block: Add driver methods to probe blocksizes and geometry
Introduce driver methods of defining disk blocksizes (physical and logical) and hard drive geometry. Methods are only implemented for "host_device". For "raw" devices driver calls child's method. For now geometry detection will only work for DASD devices. To check that a local check_for_dasd function was introduced. It calls BIODASDINFO2 ioctl and returns its rc. Blocksizes detection function will probe sizes for DASD devices. Signed-off-by: NEkaterina Tumanova <tumanova@linux.vnet.ibm.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Message-id: 1424087278-49393-4-git-send-email-tumanova@linux.vnet.ibm.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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