xfs: enable the rmap btree functionality

Originally-From: Dave Chinner <dchinner@redhat.com>

Add the feature flag to the supported matrix so that the kernel can
mount and use rmap btree enabled filesystems

Signed-off-by: Dave Chinner <dchinner@redhat.com>
[darrick.wong@oracle.com: move the experimental tag]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

2 files changed, 6 insertions, 1 deletions

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index f6a0641e64c8..f814d42c73b2 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 9f8090951f09..45773df1dd0b 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1574,6 +1574,10 @@ xfs_fs_fill_super(
                 }
         }
 
+        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;