include/block/block_int: Document protocol related functions
Clarify that: - for protocols the brdv_file_open function is used instead of bdrv_open; - when protocol_name is set, a driver should expect to be given only a filename and no other options. Signed-off-by: NFabiano Rosas <farosas@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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