src/shifter_core.c: respect cache block size

Author: maxim-belkin

src/shifter_core.c

@@ -1612,7 +1612,7 @@ int setupPerNodeCacheBackingStore(VolMapPerNodeCacheConfig *cache, const char *b
     args[0] = _strdup(udiConfig->ddPath);
     args[1] = _strdup("if=/dev/zero");
     args[2] = alloc_strgenf("of=%s", buffer);
-    args[3] = _strdup("bs=1");
+    args[3] = alloc_strgenf("bs=%lu", cache->blockSize);
     args[4] = _strdup("count=0");
     args[5] = alloc_strgenf("seek=%lu", cache->cacheSize);
     args[6] = NULL;