Add a helper to set unused areas in used bitmap.
Signed-off-by: Alexander Ivanov <alexander.iva...@virtuozzo.com>
---
block/parallels.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/block/parallels.c b/block/parallels.c
index d5b333d5a4..b5e19ff921 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -195,6 +195,23 @@ static int mark_used(BlockDriverState *bs, unsigned long
*bitmap,
return 0;
}
+static int mark_unused(BlockDriverState *bs, unsigned long *bitmap,
+ uint32_t bitmap_size, int64_t off, uint32_t count)
+{
+ BDRVParallelsState *s = bs->opaque;
+ uint32_t cluster_index = host_cluster_index(s, off);
+ unsigned long next_unused;
+ if (cluster_index + count > bitmap_size) {
+ return -E2BIG;
+ }
+ next_unused = find_next_zero_bit(bitmap, bitmap_size, cluster_index);
+ if (next_unused < cluster_index + count) {
+ return -EINVAL;
+ }
+ bitmap_clear(bitmap, cluster_index, count);
+ return 0;
+}
+
/*
* Collect used bitmap. The image can contain errors, we should fill the
* bitmap anyway, as much as we can. This information will be used for
--
2.34.1
