"Darrick J. Wong" <djwong@xxxxxxxxxx> wrote:
>
> The attached patch implements a simple ioctl handler that supplies a
> compatible geometry when HDIO_GETGEO is called against a device-mapper
> device.
block_device_operations now has a standalone `getgeo' method.
> ...
> +static int dm_blk_ioctl(struct inode * inode, struct file * filp,
> + unsigned int cmd, unsigned long arg)
> +{
> + struct block_device *bdev = inode->i_bdev;
> + struct hd_geometry __user *loc = (void __user *)arg;
> + struct mapped_device *md;
> + int diskinfo[4];
> +
> + if (cmd == HDIO_GETGEO) {
> + if (!arg)
> + return -EINVAL;
I don't think we need that check? The -EFAULT should suffice.
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