Re: [PATCH v2 6/7] NFS: direct-io: convert to FOLL_PIN pages

[John Hubbard]

On 9/5/22 23:49, Christoph Hellwig wrote:
> On Tue, Aug 30, 2022 at 09:18:42PM -0700, John Hubbard wrote:
> static void nfs_direct_release_pages(struct iov_iter *iter, struct page **pages,
> 				     unsigned int npages)
>>  {
>> -	unsigned int i;
>> -	for (i = 0; i < npages; i++)
>> -		put_page(pages[i]);
>> +	if (user_backed_iter(iter) || iov_iter_is_bvec(iter))
>> +		dio_w_unpin_user_pages(pages, npages);
>> +	else
>> +		release_pages(pages, npages);
> 
> Instead of having this magic in all kinds of places, we need a helper
> that takes the page array, npages and iter->type and does the right
> thing.

Yes, Miklos asked for much the same thing, too. :)

thanks,

-- 
John Hubbard
NVIDIA