from -ac / redhat
location of code moved upwards a bit

diff -urN 28rc1/drivers/cdrom/cdrom.c 28rc1_aac/drivers/cdrom/cdrom.c
--- 28rc1/drivers/cdrom/cdrom.c	2003-11-28 20:26:20.000000000 +0200
+++ 28rc1_aac/drivers/cdrom/cdrom.c	2004-10-24 00:58:09.000000000 +0300
@@ -465,6 +465,10 @@
 	if ((cdi = cdrom_find_device(dev)) == NULL)
 		return -ENODEV;
 
+	/* If the device is opened O_EXCL but there are other openers, return busy */
+	if ( (fp->f_flags & O_EXCL) && (cdi->use_count>0) )
+		return -EBUSY;
+
 	if ((fp->f_mode & FMODE_WRITE) && !CDROM_CAN(CDC_DVD_RAM))
 		return -EROFS;