On Mon, Jun 20 2016 at 5:28pm -0400,
Kani, Toshimitsu <toshi.kani@xxxxxxx> wrote:
> On Mon, 2016-06-20 at 14:01 -0600, Kani, Toshimitsu wrote:
> > On Mon, 2016-06-20 at 15:52 -0400, Mike Snitzer wrote:
> > >
> > > On Mon, Jun 20 2016 at 3:40pm -0400,
> > > Mike Snitzer <snitzer@xxxxxxxxxx> wrote:
> > >
> :
> > > > If I don't use XFS, and only issue IO directly to the /dev/pmem/lv, I
> > > > don't see this corruption.
> > >
> > > I did the same test with ext4 instead of xfs and it resulted in the same
> > > type of systemic corruption (lvm2 metadata corrupted too):
> > >
> :
> > I will look into the issue.
>
> Hi Mike,
>
> Can you fold the following patch to the dm-linear patch?
>
> Thanks,
> -Tsohi
>
> ------
> Subject: [PATCH] dm-linear: Fix partition handling for DAX
>
> Partition handling was missing in linear_direct_access().
> Call bdev_direct_access(), instead of directly calling
> target direct_access function.
>
> Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
> ---
> drivers/md/dm-linear.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
> index 325aa06..38323e4 100644
> --- a/drivers/md/dm-linear.c
> +++ b/drivers/md/dm-linear.c
> @@ -148,10 +148,16 @@ static long linear_direct_access(struct dm_target *ti,
> sector_t sector,
> {
> struct linear_c *lc = ti->private;
> struct block_device *bdev = lc->dev->bdev;
> - const struct block_device_operations *bd_ops = bdev->bd_disk->fops;
> -
> - return bd_ops->direct_access(bdev, linear_map_sector(ti, sector),
> - kaddr, pfn, size);
> + struct blk_dax_ctl dax = {
> + .sector = linear_map_sector(ti, sector),
> + .size = size,
> + };
> + long ret;
> +
> + ret = bdev_direct_access(bdev, &dax);
> + *kaddr = dax.addr;
> + *pfn = dax.pfn;
> + return ret;
> }
>
> static struct target_type linear_target = {
Looks good, I folded it in and tested it to work. Pushed to my 'wip'
branch.
No longer seeing any corruption in my test that was using partitions to
span pmem devices with a dm-linear device.
Jens, any chance you'd be open to picking up the first 2 patches in this
series? Or would you like to see them folded or something different?
Mike
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
