On 3/3/25 23:01, Caleb Sander Mateos wrote:
...
+ /* pad iovec to the right */
+ iovec_off = io->vec.nr - uvec_segs;
+ iov = io->vec.iovec + iovec_off;
+ uvec = u64_to_user_ptr(rw->addr);
+ res = iovec_from_user(uvec, uvec_segs, uvec_segs, iov,
+ io_is_compat(req->ctx));
+ if (IS_ERR(res))
+ return PTR_ERR(res);
+
+ ret = io_import_reg_vec(ddir, &io->iter, req, &io->vec,
+ uvec_segs, iovec_off, 0);
So the iovecs are being imported at prep time rather than issue time?
I suppose since only user registered buffers are allowed and not
kernel bvecs, you aren't concerned about interactions with the ublk
It's a question of generic io_uring policy and has nothing
to do with ublk. Thinking about it in terms of a specific
user wouldn't be productive.
--
Pavel Begunkov
