xen/blkfront: Add the CDROM_GET_CAPABILITY ioctl to blkfront.

Return 0 instead of -EINVAL if the blkfront device is a cdrom,
i.e. had the VDISK_CDROM attribute.  This allows udev's cdrom_id
to correctly detect the device as a cdrom device.

[ Add blkif_ioctl, and CDROMMULTISESSION ]

[ linux-2.6.18-xen changeset d2bd9af846b5 ]

Signed-off-by: Christian Limpach <Christian.Limpach@xensource.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index e8d3bf6f3918..da3fee6bf530 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -38,6 +38,7 @@
 #include <linux/interrupt.h>
 #include <linux/blkdev.h>
 #include <linux/hdreg.h>
+#include <linux/cdrom.h>
 #include <linux/module.h>
 
 #include <xen/xenbus.h>
@@ -153,6 +154,40 @@ static int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)
         return 0;
 }
 
+int blkif_ioctl(struct inode *inode, struct file *filep,
+                unsigned command, unsigned long argument)
+{
+        struct blkfront_info *info =
+                inode->i_bdev->bd_disk->private_data;
+        int i;
+
+        dev_dbg(&info->xbdev->dev, "command: 0x%x, argument: 0x%lx\n",
+                command, (long)argument);
+
+        switch (command) {
+        case CDROMMULTISESSION:
+                dev_dbg(&info->xbdev->dev, "FIXME: support multisession CDs later\n");
+                for (i = 0; i < sizeof(struct cdrom_multisession); i++)
+                        if (put_user(0, (char __user *)(argument + i)))
+                                return -EFAULT;
+                return 0;
+
+        case CDROM_GET_CAPABILITY: {
+                struct gendisk *gd = info->gd;
+                if (gd->flags & GENHD_FL_CD)
+                        return 0;
+                return -EINVAL;
+        }
+
+        default:
+                /*printk(KERN_ALERT "ioctl %08x not supported by Xen blkdev\n",
+                  command);*/
+                return -EINVAL; /* same return as native Linux */
+        }
+
+        return 0;
+}
+
 /*
  * blkif_queue_request
  *
@@ -974,6 +1009,7 @@ static struct block_device_operations xlvbd_block_fops =
         .open = blkif_open,
         .release = blkif_release,
         .getgeo = blkif_getgeo,
+        .ioctl = blkif_ioctl,
 };