tree ed30613055c350d84000cd205b35bd6ffc441054
parent 2a32c6e82ed24d837ce7af346ffc93113f0164b5
author John Snow <jsnow@redhat.com> 1500338062 -0400
committer Kevin Wolf <kwolf@redhat.com> 1500384457 +0200

qemu-img: Check for backing image if specified during create

Or, rather, force the open of a backing image if one was specified
for creation. Using a similar -unsafe option as rebase, allow qemu-img
to ignore the backing file validation if possible.

It may not always be possible, as in the existing case when a filesize
for the new image was not specified.

This is accomplished by shifting around the conditionals in
bdrv_img_create, such that a backing file is always opened unless we
provide BDRV_O_NO_BACKING. qemu-img is adjusted to pass this new flag
when -u is provided to create.

Sorry for the heinous looking diffstat, but it's mostly whitespace.

Inspired by: https://bugzilla.redhat.com/show_bug.cgi?id=1213786

Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>