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

[Darrick J. Wong]

From: Dave Chinner <dchinner at redhat.com>

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 at redhat.com>
[darrick.wong at oracle.com: move the experimental tag]
Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
---
 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;