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block/stream: Don't stream unbacked devices

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If a block device is unbacked, a streaming blockjob should immediately
finish instead of beginning to try to stream, then noticing the backing
file does not contain even the first sector (since it does not exist)
and then finishing normally.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2013-11-13 20:37:58 +01:00 committed by Kevin Wolf
parent 8582972227
commit f4a193e717
1 changed files with 5 additions and 0 deletions
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5
block/stream.c
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@ -88,6 +88,11 @@ static void coroutine_fn stream_run(void *opaque)
int n = 0;
void *buf;
if (!bs->backing_hd) {
block_job_completed(&s->common, 0);
return;
}
s->common.len = bdrv_getlength(bs);
if (s->common.len < 0) {
block_job_completed(&s->common, s->common.len);