Re: [PATCH 049/119] xfs: enable the rmap btree functionality

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On Thu, Jun 16, 2016 at 06:23:05PM -0700, Darrick J. Wong wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> Add the feature flag to the supported matrix so that the kernel can
> mount and use rmap btree enabled filesystems
> 
> v2: Move the EXPERIMENTAL message to fill_super so it only prints once.
> 
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
> [darrick.wong@xxxxxxxxxx: move the experimental tag]
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---

Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>

>  fs/xfs/libxfs/xfs_format.h |    3 ++-
>  fs/xfs/xfs_super.c         |    4 ++++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> 
> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> index 6efc7a3..1b08237 100644
> --- a/fs/xfs/libxfs/xfs_format.h
> +++ b/fs/xfs/libxfs/xfs_format.h
> @@ -457,7 +457,8 @@ xfs_sb_has_compat_feature(
>  #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)		/* free inode btree */
>  #define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)		/* reverse map btree */
>  #define XFS_SB_FEAT_RO_COMPAT_ALL \
> -		(XFS_SB_FEAT_RO_COMPAT_FINOBT)
> +		(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
> +		 XFS_SB_FEAT_RO_COMPAT_RMAPBT)
>  #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN	~XFS_SB_FEAT_RO_COMPAT_ALL
>  static inline bool
>  xfs_sb_has_ro_compat_feature(
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index a8300e4..9328821 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -1571,6 +1571,10 @@ xfs_fs_fill_super(
>  		xfs_alert(mp,
>  	"EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");
>  
> +	if (xfs_sb_version_hasrmapbt(&mp->m_sb))
> +		xfs_alert(mp,
> +	"EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
> +
>  	error = xfs_mountfs(mp);
>  	if (error)
>  		goto out_filestream_unmount;
> 
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