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vmdk: Add vmdk_find_offset_in_cluster()

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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>
This commit is contained in:
Kevin Wolf 2016-04-25 17:14:48 +02:00
parent fde9d56f5b
commit a844a2b0d4
1 changed files with 17 additions and 6 deletions
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23
block/vmdk.c
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@ -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,