jeremy at goop
May 30, 2008, 4:50 PM
Post #1 of 4
(392 views)
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[PATCH 2 of 5] xn/blkfront: Add the CDROM_GET_CAPABILITY ioctl to blkfront
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From: Christian Limpach <Christian.Limpach [at] xensource>
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 [at] xensource>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge [at] citrix>
---
drivers/block/xen-blkfront.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
--- 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>
@@ -150,6 +151,40 @@
hg->cylinders = cylinders;
if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)
hg->cylinders = 0xffff;
+ 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;
}
@@ -974,6 +1009,7 @@
.open = blkif_open,
.release = blkif_release,
.getgeo = blkif_getgeo,
+ .ioctl = blkif_ioctl,
};
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