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由 Eric Blake 提交于
Sheepdog already requires that if backing_file is present, that it be another sheepdog image (see sd_co_create). Meanwhile, we want to move towards always being explicit about the backing format for other drivers where it matters. So for convenience, make qemu-img create -F sheepdog work, while rejecting all other explicit formats (note that this is only for QemuOpts usage; there is no change to the QAPI to allow a format through -blockdev). Signed-off-by: NEric Blake <eblake@redhat.com> Message-Id: <20200706203954.341758-4-eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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