Re: [PATCH v2 2/3] block: Add support to warn on backing file change without format

For now, this is a mechanical addition; all callers pass false. But the next patch will use it to improve 'qemu-img rebase -u' when selecting a backing file with no format. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- include/block/block.h | 4 ++-- block.c | 13 ++++++++++--- block/qcow2.c | 2 +- block/stream.c | 2 +- blockdev.c | 3 ++- qemu-img.c | 4 ++-- 6 files changed, 18 insertions(+), 10 deletions(-)