block/parallels: add get_block_status

block/parallels: add get_block_status

Implement VFS method for get_block_status to Parallels format driver.

qemu_co_mutex_lock is not necessary yet (the driver is read-only) but
will be necessary very soon when write will be supported.

Signed-off-by: Roman Kagan <[email protected]>
Reviewed-by: Denis V. Lunev <[email protected]>
Signed-off-by: Denis V. Lunev <[email protected]>
Message-id: 1430207220[email protected]
CC: Kevin Wolf <[email protected]>
CC: Stefan Hajnoczi <[email protected]>
Signed-off-by: Stefan Hajnoczi <[email protected]>