block/parallels: replace some magic numbers

Signed-off-by: NKlim Kireev <klim.kireev@virtuozzo.com>
Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: NEdgar Kaziakhmedov <edgar.kaziakhmedov@virtuozzo.com>
Message-id: 20180112090122.1702-5-klim.kireev@virtuozzo.com
CC: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

block/parallels.c

@@ -476,8 +476,9 @@ static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
     memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
     header.version = cpu_to_le32(HEADER_VERSION);
     /* don't care much about geometry, it is not used on image level */
-    header.heads = cpu_to_le32(16);
-    header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
+    header.heads = cpu_to_le32(HEADS_NUMBER);
+    header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE
+                                   / HEADS_NUMBER / SEC_IN_CYL);
     header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
     header.bat_entries = cpu_to_le32(bat_entries);
     header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));

block/parallels.h

@@ -34,6 +34,8 @@
 #include "qemu/coroutine.h"
 #include "qemu/typedefs.h"
 
+#define HEADS_NUMBER 16
+#define SEC_IN_CYL 32
 #define DEFAULT_CLUSTER_SIZE 1048576        /* 1 MiB */
 
 /* always little-endian */