3 files changed, 15 insertions, 7 deletions

diff --git a/config.c b/config.c
index 59d5bfb6..f44cc1d3 100644
--- a/config.c
+++ b/config.c
@@ -407,8 +407,8 @@ void arrayline(char *line)
 			if (strcasecmp(w, "<ignore>") == 0 ||
 			    strncmp(w, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 ||
 			    (w[0] != '/' && w[0] != '<') ||
-			    (strncmp(w, "/dev/md", 7) == 0 &&
-			     is_number(w + 7)) ||
+			    (strncmp(w, DEV_NUM_PREF, DEV_NUM_PREF_LEN) == 0 &&
+			     is_number(w + DEV_NUM_PREF_LEN)) ||
 			    (strncmp(w, "/dev/md_d", 9) == 0 &&
 			     is_number(w + 9))) {
 				/* This is acceptable */;
diff --git a/mdadm.h b/mdadm.h
index 67d73f96..f2e70baa 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_NUM_PREF is a subpath to numbered MD devices, e.g. /dev/md1 or directory name.
+ * DEV_NUM_PREF_LEN is a length with Null byte excluded.
+ */
+#ifndef DEV_NUM_PREF
+#define DEV_NUM_PREF "/dev/md"
+#define DEV_NUM_PREF_LEN (sizeof(DEV_NUM_PREF) - 1)
+#endif /* DEV_NUM_PREF */
+
 /* DEV_MD_DIR points to named MD devices directory.
  * DEV_MD_DIR_LEN is a length with Null byte excluded.
  */
diff --git a/mdopen.c b/mdopen.c
index 6c3bdb6a..d3022a54 100644
--- a/mdopen.c
+++ b/mdopen.c
@@ -412,11 +412,11 @@ int create_mddev(char *dev, char *name, int autof, int trustworthy,
 			make_parts(devname, parts);
 
 		if (strcmp(chosen, devname) != 0) {
-			if (mkdir("/dev/md",0700) == 0) {
-				if (chown("/dev/md", ci->uid, ci->gid))
-					perror("chown /dev/md");
-				if (chmod("/dev/md", ci->mode| ((ci->mode>>2) & 0111)))
-					perror("chmod /dev/md");
+			if (mkdir(DEV_NUM_PREF, 0700) == 0) {
+				if (chown(DEV_NUM_PREF, ci->uid, ci->gid))
+					perror("chown " DEV_NUM_PREF);
+				if (chmod(DEV_NUM_PREF, ci->mode | ((ci->mode >> 2) & 0111)))
+					perror("chmod " DEV_NUM_PREF);
 			}
 
 			if (dev && strcmp(chosen, dev) == 0)