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-rw-r--r--block/qcow2.c2
-rw-r--r--block/qed.c2
-rw-r--r--block/vdi.c1
-rw-r--r--block/vhdx.c3
-rw-r--r--block/vpc.c1
5 files changed, 9 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 8e2b6c7548..41e454a2f1 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1893,6 +1893,8 @@ static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs)
static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
BDRVQcowState *s = bs->opaque;
+ bdi->unallocated_blocks_are_zero = true;
+ bdi->can_write_zeroes_with_unmap = (s->qcow_version >= 3);
bdi->cluster_size = s->cluster_size;
bdi->vm_state_offset = qcow2_vm_state_offset(s);
return 0;
diff --git a/block/qed.c b/block/qed.c
index adc2736dd7..59516a5704 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1475,6 +1475,8 @@ static int bdrv_qed_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
memset(bdi, 0, sizeof(*bdi));
bdi->cluster_size = s->header.cluster_size;
bdi->is_dirty = s->header.features & QED_F_NEED_CHECK;
+ bdi->unallocated_blocks_are_zero = true;
+ bdi->can_write_zeroes_with_unmap = true;
return 0;
}
diff --git a/block/vdi.c b/block/vdi.c
index b6ec0020dc..2d7490f173 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -331,6 +331,7 @@ static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
logout("\n");
bdi->cluster_size = s->block_size;
bdi->vm_state_offset = 0;
+ bdi->unallocated_blocks_are_zero = true;
return 0;
}
diff --git a/block/vhdx.c b/block/vhdx.c
index ed6fa53b87..67bbe103a1 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1049,6 +1049,9 @@ static int vhdx_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
bdi->cluster_size = s->block_size;
+ bdi->unallocated_blocks_are_zero =
+ (s->params.data_bits & VHDX_PARAMS_HAS_PARENT) == 0;
+
return 0;
}
diff --git a/block/vpc.c b/block/vpc.c
index 551876fef7..1d326cbf44 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -464,6 +464,7 @@ static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
bdi->cluster_size = s->block_size;
}
+ bdi->unallocated_blocks_are_zero = true;
return 0;
}