X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fblock%2Fioctl.c;h=6d7bcc9da9e72f806d0c3fe77aacca8c1ec896e3;hb=8e8ece46a861c84343256819eaec77e608ff9217;hp=43ff0c6ed90067ac678032d2170ea8092ed6380d;hpb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;p=linux-2.6.git

diff --git a/drivers/block/ioctl.c b/drivers/block/ioctl.c
index 43ff0c6ed..6d7bcc9da 100644
--- a/drivers/block/ioctl.c
+++ b/drivers/block/ioctl.c
@@ -3,6 +3,7 @@
 #include <linux/blkpg.h>
 #include <linux/backing-dev.h>
 #include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
@@ -220,3 +221,21 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
 	}
 	return -ENOTTY;
 }
+
+/* Most of the generic ioctls are handled in the normal fallback path.
+   This assumes the blkdev's low level compat_ioctl always returns
+   ENOIOCTLCMD for unknown ioctls. */
+long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+	struct block_device *bdev = file->f_dentry->d_inode->i_bdev;
+	struct gendisk *disk = bdev->bd_disk;
+	int ret = -ENOIOCTLCMD;
+	if (disk->fops->compat_ioctl) {
+		lock_kernel();
+		ret = disk->fops->compat_ioctl(file, cmd, arg);
+		unlock_kernel();
+	}
+	return ret;
+}
+
+EXPORT_SYMBOL_GPL(blkdev_ioctl);