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} - bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED; - bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED; + bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | + (BDRV_REQ_FUA & + bs->file->bs->supported_write_flags & + s->test_file->bs->supported_write_flags); + bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | + ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) & + bs->file->bs->supported_zero_flags & + s->test_file->bs->supported_zero_flags); ret = 0; fail: