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io_uring: introduce io_prep_reg_iovec()

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iovecs that are turned into registered buffers are imported in a special
way with an offset, so that later we can do an in place translation. Add
a helper function taking care of it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/7de2ecb9ed5efc3c5cf320232236966da5ad4ccc.1741457480.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2025-03-08 18:21:15 +00:00
committed by Jens Axboe
parent 5027d02452
commit d291fb6520
4 changed files with 32 additions and 40 deletions
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21
io_uring/rw.c
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@@ -407,28 +407,9 @@ static int io_rw_prep_reg_vec(struct io_kiocb *req)
struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw);
struct io_async_rw *io = req->async_data;
const struct iovec __user *uvec;
size_t uvec_segs = rw->len;
struct iovec *iov;
int iovec_off, ret;
void *res;
if (uvec_segs > io->vec.nr) {
ret = io_vec_realloc(&io->vec, uvec_segs);
if (ret)
return ret;
req->flags |= REQ_F_NEED_CLEANUP;
}
/* 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);
req->flags |= REQ_F_IMPORT_BUFFER;
return 0;
return io_prep_reg_iovec(req, &io->vec, uvec, rw->len);
}
int io_prep_readv_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe)