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

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Date:   Wed, 15 Apr 2020 08:11:23 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     ira.weiny@...el.com
Cc:     linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.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 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>

Looks straightforward,
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  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! */
>  
>  /*
>   * Max and min values for mount-option defined I/O
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 2094386af8ac..3863f41757d2 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -129,7 +129,7 @@ xfs_fs_show_options(
>  		{ XFS_MOUNT_GRPID,		",grpid" },
>  		{ XFS_MOUNT_DISCARD,		",discard" },
>  		{ XFS_MOUNT_LARGEIO,		",largeio" },
> -		{ XFS_MOUNT_DAX,		",dax" },
> +		{ XFS_MOUNT_DAX_ALWAYS,		",dax" },
>  		{ 0, NULL }
>  	};
>  	struct xfs_mount	*mp = XFS_M(root->d_sb);
> @@ -1244,7 +1244,7 @@ xfs_fc_parse_param(
>  		return 0;
>  #ifdef CONFIG_FS_DAX
>  	case Opt_dax:
> -		mp->m_flags |= XFS_MOUNT_DAX;
> +		mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
>  		return 0;
>  #endif
>  	default:
> @@ -1437,7 +1437,7 @@ xfs_fc_fill_super(
>  	if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
>  		sb->s_flags |= SB_I_VERSION;
>  
> -	if (mp->m_flags & XFS_MOUNT_DAX) {
> +	if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) {
>  		bool rtdev_is_dax = false, datadev_is_dax;
>  
>  		xfs_warn(mp,
> @@ -1451,7 +1451,7 @@ xfs_fc_fill_super(
>  		if (!rtdev_is_dax && !datadev_is_dax) {
>  			xfs_alert(mp,
>  			"DAX unsupported by block device. Turning off DAX.");
> -			mp->m_flags &= ~XFS_MOUNT_DAX;
> +			mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
>  		}
>  		if (xfs_sb_version_hasreflink(&mp->m_sb)) {
>  			xfs_alert(mp,
> -- 
> 2.25.1
>