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io_uring: use iter_ubuf for single range imports 

This is more efficient than iter_iov.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
[merge to 6.2, minor fixes]
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jens Axboe 2023-01-05 11:07:32 -08:00
parent 4b61152e10
commit 1e23db450c
1 changed files with 6 additions and 3 deletions
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9
io_uring/rw.c
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@ -391,7 +391,7 @@ static struct iovec *__io_import_iovec(int ddir, struct io_kiocb *req,
rw->len = sqe_len;
}
ret = import_single_range(ddir, buf, sqe_len, s->fast_iov, iter);
ret = import_ubuf(ddir, buf, sqe_len, iter);
if (ret)
return ERR_PTR(ret);
return NULL;
@ -450,7 +450,10 @@ static ssize_t loop_rw_iter(int ddir, struct io_rw *rw, struct iov_iter *iter)
struct iovec iovec;
ssize_t nr;
if (!iov_iter_is_bvec(iter)) {
if (iter_is_ubuf(iter)) {
iovec.iov_base = iter->ubuf + iter->iov_offset;
iovec.iov_len = iov_iter_count(iter);
} else if (!iov_iter_is_bvec(iter)) {
iovec = iov_iter_iovec(iter);
} else {
iovec.iov_base = u64_to_user_ptr(rw->addr);
@ -495,7 +498,7 @@ static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
io->free_iovec = iovec;
io->bytes_done = 0;
/* can only be fixed buffers, no need to do anything */
if (iov_iter_is_bvec(iter))
if (iov_iter_is_bvec(iter) || iter_is_ubuf(iter))
return;
if (!iovec) {
unsigned iov_off = 0;