cdrom: move shared static to cdrom_device_info

The keeplocked variable in the cdrom driver is shared across multiple
drives, but set in per-device ioctls. Move it to the per-device struct,
avoiding that the setting on one drive affects the driver's behavior
when closing another.

[ Impact: limit udev's confusion to one drive when a CD burning program
unlocks the CD door at the end of burning. ]

Signed-off-by: Paolo Bonzini <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/cdrom/cdrom.c

···
 
 /* used to tell the module to turn on full debugging messages */
 static bool debug;
-/* used to keep tray locked at all times */
-static int keeplocked;
 /* default compatibility mode */
 static bool autoclose=1;
 static bool autoeject;
···
 		cdinfo(CD_CLOSE, "Use count for \"/dev/%s\" now zero\n", cdi->name);
 		cdrom_dvd_rw_close_write(cdi);
 
-		if ((cdo->capability & CDC_LOCK) && !keeplocked) {
+		if ((cdo->capability & CDC_LOCK) && !cdi->keeplocked) {
 			cdinfo(CD_CLOSE, "Unlocking door!\n");
 			cdo->lock_door(cdi, 0);
 		}
···
 	curslot = info->hdr.curslot;
 	kfree(info);
 
-	if (cdi->use_count > 1 || keeplocked) {
+	if (cdi->use_count > 1 || cdi->keeplocked) {
 		if (slot == CDSL_CURRENT) {
 	    		return curslot;
 		} else {
···
 
 	if (!CDROM_CAN(CDC_OPEN_TRAY))
 		return -ENOSYS;
-	if (cdi->use_count != 1 || keeplocked)
+	if (cdi->use_count != 1 || cdi->keeplocked)
 		return -EBUSY;
 	if (CDROM_CAN(CDC_LOCK)) {
 		int ret = cdi->ops->lock_door(cdi, 0);
···
 
 	if (!CDROM_CAN(CDC_OPEN_TRAY))
 		return -ENOSYS;
-	if (keeplocked)
+	if (cdi->keeplocked)
 		return -EBUSY;
 
 	cdi->options &= ~(CDO_AUTO_CLOSE | CDO_AUTO_EJECT);
···
 	if (!CDROM_CAN(CDC_LOCK))
 		return -EDRIVE_CANT_DO_THIS;
 
-	keeplocked = arg ? 1 : 0;
+	cdi->keeplocked = arg ? 1 : 0;
 
 	/*
 	 * Don't unlock the door on multiple opens by default, but allow

include/linux/cdrom.h

···
     	char name[20];                  /* name of the device type */
 /* per-device flags */
         __u8 sanyo_slot		: 2;	/* Sanyo 3 CD changer support */
-        __u8 reserved		: 6;	/* not used yet */
+        __u8 keeplocked		: 1;	/* CDROM_LOCKDOOR status */
+        __u8 reserved		: 5;	/* not used yet */
 	int cdda_method;		/* see flags */
 	__u8 last_sense;
 	__u8 media_written;		/* dirty flag, DVD+RW bookkeeping */