When finding a /dev name for a device, prefer shorter names

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>

2 files changed, 16 insertions, 7 deletions

diff --git a/ChangeLog b/ChangeLog
index e85b583..2d4b709 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -15,6 +15,7 @@ Changes Prior to 1.12.0 release
     -   Fix parsing of /dev/md/N in is_standard
     -   Fix rounding errors in human_size()
     -   Fix silly example in mdadm.conf-examples
+    -   When finding a /dev name for a device, prefer shorter names
 	
 Changes Prior to 1.11.0 release
     -   Fix embarassing bug which causes --add to always fail.
diff --git a/util.c b/util.c
index add88de..a7dc7c7 100644
--- a/util.c
+++ b/util.c
@@ -478,12 +478,15 @@ int add_dev(const char *name, const struct stat *stb, int flag)
 
 /*
  * Find a block device with the right major/minor number.
- * Avoid /dev/mdNN and /dev/md/dNN if possible
+ * If we find multiple names, choose the shortest.
+ * If we find a non-standard name, it is probably there
+ * deliberately so prefer it over a standard name.
+ * This applies only to names for MD devices.
  */
 char *map_dev(int major, int minor)
 {
 	struct devmap *p;
-	char *std = NULL;
+	char *std = NULL, *nonstd=NULL;
 	if (!devlist_ready) {
 #ifndef __dietlibc__
 		nftw("/dev", add_dev, 10, FTW_PHYS);
@@ -496,12 +499,17 @@ char *map_dev(int major, int minor)
 	for (p=devlist; p; p=p->next)
 		if (p->major == major &&
 		    p->minor == minor) {
-			if (is_standard(p->name, NULL))
-				std = p->name;
-			else
-				return p->name;
+			if (is_standard(p->name, NULL)) {
+				if (std == NULL ||
+				    strlen(p->name) < strlen(std))
+					std = p->name;
+			} else {
+				if (nonstd == NULL ||
+				    strlen(p->name) < strlen(nonstd))
+					nonstd = p->name;
+			}
 		}
-	return std;
+	return nonstd ? nonstd : std;
 }
 
 #endif