block: Allow JSON filenames
If the filename given to bdrv_open() is prefixed with "json:", parse the rest as a JSON object and merge the result into the options QDict. If there are conflicts, the options QDict takes precedence. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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