xfs: add reflink feature flag to geometry

Report the reflink feature in the XFS geometry so that xfs_info and
friends know the filesystem has this feature.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

2 files changed, 5 insertions, 2 deletions

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 79455058b752..6f4f2c3d7774 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -206,7 +206,8 @@ typedef struct xfs_fsop_resblks {
 #define XFS_FSOP_GEOM_FLAGS_FTYPE       0x10000 /* inode directory types */
 #define XFS_FSOP_GEOM_FLAGS_FINOBT      0x20000 /* free inode btree */
 #define XFS_FSOP_GEOM_FLAGS_SPINODES    0x40000 /* sparse inode chunks  */
-#define XFS_FSOP_GEOM_FLAGS_RMAPBT      0x80000 /* Reverse mapping btree */
+#define XFS_FSOP_GEOM_FLAGS_RMAPBT      0x80000 /* reverse mapping btree */
+#define XFS_FSOP_GEOM_FLAGS_REFLINK     0x100000 /* files can share blocks */
 
 /*
  * Minimum and maximum sizes need for growth checks.
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 4b4059b5e501..3acbf4e03187 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -108,7 +108,9 @@ xfs_fs_geometry(
                         (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
                                 XFS_FSOP_GEOM_FLAGS_SPINODES : 0) |
                         (xfs_sb_version_hasrmapbt(&mp->m_sb) ?
-                                XFS_FSOP_GEOM_FLAGS_RMAPBT : 0);
+                                XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
+                        (xfs_sb_version_hasreflink(&mp->m_sb) ?
+                                XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
                 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
                                 mp->m_sb.sb_logsectsize : BBSIZE;
                 geo->rtsectsize = mp->m_sb.sb_blocksize;