xfs: clear reflink flag if setting realtime flag

Since we can only turn on the rt flag if there are no data extents,
we can safely turn off the reflink flag if the rt flag is being
turned on.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reported-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 8b9f31c..598b97b 100644 (file)
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1034,9 +1034,9 @@ xfs_ioctl_setattr_xflags(
                        return -EINVAL;
        }
 
-       /* Don't allow us to set realtime mode for a reflinked file. */
+       /* Clear reflink if we are actually able to set the rt flag. */
        if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip))
-               return -EINVAL;
+               ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
 
        /* Don't allow us to set DAX mode for a reflinked file for now. */
        if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip))