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qmu-img: fix qemu-img convert to generate a valid image when the source referenced a backing file

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Make 'qemu-img convert' copies unallocated parts of the source image
when -B option was not specified.

Signed-off-by: Akkarit Sangpetch <asangpet@andrew.cmu.edu>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Akkarit Sangpetch 2009-07-17 10:02:15 +02:00 committed by Anthony Liguori
parent b171271a50
commit d032044fb9
1 changed files with 13 additions and 7 deletions
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20
qemu-img.c
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@ -747,14 +747,20 @@ static int img_convert(int argc, char **argv)
n = bs_offset + bs_sectors - sector_num; n = bs_offset + bs_sectors - sector_num;
if (strcmp(drv->format_name, "host_device")) { if (strcmp(drv->format_name, "host_device")) {
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, /* If the output image is being created as a copy on write image,
n, &n1)) { assume that sectors which are unallocated in the input image
sector_num += n1; are present in both the output's and input's base images (no
continue; 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 { } else {
n1 = n; n1 = n;
} }