vmdk: Fix index_in_cluster calculation in vmdk_co_get_block_status

It has the similar issue with b1649fae49a8. Since the calculation
is repeated for a few times already, introduce a function so it can be
reused.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 61f0ed1d54601b91b8195c1a30d7046f83283b40)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/block/vmdk.c b/block/vmdk.c
index bd74050f21a7631372ce7a671432118a2e0f7758..49a332d55fabcb12648c72fdb1cf613d1a68a767 100644 (file)
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1248,6 +1248,17 @@ static VmdkExtent *find_extent(BDRVVmdkState *s,
     return NULL;
 }
 
+static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent,
+                                                  int64_t sector_num)
+{
+    uint64_t index_in_cluster, extent_begin_sector, extent_relative_sector_num;
+
+    extent_begin_sector = extent->end_sector - extent->sectors;
+    extent_relative_sector_num = sector_num - extent_begin_sector;
+    index_in_cluster = extent_relative_sector_num % extent->cluster_sectors;
+    return index_in_cluster;
+}
+
 static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors, int *pnum)
 {
@@ -1285,7 +1296,7 @@ static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
         break;
     }
 
-    index_in_cluster = sector_num % extent->cluster_sectors;
+    index_in_cluster = vmdk_find_index_in_cluster(extent, sector_num);
     n = extent->cluster_sectors - index_in_cluster;
     if (n > nb_sectors) {
         n = nb_sectors;