On an image closing there can be unused clusters in the end of the image.
Truncate these clusters and update data_end field.
Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
block/parallels.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/block/parallels.c b/block/parallels.c
index fb7bc5e555..136865d53e 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -1454,6 +1454,23 @@ fail:
return ret;
}
+static int GRAPH_RDLOCK parallels_truncate_unused_clusters(BlockDriverState *bs)
+{
+ BDRVParallelsState *s = bs->opaque;
+ uint64_t end_off = 0;
+ if (s->used_bmap_size > 0) {
+ end_off = find_last_bit(s->used_bmap, s->used_bmap_size);
+ if (end_off == s->used_bmap_size) {
+ end_off = 0;
+ } else {
+ end_off = (end_off + 1) * s->cluster_size;
+ }
+ }
+ end_off += s->data_start * BDRV_SECTOR_SIZE;
+ s->data_end = end_off / BDRV_SECTOR_SIZE;
+ return bdrv_truncate(bs->file, end_off, true, PREALLOC_MODE_OFF, 0, NULL);
+}
+
static int GRAPH_RDLOCK parallels_inactivate(BlockDriverState *bs)
{
BDRVParallelsState *s = bs->opaque;
@@ -1471,8 +1488,7 @@ static int GRAPH_RDLOCK
parallels_inactivate(BlockDriverState *bs)
parallels_update_header(bs);
/* errors are ignored, so we might as well pass exact=true */
- ret = bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS,
- true, PREALLOC_MODE_OFF, 0, NULL);
+ ret = parallels_truncate_unused_clusters(bs);
if (ret < 0) {
error_report("Failed to truncate image: %s", strerror(-ret));
}