Signed-off-by: Peter Lieven <p...@kamp.de>
---
qemu-img.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index 809b4f1..5aa53ab 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1513,9 +1513,13 @@ static int img_convert(int argc, char **argv)
If the output is to a host device, we also write out
sectors that are entirely 0, since whatever data was
already there is garbage, not 0s. */
- if (!has_zero_init || out_baseimg ||
- is_allocated_sectors_min(buf1, n, &n1, min_sparse)) {
- ret = bdrv_write(out_bs, sector_num, buf1, n1);
+ int allocated = is_allocated_sectors_min(buf1, n, &n1,
min_sparse);
+ if (!has_zero_init || out_baseimg || allocated) {
+ if (allocated || out_baseimg) {
+ ret = bdrv_write(out_bs, sector_num, buf1, n1);
+ } else {
+ ret = bdrv_write_zeroes(out_bs, sector_num, n1);
+ }
if (ret < 0) {
error_report("error while writing sector %" PRId64
": %s", sector_num, strerror(-ret));
--
1.7.9.5
