Re: [PATCH 1/2] iov: introduce ITER_BVEC_FLAG_FIXED

[Pavel Begunkov]

On 09/12/2020 18:24, Matthew Wilcox wrote:
> On Wed, Dec 09, 2020 at 05:55:53PM +0000, Christoph Hellwig wrote:
>> On Wed, Dec 09, 2020 at 01:37:05PM +0000, Pavel Begunkov wrote:
>>> Yeah, I had troubles to put comments around, and it's still open.
>>>
>>> For current cases it can be bound to kiocb, e.g. "if an bvec iter passed
>>> "together" with kiocb then the vector should stay intact up to 
>>> ->ki_complete()". But that "together" is rather full of holes.
>>
>> What about: "For bvec based iters the bvec must not be freed until the
>> I/O has completed.  For asynchronous I/O that means it must be freed
>> no earlier than from ->ki_complete."
> 
> Perhaps for the second sentence "If the I/O is completed asynchronously,
> the bvec must not be freed before ->ki_complete() has been called"?

Sounds good, I'll use it. Thanks!

-- 
Pavel Begunkov