linux-kernel - Re: [PATCH V8 04/11] fs/xfs: Change XFS_MOUNT_DAX to XFS_MOUNT_DAX

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Date:   Mon, 20 Apr 2020 10:50:02 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Dave Chinner <david@...morbit.com>
Cc:     linux-kernel@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jeff Moyer <jmoyer@...hat.com>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH V8 04/11] fs/xfs: Change XFS_MOUNT_DAX to
 XFS_MOUNT_DAX_ALWAYS

On Mon, Apr 20, 2020 at 12:15:55PM +1000, Dave Chinner wrote:
> On Tue, Apr 14, 2020 at 11:45:16PM -0700, ira.weiny@...el.com wrote:
> > From: Ira Weiny <ira.weiny@...el.com>
> > 
> > In prep for the new tri-state mount option which then introduces
> > XFS_MOUNT_DAX_NEVER.
> > 
> > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> > ---
> >  fs/xfs/xfs_iops.c  | 2 +-
> >  fs/xfs/xfs_mount.h | 2 +-
> >  fs/xfs/xfs_super.c | 8 ++++----
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> > 
> > diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> > index 81f2f93caec0..a6e634631da8 100644
> > --- a/fs/xfs/xfs_iops.c
> > +++ b/fs/xfs/xfs_iops.c
> > @@ -1248,7 +1248,7 @@ xfs_inode_supports_dax(
> >  		return false;
> >  
> >  	/* DAX mount option or DAX iflag must be set. */
> > -	if (!(mp->m_flags & XFS_MOUNT_DAX) &&
> > +	if (!(mp->m_flags & XFS_MOUNT_DAX_ALWAYS) &&
> >  	    !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
> >  		return false;
> >  
> > diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
> > index 88ab09ed29e7..54bd74088936 100644
> > --- a/fs/xfs/xfs_mount.h
> > +++ b/fs/xfs/xfs_mount.h
> > @@ -233,7 +233,7 @@ typedef struct xfs_mount {
> >  						   allocator */
> >  #define XFS_MOUNT_NOATTR2	(1ULL << 25)	/* disable use of attr2 format */
> >  
> > -#define XFS_MOUNT_DAX		(1ULL << 62)	/* TEST ONLY! */
> > +#define XFS_MOUNT_DAX_ALWAYS	(1ULL << 62)	/* TEST ONLY! */
> 
> As this is going to be permanent, please remove the "Test only"

I did that in the next patch...  But I'll move it here.

> comment and renumber the bits used down to 26. - the high bit was
> used only to keep it out of the ranges that permanent mount option
> flags used...

Ok, done for v9

Ira

> 
> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david@...morbit.com