Re: [PATCH 3/6] iov_iter: new iov_iter_pin_pages*() routines

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On 8/27/22 15:46, Al Viro wrote:
> On Sat, Aug 27, 2022 at 01:36:04AM -0700, John Hubbard wrote:
>> Provide two new wrapper routines that are intended for user space pages
>> only:
>>
>>     iov_iter_pin_pages()
>>     iov_iter_pin_pages_alloc()
>>
>> Internally, these routines call pin_user_pages_fast(), instead of
>> get_user_pages_fast().
>>
>> As always, callers must use unpin_user_pages() or a suitable FOLL_PIN
>> variant, to release the pages, if they actually were acquired via
>> pin_user_pages_fast().
>>
>> This is a prerequisite to converting bio/block layers over to use
>> pin_user_pages_fast().
> 
> You do realize that O_DIRECT on ITER_BVEC is possible, right?

I do now. But I didn't until you wrote this!

Any advice or ideas would be welcome here.


thanks,

-- 
John Hubbard
NVIDIA



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