[PATCH 46/47] xfs: enable the rmap btree functionality

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

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 f6a0641..f814d42 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 b8d4473..fbfe6c7 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1578,6 +1578,10 @@ 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;