typedef struct _mongoc_gridfs_file_t mongoc_gridfs_file_t;
This structure provides a MongoDB GridFS file abstraction. It provides several APIs.
readv, writev, seek, and tell.
General file metadata such as filename and length.
GridFS metadata such as md5, filename, content_type, aliases, metadata, chunk_size, and upload_date.
This sturcture is NOT thread-safe and should only be used from one thread at a time.