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block: Use BDRV_O_NO_BACKING where appropriate

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If you open an image temporarily just because you want to check its size
or get it flushed, there's no real reason to open the whole backing file
chain.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
This commit is contained in:
Kevin Wolf 2013-11-28 11:58:02 +01:00
parent f32f988c77
commit c9fbb99d41
3 changed files with 5 additions and 3 deletions
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2
block/vmdk.c
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@ -1690,7 +1690,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
}
if (backing_file) {
BlockDriverState *bs = bdrv_new("");
ret = bdrv_open(bs, backing_file, NULL, 0, NULL, errp);
ret = bdrv_open(bs, backing_file, NULL, BDRV_O_NO_BACKING, NULL, errp);
if (ret != 0) {
bdrv_unref(bs);
return ret;