On Thu, Nov 6, 2008 at 12:32 PM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> On Thu, Nov 06, 2008 at 09:06:36AM -0500, J.R. Mauro wrote:
>> static int poch_ioctl(struct inode *inode, struct file *filp,
>> unsigned int cmd, unsigned long arg)
>> {
>> /* ---snip---*/
>> case POCH_IOC_SYNC_GROUP_FOR_USER:
>> case POCH_IOC_SYNC_GROUP_FOR_DEVICE:
>> vms = find_vma(current->mm, arg);
>> if (!vms)
>> /* Address not mapped. */
>> return -EINVAL;
>> if (vms->vm_file != filp)
>> /* Address mapped from different device/file. */
>> return -EINVAL;
>>
>> flush_cache_range(vms, arg, arg + channel->group_size);
>
> This doesn't look like something a driver should ever do. Could someone
> explain what it's trying to do from a high level point of view?
>
>
CC'd driver maintainers mentioned in the README
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