block: Add functions for inheriting a BBRS
In order to open a BDS which inherits a BB's root state, blk_get_open_flags_from_root_state() is used to inquire the flags to be passed to bdrv_open(), and blk_apply_root_state() is used to apply the remaining state after the BDS has been opened. Signed-off-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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