Create new md devices consistently

 Creating a new MD device with the name 'd-0' results in some
 unexpected behavior, since mdadm sees that '-0' is a
 non-negative integer and therefore makes a "partitionable"
 device (/dev/md_d0).  This is not the expected behavior,
 since the documentation mentions 'dN' several places, and a
 reboot brings it up as /dev/md/d-0.  Make this consistent
 by ensuring that the character immediately following 'd' is
 a digit during creation.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/mdopen.c b/mdopen.c
index 61eda812..24188df6 100644
--- a/mdopen.c
+++ b/mdopen.c
@@ -207,7 +207,10 @@ int create_mddev(char *dev, char *name, int autof, int trustworthy,
 			char *ep;
 			if (cname[0] == 'd')
 				sp++;
-			num = strtoul(sp, &ep, 10);
+			if (isdigit(sp[0]))
+				num = strtoul(sp, &ep, 10);
+			else
+				ep = sp;
 			if (ep == sp || *ep || num < 0)
 				num = -1;
 			else if (cname[0] == 'd')