[XFS] Track external log/realtime device names for correct reporting in

/proc/mounts.

SGI-PV: 942984
SGI-Modid: xfs-linux:xfs-kern:23862a

Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/xfs_mount.h

@@ -292,6 +292,8 @@ typedef struct xfs_mount {
 	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
 	char			*m_fsname;	/* filesystem name */
 	int			m_fsname_len;	/* strlen of fs name */
+	char			*m_rtname;	/* realtime device name */
+	char			*m_logname;	/* external log device name */
 	int			m_bsize;	/* fs logical block size */
 	xfs_agnumber_t		m_agfrotor;	/* last ag where space found */
 	xfs_agnumber_t		m_agirotor;	/* last ag dir inode alloced */