oracleasm: Implement support for QUERY HANDLE operation

oracleasm: Implement support for QUERY HANDLE operation

ASMLib previously relied on tagging the disk handle pointer to store
the integrity format. This had the advantage that a simple masking
operation was all that was required to get from a handle to the
integrity information.

However, we have seen a few cases where it appears the disk handle has
been corrupted in userland post discovery. Consequently, it has proven
necessary to be able to query disk properties without relying on the
disk pointer tag.

The oracleasm driver currently only supports looking up disk by their
label string via the query_disk operation.  Implement a query_handle
operation that is similar to query_disk in that it returns all known
disk properties. However, the lookup is done by disk handle instead of
device node. Otherwise the two queries are identical.

Adding the new operation to oracleasm does not prevent older versions
of the library from working correctly. The old tagging mechanism is
still in place, the use of query_handle is entirely optional. Later
ASMLib versions will use the new mode of operation if the query_handle
transaction file appears in /dev/oracleasm.

Orabug: 28650922

Reviewed-by: Sajid Zia <sajid.zia@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Rajan Shanmugavelu <rajan.shanmugavelu@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>