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.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/cdrom/cdrom.c

@@ -1172,6 +1172,7 @@ int cdrom_open(struct cdrom_device_info *cdi, fmode_t mode)
 			ret = 0;
 			cdi->media_written = 0;
 		}
+		cdi->opened_for_data = true;
 	}
 
 	if (ret)
@@ -1252,7 +1253,6 @@ static int check_for_audio_disc(struct cdrom_device_info *cdi,
 void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode)
 {
 	const struct cdrom_device_ops *cdo = cdi->ops;
-	int opened_for_data;
 
 	cd_dbg(CD_CLOSE, "entering cdrom_release\n");
 
@@ -1270,14 +1270,12 @@ void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode)
 		}
 	}
 
-	opened_for_data = !(cdi->options & CDO_USE_FFLAGS) ||
-		!(mode & FMODE_NDELAY);
-
 	cdo->release(cdi);
-	if (cdi->use_count == 0) {      /* last process that closes dev*/
-		if (opened_for_data &&
-		    cdi->options & CDO_AUTO_EJECT && CDROM_CAN(CDC_OPEN_TRAY))
+
+	if (cdi->use_count == 0 && cdi->opened_for_data) {
+		if (cdi->options & CDO_AUTO_EJECT && CDROM_CAN(CDC_OPEN_TRAY))
 			cdo->tray_move(cdi, 1);
+		cdi->opened_for_data = false;
 	}
 }
 EXPORT_SYMBOL(cdrom_release);

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;
 };