Re: [PATCH] block: add bio_iov_iter_nvecs for figuring out nr_vecs
From: Christoph Hellwig <hch@infradead.org>
Date: 2020-12-01 13:46:29
Also in:
linux-fsdevel
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.