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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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3
block.c
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@ -1061,7 +1061,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
/* Get the required size from the image */
bs1 = bdrv_new("");
QINCREF(options);
ret = bdrv_open(bs1, filename, options, 0, drv, &local_err);
ret = bdrv_open(bs1, filename, options, BDRV_O_NO_BACKING,
drv, &local_err);
if (ret < 0) {
bdrv_unref(bs1);
goto fail;