[PATCH 41/71] xfs: don't allow realtime and reflinked files to mix

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

We don't support sharing blocks on the realtime device.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 libxfs/xfs_inode_buf.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)


diff --git a/libxfs/xfs_inode_buf.c b/libxfs/xfs_inode_buf.c
index 8a804e2..2966d54 100644
--- a/libxfs/xfs_inode_buf.c
+++ b/libxfs/xfs_inode_buf.c
@@ -384,6 +384,9 @@ xfs_dinode_verify(
        xfs_ino_t               ino,
        struct xfs_dinode       *dip)
 {
+       uint16_t                flags;
+       uint64_t                flags2;
+
        if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
                return false;
 
@@ -400,6 +403,19 @@ xfs_dinode_verify(
                return false;
        if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
                return false;
+
+       flags = be16_to_cpu(dip->di_flags);
+       flags2 = be64_to_cpu(dip->di_flags2);
+
+       /* don't allow reflink/cowextsize if we don't have reflink */
+       if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
+            !xfs_sb_version_hasreflink(&mp->m_sb))
+               return false;
+
+       /* don't let reflink and realtime mix */
+       if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
+               return false;
+
        return true;
 }