mdadm: define DEV_MD_DIR

It is used many times. Additionally define _LEN to avoid repeated
strlen() calls when length is needed.

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/mdadm.h b/mdadm.h
index 0d99544..67d73f9 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -100,6 +100,14 @@ struct dlm_lksb {
 #define DEFAULT_BITMAP_DELAY 5
 #define DEFAULT_MAX_WRITE_BEHIND 256
 
+/* DEV_MD_DIR points to named MD devices directory.
+ * DEV_MD_DIR_LEN is a length with Null byte excluded.
+ */
+#ifndef DEV_MD_DIR
+#define DEV_MD_DIR "/dev/md/"
+#define DEV_MD_DIR_LEN (sizeof(DEV_MD_DIR) - 1)
+#endif /* DEV_MD_DIR */
+
 /* MAP_DIR should be somewhere that persists across the pivotroot
  * from early boot to late boot.
  * /run  seems to have emerged as the best standard.