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authorKevin Wolf <kwolf@redhat.com>2016-04-25 17:14:48 +0200
committerKevin Wolf <kwolf@redhat.com>2016-05-12 15:22:08 +0200
commita844a2b0d4d11a9108c12caabb9a3eed265bf750 (patch)
tree009a470f1e094e048ad354e7d4681b25a9636e26 /block/vmdk.c
parentfde9d56f5bf238bb126d9ddcf316083c40e6be28 (diff)
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vmdk: Add vmdk_find_offset_in_cluster()
This is a byte granularity version of vmdk_find_index_in_cluster(). Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com>
Diffstat (limited to 'block/vmdk.c')
-rw-r--r--block/vmdk.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/block/vmdk.c b/block/vmdk.c
index 45f9d3c..f1e01f9 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1259,15 +1259,26 @@ static VmdkExtent *find_extent(BDRVVmdkState *s,
return NULL;
}
+static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
+ int64_t offset)
+{
+ uint64_t offset_in_cluster, extent_begin_offset, extent_relative_offset;
+ uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
+
+ extent_begin_offset =
+ (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
+ extent_relative_offset = offset - extent_begin_offset;
+ offset_in_cluster = extent_relative_offset % cluster_size;
+
+ return offset_in_cluster;
+}
+
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;
+ uint64_t offset;
+ offset = vmdk_find_offset_in_cluster(extent, sector_num * BDRV_SECTOR_SIZE);
+ return offset / BDRV_SECTOR_SIZE;
}
static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,