[PATCH v7 4/8] parallels: Add data_start field to BDRVParallelsState

[Alexander Ivanov <alexander.ivanov@virtuozzo.com>]

In the next patch we will need the offset of the data area for host cluster
index calculation. Add this field and setting up code.

Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
 block/parallels.c | 7 ++++---
 block/parallels.h | 1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index 3cff25e3a4..374c9d17eb 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -864,10 +864,11 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
         ret = -ENOMEM;
         goto fail;
     }
-    s->data_end = le32_to_cpu(ph.data_off);
-    if (s->data_end == 0) {
-        s->data_end = DIV_ROUND_UP(size, BDRV_SECTOR_SIZE);
+    s->data_start = le32_to_cpu(ph.data_off);
+    if (s->data_start == 0) {
+        s->data_start = DIV_ROUND_UP(size, BDRV_SECTOR_SIZE);
     }
+    s->data_end = s->data_start;
     if (s->data_end < (s->header_size >> BDRV_SECTOR_BITS)) {
         /* there is not enough unused space to fit to block align between BAT
            and actual data. We can't avoid read-modify-write... */
diff --git a/block/parallels.h b/block/parallels.h
index f22f43f988..4e53e9572d 100644
--- a/block/parallels.h
+++ b/block/parallels.h
@@ -75,6 +75,7 @@ typedef struct BDRVParallelsState {
     uint32_t *bat_bitmap;
     unsigned int bat_size;
 
+    int64_t  data_start;
     int64_t  data_end;
     uint64_t prealloc_size;
     ParallelsPreallocMode prealloc_mode;
-- 
2.34.1