Re: [PATCH] block: add bio_iov_iter_nvecs for figuring out nr_vecs

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On Tue, Dec 01, 2020 at 01:36:22PM +0000, Pavel Begunkov wrote:
> Yeah, that's the idea, but also wanted to verify that callers don't
> free it while in use, or if that's not the case to make it conditional
> by adding a flag in iov_iter.
> 
> Can anybody vow right off the bat that all callers behave well?

Yes, this will need a careful audit, I'm not too sure offhand.  For the
io_uring case which is sortof the fast path the caller won't free them
unless we allow the buffer unregistration to race with I/O.



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