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qemu-img: Fix qemu-img convert -obacking_file

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The old -B option caused a backing file to be used for the converted image and
to avoid copying clusters from the old backing file. When replaced with
-obacking_file, qemu-img convert does assign the backing file to the new image,
but it doesn't realize that it should avoid copying clusters from the backing
file.

This patch checks the -o options for a backing_file and applies the same logic
as for -B in this case.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2010-10-14 15:46:04 +02:00
parent a77cffe7e9
commit a18953fbe7
1 changed files with 7 additions and 0 deletions
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7
qemu-img.c
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@ -645,6 +645,7 @@ static int img_convert(int argc, char **argv)
const uint8_t *buf1;
BlockDriverInfo bdi;
QEMUOptionParameter *param = NULL, *create_options = NULL;
QEMUOptionParameter *out_baseimg_param;
char *options = NULL;
const char *snapshot_name = NULL;
@ -769,6 +770,12 @@ static int img_convert(int argc, char **argv)
goto out;
}
/* Get backing file name if -o backing_file was used */
out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
if (out_baseimg_param) {
out_baseimg = out_baseimg_param->value.s;
}
/* Check if compression is supported */
if (flags & BLOCK_FLAG_COMPRESS) {
QEMUOptionParameter *encryption =