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block: Add support to warn on backing file change without format

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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@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Message-Id: <20200706203954.341758-10-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2020-07-06 15:39:53 -05:00 • committed by Kevin Wolf
parent b66ff2c298
commit e54ee1b385
6 changed files with 18 additions and 10 deletions
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3
blockdev.c
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@ -3416,7 +3416,8 @@ void qmp_change_backing_file(const char *device,
}
ret = bdrv_change_backing_file(image_bs, backing_file,
image_bs->drv ? image_bs->drv->format_name : "");
image_bs->drv ? image_bs->drv->format_name : "",
false);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not change backing file to '%s'",