diff options
| -rw-r--r-- | qemu-img.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/qemu-img.c b/qemu-img.c index d806cfa193..070fe2e229 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -747,14 +747,20 @@ static int img_convert(int argc, char **argv) n = bs_offset + bs_sectors - sector_num; if (strcmp(drv->format_name, "host_device")) { - if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, - n, &n1)) { - sector_num += n1; - continue; + /* If the output image is being created as a copy on write image, + assume that sectors which are unallocated in the input image + are present in both the output's and input's base images (no + need to copy them). */ + if (out_baseimg) { + if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, + n, &n1)) { + sector_num += n1; + continue; + } + /* The next 'n1' sectors are allocated in the input image. Copy + only those as they may be followed by unallocated sectors. */ + n = n1; } - /* The next 'n1' sectors are allocated in the input image. Copy - only those as they may be followed by unallocated sectors. */ - n = n1; } else { n1 = n; } |