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[Qemu-commits] [COMMIT d032044] qmu-img: fix qemu-img convert to genera
From: |
Anthony Liguori |
Subject: |
[Qemu-commits] [COMMIT d032044] qmu-img: fix qemu-img convert to generate a validimage when the source referenced a backing file |
Date: |
Wed, 22 Jul 2009 16:26:29 -0000 |
From: Akkarit Sangpetch <address@hidden>
Make 'qemu-img convert' copies unallocated parts of the source image
when -B option was not specified.
Signed-off-by: Akkarit Sangpetch <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>
diff --git a/qemu-img.c b/qemu-img.c
index d806cfa..070fe2e 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;
}
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