Fix bugs related to raid10 and the new offset layout.

Need to mask of bits above the bottom 16 when calculating number of
copies.

ChangeLog

@@ -13,6 +13,7 @@ Changes Prior to this release
 	initramfs, but device doesn't yet exist in /dev.
     -   When --assemble --scan is run, if all arrays that could be found
 	have already been started, don't report an error.
+    -   Fix a couple of bugs related to raid10 and the new 'offset' layout.
 
 Changes Prior to 2.5.4 release
     -   When creating devices in /dev/md/ create matching symlinks

Create.c

@@ -363,7 +363,7 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 		 * which is array.size * raid_disks / ncopies;
 		 * .. but convert to sectors.
 		 */
-		int ncopies = (layout>>8) * (layout & 255);
+		int ncopies = ((layout>>8) & 255) * (layout & 255);
 		bitmapsize = (unsigned long long)size * raiddisks / ncopies * 2;
 /*		printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, size, raiddisks, ncopies);*/
 	} else

util.c

@@ -179,7 +179,7 @@ int enough(int level, int raid_disks, int layout,
 		/* This is the tricky one - we need to check
 		 * which actual disks are present.
 		 */
-		copies = (layout&255)* (layout>>8);
+		copies = (layout&255)* ((layout>>8) & 255);
 		first=0;
 		do {
 			/* there must be one of the 'copies' form 'first' */