[v10,4/7] dm: enable synchronous dax
diff mbox series

Message ID 20190521133713.31653-5-pagupta@redhat.com
State Superseded
Headers show
Series
  • virtio pmem driver
Related show

Commit Message

Pankaj Gupta May 21, 2019, 1:37 p.m. UTC
This patch sets dax device 'DAXDEV_SYNC' flag if all the target
 devices of device mapper support synchrononous DAX. If device
 mapper consists of both synchronous and asynchronous dax devices,
 we don't set 'DAXDEV_SYNC' flag. 

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
---
 drivers/md/dm-table.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Comments

Dan Williams June 1, 2019, 6:28 a.m. UTC | #1
On Tue, May 21, 2019 at 6:43 AM Pankaj Gupta <pagupta@redhat.com> wrote:
>
>  This patch sets dax device 'DAXDEV_SYNC' flag if all the target
>  devices of device mapper support synchrononous DAX. If device
>  mapper consists of both synchronous and asynchronous dax devices,
>  we don't set 'DAXDEV_SYNC' flag.
>
> Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
> ---
>  drivers/md/dm-table.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index cde3b49b2a91..1cce626ff576 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -886,10 +886,17 @@ static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
>         return bdev_dax_supported(dev->bdev, PAGE_SIZE);
>  }
>
> +static int device_synchronous(struct dm_target *ti, struct dm_dev *dev,
> +                              sector_t start, sector_t len, void *data)
> +{
> +       return dax_synchronous(dev->dax_dev);
> +}
> +
>  static bool dm_table_supports_dax(struct dm_table *t)
>  {
>         struct dm_target *ti;
>         unsigned i;
> +       bool dax_sync = true;
>
>         /* Ensure that all targets support DAX. */
>         for (i = 0; i < dm_table_get_num_targets(t); i++) {
> @@ -901,7 +908,14 @@ static bool dm_table_supports_dax(struct dm_table *t)
>                 if (!ti->type->iterate_devices ||
>                     !ti->type->iterate_devices(ti, device_supports_dax, NULL))
>                         return false;
> +
> +               /* Check devices support synchronous DAX */
> +               if (dax_sync &&
> +                   !ti->type->iterate_devices(ti, device_synchronous, NULL))
> +                       dax_sync = false;

Looks like this needs to be rebased on the current state of v5.2-rc,
and then we can nudge Mike for an ack.
Pankaj Gupta June 10, 2019, 5:08 a.m. UTC | #2
> On Tue, May 21, 2019 at 6:43 AM Pankaj Gupta <pagupta@redhat.com> wrote:
> >
> >  This patch sets dax device 'DAXDEV_SYNC' flag if all the target
> >  devices of device mapper support synchrononous DAX. If device
> >  mapper consists of both synchronous and asynchronous dax devices,
> >  we don't set 'DAXDEV_SYNC' flag.
> >
> > Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
> > ---
> >  drivers/md/dm-table.c | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> >
> > diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> > index cde3b49b2a91..1cce626ff576 100644
> > --- a/drivers/md/dm-table.c
> > +++ b/drivers/md/dm-table.c
> > @@ -886,10 +886,17 @@ static int device_supports_dax(struct dm_target *ti,
> > struct dm_dev *dev,
> >         return bdev_dax_supported(dev->bdev, PAGE_SIZE);
> >  }
> >
> > +static int device_synchronous(struct dm_target *ti, struct dm_dev *dev,
> > +                              sector_t start, sector_t len, void *data)
> > +{
> > +       return dax_synchronous(dev->dax_dev);
> > +}
> > +
> >  static bool dm_table_supports_dax(struct dm_table *t)
> >  {
> >         struct dm_target *ti;
> >         unsigned i;
> > +       bool dax_sync = true;
> >
> >         /* Ensure that all targets support DAX. */
> >         for (i = 0; i < dm_table_get_num_targets(t); i++) {
> > @@ -901,7 +908,14 @@ static bool dm_table_supports_dax(struct dm_table *t)
> >                 if (!ti->type->iterate_devices ||
> >                     !ti->type->iterate_devices(ti, device_supports_dax,
> >                     NULL))
> >                         return false;
> > +
> > +               /* Check devices support synchronous DAX */
> > +               if (dax_sync &&
> > +                   !ti->type->iterate_devices(ti, device_synchronous,
> > NULL))
> > +                       dax_sync = false;
> 
> Looks like this needs to be rebased on the current state of v5.2-rc,
> and then we can nudge Mike for an ack.

Sorry! for late reply due to vacations. I will rebase the series on v5.2-rc4 and
send a v11.

Thanks,
Pankaj
Yes, 
>

Patch
diff mbox series

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index cde3b49b2a91..1cce626ff576 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -886,10 +886,17 @@  static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
 	return bdev_dax_supported(dev->bdev, PAGE_SIZE);
 }
 
+static int device_synchronous(struct dm_target *ti, struct dm_dev *dev,
+			       sector_t start, sector_t len, void *data)
+{
+	return dax_synchronous(dev->dax_dev);
+}
+
 static bool dm_table_supports_dax(struct dm_table *t)
 {
 	struct dm_target *ti;
 	unsigned i;
+	bool dax_sync = true;
 
 	/* Ensure that all targets support DAX. */
 	for (i = 0; i < dm_table_get_num_targets(t); i++) {
@@ -901,7 +908,14 @@  static bool dm_table_supports_dax(struct dm_table *t)
 		if (!ti->type->iterate_devices ||
 		    !ti->type->iterate_devices(ti, device_supports_dax, NULL))
 			return false;
+
+		/* Check devices support synchronous DAX */
+		if (dax_sync &&
+		    !ti->type->iterate_devices(ti, device_synchronous, NULL))
+			dax_sync = false;
 	}
+	if (dax_sync)
+		set_dax_synchronous(t->md->dax_dev);
 
 	return true;
 }