google.com, linux-nvdimm@lists.01.org,
	vishal l verma <vishal.l.verma@intel.com>,
	david@redhat.com, willy@infradead.org, hch@infradead.org,
	linux-acpi@vger.kernel.org, jmoyer@redhat.com,
	linux-ext4@vger.kernel.org, lenb@kernel.org, kilobyte@angband.pl,
	rdunlap@infradead.org, riel@surriel.com,
	yuval shaia <yuval.shaia@oracle.com>,
	stefanha@redhat.com, pbonzini@redhat.com,
	dan j williams <dan.j.williams@intel.com>,
	lcapitulino@redhat.com, kwolf@redhat.com, nilal@redhat.com,
	tytso@mit.edu, xiaoguangrong eric <xiaoguangrong.eric@gmail.com>,
	darrick wong <darrick.wong@oracle.com>,
	rjw@rjwysocki.net, linux-kernel@vger.kernel.org,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	imammedo@redhat.com
Subject: Re: [PATCH v11 4/7] dm: enable synchronous dax
Date: Tue, 11 Jun 2019 11:04:27 -0400
Message-ID: <20190611150427.GA29288@redhat.com> (raw)
In-Reply-To: <1206355816.34396746.1560258658768.JavaMail.zimbra@redhat.com>

On Tue, Jun 11 2019 at  9:10am -0400,
Pankaj Gupta <pagupta@redhat.com> wrote:

> Hi Mike,
> 
> Thanks for the review Please find my reply inline.
> 
> > 
> > dm_table_supports_dax() is called multiple times (from
> > dm_table_set_restrictions and dm_table_determine_type).  It is strange
> > to have a getter have a side-effect of being a setter too.  Overloading
> > like this could get you in trouble in the future.
> > 
> > Are you certain this is what you want?
> 
> I agree with you.
> 
> > 
> > Or would it be better to refactor dm_table_supports_dax() to take an
> > iterate_devices_fn arg and have callers pass the appropriate function?
> > Then have dm_table_set_restrictions() caller do:
> > 
> >      if (dm_table_supports_dax(t, device_synchronous, NULL))
> >                set_dax_synchronous(t->md->dax_dev);
> > 
> > (NULL arg implies dm_table_supports_dax() refactoring would take a int
> > *data pointer rather than int type).
> > 
> > Mike
> > 
> 
> I am sending below patch as per your suggestion. Does it look
> near to what you have in mind?

Yes, it does.. just one nit I noticed inlined below.

> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index 350cf0451456..8d89acc8b8c2 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c

...

> @@ -1910,8 +1919,13 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
>         }
>         blk_queue_write_cache(q, wc, fua);
> 
> -       if (dm_table_supports_dax(t, PAGE_SIZE))
> +       if (dm_table_supports_dax(t, device_supports_dax, &page_size)) {
> +

No need for an empty newline here ^

>                 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
> +               if (dm_table_supports_dax(t, device_synchronous, NULL))
> +                       set_dax_synchronous(t->md->dax_dev);
> +       }
>         else
>                 blk_queue_flag_clear(QUEUE_FLAG_DAX, q);
> 

Thanks,
Mike

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10  9:07 [PATCH v11 0/7] virtio pmem driver Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 1/7] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 2/7] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 3/7] libnvdimm: add dax_dev sync flag Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 4/7] dm: enable synchronous dax Pankaj Gupta
2019-06-10 19:28   ` Mike Snitzer
2019-06-11 13:10     ` [Qemu-devel] " Pankaj Gupta
2019-06-11 15:04       ` Mike Snitzer [this message]
2019-06-11 16:04         ` Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 5/7] dax: check synchronous mapping is supported Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 6/7] ext4: disable map_sync for async flush Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 7/7] xfs: " Pankaj Gupta

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