Add a helper to set unused areas in the used bitmap.
Signed-off-by: Alexander Ivanov <alexander.iva...@virtuozzo.com>
Reviewed-by: Denis V. Lunev <d...@openvz.org>
---
block/parallels.c | 18 ++++++++++++++++++
block/parallels.h | 2 ++
2 files changed, 20 insertions(+)
diff --git a/block/parallels.c b/block/parallels.c
index 4470519656..13726fb3d5 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -196,6 +196,24 @@ int parallels_mark_used(BlockDriverState *bs, unsigned
long *bitmap,
return 0;
}
+int parallels_mark_unused(BlockDriverState *bs, unsigned long *bitmap,
+ uint32_t bitmap_size, int64_t off, uint32_t count)
+{
+ BDRVParallelsState *s = bs->opaque;
+ uint32_t cluster_end, cluster_index = host_cluster_index(s, off);
+ unsigned long next_unused;
+ cluster_end = cluster_index + count;
+ if (cluster_end > bitmap_size) {
+ return -E2BIG;
+ }
+ next_unused = find_next_zero_bit(bitmap, cluster_end, cluster_index);
+ if (next_unused < cluster_end) {
+ 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
diff --git a/block/parallels.h b/block/parallels.h
index 68077416b1..02b857b4a4 100644
--- a/block/parallels.h
+++ b/block/parallels.h
@@ -92,6 +92,8 @@ typedef struct BDRVParallelsState {
int parallels_mark_used(BlockDriverState *bs, unsigned long *bitmap,
uint32_t bitmap_size, int64_t off, uint32_t count);
+int parallels_mark_unused(BlockDriverState *bs, unsigned long *bitmap,
+ uint32_t bitmap_size, int64_t off, uint32_t count);
int GRAPH_RDLOCK
parallels_read_format_extension(BlockDriverState *bs, int64_t ext_off,
--
2.40.1
