staging: lustre: add debugging ability for LFSCK

Add the ability to debug LFSCK to libcfs. This is
broken out of patch http://review.whamcloud.com/6321.
Signed-off-by: Fan Yong <fan.yong@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2914
Reviewed-on: http://review.whamcloud.com/6321Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/linux/libcfs/libcfs_debug.h

@@ -106,7 +106,7 @@ struct ptldebug_header {
 #define S_LOV		0x00020000
 #define S_LQUOTA	0x00040000
 #define S_OSD		0x00080000
-/* unused */
+#define S_LFSCK		0x00100000
 /* unused */
 /* unused */
 #define S_LMV		0x00800000 /* b_new_cmd */

drivers/staging/lustre/lustre/libcfs/debug.c

@@ -271,6 +271,8 @@ libcfs_debug_subsys2str(int subsys)
 		return "lquota";
 	case S_OSD:
 		return "osd";
+	case S_LFSCK:
+		return "lfsck";
 	case S_LMV:
 		return "lmv";
 	case S_SEC: