add-cow file can't live alone, must together will image_file and backing_file.
If we implement qemu-img convert operation for add-cow file format, we must
create image_file and backing_file manually, that will be confused for users,
so we just ignore add-cow format while doing converting.
Signed-off-by: Dong Xu Wang <wdon...@linux.vnet.ibm.com>
---
qemu-img.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index c8a70ff..0bce61c 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -756,6 +756,12 @@ static int img_convert(int argc, char **argv)
}
}
+ if (strcmp(out_fmt, "add-cow") == 0) {
+ error_report("Convert operation does not support %s format.", out_fmt);
+ ret = -1;
+ goto out;
+ }
+
/* Find driver and parse its options */
drv = bdrv_find_format(out_fmt);
if (!drv) {
--
1.7.1
