[PATCH] add READ_BUFFER_CAPACITY as read-ok command

Patch is from Daniel Drake <dsd@gentoo.org>
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/block/scsi_ioctl.c

@@ -139,6 +139,7 @@ static int verify_command(struct file *file, unsigned char *cmd)
 		safe_for_read(GPCMD_PAUSE_RESUME),
 
 		/* CD/DVD data reading */
+		safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
 		safe_for_read(GPCMD_READ_CD),
 		safe_for_read(GPCMD_READ_CD_MSF),
 		safe_for_read(GPCMD_READ_DISC_INFO),

include/linux/cdrom.h

@@ -452,6 +452,7 @@ struct cdrom_generic_command
 #define GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL  0x1e
 #define GPCMD_READ_10			    0x28
 #define GPCMD_READ_12			    0xa8
+#define GPCMD_READ_BUFFER_CAPACITY	    0x5c
 #define GPCMD_READ_CDVD_CAPACITY	    0x25
 #define GPCMD_READ_CD			    0xbe
 #define GPCMD_READ_CD_MSF		    0xb9