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block: expect errors from bdrv_co_is_allocated

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Some bdrv_is_allocated callers do not expect errors, but the fallback
in qcow2.c might make other callers trip on assertion failures or
infinite loops.

Fix the callers to always look for errors.

Cc: qemu-stable@nongnu.org
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-09-04 19:00:25 +02:00 • committed by Stefan Hajnoczi
parent 4f5786376e
commit d663640c04
6 changed files with 30 additions and 9 deletions
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2
block/stream.c
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@ -124,7 +124,7 @@ wait:
if (ret == 1) {
/* Allocated in the top, no need to copy. */
copy = false;
} else {
} else if (ret >= 0) {
/* Copy if allocated in the intermediate images. Limit to the
* known-unallocated area [sector_num, sector_num+n). */
ret = bdrv_is_allocated_above(bs->backing_hd, base,