cdrom: track if a cdrom_device_info was opened for data

Set a flag when a cdrom_device_info is opened for writing, instead of
trying to figure out this at release time.  This will allow to eventually
remove the mode argument to the ->release block_device_operation as
nothing but the CDROM drivers uses that argument.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Phillip Potter <phil@philpotter.co.uk>
Acked-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20230608110258.189493-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/cdrom.h

@@ -63,6 +63,7 @@ struct cdrom_device_info {
 	unsigned short mmc3_profile;	/* current MMC3 profile */
 	int (*exit)(struct cdrom_device_info *);
 	int mrw_mode_page;
+	bool opened_for_data;
 	__s64 last_media_change_ms;
 };