On 01/12/2020 13:45, Christoph Hellwig wrote: > 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. For registered bufs io_uring waits for such requests to complete first, so it's fine. -- Pavel Begunkov
