linux-ext4 - Re: [PATCH 8/9] xfs: factor out a xfs_buftarg_is

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Date:   Thu, 26 Aug 2021 08:11:15 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 8/9] xfs: factor out a xfs_buftarg_is_dax helper

On Thu, Aug 26, 2021 at 07:37:29AM -0700, Dan Williams wrote:
> [ add Darrick ]
> 
> 
> On Thu, Aug 26, 2021 at 7:07 AM Christoph Hellwig <hch@....de> wrote:
> >
> > Refactor the DAX setup code in preparation of removing
> > bdev_dax_supported.
> >
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> > ---
> >  fs/xfs/xfs_super.c | 15 +++++++++++----
> >  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> Darrick, any concerns with me taking this through the dax tree?

Nope.

Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> 
> >
> > diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> > index 2c9e26a44546..5a89bf601d97 100644
> > --- a/fs/xfs/xfs_super.c
> > +++ b/fs/xfs/xfs_super.c
> > @@ -314,6 +314,14 @@ xfs_set_inode_alloc(
> >         return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
> >  }
> >
> > +static bool
> > +xfs_buftarg_is_dax(
> > +       struct super_block      *sb,
> > +       struct xfs_buftarg      *bt)
> > +{
> > +       return bdev_dax_supported(bt->bt_bdev, sb->s_blocksize);
> > +}
> > +
> >  STATIC int
> >  xfs_blkdev_get(
> >         xfs_mount_t             *mp,
> > @@ -1549,11 +1557,10 @@ xfs_fs_fill_super(
> >                 xfs_warn(mp,
> >                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
> >
> > -               datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
> > -                       sb->s_blocksize);
> > +               datadev_is_dax = xfs_buftarg_is_dax(sb, mp->m_ddev_targp);
> >                 if (mp->m_rtdev_targp)
> > -                       rtdev_is_dax = bdev_dax_supported(
> > -                               mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
> > +                       rtdev_is_dax = xfs_buftarg_is_dax(sb,
> > +                                               mp->m_rtdev_targp);
> >                 if (!rtdev_is_dax && !datadev_is_dax) {
> >                         xfs_alert(mp,
> >                         "DAX unsupported by block device. Turning off DAX.");
> > --
> > 2.30.2
> >
> >