block: Make find_image_format() return 'raw' BlockDriver for SG_IO devices
This patch adds a special BlockDriverState->sg check in block.c:find_image_format() after bdrv_file_open() -> block/raw-posix.c:hdev_open() has been called to determine if we are dealing with a Linux host scsi-generic device. The patch then returns the BlockDriver * from bdrv_find_format("raw"), skipping the subsequent bdrv_read() and rest of find_image_format(). Signed-off-by: NNicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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